在OPENGL环境下导入OBJ文件

#include "OBJLoader.h" static char* stralloc(const char *string) { char *copy; copy = (char*) malloc(strlen(string) + 1); if (copy == NULL) return NULL; strcpy(copy, string); return copy; } static char* DirName(char* path) { char* dir; char* s; dir = stralloc(path); s = strrchr(dir, '\\'); if (s) s[1] = '\0'; else dir[0] = '\0'; return dir; } COBJLoader::COBJLoader() { } COBJLoader::~COBJLoader() { GLuint i; GLMOBJgroup* group; if (model->pathname) free(model->pathname); if (model->mtllibname) free(model->mtllibname); if (model->vertices) free(model->vertices); if (model->normals) free(model->normals); if (model->texcoords) free(model->texcoords); if (model->facetnorms) free(model->facetnorms); if (model->triangles) free(model->triangles); if (model->materials) { for (i = 0; i < model->nummaterials; i++) free(model->materials[i].name); } free(model->materials); while(model->groups) { group = model->groups; model->groups = model->groups->next; free(group->name); free(group->triangles); free(group); } //free(model); } void COBJLoader::Init(char* filename) { model = (GLMOBJmodel*)malloc(sizeof(GLMOBJmodel)); model->pathname = stralloc(filename); model->mtllibname = NULL; model->numvertices = 0; model->vertices = NULL; model->numnormals = 0; model->normals = NULL; model->numtexcoords = 0; model->texcoords = NULL; model->numfacetnorms = 0; model->facetnorms = NULL; model->numtriangles = 0; model->triangles = NULL; model->nummaterials = 0; model->materials = NULL; model->numgroups = 0; model->groups = NULL; model->position[0] = 0.0; model->position[1] = 0.0; model->position[2] = 0.0; ImportOBJFile(filename); } bool COBJLoader::ImportOBJFile(char* filename) { GLuint numvertices; /* number of vertices in model */ GLuint numnormals; /* number of normals in model */ GLuint numtexcoords; /* number of texcoords in model */ GLuint numtriangles; /* number of triangles in model */ GLMOBJgroup* group; /* current group */ GLfloat* vertices; /* array of vertices */ GLfloat* normals; /* array of normals */ GLfloat* texcoords; /* array of texture coordinates */ GLuint material; /* current material */ GLfloat tmpYcoord; unsigned v, n, t; char buf[128]; numvertices = numnormals = numtexcoords = numtriangles = 0; FILE* file; file=fopen(filename,"r"); if(!file) { exit(1); } while(fscanf(file, "%s", buf) != EOF) { //每一次读一行 switch(buf[0]) { case '#': /* comment */ /* eat up rest of line */ fgets(buf, sizeof(buf), file); break; case 'v': /* v, vn, vt */ switch(buf[1]) { case '\0': /* vertex */ /* eat up rest of line */ fgets(buf, sizeof(buf), file); numvertices++; break; case 'n': /* normal */ /* eat up rest of line */ fgets(buf, sizeof(buf), file); numnormals++; break; case 't': /* texcoord */ /* eat up rest of line */ fgets(buf, sizeof(buf), file); numtexcoords++; break; default: exit(1); break; } break; case 'm': fgets(buf, sizeof(buf), file); sscanf(buf, "%s %s", buf, buf); model->mtllibname =stralloc(buf); ReadMTLFile(buf); break; case 'u': /* eat up rest of line */ fgets(buf, sizeof(buf), file); break; case 'g': /* group */ /* eat up rest of line */ fgets(buf, sizeof(buf), file); sscanf(buf, "%s", buf); group = AddGroup(buf); break; case 'f': /* face */ v = n = t = 0; fscanf(file, "%s", buf); /* can be one of %d, %d//%d, %d/%d, %d/%d/%d %d//%d */ if (strstr(buf, "//")) { /* v//n */ sscanf(buf, "%d//%d", &v, &n); fscanf(file, "%d//%d", &v, &n); fscanf(file, "%d//%d", &v, &n); numtriangles++; group->numtriangles++; while(fscanf(file, "%d//%d", &v, &n) > 0) { numtriangles++; group->numtriangles++; } } else if (sscanf(buf, "%d/%d/%d", &v, &t, &n) == 3) { /* v/t/n */ fscanf(file, "%d/%d/%d", &v, &t, &n); fscanf(file, "%d/%d/%d", &v, &t, &n); numtriangles++; group->numtriangles++; while(fscanf(file, "%d/%d/%d", &v, &t, &n) > 0) { numtriangles++; group->numtriangles++; } } else if (sscanf(buf, "%d/%d", &v, &t) == 2) { /* v/t */ fscanf(file, "%d/%d", &v, &t); fscanf(file, "%d/%d", &v, &t); numtriangles++; group->numtriangles++; while(fscanf(file, "%d/%d", &v, &t) > 0) { numtriangles++; group->numtriangles++; } } else { /* v */ fscanf(file, "%d", &v); fscanf(file, "%d", &v); numtriangles++; group->numtriangles++; while(fscanf(file, "%d", &v) > 0) { numtriangles++; group->numtriangles++; } } break; default: /* eat up rest of line */ fgets(buf, sizeof(buf), file); break; } } /* set the stats in the model structure */ model->numvertices = numvertices; model->numnormals = numnormals; model->numtexcoords = numtexcoords; model->numtriangles = numtriangles; group = model->groups; while(group) { group->triangles = (GLuint*)malloc(sizeof(GLuint) * group->numtriangles); group->numtriangles = 0; group = group->next; } model->vertices = (GLfloat*)malloc(sizeof(GLfloat) * 3 * (model->numvertices + 1)); model->triangles = (GLMOBJtriangle*)malloc(sizeof(GLMOBJtriangle) * model->numtriangles); if (model->numnormals) { model->normals = (GLfloat*)malloc(sizeof(GLfloat) * 3 * (model->numnormals + 1)); } if (model->numtexcoords) { model->texcoords = (GLfloat*)malloc(sizeof(GLfloat) * 2 * (model->numtexcoords + 1)); } /* rewind to beginning of file and read in the data this pass */ rewind(file); /* set the pointer shortcuts */ vertices = model->vertices; normals = model->normals; texcoords = model->texcoords; /* on the second pass through the file, read all the data into the allocated arrays */ numvertices = numnormals = numtexcoords = 1; numtriangles = 0; material = 0; while(fscanf(file, "%s", buf) != EOF) { switch(buf[0]) { case '#': /* comment */ /* eat up rest of line */ fgets(buf, sizeof(buf), file); break; case 'v': /* v, vn, vt */ switch(buf[1]) { case '\0': /* vertex */ fscanf(file, "%f %f %f", &vertices[3 * numvertices + 0], &vertices[3 * numvertices + 1], &vertices[3 * numvertices + 2]); numvertices++; break; case 'n': /* normal */ fscanf(file, "%f %f %f", &normals[3 * numnormals + 0], &normals[3 * numnormals + 1], &normals[3 * numnormals + 2]); numnormals++; break; case 't': /* texcoord */ fscanf(file, "%f %f", &texcoords[2 * numtexcoords + 0], &tmpYcoord); texcoords[2 * numtexcoords + 1] = -tmpYcoord; numtexcoords++; break; } break; case 'u': fgets(buf, sizeof(buf), file); sscanf(buf, "%s %s", buf, buf); group->material = material = FindMaterial(buf); break; case 'g': /* group */ /* eat up rest of line */ fgets(buf, sizeof(buf), file); sscanf(buf, "%s", buf); group = FindGroup(buf); group->material = material; break; case 'f': /* face */ v = n = t = 0; fscanf(file, "%s", buf); /* can be one of %d, %d//%d, %d/%d, %d/%d/%d %d//%d */ if (strstr(buf, "//")) { /* v//n */ sscanf(buf, "%d//%d", &v, &n); model->triangles[numtriangles].vindices[0] = v; model->triangles[numtriangles].nindices[0] = n; fscanf(file, "%d//%d", &v, &n); model->triangl