156 lines
4.3 KiB
C++
156 lines
4.3 KiB
C++
#define TINYOBJLOADER_IMPLEMENTATION
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#include "tiny_obj_loader.h"
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#include <cstdio>
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#include <cstdlib>
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#include <cassert>
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#include <iostream>
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#include <sstream>
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#include <fstream>
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typedef struct
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{
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std::vector<float> vertices;
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std::vector<float> normals;
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std::vector<float> texcoords;
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std::vector<int> v_indices;
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std::vector<int> vn_indices;
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std::vector<int> vt_indices;
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std::vector<tinyobj::material_t> materials;
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} MyMesh;
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void vertex_cb(void *user_data, float x, float y, float z)
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{
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MyMesh *mesh = reinterpret_cast<MyMesh*>(user_data);
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printf("v[%ld] = %f, %f, %f\n", mesh->vertices.size() / 3, x, y, z);
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mesh->vertices.push_back(x);
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mesh->vertices.push_back(y);
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mesh->vertices.push_back(z);
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}
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void normal_cb(void *user_data, float x, float y, float z)
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{
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MyMesh *mesh = reinterpret_cast<MyMesh*>(user_data);
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printf("vn[%ld] = %f, %f, %f\n", mesh->normals.size() / 3, x, y, z);
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mesh->normals.push_back(x);
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mesh->normals.push_back(y);
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mesh->normals.push_back(z);
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}
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void texcoord_cb(void *user_data, float x, float y)
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{
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MyMesh *mesh = reinterpret_cast<MyMesh*>(user_data);
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printf("vt[%ld] = %f, %f\n", mesh->texcoords.size() / 2, x, y);
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mesh->texcoords.push_back(x);
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mesh->texcoords.push_back(y);
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}
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void index_cb(void *user_data, int v_idx, int vn_idx, int vt_idx)
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{
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// NOTE: the value of each index is raw value.
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// For example, the application must manually adjust the index with offset
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// (e.g. v_indices.size()) when the value is negative(relative index).
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// See fixIndex() function in tiny_obj_loader.h for details.
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// Also, -2147483648(0x80000000) is set for the index value which does not exist in .obj
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MyMesh *mesh = reinterpret_cast<MyMesh*>(user_data);
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printf("idx[%ld] = %d, %d, %d\n", mesh->v_indices.size(), v_idx, vn_idx, vt_idx);
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if (v_idx != 0x80000000) {
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mesh->v_indices.push_back(v_idx);
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}
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if (vn_idx != 0x80000000) {
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mesh->vn_indices.push_back(vn_idx);
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}
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if (vt_idx != 0x80000000) {
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mesh->vt_indices.push_back(vt_idx);
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}
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}
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void usemtl_cb(void *user_data, const char* name, int material_idx)
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{
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MyMesh *mesh = reinterpret_cast<MyMesh*>(user_data);
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if ((material_idx > -1) && (material_idx < mesh->materials.size())) {
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printf("usemtl. material id = %d(name = %s)\n", material_idx, mesh->materials[material_idx].name.c_str());
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} else {
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printf("usemtl. name = %s\n", name);
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}
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}
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void mtllib_cb(void *user_data, const tinyobj::material_t *materials, int num_materials)
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{
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MyMesh *mesh = reinterpret_cast<MyMesh*>(user_data);
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printf("mtllib. # of materials = %d\n", num_materials);
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for (int i = 0; i < num_materials; i++) {
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mesh->materials.push_back(materials[i]);
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}
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}
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void group_cb(void *user_data, const char **names, int num_names)
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{
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//MyMesh *mesh = reinterpret_cast<MyMesh*>(user_data);
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printf("group : name = \n");
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for (int i = 0; i < num_names; i++) {
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printf(" %s\n", names[i]);
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}
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}
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void object_cb(void *user_data, const char *name)
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{
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//MyMesh *mesh = reinterpret_cast<MyMesh*>(user_data);
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printf("object : name = %s\n", name);
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}
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int
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main(int argc, char** argv)
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{
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tinyobj::callback_t cb;
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cb.vertex_cb = vertex_cb;
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cb.normal_cb = normal_cb;
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cb.texcoord_cb = texcoord_cb;
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cb.index_cb = index_cb;
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cb.usemtl_cb = usemtl_cb;
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cb.mtllib_cb = mtllib_cb;
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cb.group_cb = group_cb;
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cb.object_cb = object_cb;
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MyMesh mesh;
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std::string err;
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std::ifstream ifs("../../models/cornell_box.obj");
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if (ifs.fail()) {
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std::cerr << "file not found." << std::endl;
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return EXIT_FAILURE;
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}
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tinyobj::MaterialFileReader mtlReader("../../models/");
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bool ret = tinyobj::LoadObjWithCallback(&mesh, cb, &err, &ifs, &mtlReader);
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if (!err.empty()) {
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std::cerr << err << std::endl;
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}
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if (!ret) {
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std::cerr << "Failed to parse .obj" << std::endl;
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return EXIT_FAILURE;
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}
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printf("# of vertices = %ld\n", mesh.vertices.size() / 3);
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printf("# of normals = %ld\n", mesh.normals.size() / 3);
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printf("# of texcoords = %ld\n", mesh.texcoords.size() / 2);
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printf("# of vertex indices = %ld\n", mesh.v_indices.size());
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printf("# of normal indices = %ld\n", mesh.vn_indices.size());
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printf("# of texcoord indices = %ld\n", mesh.vt_indices.size());
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printf("# of materials = %ld\n", mesh.materials.size());
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return EXIT_SUCCESS;
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}
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