Fix compilation on recent clang.

Remove unused file.

.clang-format

@@ -1,5 +1,5 @@
 ---
-BasedOnStyle: LLVM
+BasedOnStyle: Google
 IndentWidth: 2
 TabWidth: 2
 UseTab: Never

.travis.yml

@@ -1,5 +1,5 @@
 language: cpp
-sudo: false
+sudo: required
 matrix:
   include:
   - addons: &1
@@ -36,21 +36,17 @@ matrix:
     env: COMPILER_VERSION=4.9 BUILD_TYPE=Release
   - addons: *1
     compiler: clang
-    env: COMPILER_VERSION=3.7 BUILD_TYPE=Debug CFLAGS="-O0 --coverage" CXXFLAGS="-O0
-      --coverage" REPORT_COVERAGE=1
+    env: COMPILER_VERSION=3.7 BUILD_TYPE=Debug
 before_install:
 - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew upgrade; fi
-- if [ -n "$REPORT_COVERAGE" ]; then pip install --user cpp-coveralls; fi
+- if [ -n "$REPORT_COVERAGE" ]; then sudo apt-get update python; fi
+- if [ -n "$REPORT_COVERAGE" ]; then sudo apt-get install python-dev libffi-dev libssl-dev; fi
+- if [ -n "$REPORT_COVERAGE" ]; then sudo pip install --upgrade pip; fi
+- if [ -n "$REPORT_COVERAGE" ]; then CXX=g++ pip install --user requests[security]; fi
+- if [ -n "$REPORT_COVERAGE" ]; then CXX=g++ pip install --user cpp-coveralls; fi
 script:
-- mkdir build && cd build
-- export CC="${CC}-${COMPILER_VERSION}"
-- export CXX="${CXX}-${COMPILER_VERSION}"
-- ${CC} -v
-- cmake --version
-- cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DTINYOBJLOADER_BUILD_TEST_LOADER=On -G Ninja
-  ..
-- ninja
-- ./test_loader ../cornell_box.obj
+- cd tests
+- make check
 - if [ -n "$REPORT_COVERAGE" ]; then coveralls -b . -r .. -e examples -e tools -e
   jni -e python -e images -E ".*CompilerId.*" -E ".*feature_tests.*" ; fi
 - cd ..

CMakeLists.txt

@@ -2,57 +2,145 @@
 #This configures the Cmake system with multiple properties, depending
 #on the platform and configuration it is set to build in.
 project(tinyobjloader)
-cmake_minimum_required(VERSION 2.8.6)
+cmake_minimum_required(VERSION 2.8.11)
+set(TINYOBJLOADER_SOVERSION 1)
+set(TINYOBJLOADER_VERSION 1.0.4)
+
+#optional double precision support
+option(TINYOBJLOADER_USE_DOUBLE "Build library with double precision instead of single (float)" OFF)
+
+if(TINYOBJLOADER_USE_DOUBLE)
+  add_definitions(-DTINYOBJLOADER_USE_DOUBLE)
+  set(LIBRARY_NAME ${PROJECT_NAME}_double)
+else()
+  set(LIBRARY_NAME ${PROJECT_NAME})
+endif()
+
 
 #Folder Shortcuts
 set(TINYOBJLOADEREXAMPLES_DIR ${CMAKE_CURRENT_SOURCE_DIR}/examples)
 
 set(tinyobjloader-Source
-	${CMAKE_CURRENT_SOURCE_DIR}/tiny_obj_loader.h
-	${CMAKE_CURRENT_SOURCE_DIR}/tiny_obj_loader.cc
-	)
+  ${CMAKE_CURRENT_SOURCE_DIR}/tiny_obj_loader.h
+  ${CMAKE_CURRENT_SOURCE_DIR}/tiny_obj_loader.cc
+  )
 
-set(tinyobjloader-Test-Source
-	${CMAKE_CURRENT_SOURCE_DIR}/test.cc
-	)
+set(tinyobjloader-Example-Source
+  ${CMAKE_CURRENT_SOURCE_DIR}/loader_example.cc
+  )
 
 set(tinyobjloader-examples-objsticher
-	${TINYOBJLOADEREXAMPLES_DIR}/obj_sticher/obj_writer.h
-	${TINYOBJLOADEREXAMPLES_DIR}/obj_sticher/obj_writer.cc
-	${TINYOBJLOADEREXAMPLES_DIR}/obj_sticher/obj_sticher.cc
-	)
+  ${TINYOBJLOADEREXAMPLES_DIR}/obj_sticher/obj_writer.h
+  ${TINYOBJLOADEREXAMPLES_DIR}/obj_sticher/obj_writer.cc
+  ${TINYOBJLOADEREXAMPLES_DIR}/obj_sticher/obj_sticher.cc
+  )
 
-add_library(tinyobjloader
-			${tinyobjloader-Source}
-	)
+#Install destinations
+include(GNUInstallDirs)
 
-option(TINYOBJLOADER_BUILD_TEST_LOADER "Build Test Loader Application" OFF)
+set(TINYOBJLOADER_CMAKE_DIR ${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME}/cmake)
+set(TINYOBJLOADER_DOC_DIR ${CMAKE_INSTALL_DOCDIR})
+set(TINYOBJLOADER_INCLUDE_DIR ${CMAKE_INSTALL_INCLUDEDIR})
+set(TINYOBJLOADER_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR})
+set(TINYOBJLOADER_PKGCONFIG_DIR ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+set(TINYOBJLOADER_RUNTIME_DIR ${CMAKE_INSTALL_BINDIR})
+
+option(TINYOBJLOADER_BUILD_TEST_LOADER "Build Example Loader Application" OFF)
+option(TINYOBJLOADER_COMPILATION_SHARED "Build as shared library" OFF)
+
+if(TINYOBJLOADER_COMPILATION_SHARED)
+  add_library(${LIBRARY_NAME} SHARED ${tinyobjloader-Source})
+  set_target_properties(${LIBRARY_NAME} PROPERTIES
+    SOVERSION ${TINYOBJLOADER_SOVERSION}
+  )
+else()
+  add_library(${LIBRARY_NAME} STATIC ${tinyobjloader-Source})
+endif()
+
+set_target_properties(${LIBRARY_NAME} PROPERTIES VERSION ${TINYOBJLOADER_VERSION})
+
+target_include_directories(${LIBRARY_NAME} INTERFACE
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+  $<INSTALL_INTERFACE:${TINYOBJLOADER_INCLUDE_DIR}>
+  )
+
+export(TARGETS ${LIBRARY_NAME} FILE ${PROJECT_NAME}-targets.cmake)
 
 if(TINYOBJLOADER_BUILD_TEST_LOADER)
-  add_executable(test_loader ${tinyobjloader-Test-Source})
-  target_link_libraries(test_loader tinyobjloader)
+  add_executable(test_loader ${tinyobjloader-Example-Source})
+  target_link_libraries(test_loader ${LIBRARY_NAME})
 endif()
 
 option(TINYOBJLOADER_BUILD_OBJ_STICHER "Build OBJ Sticher Application" OFF)
-if (TINYOBJLOADER_BUILD_OBJ_STICHER)
+if(TINYOBJLOADER_BUILD_OBJ_STICHER)
   add_executable(obj_sticher ${tinyobjloader-examples-objsticher})
-  target_link_libraries(obj_sticher tinyobjloader)
+  target_link_libraries(obj_sticher ${LIBRARY_NAME})
 
-  install ( TARGETS
+  install(TARGETS
     obj_sticher
     DESTINATION
-    bin
+    ${TINYOBJLOADER_RUNTIME_DIR}
     )
 endif()
 
-#Installation
-install ( TARGETS
-  tinyobjloader
-  DESTINATION
-  lib
+#Write CMake package config files
+include(CMakePackageConfigHelpers)
+
+configure_package_config_file(
+  ${PROJECT_NAME}-config.cmake.in
+  ${LIBRARY_NAME}-config.cmake
+  INSTALL_DESTINATION
+  ${TINYOBJLOADER_CMAKE_DIR}
+  PATH_VARS
+  TINYOBJLOADER_INCLUDE_DIR
+  TINYOBJLOADER_LIBRARY_DIR
+  NO_CHECK_REQUIRED_COMPONENTS_MACRO
   )
-install ( FILES
+
+write_basic_package_version_file(${LIBRARY_NAME}-config-version.cmake
+  VERSION
+  ${TINYOBJLOADER_VERSION}
+  COMPATIBILITY
+  SameMajorVersion
+  )
+
+#pkg-config file
+configure_file(${PROJECT_NAME}.pc.in ${LIBRARY_NAME}.pc @ONLY)
+
+#Installation
+install(TARGETS
+  ${LIBRARY_NAME}
+  EXPORT ${PROJECT_NAME}-targets
+  DESTINATION
+  ${TINYOBJLOADER_LIBRARY_DIR}
+  PUBLIC_HEADER DESTINATION
+  ${TINYOBJLOADER_INCLUDE_DIR}
+  RUNTIME DESTINATION
+  ${TINYOBJLOADER_RUNTIME_DIR}
+  )
+install(EXPORT
+  ${PROJECT_NAME}-targets
+  DESTINATION
+  ${TINYOBJLOADER_CMAKE_DIR}
+  )
+install(FILES
   tiny_obj_loader.h
   DESTINATION
-  include
+  ${TINYOBJLOADER_INCLUDE_DIR}
+  )
+install(FILES
+  LICENSE
+  DESTINATION
+  ${TINYOBJLOADER_DOC_DIR}
+  )
+install(FILES
+  "${CMAKE_CURRENT_BINARY_DIR}/${LIBRARY_NAME}-config.cmake"
+  "${CMAKE_CURRENT_BINARY_DIR}/${LIBRARY_NAME}-config-version.cmake"
+  DESTINATION
+  ${TINYOBJLOADER_CMAKE_DIR}
+  )
+install(FILES
+  "${CMAKE_CURRENT_BINARY_DIR}/${LIBRARY_NAME}.pc"
+  DESTINATION
+  ${TINYOBJLOADER_PKGCONFIG_DIR}
   )

LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2012-2016 Syoyo Fujita and many contributors.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

@@ -1,5 +1,4 @@
-tinyobjloader
-=============
+# tinyobjloader
 
 [![Join the chat at https://gitter.im/syoyo/tinyobjloader](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/syoyo/tinyobjloader?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
@@ -11,44 +10,71 @@ tinyobjloader
 
 [![Coverage Status](https://coveralls.io/repos/github/syoyo/tinyobjloader/badge.svg?branch=master)](https://coveralls.io/github/syoyo/tinyobjloader?branch=master)
 
-http://syoyo.github.io/tinyobjloader/
+[https://github.com/syoyo/tinyobjloader](https://github.com/syoyo/tinyobjloader)
 
-Tiny but powerful single file wavefront obj loader written in C++. No dependency except for C++ STL. It can parse 10M over polygons with moderate memory and time.
+Tiny but powerful single file wavefront obj loader written in C++. No dependency except for C++ STL. It can parse over 10M polygons with moderate memory and time.
 
 `tinyobjloader` is good for embedding .obj loader to your (global illumination) renderer ;-)
 
+If you are looking for C89 version, please see https://github.com/syoyo/tinyobjloader-c .
 
-What's new
-----------
-
-* Jan 29, 2016 : Support n-polygon(no triangulation) and OpenSubdiv crease tag! Thanks dboogert!
-* Nov 26, 2015 : Now single-header only!.
-* Nov 08, 2015 : Improved API.
-* Jun 23, 2015 : Various fixes and added more projects using tinyobjloader. Thanks many contributors!
-* Mar 03, 2015 : Replace atof() with hand-written parser for robust reading of numeric value. Thanks skurmedel!
-* Feb 06, 2015 : Fix parsing multi-material object
-* Sep 14, 2014 : Add support for multi-material per object/group. Thanks Mykhailo!
-* Mar 17, 2014 : Fixed trim newline bugs. Thanks ardneran!
-* Apr 29, 2014 : Add API to read .obj from std::istream. Good for reading compressed .obj or connecting to procedural primitive generator. Thanks burnse!
-* Apr 21, 2014 : Define default material if no material definition exists in .obj. Thanks YarmUI!
-* Apr 10, 2014 : Add support for parsing 'illum' and 'd'/'Tr' statements. Thanks mmp!
-* Jan 27, 2014 : Added CMake project. Thanks bradc6!
-* Nov 26, 2013 : Performance optimization by NeuralSandwich. 9% improvement in his project, thanks!
-* Sep 12, 2013 : Added multiple .obj sticher example.
-
-Example
+Notice!
 -------
 
-![Rungholt](https://github.com/syoyo/tinyobjloader/blob/master/images/rungholt.jpg?raw=true)
+We have released new version v1.0.0 on 20 Aug, 2016.
+Old version is available `v0.9.x` branch https://github.com/syoyo/tinyobjloader/tree/v0.9.x
+
+## What's new
+
+### Version 2.x
+
+* Refactor API
+* Support triangulation for concave polygons(#151)
+
+### Version 1.x
+
+Avaiable in `v1.x.y` branch.
+
+* 20 Aug, 2016 : Bump version v1.0.0. New data structure and API!
+
+### Older version
+
+Older version is avaiable in `v0.9.x` branch.
+
+## Example
+
+![Rungholt](images/rungholt.jpg)
 
 tinyobjloader can successfully load 6M triangles Rungholt scene.
-http://graphics.cs.williams.edu/data/meshes.xml
+http://casual-effects.com/data/index.html
 
-Use case
---------
+![](images/sanmugel.png) 
+
+* [examples/viewer/](examples/viewer) OpenGL .obj viewer 
+* [examples/callback_api/](examples/callback_api/) Callback API example 
+* [examples/voxelize/](examples/voxelize/) Voxelizer example 
+
+## Use case
 
 TinyObjLoader is successfully used in ...
 
+### New version(v2.x)
+
+* Your project here! (Letting us know via github issue is welcome!)
+
+### Old version(v1.x)
+
+* Double precision support through `TINYOBJLOADER_USE_DOUBLE` thanks to noma
+* Loading models in Vulkan Tutorial https://vulkan-tutorial.com/Loading_models
+* .obj viewer with Metal https://github.com/middlefeng/NuoModelViewer/tree/master
+* Vulkan Cookbook https://github.com/PacktPublishing/Vulkan-Cookbook
+* cudabox: CUDA Solid Voxelizer Engine https://github.com/gaspardzoss/cudavox
+* Drake: A planning, control, and analysis toolbox for nonlinear dynamical systems https://github.com/RobotLocomotion/drake
+* VFPR - a Vulkan Forward Plus Renderer : https://github.com/WindyDarian/Vulkan-Forward-Plus-Renderer
+* Your project here! (Letting us know via github issue is welcome!)
+
+### Older version(v0.9.x)
+
 * bullet3 https://github.com/erwincoumans/bullet3
 * pbrt-v2 https://github.com/mmp/pbrt-v2
 * OpenGL game engine development http://swarminglogic.com/jotting/2013_10_gamedev01
@@ -60,111 +86,141 @@ TinyObjLoader is successfully used in ...
 * pbrt-v3 https://github.com/mmp/pbrt-v3
 * cocos2d-x https://github.com/cocos2d/cocos2d-x/
 * Android Vulkan demo https://github.com/SaschaWillems/Vulkan
-* Your project here!
+* voxelizer https://github.com/karimnaaji/voxelizer
+* Probulator https://github.com/kayru/Probulator
+* OptiX Prime baking https://github.com/nvpro-samples/optix_prime_baking
+* FireRays SDK https://github.com/GPUOpen-LibrariesAndSDKs/FireRays_SDK
+* parg, tiny C library of various graphics utilities and GL demos https://github.com/prideout/parg
+* Opengl unit of ChronoEngine https://github.com/projectchrono/chrono-opengl
+* Point Based Global Illumination on modern GPU https://pbgi.wordpress.com/code-source/
+* Fast OBJ file importing and parsing in CUDA http://researchonline.jcu.edu.au/42515/1/2015.CVM.OBJCUDA.pdf
+* Sorted Shading for Uni-Directional Pathtracing by Joshua Bainbridge https://nccastaff.bournemouth.ac.uk/jmacey/MastersProjects/MSc15/02Josh/joshua_bainbridge_thesis.pdf
+* GeeXLab http://www.geeks3d.com/hacklab/20160531/geexlab-0-12-0-0-released-for-windows/
 
-Features
---------
+
+## Features
 
 * Group(parse multiple group name)
 * Vertex
+  * Vertex color(as an extension: https://blender.stackexchange.com/questions/31997/how-can-i-get-vertex-painted-obj-files-to-import-into-blender)
 * Texcoord
 * Normal
 * Material
   * Unknown material attributes are returned as key-value(value is string) map.
 * Crease tag('t'). This is OpenSubdiv specific(not in wavefront .obj specification)
+* PBR material extension for .MTL. Its proposed here: http://exocortex.com/blog/extending_wavefront_mtl_to_support_pbr
+* Callback API for custom loading.
+* Double precision support(for HPC application).
 
 
-TODO
-----
+## TODO
 
-* [ ] Support different indices for vertex/normal/texcoord
+* [ ] Fix obj_sticker example.
+* [ ] More unit test codes.
+* [x] Texture options
+* [ ] Normal vector generation
+  * [ ] Support smoothing groups
 
-License
--------
+## License
 
-Licensed under 2 clause BSD.
+Licensed under MIT license.
 
-Usage
------
+## Usage
 
-TinyObjLoader triangulate input .obj by default.
-```c++
-#define TINYOBJLOADER_IMPLEMENTATION // define this in only *one* .cc
-#include "tiny_obj_loader.h"
+### Data format
 
-std::string inputfile = "cornell_box.obj";
-std::vector<tinyobj::shape_t> shapes;
-std::vector<tinyobj::material_t> materials;
+`attrib_t` contains single and linear array of vertex data(position, normal and texcoord).
 
-std::string err;
-bool ret = tinyobj::LoadObj(shapes, materials, err, inputfile.c_str());
+```
+attrib_t::vertices => 3 floats per vertex
 
-if (!err.empty()) { // `err` may contain warning message.
-  std::cerr << err << std::endl;
-}
+       v[0]        v[1]        v[2]        v[3]               v[n-1]
+  +-----------+-----------+-----------+-----------+      +-----------+
+  | x | y | z | x | y | z | x | y | z | x | y | z | .... | x | y | z |
+  +-----------+-----------+-----------+-----------+      +-----------+
 
-if (!ret) {
-  exit(1);
-}
+attrib_t::normals => 3 floats per vertex
 
-std::cout << "# of shapes    : " << shapes.size() << std::endl;
-std::cout << "# of materials : " << materials.size() << std::endl;
+       n[0]        n[1]        n[2]        n[3]               n[n-1]
+  +-----------+-----------+-----------+-----------+      +-----------+
+  | x | y | z | x | y | z | x | y | z | x | y | z | .... | x | y | z |
+  +-----------+-----------+-----------+-----------+      +-----------+
 
-for (size_t i = 0; i < shapes.size(); i++) {
-  printf("shape[%ld].name = %s\n", i, shapes[i].name.c_str());
-  printf("Size of shape[%ld].indices: %ld\n", i, shapes[i].mesh.indices.size());
-  printf("Size of shape[%ld].material_ids: %ld\n", i, shapes[i].mesh.material_ids.size());
-  assert((shapes[i].mesh.indices.size() % 3) == 0);
-  for (size_t f = 0; f < shapes[i].mesh.indices.size() / 3; f++) {
-    printf("  idx[%ld] = %d, %d, %d. mat_id = %d\n", f, shapes[i].mesh.indices[3*f+0], shapes[i].mesh.indices[3*f+1], shapes[i].mesh.indices[3*f+2], shapes[i].mesh.material_ids[f]);
-  }
+attrib_t::texcoords => 2 floats per vertex
 
-  printf("shape[%ld].vertices: %ld\n", i, shapes[i].mesh.positions.size());
-  assert((shapes[i].mesh.positions.size() % 3) == 0);
-  for (size_t v = 0; v < shapes[i].mesh.positions.size() / 3; v++) {
-    printf("  v[%ld] = (%f, %f, %f)\n", v,
-      shapes[i].mesh.positions[3*v+0],
-      shapes[i].mesh.positions[3*v+1],
-      shapes[i].mesh.positions[3*v+2]);
-  }
-}
+       t[0]        t[1]        t[2]        t[3]               t[n-1]
+  +-----------+-----------+-----------+-----------+      +-----------+
+  |  u  |  v  |  u  |  v  |  u  |  v  |  u  |  v  | .... |  u  |  v  |
+  +-----------+-----------+-----------+-----------+      +-----------+
+
+attrib_t::colors => 3 floats per vertex(vertex color. optional)
+
+       c[0]        c[1]        c[2]        c[3]               c[n-1]
+  +-----------+-----------+-----------+-----------+      +-----------+
+  | x | y | z | x | y | z | x | y | z | x | y | z | .... | x | y | z |
+  +-----------+-----------+-----------+-----------+      +-----------+
 
-for (size_t i = 0; i < materials.size(); i++) {
-  printf("material[%ld].name = %s\n", i, materials[i].name.c_str());
-  printf("  material.Ka = (%f, %f ,%f)\n", materials[i].ambient[0], materials[i].ambient[1], materials[i].ambient[2]);
-  printf("  material.Kd = (%f, %f ,%f)\n", materials[i].diffuse[0], materials[i].diffuse[1], materials[i].diffuse[2]);
-  printf("  material.Ks = (%f, %f ,%f)\n", materials[i].specular[0], materials[i].specular[1], materials[i].specular[2]);
-  printf("  material.Tr = (%f, %f ,%f)\n", materials[i].transmittance[0], materials[i].transmittance[1], materials[i].transmittance[2]);
-  printf("  material.Ke = (%f, %f ,%f)\n", materials[i].emission[0], materials[i].emission[1], materials[i].emission[2]);
-  printf("  material.Ns = %f\n", materials[i].shininess);
-  printf("  material.Ni = %f\n", materials[i].ior);
-  printf("  material.dissolve = %f\n", materials[i].dissolve);
-  printf("  material.illum = %d\n", materials[i].illum);
-  printf("  material.map_Ka = %s\n", materials[i].ambient_texname.c_str());
-  printf("  material.map_Kd = %s\n", materials[i].diffuse_texname.c_str());
-  printf("  material.map_Ks = %s\n", materials[i].specular_texname.c_str());
-  printf("  material.map_Ns = %s\n", materials[i].specular_highlight_texname.c_str());
-  std::map<std::string, std::string>::const_iterator it(materials[i].unknown_parameter.begin());
-  std::map<std::string, std::string>::const_iterator itEnd(materials[i].unknown_parameter.end());
-  for (; it != itEnd; it++) {
-    printf("  material.%s = %s\n", it->first.c_str(), it->second.c_str());
-  }
-  printf("\n");
-}
 ```
 
-Reading .obj without triangulation. Use `num_vertices[i]` to iterate over faces(indices). `num_vertices[i]` stores the number of vertices for ith face.
+Each `shape_t::mesh_t` does not contain vertex data but contains array index to `attrib_t`.
+See `loader_example.cc` for more details.
+
+
+```
+
+mesh_t::indices => array of vertex indices.
+
+  +----+----+----+----+----+----+----+----+----+----+     +--------+
+  | i0 | i1 | i2 | i3 | i4 | i5 | i6 | i7 | i8 | i9 | ... | i(n-1) |
+  +----+----+----+----+----+----+----+----+----+----+     +--------+
+
+Each index has an array index to attrib_t::vertices, attrib_t::normals and attrib_t::texcoords.
+
+mesh_t::num_face_vertices => array of the number of vertices per face(e.g. 3 = triangle, 4 = quad , 5 or more = N-gons).
+
+
+  +---+---+---+        +---+
+  | 3 | 4 | 3 | ...... | 3 |
+  +---+---+---+        +---+
+    |   |   |            |
+    |   |   |            +-----------------------------------------+
+    |   |   |                                                      |
+    |   |   +------------------------------+                       |
+    |   |                                  |                       |
+    |   +------------------+               |                       |
+    |                      |               |                       |
+    |/                     |/              |/                      |/
+
+ mesh_t::indices
+
+  |    face[0]   |       face[1]     |    face[2]   |     |      face[n-1]           |
+  +----+----+----+----+----+----+----+----+----+----+     +--------+--------+--------+
+  | i0 | i1 | i2 | i3 | i4 | i5 | i6 | i7 | i8 | i9 | ... | i(n-3) | i(n-2) | i(n-1) | 
+  +----+----+----+----+----+----+----+----+----+----+     +--------+--------+--------+
+
+```
+
+Note that when `triangulate` flas is true in `tinyobj::LoadObj()` argument, `num_face_vertices` are all filled with 3(triangle).
+
+### float data type
+
+TinyObjLoader now use `real_t` for floating point data type.
+Default is `float(32bit)`. 
+You can enable `double(64bit)` precision by using `TINYOBJLOADER_USE_DOUBLE` define.
+
+#### Example code
+
 ```c++
 #define TINYOBJLOADER_IMPLEMENTATION // define this in only *one* .cc
 #include "tiny_obj_loader.h"
 
 std::string inputfile = "cornell_box.obj";
+tinyobj::attrib_t attrib;
 std::vector<tinyobj::shape_t> shapes;
 std::vector<tinyobj::material_t> materials;
   
 std::string err;
-bool triangulate = false;
-bool ret = tinyobj::LoadObj(shapes, materials, err, inputfile.c_str(), triangulate);
+bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, inputfile.c_str());
   
 if (!err.empty()) { // `err` may contain warning message.
   std::cerr << err << std::endl;
@@ -174,21 +230,53 @@ if (!ret) {
   exit(1);
 }
 
-for (size_t i = 0; i < shapes.size(); i++) {
-
-  size_t indexOffset = 0;
-  for (size_t n = 0; n < shapes[i].mesh.num_vertices.size(); n++) {
-    int ngon = shapes[i].mesh.num_vertices[n];
-    for (size_t f = 0; f < ngon; f++) {
-      unsigend int v = shapes[i].mesh.indices[indexOffset + f];
-      printf("  face[%ld] v[%ld] = (%f, %f, %f)\n", n,
-        shapes[i].mesh.positions[3*v+0],
-        shapes[i].mesh.positions[3*v+1],
-        shapes[i].mesh.positions[3*v+2]);
+// Loop over shapes
+for (size_t s = 0; s < shapes.size(); s++) {
+  // Loop over faces(polygon)
+  size_t index_offset = 0;
+  for (size_t f = 0; f < shapes[s].mesh.num_face_vertices.size(); f++) {
+    int fv = shapes[s].mesh.num_face_vertices[f];
 
+    // Loop over vertices in the face.
+    for (size_t v = 0; v < fv; v++) {
+      // access to vertex
+      tinyobj::index_t idx = shapes[s].mesh.indices[index_offset + v];
+      tinyobj::real_t vx = attrib.vertices[idx.vertex_index].x;
+      tinyobj::real_t vy = attrib.vertices[idx.vertex_index].y;
+      tinyobj::real_t vz = attrib.vertices[idx.vertex_index].z;
+      tinyobj::real_t nx = attrib.normals[idx.normal_index].x;
+      tinyobj::real_t ny = attrib.normals[idx.normal_index].y;
+      tinyobj::real_t nz = attrib.normals[idx.normal_index].z;
+      tinyobj::real_t tx = attrib.texcoords[2*idx.texcoord_index+0];
+      tinyobj::real_t ty = attrib.texcoords[2*idx.texcoord_index+1];
+      // Optional: vertex colors
+      // tinyobj::real_t red = attrib.colors[3*idx.vertex_index+0];
+      // tinyobj::real_t green = attrib.colors[3*idx.vertex_index+1];
+      // tinyobj::real_t blue = attrib.colors[3*idx.vertex_index+2];
     }
-    indexOffset += ngon;
-  }
+    index_offset += fv;
 
+    // per-face material
+    shapes[s].mesh.material_ids[f];
+  }
 }
+
 ```
+
+## Optimized loader
+
+Optimized multi-threaded .obj loader is available at `experimental/` directory.
+If you want absolute performance to load .obj data, this optimized loader will fit your purpose.
+Note that the optimized loader uses C++11 thread and it does less error checks but may work most .obj data.
+
+Here is some benchmark result. Time are measured on MacBook 12(Early 2016, Core m5 1.2GHz).
+
+* Rungholt scene(6M triangles)
+  * old version(v0.9.x): 15500 msecs.
+  * baseline(v1.0.x): 6800 msecs(2.3x faster than old version)
+  * optimised: 1500 msecs(10x faster than old version, 4.5x faster than baseline)
+
+
+## Tests
+
+Unit tests are provided in `tests` directory. See `tests/README.md` for details.

appveyor.yml

@@ -1,12 +1,22 @@
-version: 0.9.{build}
-
-# scripts that runs after repo cloning.
-install:
-  - vcsetup.bat
+version: 1.0.{build}
 
 platform: x64
-configuration: Release
 
-build:
-  parallel: true
-  project: TinyObjLoaderSolution.sln
+install:
+  #######################################################################################
+  # All external dependencies are installed in C:\projects\deps
+  #######################################################################################
+  - mkdir C:\projects\deps
+
+  #######################################################################################
+  # Install Ninja
+  #######################################################################################
+  - set NINJA_URL="https://github.com/ninja-build/ninja/releases/download/v1.6.0/ninja-win.zip"
+  - appveyor DownloadFile %NINJA_URL% -FileName ninja.zip
+  - 7z x ninja.zip -oC:\projects\deps\ninja > nul
+  - set PATH=C:\projects\deps\ninja;%PATH%
+  - ninja --version
+
+build_script:
+  - cd tests
+  - vcbuild.bat

build.ninja

@@ -1,16 +1,53 @@
-# build.ninja
-cc     = clang
-cxx    = clang++
-cflags = -Werror -Weverything
-cxxflags = -Werror -Weverything
+ninja_required_version = 1.4
 
-rule compile
-  command = $cxx $cxxflags -c $in -o $out
+gnubuilddir = build
+gnudefines = 
+gnuincludes = -I.
+gnucflags = -O2 -g
+gnucxxflags = -O2 -g -pedantic -Wall -Wextra -Wcast-align -Wcast-qual $
+    -Wctor-dtor-privacy -Wdisabled-optimization -Wformat=2 -Winit-self $
+    -Wmissing-declarations -Wmissing-include-dirs -Wold-style-cast $
+    -Woverloaded-virtual -Wredundant-decls -Wshadow -Wsign-conversion $
+    -Wsign-promo -Wstrict-overflow=5 -Wswitch-default -Wundef -Werror $
+    -Wno-unused -fsanitize=address
+gnuldflags = -fsanitize=address
 
-rule link
-  command = $cxx $in -o $out
+pool link_pool
+  depth = 1
 
-build test.o: compile test.cc
-build test: link test.o
+rule gnucxx
+  command = $gnucxx -MMD -MF $out.d $gnudefines $gnuincludes $gnucxxflags $
+      -c $in -o $out
+  description = CXX $out
+  depfile = $out.d
+  deps = gcc
+rule gnucc
+  command = $gnucc -MMD -MF $out.d $gnudefines $gnuincludes $gnucflags -c $
+      $in -o $out
+  description = CC $out
+  depfile = $out.d
+  deps = gcc
+rule gnulink
+  command = $gnuld -o $out $in $libs $gnuldflags
+  description = LINK $out
+  pool = link_pool
+rule gnuar
+  command = $gnuar rsc $out $in
+  description = AR $out
+  pool = link_pool
+rule gnustamp
+  command = touch $out
+  description = STAMP $out
 
-default test
+gnucxx = g++
+gnucc = gcc
+gnuld = $gnucxx
+gnuar = ar
+
+build loader_example.o: gnucxx loader_example.cc
+
+
+build loader_example: gnulink loader_example.o
+build all: phony loader_example
+
+default all

examples/callback_api/Makefile

@@ -0,0 +1,2 @@
+all:
+	clang++ -I../../ -Wall -g -o example main.cc

examples/callback_api/main.cc

@@ -0,0 +1,166 @@
+//
+// An example of how to use callback API.
+// This example is minimum and incomplete. Just showing the usage of callback
+// API.
+// You need to implement your own Mesh data struct constrution based on this
+// example in practical.
+//
+#define TINYOBJLOADER_IMPLEMENTATION
+#include "tiny_obj_loader.h"
+
+#include <cassert>
+#include <cstdio>
+#include <cstdlib>
+#include <fstream>
+#include <iostream>
+#include <sstream>
+
+typedef struct {
+  std::vector<float> vertices;
+  std::vector<float> normals;
+  std::vector<float> texcoords;
+  std::vector<int> v_indices;
+  std::vector<int> vn_indices;
+  std::vector<int> vt_indices;
+
+  std::vector<tinyobj::material_t> materials;
+
+} MyMesh;
+
+void vertex_cb(void *user_data, float x, float y, float z, float w) {
+  MyMesh *mesh = reinterpret_cast<MyMesh *>(user_data);
+  printf("v[%ld] = %f, %f, %f (w %f)\n", mesh->vertices.size() / 3, x, y, z, w);
+
+  mesh->vertices.push_back(x);
+  mesh->vertices.push_back(y);
+  mesh->vertices.push_back(z);
+  // Discard w
+}
+
+void normal_cb(void *user_data, float x, float y, float z) {
+  MyMesh *mesh = reinterpret_cast<MyMesh *>(user_data);
+  printf("vn[%ld] = %f, %f, %f\n", mesh->normals.size() / 3, x, y, z);
+
+  mesh->normals.push_back(x);
+  mesh->normals.push_back(y);
+  mesh->normals.push_back(z);
+}
+
+void texcoord_cb(void *user_data, float x, float y, float z) {
+  MyMesh *mesh = reinterpret_cast<MyMesh *>(user_data);
+  printf("vt[%ld] = %f, %f, %f\n", mesh->texcoords.size() / 3, x, y, z);
+
+  mesh->texcoords.push_back(x);
+  mesh->texcoords.push_back(y);
+  mesh->texcoords.push_back(z);
+}
+
+void index_cb(void *user_data, tinyobj::index_t *indices, int num_indices) {
+  // NOTE: the value of each index is raw value.
+  // For example, the application must manually adjust the index with offset
+  // (e.g. v_indices.size()) when the value is negative(whic means relative
+  // index).
+  // Also, the first index starts with 1, not 0.
+  // See fixIndex() function in tiny_obj_loader.h for details.
+  // Also, 0 is set for the index value which
+  // does not exist in .obj
+  MyMesh *mesh = reinterpret_cast<MyMesh *>(user_data);
+
+  for (int i = 0; i < num_indices; i++) {
+    tinyobj::index_t idx = indices[i];
+    printf("idx[%ld] = %d, %d, %d\n", mesh->v_indices.size(), idx.vertex_index,
+           idx.normal_index, idx.texcoord_index);
+
+    if (idx.vertex_index != 0) {
+      mesh->v_indices.push_back(idx.vertex_index);
+    }
+    if (idx.normal_index != 0) {
+      mesh->vn_indices.push_back(idx.normal_index);
+    }
+    if (idx.texcoord_index != 0) {
+      mesh->vt_indices.push_back(idx.texcoord_index);
+    }
+  }
+}
+
+void usemtl_cb(void *user_data, const char *name, int material_idx) {
+  MyMesh *mesh = reinterpret_cast<MyMesh *>(user_data);
+  if ((material_idx > -1) && (material_idx < mesh->materials.size())) {
+    printf("usemtl. material id = %d(name = %s)\n", material_idx,
+           mesh->materials[material_idx].name.c_str());
+  } else {
+    printf("usemtl. name = %s\n", name);
+  }
+}
+
+void mtllib_cb(void *user_data, const tinyobj::material_t *materials,
+               int num_materials) {
+  MyMesh *mesh = reinterpret_cast<MyMesh *>(user_data);
+  printf("mtllib. # of materials = %d\n", num_materials);
+
+  for (int i = 0; i < num_materials; i++) {
+    mesh->materials.push_back(materials[i]);
+  }
+}
+
+void group_cb(void *user_data, const char **names, int num_names) {
+  // MyMesh *mesh = reinterpret_cast<MyMesh*>(user_data);
+  printf("group : name = \n");
+
+  for (int i = 0; i < num_names; i++) {
+    printf("  %s\n", names[i]);
+  }
+}
+
+void object_cb(void *user_data, const char *name) {
+  // MyMesh *mesh = reinterpret_cast<MyMesh*>(user_data);
+  printf("object : name = %s\n", name);
+}
+
+int main(int argc, char **argv) {
+  tinyobj::callback_t cb;
+  cb.vertex_cb = vertex_cb;
+  cb.normal_cb = normal_cb;
+  cb.texcoord_cb = texcoord_cb;
+  cb.index_cb = index_cb;
+  cb.usemtl_cb = usemtl_cb;
+  cb.mtllib_cb = mtllib_cb;
+  cb.group_cb = group_cb;
+  cb.object_cb = object_cb;
+
+  MyMesh mesh;
+  std::string err;
+  std::string filename = "../../models/cornell_box.obj";
+  if (argc > 1) {
+    filename = std::string(argv[1]);
+  }
+  std::ifstream ifs(filename.c_str());
+
+  if (ifs.fail()) {
+    std::cerr << "file not found." << std::endl;
+    return EXIT_FAILURE;
+  }
+
+  tinyobj::MaterialFileReader mtlReader("../../models/");
+
+  bool ret = tinyobj::LoadObjWithCallback(ifs, cb, &mesh, &mtlReader, &err);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  if (!ret) {
+    std::cerr << "Failed to parse .obj" << std::endl;
+    return EXIT_FAILURE;
+  }
+
+  printf("# of vertices         = %ld\n", mesh.vertices.size() / 3);
+  printf("# of normals          = %ld\n", mesh.normals.size() / 3);
+  printf("# of texcoords        = %ld\n", mesh.texcoords.size() / 2);
+  printf("# of vertex indices   = %ld\n", mesh.v_indices.size());
+  printf("# of normal indices   = %ld\n", mesh.vn_indices.size());
+  printf("# of texcoord indices   = %ld\n", mesh.vt_indices.size());
+  printf("# of materials = %ld\n", mesh.materials.size());
+
+  return EXIT_SUCCESS;
+}

examples/viewer/README.md

@@ -0,0 +1,42 @@
+# Simple .obj viewer with glew + glfw3 + OpenGL
+
+## Requirements
+
+* premake5
+* glfw3
+* glew
+
+## Build on MaCOSX
+
+Install glfw3 and glew using brew.
+Then,
+
+    $ premake5 gmake
+    $ make
+
+## Build on Linux
+
+Set `PKG_CONFIG_PATH` or Edit path to glfw3 and glew in `premake4.lua`
+
+Then,
+
+    $ premake5 gmake
+    $ make
+
+## Build on Windows.
+
+* Visual Studio 2013
+* Windows 64bit
+  * 32bit may work.
+
+Put glfw3 and glew library somewhere and replace include and lib path in `premake4.lua`
+
+Then,
+
+    > premake5.exe vs2013
+
+## TODO
+
+* [ ] Support per-face material.
+* [ ] Use shader-based GL rendering.
+* [ ] PBR shader support.

examples/viewer/premake4.lua

@@ -0,0 +1,44 @@
+solution "objview"
+	-- location ( "build" )
+	configurations { "Release", "Debug" }
+	platforms {"native", "x64", "x32"}
+	
+	project "objview"
+
+		kind "ConsoleApp"
+		language "C++"
+		files { "viewer.cc", "trackball.cc" }
+		includedirs { "./" }
+		includedirs { "../../" }
+
+		configuration { "linux" }
+			linkoptions { "`pkg-config --libs glfw3`" }
+			links { "GL", "GLU", "m", "GLEW", "X11", "Xrandr", "Xinerama", "Xi", "Xxf86vm", "Xcursor", "dl" }
+			linkoptions { "-pthread" }
+
+		configuration { "windows" }
+			-- Path to GLFW3
+			includedirs { '../../../../local/glfw-3.1.2.bin.WIN64/include' }
+			libdirs { '../../../../local/glfw-3.1.2.bin.WIN64/lib-vc2013' }
+			-- Path to GLEW
+			includedirs { '../../../../local/glew-1.13.0/include' }
+			libdirs { '../../../../local/glew-1.13.0/lib/Release/x64' }
+
+			links { "glfw3", "glew32", "gdi32", "winmm", "user32", "glu32","opengl32", "kernel32" }
+			defines { "_CRT_SECURE_NO_WARNINGS" }
+
+		configuration { "macosx" }
+			includedirs { "/usr/local/include" }
+			buildoptions { "-Wno-deprecated-declarations" }
+			libdirs { "/usr/local/lib" }
+			links { "glfw3", "GLEW" }
+			linkoptions { "-framework OpenGL", "-framework Cocoa", "-framework IOKit", "-framework CoreVideo" }
+
+		configuration "Debug"
+			defines { "DEBUG" }
+			flags { "Symbols", "ExtraWarnings"}
+
+		configuration "Release"
+			defines { "NDEBUG" }
+			flags { "Optimize", "ExtraWarnings"}
+

examples/viewer/trackball.cc

@@ -0,0 +1,292 @@
+/*
+ * (c) Copyright 1993, 1994, Silicon Graphics, Inc.
+ * ALL RIGHTS RESERVED
+ * Permission to use, copy, modify, and distribute this software for
+ * any purpose and without fee is hereby granted, provided that the above
+ * copyright notice appear in all copies and that both the copyright notice
+ * and this permission notice appear in supporting documentation, and that
+ * the name of Silicon Graphics, Inc. not be used in advertising
+ * or publicity pertaining to distribution of the software without specific,
+ * written prior permission.
+ *
+ * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
+ * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
+ * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
+ * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
+ * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
+ * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
+ * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
+ * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
+ * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
+ * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * US Government Users Restricted Rights
+ * Use, duplication, or disclosure by the Government is subject to
+ * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
+ * (c)(1)(ii) of the Rights in Technical Data and Computer Software
+ * clause at DFARS 252.227-7013 and/or in similar or successor
+ * clauses in the FAR or the DOD or NASA FAR Supplement.
+ * Unpublished-- rights reserved under the copyright laws of the
+ * United States.  Contractor/manufacturer is Silicon Graphics,
+ * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
+ *
+ * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
+ */
+/*
+ * Trackball code:
+ *
+ * Implementation of a virtual trackball.
+ * Implemented by Gavin Bell, lots of ideas from Thant Tessman and
+ *   the August '88 issue of Siggraph's "Computer Graphics," pp. 121-129.
+ *
+ * Vector manip code:
+ *
+ * Original code from:
+ * David M. Ciemiewicz, Mark Grossman, Henry Moreton, and Paul Haeberli
+ *
+ * Much mucking with by:
+ * Gavin Bell
+ */
+#include <math.h>
+#include "trackball.h"
+
+/*
+ * This size should really be based on the distance from the center of
+ * rotation to the point on the object underneath the mouse.  That
+ * point would then track the mouse as closely as possible.  This is a
+ * simple example, though, so that is left as an Exercise for the
+ * Programmer.
+ */
+#define TRACKBALLSIZE (0.8)
+
+/*
+ * Local function prototypes (not defined in trackball.h)
+ */
+static float tb_project_to_sphere(float, float, float);
+static void normalize_quat(float[4]);
+
+static void vzero(float *v) {
+  v[0] = 0.0;
+  v[1] = 0.0;
+  v[2] = 0.0;
+}
+
+static void vset(float *v, float x, float y, float z) {
+  v[0] = x;
+  v[1] = y;
+  v[2] = z;
+}
+
+static void vsub(const float *src1, const float *src2, float *dst) {
+  dst[0] = src1[0] - src2[0];
+  dst[1] = src1[1] - src2[1];
+  dst[2] = src1[2] - src2[2];
+}
+
+static void vcopy(const float *v1, float *v2) {
+  register int i;
+  for (i = 0; i < 3; i++)
+    v2[i] = v1[i];
+}
+
+static void vcross(const float *v1, const float *v2, float *cross) {
+  float temp[3];
+
+  temp[0] = (v1[1] * v2[2]) - (v1[2] * v2[1]);
+  temp[1] = (v1[2] * v2[0]) - (v1[0] * v2[2]);
+  temp[2] = (v1[0] * v2[1]) - (v1[1] * v2[0]);
+  vcopy(temp, cross);
+}
+
+static float vlength(const float *v) {
+  return sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]);
+}
+
+static void vscale(float *v, float div) {
+  v[0] *= div;
+  v[1] *= div;
+  v[2] *= div;
+}
+
+static void vnormal(float *v) { vscale(v, 1.0 / vlength(v)); }
+
+static float vdot(const float *v1, const float *v2) {
+  return v1[0] * v2[0] + v1[1] * v2[1] + v1[2] * v2[2];
+}
+
+static void vadd(const float *src1, const float *src2, float *dst) {
+  dst[0] = src1[0] + src2[0];
+  dst[1] = src1[1] + src2[1];
+  dst[2] = src1[2] + src2[2];
+}
+
+/*
+ * Ok, simulate a track-ball.  Project the points onto the virtual
+ * trackball, then figure out the axis of rotation, which is the cross
+ * product of P1 P2 and O P1 (O is the center of the ball, 0,0,0)
+ * Note:  This is a deformed trackball-- is a trackball in the center,
+ * but is deformed into a hyperbolic sheet of rotation away from the
+ * center.  This particular function was chosen after trying out
+ * several variations.
+ *
+ * It is assumed that the arguments to this routine are in the range
+ * (-1.0 ... 1.0)
+ */
+void trackball(float q[4], float p1x, float p1y, float p2x, float p2y) {
+  float a[3]; /* Axis of rotation */
+  float phi;  /* how much to rotate about axis */
+  float p1[3], p2[3], d[3];
+  float t;
+
+  if (p1x == p2x && p1y == p2y) {
+    /* Zero rotation */
+    vzero(q);
+    q[3] = 1.0;
+    return;
+  }
+
+  /*
+   * First, figure out z-coordinates for projection of P1 and P2 to
+   * deformed sphere
+   */
+  vset(p1, p1x, p1y, tb_project_to_sphere(TRACKBALLSIZE, p1x, p1y));
+  vset(p2, p2x, p2y, tb_project_to_sphere(TRACKBALLSIZE, p2x, p2y));
+
+  /*
+   *  Now, we want the cross product of P1 and P2
+   */
+  vcross(p2, p1, a);
+
+  /*
+   *  Figure out how much to rotate around that axis.
+   */
+  vsub(p1, p2, d);
+  t = vlength(d) / (2.0 * TRACKBALLSIZE);
+
+  /*
+   * Avoid problems with out-of-control values...
+   */
+  if (t > 1.0)
+    t = 1.0;
+  if (t < -1.0)
+    t = -1.0;
+  phi = 2.0 * asin(t);
+
+  axis_to_quat(a, phi, q);
+}
+
+/*
+ *  Given an axis and angle, compute quaternion.
+ */
+void axis_to_quat(float a[3], float phi, float q[4]) {
+  vnormal(a);
+  vcopy(a, q);
+  vscale(q, sin(phi / 2.0));
+  q[3] = cos(phi / 2.0);
+}
+
+/*
+ * Project an x,y pair onto a sphere of radius r OR a hyperbolic sheet
+ * if we are away from the center of the sphere.
+ */
+static float tb_project_to_sphere(float r, float x, float y) {
+  float d, t, z;
+
+  d = sqrt(x * x + y * y);
+  if (d < r * 0.70710678118654752440) { /* Inside sphere */
+    z = sqrt(r * r - d * d);
+  } else { /* On hyperbola */
+    t = r / 1.41421356237309504880;
+    z = t * t / d;
+  }
+  return z;
+}
+
+/*
+ * Given two rotations, e1 and e2, expressed as quaternion rotations,
+ * figure out the equivalent single rotation and stuff it into dest.
+ *
+ * This routine also normalizes the result every RENORMCOUNT times it is
+ * called, to keep error from creeping in.
+ *
+ * NOTE: This routine is written so that q1 or q2 may be the same
+ * as dest (or each other).
+ */
+
+#define RENORMCOUNT 97
+
+void add_quats(float q1[4], float q2[4], float dest[4]) {
+  static int count = 0;
+  float t1[4], t2[4], t3[4];
+  float tf[4];
+
+  vcopy(q1, t1);
+  vscale(t1, q2[3]);
+
+  vcopy(q2, t2);
+  vscale(t2, q1[3]);
+
+  vcross(q2, q1, t3);
+  vadd(t1, t2, tf);
+  vadd(t3, tf, tf);
+  tf[3] = q1[3] * q2[3] - vdot(q1, q2);
+
+  dest[0] = tf[0];
+  dest[1] = tf[1];
+  dest[2] = tf[2];
+  dest[3] = tf[3];
+
+  if (++count > RENORMCOUNT) {
+    count = 0;
+    normalize_quat(dest);
+  }
+}
+
+/*
+ * Quaternions always obey:  a^2 + b^2 + c^2 + d^2 = 1.0
+ * If they don't add up to 1.0, dividing by their magnitued will
+ * renormalize them.
+ *
+ * Note: See the following for more information on quaternions:
+ *
+ * - Shoemake, K., Animating rotation with quaternion curves, Computer
+ *   Graphics 19, No 3 (Proc. SIGGRAPH'85), 245-254, 1985.
+ * - Pletinckx, D., Quaternion calculus as a basic tool in computer
+ *   graphics, The Visual Computer 5, 2-13, 1989.
+ */
+static void normalize_quat(float q[4]) {
+  int i;
+  float mag;
+
+  mag = (q[0] * q[0] + q[1] * q[1] + q[2] * q[2] + q[3] * q[3]);
+  for (i = 0; i < 4; i++)
+    q[i] /= mag;
+}
+
+/*
+ * Build a rotation matrix, given a quaternion rotation.
+ *
+ */
+void build_rotmatrix(float m[4][4], const float q[4]) {
+  m[0][0] = 1.0 - 2.0 * (q[1] * q[1] + q[2] * q[2]);
+  m[0][1] = 2.0 * (q[0] * q[1] - q[2] * q[3]);
+  m[0][2] = 2.0 * (q[2] * q[0] + q[1] * q[3]);
+  m[0][3] = 0.0;
+
+  m[1][0] = 2.0 * (q[0] * q[1] + q[2] * q[3]);
+  m[1][1] = 1.0 - 2.0 * (q[2] * q[2] + q[0] * q[0]);
+  m[1][2] = 2.0 * (q[1] * q[2] - q[0] * q[3]);
+  m[1][3] = 0.0;
+
+  m[2][0] = 2.0 * (q[2] * q[0] - q[1] * q[3]);
+  m[2][1] = 2.0 * (q[1] * q[2] + q[0] * q[3]);
+  m[2][2] = 1.0 - 2.0 * (q[1] * q[1] + q[0] * q[0]);
+  m[2][3] = 0.0;
+
+  m[3][0] = 0.0;
+  m[3][1] = 0.0;
+  m[3][2] = 0.0;
+  m[3][3] = 1.0;
+}

examples/viewer/trackball.h

@@ -0,0 +1,75 @@
+/*
+ * (c) Copyright 1993, 1994, Silicon Graphics, Inc.
+ * ALL RIGHTS RESERVED
+ * Permission to use, copy, modify, and distribute this software for
+ * any purpose and without fee is hereby granted, provided that the above
+ * copyright notice appear in all copies and that both the copyright notice
+ * and this permission notice appear in supporting documentation, and that
+ * the name of Silicon Graphics, Inc. not be used in advertising
+ * or publicity pertaining to distribution of the software without specific,
+ * written prior permission.
+ *
+ * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
+ * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
+ * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
+ * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
+ * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
+ * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
+ * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
+ * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
+ * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
+ * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * US Government Users Restricted Rights
+ * Use, duplication, or disclosure by the Government is subject to
+ * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
+ * (c)(1)(ii) of the Rights in Technical Data and Computer Software
+ * clause at DFARS 252.227-7013 and/or in similar or successor
+ * clauses in the FAR or the DOD or NASA FAR Supplement.
+ * Unpublished-- rights reserved under the copyright laws of the
+ * United States.  Contractor/manufacturer is Silicon Graphics,
+ * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
+ *
+ * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
+ */
+/*
+ * trackball.h
+ * A virtual trackball implementation
+ * Written by Gavin Bell for Silicon Graphics, November 1988.
+ */
+
+/*
+ * Pass the x and y coordinates of the last and current positions of
+ * the mouse, scaled so they are from (-1.0 ... 1.0).
+ *
+ * The resulting rotation is returned as a quaternion rotation in the
+ * first paramater.
+ */
+void trackball(float q[4], float p1x, float p1y, float p2x, float p2y);
+
+void negate_quat(float *q, float *qn);
+
+/*
+ * Given two quaternions, add them together to get a third quaternion.
+ * Adding quaternions to get a compound rotation is analagous to adding
+ * translations to get a compound translation.  When incrementally
+ * adding rotations, the first argument here should be the new
+ * rotation, the second and third the total rotation (which will be
+ * over-written with the resulting new total rotation).
+ */
+void add_quats(float *q1, float *q2, float *dest);
+
+/*
+ * A useful function, builds a rotation matrix in Matrix based on
+ * given quaternion.
+ */
+void build_rotmatrix(float m[4][4], const float q[4]);
+
+/*
+ * This function computes a quaternion based on an axis (defined by
+ * the given vector) and an angle about which to rotate.  The angle is
+ * expressed in radians.  The result is put into the third argument.
+ */
+void axis_to_quat(float a[3], float phi, float q[4]);

examples/viewer/viewer.cc

@@ -0,0 +1,713 @@
+//
+// Simple .obj viewer(vertex only)
+//
+#include <algorithm>
+#include <cassert>
+#include <cmath>
+#include <cstdio>
+#include <cstdlib>
+#include <iostream>
+#include <limits>
+#include <map>
+#include <string>
+#include <vector>
+
+#include <GL/glew.h>
+
+#ifdef __APPLE__
+#include <OpenGL/glu.h>
+#else
+#include <GL/glu.h>
+#endif
+
+#include <GLFW/glfw3.h>
+
+#define TINYOBJLOADER_IMPLEMENTATION
+#include "../../tiny_obj_loader.h"
+
+#include "trackball.h"
+
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+
+#ifdef _WIN32
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include <windows.h>
+
+#ifdef max
+ #undef max
+#endif
+
+#ifdef min
+ #undef min
+#endif
+
+#include <mmsystem.h>
+#ifdef __cplusplus
+}
+#endif
+#pragma comment(lib, "winmm.lib")
+#else
+#if defined(__unix__) || defined(__APPLE__)
+#include <sys/time.h>
+#else
+#include <ctime>
+#endif
+#endif
+
+class timerutil {
+ public:
+#ifdef _WIN32
+  typedef DWORD time_t;
+
+  timerutil() { ::timeBeginPeriod(1); }
+  ~timerutil() { ::timeEndPeriod(1); }
+
+  void start() { t_[0] = ::timeGetTime(); }
+  void end() { t_[1] = ::timeGetTime(); }
+
+  time_t sec() { return (time_t)((t_[1] - t_[0]) / 1000); }
+  time_t msec() { return (time_t)((t_[1] - t_[0])); }
+  time_t usec() { return (time_t)((t_[1] - t_[0]) * 1000); }
+  time_t current() { return ::timeGetTime(); }
+
+#else
+#if defined(__unix__) || defined(__APPLE__)
+  typedef unsigned long int time_t;
+
+  void start() { gettimeofday(tv + 0, &tz); }
+  void end() { gettimeofday(tv + 1, &tz); }
+
+  time_t sec() { return (time_t)(tv[1].tv_sec - tv[0].tv_sec); }
+  time_t msec() {
+    return this->sec() * 1000 +
+           (time_t)((tv[1].tv_usec - tv[0].tv_usec) / 1000);
+  }
+  time_t usec() {
+    return this->sec() * 1000000 + (time_t)(tv[1].tv_usec - tv[0].tv_usec);
+  }
+  time_t current() {
+    struct timeval t;
+    gettimeofday(&t, NULL);
+    return (time_t)(t.tv_sec * 1000 + t.tv_usec);
+  }
+
+#else  // C timer
+  // using namespace std;
+  typedef clock_t time_t;
+
+  void start() { t_[0] = clock(); }
+  void end() { t_[1] = clock(); }
+
+  time_t sec() { return (time_t)((t_[1] - t_[0]) / CLOCKS_PER_SEC); }
+  time_t msec() { return (time_t)((t_[1] - t_[0]) * 1000 / CLOCKS_PER_SEC); }
+  time_t usec() { return (time_t)((t_[1] - t_[0]) * 1000000 / CLOCKS_PER_SEC); }
+  time_t current() { return (time_t)clock(); }
+
+#endif
+#endif
+
+ private:
+#ifdef _WIN32
+  DWORD t_[2];
+#else
+#if defined(__unix__) || defined(__APPLE__)
+  struct timeval tv[2];
+  struct timezone tz;
+#else
+  time_t t_[2];
+#endif
+#endif
+};
+
+typedef struct {
+  GLuint vb_id;  // vertex buffer id
+  int numTriangles;
+  size_t material_id;
+} DrawObject;
+
+std::vector<DrawObject> gDrawObjects;
+
+int width = 768;
+int height = 768;
+
+double prevMouseX, prevMouseY;
+bool mouseLeftPressed;
+bool mouseMiddlePressed;
+bool mouseRightPressed;
+float curr_quat[4];
+float prev_quat[4];
+float eye[3], lookat[3], up[3];
+
+GLFWwindow* window;
+
+static std::string GetBaseDir(const std::string &filepath) {
+  if (filepath.find_last_of("/\\") != std::string::npos)
+    return filepath.substr(0, filepath.find_last_of("/\\"));
+  return "";
+}
+
+static bool FileExists(const std::string &abs_filename) {
+  bool ret;
+  FILE *fp = fopen(abs_filename.c_str(), "rb");
+  if (fp) {
+    ret = true;
+    fclose(fp);
+  } else {
+    ret = false;
+  }
+
+  return ret;
+}
+
+static void CheckErrors(std::string desc) {
+  GLenum e = glGetError();
+  if (e != GL_NO_ERROR) {
+    fprintf(stderr, "OpenGL error in \"%s\": %d (%d)\n", desc.c_str(), e, e);
+    exit(20);
+  }
+}
+
+static void CalcNormal(float N[3], float v0[3], float v1[3], float v2[3]) {
+  float v10[3];
+  v10[0] = v1[0] - v0[0];
+  v10[1] = v1[1] - v0[1];
+  v10[2] = v1[2] - v0[2];
+
+  float v20[3];
+  v20[0] = v2[0] - v0[0];
+  v20[1] = v2[1] - v0[1];
+  v20[2] = v2[2] - v0[2];
+
+  N[0] = v20[1] * v10[2] - v20[2] * v10[1];
+  N[1] = v20[2] * v10[0] - v20[0] * v10[2];
+  N[2] = v20[0] * v10[1] - v20[1] * v10[0];
+
+  float len2 = N[0] * N[0] + N[1] * N[1] + N[2] * N[2];
+  if (len2 > 0.0f) {
+    float len = sqrtf(len2);
+
+    N[0] /= len;
+    N[1] /= len;
+  }
+}
+
+static bool LoadObjAndConvert(float bmin[3], float bmax[3],
+                       std::vector<DrawObject>* drawObjects,
+                       std::vector<tinyobj::material_t>& materials,
+                       std::map<std::string, GLuint>& textures,
+                       const char* filename) {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+
+  timerutil tm;
+
+  tm.start();
+
+  std::string base_dir = GetBaseDir(filename);
+  if (base_dir.empty()) {
+    base_dir = ".";
+  }
+#ifdef _WIN32
+  base_dir += "\\";
+#else
+  base_dir += "/";
+#endif
+
+  std::string err;
+  bool ret =
+      tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename, base_dir.c_str());
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  tm.end();
+
+  if (!ret) {
+    std::cerr << "Failed to load " << filename << std::endl;
+    return false;
+  }
+
+  printf("Parsing time: %d [ms]\n", (int)tm.msec());
+
+  printf("# of vertices  = %d\n", (int)(attrib.vertices.size()) / 3);
+  printf("# of normals   = %d\n", (int)(attrib.normals.size()) / 3);
+  printf("# of texcoords = %d\n", (int)(attrib.texcoords.size()) / 2);
+  printf("# of materials = %d\n", (int)materials.size());
+  printf("# of shapes    = %d\n", (int)shapes.size());
+
+  // Append `default` material
+  materials.push_back(tinyobj::material_t());
+
+  for (size_t i = 0; i < materials.size(); i++) {
+    printf("material[%d].diffuse_texname = %s\n", int(i), materials[i].diffuse_texname.c_str());
+  }
+
+  // Load diffuse textures
+  {
+      for (size_t m = 0; m < materials.size(); m++) {
+          tinyobj::material_t* mp = &materials[m];
+          
+          if (mp->diffuse_texname.length() > 0) {
+              // Only load the texture if it is not already loaded
+              if (textures.find(mp->diffuse_texname) == textures.end()) {
+                  GLuint texture_id;
+                  int w, h;
+                  int comp;
+
+                  std::string texture_filename = mp->diffuse_texname;
+                  if (!FileExists(texture_filename)) {
+                    // Append base dir.
+                    texture_filename = base_dir + mp->diffuse_texname;
+                    if (!FileExists(texture_filename)) {
+                      std::cerr << "Unable to find file: " << mp->diffuse_texname << std::endl;
+                      exit(1);
+                    }
+                  }
+                  
+                  unsigned char* image = stbi_load(texture_filename.c_str(), &w, &h, &comp, STBI_default);
+                  if (!image) {
+                      std::cerr << "Unable to load texture: " << texture_filename << std::endl;
+                      exit(1);
+                  }
+                  std::cout << "Loaded texture: " << texture_filename << ", w = " << w << ", h = " << h << ", comp = " << comp << std::endl;
+
+                  glGenTextures(1, &texture_id);
+                  glBindTexture(GL_TEXTURE_2D, texture_id);
+                  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+                  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+                  if (comp == 3) {
+                      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
+                  }
+                  else if (comp == 4) {
+                      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image);
+                  } else {
+                      assert(0); // TODO
+                  }
+                  glBindTexture(GL_TEXTURE_2D, 0);
+                  stbi_image_free(image);
+                  textures.insert(std::make_pair(mp->diffuse_texname, texture_id));
+              }
+          }
+      }
+  }
+
+  bmin[0] = bmin[1] = bmin[2] = std::numeric_limits<float>::max();
+  bmax[0] = bmax[1] = bmax[2] = -std::numeric_limits<float>::max();
+
+  {
+    for (size_t s = 0; s < shapes.size(); s++) {
+      DrawObject o;
+      std::vector<float> buffer;  // pos(3float), normal(3float), color(3float)
+      for (size_t f = 0; f < shapes[s].mesh.indices.size() / 3; f++) {
+        tinyobj::index_t idx0 = shapes[s].mesh.indices[3 * f + 0];
+        tinyobj::index_t idx1 = shapes[s].mesh.indices[3 * f + 1];
+        tinyobj::index_t idx2 = shapes[s].mesh.indices[3 * f + 2];
+        
+        int current_material_id = shapes[s].mesh.material_ids[f];
+
+        if ((current_material_id < 0) || (current_material_id >= static_cast<int>(materials.size()))) {
+          // Invaid material ID. Use default material.
+          current_material_id = materials.size() - 1; // Default material is added to the last item in `materials`.
+        }
+        //if (current_material_id >= materials.size()) {
+        //    std::cerr << "Invalid material index: " << current_material_id << std::endl;
+        //}
+        //
+        float diffuse[3];
+        for (size_t i = 0; i < 3; i++) {
+            diffuse[i] = materials[current_material_id].diffuse[i];
+        }
+        float tc[3][2];
+        if (attrib.texcoords.size() > 0) {
+            assert(attrib.texcoords.size() > 2 * idx0.texcoord_index + 1);
+            assert(attrib.texcoords.size() > 2 * idx1.texcoord_index + 1);
+            assert(attrib.texcoords.size() > 2 * idx2.texcoord_index + 1);
+
+            // Flip Y coord.
+            tc[0][0] = attrib.texcoords[2 * idx0.texcoord_index];
+            tc[0][1] = 1.0f - attrib.texcoords[2 * idx0.texcoord_index + 1];
+            tc[1][0] = attrib.texcoords[2 * idx1.texcoord_index];
+            tc[1][1] = 1.0f - attrib.texcoords[2 * idx1.texcoord_index + 1];
+            tc[2][0] = attrib.texcoords[2 * idx2.texcoord_index];
+            tc[2][1] = 1.0f - attrib.texcoords[2 * idx2.texcoord_index + 1];
+        } else {
+            tc[0][0] = 0.0f;
+            tc[0][1] = 0.0f;
+            tc[1][0] = 0.0f;
+            tc[1][1] = 0.0f;
+            tc[2][0] = 0.0f;
+            tc[2][1] = 0.0f;
+        }
+
+        float v[3][3];
+        for (int k = 0; k < 3; k++) {
+          int f0 = idx0.vertex_index;
+          int f1 = idx1.vertex_index;
+          int f2 = idx2.vertex_index;
+          assert(f0 >= 0);
+          assert(f1 >= 0);
+          assert(f2 >= 0);
+
+          v[0][k] = attrib.vertices[3 * f0 + k];
+          v[1][k] = attrib.vertices[3 * f1 + k];
+          v[2][k] = attrib.vertices[3 * f2 + k];
+          bmin[k] = std::min(v[0][k], bmin[k]);
+          bmin[k] = std::min(v[1][k], bmin[k]);
+          bmin[k] = std::min(v[2][k], bmin[k]);
+          bmax[k] = std::max(v[0][k], bmax[k]);
+          bmax[k] = std::max(v[1][k], bmax[k]);
+          bmax[k] = std::max(v[2][k], bmax[k]);
+        }
+
+        float n[3][3];
+        if (attrib.normals.size() > 0) {
+          int f0 = idx0.normal_index;
+          int f1 = idx1.normal_index;
+          int f2 = idx2.normal_index;
+          assert(f0 >= 0);
+          assert(f1 >= 0);
+          assert(f2 >= 0);
+          for (int k = 0; k < 3; k++) {
+            n[0][k] = attrib.normals[3 * f0 + k];
+            n[1][k] = attrib.normals[3 * f1 + k];
+            n[2][k] = attrib.normals[3 * f2 + k];
+          }
+        } else {
+          // compute geometric normal
+          CalcNormal(n[0], v[0], v[1], v[2]);
+          n[1][0] = n[0][0];
+          n[1][1] = n[0][1];
+          n[1][2] = n[0][2];
+          n[2][0] = n[0][0];
+          n[2][1] = n[0][1];
+          n[2][2] = n[0][2];
+        }
+
+        for (int k = 0; k < 3; k++) {
+          buffer.push_back(v[k][0]);
+          buffer.push_back(v[k][1]);
+          buffer.push_back(v[k][2]);
+          buffer.push_back(n[k][0]);
+          buffer.push_back(n[k][1]);
+          buffer.push_back(n[k][2]);
+          // Combine normal and diffuse to get color.
+          float normal_factor = 0.2;
+          float diffuse_factor = 1 - normal_factor;
+          float c[3] = {
+              n[k][0] * normal_factor + diffuse[0] * diffuse_factor,
+              n[k][1] * normal_factor + diffuse[1] * diffuse_factor,
+              n[k][2] * normal_factor + diffuse[2] * diffuse_factor
+          };
+          float len2 = c[0] * c[0] + c[1] * c[1] + c[2] * c[2];
+          if (len2 > 0.0f) {
+            float len = sqrtf(len2);
+
+            c[0] /= len;
+            c[1] /= len;
+            c[2] /= len;
+          }
+          buffer.push_back(c[0] * 0.5 + 0.5);
+          buffer.push_back(c[1] * 0.5 + 0.5);
+          buffer.push_back(c[2] * 0.5 + 0.5);
+          
+          buffer.push_back(tc[k][0]);
+          buffer.push_back(tc[k][1]);
+        }
+      }
+
+      o.vb_id = 0;
+      o.numTriangles = 0;
+
+      // OpenGL viewer does not support texturing with per-face material.
+      if (shapes[s].mesh.material_ids.size() > 0 && shapes[s].mesh.material_ids.size() > s) {
+          o.material_id = shapes[s].mesh.material_ids[0]; // use the material ID of the first face.
+      } else {
+          o.material_id = materials.size() - 1; // = ID for default material.
+      }
+      printf("shape[%d] material_id %d\n", int(s), int(o.material_id));
+          
+      if (buffer.size() > 0) {
+        glGenBuffers(1, &o.vb_id);
+        glBindBuffer(GL_ARRAY_BUFFER, o.vb_id);
+        glBufferData(GL_ARRAY_BUFFER, buffer.size() * sizeof(float), &buffer.at(0),
+                     GL_STATIC_DRAW);
+        o.numTriangles = buffer.size() / (3 + 3 + 3 + 2) / 3; // 3:vtx, 3:normal, 3:col, 2:texcoord
+
+        printf("shape[%d] # of triangles = %d\n", static_cast<int>(s),
+               o.numTriangles);
+      }
+
+      drawObjects->push_back(o);
+    }
+  }
+
+  printf("bmin = %f, %f, %f\n", bmin[0], bmin[1], bmin[2]);
+  printf("bmax = %f, %f, %f\n", bmax[0], bmax[1], bmax[2]);
+
+  return true;
+}
+
+static void reshapeFunc(GLFWwindow* window, int w, int h) {
+  int fb_w, fb_h;
+  // Get actual framebuffer size.
+  glfwGetFramebufferSize(window, &fb_w, &fb_h);
+
+  glViewport(0, 0, fb_w, fb_h);
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+  gluPerspective(45.0, (float)w / (float)h, 0.01f, 100.0f);
+  glMatrixMode(GL_MODELVIEW);
+  glLoadIdentity();
+
+  width = w;
+  height = h;
+}
+
+static void keyboardFunc(GLFWwindow* window, int key, int scancode, int action,
+                  int mods) {
+  (void)window;
+  (void)scancode;
+  (void)mods;
+  if (action == GLFW_PRESS || action == GLFW_REPEAT) {
+    // Move camera
+    float mv_x = 0, mv_y = 0, mv_z = 0;
+    if (key == GLFW_KEY_K)
+      mv_x += 1;
+    else if (key == GLFW_KEY_J)
+      mv_x += -1;
+    else if (key == GLFW_KEY_L)
+      mv_y += 1;
+    else if (key == GLFW_KEY_H)
+      mv_y += -1;
+    else if (key == GLFW_KEY_P)
+      mv_z += 1;
+    else if (key == GLFW_KEY_N)
+      mv_z += -1;
+    // camera.move(mv_x * 0.05, mv_y * 0.05, mv_z * 0.05);
+    // Close window
+    if (key == GLFW_KEY_Q || key == GLFW_KEY_ESCAPE)
+      glfwSetWindowShouldClose(window, GL_TRUE);
+
+    // init_frame = true;
+  }
+}
+
+static void clickFunc(GLFWwindow* window, int button, int action, int mods) {
+  (void)window;
+  (void)mods;
+  if (button == GLFW_MOUSE_BUTTON_LEFT) {
+    if (action == GLFW_PRESS) {
+      mouseLeftPressed = true;
+      trackball(prev_quat, 0.0, 0.0, 0.0, 0.0);
+    } else if (action == GLFW_RELEASE) {
+      mouseLeftPressed = false;
+    }
+  }
+  if (button == GLFW_MOUSE_BUTTON_RIGHT) {
+    if (action == GLFW_PRESS) {
+      mouseRightPressed = true;
+    } else if (action == GLFW_RELEASE) {
+      mouseRightPressed = false;
+    }
+  }
+  if (button == GLFW_MOUSE_BUTTON_MIDDLE) {
+    if (action == GLFW_PRESS) {
+      mouseMiddlePressed = true;
+    } else if (action == GLFW_RELEASE) {
+      mouseMiddlePressed = false;
+    }
+  }
+}
+
+static void motionFunc(GLFWwindow* window, double mouse_x, double mouse_y) {
+  (void)window;
+  float rotScale = 1.0f;
+  float transScale = 2.0f;
+
+  if (mouseLeftPressed) {
+    trackball(prev_quat, rotScale * (2.0f * prevMouseX - width) / (float)width,
+              rotScale * (height - 2.0f * prevMouseY) / (float)height,
+              rotScale * (2.0f * mouse_x - width) / (float)width,
+              rotScale * (height - 2.0f * mouse_y) / (float)height);
+
+    add_quats(prev_quat, curr_quat, curr_quat);
+  } else if (mouseMiddlePressed) {
+    eye[0] -= transScale * (mouse_x - prevMouseX) / (float)width;
+    lookat[0] -= transScale * (mouse_x - prevMouseX) / (float)width;
+    eye[1] += transScale * (mouse_y - prevMouseY) / (float)height;
+    lookat[1] += transScale * (mouse_y - prevMouseY) / (float)height;
+  } else if (mouseRightPressed) {
+    eye[2] += transScale * (mouse_y - prevMouseY) / (float)height;
+    lookat[2] += transScale * (mouse_y - prevMouseY) / (float)height;
+  }
+
+  // Update mouse point
+  prevMouseX = mouse_x;
+  prevMouseY = mouse_y;
+}
+
+static void Draw(const std::vector<DrawObject>& drawObjects, std::vector<tinyobj::material_t>& materials, std::map<std::string, GLuint>& textures) {
+  glPolygonMode(GL_FRONT, GL_FILL);
+  glPolygonMode(GL_BACK, GL_FILL);
+
+  glEnable(GL_POLYGON_OFFSET_FILL);
+  glPolygonOffset(1.0, 1.0);
+  GLsizei stride = (3 + 3 + 3 + 2) * sizeof(float);
+  for (size_t i = 0; i < drawObjects.size(); i++) {
+    DrawObject o = drawObjects[i];
+    if (o.vb_id < 1) {
+      continue;
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, o.vb_id);
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_NORMAL_ARRAY);
+    glEnableClientState(GL_COLOR_ARRAY);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+    if ((o.material_id < materials.size())) {
+      std::string diffuse_texname = materials[o.material_id].diffuse_texname;
+      if (textures.find(diffuse_texname) != textures.end()) {
+          glBindTexture(GL_TEXTURE_2D, textures[diffuse_texname]);
+      }
+    }
+    glVertexPointer(3, GL_FLOAT, stride, (const void*)0);
+    glNormalPointer(GL_FLOAT, stride, (const void*)(sizeof(float) * 3));
+    glColorPointer(3, GL_FLOAT, stride, (const void*)(sizeof(float) * 6));
+    glTexCoordPointer(2, GL_FLOAT, stride, (const void*)(sizeof(float) * 9));
+
+    glDrawArrays(GL_TRIANGLES, 0, 3 * o.numTriangles);
+    CheckErrors("drawarrays");
+    glBindTexture(GL_TEXTURE_2D, 0);
+  }
+
+  // draw wireframe
+  glDisable(GL_POLYGON_OFFSET_FILL);
+  glPolygonMode(GL_FRONT, GL_LINE);
+  glPolygonMode(GL_BACK, GL_LINE);
+
+  glColor3f(0.0f, 0.0f, 0.4f);
+  for (size_t i = 0; i < drawObjects.size(); i++) {
+    DrawObject o = drawObjects[i];
+    if (o.vb_id < 1) {
+      continue;
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, o.vb_id);
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_NORMAL_ARRAY);
+    glDisableClientState(GL_COLOR_ARRAY);
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+    glVertexPointer(3, GL_FLOAT, stride, (const void*)0);
+    glNormalPointer(GL_FLOAT, stride, (const void*)(sizeof(float) * 3));
+    glColorPointer(3, GL_FLOAT, stride, (const void*)(sizeof(float) * 6));
+    glTexCoordPointer(2, GL_FLOAT, stride, (const void*)(sizeof(float) * 9));
+
+    glDrawArrays(GL_TRIANGLES, 0, 3 * o.numTriangles);
+    CheckErrors("drawarrays");
+  }
+}
+
+static void Init() {
+  trackball(curr_quat, 0, 0, 0, 0);
+
+  eye[0] = 0.0f;
+  eye[1] = 0.0f;
+  eye[2] = 3.0f;
+
+  lookat[0] = 0.0f;
+  lookat[1] = 0.0f;
+  lookat[2] = 0.0f;
+
+  up[0] = 0.0f;
+  up[1] = 1.0f;
+  up[2] = 0.0f;
+}
+
+int main(int argc, char** argv) {
+  if (argc < 2) {
+    std::cout << "Needs input.obj\n" << std::endl;
+    return 0;
+  }
+
+  Init();
+
+  if (!glfwInit()) {
+    std::cerr << "Failed to initialize GLFW." << std::endl;
+    return -1;
+  }
+
+  window = glfwCreateWindow(width, height, "Obj viewer", NULL, NULL);
+  if (window == NULL) {
+    std::cerr << "Failed to open GLFW window. " << std::endl;
+    glfwTerminate();
+    return 1;
+  }
+
+  glfwMakeContextCurrent(window);
+  glfwSwapInterval(1);
+
+  // Callback
+  glfwSetWindowSizeCallback(window, reshapeFunc);
+  glfwSetKeyCallback(window, keyboardFunc);
+  glfwSetMouseButtonCallback(window, clickFunc);
+  glfwSetCursorPosCallback(window, motionFunc);
+
+  glewExperimental = true;
+  if (glewInit() != GLEW_OK) {
+    std::cerr << "Failed to initialize GLEW." << std::endl;
+    return -1;
+  }
+
+  reshapeFunc(window, width, height);
+
+  float bmin[3], bmax[3];
+  std::vector<tinyobj::material_t> materials;
+  std::map<std::string, GLuint> textures;
+  if (false == LoadObjAndConvert(bmin, bmax, &gDrawObjects, materials, textures, argv[1])) {
+    return -1;
+  }
+
+  float maxExtent = 0.5f * (bmax[0] - bmin[0]);
+  if (maxExtent < 0.5f * (bmax[1] - bmin[1])) {
+    maxExtent = 0.5f * (bmax[1] - bmin[1]);
+  }
+  if (maxExtent < 0.5f * (bmax[2] - bmin[2])) {
+    maxExtent = 0.5f * (bmax[2] - bmin[2]);
+  }
+
+  while (glfwWindowShouldClose(window) == GL_FALSE) {
+    glfwPollEvents();
+    glClearColor(0.1f, 0.2f, 0.3f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_TEXTURE_2D);
+
+    // camera & rotate
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    GLfloat mat[4][4];
+    gluLookAt(eye[0], eye[1], eye[2], lookat[0], lookat[1], lookat[2], up[0],
+              up[1], up[2]);
+    build_rotmatrix(mat, curr_quat);
+    glMultMatrixf(&mat[0][0]);
+
+    // Fit to -1, 1
+    glScalef(1.0f / maxExtent, 1.0f / maxExtent, 1.0f / maxExtent);
+
+    // Centerize object.
+    glTranslatef(-0.5 * (bmax[0] + bmin[0]), -0.5 * (bmax[1] + bmin[1]),
+                 -0.5 * (bmax[2] + bmin[2]));
+
+    Draw(gDrawObjects, materials, textures);
+
+    glfwSwapBuffers(window);
+  }
+
+  glfwTerminate();
+}

examples/voxelize/Makefile

@@ -0,0 +1,2 @@
+all:
+	g++ -o voxelizer main.cc

examples/voxelize/README.md

@@ -0,0 +1,5 @@
+# Voxelize .obj and export it as also in .obj
+
+## Third party library
+
+This example uses https://github.com/karimnaaji/voxelizer, which is licensed under MIT Liense.

examples/voxelize/main.cc

@@ -0,0 +1,74 @@
+#define VOXELIZER_IMPLEMENTATION
+#include "voxelizer.h"
+
+#define TINYOBJLOADER_IMPLEMENTATION
+#include "../../tiny_obj_loader.h"
+
+bool Voxelize(const char* filename, float voxelsizex, float voxelsizey, float voxelsizez, float precision)
+{
+    tinyobj::attrib_t attrib;
+    std::vector<tinyobj::shape_t> shapes;
+    std::vector<tinyobj::material_t> materials;
+    std::string err;
+    bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename);
+
+    if (!err.empty()) {
+      printf("err: %s\n", err.c_str());
+    }
+
+    if (!ret) {
+      printf("failed to load : %s\n", filename);
+      return false;
+    }
+
+    if (shapes.size() == 0) {
+      printf("err: # of shapes are zero.\n");
+      return false;
+    }
+
+    // Only use first shape.
+    {
+        vx_mesh_t* mesh;
+        vx_mesh_t* result;
+
+        mesh = vx_mesh_alloc(attrib.vertices.size(), shapes[0].mesh.indices.size());
+
+        for (size_t f = 0; f < shapes[0].mesh.indices.size(); f++) {
+            mesh->indices[f] = shapes[0].mesh.indices[f].vertex_index;
+        }
+
+        for (size_t v = 0; v < attrib.vertices.size() / 3; v++) {
+            mesh->vertices[v].x = attrib.vertices[3*v+0];
+            mesh->vertices[v].y = attrib.vertices[3*v+1];
+            mesh->vertices[v].z = attrib.vertices[3*v+2];
+        }
+
+        result = vx_voxelize(mesh, voxelsizex, voxelsizey, voxelsizez, precision);
+
+        printf("Number of vertices: %ld\n", result->nvertices);
+        printf("Number of indices: %ld\n", result->nindices);
+    }
+    return true;
+}
+
+
+int
+main(
+  int argc,
+  char** argv)
+{
+  if (argc < 4) {
+    printf("Usage: voxelize input.obj voxelsizex voxelsizey voxelsizez precision\n");
+    exit(-1);
+  }
+
+  const char* filename = argv[1];
+  float voxelsizex = atof(argv[2]);
+  float voxelsizey = atof(argv[3]);
+  float voxelsizez = atof(argv[4]);
+  float prec = atof(argv[5]);
+  bool ret = Voxelize(filename, voxelsizex, voxelsizey, voxelsizez, prec);
+
+  return ret ? EXIT_SUCCESS : EXIT_FAILURE;
+}
+

examples/voxelize/voxelizer.h

@@ -0,0 +1,764 @@
+//
+// LICENCE:
+//  The MIT License (MIT)
+//
+//  Copyright (c) 2016 Karim Naaji, karim.naaji@gmail.com
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE
+//
+// REFERENCES:
+//  http://matthias-mueller-fischer.ch/publications/tetraederCollision.pdf
+//  http://fileadmin.cs.lth.se/cs/Personal/Tomas_Akenine-Moller/code/tribox2.txt
+//
+// HOWTO:
+//  #define VOXELIZER_IMPLEMENTATION
+//  #define VOXELIZER_DEBUG // Only if assertions need to be checked
+//  #include "voxelizer.h"
+//
+// HISTORY:
+//  - version 0.9.0: Initial
+//
+// TODO:
+//  - Triangle face merging
+//  - Add colors from input mesh
+//  - Potential issue with voxel bigger than triangle
+//
+
+#ifndef VOXELIZER_H
+#define VOXELIZER_H
+
+// ------------------------------------------------------------------------------------------------
+// VOXELIZER PUBLIC API
+//
+
+#ifndef VOXELIZER_HELPERS
+#include <stdlib.h> // malloc, calloc, free
+#endif
+
+typedef struct vx_vertex {
+    union {
+        float v[3];
+        struct {
+            float x;
+            float y;
+            float z;
+        };
+    };
+} vx_vertex_t;
+
+typedef struct vx_mesh {
+    vx_vertex_t* vertices;          // Contiguous mesh vertices
+    vx_vertex_t* normals;           // Contiguous mesh normals
+    unsigned int* indices;          // Mesh indices
+    unsigned int* normalindices;    // Mesh normal indices
+    size_t nindices;                // The number of normal indices
+    size_t nvertices;               // The number of vertices
+    size_t nnormals;                // The number of normals
+} vx_mesh_t;
+
+vx_mesh_t* vx_voxelize(vx_mesh_t* _mesh,    // The input mesh
+        float voxelsizex,                   // Voxel size on X-axis
+        float voxelsizey,                   // Voxel size on Y-axis
+        float voxelsizez,                   // Voxel size on Z-axis
+        float precision);                   // A precision factor that reduces "holes" artifact
+                                            // usually a precision = voxelsize / 10. works ok.
+
+void vx_mesh_free(vx_mesh_t* _mesh);
+vx_mesh_t* vx_mesh_alloc(int nindices, int nvertices);
+
+// Voxelizer Helpers, define your own if needed
+#ifndef VOXELIZER_HELPERS
+#define VOXELIZER_HELPERS 1
+#define VX_MIN(a, b) (a > b ? b : a)
+#define VX_MAX(a, b) (a > b ? a : b)
+#define VX_FINDMINMAX(x0, x1, x2, min, max) \
+    min = max = x0;                         \
+    if (x1 < min) min = x1;                 \
+    if (x1 > max) max = x1;                 \
+    if (x2 < min) min = x2;                 \
+    if (x2 > max) max = x2;
+#define VX_CLAMP(v, lo, hi) VX_MAX(lo, VX_MIN(hi, v))
+#define VX_MALLOC(T, N) ((T*) malloc(N * sizeof(T)))
+#define VX_FREE(T) free(T)
+#define VX_CALLOC(T, N) ((T*) calloc(N * sizeof(T), 1))
+#define VX_SWAP(T, A, B) { T tmp = B; B = A; A = tmp; }
+#ifdef VOXELIZER_DEBUG
+#define VX_ASSERT(STMT) if (!(STMT)) { *(int *)0 = 0; }
+#else
+#define VX_ASSERT(STMT)
+#endif // VOXELIZER_DEBUG
+#endif // VOXELIZER_HELPERS
+
+//
+// END VOXELIZER PUBLIC API
+// ------------------------------------------------------------------------------------------------
+
+#endif // VOXELIZER_H
+
+#ifdef VOXELIZER_IMPLEMENTATION
+
+#include <math.h>       // ceil, fabs & al.
+#include <stdbool.h>    // hughh
+#include <string.h>     // memcpy
+
+#define VOXELIZER_EPSILON               (0.0000001)
+#define VOXELIZER_NORMAL_INDICES_SIZE   (6)
+#define VOXELIZER_INDICES_SIZE          (36)
+#define VOXELIZER_HASH_TABLE_SIZE       (4096)
+
+unsigned int vx_voxel_indices[VOXELIZER_INDICES_SIZE] = {
+    0, 1, 2,
+    0, 2, 3,
+    3, 2, 6,
+    3, 6, 7,
+    0, 7, 4,
+    0, 3, 7,
+    4, 7, 5,
+    7, 6, 5,
+    0, 4, 5,
+    0, 5, 1,
+    1, 5, 6,
+    1, 6, 2,
+};
+
+float vx_normals[18] = {
+     0.0, -1.0,  0.0,
+     0.0,  1.0,  0.0,
+     1.0,  0.0,  0.0,
+     0.0,  0.0,  1.0,
+    -1.0,  0.0,  0.0,
+     0.0,  0.0, -1.0,
+};
+
+unsigned int vx_normal_indices[VOXELIZER_NORMAL_INDICES_SIZE] = {
+    3, 2, 1, 5, 4, 0,
+};
+
+typedef struct vx_aabb {
+    vx_vertex_t min;
+    vx_vertex_t max;
+} vx_aabb_t;
+
+typedef struct vx_edge {
+    vx_vertex_t p1;
+    vx_vertex_t p2;
+} vx_edge_t;
+
+typedef struct vx_triangle {
+    vx_vertex_t p1;
+    vx_vertex_t p2;
+    vx_vertex_t p3;
+} vx_triangle_t;
+
+typedef struct vx_hash_table_node {
+    struct vx_hash_table_node* next;
+    struct vx_hash_table_node* prev;
+    void* data;
+} vx_hash_table_node_t;
+
+typedef struct vx_hash_table {
+    vx_hash_table_node_t** elements;
+    size_t size;
+} vx_hash_table_t;
+
+vx_hash_table_t* vx__hash_table_alloc(size_t size)
+{
+    vx_hash_table_t* table = VX_MALLOC(vx_hash_table_t, 1);
+    if (!table) { return NULL; }
+    table->size = size;
+    table->elements = VX_MALLOC(vx_hash_table_node_t*, size);
+    if (!table->elements) { return NULL; }
+    for (size_t i = 0; i < table->size; ++i) {
+        table->elements[i] = NULL;
+    }
+    return table;
+}
+
+void vx__hash_table_free(vx_hash_table_t* table, bool freedata)
+{
+    for (size_t i = 0; i < table->size; ++i) {
+        vx_hash_table_node_t* node = table->elements[i];
+
+        if (node) {
+            if (node->next) {
+                while (node->next) {
+                    node = node->next;
+                    if (freedata) {
+                        VX_FREE(node->prev->data);
+                    }
+                    VX_FREE(node->prev);
+                }
+                VX_FREE(node);
+            } else {
+                VX_FREE(node->data);
+                VX_FREE(node);
+            }
+        }
+    }
+
+    VX_FREE(table->elements);
+    VX_FREE(table);
+}
+
+bool vx__hash_table_insert(vx_hash_table_t* table,
+    size_t hash,
+    void* data,
+    bool (*compfunc)(void* d1, void* d2))
+{
+    if (!table->elements[hash]) {
+        table->elements[hash] = VX_MALLOC(vx_hash_table_node_t, 1);
+        table->elements[hash]->prev = NULL;
+        table->elements[hash]->next = NULL;
+        table->elements[hash]->data = data;
+    } else {
+        vx_hash_table_node_t* node = table->elements[hash];
+
+        if (compfunc && compfunc(node->data, data)) {
+            return false;
+        }
+
+        while (node->next) {
+            node = node->next;
+            if (compfunc && compfunc(node->data, data)) {
+                return false;
+            }
+        }
+
+        vx_hash_table_node_t* nnode = VX_MALLOC(vx_hash_table_node_t, 1);
+
+        nnode->prev = node;
+        nnode->next = NULL;
+        nnode->data = data;
+        node->next = nnode;
+    }
+    return true;
+}
+
+void vx_mesh_free(vx_mesh_t* m)
+{
+    VX_FREE(m->vertices);
+    m->vertices = NULL;
+    m->nvertices = 0;
+    VX_FREE(m->indices);
+    m->indices = NULL;
+    m->nindices = 0;
+    if (m->normals) { VX_FREE(m->normals); }
+    VX_FREE(m);
+}
+
+vx_mesh_t* vx_mesh_alloc(int nvertices, int nindices)
+{
+    vx_mesh_t* m = VX_MALLOC(vx_mesh_t, 1);
+    if (!m) { return NULL; }
+    m->indices = VX_CALLOC(unsigned int, nindices);
+    if (!m->indices) { return NULL; }
+    m->vertices = VX_CALLOC(vx_vertex_t, nvertices);
+    if (!m->vertices) { return NULL; }
+    m->normals = NULL;
+    m->nindices = nindices;
+    m->nvertices = nvertices;
+    return m;
+}
+
+float vx__map_to_voxel(float position, float voxelSize, bool min)
+{
+    float vox = (position + (position < 0.f ? -1.f : 1.f) * voxelSize * 0.5f) / voxelSize;
+    return (min ? floor(vox) : ceil(vox)) * voxelSize;
+}
+
+vx_vertex_t vx__vertex_cross(vx_vertex_t* v1, vx_vertex_t* v2)
+{
+    vx_vertex_t cross;
+    cross.x = v1->y * v2->z - v1->z * v2->y;
+    cross.y = v1->z * v2->x - v1->x * v2->z;
+    cross.z = v1->x * v2->y - v1->y * v2->x;
+    return cross;
+}
+
+bool vx__vertex_equals(vx_vertex_t* v1, vx_vertex_t* v2) {
+    return fabs(v1->x - v2->x) < VOXELIZER_EPSILON &&
+           fabs(v1->y - v2->y) < VOXELIZER_EPSILON &&
+           fabs(v1->z - v2->z) < VOXELIZER_EPSILON;
+}
+
+bool vx__vertex_comp_func(void* a, void* b)
+{
+    return vx__vertex_equals((vx_vertex_t*) a, (vx_vertex_t*) b);
+}
+
+void vx__vertex_sub(vx_vertex_t* a, vx_vertex_t* b)
+{
+    a->x -= b->x;
+    a->y -= b->y;
+    a->z -= b->z;
+}
+
+void vx__vertex_add(vx_vertex_t* a, vx_vertex_t* b)
+{
+    a->x += b->x;
+    a->y += b->y;
+    a->z += b->z;
+}
+
+void vx__vertex_multiply(vx_vertex_t* a, float v)
+{
+    a->x *= v;
+    a->y *= v;
+    a->z *= v;
+}
+
+float vx__vertex_dot(vx_vertex_t* v1, vx_vertex_t* v2)
+{
+    return v1->x * v2->x + v1->y * v2->y + v1->z * v2->z;
+}
+
+int vx__plane_box_overlap(vx_vertex_t* normal,
+    float d,
+    vx_vertex_t* halfboxsize)
+{
+    vx_vertex_t vmin, vmax;
+
+    for (int dim = 0; dim <= 2; dim++) {
+        if (normal->v[dim] > 0.0f) {
+            vmin.v[dim] = -halfboxsize->v[dim];
+            vmax.v[dim] = halfboxsize->v[dim];
+        } else {
+            vmin.v[dim] = halfboxsize->v[dim];
+            vmax.v[dim] = -halfboxsize->v[dim];
+        }
+    }
+
+    if (vx__vertex_dot(normal, &vmin) + d > 0.0f) {
+        return false;
+    }
+
+    if (vx__vertex_dot(normal, &vmax) + d >= 0.0f) {
+        return true;
+    }
+
+    return false;
+}
+
+#define AXISTEST_X01(a, b, fa, fb)                 \
+    p1 = a * v1.y - b * v1.z;                      \
+    p3 = a * v3.y - b * v3.z;                      \
+    if (p1 < p3) {                                 \
+        min = p1; max = p3;                        \
+    } else {                                       \
+        min = p3; max = p1;                        \
+    }                                              \
+    rad = fa * halfboxsize.y + fb * halfboxsize.z; \
+    if (min > rad || max < -rad) {                 \
+        return false;                              \
+    }                                              \
+
+#define AXISTEST_X2(a, b, fa, fb)                  \
+    p1 = a * v1.y - b * v1.z;                      \
+    p2 = a * v2.y - b * v2.z;                      \
+    if (p1 < p2) {                                 \
+        min = p1; max = p2;                        \
+    } else {                                       \
+        min = p2; max = p1;                        \
+    }                                              \
+    rad = fa * halfboxsize.y + fb * halfboxsize.z; \
+    if (min > rad || max < -rad) {                 \
+        return false;                              \
+    }                                              \
+
+#define AXISTEST_Y02(a, b, fa, fb)                 \
+    p1 = -a * v1.x + b * v1.z;                     \
+    p3 = -a * v3.x + b * v3.z;                     \
+    if (p1 < p3) {                                 \
+        min = p1; max = p3;                        \
+    } else {                                       \
+        min = p3; max = p1;                        \
+    }                                              \
+    rad = fa * halfboxsize.x + fb * halfboxsize.z; \
+    if (min > rad || max < -rad) {                 \
+        return false;                              \
+    }                                              \
+
+#define AXISTEST_Y1(a, b, fa, fb)                  \
+    p1 = -a * v1.x + b * v1.z;                     \
+    p2 = -a * v2.x + b * v2.z;                     \
+    if (p1 < p2) {                                 \
+        min = p1; max = p2;                        \
+    } else {                                       \
+        min = p2; max = p1;                        \
+    }                                              \
+    rad = fa * halfboxsize.x + fb * halfboxsize.z; \
+    if (min > rad || max < -rad) {                 \
+        return false;                              \
+    }
+
+#define AXISTEST_Z12(a, b, fa, fb)                 \
+    p2 = a * v2.x - b * v2.y;                      \
+    p3 = a * v3.x - b * v3.y;                      \
+    if (p3 < p2) {                                 \
+        min = p3; max = p2;                        \
+    } else {                                       \
+        min = p2; max = p3;                        \
+    }                                              \
+    rad = fa * halfboxsize.x + fb * halfboxsize.y; \
+    if (min > rad || max < -rad) {                 \
+        return false;                              \
+    }
+
+#define AXISTEST_Z0(a, b, fa, fb)                  \
+    p1 = a * v1.x - b * v1.y;                      \
+    p2 = a * v2.x - b * v2.y;                      \
+    if (p1 < p2) {                                 \
+        min = p1; max = p2;                        \
+    } else {                                       \
+        min = p2; max = p1;                        \
+    }                                              \
+    rad = fa * halfboxsize.x + fb * halfboxsize.y; \
+    if (min > rad || max < -rad) {                 \
+        return false;                              \
+    }
+
+int vx__triangle_box_overlap(vx_vertex_t boxcenter,
+    vx_vertex_t halfboxsize,
+    vx_triangle_t triangle)
+{
+    vx_vertex_t v1, v2, v3, normal, e1, e2, e3;
+    float min, max, d, p1, p2, p3, rad, fex, fey, fez;
+
+    v1 = triangle.p1;
+    v2 = triangle.p2;
+    v3 = triangle.p3;
+
+    vx__vertex_sub(&v1, &boxcenter);
+    vx__vertex_sub(&v2, &boxcenter);
+    vx__vertex_sub(&v3, &boxcenter);
+
+    e1 = v2;
+    e2 = v3;
+    e3 = v1;
+
+    vx__vertex_sub(&e1, &v1);
+    vx__vertex_sub(&e2, &v2);
+    vx__vertex_sub(&e3, &v3);
+
+    fex = fabs(e1.x);
+    fey = fabs(e1.y);
+    fez = fabs(e1.z);
+
+    AXISTEST_X01(e1.z, e1.y, fez, fey);
+    AXISTEST_Y02(e1.z, e1.x, fez, fex);
+    AXISTEST_Z12(e1.y, e1.x, fey, fex);
+
+    fex = fabs(e2.x);
+    fey = fabs(e2.y);
+    fez = fabs(e2.z);
+
+    AXISTEST_X01(e2.z, e2.y, fez, fey);
+    AXISTEST_Y02(e2.z, e2.x, fez, fex);
+    AXISTEST_Z0(e2.y, e2.x, fey, fex);
+
+    fex = fabs(e3.x);
+    fey = fabs(e3.y);
+    fez = fabs(e3.z);
+
+    AXISTEST_X2(e3.z, e3.y, fez, fey);
+    AXISTEST_Y1(e3.z, e3.x, fez, fex);
+    AXISTEST_Z12(e3.y, e3.x, fey, fex);
+
+    VX_FINDMINMAX(v1.x, v2.x, v3.x, min, max);
+    if (min > halfboxsize.x || max < -halfboxsize.x) {
+        return false;
+    }
+
+    VX_FINDMINMAX(v1.y, v2.y, v3.y, min, max);
+    if (min > halfboxsize.y || max < -halfboxsize.y) {
+        return false;
+    }
+
+    VX_FINDMINMAX(v1.z, v2.z, v3.z, min, max);
+    if (min > halfboxsize.z || max < -halfboxsize.z) {
+        return false;
+    }
+
+    normal = vx__vertex_cross(&e1, &e2);
+    d = -vx__vertex_dot(&normal, &v1);
+
+    if (!vx__plane_box_overlap(&normal, d, &halfboxsize)) {
+        return false;
+    }
+
+    return true;
+}
+
+#undef AXISTEST_X2
+#undef AXISTEST_X01
+#undef AXISTEST_Y1
+#undef AXISTEST_Y02
+#undef AXISTEST_Z0
+#undef AXISTEST_Z12
+
+float vx__triangle_area(vx_triangle_t* triangle) {
+    vx_vertex_t ab = triangle->p2;
+    vx_vertex_t ac = triangle->p3;
+
+    vx__vertex_sub(&ab, &triangle->p1);
+    vx__vertex_sub(&ac, &triangle->p1);
+
+    float a0 = ab.y * ac.z - ab.z * ac.y;
+    float a1 = ab.z * ac.x - ab.x * ac.z;
+    float a2 = ab.x * ac.y - ab.y * ac.x;
+
+    return sqrtf(powf(a0, 2.f) + powf(a1, 2.f) + powf(a2, 2.f)) * 0.5f;
+}
+
+void vx__aabb_init(vx_aabb_t* aabb)
+{
+    aabb->max.x = aabb->max.y = aabb->max.z = -INFINITY;
+    aabb->min.x = aabb->min.y = aabb->min.z = INFINITY;
+}
+
+vx_aabb_t vx__triangle_aabb(vx_triangle_t* triangle)
+{
+    vx_aabb_t aabb;
+
+    vx__aabb_init(&aabb);
+
+    aabb.max.x = VX_MAX(aabb.max.x, triangle->p1.x); aabb.max.x = VX_MAX(aabb.max.x,
+            triangle->p2.x); aabb.max.x = VX_MAX(aabb.max.x, triangle->p3.x);
+    aabb.max.y = VX_MAX(aabb.max.y, triangle->p1.y); aabb.max.y = VX_MAX(aabb.max.y,
+            triangle->p2.y); aabb.max.y = VX_MAX(aabb.max.y, triangle->p3.y);
+    aabb.max.z = VX_MAX(aabb.max.z, triangle->p1.z); aabb.max.z = VX_MAX(aabb.max.z,
+            triangle->p2.z); aabb.max.z = VX_MAX(aabb.max.z, triangle->p3.z);
+
+    aabb.min.x = VX_MIN(aabb.min.x, triangle->p1.x); aabb.min.x = VX_MIN(aabb.min.x,
+            triangle->p2.x); aabb.min.x = VX_MIN(aabb.min.x, triangle->p3.x);
+    aabb.min.y = VX_MIN(aabb.min.y, triangle->p1.y); aabb.min.y = VX_MIN(aabb.min.y,
+            triangle->p2.y); aabb.min.y = VX_MIN(aabb.min.y, triangle->p3.y);
+    aabb.min.z = VX_MIN(aabb.min.z, triangle->p1.z); aabb.min.z = VX_MIN(aabb.min.z,
+            triangle->p2.z); aabb.min.z = VX_MIN(aabb.min.z, triangle->p3.z);
+
+    return aabb;
+}
+
+vx_vertex_t vx__aabb_center(vx_aabb_t* a)
+{
+    vx_vertex_t boxcenter = a->min;
+    vx__vertex_add(&boxcenter, &a->max);
+    vx__vertex_multiply(&boxcenter, 0.5f);
+
+    return boxcenter;
+}
+
+vx_vertex_t vx__aabb_half_size(vx_aabb_t* a)
+{
+    vx_vertex_t size;
+
+    size.x = fabs(a->max.x - a->min.x) * 0.5f;
+    size.y = fabs(a->max.y - a->min.y) * 0.5f;
+    size.z = fabs(a->max.z - a->min.z) * 0.5f;
+
+    return size;
+}
+
+vx_aabb_t vx__aabb_merge(vx_aabb_t* a, vx_aabb_t* b)
+{
+    vx_aabb_t merge;
+
+    merge.min.x = VX_MIN(a->min.x, b->min.x);
+    merge.min.y = VX_MIN(a->min.y, b->min.y);
+    merge.min.z = VX_MIN(a->min.z, b->min.z);
+
+    merge.max.x = VX_MAX(a->max.x, b->max.x);
+    merge.max.y = VX_MAX(a->max.y, b->max.y);
+    merge.max.z = VX_MAX(a->max.z, b->max.z);
+
+    return merge;
+}
+
+size_t vx__vertex_hash(vx_vertex_t pos, size_t n)
+{
+    size_t a = (size_t)(pos.x * 73856093);
+    size_t b = (size_t)(pos.y * 19349663);
+    size_t c = (size_t)(pos.z * 83492791);
+
+    return (a ^ b ^ c) % n;
+}
+
+void vx__add_voxel(vx_mesh_t* mesh,
+    vx_vertex_t* pos,
+    float* vertices)
+{
+    for (size_t i = 0; i < 8; ++i) {
+        size_t index = i+mesh->nvertices;
+
+        mesh->vertices[index].x = vertices[i*3+0] + pos->x;
+        mesh->vertices[index].y = vertices[i*3+1] + pos->y;
+        mesh->vertices[index].z = vertices[i*3+2] + pos->z;
+    }
+
+    int j = -1;
+    for (size_t i = 0; i < VOXELIZER_INDICES_SIZE; ++i) {
+        if (i % 6 == 0) {
+            j++;
+        }
+        mesh->normalindices[i+mesh->nindices] = vx_normal_indices[j];
+    }
+
+    for (size_t i = 0; i < VOXELIZER_INDICES_SIZE; ++i) {
+        mesh->indices[i+mesh->nindices] = vx_voxel_indices[i] + mesh->nvertices;
+    }
+
+    mesh->nindices += VOXELIZER_INDICES_SIZE;
+    mesh->nvertices += 8;
+}
+
+vx_mesh_t* vx_voxelize(vx_mesh_t* m,
+    float voxelsizex,
+    float voxelsizey,
+    float voxelsizez,
+    float precision)
+{
+    vx_mesh_t* outmesh = NULL;
+    vx_hash_table_t* table = NULL;
+    size_t voxels = 0;
+
+    float halfsizex = voxelsizex * 0.5f;
+    float halfsizey = voxelsizey * 0.5f;
+    float halfsizez = voxelsizez * 0.5f;
+
+    table = vx__hash_table_alloc(VOXELIZER_HASH_TABLE_SIZE);
+
+    for (int i = 0; i < m->nindices; i += 3) {
+        vx_triangle_t triangle;
+
+        VX_ASSERT(m->indices[i+0] < m->nvertices);
+        VX_ASSERT(m->indices[i+1] < m->nvertices);
+        VX_ASSERT(m->indices[i+2] < m->nvertices);
+
+        triangle.p1 = m->vertices[m->indices[i+0]];
+        triangle.p2 = m->vertices[m->indices[i+1]];
+        triangle.p3 = m->vertices[m->indices[i+2]];
+
+        if (vx__triangle_area(&triangle) < VOXELIZER_EPSILON) {
+            // triangle with 0 area
+            continue;
+        }
+
+        vx_aabb_t aabb = vx__triangle_aabb(&triangle);
+
+        aabb.min.x = vx__map_to_voxel(aabb.min.x, voxelsizex, true);
+        aabb.min.y = vx__map_to_voxel(aabb.min.y, voxelsizey, true);
+        aabb.min.z = vx__map_to_voxel(aabb.min.z, voxelsizez, true);
+
+        aabb.max.x = vx__map_to_voxel(aabb.max.x, voxelsizex, false);
+        aabb.max.y = vx__map_to_voxel(aabb.max.y, voxelsizey, false);
+        aabb.max.z = vx__map_to_voxel(aabb.max.z, voxelsizez, false);
+
+        for (float x = aabb.min.x; x < aabb.max.x; x += voxelsizex) {
+            for (float y = aabb.min.y; y < aabb.max.y; y += voxelsizey) {
+                for (float z = aabb.min.z; z < aabb.max.z; z += voxelsizez) {
+                    vx_aabb_t saabb;
+
+                    saabb.min.x = x - halfsizex;
+                    saabb.min.y = y - halfsizey;
+                    saabb.min.z = z - halfsizez;
+                    saabb.max.x = x + halfsizex;
+                    saabb.max.y = y + halfsizey;
+                    saabb.max.z = z + halfsizez;
+
+                    vx_vertex_t boxcenter = vx__aabb_center(&saabb);
+                    vx_vertex_t halfsize = vx__aabb_half_size(&saabb);
+
+                    // HACK: some holes might appear, this
+                    // precision factor reduces the artifact
+                    halfsize.x += precision;
+                    halfsize.y += precision;
+                    halfsize.z += precision;
+
+                    if (vx__triangle_box_overlap(boxcenter, halfsize, triangle)) {
+                        vx_vertex_t* nodedata = VX_MALLOC(vx_vertex_t, 1);
+                        *nodedata = boxcenter;
+
+                        size_t hash = vx__vertex_hash(boxcenter, VOXELIZER_HASH_TABLE_SIZE);
+
+                        bool insert = vx__hash_table_insert(table,
+                                hash,
+                                nodedata,
+                                vx__vertex_comp_func);
+
+                        if (insert) {
+                            voxels++;
+                        }
+                   }
+                }
+            }
+        }
+    }
+
+    outmesh = VX_MALLOC(vx_mesh_t, 1);
+    size_t nvertices = voxels * 8;
+    size_t nindices = voxels * VOXELIZER_INDICES_SIZE;
+    outmesh->nnormals = VOXELIZER_NORMAL_INDICES_SIZE;
+    outmesh->vertices = VX_CALLOC(vx_vertex_t, nvertices);
+    outmesh->normals = VX_CALLOC(vx_vertex_t, 6);
+    outmesh->indices = VX_CALLOC(unsigned int, nindices);
+    outmesh->normalindices = VX_CALLOC(unsigned int, nindices);
+    outmesh->nindices = 0;
+    outmesh->nvertices = 0;
+
+    memcpy(outmesh->normals, vx_normals, 18 * sizeof(float));
+
+    float vertices[24] = {
+        -halfsizex,  halfsizey,  halfsizez,
+        -halfsizex, -halfsizey,  halfsizez,
+         halfsizex, -halfsizey,  halfsizez,
+         halfsizex,  halfsizey,  halfsizez,
+        -halfsizex,  halfsizey, -halfsizez,
+        -halfsizex, -halfsizey, -halfsizez,
+         halfsizex, -halfsizey, -halfsizez,
+         halfsizex,  halfsizey, -halfsizez,
+    };
+
+    for (size_t i = 0; i < table->size; ++i) {
+        if (table->elements[i] != NULL) {
+            vx_hash_table_node_t* node = table->elements[i];
+
+            if (!node) {
+                continue;
+            }
+
+            vx_vertex_t* p = (vx_vertex_t*) node->data;
+            vx__add_voxel(outmesh, p, vertices);
+
+            while (node->next) {
+                node = node->next;
+                p = (vx_vertex_t*) node->data;
+                vx__add_voxel(outmesh, p, vertices);
+            }
+        }
+    }
+
+    vx__hash_table_free(table, true);
+
+    return outmesh;
+}
+
+#undef VOXELIZER_EPSILON
+#undef VOXELIZER_INDICES_SIZE
+#undef VOXELIZER_HASH_TABLE_SIZE
+
+#endif // VX_VOXELIZER_IMPLEMENTATION

experimental/multithreaded/README.md

@@ -0,0 +1,16 @@
+# Experimental code for .obj loader.
+
+* Multi-threaded optimized parser : tinyobj_loader_opt.h
+
+## Requirements
+
+* C++-11 compiler
+
+## Compile options
+
+* zstd compressed .obj support. `--with-zstd` premake option.
+* gzip compressed .obj support. `--with-zlib` premake option.
+
+## Licenses
+
+* lfpAlloc : MIT license.

experimental/multithreaded/lfpAlloc/Allocator.hpp

@@ -0,0 +1,89 @@
+#ifndef LF_POOL_ALLOCATOR
+#define LF_POOL_ALLOCATOR
+
+#include <memory>
+#include <thread>
+#include <lfpAlloc/PoolDispatcher.hpp>
+
+namespace lfpAlloc {
+template <typename T, std::size_t NumPools = 70>
+class lfpAllocator {
+public:
+    using value_type = T;
+    using pointer = T*;
+    using const_pointer = const T*;
+    using reference = T&;
+    using const_reference = T const&;
+
+    template <typename U>
+    struct rebind {
+        typedef lfpAllocator<U, NumPools> other;
+    };
+
+    lfpAllocator() {}
+
+    template <typename U>
+    lfpAllocator(lfpAllocator<U, NumPools>&&) noexcept {}
+
+    template <typename U>
+    lfpAllocator(const lfpAllocator<U, NumPools>&) noexcept {}
+
+    T* allocate(std::size_t count) {
+        if (sizeof(T) * count <=
+            alignof(std::max_align_t) * NumPools - sizeof(void*)) {
+            return reinterpret_cast<T*>(
+                dispatcher_.allocate(sizeof(T) * count));
+        } else {
+            return new T[count];
+        }
+    }
+
+    void deallocate(T* p, std::size_t count) noexcept {
+        if (sizeof(T) * count <=
+            alignof(std::max_align_t) * NumPools - sizeof(void*)) {
+            dispatcher_.deallocate(p, sizeof(T) * count);
+        } else {
+            delete[] p;
+        }
+    }
+
+    // Should not be required, but allocator_traits is not complete in
+    // gcc 4.9.1
+    template <typename U>
+    void destroy(U* p) {
+        p->~U();
+    }
+
+    template <typename U, typename... Args>
+    void construct(U* p, Args&&... args) {
+        new (p) U(std::forward<Args>(args)...);
+    }
+
+    template <typename Ty, typename U, std::size_t N, std::size_t M>
+    friend bool operator==(const lfpAllocator<Ty, N>&,
+                           const lfpAllocator<U, M>&) noexcept;
+
+    template <typename U, std::size_t M>
+    friend class lfpAllocator;
+
+private:
+    static PoolDispatcher<NumPools> dispatcher_;
+};
+
+template <typename T, std::size_t N>
+PoolDispatcher<N> lfpAllocator<T, N>::dispatcher_;
+
+template <typename T, typename U, std::size_t N, std::size_t M>
+inline bool operator==(const lfpAllocator<T, N>&,
+                       const lfpAllocator<U, M>&) noexcept {
+    return N == M;
+}
+
+template <typename T, typename U, std::size_t N, std::size_t M>
+inline bool operator!=(const lfpAllocator<T, N>& left,
+                       const lfpAllocator<U, M>& right) noexcept {
+    return !(left == right);
+}
+}
+
+#endif

experimental/multithreaded/lfpAlloc/ChunkList.hpp

@@ -0,0 +1,116 @@
+#ifndef LF_POOL_ALLOC_CHUNK_LIST
+#define LF_POOL_ALLOC_CHUNK_LIST
+
+#include <cstdint>
+#include <atomic>
+#include <type_traits>
+
+#ifndef LFP_ALLOW_BLOCKING
+static_assert(ATOMIC_POINTER_LOCK_FREE == 2,
+              "Atomic pointer is not lock-free.");
+#endif
+
+namespace lfpAlloc {
+
+template <std::size_t Size>
+struct Cell {
+    uint8_t val_[Size];
+    Cell* next_ = this + 1;
+};
+
+// For small types (less than the size of void*), no additional
+// space is needed, so union val_ with next_ to avoid overhead.
+template <>
+struct Cell<0> {
+    Cell() : next_{this + 1} {}
+    union {
+        uint8_t val_[sizeof(Cell*)];
+        Cell* next_;
+    };
+};
+
+template <std::size_t Size, std::size_t AllocationsPerChunk>
+struct Chunk {
+    Chunk() noexcept {
+        auto& last = memBlock_[AllocationsPerChunk - 1];
+        last.next_ = nullptr;
+    }
+    Cell<Size> memBlock_[AllocationsPerChunk];
+};
+
+template <typename T>
+struct Node {
+    Node() : val_(), next_(nullptr) {}
+    Node(const T& val) : val_(val), next_(nullptr) {}
+    T val_;
+    std::atomic<Node<T>*> next_;
+};
+
+template <std::size_t Size, std::size_t AllocationsPerChunk>
+class ChunkList {
+    static constexpr auto CellSize =
+        (Size > sizeof(void*)) ? Size - sizeof(void*) : 0;
+    using Chunk_t = Chunk<CellSize, AllocationsPerChunk>;
+    using Cell_t = Cell<CellSize>;
+
+    using ChunkNode = Node<Chunk_t>;
+    using CellNode = Node<Cell_t*>;
+
+public:
+    static ChunkList& getInstance() {
+        static ChunkList c;
+        return c;
+    }
+
+    Cell_t* allocateChain() {
+        CellNode* recentHead = head_.load();
+        CellNode* currentNext = nullptr;
+        do {
+            // If there are no available chains, allocate a new chunk
+            if (!recentHead) {
+                ChunkNode* currentHandle;
+
+                // Make a new node
+                auto newChunk = new ChunkNode();
+
+                // Add the chunk to the chain
+                do {
+                    currentHandle = handle_.load();
+                    newChunk->next_ = currentHandle;
+                } while (
+                    !handle_.compare_exchange_weak(currentHandle, newChunk));
+                return &newChunk->val_.memBlock_[0];
+            }
+
+            currentNext = recentHead->next_;
+        } while (!head_.compare_exchange_weak(recentHead, currentNext));
+
+        auto retnValue = recentHead->val_;
+        delete recentHead;
+        return retnValue;
+    }
+
+    void deallocateChain(Cell_t* newCell) {
+        if (!newCell) {
+            return;
+        }
+        CellNode* currentHead = head_.load();
+
+        // Construct a new node to be added to the linked list
+        CellNode* newHead = new CellNode(newCell);
+
+        // Add the chain to the linked list
+        do {
+            newHead->next_.store(currentHead, std::memory_order_release);
+        } while (!head_.compare_exchange_weak(currentHead, newHead));
+    }
+
+private:
+    ChunkList() : handle_(nullptr), head_(nullptr) {}
+
+    std::atomic<ChunkNode*> handle_;
+    std::atomic<CellNode*> head_;
+};
+}
+
+#endif

experimental/multithreaded/lfpAlloc/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Adam Schwalm
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

experimental/multithreaded/lfpAlloc/Pool.hpp

@@ -0,0 +1,48 @@
+#ifndef LF_POOL_ALLOC_POOL
+#define LF_POOL_ALLOC_POOL
+
+#include <lfpAlloc/Utils.hpp>
+#include <lfpAlloc/ChunkList.hpp>
+
+namespace lfpAlloc {
+template <std::size_t Size, std::size_t AllocationsPerChunk>
+class Pool {
+    using ChunkList_t = ChunkList<Size, AllocationsPerChunk>;
+
+public:
+    static constexpr auto CellSize =
+        (Size > sizeof(void*)) ? Size - sizeof(void*) : 0;
+    using Cell_t = Cell<CellSize>;
+
+    Pool() : head_(nullptr) {}
+
+    ~Pool() { ChunkList_t::getInstance().deallocateChain(head_); }
+
+    void* allocate() {
+        // Head loaded from head_
+        Cell_t* currentHead = head_;
+        Cell_t* next;
+
+        // Out of cells to allocate
+        if (!currentHead) {
+            currentHead = ChunkList_t::getInstance().allocateChain();
+        }
+
+        next = currentHead->next_;
+        head_ = next;
+        return &currentHead->val_;
+    }
+
+    void deallocate(void* p) noexcept {
+        auto newHead = reinterpret_cast<Cell_t*>(p);
+        Cell_t* currentHead = head_;
+        newHead->next_ = currentHead;
+        head_ = newHead;
+    }
+
+private:
+    Cell_t* head_;
+};
+}
+
+#endif

experimental/multithreaded/lfpAlloc/PoolDispatcher.hpp

@@ -0,0 +1,79 @@
+#ifndef LF_POOL_DISPATCHER
+#define LF_POOL_DISPATCHER
+
+#include <tuple>
+#include <cassert>
+#include <cstddef>
+#include <lfpAlloc/Pool.hpp>
+
+#ifndef LFP_ALLOCATIONS_PER_CHUNK
+#define LFP_ALLOCATIONS_PER_CHUNK 64 * 100
+#endif
+
+namespace lfpAlloc {
+namespace detail {
+
+template <std::size_t Num, uint16_t... Ts>
+struct Pools : Pools<Num - 1, alignof(std::max_align_t) * Num, Ts...> {};
+
+template <uint16_t... Size>
+struct Pools<0, Size...> {
+    using type = std::tuple<Pool<Size, LFP_ALLOCATIONS_PER_CHUNK>...>;
+};
+}
+
+template <std::size_t NumPools>
+class PoolDispatcher {
+public:
+    void* allocate(std::size_t size) { return dispatchAllocate<0>(size); }
+
+    void deallocate(void* p, std::size_t size) noexcept {
+        dispatchDeallocate<0>(p, size);
+    }
+
+private:
+    thread_local static typename detail::Pools<NumPools>::type pools_;
+    static_assert(NumPools > 0, "Invalid number of pools");
+
+    template <std::size_t Index>
+        typename std::enable_if <
+        Index<NumPools, void*>::type
+        dispatchAllocate(std::size_t const& requestSize) {
+        if (requestSize <= std::get<Index>(pools_).CellSize) {
+            return std::get<Index>(pools_).allocate();
+        } else {
+            return dispatchAllocate<Index + 1>(requestSize);
+        }
+    }
+
+    template <std::size_t Index>
+    typename std::enable_if<!(Index < NumPools), void*>::type
+    dispatchAllocate(std::size_t const&) {
+        assert(false && "Invalid allocation size.");
+        return nullptr;
+    }
+
+    template <std::size_t Index>
+        typename std::enable_if <
+        Index<NumPools>::type
+        dispatchDeallocate(void* p, std::size_t const& requestSize) noexcept {
+        if (requestSize <= std::get<Index>(pools_).CellSize) {
+            std::get<Index>(pools_).deallocate(p);
+        } else {
+            dispatchDeallocate<Index + 1>(p, requestSize);
+        }
+    }
+
+    template <std::size_t Index>
+    typename std::enable_if<!(Index < NumPools)>::type
+    dispatchDeallocate(void*, std::size_t const&) noexcept {
+        assert(false && "Invalid deallocation size.");
+    }
+};
+
+template <std::size_t NumPools>
+thread_local typename detail::Pools<NumPools>::type
+    PoolDispatcher<NumPools>::pools_;
+}
+
+#endif

experimental/multithreaded/lfpAlloc/Utils.hpp

@@ -0,0 +1,20 @@
+#include <cstdint>
+
+namespace lfpAlloc {
+namespace detail {
+template <std::size_t Val, std::size_t base = 2>
+struct Log {
+    enum { value = 1 + Log<Val / base, base>::value };
+};
+
+template <std::size_t base>
+struct Log<1, base> {
+    enum { value = 0 };
+};
+
+template <std::size_t base>
+struct Log<0, base> {
+    enum { value = 0 };
+};
+}
+}

experimental/multithreaded/premake5.lua

@@ -0,0 +1,94 @@
+newoption {
+   trigger     = "with-zlib",
+   description = "Build with zlib."
+}
+
+newoption {
+   trigger     = "with-zstd",
+   description = "Build with ZStandard compression."
+}
+
+newoption {
+   trigger     = "clang",
+   description = "Use clang compiler."
+}
+
+newoption {
+   trigger     = "asan",
+   description = "Enable AddressSanitizer(gcc or clang only)."
+}
+
+solution "objview"
+	-- location ( "build" )
+	configurations { "Release", "Debug" }
+	platforms {"native", "x64", "x32"}
+	
+	project "objview"
+
+	kind "ConsoleApp"
+	language "C++"
+	files { "viewer.cc", "trackball.cc" }
+	includedirs { "./" }
+	includedirs { "../../" }
+
+	flags { "c++11" }
+
+        if _OPTIONS['clang'] then
+           toolset "clang"
+        end
+
+	if _OPTIONS['with-zlib'] then
+		defines { 'ENABLE_ZLIB' }
+		links { 'z' }
+	end	
+
+	if _OPTIONS['asan'] then
+		buildoptions { '-fsanitize=address' }
+		linkoptions { '-fsanitize=address' }
+	end	
+
+	if _OPTIONS['with-zstd'] then
+		print("with-zstd")
+		defines { 'ENABLE_ZSTD' }
+		-- Set path to zstd installed dir.
+		includedirs { '$$HOME/local/include' }
+		libdirs { '$$HOME/local/lib' }
+		links { 'zstd' }
+	end	
+
+	-- Uncomment if you want address sanitizer(gcc/clang only)
+	--buildoptions { "-fsanitize=address" }
+	--linkoptions { "-fsanitize=address" }
+
+	configuration { "linux" }
+		linkoptions { "`pkg-config --libs glfw3`" }
+		links { "GL", "GLU", "m", "GLEW", "X11", "Xrandr", "Xinerama", "Xi", "Xxf86vm", "Xcursor", "dl" }
+		linkoptions { "-pthread" }
+
+	configuration { "windows" }
+		-- Path to GLFW3
+		includedirs { '../../../local/glfw-3.2.bin.WIN64/include' }
+		libdirs { '../../../local/glfw-3.2.bin.WIN64/lib-vc2015' }
+		-- Path to GLEW
+		includedirs { '../../../local/glew-1.13.0/include' }
+		libdirs { '../../../local/glew-1.13.0/lib/Release/x64' }
+
+		links { "glfw3", "glew32", "gdi32", "winmm", "user32", "glu32","opengl32", "kernel32" }
+		defines { "_CRT_SECURE_NO_WARNINGS" }
+		defines { "NOMINMAX" }
+
+	configuration { "macosx" }
+		includedirs { "/usr/local/include" }
+		buildoptions { "-Wno-deprecated-declarations" }
+		libdirs { "/usr/local/lib" }
+		links { "glfw3", "GLEW" }
+		linkoptions { "-framework OpenGL", "-framework Cocoa", "-framework IOKit", "-framework CoreVideo" }
+
+	configuration "Debug"
+		defines { "DEBUG" }
+		flags { "Symbols"}
+
+	configuration "Release"
+		defines { "NDEBUG" }
+		flags { "Optimize"}
+

experimental/multithreaded/trackball.cc

@@ -0,0 +1,292 @@
+/*
+ * (c) Copyright 1993, 1994, Silicon Graphics, Inc.
+ * ALL RIGHTS RESERVED
+ * Permission to use, copy, modify, and distribute this software for
+ * any purpose and without fee is hereby granted, provided that the above
+ * copyright notice appear in all copies and that both the copyright notice
+ * and this permission notice appear in supporting documentation, and that
+ * the name of Silicon Graphics, Inc. not be used in advertising
+ * or publicity pertaining to distribution of the software without specific,
+ * written prior permission.
+ *
+ * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
+ * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
+ * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
+ * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
+ * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
+ * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
+ * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
+ * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
+ * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
+ * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * US Government Users Restricted Rights
+ * Use, duplication, or disclosure by the Government is subject to
+ * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
+ * (c)(1)(ii) of the Rights in Technical Data and Computer Software
+ * clause at DFARS 252.227-7013 and/or in similar or successor
+ * clauses in the FAR or the DOD or NASA FAR Supplement.
+ * Unpublished-- rights reserved under the copyright laws of the
+ * United States.  Contractor/manufacturer is Silicon Graphics,
+ * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
+ *
+ * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
+ */
+/*
+ * Trackball code:
+ *
+ * Implementation of a virtual trackball.
+ * Implemented by Gavin Bell, lots of ideas from Thant Tessman and
+ *   the August '88 issue of Siggraph's "Computer Graphics," pp. 121-129.
+ *
+ * Vector manip code:
+ *
+ * Original code from:
+ * David M. Ciemiewicz, Mark Grossman, Henry Moreton, and Paul Haeberli
+ *
+ * Much mucking with by:
+ * Gavin Bell
+ */
+#include <math.h>
+#include "trackball.h"
+
+/*
+ * This size should really be based on the distance from the center of
+ * rotation to the point on the object underneath the mouse.  That
+ * point would then track the mouse as closely as possible.  This is a
+ * simple example, though, so that is left as an Exercise for the
+ * Programmer.
+ */
+#define TRACKBALLSIZE (0.8)
+
+/*
+ * Local function prototypes (not defined in trackball.h)
+ */
+static float tb_project_to_sphere(float, float, float);
+static void normalize_quat(float[4]);
+
+static void vzero(float *v) {
+  v[0] = 0.0;
+  v[1] = 0.0;
+  v[2] = 0.0;
+}
+
+static void vset(float *v, float x, float y, float z) {
+  v[0] = x;
+  v[1] = y;
+  v[2] = z;
+}
+
+static void vsub(const float *src1, const float *src2, float *dst) {
+  dst[0] = src1[0] - src2[0];
+  dst[1] = src1[1] - src2[1];
+  dst[2] = src1[2] - src2[2];
+}
+
+static void vcopy(const float *v1, float *v2) {
+  int i;
+  for (i = 0; i < 3; i++)
+    v2[i] = v1[i];
+}
+
+static void vcross(const float *v1, const float *v2, float *cross) {
+  float temp[3];
+
+  temp[0] = (v1[1] * v2[2]) - (v1[2] * v2[1]);
+  temp[1] = (v1[2] * v2[0]) - (v1[0] * v2[2]);
+  temp[2] = (v1[0] * v2[1]) - (v1[1] * v2[0]);
+  vcopy(temp, cross);
+}
+
+static float vlength(const float *v) {
+  return sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]);
+}
+
+static void vscale(float *v, float div) {
+  v[0] *= div;
+  v[1] *= div;
+  v[2] *= div;
+}
+
+static void vnormal(float *v) { vscale(v, 1.0 / vlength(v)); }
+
+static float vdot(const float *v1, const float *v2) {
+  return v1[0] * v2[0] + v1[1] * v2[1] + v1[2] * v2[2];
+}
+
+static void vadd(const float *src1, const float *src2, float *dst) {
+  dst[0] = src1[0] + src2[0];
+  dst[1] = src1[1] + src2[1];
+  dst[2] = src1[2] + src2[2];
+}
+
+/*
+ * Ok, simulate a track-ball.  Project the points onto the virtual
+ * trackball, then figure out the axis of rotation, which is the cross
+ * product of P1 P2 and O P1 (O is the center of the ball, 0,0,0)
+ * Note:  This is a deformed trackball-- is a trackball in the center,
+ * but is deformed into a hyperbolic sheet of rotation away from the
+ * center.  This particular function was chosen after trying out
+ * several variations.
+ *
+ * It is assumed that the arguments to this routine are in the range
+ * (-1.0 ... 1.0)
+ */
+void trackball(float q[4], float p1x, float p1y, float p2x, float p2y) {
+  float a[3]; /* Axis of rotation */
+  float phi;  /* how much to rotate about axis */
+  float p1[3], p2[3], d[3];
+  float t;
+
+  if (p1x == p2x && p1y == p2y) {
+    /* Zero rotation */
+    vzero(q);
+    q[3] = 1.0;
+    return;
+  }
+
+  /*
+   * First, figure out z-coordinates for projection of P1 and P2 to
+   * deformed sphere
+   */
+  vset(p1, p1x, p1y, tb_project_to_sphere(TRACKBALLSIZE, p1x, p1y));
+  vset(p2, p2x, p2y, tb_project_to_sphere(TRACKBALLSIZE, p2x, p2y));
+
+  /*
+   *  Now, we want the cross product of P1 and P2
+   */
+  vcross(p2, p1, a);
+
+  /*
+   *  Figure out how much to rotate around that axis.
+   */
+  vsub(p1, p2, d);
+  t = vlength(d) / (2.0 * TRACKBALLSIZE);
+
+  /*
+   * Avoid problems with out-of-control values...
+   */
+  if (t > 1.0)
+    t = 1.0;
+  if (t < -1.0)
+    t = -1.0;
+  phi = 2.0 * asin(t);
+
+  axis_to_quat(a, phi, q);
+}
+
+/*
+ *  Given an axis and angle, compute quaternion.
+ */
+void axis_to_quat(float a[3], float phi, float q[4]) {
+  vnormal(a);
+  vcopy(a, q);
+  vscale(q, sin(phi / 2.0));
+  q[3] = cos(phi / 2.0);
+}
+
+/*
+ * Project an x,y pair onto a sphere of radius r OR a hyperbolic sheet
+ * if we are away from the center of the sphere.
+ */
+static float tb_project_to_sphere(float r, float x, float y) {
+  float d, t, z;
+
+  d = sqrt(x * x + y * y);
+  if (d < r * 0.70710678118654752440) { /* Inside sphere */
+    z = sqrt(r * r - d * d);
+  } else { /* On hyperbola */
+    t = r / 1.41421356237309504880;
+    z = t * t / d;
+  }
+  return z;
+}
+
+/*
+ * Given two rotations, e1 and e2, expressed as quaternion rotations,
+ * figure out the equivalent single rotation and stuff it into dest.
+ *
+ * This routine also normalizes the result every RENORMCOUNT times it is
+ * called, to keep error from creeping in.
+ *
+ * NOTE: This routine is written so that q1 or q2 may be the same
+ * as dest (or each other).
+ */
+
+#define RENORMCOUNT 97
+
+void add_quats(float q1[4], float q2[4], float dest[4]) {
+  static int count = 0;
+  float t1[4], t2[4], t3[4];
+  float tf[4];
+
+  vcopy(q1, t1);
+  vscale(t1, q2[3]);
+
+  vcopy(q2, t2);
+  vscale(t2, q1[3]);
+
+  vcross(q2, q1, t3);
+  vadd(t1, t2, tf);
+  vadd(t3, tf, tf);
+  tf[3] = q1[3] * q2[3] - vdot(q1, q2);
+
+  dest[0] = tf[0];
+  dest[1] = tf[1];
+  dest[2] = tf[2];
+  dest[3] = tf[3];
+
+  if (++count > RENORMCOUNT) {
+    count = 0;
+    normalize_quat(dest);
+  }
+}
+
+/*
+ * Quaternions always obey:  a^2 + b^2 + c^2 + d^2 = 1.0
+ * If they don't add up to 1.0, dividing by their magnitued will
+ * renormalize them.
+ *
+ * Note: See the following for more information on quaternions:
+ *
+ * - Shoemake, K., Animating rotation with quaternion curves, Computer
+ *   Graphics 19, No 3 (Proc. SIGGRAPH'85), 245-254, 1985.
+ * - Pletinckx, D., Quaternion calculus as a basic tool in computer
+ *   graphics, The Visual Computer 5, 2-13, 1989.
+ */
+static void normalize_quat(float q[4]) {
+  int i;
+  float mag;
+
+  mag = (q[0] * q[0] + q[1] * q[1] + q[2] * q[2] + q[3] * q[3]);
+  for (i = 0; i < 4; i++)
+    q[i] /= mag;
+}
+
+/*
+ * Build a rotation matrix, given a quaternion rotation.
+ *
+ */
+void build_rotmatrix(float m[4][4], const float q[4]) {
+  m[0][0] = 1.0 - 2.0 * (q[1] * q[1] + q[2] * q[2]);
+  m[0][1] = 2.0 * (q[0] * q[1] - q[2] * q[3]);
+  m[0][2] = 2.0 * (q[2] * q[0] + q[1] * q[3]);
+  m[0][3] = 0.0;
+
+  m[1][0] = 2.0 * (q[0] * q[1] + q[2] * q[3]);
+  m[1][1] = 1.0 - 2.0 * (q[2] * q[2] + q[0] * q[0]);
+  m[1][2] = 2.0 * (q[1] * q[2] - q[0] * q[3]);
+  m[1][3] = 0.0;
+
+  m[2][0] = 2.0 * (q[2] * q[0] - q[1] * q[3]);
+  m[2][1] = 2.0 * (q[1] * q[2] + q[0] * q[3]);
+  m[2][2] = 1.0 - 2.0 * (q[1] * q[1] + q[0] * q[0]);
+  m[2][3] = 0.0;
+
+  m[3][0] = 0.0;
+  m[3][1] = 0.0;
+  m[3][2] = 0.0;
+  m[3][3] = 1.0;
+}

experimental/multithreaded/trackball.h

@@ -0,0 +1,75 @@
+/*
+ * (c) Copyright 1993, 1994, Silicon Graphics, Inc.
+ * ALL RIGHTS RESERVED
+ * Permission to use, copy, modify, and distribute this software for
+ * any purpose and without fee is hereby granted, provided that the above
+ * copyright notice appear in all copies and that both the copyright notice
+ * and this permission notice appear in supporting documentation, and that
+ * the name of Silicon Graphics, Inc. not be used in advertising
+ * or publicity pertaining to distribution of the software without specific,
+ * written prior permission.
+ *
+ * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
+ * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
+ * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
+ * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
+ * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
+ * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
+ * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
+ * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
+ * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
+ * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * US Government Users Restricted Rights
+ * Use, duplication, or disclosure by the Government is subject to
+ * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
+ * (c)(1)(ii) of the Rights in Technical Data and Computer Software
+ * clause at DFARS 252.227-7013 and/or in similar or successor
+ * clauses in the FAR or the DOD or NASA FAR Supplement.
+ * Unpublished-- rights reserved under the copyright laws of the
+ * United States.  Contractor/manufacturer is Silicon Graphics,
+ * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
+ *
+ * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
+ */
+/*
+ * trackball.h
+ * A virtual trackball implementation
+ * Written by Gavin Bell for Silicon Graphics, November 1988.
+ */
+
+/*
+ * Pass the x and y coordinates of the last and current positions of
+ * the mouse, scaled so they are from (-1.0 ... 1.0).
+ *
+ * The resulting rotation is returned as a quaternion rotation in the
+ * first paramater.
+ */
+void trackball(float q[4], float p1x, float p1y, float p2x, float p2y);
+
+void negate_quat(float *q, float *qn);
+
+/*
+ * Given two quaternions, add them together to get a third quaternion.
+ * Adding quaternions to get a compound rotation is analagous to adding
+ * translations to get a compound translation.  When incrementally
+ * adding rotations, the first argument here should be the new
+ * rotation, the second and third the total rotation (which will be
+ * over-written with the resulting new total rotation).
+ */
+void add_quats(float *q1, float *q2, float *dest);
+
+/*
+ * A useful function, builds a rotation matrix in Matrix based on
+ * given quaternion.
+ */
+void build_rotmatrix(float m[4][4], const float q[4]);
+
+/*
+ * This function computes a quaternion based on an axis (defined by
+ * the given vector) and an angle about which to rotate.  The angle is
+ * expressed in radians.  The result is put into the third argument.
+ */
+void axis_to_quat(float a[3], float phi, float q[4]);

experimental/multithreaded/viewer.cc

@@ -0,0 +1,748 @@
+//
+// Simple .obj viewer(vertex only)
+//
+#include <vector>
+#include <string>
+#include <cstdio>
+#include <cstdlib>
+#include <iostream>
+#include <limits>
+#include <cmath>
+#include <cassert>
+#include <cstring>	
+#include <algorithm>	
+
+#if defined(ENABLE_ZLIB)
+#include <zlib.h>
+#endif
+
+#if defined(ENABLE_ZSTD)
+#include <zstd.h>
+#endif
+
+#include <GL/glew.h>
+
+#ifdef __APPLE__
+#include <OpenGL/glu.h>
+#else
+#include <GL/glu.h>
+#endif
+
+#include <GLFW/glfw3.h>
+
+#include "trackball.h"
+
+#define TINYOBJ_LOADER_OPT_IMPLEMENTATION
+#include "tinyobj_loader_opt.h"
+
+typedef struct {
+  GLuint vb;    // vertex buffer
+  int numTriangles;
+} DrawObject;
+
+std::vector<DrawObject> gDrawObjects;
+
+int width = 768;
+int height = 768;
+
+double prevMouseX, prevMouseY;
+bool mouseLeftPressed;
+bool mouseMiddlePressed;
+bool mouseRightPressed;
+float curr_quat[4];
+float prev_quat[4];
+float eye[3], lookat[3], up[3];
+
+GLFWwindow* window;
+
+void CheckErrors(std::string desc) {
+  GLenum e = glGetError();
+  if (e != GL_NO_ERROR) {
+    fprintf(stderr, "OpenGL error in \"%s\": %d (%d)\n", desc.c_str(), e, e);
+    exit(20);
+  }
+}
+
+void CalcNormal(float N[3], float v0[3], float v1[3], float v2[3]) {
+  float v10[3];
+  v10[0] = v1[0] - v0[0];
+  v10[1] = v1[1] - v0[1];
+  v10[2] = v1[2] - v0[2];
+
+  float v20[3];
+  v20[0] = v2[0] - v0[0];
+  v20[1] = v2[1] - v0[1];
+  v20[2] = v2[2] - v0[2];
+
+  N[0] = v20[1] * v10[2] - v20[2] * v10[1];
+  N[1] = v20[2] * v10[0] - v20[0] * v10[2];
+  N[2] = v20[0] * v10[1] - v20[1] * v10[0];
+
+  float len2 = N[0] * N[0] + N[1] * N[1] + N[2] * N[2];
+  if (len2 > 0.0f) {
+    float len = sqrtf(len2);
+    
+    N[0] /= len;
+    N[1] /= len;
+  }
+}
+
+const char *mmap_file(size_t *len, const char* filename)
+{
+  (*len) = 0;
+#ifdef _WIN32
+  HANDLE file = CreateFileA(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
+  assert(file != INVALID_HANDLE_VALUE);
+
+  HANDLE fileMapping = CreateFileMapping(file, NULL, PAGE_READONLY, 0, 0, NULL);
+  assert(fileMapping != INVALID_HANDLE_VALUE);
+ 
+  LPVOID fileMapView = MapViewOfFile(fileMapping, FILE_MAP_READ, 0, 0, 0);
+  auto fileMapViewChar = (const char*)fileMapView;
+  assert(fileMapView != NULL);
+
+  LARGE_INTEGER fileSize;
+  fileSize.QuadPart = 0;
+  GetFileSizeEx(file, &fileSize);
+
+  (*len) = static_cast<size_t>(fileSize.QuadPart);
+  return fileMapViewChar;
+
+#else
+
+  FILE* f = fopen(filename, "rb" );
+  if (!f) {
+    fprintf(stderr, "Failed to open file : %s\n", filename);
+    return nullptr;
+  }
+  fseek(f, 0, SEEK_END);
+  long fileSize = ftell(f);
+  fclose(f);
+
+  if (fileSize < 16) {
+    fprintf(stderr, "Empty or invalid .obj : %s\n", filename);
+    return nullptr;
+  }
+
+  struct stat sb;
+  char *p;
+  int fd;
+
+  fd = open (filename, O_RDONLY);
+  if (fd == -1) {
+    perror ("open");
+    return nullptr;
+  }
+
+  if (fstat (fd, &sb) == -1) {
+    perror ("fstat");
+    return nullptr;
+  }
+
+  if (!S_ISREG (sb.st_mode)) {
+    fprintf (stderr, "%s is not a file\n", "lineitem.tbl");
+    return nullptr;
+  }
+
+  p = (char*)mmap (0, fileSize, PROT_READ, MAP_SHARED, fd, 0);
+
+  if (p == MAP_FAILED) {
+    perror ("mmap");
+    return nullptr;
+  }
+
+  if (close (fd) == -1) {
+    perror ("close");
+    return nullptr;
+  }
+
+  (*len) = fileSize;
+
+  return p;
+  
+#endif
+}
+
+bool gz_load(std::vector<char>* buf, const char* filename)
+{
+#ifdef ENABLE_ZLIB
+    gzFile file;
+    file = gzopen (filename, "r");
+    if (! file) {
+        fprintf (stderr, "gzopen of '%s' failed: %s.\n", filename,
+                 strerror (errno));
+        exit (EXIT_FAILURE);
+        return false;
+    }
+    while (1) {
+        int err;                    
+        int bytes_read;
+        unsigned char buffer[1024];
+        bytes_read = gzread (file, buffer, 1024);
+        buf->insert(buf->end(), buffer, buffer + 1024); 
+        //printf ("%s", buffer);
+        if (bytes_read < 1024) {
+            if (gzeof (file)) {
+                break;
+            }
+            else {
+                const char * error_string;
+                error_string = gzerror (file, & err);
+                if (err) {
+                    fprintf (stderr, "Error: %s.\n", error_string);
+                    exit (EXIT_FAILURE);
+                    return false;
+                }
+            }
+        }
+    }
+    gzclose (file);
+    return true;
+#else
+  return false;
+#endif
+}
+
+#ifdef ENABLE_ZSTD
+static off_t fsize_X(const char *filename)
+{
+    struct stat st;
+    if (stat(filename, &st) == 0) return st.st_size;
+    /* error */
+    printf("stat: %s : %s \n", filename, strerror(errno));
+    exit(1);
+}
+
+static FILE* fopen_X(const char *filename, const char *instruction)
+{
+    FILE* const inFile = fopen(filename, instruction);
+    if (inFile) return inFile;
+    /* error */
+    printf("fopen: %s : %s \n", filename, strerror(errno));
+    exit(2);
+}
+
+static void* malloc_X(size_t size)
+{
+    void* const buff = malloc(size);
+    if (buff) return buff;
+    /* error */
+    printf("malloc: %s \n", strerror(errno));
+    exit(3);
+}
+#endif
+
+bool zstd_load(std::vector<char>* buf, const char* filename)
+{
+#ifdef ENABLE_ZSTD
+    off_t const buffSize = fsize_X(filename);
+    FILE* const inFile = fopen_X(filename, "rb");
+    void* const buffer = malloc_X(buffSize);
+    size_t const readSize = fread(buffer, 1, buffSize, inFile);
+    if (readSize != (size_t)buffSize) {
+        printf("fread: %s : %s \n", filename, strerror(errno));
+        exit(4);
+    }
+    fclose(inFile);
+
+    unsigned long long const rSize = ZSTD_getDecompressedSize(buffer, buffSize);
+    if (rSize==0) {
+        printf("%s : original size unknown \n", filename);
+        exit(5);
+    }
+
+    buf->resize(rSize);
+
+    size_t const dSize = ZSTD_decompress(buf->data(), rSize, buffer, buffSize);
+
+    if (dSize != rSize) {
+        printf("error decoding %s : %s \n", filename, ZSTD_getErrorName(dSize));
+        exit(7);
+    }
+
+    free(buffer);
+
+    return true;
+#else
+  return false;
+#endif
+}
+
+const char* get_file_data(size_t *len, const char* filename)
+{
+
+  const char *ext = strrchr(filename, '.');
+
+  size_t data_len = 0;
+  const char* data = nullptr;
+
+  if (strcmp(ext, ".gz") == 0) {
+    // gzipped data.
+
+    std::vector<char> buf;
+    bool ret = gz_load(&buf, filename);
+
+    if (ret) {
+      char *p = static_cast<char*>(malloc(buf.size() + 1));  // @fixme { implement deleter }
+      memcpy(p, &buf.at(0), buf.size());
+      p[buf.size()] = '\0';
+      data = p;
+      data_len = buf.size();
+    }
+
+  } else if (strcmp(ext, ".zst") == 0) {
+    printf("zstd\n");
+    // Zstandard data.
+
+    std::vector<char> buf;
+    bool ret = zstd_load(&buf, filename);
+
+    if (ret) {
+      char *p = static_cast<char*>(malloc(buf.size() + 1));  // @fixme { implement deleter }
+      memcpy(p, &buf.at(0), buf.size());
+      p[buf.size()] = '\0';
+      data = p;
+      data_len = buf.size();
+    }
+  } else {
+    
+    data = mmap_file(&data_len, filename);
+
+  }
+
+  (*len) = data_len;
+  return data;
+}
+
+
+bool LoadObjAndConvert(float bmin[3], float bmax[3], const char* filename, int num_threads, bool verbose)
+{
+  tinyobj_opt::attrib_t attrib;
+  std::vector<tinyobj_opt::shape_t> shapes;
+  std::vector<tinyobj_opt::material_t> materials;
+
+  auto load_t_begin = std::chrono::high_resolution_clock::now();
+  size_t data_len = 0;
+  const char* data = get_file_data(&data_len, filename);
+  if (data == nullptr) {
+    printf("failed to load file\n");
+    exit(-1);
+    return false;
+  }
+  auto load_t_end = std::chrono::high_resolution_clock::now();
+  std::chrono::duration<double, std::milli> load_ms = load_t_end - load_t_begin;
+  if (verbose) {
+    std::cout << "filesize: " << data_len << std::endl;
+    std::cout << "load time: " << load_ms.count() << " [msecs]" << std::endl;
+  }
+
+
+  tinyobj_opt::LoadOption option;
+  option.req_num_threads = num_threads;
+  option.verbose = verbose;
+  bool ret = parseObj(&attrib, &shapes, &materials, data, data_len, option);
+
+  if (!ret) {
+	  std::cerr << "Failed to parse .obj" << std::endl;
+	  return false;
+  }
+  bmin[0] = bmin[1] = bmin[2] = std::numeric_limits<float>::max();
+  bmax[0] = bmax[1] = bmax[2] = -std::numeric_limits<float>::max();
+
+  //std::cout << "vertices.size() = " << attrib.vertices.size() << std::endl;
+  //std::cout << "normals.size() = " << attrib.normals.size() << std::endl;
+
+  {
+        DrawObject o;
+        std::vector<float> vb; // pos(3float), normal(3float), color(3float)
+        size_t face_offset = 0;
+        for (size_t v = 0; v < attrib.face_num_verts.size(); v++) {
+          assert(attrib.face_num_verts[v] % 3 == 0); // assume all triangle face.
+          for (size_t f = 0; f < attrib.face_num_verts[v] / 3; f++) {
+            tinyobj_opt::index_t idx0 = attrib.indices[face_offset+3*f+0];
+            tinyobj_opt::index_t idx1 = attrib.indices[face_offset+3*f+1];
+            tinyobj_opt::index_t idx2 = attrib.indices[face_offset+3*f+2];
+
+            float v[3][3];
+            for (int k = 0; k < 3; k++) {
+              int f0 = idx0.vertex_index;
+              int f1 = idx1.vertex_index;
+              int f2 = idx2.vertex_index;
+              assert(f0 >= 0);
+              assert(f1 >= 0);
+              assert(f2 >= 0);
+
+              v[0][k] = attrib.vertices[3*f0+k];
+              v[1][k] = attrib.vertices[3*f1+k];
+              v[2][k] = attrib.vertices[3*f2+k];
+              bmin[k] = std::min(v[0][k], bmin[k]);
+              bmin[k] = std::min(v[1][k], bmin[k]);
+              bmin[k] = std::min(v[2][k], bmin[k]);
+              bmax[k] = std::max(v[0][k], bmax[k]);
+              bmax[k] = std::max(v[1][k], bmax[k]);
+              bmax[k] = std::max(v[2][k], bmax[k]);
+            }
+
+            float n[3][3];
+
+            if (attrib.normals.size() > 0) { 
+              int nf0 = idx0.normal_index;
+              int nf1 = idx1.normal_index;
+              int nf2 = idx2.normal_index;
+
+              if (nf0 >= 0 && nf1 >= 0 && nf2 >= 0) {
+                assert(3*nf0+2 < attrib.normals.size());
+                assert(3*nf1+2 < attrib.normals.size());
+                assert(3*nf2+2 < attrib.normals.size());
+                for (int k = 0; k < 3; k++) {
+                  n[0][k] = attrib.normals[3*nf0+k];
+                  n[1][k] = attrib.normals[3*nf1+k];
+                  n[2][k] = attrib.normals[3*nf2+k];
+                }
+              } else {
+                // compute geometric normal
+                CalcNormal(n[0], v[0], v[1], v[2]);
+                n[1][0] = n[0][0]; n[1][1] = n[0][1]; n[1][2] = n[0][2];
+                n[2][0] = n[0][0]; n[2][1] = n[0][1]; n[2][2] = n[0][2];
+              }
+            } else {
+              // compute geometric normal
+              CalcNormal(n[0], v[0], v[1], v[2]);
+              n[1][0] = n[0][0]; n[1][1] = n[0][1]; n[1][2] = n[0][2];
+              n[2][0] = n[0][0]; n[2][1] = n[0][1]; n[2][2] = n[0][2];
+            }
+
+            for (int k = 0; k < 3; k++) {
+              vb.push_back(v[k][0]);
+              vb.push_back(v[k][1]);
+              vb.push_back(v[k][2]);
+              vb.push_back(n[k][0]);
+              vb.push_back(n[k][1]);
+              vb.push_back(n[k][2]);
+              // Use normal as color.
+              float c[3] = {n[k][0], n[k][1], n[k][2]};
+              float len2 = c[0] * c[0] + c[1] * c[1] + c[2] * c[2];
+              if (len2 > 1.0e-6f) {
+                float len = sqrtf(len2);
+                
+                c[0] /= len;
+                c[1] /= len;
+                c[2] /= len;
+              }
+              vb.push_back(c[0] * 0.5 + 0.5);
+              vb.push_back(c[1] * 0.5 + 0.5);
+              vb.push_back(c[2] * 0.5 + 0.5);
+            }
+          } 
+          face_offset += attrib.face_num_verts[v];
+        }
+
+        o.vb = 0;
+        o.numTriangles = 0;
+        if (vb.size() > 0) {
+          glGenBuffers(1, &o.vb);
+          glBindBuffer(GL_ARRAY_BUFFER, o.vb);
+          glBufferData(GL_ARRAY_BUFFER, vb.size() * sizeof(float), &vb.at(0), GL_STATIC_DRAW);
+          o.numTriangles = vb.size() / 9 / 3;
+        }
+
+        gDrawObjects.push_back(o);
+  }
+  
+  printf("bmin = %f, %f, %f\n", bmin[0], bmin[1], bmin[2]);
+  printf("bmax = %f, %f, %f\n", bmax[0], bmax[1], bmax[2]);
+
+  return true;
+}
+
+void reshapeFunc(GLFWwindow* window, int w, int h)
+{
+  (void)window;
+  // for retinal display.
+  int fb_w, fb_h;
+  glfwGetFramebufferSize(window, &fb_w, &fb_h);
+
+  glViewport(0, 0, fb_w, fb_h);
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+  gluPerspective(45.0, (float)w / (float)h, 0.01f, 100.0f);
+  glMatrixMode(GL_MODELVIEW);
+  glLoadIdentity();
+
+  width = w;
+  height = h;
+}
+
+void keyboardFunc(GLFWwindow *window, int key, int scancode, int action, int mods) {
+  (void)window;
+  (void)scancode;
+  (void)mods;
+    if(action == GLFW_PRESS || action == GLFW_REPEAT){
+        // Move camera
+        float mv_x = 0, mv_y = 0, mv_z = 0;
+        if(key == GLFW_KEY_K) mv_x += 1;
+        else if(key == GLFW_KEY_J) mv_x += -1;
+        else if(key == GLFW_KEY_L) mv_y += 1;
+        else if(key == GLFW_KEY_H) mv_y += -1;
+        else if(key == GLFW_KEY_P) mv_z += 1;
+        else if(key == GLFW_KEY_N) mv_z += -1;
+        //camera.move(mv_x * 0.05, mv_y * 0.05, mv_z * 0.05);
+        // Close window
+        if(key == GLFW_KEY_Q || key == GLFW_KEY_ESCAPE) glfwSetWindowShouldClose(window, GL_TRUE);
+
+        //init_frame = true;
+    }
+}
+
+void clickFunc(GLFWwindow* window, int button, int action, int mods){
+  (void)window;
+  (void)mods;
+    if(button == GLFW_MOUSE_BUTTON_LEFT){
+        if(action == GLFW_PRESS){
+            mouseLeftPressed = true;
+            trackball(prev_quat, 0.0, 0.0, 0.0, 0.0);
+        } else if(action == GLFW_RELEASE){
+            mouseLeftPressed = false;
+        }
+    }
+    if(button == GLFW_MOUSE_BUTTON_RIGHT){
+        if(action == GLFW_PRESS){
+            mouseRightPressed = true;
+        } else if(action == GLFW_RELEASE){
+            mouseRightPressed = false;
+        }
+    }
+    if(button == GLFW_MOUSE_BUTTON_MIDDLE){
+        if(action == GLFW_PRESS){
+            mouseMiddlePressed = true;
+        } else if(action == GLFW_RELEASE){
+            mouseMiddlePressed = false;
+        }
+    }
+}
+
+void motionFunc(GLFWwindow* window, double mouse_x, double mouse_y){
+  (void)window;
+  float rotScale = 1.0f;
+  float transScale = 2.0f;
+
+    if(mouseLeftPressed){
+      trackball(prev_quat,
+          rotScale * (2.0f * prevMouseX - width) / (float)width,
+          rotScale * (height - 2.0f * prevMouseY) / (float)height,
+          rotScale * (2.0f * mouse_x - width) / (float)width,
+          rotScale * (height - 2.0f * mouse_y) / (float)height);
+
+      add_quats(prev_quat, curr_quat, curr_quat);
+    } else if (mouseMiddlePressed) {
+      eye[0] -= transScale * (mouse_x - prevMouseX) / (float)width;
+      lookat[0] -= transScale * (mouse_x - prevMouseX) / (float)width;
+      eye[1] += transScale * (mouse_y - prevMouseY) / (float)height;
+      lookat[1] += transScale * (mouse_y - prevMouseY) / (float)height;
+    } else if (mouseRightPressed) {
+      eye[2] += transScale * (mouse_y - prevMouseY) / (float)height;
+      lookat[2] += transScale * (mouse_y - prevMouseY) / (float)height;
+    }
+
+    // Update mouse point
+    prevMouseX = mouse_x;
+    prevMouseY = mouse_y;
+}
+
+void Draw(const std::vector<DrawObject>& drawObjects)
+{
+  glPolygonMode(GL_FRONT, GL_FILL);
+  glPolygonMode(GL_BACK, GL_FILL);
+
+  glEnable(GL_POLYGON_OFFSET_FILL);
+  glPolygonOffset(1.0, 1.0);
+  glColor3f(1.0f, 1.0f, 1.0f);
+  for (size_t i = 0; i < drawObjects.size(); i++) {
+    DrawObject o = drawObjects[i];
+    if (o.vb < 1) {
+      continue;
+    }
+ 
+    glBindBuffer(GL_ARRAY_BUFFER, o.vb);
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_NORMAL_ARRAY);
+    glEnableClientState(GL_COLOR_ARRAY);
+    glVertexPointer(3, GL_FLOAT, 36, (const void*)0);
+    glNormalPointer(GL_FLOAT, 36, (const void*)(sizeof(float)*3));
+    glColorPointer(3, GL_FLOAT, 36, (const void*)(sizeof(float)*6));
+
+    glDrawArrays(GL_TRIANGLES, 0, 3 * o.numTriangles);
+    CheckErrors("drawarrays");
+  }
+
+  // draw wireframe
+  glDisable(GL_POLYGON_OFFSET_FILL);
+  glPolygonMode(GL_FRONT, GL_LINE);
+  glPolygonMode(GL_BACK, GL_LINE);
+
+  glColor3f(0.0f, 0.0f, 0.4f);
+  for (size_t i = 0; i < drawObjects.size(); i++) {
+    DrawObject o = drawObjects[i];
+    if (o.vb < 1) {
+      continue;
+    }
+ 
+    glBindBuffer(GL_ARRAY_BUFFER, o.vb);
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_NORMAL_ARRAY);
+    glDisableClientState(GL_COLOR_ARRAY);
+    glVertexPointer(3, GL_FLOAT, 36, (const void*)0);
+    glNormalPointer(GL_FLOAT, 36, (const void*)(sizeof(float)*3));
+
+    glDrawArrays(GL_TRIANGLES, 0, 3 * o.numTriangles);
+    CheckErrors("drawarrays");
+  }
+}
+
+static void Init() {
+  trackball(curr_quat, 0, 0, 0, 0);
+
+  eye[0] = 0.0f;
+  eye[1] = 0.0f;
+  eye[2] = 3.0f;
+
+  lookat[0] = 0.0f;
+  lookat[1] = 0.0f;
+  lookat[2] = 0.0f;
+
+  up[0] = 0.0f;
+  up[1] = 1.0f;
+  up[2] = 0.0f;
+}
+
+
+int main(int argc, char **argv)
+{
+  if (argc < 2) {
+    std::cout << "view input.obj <num_threads> <benchark_only> <verbose>" << std::endl;
+    return 0;
+  }
+
+  bool benchmark_only = false;
+  int num_threads = -1;
+  bool verbose = false;
+
+  if (argc > 2) {
+    num_threads = atoi(argv[2]);
+  }
+
+  if (argc > 3) {
+    benchmark_only = (atoi(argv[3]) > 0) ? true : false;
+  }
+
+  if (argc > 4) {
+    verbose = true;
+  }
+
+  if (benchmark_only) {
+
+    tinyobj_opt::attrib_t attrib;
+    std::vector<tinyobj_opt::shape_t> shapes;
+    std::vector<tinyobj_opt::material_t> materials;
+
+    size_t data_len = 0;
+    const char* data = get_file_data(&data_len, argv[1]);
+    if (data == nullptr) {
+      printf("failed to load file\n");
+      exit(-1);
+      return false;
+    }
+
+    if (data_len < 4) {
+      printf("Empty file\n");
+      exit(-1);
+      return false;
+    }
+    printf("filesize: %d\n", (int)data_len);
+    tinyobj_opt::LoadOption option;
+    option.req_num_threads = num_threads;
+    option.verbose = true;
+
+    bool ret = parseObj(&attrib, &shapes, &materials, data, data_len, option);
+
+    return ret;
+  }
+
+  Init();
+
+  std::cout << "Initialize GLFW..." << std::endl;
+
+  if(!glfwInit()){
+    std::cerr << "Failed to initialize GLFW." << std::endl;
+    return -1;
+  }
+
+  std::cout << "GLFW OK." << std::endl;
+
+
+  window = glfwCreateWindow(width, height, "Obj viewer", NULL, NULL);
+  if(window == NULL){
+    std::cerr << "Failed to open GLFW window. " << std::endl;
+    glfwTerminate();
+    return 1;
+  }
+
+  glfwMakeContextCurrent(window);
+  glfwSwapInterval(1);
+
+  // Callback
+  glfwSetWindowSizeCallback(window, reshapeFunc);
+  glfwSetKeyCallback(window, keyboardFunc);
+  glfwSetMouseButtonCallback(window, clickFunc);
+  glfwSetCursorPosCallback(window, motionFunc);
+
+  glewExperimental = true;
+  if (glewInit() != GLEW_OK) {
+    std::cerr << "Failed to initialize GLEW." << std::endl;
+    return -1;
+  }
+
+  reshapeFunc(window, width, height);
+
+  float bmin[3], bmax[3];
+  if (false == LoadObjAndConvert(bmin, bmax, argv[1], num_threads, verbose)) {
+    printf("failed to load & conv\n");
+    return -1;
+  }
+
+  float maxExtent = 0.5f * (bmax[0] - bmin[0]);
+  if (maxExtent < 0.5f * (bmax[1] - bmin[1])) {
+    maxExtent = 0.5f * (bmax[1] - bmin[1]);
+  }
+  if (maxExtent < 0.5f * (bmax[2] - bmin[2])) {
+    maxExtent = 0.5f * (bmax[2] - bmin[2]);
+  }
+
+  while(glfwWindowShouldClose(window) == GL_FALSE) {
+    glfwPollEvents();
+    glClearColor(0.1f, 0.2f, 0.3f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glEnable(GL_DEPTH_TEST);
+
+    // camera & rotate
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    GLfloat mat[4][4];
+    gluLookAt(eye[0], eye[1], eye[2], lookat[0], lookat[1], lookat[2], up[0], up[1], up[2]);
+    build_rotmatrix(mat, curr_quat);
+    glMultMatrixf(&mat[0][0]);
+
+    // Fit to -1, 1
+    glScalef(1.0f / maxExtent, 1.0f / maxExtent, 1.0f / maxExtent);
+
+    // Centerize object.
+    glTranslatef(-0.5*(bmax[0] + bmin[0]), -0.5*(bmax[1] + bmin[1]), -0.5*(bmax[2] + bmin[2]));
+  
+    Draw(gDrawObjects);
+
+    glfwSwapBuffers(window);
+  }
+
+  glfwTerminate();
+}

jni/Android.mk

@@ -5,8 +5,8 @@ LOCAL_PATH := $(call my-dir)
 
 include $(CLEAR_VARS)
 LOCAL_MODULE := tinyobjloader
-LOCAL_SRC_FILES := ../tiny_obj_loader.cc ../test.cc
+LOCAL_SRC_FILES := ../tiny_obj_loader.cc
 
 LOCAL_C_INCLUDES := ../
 
-include $(BUILD_EXECUTABLE)
+include $(BUILD_STATIC_LIBRARY)

loader_example.cc

@@ -0,0 +1,425 @@
+//
+// g++ loader_example.cc
+//
+#define TINYOBJLOADER_IMPLEMENTATION
+#include "tiny_obj_loader.h"
+
+#include <cassert>
+#include <cstdio>
+#include <cstdlib>
+#include <fstream>
+#include <iostream>
+#include <sstream>
+
+#ifdef _WIN32
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include <windows.h>
+#include <mmsystem.h>
+#ifdef __cplusplus
+}
+#endif
+#pragma comment(lib, "winmm.lib")
+#else
+#if defined(__unix__) || defined(__APPLE__)
+#include <sys/time.h>
+#else
+#include <ctime>
+#endif
+#endif
+
+#ifdef __clang__
+#if __has_warning("-Wzero-as-null-pointer-constant")
+#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
+#endif
+#endif
+
+class timerutil {
+ public:
+#ifdef _WIN32
+  typedef DWORD time_t;
+
+  timerutil() { ::timeBeginPeriod(1); }
+  ~timerutil() { ::timeEndPeriod(1); }
+
+  void start() { t_[0] = ::timeGetTime(); }
+  void end() { t_[1] = ::timeGetTime(); }
+
+  time_t sec() { return (time_t)((t_[1] - t_[0]) / 1000); }
+  time_t msec() { return (time_t)((t_[1] - t_[0])); }
+  time_t usec() { return (time_t)((t_[1] - t_[0]) * 1000); }
+  time_t current() { return ::timeGetTime(); }
+
+#else
+#if defined(__unix__) || defined(__APPLE__)
+  typedef unsigned long int time_t;
+
+  void start() { gettimeofday(tv + 0, &tz); }
+  void end() { gettimeofday(tv + 1, &tz); }
+
+  time_t sec() { return static_cast<time_t>(tv[1].tv_sec - tv[0].tv_sec); }
+  time_t msec() {
+    return this->sec() * 1000 +
+           static_cast<time_t>((tv[1].tv_usec - tv[0].tv_usec) / 1000);
+  }
+  time_t usec() {
+    return this->sec() * 1000000 +
+           static_cast<time_t>(tv[1].tv_usec - tv[0].tv_usec);
+  }
+  time_t current() {
+    struct timeval t;
+    gettimeofday(&t, NULL);
+    return static_cast<time_t>(t.tv_sec * 1000 + t.tv_usec);
+  }
+
+#else  // C timer
+  // using namespace std;
+  typedef clock_t time_t;
+
+  void start() { t_[0] = clock(); }
+  void end() { t_[1] = clock(); }
+
+  time_t sec() { return (time_t)((t_[1] - t_[0]) / CLOCKS_PER_SEC); }
+  time_t msec() { return (time_t)((t_[1] - t_[0]) * 1000 / CLOCKS_PER_SEC); }
+  time_t usec() { return (time_t)((t_[1] - t_[0]) * 1000000 / CLOCKS_PER_SEC); }
+  time_t current() { return (time_t)clock(); }
+
+#endif
+#endif
+
+ private:
+#ifdef _WIN32
+  DWORD t_[2];
+#else
+#if defined(__unix__) || defined(__APPLE__)
+  struct timeval tv[2];
+  struct timezone tz;
+#else
+  time_t t_[2];
+#endif
+#endif
+};
+
+static void PrintInfo(const tinyobj::attrib_t& attrib,
+                      const std::vector<tinyobj::shape_t>& shapes,
+                      const std::vector<tinyobj::material_t>& materials) {
+  std::cout << "# of vertices  : " << (attrib.vertices.size() / 3) << std::endl;
+  std::cout << "# of normals   : " << (attrib.normals.size() / 3) << std::endl;
+  std::cout << "# of texcoords : " << (attrib.texcoords.size() / 2)
+            << std::endl;
+
+  std::cout << "# of shapes    : " << shapes.size() << std::endl;
+  std::cout << "# of materials : " << materials.size() << std::endl;
+
+  for (size_t v = 0; v < attrib.vertices.size(); v++) {
+    printf("  v[%ld] = (%f, %f, %f)\n", static_cast<long>(v),
+           static_cast<const double>(attrib.vertices[v].x),
+           static_cast<const double>(attrib.vertices[v].y),
+           static_cast<const double>(attrib.vertices[v].z));
+  }
+
+  for (size_t v = 0; v < attrib.normals.size(); v++) {
+    printf("  n[%ld] = (%f, %f, %f)\n", static_cast<long>(v),
+           static_cast<const double>(attrib.normals[v].x),
+           static_cast<const double>(attrib.normals[v].y),
+           static_cast<const double>(attrib.normals[v].z));
+  }
+
+  for (size_t v = 0; v < attrib.texcoords.size(); v++) {
+    printf("  uv[%ld] = (%f, %f)\n", static_cast<long>(v),
+           static_cast<const double>(attrib.texcoords[v].x),
+           static_cast<const double>(attrib.texcoords[v].y));
+  }
+
+  // For each shape
+  for (size_t i = 0; i < shapes.size(); i++) {
+    printf("shape[%ld].name = %s\n", static_cast<long>(i),
+           shapes[i].name.c_str());
+    printf("Size of shape[%ld].indices: %lu\n", static_cast<long>(i),
+           static_cast<unsigned long>(shapes[i].mesh.indices.size()));
+
+    size_t index_offset = 0;
+
+    assert(shapes[i].mesh.num_face_vertices.size() ==
+           shapes[i].mesh.material_ids.size());
+
+    printf("shape[%ld].num_faces: %lu\n", static_cast<long>(i),
+           static_cast<unsigned long>(shapes[i].mesh.num_face_vertices.size()));
+
+    // For each face
+    for (size_t f = 0; f < shapes[i].mesh.num_face_vertices.size(); f++) {
+      size_t fnum = shapes[i].mesh.num_face_vertices[f];
+
+      printf("  face[%ld].fnum = %ld\n", static_cast<long>(f),
+             static_cast<unsigned long>(fnum));
+
+      // For each vertex in the face
+      for (size_t v = 0; v < fnum; v++) {
+        tinyobj::index_t idx = shapes[i].mesh.indices[index_offset + v];
+        printf("    face[%ld].v[%ld].idx = %d/%d/%d\n", static_cast<long>(f),
+               static_cast<long>(v), idx.vertex_index, idx.normal_index,
+               idx.texcoord_index);
+      }
+
+      printf("  face[%ld].material_id = %d\n", static_cast<long>(f),
+             shapes[i].mesh.material_ids[f]);
+
+      index_offset += fnum;
+    }
+
+    printf("shape[%ld].num_tags: %lu\n", static_cast<long>(i),
+           static_cast<unsigned long>(shapes[i].mesh.tags.size()));
+    for (size_t t = 0; t < shapes[i].mesh.tags.size(); t++) {
+      printf("  tag[%ld] = %s ", static_cast<long>(t),
+             shapes[i].mesh.tags[t].name.c_str());
+      printf(" ints: [");
+      for (size_t j = 0; j < shapes[i].mesh.tags[t].intValues.size(); ++j) {
+        printf("%ld", static_cast<long>(shapes[i].mesh.tags[t].intValues[j]));
+        if (j < (shapes[i].mesh.tags[t].intValues.size() - 1)) {
+          printf(", ");
+        }
+      }
+      printf("]");
+
+      printf(" floats: [");
+      for (size_t j = 0; j < shapes[i].mesh.tags[t].floatValues.size(); ++j) {
+        printf("%f", static_cast<const double>(
+                         shapes[i].mesh.tags[t].floatValues[j]));
+        if (j < (shapes[i].mesh.tags[t].floatValues.size() - 1)) {
+          printf(", ");
+        }
+      }
+      printf("]");
+
+      printf(" strings: [");
+      for (size_t j = 0; j < shapes[i].mesh.tags[t].stringValues.size(); ++j) {
+        printf("%s", shapes[i].mesh.tags[t].stringValues[j].c_str());
+        if (j < (shapes[i].mesh.tags[t].stringValues.size() - 1)) {
+          printf(", ");
+        }
+      }
+      printf("]");
+      printf("\n");
+    }
+  }
+
+  for (size_t i = 0; i < materials.size(); i++) {
+    printf("material[%ld].name = %s\n", static_cast<long>(i),
+           materials[i].name.c_str());
+    printf("  material.Ka = (%f, %f ,%f)\n",
+           static_cast<const double>(materials[i].ambient[0]),
+           static_cast<const double>(materials[i].ambient[1]),
+           static_cast<const double>(materials[i].ambient[2]));
+    printf("  material.Kd = (%f, %f ,%f)\n",
+           static_cast<const double>(materials[i].diffuse[0]),
+           static_cast<const double>(materials[i].diffuse[1]),
+           static_cast<const double>(materials[i].diffuse[2]));
+    printf("  material.Ks = (%f, %f ,%f)\n",
+           static_cast<const double>(materials[i].specular[0]),
+           static_cast<const double>(materials[i].specular[1]),
+           static_cast<const double>(materials[i].specular[2]));
+    printf("  material.Tr = (%f, %f ,%f)\n",
+           static_cast<const double>(materials[i].transmittance[0]),
+           static_cast<const double>(materials[i].transmittance[1]),
+           static_cast<const double>(materials[i].transmittance[2]));
+    printf("  material.Ke = (%f, %f ,%f)\n",
+           static_cast<const double>(materials[i].emission[0]),
+           static_cast<const double>(materials[i].emission[1]),
+           static_cast<const double>(materials[i].emission[2]));
+    printf("  material.Ns = %f\n",
+           static_cast<const double>(materials[i].shininess));
+    printf("  material.Ni = %f\n", static_cast<const double>(materials[i].ior));
+    printf("  material.dissolve = %f\n",
+           static_cast<const double>(materials[i].dissolve));
+    printf("  material.illum = %d\n", materials[i].illum);
+    printf("  material.map_Ka = %s\n", materials[i].ambient_texname.c_str());
+    printf("  material.map_Kd = %s\n", materials[i].diffuse_texname.c_str());
+    printf("  material.map_Ks = %s\n", materials[i].specular_texname.c_str());
+    printf("  material.map_Ns = %s\n",
+           materials[i].specular_highlight_texname.c_str());
+    printf("  material.map_bump = %s\n", materials[i].bump_texname.c_str());
+    printf("    bump_multiplier = %f\n", static_cast<const double>(materials[i].bump_texopt.bump_multiplier));
+    printf("  material.map_d = %s\n", materials[i].alpha_texname.c_str());
+    printf("  material.disp = %s\n", materials[i].displacement_texname.c_str());
+    printf("  <<PBR>>\n");
+    printf("  material.Pr     = %f\n", static_cast<const double>(materials[i].roughness));
+    printf("  material.Pm     = %f\n", static_cast<const double>(materials[i].metallic));
+    printf("  material.Ps     = %f\n", static_cast<const double>(materials[i].sheen));
+    printf("  material.Pc     = %f\n", static_cast<const double>(materials[i].clearcoat_thickness));
+    printf("  material.Pcr    = %f\n", static_cast<const double>(materials[i].clearcoat_thickness));
+    printf("  material.aniso  = %f\n", static_cast<const double>(materials[i].anisotropy));
+    printf("  material.anisor = %f\n", static_cast<const double>(materials[i].anisotropy_rotation));
+    printf("  material.map_Ke = %s\n", materials[i].emissive_texname.c_str());
+    printf("  material.map_Pr = %s\n", materials[i].roughness_texname.c_str());
+    printf("  material.map_Pm = %s\n", materials[i].metallic_texname.c_str());
+    printf("  material.map_Ps = %s\n", materials[i].sheen_texname.c_str());
+    printf("  material.norm   = %s\n", materials[i].normal_texname.c_str());
+    std::map<std::string, std::string>::const_iterator it(
+        materials[i].unknown_parameter.begin());
+    std::map<std::string, std::string>::const_iterator itEnd(
+        materials[i].unknown_parameter.end());
+
+    for (; it != itEnd; it++) {
+      printf("  material.%s = %s\n", it->first.c_str(), it->second.c_str());
+    }
+    printf("\n");
+  }
+}
+
+static bool TestLoadObj(const char* filename, const char* basepath = NULL,
+                        bool triangulate = true) {
+  std::cout << "Loading " << filename << std::endl;
+
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  timerutil t;
+  t.start();
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename,
+                              basepath, triangulate);
+  t.end();
+  printf("Parsing time: %lu [msecs]\n", t.msec());
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  if (!ret) {
+    printf("Failed to load/parse .obj.\n");
+    return false;
+  }
+
+  PrintInfo(attrib, shapes, materials);
+
+  return true;
+}
+
+static bool TestStreamLoadObj() {
+  std::cout << "Stream Loading " << std::endl;
+
+  std::stringstream objStream;
+  objStream << "mtllib cube.mtl\n"
+               "\n"
+               "v 0.000000 2.000000 2.000000\n"
+               "v 0.000000 0.000000 2.000000\n"
+               "v 2.000000 0.000000 2.000000\n"
+               "v 2.000000 2.000000 2.000000\n"
+               "v 0.000000 2.000000 0.000000\n"
+               "v 0.000000 0.000000 0.000000\n"
+               "v 2.000000 0.000000 0.000000\n"
+               "v 2.000000 2.000000 0.000000\n"
+               "# 8 vertices\n"
+               "\n"
+               "g front cube\n"
+               "usemtl white\n"
+               "f 1 2 3 4\n"
+               "g back cube\n"
+               "# expects white material\n"
+               "f 8 7 6 5\n"
+               "g right cube\n"
+               "usemtl red\n"
+               "f 4 3 7 8\n"
+               "g top cube\n"
+               "usemtl white\n"
+               "f 5 1 4 8\n"
+               "g left cube\n"
+               "usemtl green\n"
+               "f 5 6 2 1\n"
+               "g bottom cube\n"
+               "usemtl white\n"
+               "f 2 6 7 3\n"
+               "# 6 elements";
+
+  std::string matStream(
+      "newmtl white\n"
+      "Ka 0 0 0\n"
+      "Kd 1 1 1\n"
+      "Ks 0 0 0\n"
+      "\n"
+      "newmtl red\n"
+      "Ka 0 0 0\n"
+      "Kd 1 0 0\n"
+      "Ks 0 0 0\n"
+      "\n"
+      "newmtl green\n"
+      "Ka 0 0 0\n"
+      "Kd 0 1 0\n"
+      "Ks 0 0 0\n"
+      "\n"
+      "newmtl blue\n"
+      "Ka 0 0 0\n"
+      "Kd 0 0 1\n"
+      "Ks 0 0 0\n"
+      "\n"
+      "newmtl light\n"
+      "Ka 20 20 20\n"
+      "Kd 1 1 1\n"
+      "Ks 0 0 0");
+
+  using namespace tinyobj;
+  class MaterialStringStreamReader : public MaterialReader {
+   public:
+    MaterialStringStreamReader(const std::string& matSStream)
+        : m_matSStream(matSStream) {}
+    virtual ~MaterialStringStreamReader() {}
+    virtual bool operator()(const std::string& matId,
+                            std::vector<material_t>* materials,
+                            std::map<unsigned int, int>* matMap,
+                            std::string* err) {
+      (void)matId;
+      std::string warning;
+      LoadMtl(matMap, materials, &m_matSStream, &warning);
+
+      if (!warning.empty()) {
+        if (err) {
+          (*err) += warning;
+        }
+      }
+      return true;
+    }
+
+   private:
+    std::stringstream m_matSStream;
+  };
+
+  MaterialStringStreamReader matSSReader(matStream);
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, &objStream,
+                              &matSSReader);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  if (!ret) {
+    return false;
+  }
+
+  PrintInfo(attrib, shapes, materials);
+
+  return true;
+}
+
+int main(int argc, char** argv) {
+  if (argc > 1) {
+    const char* basepath = "models/";
+    if (argc > 2) {
+      basepath = argv[2];
+    }
+    assert(true == TestLoadObj(argv[1], basepath));
+  } else {
+    // assert(true == TestLoadObj("cornell_box.obj"));
+    // assert(true == TestLoadObj("cube.obj"));
+    assert(true == TestStreamLoadObj());
+    assert(true ==
+           TestLoadObj("models/catmark_torus_creases0.obj", "models/", false));
+  }
+
+  return 0;
+}

models/cube-vertexcol.obj

@@ -0,0 +1,31 @@
+mtllib cube.mtl
+
+v 0.000000 2.000000 2.000000 0 0 0
+v 0.000000 0.000000 2.000000 0 0 1
+v 2.000000 0.000000 2.000000 0 1 0
+v 2.000000 2.000000 2.000000 0 1 1
+v 0.000000 2.000000 0.000000 1 0 0
+v 0.000000 0.000000 0.000000 1 0 1
+v 2.000000 0.000000 0.000000 1 1 0
+v 2.000000 2.000000 0.000000 1 1 1
+# 8 vertices
+
+g front cube
+usemtl white
+f 1 2 3 4
+g back cube
+# expects white material
+f 8 7 6 5
+g right cube
+usemtl red
+f 4 3 7 8
+g top cube
+usemtl white
+f 5 1 4 8
+g left cube
+usemtl green
+f 5 6 2 1
+g bottom cube
+usemtl white
+f 2 6 7 3
+# 6 elements

models/issue-138.mtl

@@ -0,0 +1,23 @@
+newmtl test1
+  Ns 10.0000
+  Ni 1.5000
+  d 1.0000
+  Tr 0.0000
+  Tf 1.0000 1.0000 1.0000 
+  illum 2
+  Ka 0.0000 0.0000 0.0000
+  Kd 0.5 0.2 0.2
+  Ks 0.0000 0.0000 0.0000
+  Ke 0.0000 0.0000 0.0000
+
+ newmtl test2
+  Ns 10.0000
+  Ni 1.5000
+  d 1.0000
+  Tr 0.0000
+  Tf 1.0000 1.0000 1.0000 
+  illum 2
+  Ka 0.0000 0.0000 0.0000
+  Kd 0.2 0.5 0.2
+  Ks 0.0000 0.0000 0.0000
+  Ke 0.0000 0.0000 0.0000

models/issue-138.obj

@@ -0,0 +1,51 @@
+
+# cube.obj
+#
+
+mtllib issue-138.mtl
+
+v -0.500000 -0.500000 0.500000
+v 0.500000 -0.500000 0.500000
+v -0.500000 0.500000 0.500000
+v 0.500000 0.500000 0.500000
+v -0.500000 0.500000 -0.500000
+v 0.500000 0.500000 -0.500000
+v -0.500000 -0.500000 -0.500000
+v 0.500000 -0.500000 -0.500000
+
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vt 0.000000 1.000000
+vt 1.000000 1.000000
+
+vn 0.000000 0.000000 1.000000
+vn 0.000000 1.000000 0.000000
+vn 0.000000 0.000000 -1.000000
+vn 0.000000 -1.000000 0.000000
+vn 1.000000 0.000000 0.000000
+vn -1.000000 0.000000 0.000000
+
+usemtl test1
+g test1
+s 1
+f 1/1/1 2/2/1 3/3/1
+f 3/3/1 2/2/1 4/4/1
+
+usemtl test2
+g test2
+
+s 2
+f 3/1/2 4/2/2 5/3/2
+f 5/3/2 4/2/2 6/4/2
+s 3
+f 5/4/3 6/3/3 7/2/3
+f 7/2/3 6/3/3 8/1/3
+s 4
+f 7/1/4 8/2/4 1/3/4
+f 1/3/4 8/2/4 2/4/4
+s 5
+f 2/1/5 8/2/5 4/3/5
+f 4/3/5 8/2/5 6/4/5
+s 6
+f 7/1/6 1/2/6 5/3/6
+f 5/3/6 1/2/6 3/4/6

models/issue-140-zero-face-idx.mtl

@@ -0,0 +1,2 @@
+newmtl main
+Kd 1 1 1

models/issue-140-zero-face-idx.obj

@@ -0,0 +1,17 @@
+mtllib issue-140-zero-face-idx.mtl
+
+v -0.5 -0.5 0
+v 0.5 -0.5 0
+v 0.5 0.5 0
+v -0.5 0.5 0
+
+vt 0 0 0
+vt 1 0 0
+vt 1 1 0
+vt 0 1 0
+
+vn 0 0 -1
+
+usemtl main
+f 0/0/0 1/1/0 3/3/0
+f 1/1/0 3/3/0 2/2/0

models/issue-92.mtl

@@ -0,0 +1,6 @@
+newmtl default
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+map_Kd tmp.png 
+

models/issue-92.obj

@@ -0,0 +1,7 @@
+mtllib issue-92.mtl
+o Test
+v 1.864151 -1.219172 -5.532511
+v 0.575869 -0.666304 5.896140
+v 0.940448 1.000000 -1.971128
+usemtl default
+f 1 2 3

models/issue-95-2.mtl

@@ -0,0 +1,5 @@
+newmtl default
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+Tf 0.1 0.2 0.3

models/issue-95-2.obj

@@ -0,0 +1,7 @@
+mtllib issue-95-2.mtl
+o Test
+v 1.864151 -1.219172 -5.532511
+v 0.575869 -0.666304 5.896140
+v 0.940448 1.000000 -1.971128
+usemtl default
+f 1 2 3

models/issue-95.mtl

@@ -0,0 +1,5 @@
+newmtl default
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+Kt 0.1 0.2 0.3

models/issue-95.obj

@@ -0,0 +1,7 @@
+mtllib issue-95.mtl
+o Test
+v 1.864151 -1.219172 -5.532511
+v 0.575869 -0.666304 5.896140
+v 0.940448 1.000000 -1.971128
+usemtl default
+f 1 2 3

models/map-bump.mtl

@@ -0,0 +1,10 @@
+newmtl Material.001
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+map_Bump bump.jpg
+
+newmtl Material.003
+Ka 0 0 0
+Kd 1 1 1
+Ks 0 0 0

models/map-bump.obj

@@ -0,0 +1,817 @@
+# https://github.com/syoyo/tinyobjloader/issues/68
+# Blender v2.73 (sub 0) OBJ File: 'enemy.blend'
+# www.blender.org
+mtllib map-bump.mtl
+o Cube
+v 1.864151 -1.219172 -5.532511
+v 0.575869 -0.666304 5.896140
+v 0.940448 1.000000 -1.971128
+v 1.620345 1.000000 -5.815706
+v 1.864152 1.000000 -6.334323
+v 0.575869 -0.129842 5.896143
+v 5.440438 -1.462153 -5.818601
+v 4.896782 -1.462153 -2.744413
+v 1.000825 -0.677484 1.899605
+v 5.440438 -1.246362 -5.818600
+v 1.000825 0.852342 1.899608
+v 4.896782 -1.246362 -2.744412
+v 1.160660 -0.450871 -2.356325
+v 1.704316 -0.450871 -5.430513
+v 1.000825 -0.351920 -1.293797
+v 1.000825 1.000000 -1.293794
+v 1.160660 -0.877888 -2.356326
+v 1.704316 -0.877888 -5.430514
+v 1.000825 -1.219172 -1.452514
+v 1.000825 1.000000 -1.452511
+v 1.000825 -0.351920 1.759410
+v 1.000825 1.000000 1.759413
+v 9.097919 1.221145 -6.212147
+v 8.356775 1.221145 -2.021231
+v 1.864151 -0.109586 -6.334325
+v 0.575869 -0.398073 5.896141
+v 9.097919 0.943958 -6.212148
+v 8.356775 0.943958 -2.021233
+v 1.061916 0.113661 -1.797961
+v 1.000825 0.161258 1.899606
+v 1.000825 0.324040 -1.293795
+v 1.803060 0.113661 -5.988876
+v 1.000825 -0.109586 -1.452513
+v 1.061916 0.776753 -1.797960
+v 1.803061 0.776753 -5.988875
+v 1.000825 0.324040 1.759412
+v 0.000825 -1.219172 -5.532512
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+v 0.000826 1.000000 -6.334325
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+f 118/60/44 210/75/44 171/76/44
+f 218/78/44 217/77/44 176/72/44
+f 172/46/56 176/72/56 170/73/56
+f 173/74/57 171/76/57 177/80/57
+f 215/109/78 217/77/78 171/76/78
+f 181/50/33 185/83/33 180/49/33
+f 158/84/15 134/25/15 181/50/15
+f 148/12/15 180/49/15 114/5/15
+f 114/5/15 178/85/15 134/25/15
+f 185/83/15 189/90/15 184/82/15
+f 179/86/17 183/88/17 181/50/17
+f 178/85/2 180/49/2 182/89/2
+f 178/85/32 182/89/32 179/86/32
+f 188/87/24 189/90/24 192/91/24
+f 183/88/15 187/92/15 185/83/15
+f 182/89/15 184/82/15 186/93/15
+f 182/89/15 186/93/15 183/88/15
+f 190/96/15 192/91/15 191/94/15
+f 187/92/2 191/94/2 189/90/2
+f 188/87/17 192/91/17 186/93/17
+f 187/92/3 186/93/3 191/94/3
+f 141/26/54 197/98/54 144/43/54
+f 143/44/53 144/43/53 195/99/53
+f 138/27/52 143/44/52 194/100/52
+f 138/27/51 194/100/51 141/26/51
+f 200/37/59 208/102/59 201/31/59
+f 200/37/60 199/35/60 208/102/60
+f 199/35/61 198/36/61 207/103/61
+f 201/31/79 209/101/79 198/36/79
+f 205/108/54 209/101/54 204/105/54
+f 203/106/53 204/105/53 207/103/53
+f 202/107/52 203/106/52 206/104/52
+f 202/107/51 206/104/51 205/108/51
+f 194/100/63 202/107/63 197/98/63
+f 194/100/64 195/99/64 202/107/64
+f 195/99/65 196/97/65 203/106/65
+f 197/98/66 205/108/66 196/97/66
+f 170/73/80 174/79/80 215/109/80
+f 177/80/44 175/81/44 218/78/44
+f 111/65/44 170/73/44 210/75/44
+f 216/71/81 173/74/81 218/78/81
+f 118/60/23 151/61/23 210/75/23
+f 139/42/44 173/74/44 212/1/44
+f 120/11/44 139/42/44 211/2/44
+usemtl Material.003
+f 41/62/82 104/64/82 102/2/82
+f 211/2/82 213/64/82 150/62/82
+f 11/11/82 41/62/82 102/2/82
+f 120/11/82 211/2/82 150/62/82

models/mtllib-multiple-files-issue-112.mtl

@@ -0,0 +1,6 @@
+newmtl default
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+map_Kd tmp.png 
+

models/mtllib-multiple-files-issue-112.obj

@@ -0,0 +1,7 @@
+mtllib invalid-file-aaa.mtl invalid-file-bbb.mtl mtllib-multiple-files-issue-112.mtl
+o Test
+v 1.864151 -1.219172 -5.532511
+v 0.575869 -0.666304 5.896140
+v 0.940448 1.000000 -1.971128
+usemtl default
+f 1 2 3

models/norm-texopt.mtl

@@ -0,0 +1,7 @@
+newmtl default
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+Kt 0.1 0.2 0.3
+norm -bm 3 normalmap.jpg
+

models/norm-texopt.obj

@@ -0,0 +1,7 @@
+mtllib norm-texopt.mtl
+o Test
+v 1.864151 -1.219172 -5.532511
+v 0.575869 -0.666304 5.896140
+v 0.940448 1.000000 -1.971128
+usemtl default
+f 1 2 3

models/pbr-mat-ext.mtl

@@ -0,0 +1,19 @@
+# .MTL with PBR extension.
+newmtl pbr
+Ka 0 0 0
+Kd 1 1 1
+Ks 0 0 0
+Ke 0.1 0.1 0.1
+Pr 0.2
+Pm 0.3
+Ps 0.4
+Pc 0.5
+Pcr 0.6
+aniso 0.7
+anisor 0.8
+map_Pr roughness.tex
+map_Pm metallic.tex
+map_Ps sheen.tex
+map_Ke emissive.tex
+norm normalmap.tex
+

models/pbr-mat-ext.obj

@@ -0,0 +1,10 @@
+mtllib pbr-mat-ext.mtl
+
+o floor
+usemtl pbr
+v 552.8 0.0   0.0
+v 0.0   0.0   0.0
+v 0.0   0.0 559.2
+v 549.6 0.0 559.2
+
+f 1 2 3 4 

models/refl.mtl

@@ -0,0 +1,25 @@
+newmtl white
+Ka 0 0 0
+Kd 1 1 1
+Ks 0 0 0
+refl reflection.tga
+
+newmtl red
+Ka 0 0 0
+Kd 1 0 0
+Ks 0 0 0
+
+newmtl green
+Ka 0 0 0
+Kd 0 1 0
+Ks 0 0 0
+
+newmtl blue
+Ka 0 0 0
+Kd 0 0 1
+Ks 0 0 0
+
+newmtl light
+Ka 20 20 20
+Kd 1 1 1
+Ks 0 0 0

models/refl.obj

@@ -0,0 +1,32 @@
+# Test for `refl` material parameter
+mtllib refl.mtl
+
+v 0.000000 2.000000 2.000000
+v 0.000000 0.000000 2.000000
+v 2.000000 0.000000 2.000000
+v 2.000000 2.000000 2.000000
+v 0.000000 2.000000 0.000000
+v 0.000000 0.000000 0.000000
+v 2.000000 0.000000 0.000000
+v 2.000000 2.000000 0.000000
+# 8 vertices
+
+g front cube
+usemtl white
+f 1 2 3 4
+g back cube
+# expects white material
+f 8 7 6 5
+g right cube
+usemtl red
+f 4 3 7 8
+g top cube
+usemtl white
+f 5 1 4 8
+g left cube
+usemtl green
+f 5 6 2 1
+g bottom cube
+usemtl white
+f 2 6 7 3
+# 6 elements

models/texture-filename-with-whitespace.mtl

@@ -0,0 +1,28 @@
+newmtl white
+Ka 0 0 0
+Kd 1 1 1
+Ks 0 0 0
+# filename with white space.
+map_Kd texture 01.png
+
+newmtl red
+Ka 0 0 0
+Kd 1 0 0
+Ks 0 0 0
+# texture option + filename with white space.
+bump -bm 2 bump 01.png
+
+newmtl green
+Ka 0 0 0
+Kd 0 1 0
+Ks 0 0 0
+
+newmtl blue
+Ka 0 0 0
+Kd 0 0 1
+Ks 0 0 0
+
+newmtl light
+Ka 20 20 20
+Kd 1 1 1
+Ks 0 0 0

models/texture-filename-with-whitespace.obj

@@ -0,0 +1,31 @@
+mtllib texture-filename-with-whitespace.mtl
+
+v 0.000000 2.000000 2.000000
+v 0.000000 0.000000 2.000000
+v 2.000000 0.000000 2.000000
+v 2.000000 2.000000 2.000000
+v 0.000000 2.000000 0.000000
+v 0.000000 0.000000 0.000000
+v 2.000000 0.000000 0.000000
+v 2.000000 2.000000 0.000000
+# 8 vertices
+
+g front cube
+usemtl white
+f 1 2 3 4
+g back cube
+# expects white material
+f 8 7 6 5
+g right cube
+usemtl red
+f 4 3 7 8
+g top cube
+usemtl white
+f 5 1 4 8
+g left cube
+usemtl green
+f 5 6 2 1
+g bottom cube
+usemtl white
+f 2 6 7 3
+# 6 elements

models/texture-options-issue-85.mtl

@@ -0,0 +1,36 @@
+newmtl default
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+Kt 0.1 0.2 0.3
+map_Ka -clamp on ambient.jpg
+map_Kd -o 0.1 diffuse.jpg
+map_Ks -s 0.1 0.2 specular.jpg
+map_Ns -t 0.1 0.2 0.3 specular_highlight.jpg
+map_bump -bm 3 bumpmap.jpg
+
+newmtl bm2
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+Kt 0.1 0.2 0.3
+# blendu
+map_Kd -blendu on diffuse.jpg
+map_Ks -blendv off specular.jpg
+map_Ns -mm 0.1 0.3 specular_highlight.jpg
+# -bm after filename
+map_bump -imfchan r bumpmap2.jpg -bm 1.5
+
+newmtl bm3
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+Kt 0.1 0.2 0.3
+# type
+map_Kd -type sphere diffuse.jpg
+map_Ks -type cube_top specular.jpg
+map_Ns -type cube_bottom specular_highlight.jpg
+map_Ka -type cube_left ambient.jpg
+map_d -type cube_right alpha.jpg
+map_bump -type cube_front bump.jpg
+disp -type cube_back displacement.jpg

models/texture-options-issue-85.obj

@@ -0,0 +1,7 @@
+mtllib texture-options-issue-85.mtl
+o Test
+v 1.864151 -1.219172 -5.532511
+v 0.575869 -0.666304 5.896140
+v 0.940448 1.000000 -1.971128
+usemtl default
+f 1 2 3

models/tr-and-d-issue-43.mtl

@@ -0,0 +1,13 @@
+newmtl Material.001
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+d 0.75
+Tr 0.5
+
+newmtl Material.002
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+Tr 0.5
+d 0.75

models/tr-and-d-issue-43.obj

@@ -0,0 +1,817 @@
+# https://github.com/syoyo/tinyobjloader/issues/68
+# Blender v2.73 (sub 0) OBJ File: 'enemy.blend'
+# www.blender.org
+mtllib tr-and-d-issue-43.mtl
+o Cube
+v 1.864151 -1.219172 -5.532511
+v 0.575869 -0.666304 5.896140
+v 0.940448 1.000000 -1.971128
+v 1.620345 1.000000 -5.815706
+v 1.864152 1.000000 -6.334323
+v 0.575869 -0.129842 5.896143
+v 5.440438 -1.462153 -5.818601
+v 4.896782 -1.462153 -2.744413
+v 1.000825 -0.677484 1.899605
+v 5.440438 -1.246362 -5.818600
+v 1.000825 0.852342 1.899608
+v 4.896782 -1.246362 -2.744412
+v 1.160660 -0.450871 -2.356325
+v 1.704316 -0.450871 -5.430513
+v 1.000825 -0.351920 -1.293797
+v 1.000825 1.000000 -1.293794
+v 1.160660 -0.877888 -2.356326
+v 1.704316 -0.877888 -5.430514
+v 1.000825 -1.219172 -1.452514
+v 1.000825 1.000000 -1.452511
+v 1.000825 -0.351920 1.759410
+v 1.000825 1.000000 1.759413
+v 9.097919 1.221145 -6.212147
+v 8.356775 1.221145 -2.021231
+v 1.864151 -0.109586 -6.334325
+v 0.575869 -0.398073 5.896141
+v 9.097919 0.943958 -6.212148
+v 8.356775 0.943958 -2.021233
+v 1.061916 0.113661 -1.797961
+v 1.000825 0.161258 1.899606
+v 1.000825 0.324040 -1.293795
+v 1.803060 0.113661 -5.988876
+v 1.000825 -0.109586 -1.452513
+v 1.061916 0.776753 -1.797960
+v 1.803061 0.776753 -5.988875
+v 1.000825 0.324040 1.759412
+v 0.000825 -1.219172 -5.532512
+v 0.000825 -0.666304 5.896139
+v 0.000826 1.000000 -6.334325
+v 0.000825 -0.129842 5.896140
+v 0.000825 0.852342 1.899606
+v 0.000825 -0.677484 1.899604
+v 0.000825 -0.351920 -1.293797
+v 0.000825 1.000000 -1.293796
+v 0.000825 1.000000 -1.452513
+v 0.000825 -1.219172 -1.452515
+v 0.000825 -0.351920 1.759409
+v 0.000825 1.000000 1.759411
+v 0.000826 -0.109586 -6.334326
+v 0.000825 -0.398073 5.896140
+v 0.152918 1.000000 -5.815708
+v 0.152917 1.000000 -1.971130
+v 0.940448 1.168419 -1.971128
+v 1.620345 1.168419 -5.815706
+v 0.152918 1.168419 -5.815708
+v 0.152917 1.168419 -1.971130
+v 0.921118 1.091883 -1.050430
+v 0.921118 1.091883 1.516050
+v 0.080533 1.091883 -1.050432
+v 0.080533 1.091883 1.516048
+v 0.613003 -0.553430 5.546911
+v 0.963691 -0.559956 2.248834
+v 0.613003 -0.396857 5.546912
+v 0.963691 -0.070362 2.248835
+v 1.499370 -0.994317 3.966028
+v 1.850058 -0.997914 0.667950
+v 1.499370 -0.908021 3.966029
+v 1.850058 -0.728071 0.667951
+v 1.601022 0.760960 -6.334324
+v 1.601021 0.129454 -6.334325
+v 0.263955 0.760960 -6.334325
+v 0.263955 0.129454 -6.334325
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+v 0.530168 0.760960 -7.515330
+v 0.530168 0.129455 -7.515330
+v 1.192720 0.649445 -7.515329
+v 1.192720 0.240971 -7.515330
+v 0.672258 0.649445 -7.515330
+v 0.672258 0.240971 -7.515330
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+v 1.192719 0.240970 -6.524631
+v 0.672257 0.649444 -6.524631
+v 0.672257 0.240970 -6.524631
+v 3.851026 0.431116 -1.883326
+v 3.851026 0.946662 -1.883325
+v 4.592170 0.946662 -6.074241
+v 4.592169 0.431116 -6.074242
+v 4.995714 0.561404 -1.918362
+v 4.995714 1.016394 -1.918360
+v 5.736857 1.016394 -6.109276
+v 5.736857 0.561404 -6.109277
+v 3.975454 0.471731 -2.162156
+v 3.975454 0.919244 -2.162155
+v 4.618796 0.919244 -5.800034
+v 4.618795 0.471730 -5.800035
+v 4.969088 0.584825 -2.192568
+v 4.969088 0.979775 -2.192567
+v 5.612430 0.979775 -5.830446
+v 5.612429 0.584825 -5.830447
+v 0.864214 -0.673890 3.184381
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+v 0.864213 -0.018552 3.184383
+v 0.000825 0.489129 3.184382
+v 0.000825 -0.673890 3.184381
+v 0.850955 -0.557858 3.309075
+v 0.850955 -0.175321 3.309076
+v 1.737321 -0.996758 1.728192
+v 1.737321 -0.785920 1.728193
+v -1.864151 -1.219172 -5.532511
+v -0.575869 -0.666304 5.896140
+v -0.940448 1.000000 -1.971128
+v -1.620345 1.000000 -5.815706
+v -1.864152 1.000000 -6.334323
+v -0.575869 -0.129842 5.896143
+v -5.440438 -1.462153 -5.818601
+v -4.896782 -1.462153 -2.744413
+v -1.000825 -0.677484 1.899605
+v -5.440438 -1.246362 -5.818600
+v -1.000825 0.852342 1.899608
+v -4.896782 -1.246362 -2.744412
+v -1.160660 -0.450871 -2.356325
+v -1.704316 -0.450871 -5.430513
+v -1.000825 -0.351920 -1.293797
+v -1.000825 1.000000 -1.293794
+v -1.160660 -0.877888 -2.356326
+v -1.704316 -0.877888 -5.430514
+v -1.000825 -1.219172 -1.452514
+v -1.000825 1.000000 -1.452511
+v -1.000825 -0.351920 1.759410
+v -1.000825 1.000000 1.759413
+v -9.097919 1.221145 -6.212147
+v -8.356775 1.221145 -2.021231
+v -1.864151 -0.109586 -6.334325
+v -0.575869 -0.398073 5.896141
+v -9.097919 0.943958 -6.212148
+v -8.356775 0.943958 -2.021233
+v -1.061916 0.113661 -1.797961
+v -1.000825 0.161258 1.899606
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+v -1.803060 0.113661 -5.988876
+v -1.000825 -0.109586 -1.452513
+v -1.061916 0.776753 -1.797960
+v -1.803061 0.776753 -5.988875
+v -1.000825 0.324040 1.759412
+v -0.000825 -1.219172 -5.532512
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+v -0.000826 1.000000 -6.334325
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+v -0.000825 -0.351920 -1.293797
+v -0.000825 1.000000 -1.293796
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+v -0.921118 1.091883 1.516050
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+v -4.995714 1.016394 -1.918360
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+v -3.975454 0.471731 -2.162156
+v -3.975454 0.919244 -2.162155
+v -4.618796 0.919244 -5.800034
+v -4.618795 0.471730 -5.800035
+v -4.969088 0.584825 -2.192568
+v -4.969088 0.979775 -2.192567
+v -5.612430 0.979775 -5.830446
+v -5.612429 0.584825 -5.830447
+v -0.864214 -0.673890 3.184381
+v -0.864213 0.489129 3.184384
+v -0.864213 -0.018552 3.184383
+v -0.000825 0.489129 3.184382
+v -0.000825 -0.673890 3.184381
+v -0.850955 -0.557858 3.309075
+v -0.850955 -0.175321 3.309076
+v -1.737321 -0.996758 1.728192
+v -1.737321 -0.785920 1.728193
+vt 0.135351 -0.558072
+vt 0.003035 -0.363507
+vt 0.092282 -0.976844
+vt -0.081322 0.947351
+vt 0.100058 1.958891
+vt 0.050091 1.852185
+vt -0.092752 1.055565
+vt -0.251711 1.059474
+vt 0.075587 0.041384
+vt -0.086008 0.279003
+vt -0.086212 0.249830
+vt -0.276044 1.968137
+vt -0.246101 1.859467
+vt 0.009828 1.911388
+vt -0.133014 1.114769
+vt 0.413322 1.261595
+vt 0.299103 0.624605
+vt 1.243955 0.407183
+vt 0.515404 1.111487
+vt 1.358173 1.044173
+vt -0.081553 0.914324
+vt 0.080042 0.676706
+vt 0.401185 0.474498
+vt 1.295541 0.331328
+vt 0.365315 1.568841
+vt 0.299111 1.575740
+vt 0.143401 0.707357
+vt 0.629403 1.011947
+vt 0.449192 0.167251
+vt 1.409760 0.968317
+vt 0.986264 1.738667
+vt 1.573373 1.877873
+vt 1.417663 1.009490
+vt 0.237182 -0.196235
+vt 0.721785 1.030226
+vt 0.830554 0.870285
+vt 0.877494 1.898608
+vt 1.351399 1.106930
+vt 0.183935 0.557301
+vt 1.507109 1.975312
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+f 114/5/2 113/6/2 148/12/2
+f 112/7/45 162/15/45 113/6/45
+f 122/17/46 123/16/46 121/18/46
+f 123/16/47 127/19/47 119/20/47
+f 142/39/24 140/22/24 129/4/24
+f 122/17/48 121/18/48 126/23/48
+f 142/39/45 138/27/45 134/25/45
+f 116/30/45 117/24/45 119/20/45
+f 128/29/75 126/23/75 110/28/75
+f 142/39/45 122/17/45 128/29/45
+f 110/28/76 127/19/76 134/25/76
+f 126/23/50 117/24/50 127/19/50
+f 198/36/51 137/33/51 201/31/51
+f 140/22/24 145/9/24 125/21/24
+f 124/41/24 130/34/24 140/22/24
+f 198/36/52 199/35/52 137/33/52
+f 199/35/53 200/37/53 133/38/53
+f 134/25/45 123/16/45 142/39/45
+f 136/32/45 137/33/45 132/40/45
+f 128/29/24 124/41/24 142/39/24
+f 145/9/24 130/34/24 139/42/24
+f 134/25/45 141/26/45 114/5/45
+f 129/4/45 114/5/45 143/44/45
+f 129/4/45 143/44/45 142/39/45
+f 201/31/54 136/32/54 200/37/54
+f 135/45/44 212/1/44 172/46/44
+f 111/65/14 147/48/14 135/45/14
+f 158/84/15 181/50/15 148/12/15
+f 153/58/26 168/53/26 157/51/26
+f 130/34/17 124/41/17 156/54/17
+f 110/28/17 146/56/17 128/29/17
+f 154/57/2 148/12/2 161/8/2
+f 154/57/2 129/4/2 153/58/2
+f 128/29/18 155/55/18 124/41/18
+f 118/60/19 130/34/19 151/61/19
+f 157/51/20 131/10/20 150/62/20
+f 110/28/21 134/25/21 146/56/21
+f 135/45/14 159/47/14 115/3/14
+f 211/2/22 115/3/22 213/64/22
+f 210/75/23 214/66/23 111/65/23
+f 163/14/2 162/15/2 164/67/2
+f 161/8/14 165/68/14 112/7/14
+f 113/6/15 163/14/15 160/13/15
+f 160/13/3 164/67/3 161/8/3
+f 168/53/2 166/69/2 169/52/2
+f 131/10/25 157/51/25 167/70/25
+f 131/10/16 167/70/16 125/21/16
+f 153/58/27 125/21/27 168/53/27
+f 172/46/77 216/71/77 176/72/77
+f 111/65/44 135/45/44 170/73/44
+f 139/42/44 118/60/44 173/74/44
+f 118/60/44 210/75/44 171/76/44
+f 218/78/44 217/77/44 176/72/44
+f 172/46/56 176/72/56 170/73/56
+f 173/74/57 171/76/57 177/80/57
+f 215/109/78 217/77/78 171/76/78
+f 181/50/33 185/83/33 180/49/33
+f 158/84/15 134/25/15 181/50/15
+f 148/12/15 180/49/15 114/5/15
+f 114/5/15 178/85/15 134/25/15
+f 185/83/15 189/90/15 184/82/15
+f 179/86/17 183/88/17 181/50/17
+f 178/85/2 180/49/2 182/89/2
+f 178/85/32 182/89/32 179/86/32
+f 188/87/24 189/90/24 192/91/24
+f 183/88/15 187/92/15 185/83/15
+f 182/89/15 184/82/15 186/93/15
+f 182/89/15 186/93/15 183/88/15
+f 190/96/15 192/91/15 191/94/15
+f 187/92/2 191/94/2 189/90/2
+f 188/87/17 192/91/17 186/93/17
+f 187/92/3 186/93/3 191/94/3
+f 141/26/54 197/98/54 144/43/54
+f 143/44/53 144/43/53 195/99/53
+f 138/27/52 143/44/52 194/100/52
+f 138/27/51 194/100/51 141/26/51
+f 200/37/59 208/102/59 201/31/59
+f 200/37/60 199/35/60 208/102/60
+f 199/35/61 198/36/61 207/103/61
+f 201/31/79 209/101/79 198/36/79
+f 205/108/54 209/101/54 204/105/54
+f 203/106/53 204/105/53 207/103/53
+f 202/107/52 203/106/52 206/104/52
+f 202/107/51 206/104/51 205/108/51
+f 194/100/63 202/107/63 197/98/63
+f 194/100/64 195/99/64 202/107/64
+f 195/99/65 196/97/65 203/106/65
+f 197/98/66 205/108/66 196/97/66
+f 170/73/80 174/79/80 215/109/80
+f 177/80/44 175/81/44 218/78/44
+f 111/65/44 170/73/44 210/75/44
+f 216/71/81 173/74/81 218/78/81
+f 118/60/23 151/61/23 210/75/23
+f 139/42/44 173/74/44 212/1/44
+f 120/11/44 139/42/44 211/2/44
+usemtl Material.002
+f 41/62/82 104/64/82 102/2/82
+f 211/2/82 213/64/82 150/62/82
+f 11/11/82 41/62/82 102/2/82
+f 120/11/82 211/2/82 150/62/82

models/usemtl-issue-104.obj

@@ -0,0 +1,30 @@
+# cornell_box.obj and cornell_box.mtl are grabbed from Intel's embree project.
+# original cornell box data
+  # comment
+
+# empty line including some space
+   
+
+mtllib cornell_box.mtl
+
+o floor
+v 552.8 0.0   0.0
+v 0.0   0.0   0.0
+v 0.0   0.0 559.2
+v 549.6 0.0 559.2
+
+v 130.0 0.0  65.0
+v  82.0 0.0 225.0
+v 240.0 0.0 272.0
+v 290.0 0.0 114.0
+
+v 423.0 0.0 247.0
+v 265.0 0.0 296.0
+v 314.0 0.0 456.0
+v 472.0 0.0 406.0
+
+f 1 2 3 4 
+f 8 7 6 5
+f 12 11 10 9
+
+usemtl white

premake4.lua

@@ -1,5 +1,5 @@
 sources = {
-   "test.cc",
+   "loader_example.cc",
    }
 
 -- premake4.lua
@@ -21,9 +21,9 @@ solution "TinyObjLoaderSolution"
       configuration "Debug"
          defines { "DEBUG" } -- -DDEBUG
          flags { "Symbols" }
-         targetname "test_tinyobjloader_debug"
+         targetname "loader_example_debug"
 
       configuration "Release"
          -- defines { "NDEBUG" } -- -NDEBUG
          flags { "Symbols", "Optimize" }
-         targetname "test_tinyobjloader"
+         targetname "loader_example"

python/TODO.md

@@ -0,0 +1,2 @@
+* PBR material
+* Define index_t struct

python/main.cpp

@@ -1,160 +1,206 @@
-//python3 module for tinyobjloader
+// python2/3 module for tinyobjloader
 //
-//usage:
+// usage:
 // import tinyobjloader as tol
 // model = tol.LoadObj(name)
 // print(model["shapes"])
 // print(model["materials"]
+// note:
+//   `shape.mesh.index_t` is represented as flattened array: (vertex_index, normal_index, texcoord_index) * num_faces
 
 #include <Python.h>
 #include <vector>
 #include "../tiny_obj_loader.h"
 
 typedef std::vector<double> vectd;
+typedef std::vector<int> vecti;
 
-PyObject*
-pyTupleFromfloat3 (float array[3])
-{
-    int i;
-    PyObject* tuple = PyTuple_New(3);
+PyObject* pyTupleFromfloat3(float array[3]) {
+  int i;
+  PyObject* tuple = PyTuple_New(3);
 
-    for(i=0; i<=2 ; i++){
-        PyTuple_SetItem(tuple, i, PyFloat_FromDouble(array[i]));
-    }
+  for (i = 0; i <= 2; i++) {
+    PyTuple_SetItem(tuple, i, PyFloat_FromDouble(array[i]));
+  }
 
-    return tuple;
+  return tuple;
 }
 
-extern "C"
-{
+extern "C" {
 
-static PyObject*
-pyLoadObj(PyObject* self, PyObject* args)
-{
-    PyObject *rtndict, *pyshapes, *pymaterials,
-             *current, *meshobj;
+static PyObject* pyLoadObj(PyObject* self, PyObject* args) {
+  PyObject *rtndict, *pyshapes, *pymaterials, *pymaterial_indices, *attribobj, *current, *meshobj;
 
-    char const* filename;
-    char *current_name;
-    vectd vect;
+  char const* current_name;
+  char const* filename;
+  vectd vect;
+  std::vector<tinyobj::index_t> indices;
+  std::vector<unsigned char> face_verts;
 
-    std::vector<tinyobj::shape_t> shapes;
-    std::vector<tinyobj::material_t> materials;
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
 
-    if(!PyArg_ParseTuple(args, "s", &filename))
-        return NULL;
+  if (!PyArg_ParseTuple(args, "s", &filename)) return NULL;
 
-    std::string err;
-    tinyobj::LoadObj(shapes, materials, err, filename);
+  std::string err;
+  tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename);
 
-    pyshapes = PyDict_New();
-    pymaterials = PyDict_New();
-    rtndict = PyDict_New();
+  pyshapes = PyDict_New();
+  pymaterials = PyDict_New();
+  pymaterial_indices = PyList_New(0);
+  rtndict = PyDict_New();
 
-    for (std::vector<tinyobj::shape_t>::iterator shape = shapes.begin() ;
-         shape != shapes.end(); shape++)
-    {
-         meshobj = PyDict_New();
-         tinyobj::mesh_t cm  = (*shape).mesh;
+  attribobj = PyDict_New();
 
-         for (int i = 0; i <= 4; i++ )
-         {
-            current = PyList_New(0);
+  for (int i = 0; i <= 2; i++) {
+    current = PyList_New(0);
 
-           switch(i) {
-
-           case 0:
-                current_name = "positions";
-                vect = vectd(cm.positions.begin(), cm.positions.end()); break;
-           case 1:
-                current_name = "normals";
-                vect = vectd(cm.normals.begin(), cm.normals.end()); break;
-           case 2:
-                current_name = "texcoords";
-                vect = vectd(cm.texcoords.begin(), cm.texcoords.end()); break;
-           case 3:
-                current_name = "indicies";
-                vect = vectd(cm.indices.begin(), cm.indices.end()); break;
-           case 4:
-                current_name = "material_ids";
-                vect = vectd(cm.material_ids.begin(), cm.material_ids.end()); break;
-
-            }
-
-           for (vectd::iterator it = vect.begin() ;
-                it != vect.end(); it++)
-            {
-                PyList_Insert(current, it - vect.begin(), PyFloat_FromDouble(*it));
-            }
-
-            PyDict_SetItemString(meshobj, current_name, current);
-
-         }
-
-         PyDict_SetItemString(pyshapes, (*shape).name.c_str(), meshobj);
+    switch (i) {
+      case 0:
+        current_name = "vertices";
+        vect = vectd(attrib.vertices.begin(), attrib.vertices.end());
+        break;
+      case 1:
+        current_name = "normals";
+        vect = vectd(attrib.normals.begin(), attrib.normals.end());
+        break;
+      case 2:
+        current_name = "texcoords";
+        vect = vectd(attrib.texcoords.begin(), attrib.texcoords.end());
+        break;
     }
 
-    for (std::vector<tinyobj::material_t>::iterator mat = materials.begin() ;
-         mat != materials.end(); mat++)
-    {
-        PyObject *matobj = PyDict_New();
-        PyObject *unknown_parameter = PyDict_New();
-
-        for (std::map<std::string, std::string>::iterator p = (*mat).unknown_parameter.begin() ;
-          p != (*mat).unknown_parameter.end(); ++p)
-        {
-            PyDict_SetItemString(unknown_parameter, p->first.c_str(), PyUnicode_FromString(p->second.c_str()));
-        }
-
-        PyDict_SetItemString(matobj, "shininess",  PyFloat_FromDouble((*mat).shininess));
-        PyDict_SetItemString(matobj, "ior",  PyFloat_FromDouble((*mat).ior));
-        PyDict_SetItemString(matobj, "dissolve",  PyFloat_FromDouble((*mat).dissolve));
-        PyDict_SetItemString(matobj, "illum",  PyLong_FromLong((*mat).illum));
-        PyDict_SetItemString(matobj, "ambient_texname", PyUnicode_FromString((*mat).ambient_texname.c_str()));
-        PyDict_SetItemString(matobj, "diffuse_texname", PyUnicode_FromString((*mat).diffuse_texname.c_str()));
-        PyDict_SetItemString(matobj, "specular_texname", PyUnicode_FromString((*mat).specular_texname.c_str()));
-        PyDict_SetItemString(matobj, "specular_highlight_texname", PyUnicode_FromString((*mat).specular_highlight_texname.c_str()));
-        PyDict_SetItemString(matobj, "bump_texname", PyUnicode_FromString((*mat).bump_texname.c_str()));
-        PyDict_SetItemString(matobj, "displacement_texname", PyUnicode_FromString((*mat).displacement_texname.c_str()));
-        PyDict_SetItemString(matobj, "alpha_texname", PyUnicode_FromString((*mat).alpha_texname.c_str()));
-        PyDict_SetItemString(matobj, "ambient", pyTupleFromfloat3((*mat).ambient));
-        PyDict_SetItemString(matobj, "diffuse", pyTupleFromfloat3((*mat).diffuse));
-        PyDict_SetItemString(matobj, "specular", pyTupleFromfloat3((*mat).specular));
-        PyDict_SetItemString(matobj, "transmittance", pyTupleFromfloat3((*mat).transmittance));
-        PyDict_SetItemString(matobj, "emission", pyTupleFromfloat3((*mat).emission));
-        PyDict_SetItemString(matobj, "unknown_parameter", unknown_parameter);
-
-        PyDict_SetItemString(pymaterials, (*mat).name.c_str(), matobj);
+    for (vectd::iterator it = vect.begin(); it != vect.end(); it++) {
+      PyList_Insert(current, it - vect.begin(), PyFloat_FromDouble(*it));
     }
 
-    PyDict_SetItemString(rtndict, "shapes", pyshapes);
-    PyDict_SetItemString(rtndict, "materials", pymaterials);
+    PyDict_SetItemString(attribobj, current_name, current);
+  }
 
-    return rtndict;
+  for (std::vector<tinyobj::shape_t>::iterator shape = shapes.begin();
+       shape != shapes.end(); shape++) {
+    meshobj = PyDict_New();
+    tinyobj::mesh_t cm = (*shape).mesh;
+
+    {
+      current = PyList_New(0);
+
+      for (size_t i = 0; i < cm.indices.size(); i++) {
+        // Flatten index array: v_idx, vn_idx, vt_idx, v_idx, vn_idx, vt_idx,
+        // ...
+        PyList_Insert(current, 3 * i + 0,
+                      PyLong_FromLong(cm.indices[i].vertex_index));
+        PyList_Insert(current, 3 * i + 1,
+                      PyLong_FromLong(cm.indices[i].normal_index));
+        PyList_Insert(current, 3 * i + 2,
+                      PyLong_FromLong(cm.indices[i].texcoord_index));
+      }
+
+      PyDict_SetItemString(meshobj, "indices", current);
+    }
+
+    {
+      current = PyList_New(0);
+
+      for (size_t i = 0; i < cm.num_face_vertices.size(); i++) {
+        // Widen data type to long.
+        PyList_Insert(current, i, PyLong_FromLong(cm.num_face_vertices[i]));
+      }
+
+      PyDict_SetItemString(meshobj, "num_face_vertices", current);
+    }
+
+    {
+      current = PyList_New(0);
+
+      for (size_t i = 0; i < cm.material_ids.size(); i++) {
+        PyList_Insert(current, i, PyLong_FromLong(cm.material_ids[i]));
+      }
+
+      PyDict_SetItemString(meshobj, "material_ids", current);
+    }
+
+    PyDict_SetItemString(pyshapes, (*shape).name.c_str(), meshobj);
+  }
+
+  for (std::vector<tinyobj::material_t>::iterator mat = materials.begin();
+       mat != materials.end(); mat++) {
+    PyObject* matobj = PyDict_New();
+    PyObject* unknown_parameter = PyDict_New();
+
+    for (std::map<std::string, std::string>::iterator p =
+             mat->unknown_parameter.begin();
+         p != mat->unknown_parameter.end(); ++p) {
+      PyDict_SetItemString(unknown_parameter, p->first.c_str(),
+                           PyUnicode_FromString(p->second.c_str()));
+    }
+
+    PyDict_SetItemString(matobj, "shininess",
+                         PyFloat_FromDouble(mat->shininess));
+    PyDict_SetItemString(matobj, "ior", PyFloat_FromDouble(mat->ior));
+    PyDict_SetItemString(matobj, "dissolve",
+                         PyFloat_FromDouble(mat->dissolve));
+    PyDict_SetItemString(matobj, "illum", PyLong_FromLong(mat->illum));
+    PyDict_SetItemString(matobj, "ambient_texname",
+                         PyUnicode_FromString(mat->ambient_texname.c_str()));
+    PyDict_SetItemString(matobj, "diffuse_texname",
+                         PyUnicode_FromString(mat->diffuse_texname.c_str()));
+    PyDict_SetItemString(matobj, "specular_texname",
+                         PyUnicode_FromString(mat->specular_texname.c_str()));
+    PyDict_SetItemString(
+        matobj, "specular_highlight_texname",
+        PyUnicode_FromString(mat->specular_highlight_texname.c_str()));
+    PyDict_SetItemString(matobj, "bump_texname",
+                         PyUnicode_FromString(mat->bump_texname.c_str()));
+    PyDict_SetItemString(
+        matobj, "displacement_texname",
+        PyUnicode_FromString(mat->displacement_texname.c_str()));
+    PyDict_SetItemString(matobj, "alpha_texname",
+                         PyUnicode_FromString(mat->alpha_texname.c_str()));
+    PyDict_SetItemString(matobj, "ambient", pyTupleFromfloat3(mat->ambient));
+    PyDict_SetItemString(matobj, "diffuse", pyTupleFromfloat3(mat->diffuse));
+    PyDict_SetItemString(matobj, "specular",
+                         pyTupleFromfloat3(mat->specular));
+    PyDict_SetItemString(matobj, "transmittance",
+                         pyTupleFromfloat3(mat->transmittance));
+    PyDict_SetItemString(matobj, "emission",
+                         pyTupleFromfloat3(mat->emission));
+    PyDict_SetItemString(matobj, "unknown_parameter", unknown_parameter);
+
+    PyDict_SetItemString(pymaterials, mat->name.c_str(), matobj);
+    PyList_Append(pymaterial_indices, PyUnicode_FromString(mat->name.c_str()));
+  }
+
+  PyDict_SetItemString(rtndict, "shapes", pyshapes);
+  PyDict_SetItemString(rtndict, "materials", pymaterials);
+  PyDict_SetItemString(rtndict, "material_indices", pymaterial_indices);
+  PyDict_SetItemString(rtndict, "attribs", attribobj);
+
+  return rtndict;
 }
 
-
 static PyMethodDef mMethods[] = {
 
-{"LoadObj", pyLoadObj, METH_VARARGS},
-{NULL, NULL, 0, NULL}
+    {"LoadObj", pyLoadObj, METH_VARARGS}, {NULL, NULL, 0, NULL}
 
 };
 
+#if PY_MAJOR_VERSION >= 3
 
-static struct PyModuleDef moduledef = {
-    PyModuleDef_HEAD_INIT,
-    "tinyobjloader",
-    NULL,
-    -1,
-    mMethods
-};
+static struct PyModuleDef moduledef = {PyModuleDef_HEAD_INIT, "tinyobjloader",
+                                       NULL, -1, mMethods};
 
-
-PyMODINIT_FUNC
-PyInit_tinyobjloader(void)
-{
-    return PyModule_Create(&moduledef);
+PyMODINIT_FUNC PyInit_tinyobjloader(void) {
+  return PyModule_Create(&moduledef);
 }
 
+#else
+
+PyMODINIT_FUNC inittinyobjloader(void) {
+  Py_InitModule3("tinyobjloader", mMethods, NULL);
+}
+
+#endif  // PY_MAJOR_VERSION >= 3
+
 }

test.cc

@@ -1,278 +0,0 @@
-#define TINYOBJLOADER_IMPLEMENTATION
-#include "tiny_obj_loader.h"
-
-#include <cstdio>
-#include <cstdlib>
-#include <cassert>
-#include <iostream>
-#include <sstream>
-#include <fstream>
-
-static void PrintInfo(const std::vector<tinyobj::shape_t>& shapes, const std::vector<tinyobj::material_t>& materials, bool triangulate = true)
-{
-  std::cout << "# of shapes    : " << shapes.size() << std::endl;
-  std::cout << "# of materials : " << materials.size() << std::endl;
-
-  for (size_t i = 0; i < shapes.size(); i++) {
-    printf("shape[%ld].name = %s\n", i, shapes[i].name.c_str());
-    printf("Size of shape[%ld].indices: %ld\n", i, shapes[i].mesh.indices.size());
-
-    if (triangulate)
-    {
-        printf("Size of shape[%ld].material_ids: %ld\n", i, shapes[i].mesh.material_ids.size());
-        assert((shapes[i].mesh.indices.size() % 3) == 0);
-        for (size_t f = 0; f < shapes[i].mesh.indices.size() / 3; f++) {
-          printf("  idx[%ld] = %d, %d, %d. mat_id = %d\n", f, shapes[i].mesh.indices[3*f+0], shapes[i].mesh.indices[3*f+1], shapes[i].mesh.indices[3*f+2], shapes[i].mesh.material_ids[f]);
-        }
-    } else {
-      for (size_t f = 0; f < shapes[i].mesh.indices.size(); f++) {
-        printf("  idx[%ld] = %d\n", f, shapes[i].mesh.indices[f]);
-      }
-
-      printf("Size of shape[%ld].material_ids: %ld\n", i, shapes[i].mesh.material_ids.size());
-      assert(shapes[i].mesh.material_ids.size() == shapes[i].mesh.num_vertices.size());
-      for (size_t m = 0; m < shapes[i].mesh.material_ids.size(); m++) {
-        printf("  material_id[%ld] = %d\n", m,
-          shapes[i].mesh.material_ids[m]);
-      }
-
-    }
-
-    printf("shape[%ld].num_faces: %ld\n", i, shapes[i].mesh.num_vertices.size());
-    for (size_t v = 0; v < shapes[i].mesh.num_vertices.size(); v++) {
-      printf("  num_vertices[%ld] = %ld\n", v,
-        static_cast<long>(shapes[i].mesh.num_vertices[v]));
-    }
-
-    printf("shape[%ld].vertices: %ld\n", i, shapes[i].mesh.positions.size());
-    assert((shapes[i].mesh.positions.size() % 3) == 0);
-    for (size_t v = 0; v < shapes[i].mesh.positions.size() / 3; v++) {
-      printf("  v[%ld] = (%f, %f, %f)\n", v,
-        shapes[i].mesh.positions[3*v+0],
-        shapes[i].mesh.positions[3*v+1],
-        shapes[i].mesh.positions[3*v+2]);
-    }
-
-    printf("shape[%ld].num_tags: %ld\n", i, shapes[i].mesh.tags.size());
-    for (size_t t = 0; t < shapes[i].mesh.tags.size(); t++) {
-      printf("  tag[%ld] = %s ", t, shapes[i].mesh.tags[t].name.c_str());
-      printf(" ints: [");
-      for (size_t j = 0; j < shapes[i].mesh.tags[t].intValues.size(); ++j)
-      {
-          printf("%ld", static_cast<long>(shapes[i].mesh.tags[t].intValues[j]));
-          if (j < (shapes[i].mesh.tags[t].intValues.size()-1))
-          {
-              printf(", ");
-          }
-      }
-      printf("]");
-
-      printf(" floats: [");
-      for (size_t j = 0; j < shapes[i].mesh.tags[t].floatValues.size(); ++j)
-      {
-          printf("%f", shapes[i].mesh.tags[t].floatValues[j]);
-          if (j < (shapes[i].mesh.tags[t].floatValues.size()-1))
-          {
-              printf(", ");
-          }
-      }
-      printf("]");
-
-      printf(" strings: [");
-      for (size_t j = 0; j < shapes[i].mesh.tags[t].stringValues.size(); ++j)
-      {
-          printf("%s", shapes[i].mesh.tags[t].stringValues[j].c_str());
-          if (j < (shapes[i].mesh.tags[t].stringValues.size()-1))
-          {
-              printf(", ");
-          }
-      }
-      printf("]");
-      printf("\n");
-    }
-  }
-
-  for (size_t i = 0; i < materials.size(); i++) {
-    printf("material[%ld].name = %s\n", i, materials[i].name.c_str());
-    printf("  material.Ka = (%f, %f ,%f)\n", materials[i].ambient[0], materials[i].ambient[1], materials[i].ambient[2]);
-    printf("  material.Kd = (%f, %f ,%f)\n", materials[i].diffuse[0], materials[i].diffuse[1], materials[i].diffuse[2]);
-    printf("  material.Ks = (%f, %f ,%f)\n", materials[i].specular[0], materials[i].specular[1], materials[i].specular[2]);
-    printf("  material.Tr = (%f, %f ,%f)\n", materials[i].transmittance[0], materials[i].transmittance[1], materials[i].transmittance[2]);
-    printf("  material.Ke = (%f, %f ,%f)\n", materials[i].emission[0], materials[i].emission[1], materials[i].emission[2]);
-    printf("  material.Ns = %f\n", materials[i].shininess);
-    printf("  material.Ni = %f\n", materials[i].ior);
-    printf("  material.dissolve = %f\n", materials[i].dissolve);
-    printf("  material.illum = %d\n", materials[i].illum);
-    printf("  material.map_Ka = %s\n", materials[i].ambient_texname.c_str());
-    printf("  material.map_Kd = %s\n", materials[i].diffuse_texname.c_str());
-    printf("  material.map_Ks = %s\n", materials[i].specular_texname.c_str());
-    printf("  material.map_Ns = %s\n", materials[i].specular_highlight_texname.c_str());
-    printf("  material.map_bump = %s\n", materials[i].bump_texname.c_str());
-    printf("  material.map_d = %s\n", materials[i].alpha_texname.c_str());
-    printf("  material.disp = %s\n", materials[i].displacement_texname.c_str());
-    std::map<std::string, std::string>::const_iterator it(materials[i].unknown_parameter.begin());
-    std::map<std::string, std::string>::const_iterator itEnd(materials[i].unknown_parameter.end());
-
-    for (; it != itEnd; it++) {
-      printf("  material.%s = %s\n", it->first.c_str(), it->second.c_str());
-    }
-    printf("\n");
-  }
-}
-
-static bool
-TestLoadObj(
-  const char* filename,
-  const char* basepath = NULL,
-  bool triangulate = true)
-{
-  std::cout << "Loading " << filename << std::endl;
-
-  std::vector<tinyobj::shape_t> shapes;
-  std::vector<tinyobj::material_t> materials;
-
-  std::string err;
-  bool ret = tinyobj::LoadObj(shapes, materials, err, filename, basepath, triangulate);
-
-  if (!err.empty()) {
-    std::cerr << err << std::endl;
-  }
-
-  if (!ret) {
-    printf("Failed to load/parse .obj.\n");
-    return false;
-  }
-
-  PrintInfo(shapes, materials, triangulate);
-
-  return true;
-}
-
-
-static bool
-TestStreamLoadObj()
-{
-  std::cout << "Stream Loading " << std::endl;
-
-  std::stringstream objStream;
-  objStream
-    << "mtllib cube.mtl\n"
-    "\n"
-    "v 0.000000 2.000000 2.000000\n"
-    "v 0.000000 0.000000 2.000000\n"
-    "v 2.000000 0.000000 2.000000\n"
-    "v 2.000000 2.000000 2.000000\n"
-    "v 0.000000 2.000000 0.000000\n"
-    "v 0.000000 0.000000 0.000000\n"
-    "v 2.000000 0.000000 0.000000\n"
-    "v 2.000000 2.000000 0.000000\n"
-    "# 8 vertices\n"
-    "\n"
-    "g front cube\n"
-    "usemtl white\n"
-    "f 1 2 3 4\n"
-    "g back cube\n"
-    "# expects white material\n"
-    "f 8 7 6 5\n"
-    "g right cube\n"
-    "usemtl red\n"
-    "f 4 3 7 8\n"
-    "g top cube\n"
-    "usemtl white\n"
-    "f 5 1 4 8\n"
-    "g left cube\n"
-    "usemtl green\n"
-    "f 5 6 2 1\n"
-    "g bottom cube\n"
-    "usemtl white\n"
-    "f 2 6 7 3\n"
-    "# 6 elements";
-
-std::string matStream(
-    "newmtl white\n"
-    "Ka 0 0 0\n"
-    "Kd 1 1 1\n"
-    "Ks 0 0 0\n"
-    "\n"
-    "newmtl red\n"
-    "Ka 0 0 0\n"
-    "Kd 1 0 0\n"
-    "Ks 0 0 0\n"
-    "\n"
-    "newmtl green\n"
-    "Ka 0 0 0\n"
-    "Kd 0 1 0\n"
-    "Ks 0 0 0\n"
-    "\n"
-    "newmtl blue\n"
-    "Ka 0 0 0\n"
-    "Kd 0 0 1\n"
-    "Ks 0 0 0\n"
-    "\n"
-    "newmtl light\n"
-    "Ka 20 20 20\n"
-    "Kd 1 1 1\n"
-    "Ks 0 0 0");
-
-    using namespace tinyobj;
-    class MaterialStringStreamReader:
-        public MaterialReader
-    {
-        public:
-            MaterialStringStreamReader(const std::string& matSStream): m_matSStream(matSStream) {}
-            virtual ~MaterialStringStreamReader() {}
-            virtual bool operator() (
-              const std::string& matId,
-              std::vector<material_t>& materials,
-              std::map<std::string, int>& matMap,
-              std::string& err)
-            {
-                (void)matId;
-                (void)err;
-                LoadMtl(matMap, materials, m_matSStream);
-                return true;
-            }
-
-        private:
-            std::stringstream m_matSStream;
-    };
-
-  MaterialStringStreamReader matSSReader(matStream);
-  std::vector<tinyobj::shape_t> shapes;
-  std::vector<tinyobj::material_t> materials;
-  std::string err;
-  bool ret = tinyobj::LoadObj(shapes, materials, err, objStream, matSSReader);    
-  
-  if (!err.empty()) {
-    std::cerr << err << std::endl;
-  }
-
-  if (!ret) {
-    return false;
-  }
-
-  PrintInfo(shapes, materials);
-    
-  return true;
-}
-
-int
-main(
-  int argc,
-  char **argv)
-{
-  if (argc > 1) {
-    const char* basepath = NULL;
-    if (argc > 2) {
-      basepath = argv[2];
-    }
-    assert(true == TestLoadObj(argv[1], basepath));
-  } else {
-    //assert(true == TestLoadObj("cornell_box.obj"));
-    //assert(true == TestLoadObj("cube.obj"));
-    assert(true == TestStreamLoadObj());
-    assert(true == TestLoadObj("catmark_torus_creases0.obj", NULL, false));
-  }
-
-  return 0;
-}

tests/Makefile

@@ -0,0 +1,16 @@
+.PHONY: clean
+
+CXX ?= g++
+CXXFLAGS ?= -g -O2
+
+tester: tester.cc
+	$(CXX) $(CXXFLAGS) -o tester tester.cc
+
+all: tester
+
+check: tester
+	./tester	
+
+clean:
+	rm -rf tester
+

tests/README.md

@@ -0,0 +1,37 @@
+# Build&Test
+
+## Use makefile
+
+    $ make check
+
+## Use ninja + kuroga
+
+Assume
+
+* ninja 1.4+
+* python 2.6+
+
+Are installed.
+
+### Linux/MacOSX
+
+    $ python kuroga.py config-posix.py
+    $ ninja
+
+### Windows
+
+Visual Studio 2013 is required to build tester.
+
+On Windows console.
+
+    > python kuroga.py config-msvc.py
+    > vcbuild.bat
+
+
+Or on msys2 bash,
+
+    $ python kuroga.py config-msvc.py
+    $ cmd //c vcbuild.bat
+
+ 
+

tests/config-msvc.py

@@ -0,0 +1,52 @@
+exe = "tester.exe"
+
+toolchain = "msvc"
+
+# optional
+link_pool_depth = 1
+
+# optional
+builddir = {
+    "gnu" :  "build"
+  , "msvc" :  "build"
+  , "clang" :  "build"
+    }
+
+includes = {
+    "gnu" : [ "-I." ]
+  , "msvc" : [ "/I." ]
+  , "clang" : [ "-I." ]
+    }
+
+defines = {
+    "gnu" : [ "-DEXAMPLE=1" ]
+  , "msvc" : [ "/DEXAMPLE=1" ]
+  , "clang" : [ "-DEXAMPLE=1" ]
+    }
+
+cflags = {
+    "gnu" : [ "-O2", "-g" ]
+  , "msvc" : [ "/O2" ]
+  , "clang" : [ "-O2", "-g" ]
+    }
+
+cxxflags = {
+    "gnu" : [ "-O2", "-g" ]
+  , "msvc" : [ "/O2", "/W4", "/EHsc"]
+  , "clang" : [ "-O2", "-g", "-fsanitize=address" ]
+    }
+
+ldflags = {
+    "gnu" : [ ]
+  , "msvc" : [ ]
+  , "clang" : [ "-fsanitize=address" ]
+    }
+
+# optionsl
+cxx_files = [ "tester.cc" ]
+c_files = [ ]
+
+# You can register your own toolchain through register_toolchain function
+def register_toolchain(ninja):
+    pass
+

tests/config-posix.py

@@ -0,0 +1,53 @@
+exe = "tester"
+
+# "gnu" or "clang"
+toolchain = "gnu"
+
+# optional
+link_pool_depth = 1
+
+# optional
+builddir = {
+    "gnu" :  "build"
+  , "msvc" :  "build"
+  , "clang" :  "build"
+    }
+
+includes = {
+    "gnu" : [ "-I." ]
+  , "msvc" : [ "/I." ]
+  , "clang" : [ "-I." ]
+    }
+
+defines = {
+    "gnu" : [ ]
+  , "msvc" : [ ]
+  , "clang" : [  ]
+    }
+
+cflags = {
+    "gnu" : [ "-O2", "-g" ]
+  , "msvc" : [ "/O2" ]
+  , "clang" : [ "-O2", "-g" ]
+    }
+
+# Warn as much as possible: http://qiita.com/MitsutakaTakeda/items/6b9966f890cc9b944d75
+cxxflags = {
+    "gnu" : [ "-O2", "-g", "-pedantic -Wall -Wextra -Wcast-align -Wcast-qual -Wctor-dtor-privacy -Wdisabled-optimization -Wformat=2 -Winit-self -Wmissing-declarations -Wmissing-include-dirs -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wshadow -Wsign-conversion -Wsign-promo -Wstrict-overflow=5 -Wswitch-default -Wundef -Werror -Wno-unused", "-fsanitize=address" ]
+  , "msvc" : [ "/O2", "/W4" ]
+  , "clang" : [ "-O2", "-g", "-Werror -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic", "-fsanitize=address" ]
+    }
+
+ldflags = {
+    "gnu" : [ "-fsanitize=address" ]
+  , "msvc" : [ ]
+  , "clang" : [ "-fsanitize=address" ]
+    }
+
+cxx_files = [ "tester.cc" ]
+c_files = [ ]
+
+# You can register your own toolchain through register_toolchain function
+def register_toolchain(ninja):
+    pass
+

tests/kuroga.py

@@ -0,0 +1,312 @@
+#!/usr/bin/env python
+
+#
+# Kuroga, single python file meta-build system for ninja
+# https://github.com/lighttransport/kuroga
+#
+# Requirements: python 2.6 or 2.7
+#
+# Usage: $ python kuroga.py input.py
+#
+
+import imp
+import re
+import textwrap
+import glob
+import os
+import sys
+
+# gcc preset
+def add_gnu_rule(ninja):
+    ninja.rule('gnucxx', description='CXX $out',
+        command='$gnucxx -MMD -MF $out.d $gnudefines $gnuincludes $gnucxxflags -c $in -o $out',
+        depfile='$out.d', deps='gcc')
+    ninja.rule('gnucc', description='CC $out',
+        command='$gnucc -MMD -MF $out.d $gnudefines $gnuincludes $gnucflags -c $in -o $out',
+        depfile='$out.d', deps='gcc')
+    ninja.rule('gnulink', description='LINK $out', pool='link_pool',
+        command='$gnuld -o $out $in $libs $gnuldflags')
+    ninja.rule('gnuar', description='AR $out', pool='link_pool',
+        command='$gnuar rsc $out $in')
+    ninja.rule('gnustamp', description='STAMP $out', command='touch $out')
+    ninja.newline()
+
+    ninja.variable('gnucxx', 'g++')
+    ninja.variable('gnucc', 'gcc')
+    ninja.variable('gnuld', '$gnucxx')
+    ninja.variable('gnuar', 'ar')
+    ninja.newline()
+
+# clang preset
+def add_clang_rule(ninja):
+    ninja.rule('clangcxx', description='CXX $out',
+        command='$clangcxx -MMD -MF $out.d $clangdefines $clangincludes $clangcxxflags -c $in -o $out',
+        depfile='$out.d', deps='gcc')
+    ninja.rule('clangcc', description='CC $out',
+        command='$clangcc -MMD -MF $out.d $clangdefines $clangincludes $clangcflags -c $in -o $out',
+        depfile='$out.d', deps='gcc')
+    ninja.rule('clanglink', description='LINK $out', pool='link_pool',
+        command='$clangld -o $out $in $libs $clangldflags')
+    ninja.rule('clangar', description='AR $out', pool='link_pool',
+        command='$clangar rsc $out $in')
+    ninja.rule('clangstamp', description='STAMP $out', command='touch $out')
+    ninja.newline()
+
+    ninja.variable('clangcxx', 'clang++')
+    ninja.variable('clangcc', 'clang')
+    ninja.variable('clangld', '$clangcxx')
+    ninja.variable('clangar', 'ar')
+    ninja.newline()
+
+# msvc preset
+def add_msvc_rule(ninja):
+    ninja.rule('msvccxx', description='CXX $out',
+        command='$msvccxx /TP /showIncludes $msvcdefines $msvcincludes $msvccxxflags -c $in /Fo$out',
+        depfile='$out.d', deps='msvc')
+    ninja.rule('msvccc', description='CC $out',
+        command='$msvccc /TC /showIncludes $msvcdefines $msvcincludes $msvccflags -c $in /Fo$out',
+        depfile='$out.d', deps='msvc')
+    ninja.rule('msvclink', description='LINK $out', pool='link_pool',
+        command='$msvcld $msvcldflags $in $libs /OUT:$out')
+    ninja.rule('msvcar', description='AR $out', pool='link_pool',
+        command='$msvcar $in /OUT:$out')
+    #ninja.rule('msvcstamp', description='STAMP $out', command='touch $out')
+    ninja.newline()
+
+    ninja.variable('msvccxx', 'cl.exe')
+    ninja.variable('msvccc', 'cl.exe')
+    ninja.variable('msvcld', 'link.exe')
+    ninja.variable('msvcar', 'lib.exe')
+    ninja.newline()
+
+# -- from ninja_syntax.py --
+def escape_path(word):
+    return word.replace('$ ', '$$ ').replace(' ', '$ ').replace(':', '$:')
+
+class Writer(object):
+    def __init__(self, output, width=78):
+        self.output = output
+        self.width = width
+
+    def newline(self):
+        self.output.write('\n')
+
+    def comment(self, text, has_path=False):
+        for line in textwrap.wrap(text, self.width - 2, break_long_words=False,
+                                  break_on_hyphens=False):
+            self.output.write('# ' + line + '\n')
+
+    def variable(self, key, value, indent=0):
+        if value is None:
+            return
+        if isinstance(value, list):
+            value = ' '.join(filter(None, value))  # Filter out empty strings.
+        self._line('%s = %s' % (key, value), indent)
+
+    def pool(self, name, depth):
+        self._line('pool %s' % name)
+        self.variable('depth', depth, indent=1)
+
+    def rule(self, name, command, description=None, depfile=None,
+             generator=False, pool=None, restat=False, rspfile=None,
+             rspfile_content=None, deps=None):
+        self._line('rule %s' % name)
+        self.variable('command', command, indent=1)
+        if description:
+            self.variable('description', description, indent=1)
+        if depfile:
+            self.variable('depfile', depfile, indent=1)
+        if generator:
+            self.variable('generator', '1', indent=1)
+        if pool:
+            self.variable('pool', pool, indent=1)
+        if restat:
+            self.variable('restat', '1', indent=1)
+        if rspfile:
+            self.variable('rspfile', rspfile, indent=1)
+        if rspfile_content:
+            self.variable('rspfile_content', rspfile_content, indent=1)
+        if deps:
+            self.variable('deps', deps, indent=1)
+
+    def build(self, outputs, rule, inputs=None, implicit=None, order_only=None,
+              variables=None):
+        outputs = as_list(outputs)
+        out_outputs = [escape_path(x) for x in outputs]
+        all_inputs = [escape_path(x) for x in as_list(inputs)]
+
+        if implicit:
+            implicit = [escape_path(x) for x in as_list(implicit)]
+            all_inputs.append('|')
+            all_inputs.extend(implicit)
+        if order_only:
+            order_only = [escape_path(x) for x in as_list(order_only)]
+            all_inputs.append('||')
+            all_inputs.extend(order_only)
+
+        self._line('build %s: %s' % (' '.join(out_outputs),
+                                     ' '.join([rule] + all_inputs)))
+
+        if variables:
+            if isinstance(variables, dict):
+                iterator = iter(variables.items())
+            else:
+                iterator = iter(variables)
+
+            for key, val in iterator:
+                self.variable(key, val, indent=1)
+
+        return outputs
+
+    def include(self, path):
+        self._line('include %s' % path)
+
+    def subninja(self, path):
+        self._line('subninja %s' % path)
+
+    def default(self, paths):
+        self._line('default %s' % ' '.join(as_list(paths)))
+
+    def _count_dollars_before_index(self, s, i):
+        """Returns the number of '$' characters right in front of s[i]."""
+        dollar_count = 0
+        dollar_index = i - 1
+        while dollar_index > 0 and s[dollar_index] == '$':
+            dollar_count += 1
+            dollar_index -= 1
+        return dollar_count
+
+    def _line(self, text, indent=0):
+        """Write 'text' word-wrapped at self.width characters."""
+        leading_space = '  ' * indent
+        while len(leading_space) + len(text) > self.width:
+            # The text is too wide; wrap if possible.
+
+            # Find the rightmost space that would obey our width constraint and
+            # that's not an escaped space.
+            available_space = self.width - len(leading_space) - len(' $')
+            space = available_space
+            while True:
+                space = text.rfind(' ', 0, space)
+                if (space < 0 or
+                    self._count_dollars_before_index(text, space) % 2 == 0):
+                    break
+
+            if space < 0:
+                # No such space; just use the first unescaped space we can find.
+                space = available_space - 1
+                while True:
+                    space = text.find(' ', space + 1)
+                    if (space < 0 or
+                        self._count_dollars_before_index(text, space) % 2 == 0):
+                        break
+            if space < 0:
+                # Give up on breaking.
+                break
+
+            self.output.write(leading_space + text[0:space] + ' $\n')
+            text = text[space+1:]
+
+            # Subsequent lines are continuations, so indent them.
+            leading_space = '  ' * (indent+2)
+
+        self.output.write(leading_space + text + '\n')
+
+    def close(self):
+        self.output.close()
+
+
+def as_list(input):
+    if input is None:
+        return []
+    if isinstance(input, list):
+        return input
+    return [input]
+
+# -- end from ninja_syntax.py --
+
+def gen(ninja, toolchain, config):
+    
+    ninja.variable('ninja_required_version', '1.4')
+    ninja.newline()
+
+    if hasattr(config, "builddir"):
+        builddir = config.builddir[toolchain]
+        ninja.variable(toolchain + 'builddir', builddir)
+    else:
+        builddir = ''
+
+    ninja.variable(toolchain + 'defines', config.defines[toolchain] or [])
+    ninja.variable(toolchain + 'includes', config.includes[toolchain] or [])
+    ninja.variable(toolchain + 'cflags', config.cflags[toolchain] or [])
+    ninja.variable(toolchain + 'cxxflags', config.cxxflags[toolchain] or [])
+    ninja.variable(toolchain + 'ldflags', config.ldflags[toolchain] or [])
+    ninja.newline()
+
+    if hasattr(config, "link_pool_depth"):
+        ninja.pool('link_pool', depth=config.link_pool_depth)
+    else:
+        ninja.pool('link_pool', depth=4)
+    ninja.newline()
+
+    # Add default toolchain(gnu, clang and msvc)
+    add_gnu_rule(ninja)
+    add_clang_rule(ninja)
+    add_msvc_rule(ninja)
+
+    obj_files = []
+
+    cc = toolchain + 'cc'
+    cxx = toolchain + 'cxx'
+    link = toolchain + 'link'
+    ar = toolchain + 'ar'
+    
+    if hasattr(config, "cxx_files"):
+        for src in config.cxx_files:
+            srcfile = src
+            obj = os.path.splitext(srcfile)[0] + '.o'
+            obj = os.path.join(builddir, obj);
+            obj_files.append(obj)
+            ninja.build(obj, cxx, srcfile)
+        ninja.newline()
+
+    if hasattr(config, "c_files"):
+        for src in config.c_files:
+            srcfile = src
+            obj = os.path.splitext(srcfile)[0] + '.o'
+            obj = os.path.join(builddir, obj);
+            obj_files.append(obj)
+            ninja.build(obj, cc, srcfile)
+        ninja.newline()
+
+    targetlist = []
+    if hasattr(config, "exe"):
+        ninja.build(config.exe, link, obj_files)
+        targetlist.append(config.exe)
+
+    if hasattr(config, "staticlib"):
+        ninja.build(config.staticlib, ar, obj_files)
+        targetlist.append(config.staticlib)
+
+    ninja.build('all', 'phony', targetlist)
+    ninja.newline()
+        
+    ninja.default('all')
+
+def main():
+    if len(sys.argv) < 2:
+        print("Usage: python kuroga.py config.py")
+        sys.exit(1)
+
+    config = imp.load_source("config", sys.argv[1])
+
+    f = open('build.ninja', 'w')
+    ninja = Writer(f)
+
+    if hasattr(config, "register_toolchain"):
+        config.register_toolchain(ninja)
+        
+    gen(ninja, config.toolchain, config)
+    f.close()
+
+main()

tests/tester.cc

@@ -0,0 +1,742 @@
+#define TINYOBJLOADER_IMPLEMENTATION
+#include "../tiny_obj_loader.h"
+
+#define CATCH_CONFIG_MAIN  // This tells Catch to provide a main() - only do this in one cpp file
+#include "catch.hpp"
+
+#include <cstdio>
+#include <cstdlib>
+#include <cassert>
+#include <iostream>
+#include <sstream>
+#include <fstream>
+
+static void PrintInfo(const tinyobj::attrib_t &attrib, const std::vector<tinyobj::shape_t>& shapes, const std::vector<tinyobj::material_t>& materials, bool triangulate = true)
+{
+  std::cout << "# of vertices  : " << (attrib.vertices.size() / 3) << std::endl;
+  std::cout << "# of normals   : " << (attrib.normals.size() / 3) << std::endl;
+  std::cout << "# of texcoords : " << (attrib.texcoords.size() / 2) << std::endl;
+
+  std::cout << "# of shapes    : " << shapes.size() << std::endl;
+  std::cout << "# of materials : " << materials.size() << std::endl;
+
+  for (size_t v = 0; v < attrib.vertices.size() / 3; v++) {
+    printf("  v[%ld] = (%f, %f, %f)\n", v,
+      static_cast<const double>(attrib.vertices[v].x),
+      static_cast<const double>(attrib.vertices[v].y),
+      static_cast<const double>(attrib.vertices[v].z));
+  }
+
+  for (size_t v = 0; v < attrib.normals.size() / 3; v++) {
+    printf("  n[%ld] = (%f, %f, %f)\n", v,
+      static_cast<const double>(attrib.normals[v].x),
+      static_cast<const double>(attrib.normals[v].y),
+      static_cast<const double>(attrib.normals[v].z));
+  }
+
+  for (size_t v = 0; v < attrib.texcoords.size() / 2; v++) {
+    printf("  uv[%ld] = (%f, %f)\n", v,
+      static_cast<const double>(attrib.texcoords[v].x),
+      static_cast<const double>(attrib.texcoords[v].y));
+  }
+
+  for (size_t i = 0; i < shapes.size(); i++) {
+    printf("shape[%ld].name = %s\n", i, shapes[i].name.c_str());
+    printf("Size of shape[%ld].indices: %ld\n", i, shapes[i].mesh.indices.size());
+
+    if (triangulate)
+    {
+        printf("Size of shape[%ld].material_ids: %ld\n", i, shapes[i].mesh.material_ids.size());
+        assert((shapes[i].mesh.indices.size() % 3) == 0);
+        for (size_t f = 0; f < shapes[i].mesh.indices.size() / 3; f++) {
+          tinyobj::index_t i0 = shapes[i].mesh.indices[3*f+0];
+          tinyobj::index_t i1 = shapes[i].mesh.indices[3*f+1];
+          tinyobj::index_t i2 = shapes[i].mesh.indices[3*f+2];
+          printf("  idx[%ld] = %d/%d/%d, %d/%d/%d, %d/%d/%d. mat_id = %d\n", f,
+            i0.vertex_index, i0.normal_index, i0.texcoord_index,
+            i1.vertex_index, i1.normal_index, i1.texcoord_index,
+            i2.vertex_index, i2.normal_index, i2.texcoord_index,
+            shapes[i].mesh.material_ids[f]);
+        }
+    } else {
+      for (size_t f = 0; f < shapes[i].mesh.indices.size(); f++) {
+        tinyobj::index_t idx = shapes[i].mesh.indices[f];
+        printf("  idx[%ld] = %d/%d/%d\n", f, idx.vertex_index, idx.normal_index, idx.texcoord_index);
+      }
+
+      printf("Size of shape[%ld].material_ids: %ld\n", i, shapes[i].mesh.material_ids.size());
+      assert(shapes[i].mesh.material_ids.size() == shapes[i].mesh.num_face_vertices.size());
+      for (size_t m = 0; m < shapes[i].mesh.material_ids.size(); m++) {
+        printf("  material_id[%ld] = %d\n", m,
+          shapes[i].mesh.material_ids[m]);
+      }
+
+    }
+
+    printf("shape[%ld].num_faces: %ld\n", i, shapes[i].mesh.num_face_vertices.size());
+    for (size_t v = 0; v < shapes[i].mesh.num_face_vertices.size(); v++) {
+      printf("  num_vertices[%ld] = %ld\n", v,
+        static_cast<long>(shapes[i].mesh.num_face_vertices[v]));
+    }
+
+    //printf("shape[%ld].vertices: %ld\n", i, shapes[i].mesh.positions.size());
+    //assert((shapes[i].mesh.positions.size() % 3) == 0);
+    //for (size_t v = 0; v < shapes[i].mesh.positions.size() / 3; v++) {
+    //  printf("  v[%ld] = (%f, %f, %f)\n", v,
+    //    static_cast<const double>(shapes[i].mesh.positions[3*v+0]),
+    //    static_cast<const double>(shapes[i].mesh.positions[3*v+1]),
+    //    static_cast<const double>(shapes[i].mesh.positions[3*v+2]));
+    //}
+
+    printf("shape[%ld].num_tags: %ld\n", i, shapes[i].mesh.tags.size());
+    for (size_t t = 0; t < shapes[i].mesh.tags.size(); t++) {
+      printf("  tag[%ld] = %s ", t, shapes[i].mesh.tags[t].name.c_str());
+      printf(" ints: [");
+      for (size_t j = 0; j < shapes[i].mesh.tags[t].intValues.size(); ++j)
+      {
+          printf("%ld", static_cast<long>(shapes[i].mesh.tags[t].intValues[j]));
+          if (j < (shapes[i].mesh.tags[t].intValues.size()-1))
+          {
+              printf(", ");
+          }
+      }
+      printf("]");
+
+      printf(" floats: [");
+      for (size_t j = 0; j < shapes[i].mesh.tags[t].floatValues.size(); ++j)
+      {
+          printf("%f", static_cast<const double>(shapes[i].mesh.tags[t].floatValues[j]));
+          if (j < (shapes[i].mesh.tags[t].floatValues.size()-1))
+          {
+              printf(", ");
+          }
+      }
+      printf("]");
+
+      printf(" strings: [");
+      for (size_t j = 0; j < shapes[i].mesh.tags[t].stringValues.size(); ++j)
+      {
+          printf("%s", shapes[i].mesh.tags[t].stringValues[j].c_str());
+          if (j < (shapes[i].mesh.tags[t].stringValues.size()-1))
+          {
+              printf(", ");
+          }
+      }
+      printf("]");
+      printf("\n");
+    }
+  }
+
+  for (size_t i = 0; i < materials.size(); i++) {
+    printf("material[%ld].name = %s\n", i, materials[i].name.c_str());
+    printf("  material.Ka = (%f, %f ,%f)\n", static_cast<const double>(materials[i].ambient[0]),       static_cast<const double>(materials[i].ambient[1]),       static_cast<const double>(materials[i].ambient[2]));
+    printf("  material.Kd = (%f, %f ,%f)\n", static_cast<const double>(materials[i].diffuse[0]),       static_cast<const double>(materials[i].diffuse[1]),       static_cast<const double>(materials[i].diffuse[2]));
+    printf("  material.Ks = (%f, %f ,%f)\n", static_cast<const double>(materials[i].specular[0]),      static_cast<const double>(materials[i].specular[1]),      static_cast<const double>(materials[i].specular[2]));
+    printf("  material.Tr = (%f, %f ,%f)\n", static_cast<const double>(materials[i].transmittance[0]), static_cast<const double>(materials[i].transmittance[1]), static_cast<const double>(materials[i].transmittance[2]));
+    printf("  material.Ke = (%f, %f ,%f)\n", static_cast<const double>(materials[i].emission[0]),      static_cast<const double>(materials[i].emission[1]),      static_cast<const double>(materials[i].emission[2]));
+    printf("  material.Ns = %f\n", static_cast<const double>(materials[i].shininess));
+    printf("  material.Ni = %f\n", static_cast<const double>(materials[i].ior));
+    printf("  material.dissolve = %f\n", static_cast<const double>(materials[i].dissolve));
+    printf("  material.illum = %d\n",  materials[i].illum);
+    printf("  material.map_Ka = %s\n", materials[i].ambient_texname.c_str());
+    printf("  material.map_Kd = %s\n", materials[i].diffuse_texname.c_str());
+    printf("  material.map_Ks = %s\n", materials[i].specular_texname.c_str());
+    printf("  material.map_Ns = %s\n", materials[i].specular_highlight_texname.c_str());
+    printf("  material.map_bump = %s\n", materials[i].bump_texname.c_str());
+    printf("  material.map_d = %s\n", materials[i].alpha_texname.c_str());
+    printf("  material.disp = %s\n", materials[i].displacement_texname.c_str());
+    printf("  material.refl = %s\n", materials[i].reflection_texname.c_str());
+    std::map<std::string, std::string>::const_iterator it(materials[i].unknown_parameter.begin());
+    std::map<std::string, std::string>::const_iterator itEnd(materials[i].unknown_parameter.end());
+
+    for (; it != itEnd; it++) {
+      printf("  material.%s = %s\n", it->first.c_str(), it->second.c_str());
+    }
+    printf("\n");
+  }
+}
+
+static bool
+TestLoadObj(
+  const char* filename,
+  const char* basepath = NULL,
+  bool triangulate = true)
+{
+  std::cout << "Loading " << filename << std::endl;
+
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename, basepath, triangulate);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  if (!ret) {
+    printf("Failed to load/parse .obj.\n");
+    return false;
+  }
+
+  PrintInfo(attrib, shapes, materials, triangulate);
+
+  return true;
+}
+
+static bool
+TestLoadObjFromPreopenedFile(
+  const char* filename,
+  const char* basepath = NULL,
+  bool readMaterials = true,
+  bool triangulate = true)
+{
+  std::string fullFilename = std::string(basepath) + filename;
+  std::cout << "Loading " << fullFilename << std::endl;
+
+  std::ifstream fileStream(fullFilename.c_str());
+
+  if (!fileStream) {
+    std::cerr << "Could not find specified file: " << fullFilename << std::endl;
+    return false;
+  }
+
+  tinyobj::MaterialStreamReader materialStreamReader(fileStream);
+  tinyobj::MaterialStreamReader* materialReader = readMaterials
+    ? &materialStreamReader
+    : NULL;
+
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, &fileStream, materialReader);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  if (!ret) {
+    printf("Failed to load/parse .obj.\n");
+    return false;
+  }
+
+  std::cout << "Loaded material count: " << materials.size() << "\n";
+
+  return true;
+}
+
+static bool
+TestStreamLoadObj()
+{
+  std::cout << "Stream Loading " << std::endl;
+
+  std::stringstream objStream;
+  objStream
+    << "mtllib cube.mtl\n"
+    "\n"
+    "v 0.000000 2.000000 2.000000\n"
+    "v 0.000000 0.000000 2.000000\n"
+    "v 2.000000 0.000000 2.000000\n"
+    "v 2.000000 2.000000 2.000000\n"
+    "v 0.000000 2.000000 0.000000\n"
+    "v 0.000000 0.000000 0.000000\n"
+    "v 2.000000 0.000000 0.000000\n"
+    "v 2.000000 2.000000 0.000000\n"
+    "# 8 vertices\n"
+    "\n"
+    "g front cube\n"
+    "usemtl white\n"
+    "f 1 2 3 4\n"
+    "g back cube\n"
+    "# expects white material\n"
+    "f 8 7 6 5\n"
+    "g right cube\n"
+    "usemtl red\n"
+    "f 4 3 7 8\n"
+    "g top cube\n"
+    "usemtl white\n"
+    "f 5 1 4 8\n"
+    "g left cube\n"
+    "usemtl green\n"
+    "f 5 6 2 1\n"
+    "g bottom cube\n"
+    "usemtl white\n"
+    "f 2 6 7 3\n"
+    "# 6 elements";
+
+std::string matStream(
+    "newmtl white\n"
+    "Ka 0 0 0\n"
+    "Kd 1 1 1\n"
+    "Ks 0 0 0\n"
+    "\n"
+    "newmtl red\n"
+    "Ka 0 0 0\n"
+    "Kd 1 0 0\n"
+    "Ks 0 0 0\n"
+    "\n"
+    "newmtl green\n"
+    "Ka 0 0 0\n"
+    "Kd 0 1 0\n"
+    "Ks 0 0 0\n"
+    "\n"
+    "newmtl blue\n"
+    "Ka 0 0 0\n"
+    "Kd 0 0 1\n"
+    "Ks 0 0 0\n"
+    "\n"
+    "newmtl light\n"
+    "Ka 20 20 20\n"
+    "Kd 1 1 1\n"
+    "Ks 0 0 0");
+
+    using namespace tinyobj;
+    class MaterialStringStreamReader:
+        public MaterialReader
+    {
+        public:
+            MaterialStringStreamReader(const std::string& matSStream): m_matSStream(matSStream) {}
+            virtual ~MaterialStringStreamReader() {}
+            virtual bool operator() (
+              const std::string& matId,
+              std::vector<material_t>* materials,
+              //std::map<std::string, int>* matMap,
+              std::map<uint32_t, int>* matMap,
+              std::string* err)
+            {
+                (void)matId;
+                (void)err;
+                std::string warning;
+                LoadMtl(matMap, materials, &m_matSStream, &warning);
+                return true;
+            }
+
+        private:
+            std::stringstream m_matSStream;
+    };
+
+  MaterialStringStreamReader matSSReader(matStream);
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, &objStream, &matSSReader);    
+  
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  if (!ret) {
+    return false;
+  }
+
+  PrintInfo(attrib, shapes, materials);
+    
+  return true;
+}
+
+const char* gMtlBasePath = "../models/";
+
+TEST_CASE("cornell_box", "[Loader]") {
+
+    REQUIRE(true == TestLoadObj("../models/cornell_box.obj", gMtlBasePath));
+}
+
+TEST_CASE("catmark_torus_creases0", "[Loader]") {
+
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/catmark_torus_creases0.obj", gMtlBasePath, /*triangulate*/false);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  REQUIRE(true == ret);
+
+  REQUIRE(1 == shapes.size());
+  REQUIRE(8 == shapes[0].mesh.tags.size());
+}
+
+TEST_CASE("pbr", "[Loader]") {
+
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/pbr-mat-ext.obj", gMtlBasePath, /*triangulate*/false);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+  REQUIRE(true == ret);
+  REQUIRE(1 == materials.size());
+  REQUIRE(0.2 == Approx(materials[0].roughness));
+  REQUIRE(0.3 == Approx(materials[0].metallic));
+  REQUIRE(0.4 == Approx(materials[0].sheen));
+  REQUIRE(0.5 == Approx(materials[0].clearcoat_thickness));
+  REQUIRE(0.6 == Approx(materials[0].clearcoat_roughness));
+  REQUIRE(0.7 == Approx(materials[0].anisotropy));
+  REQUIRE(0.8 == Approx(materials[0].anisotropy_rotation));
+  REQUIRE(0 == materials[0].roughness_texname.compare("roughness.tex"));
+  REQUIRE(0 == materials[0].metallic_texname.compare("metallic.tex"));
+  REQUIRE(0 == materials[0].sheen_texname.compare("sheen.tex"));
+  REQUIRE(0 == materials[0].emissive_texname.compare("emissive.tex"));
+  REQUIRE(0 == materials[0].normal_texname.compare("normalmap.tex"));
+}
+
+TEST_CASE("stream_load", "[Stream]") {
+    REQUIRE(true == TestStreamLoadObj());
+}
+
+TEST_CASE("stream_load_from_file_skipping_materials", "[Stream]") {
+  REQUIRE(true == TestLoadObjFromPreopenedFile(
+    "../models/pbr-mat-ext.obj", gMtlBasePath, /*readMaterials*/false, /*triangulate*/false));
+}
+
+TEST_CASE("stream_load_from_file_with_materials", "[Stream]") {
+  REQUIRE(true == TestLoadObjFromPreopenedFile(
+    "../models/pbr-mat-ext.obj", gMtlBasePath, /*readMaterials*/true, /*triangulate*/false));
+}
+
+TEST_CASE("trailing_whitespace_in_mtl", "[Issue92]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-92.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+  REQUIRE(true == ret);
+  REQUIRE(1 == materials.size());
+  REQUIRE(0 == materials[0].diffuse_texname.compare("tmp.png"));
+}
+
+TEST_CASE("transmittance_filter", "[Issue95]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-95.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+  REQUIRE(true == ret);
+  REQUIRE(1 == materials.size());
+  REQUIRE(0.1 == Approx(materials[0].transmittance[0]));
+  REQUIRE(0.2 == Approx(materials[0].transmittance[1]));
+  REQUIRE(0.3 == Approx(materials[0].transmittance[2]));
+}
+
+TEST_CASE("transmittance_filter_Tf", "[Issue95-Tf]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-95-2.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+  REQUIRE(true == ret);
+  REQUIRE(1 == materials.size());
+  REQUIRE(0.1 == Approx(materials[0].transmittance[0]));
+  REQUIRE(0.2 == Approx(materials[0].transmittance[1]));
+  REQUIRE(0.3 == Approx(materials[0].transmittance[2]));
+}
+
+TEST_CASE("transmittance_filter_Kt", "[Issue95-Kt]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-95.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+  REQUIRE(true == ret);
+  REQUIRE(1 == materials.size());
+  REQUIRE(0.1 == Approx(materials[0].transmittance[0]));
+  REQUIRE(0.2 == Approx(materials[0].transmittance[1]));
+  REQUIRE(0.3 == Approx(materials[0].transmittance[2]));
+}
+
+TEST_CASE("usemtl_at_last_line", "[Issue104]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/usemtl-issue-104.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+  REQUIRE(true == ret);
+  REQUIRE(1 == shapes.size());
+}
+
+TEST_CASE("texture_opts", "[Issue85]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/texture-options-issue-85.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+  REQUIRE(true == ret);
+  REQUIRE(1 == shapes.size());
+  REQUIRE(3 == materials.size());
+  REQUIRE(0 == materials[0].name.compare("default"));
+  REQUIRE(0 == materials[1].name.compare("bm2"));
+  REQUIRE(0 == materials[2].name.compare("bm3"));
+  REQUIRE(true == materials[0].ambient_texopt.clamp);
+  REQUIRE(0.1 == Approx(materials[0].diffuse_texopt.origin_offset[0]));
+  REQUIRE(0.0 == Approx(materials[0].diffuse_texopt.origin_offset[1]));
+  REQUIRE(0.0 == Approx(materials[0].diffuse_texopt.origin_offset[2]));
+  REQUIRE(0.1 == Approx(materials[0].specular_texopt.scale[0]));
+  REQUIRE(0.2 == Approx(materials[0].specular_texopt.scale[1]));
+  REQUIRE(1.0 == Approx(materials[0].specular_texopt.scale[2]));
+  REQUIRE(0.1 == Approx(materials[0].specular_highlight_texopt.turbulence[0]));
+  REQUIRE(0.2 == Approx(materials[0].specular_highlight_texopt.turbulence[1]));
+  REQUIRE(0.3 == Approx(materials[0].specular_highlight_texopt.turbulence[2]));
+  REQUIRE(3.0 == Approx(materials[0].bump_texopt.bump_multiplier));
+
+  REQUIRE(0.1 == Approx(materials[1].specular_highlight_texopt.brightness));
+  REQUIRE(0.3 == Approx(materials[1].specular_highlight_texopt.contrast));
+  REQUIRE('r' == materials[1].bump_texopt.imfchan);
+
+  REQUIRE(tinyobj::TEXTURE_TYPE_SPHERE == materials[2].diffuse_texopt.type);
+  REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_TOP == materials[2].specular_texopt.type);
+  REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_BOTTOM == materials[2].specular_highlight_texopt.type);
+  REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_LEFT == materials[2].ambient_texopt.type);
+  REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_RIGHT == materials[2].alpha_texopt.type);
+  REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_FRONT == materials[2].bump_texopt.type);
+  REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_BACK == materials[2].displacement_texopt.type);
+}
+
+TEST_CASE("mtllib_multiple_filenames", "[Issue112]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/mtllib-multiple-files-issue-112.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+  REQUIRE(true == ret);
+  REQUIRE(1 == materials.size());
+}
+
+TEST_CASE("tr_and_d", "[Issue43]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/tr-and-d-issue-43.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+  REQUIRE(true == ret);
+  REQUIRE(2 == materials.size());
+
+  REQUIRE(0.75 == Approx(materials[0].dissolve));
+  REQUIRE(0.75 == Approx(materials[1].dissolve));
+}
+
+TEST_CASE("refl", "[refl]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/refl.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  PrintInfo(attrib, shapes, materials);
+
+  REQUIRE(true == ret);
+  REQUIRE(5 == materials.size());
+
+  REQUIRE(materials[0].reflection_texname.compare("reflection.tga") == 0);
+}
+
+TEST_CASE("map_Bump", "[bump]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/map-bump.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  PrintInfo(attrib, shapes, materials);
+
+  REQUIRE(true == ret);
+  REQUIRE(2 == materials.size());
+
+  REQUIRE(materials[0].bump_texname.compare("bump.jpg") == 0);
+}
+
+TEST_CASE("g_ignored", "[Issue138]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-138.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  PrintInfo(attrib, shapes, materials);
+
+  REQUIRE(true == ret);
+  REQUIRE(2 == shapes.size());
+  REQUIRE(2 == materials.size());
+
+}
+
+TEST_CASE("vertex-col-ext", "[Issue144]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/cube-vertexcol.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  //PrintInfo(attrib, shapes, materials);
+
+  REQUIRE(true == ret);
+  REQUIRE((8 * 3) == attrib.colors.size());
+
+  REQUIRE(0 == Approx(attrib.colors[3 * 0 + 0]));
+  REQUIRE(0 == Approx(attrib.colors[3 * 0 + 1]));
+  REQUIRE(0 == Approx(attrib.colors[3 * 0 + 2]));
+
+  REQUIRE(0 == Approx(attrib.colors[3 * 1 + 0]));
+  REQUIRE(0 == Approx(attrib.colors[3 * 1 + 1]));
+  REQUIRE(1 == Approx(attrib.colors[3 * 1 + 2]));
+
+  REQUIRE(1 == Approx(attrib.colors[3 * 4 + 0]));
+
+  REQUIRE(1 == Approx(attrib.colors[3 * 7 + 0]));
+  REQUIRE(1 == Approx(attrib.colors[3 * 7 + 1]));
+  REQUIRE(1 == Approx(attrib.colors[3 * 7 + 2]));
+}
+
+TEST_CASE("norm_texopts", "[norm]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/norm-texopt.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  REQUIRE(true == ret);
+  REQUIRE(1 == shapes.size());
+  REQUIRE(1 == materials.size());
+  REQUIRE(3.0 == Approx(materials[0].normal_texopt.bump_multiplier));
+
+}
+
+TEST_CASE("zero-face-idx-value", "[Issue140]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-140-zero-face-idx.obj", gMtlBasePath);
+
+  
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+  REQUIRE(false == ret);
+  REQUIRE(!err.empty());
+
+}
+
+TEST_CASE("texture-name-whitespace", "[Issue145]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/texture-filename-with-whitespace.obj", gMtlBasePath);
+
+  
+  if (!err.empty()) {
+    std::cerr << "[Issue145] " << err << std::endl;
+  }
+
+  REQUIRE(true == ret);
+  REQUIRE(err.empty());
+  REQUIRE(2 < materials.size());
+
+  REQUIRE(0 == materials[0].diffuse_texname.compare("texture 01.png"));
+  REQUIRE(0 == materials[1].bump_texname.compare("bump 01.png"));
+  REQUIRE(2 == Approx(materials[1].bump_texopt.bump_multiplier));
+
+}
+
+#if 0
+int
+main(
+  int argc,
+  char **argv)
+{
+  if (argc > 1) {
+    const char* basepath = NULL;
+    if (argc > 2) {
+      basepath = argv[2];
+    }
+    assert(true == TestLoadObj(argv[1], basepath));
+  } else {
+    //assert(true == TestLoadObj("cornell_box.obj"));
+    //assert(true == TestLoadObj("cube.obj"));
+    assert(true == TestStreamLoadObj());
+    assert(true == TestLoadObj("catmark_torus_creases0.obj", NULL, false));
+  }
+
+  return 0;
+}
+#endif

tests/vcbuild.bat

@@ -0,0 +1,4 @@
+chcp 437
+python kuroga.py config-msvc.py
+call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" x86_amd64
+ninja

tinyobjloader-config.cmake.in

@@ -0,0 +1,9 @@
+@PACKAGE_INIT@
+
+set(TINYOBJLOADER_VERSION "@TINYOBJLOADER_VERSION@")
+
+set_and_check(TINYOBJLOADER_INCLUDE_DIRS "@PACKAGE_TINYOBJLOADER_INCLUDE_DIR@")
+set_and_check(TINYOBJLOADER_LIBRARY_DIRS "@PACKAGE_TINYOBJLOADER_LIBRARY_DIR@")
+set(TINYOBJLOADER_LIBRARIES @LIBRARY_NAME@)
+
+include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@-targets.cmake")

tinyobjloader.pc.in

@@ -0,0 +1,15 @@
+# Generated by CMake @CMAKE_VERSION@ for @PROJECT_NAME@. Any changes to this
+# file will be overwritten by the next CMake run. The input file was
+# tinyobjloader.pc.in.
+
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+libdir=${prefix}/@TINYOBJLOADER_LIBRARY_DIR@
+includedir=${prefix}/@TINYOBJLOADER_INCLUDE_DIR@
+
+Name: @PROJECT_NAME@
+Description: Tiny but powerful single file wavefront obj loader
+URL: https://syoyo.github.io/tinyobjloader/
+Version: @TINYOBJLOADER_VERSION@
+Libs: -L${libdir} -l@LIBRARY_NAME@
+Cflags: -I${includedir}

wercker.yml

@@ -6,7 +6,5 @@ build:
             name: build
             code: |
                   git clone https://github.com/syoyo/orebuildenv.git
-                  chmod +x ./orebuildenv/build/linux/bin/premake4
-                  ./orebuildenv/build/linux/bin/premake4 gmake
-                  make
-                  ./test_tinyobjloader
+                  cd tests
+                  make check