readPixels method
Implementation
readPixels(int x, int y, int width, int height, int format, int type, Uint8List data) {
final dataPtr = uint8ListToArrayPointer(data);
gl.glReadPixels(x, y, width, height, format, type, dataPtr);
Uint8List _data = dataPtr.asTypedList(data.length);
data.setAll(0, _data);
calloc.free(dataPtr);
}