是否可以使用一个明暗器来查找两个纹理之间的“差异”?(XNA/HLSL)

我制作了一个简单的基于网络摄像头的应用程序,它可以检测“运动边缘”,从而绘制出一个纹理,显示当前帧的像素与前一帧有显著不同。这是我的代码:

// LastTexture is a Texture2D of the previous frame.
// CurrentTexture is a Texture2D of the current frame.
// DifferenceTexture is another Texture2D.
// Variance is an int, default 100;

Color[] differenceData = new Color[CurrentTexture.Width * CurrentTexture.Height];
Color[] currentData = new Color[CurrentTexture.Width * CurrentTexture.Height];
Color[] lastData = new Color[LastTexture.Width * LastTexture.Height];

CurrentTexture.GetData<Color>(currentData);
LastTexture.GetData<Color>(lastData);

for (int i = 0; i < currentData.Length; i++)
{
    int sumCD = ColorSum(currentData[i]); // ColorSum is the same as c.R + c.B + c.G where c is a Color.
    int sumLD = ColorSum(lastData[i]);
    if ((sumCD > sumLD - Variance) && (sumCD < sumLD + Variance))
        differenceData[i] = new Color(0, 0, 0, 0); // If the current pixel is within the range of +/- the Variance (default: 100) variable, it has not significantly changes so is drawn black.
    else
        differenceData[i] = new Color(0, (byte)Math.Abs(sumCD - sumLD), 0); // This has changed significantly so is drawn a shade of green.
}

DifferenceTexture = new Texture2D(game1.GraphicsDevice, CurrentTexture.Width, CurrentTexture.Height);
DifferenceTexture.SetData<Color>(differenceData);

LastTexture = new Texture2D(game1.GraphicsDevice,CurrentTexture.Width, CurrentTexture.Height);
LastTexture.SetData<Color>(currentData);

有没有一种方法可以使用着色器将此计算卸载到GPU(使用上述方法,它可以以大约25/26 fps的速度进行计算,但速度有点慢)?我对HLSL材质球的工作原理有一个基本的了解,并不期望有一个完整的解决方案,我只是想知道这是否可行,以及如何从材质球中获得“差异”纹理数据,以及这是否真的更快。

事先谢谢。