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"sum all pixels" shader

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Hi... How can i sum all pixels of a texture with a shader? The Texture is really small (16x16 or 32x32) for every side of an cube map, and it will contain float values. One could try to to manually create mipmaps, cos mipmap creation is not supportet for float tex`s, right?. Maybe i could use a global variable? But how can i read this value back? tnx, gsus

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There is no way to get the value back in a "variable". You can
render to an image or use NVidia''s pixel data range to get it
into a vertex array. But its simply a loop, as the previous poster has pointed out. This means that your hardware needs
to have the state of the art pixel shader 3.0 support. The final
answer has to be written into the resulting image. Basically, all you have to do is to run the pixel shader while rendering
one pixel with texture mapping enabled and correct texture chosen. The resulting image will have the summed color. This
is ofcourse subject to hardware limitations.


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