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-rw-r--r--converter.c67
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);
+}