uniformMatrix4fv method
be careful, data always has a length that is a multiple of 16
Implementation
void uniformMatrix4fv(UniformLocation location, bool transpose, Float32List values) {
startCheck('uniformMatrix4fv');
gl.glUniformMatrix4fv(location.id, values.length ~/ 16, transpose ? 1 : 0, values);
checkError('uniformMatrix4fv');
}