public void OnResize(DeviceContextHolder holder) {
var width = holder.Width;
var height = holder.Height;
var bloomBlur = 8f;
CalculateGaussian(1f / width, 0, bloomBlur, out _hosw, out _hoso);
CalculateGaussian(0, 1f / height, bloomBlur, out _vosw, out _voso);
}