Example #1
0
RES ResourceFormatPKM::load(const String &p_path, const String &p_original_path, Error *r_error) {

	if (r_error)
		*r_error = ERR_CANT_OPEN;

	Error err;
	FileAccess *f = FileAccess::open(p_path, FileAccess::READ, &err);
	if (!f)
		return RES();

	FileAccessRef fref(f);
	if (r_error)
		*r_error = ERR_FILE_CORRUPT;

	ERR_EXPLAIN("Unable to open PKM texture file: " + p_path);
	ERR_FAIL_COND_V(err != OK, RES());

	// big endian
	f->set_endian_swap(true);

	ETC1Header h;
	ERR_EXPLAIN("Invalid or Unsupported PKM texture file: " + p_path);
	f->get_buffer((uint8_t *)&h.tag, sizeof(h.tag));
	if (strncmp(h.tag, "PKM 10", sizeof(h.tag)))
		ERR_FAIL_V(RES());

	h.format = f->get_16();
	h.texWidth = f->get_16();
	h.texHeight = f->get_16();
	h.origWidth = f->get_16();
	h.origHeight = f->get_16();

	PoolVector<uint8_t> src_data;

	uint32_t size = h.texWidth * h.texHeight / 2;
	src_data.resize(size);
	PoolVector<uint8_t>::Write wb = src_data.write();
	f->get_buffer(wb.ptr(), size);
	wb = PoolVector<uint8_t>::Write();

	int mipmaps = h.format;
	int width = h.origWidth;
	int height = h.origHeight;

	Ref<Image> img = memnew(Image(width, height, mipmaps, Image::FORMAT_ETC, src_data));

	Ref<ImageTexture> texture = memnew(ImageTexture);
	texture->create_from_image(img);

	if (r_error)
		*r_error = OK;

	return texture;
}