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PocketMatrix • View topic - Get pixel location from shader
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Get pixel location from shader


Get pixel location from shader

Postby noaktree » Oct 3, 2005 @ 12:34pm

Hi,

I just found PocketFrog and am interested in the pixel shaders. I see that you can get the color of the source and destination pixels within the shader. Is there an easy way to get the current pixel's screen (x,y) location?

I made this:

If you look at the source you will see that I did a cheap trick to maintain a pixel cursor during a fragment run. This only works with non-masked rectangular sprites though.

Thanks,
Neil
noaktree
 


Postby fast_rx » Oct 3, 2005 @ 1:56pm

I think you'd be better off using a surface lock operation... and it could be faster than using the shader.
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