diff options
Diffstat (limited to 'converter.c')
-rw-r--r-- | converter.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/converter.c b/converter.c new file mode 100644 index 0000000..ded4f5d --- /dev/null +++ b/converter.c @@ -0,0 +1,67 @@ +#define TINYOBJ_LOADER_C_IMPLEMENTATION +#include <tinyobj_loader_c.h> + +static tinyobj_attrib_t attrib; +static tinyobj_material_t *materials = NULL; +static size_t num_materials; + +static void read_file(void *ctx, const char *filename, const int is_mtl, const char *obj_filename, + char **data, size_t *len) +{ + char *last_delim = strrchr(obj_filename, +#ifdef _WIN32 + '\\' +#else + '/' +#endif + ); + char path[strlen(obj_filename) - (last_delim ? strlen(last_delim) + 1 : 0) + 1]; + if (is_mtl && last_delim) { + last_delim[0] = '\0'; + sprintf(path, "%s/%s", obj_filename, filename); + } else + strcpy(path, filename); + ((void (*)(const char *, char **, size_t *))ctx)(path, data, len); +} + +void pv_parse(unsigned int *num_triangles, size_t *tex_name_len, const char *model, void *file_reader) +{ + tinyobj_shape_t *shapes = NULL; + size_t num_shapes; + tinyobj_parse_obj(&attrib, &shapes, &num_shapes, &materials, &num_materials, model, read_file, file_reader, + TINYOBJ_FLAG_TRIANGULATE); + tinyobj_shapes_free(shapes, num_shapes); + *num_triangles = attrib.num_face_num_verts; + *tex_name_len = strlen(materials[0].diffuse_texname); +} + +void pv_convert(float *data, char *texture) +{ + static const size_t stride = 5; + for (unsigned int i = 0; i < attrib.num_face_num_verts; i++) { + tinyobj_vertex_index_t idx0 = attrib.faces[i * 3]; + tinyobj_vertex_index_t idx1 = attrib.faces[i * 3 + 1]; + tinyobj_vertex_index_t idx2 = attrib.faces[i * 3 + 2]; + float v[3][3]; + for (size_t j = 0; j < 3; j++) { + v[0][j] = attrib.vertices[idx0.v_idx * 3 + j]; + v[1][j] = attrib.vertices[idx1.v_idx * 3 + j]; + v[2][j] = attrib.vertices[idx2.v_idx * 3 + j]; + } + float t[][2] = { + attrib.texcoords[idx0.vt_idx * 2], 1.0f - attrib.texcoords[idx0.vt_idx * 2 + 1], + attrib.texcoords[idx1.vt_idx * 2], 1.0f - attrib.texcoords[idx1.vt_idx * 2 + 1], + attrib.texcoords[idx2.vt_idx * 2], 1.0f - attrib.texcoords[idx2.vt_idx * 2 + 1] + }; + for (size_t j = 0; j < 3; j++) { + data[(i * 3 + j) * stride + 0] = v[j][0]; + data[(i * 3 + j) * stride + 1] = v[j][1]; + data[(i * 3 + j) * stride + 2] = v[j][2]; + data[(i * 3 + j) * stride + 3] = t[j][0]; + data[(i * 3 + j) * stride + 4] = t[j][1]; + } + } + strcpy(texture, materials[0].diffuse_texname); + tinyobj_attrib_free(&attrib); + tinyobj_materials_free(materials, num_materials); +} |