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);
+}