I'm trying to implement a blur effect, using shaders. I've never used render targets before, so right now I just have a program that copies from one render target to another (no blurring...just copy). I'm noticing that each time I do this copy my image is becoming more and more off-center. I've attached images, the first has run through the copy process 5 times, the second has run through the process 50 times.
I can give a more detailed explanation if someone is willing to help me, or this may just be an obvious beginner mistake. Thanks.
Image becoming off-centered when using render targets
You're not accounting for the fact that the way in which D3D9 addresses a screen's pixels and texture's texels is not the same.
See: http://msdn.microsoft.com/en-us/library/bb219690%28v=vs.85%29.aspx
See: http://msdn.microsoft.com/en-us/library/bb219690%28v=vs.85%29.aspx
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