Function LoadObjWithCallback

Chapter_39/tiny_obj_loader.h:2642–2923

	}

	bool LoadObjWithCallback(std::istream &inStream, const callback_t &callback,
		void *user_data /*= NULL*/,
		MaterialReader *readMatFn /*= NULL*/,
		std::string *warn, /* = NULL*/
		std::string *err /*= NULL*/) {
		std::stringstream errss;

		// material
		std::map<std::string, int> material_map;
		int material_id = -1;  // -1 = invalid

		std::vector<index_t> indices;
		std::vector<material_t> materials;
		std::vector<std::string> names;
		names.reserve(2);
		std::vector<const char *> names_out;

		std::string linebuf;
		while (inStream.peek() != -1) {
			safeGetline(inStream, linebuf);

			// Trim newline '\r\n' or '\n'
			if (linebuf.size() > 0) {
				if (linebuf[linebuf.size() - 1] == '\n')
					linebuf.erase(linebuf.size() - 1);
			}
			if (linebuf.size() > 0) {
				if (linebuf[linebuf.size() - 1] == '\r')
					linebuf.erase(linebuf.size() - 1);
			}

			// Skip if empty line.
			if (linebuf.empty()) {
				continue;
			}

			// Skip leading space.
			const char *token = linebuf.c_str();
			token += strspn(token, " \t");

			assert(token);
			if (token[0] == '\0') continue;  // empty line

			if (token[0] == '#') continue;  // comment line

			// vertex
			if (token[0] == 'v' && IS_SPACE((token[1]))) {
				token += 2;
				// TODO(syoyo): Support parsing vertex color extension.
				real_t x, y, z, w;  // w is optional. default = 1.0
				parseV(&x, &y, &z, &w, &token);
				if (callback.vertex_cb) {
					callback.vertex_cb(user_data, x, y, z, w);
				}
				continue;
			}

			// normal