Re: Returning calculation results from pixel shader

Why don't you create a R32F lockable RT-texture
(your gf6 card should allow that), render to
it, and get it's data back by calling
IDirect3DDevice9::GetRenderTargetData?

But I do... now ;-)
Thanks for the hint. I was not aware of the GetRenderTargetData. It
works just fine now.
If I may; I have a folow up on this. Perhaps I am misunderstanding the
graphicsStream.Read. Currently I am doing this for reading out data.

private void readResult(float[,] errorValues)
device.GetRenderTargetData(renderSurface, readSurface);
GraphicsStream gs = readTexture.LockRectangle(0, LockFlags.ReadOnly);
float[,] tmp = (float[,])gs.Read(typeof(float), new int[] { dataWidth,
dataHeight });

for (int x = 0; x < dataWidth; x++)
for (int y = 0; y < dataHeight; y++)
errorValues[x, y] = tmp[x, y];

It seems rather wastefull to have a loop like that to read data out.
Besides.. have the data not allready been moved once from the gpu to
systemmemory, and now I am moving them from system to system?

.

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