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Add gl view for testing.

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This commit is contained in:
Syoyo Fujita
2016-05-15 17:46:59 +09:00
parent 566d259df2
commit 88fe2421d9
5 changed files with 992 additions and 34 deletions
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124
experimental/optimized-parse.cc
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@@ -294,6 +294,7 @@ static inline int fixIndex(int idx, int n) {
return n + idx; // negative value = relative
}
#if 0
// Parse triples with index offsets: i, i/j/k, i//k, i/j
static vertex_index parseTriple(const char **token, int vsize, int vnsize,
int vtsize) {
@@ -340,6 +341,7 @@ static vertex_index parseTriple(const char **token, int vsize, int vnsize,
}
return vi;
}
#endif
// Parse raw triples: i, i/j/k, i//k, i/j
static vertex_index parseRawTriple(const char **token) {
@@ -600,7 +602,21 @@ typedef struct
CommandType type;
} Command;
bool parseLine(Command *command, const char *p, size_t p_len)
struct CommandCount
{
size_t num_v;
size_t num_vn;
size_t num_vt;
size_t num_f;
CommandCount() {
num_v = 0;
num_vn = 0;
num_vt = 0;
num_f = 0;
}
};
static bool parseLine(Command *command, const char *p, size_t p_len)
{
char linebuf[4096];
assert(p_len < 4095);
@@ -667,7 +683,6 @@ bool parseLine(Command *command, const char *p, size_t p_len)
//token += strspn(token, " \t");
skip_space(&token);
int num_verts = 0;
while (!IS_NEW_LINE(token[0])) {
vertex_index vi = parseRawTriple(&token);
//printf("v = %d, %d, %d\n", vi.v_idx, vi.vn_idx, vi.vt_idx);
@@ -747,7 +762,8 @@ bool parseLine(Command *command, const char *p, size_t p_len)
// group name
if (token[0] == 'g' && IS_SPACE((token[1]))) {
ShortString names[16];
std::vector<ShortString> names;
int num_names = 0;
while (!IS_NEW_LINE(token[0])) {
@@ -759,10 +775,10 @@ bool parseLine(Command *command, const char *p, size_t p_len)
assert(num_names > 0);
int name_idx = 0;
//int name_idx = 0;
// names[0] must be 'g', so skip the 0th element.
if (num_names > 1) {
name_idx = 1;
//name_idx = 1;
}
//command->group_name->assign(names[name_idx]);
@@ -820,13 +836,25 @@ typedef struct
// Idea come from https://github.com/antonmks/nvParse
// 1. mmap file
// 2. find newline(\n) and list of line data.
// 2. find newline(\n, \r\n, \r) and list of line data.
// 3. Do parallel parsing for each line.
// 4. Reconstruct final mesh data structure.
#define kMaxThreads (32)
void parse(const char* buf, size_t len, int req_num_threads)
static inline bool is_line_ending(const char* p, size_t i, size_t end_i)
{
if (p[i] == '\0') return true;
if (p[i] == '\n') return true; // this includes \r\n
if (p[i] == '\r') {
if (((i+1) < end_i) && (p[i+1] != '\n')) { // detect only \r case
return true;
}
}
return false;
}
void parse(std::vector<float> &vertices, std::vector<float> &normals, std::vector<float> &texcoords, std::vector<vertex_index> &faces, const char* buf, size_t len, int req_num_threads)
{
std::vector<char> newline_marker(len, 0);
@@ -840,7 +868,7 @@ void parse(const char* buf, size_t len, int req_num_threads)
std::atomic<size_t> newline_counter(0);
std::vector<LineInfo> line_infos[kMaxThreads];
for (auto t = 0; t < num_threads; t++) {
for (size_t t = 0; t < static_cast<size_t>(num_threads); t++) {
// Pre allocate enough memory. len / 1024 / num_threads is just a heuristic value.
line_infos[t].reserve(len / 1024 / num_threads);
}
@@ -852,18 +880,18 @@ void parse(const char* buf, size_t len, int req_num_threads)
auto start_time = std::chrono::high_resolution_clock::now();
auto chunk_size = len / num_threads;
for (auto t = 0; t < num_threads; t++) {
for (size_t t = 0; t < static_cast<size_t>(num_threads); t++) {
workers.push_back(std::thread([&, t]() {
auto start_idx = (t + 0) * chunk_size;
auto end_idx = std::min((t + 1) * chunk_size, len - 1);
if (t == (num_threads - 1)) {
if (t == static_cast<size_t>((num_threads - 1))) {
end_idx = len - 1;
}
size_t prev_pos = start_idx;
for (size_t i = start_idx; i < end_idx; i++) {
if (buf[i] == '\n') {
if ((t > 0) && (prev_pos == start_idx) && (buf[start_idx-1] != '\n')) {
if (is_line_ending(buf, i, end_idx)) {
if ((t > 0) && (prev_pos == start_idx) && (!is_line_ending(buf, start_idx-1, end_idx))) {
// first linebreak found in (chunk > 0), and a line before this linebreak belongs to previous chunk, so skip it.
prev_pos = i + 1;
continue;
@@ -885,7 +913,7 @@ void parse(const char* buf, size_t len, int req_num_threads)
if ((t < num_threads) && (buf[end_idx-1] != '\n')) {
auto extra_span_idx = std::min(end_idx-1+chunk_size, len - 1);
for (size_t i = end_idx; i < extra_span_idx; i++) {
if (buf[i] == '\n') {
if (is_line_ending(buf, i, extra_span_idx)) {
LineInfo info;
info.pos = prev_pos;
info.len = i - prev_pos;
@@ -912,7 +940,7 @@ void parse(const char* buf, size_t len, int req_num_threads)
}
auto line_sum = 0;
for (auto t = 0; t < num_threads; t++) {
for (size_t t = 0; t < num_threads; t++) {
std::cout << t << ": # of lines = " << line_infos[t].size() << std::endl;
line_sum += line_infos[t].size();
}
@@ -929,19 +957,30 @@ void parse(const char* buf, size_t len, int req_num_threads)
std::cout << ms1.count() << " ms\n";
CommandCount command_count[kMaxThreads];
// 2. parse each line in parallel.
{
std::vector<std::thread> workers;
auto t_start = std::chrono::high_resolution_clock::now();
for (auto t = 0; t < num_threads; t++) {
for (size_t t = 0; t < num_threads; t++) {
workers.push_back(std::thread([&, t]() {
for (auto i = 0; i < line_infos[t].size(); i++) {
for (size_t i = 0; i < line_infos[t].size(); i++) {
Command command;
bool ret = parseLine(&command, &buf[line_infos[t][i].pos], line_infos[t][i].len);
if (ret) {
commands[t].push_back(command);
if (command.type == COMMAND_V) {
command_count[t].num_v++;
} else if (command.type == COMMAND_VN) {
command_count[t].num_vn++;
} else if (command.type == COMMAND_VT) {
command_count[t].num_vt++;
} else if (command.type == COMMAND_F) {
command_count[t].num_f++;
}
commands[t].emplace_back(std::move(command));
}
}
@@ -959,16 +998,31 @@ void parse(const char* buf, size_t len, int req_num_threads)
}
auto command_sum = 0;
for (auto t = 0; t < num_threads; t++) {
for (size_t t = 0; t < num_threads; t++) {
//std::cout << t << ": # of commands = " << commands[t].size() << std::endl;
command_sum += commands[t].size();
}
//std::cout << "# of commands = " << command_sum << std::endl;
std::vector<float> vertices;
std::vector<float> normals;
std::vector<float> texcoords;
std::vector<vertex_index> faces;
size_t num_v = 0;
size_t num_vn = 0;
size_t num_vt = 0;
size_t num_f = 0;
for (size_t t = 0; t < num_threads; t++) {
num_v += command_count[t].num_v;
num_vn += command_count[t].num_vn;
num_vt += command_count[t].num_vt;
num_f += command_count[t].num_f;
}
std::cout << "# v " << num_v << std::endl;
std::cout << "# vn " << num_vn << std::endl;
std::cout << "# vt " << num_vt << std::endl;
std::cout << "# f " << num_f << std::endl;
vertices.reserve(num_v * 3);
normals.reserve(num_vn * 3);
texcoords.reserve(num_vt * 2);
faces.reserve(num_f);
// merge
{
@@ -979,25 +1033,25 @@ void parse(const char* buf, size_t len, int req_num_threads)
if (commands[t][i].type == COMMAND_EMPTY) {
continue;
} else if (commands[t][i].type == COMMAND_V) {
vertices.push_back(commands[t][i].vx);
vertices.push_back(commands[t][i].vy);
vertices.push_back(commands[t][i].vz);
vertices.emplace_back(commands[t][i].vx);
vertices.emplace_back(commands[t][i].vy);
vertices.emplace_back(commands[t][i].vz);
} else if (commands[t][i].type == COMMAND_VN) {
normals.push_back(commands[t][i].nx);
normals.push_back(commands[t][i].ny);
normals.push_back(commands[t][i].nz);
normals.emplace_back(commands[t][i].nx);
normals.emplace_back(commands[t][i].ny);
normals.emplace_back(commands[t][i].nz);
} else if (commands[t][i].type == COMMAND_VT) {
texcoords.push_back(commands[t][i].tx);
texcoords.push_back(commands[t][i].ty);
texcoords.emplace_back(commands[t][i].tx);
texcoords.emplace_back(commands[t][i].ty);
} else if (commands[t][i].type == COMMAND_F) {
int v_size = vertices.size() / 3;
int vn_size = normals.size() / 3;
int vt_size = texcoords.size() / 2;
for (size_t k = 0; k < commands[t][i].f.size(); k++) {
int v_idx = fixIndex(commands[t][i].f[k].v_idx, v_size);
int vn_idx = fixIndex(commands[t][i].f[k].vn_idx, v_size);
int vt_idx = fixIndex(commands[t][i].f[k].vt_idx, v_size);
faces.push_back(vertex_index(v_idx, vn_idx, vt_idx));
int vn_idx = fixIndex(commands[t][i].f[k].vn_idx, vn_size);
int vt_idx = fixIndex(commands[t][i].f[k].vt_idx, vt_size);
faces.emplace_back(std::move(vertex_index(v_idx, vn_idx, vt_idx)));
}
}
}
@@ -1020,6 +1074,7 @@ void parse(const char* buf, size_t len, int req_num_threads)
}
#ifdef CONSOLE_TEST
int
main(int argc, char **argv)
{
@@ -1035,7 +1090,7 @@ main(int argc, char **argv)
}
#ifdef _WIN64
HANDLE file = CreateFileA("lineitem.tbl", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
HANDLE file = CreateFileA(argv[1], 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);
@@ -1090,3 +1145,4 @@ main(int argc, char **argv)
return EXIT_SUCCESS;
}
#endif

48
experimental/premake4.lua Normal file
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@@ -0,0 +1,48 @@
solution "objview"
-- location ( "build" )
configurations { "Debug", "Release" }
platforms {"native", "x64", "x32"}
project "objview"
kind "ConsoleApp"
language "C++"
files { "viewer.cc", "trackball.cc" }
includedirs { "./" }
includedirs { "../../" }
buildoptions { "-std=c++11" }
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-3.1.2.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"}

292
experimental/trackball.cc Normal file
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@@ -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;
}

75
experimental/trackball.h Normal file
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@@ -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]);

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experimental/viewer.cc Normal file
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//
// Simple .obj viewer(vertex only)
//
#include <vector>
#include <string>
#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <limits>
#include <cmath>
#include <cassert>
#include <algorithm>
#include <GL/glew.h>
#ifdef __APPLE__
#include <OpenGL/glu.h>
#else
#include <GL/glu.h>
#endif
#include <GLFW/glfw3.h>
#include "trackball.h"
#include "optimized-parse.cc"
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)
{
#ifdef _WIN64
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);
#else
FILE* f = fopen(filename, "r" );
fseek(f, 0, SEEK_END);
long fileSize = ftell(f);
fclose(f);
struct stat sb;
char *p;
int fd;
fd = open (filename, O_RDONLY);
if (fd == -1) {
perror ("open");
return NULL;
}
if (fstat (fd, &sb) == -1) {
perror ("fstat");
return NULL;
}
if (!S_ISREG (sb.st_mode)) {
fprintf (stderr, "%s is not a file\n", "lineitem.tbl");
return NULL;
}
p = (char*)mmap (0, fileSize, PROT_READ, MAP_SHARED, fd, 0);
if (p == MAP_FAILED) {
perror ("mmap");
return NULL;
}
if (close (fd) == -1) {
perror ("close");
return NULL;
}
return p;
(*len) = fileSize;
#endif
}
bool LoadObjAndConvert(float bmin[3], float bmax[3], const char* filename)
{
std::vector<float> vertices;
std::vector<float> normals;
std::vector<float> texcoords;
std::vector<vertex_index> faces;
size_t data_len = 0;
const char* data = nullptr;
data = mmap_file(&data_len, filename);
if (data == nullptr) {
exit(-1);
return false;
}
parse(vertices, normals, texcoords, faces, data, data_len, 1);
bmin[0] = bmin[1] = bmin[2] = std::numeric_limits<float>::max();
bmax[0] = bmax[1] = bmax[2] = -std::numeric_limits<float>::max();
{
DrawObject o;
std::vector<float> vb; // pos(3float), normal(3float), color(3float)
for (size_t f = 0; f < faces.size()/3; f++) {
vertex_index idx0 = faces[3*f+0];
vertex_index idx1 = faces[3*f+1];
vertex_index idx2 = faces[3*f+2];
float v[3][3];
for (int k = 0; k < 3; k++) {
int f0 = idx0.v_idx;
int f1 = idx1.v_idx;
int f2 = idx2.v_idx;
assert(f0 >= 0);
assert(f1 >= 0);
assert(f2 >= 0);
v[0][k] = vertices[3*f0+k];
v[1][k] = vertices[3*f1+k];
v[2][k] = 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 (normals.size() > 0) {
int f0 = idx0.vn_idx;
int f1 = idx1.vn_idx;
int f2 = idx2.vn_idx;
assert(f0 >= 0);
assert(f1 >= 0);
assert(f2 >= 0);
for (int k = 0; k < 3; k++) {
n[0][k] = normals[3*f0+k];
n[1][k] = normals[3*f1+k];
n[2][k] = 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++) {
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 > 0.0f) {
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);
}
}
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;
printf("reshape\n");
glViewport(0, 0, w, 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 << "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];
if (false == LoadObjAndConvert(bmin, bmax, 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);
// 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();
}