How to check if a texture contains colour, FAST?

de3000 · Post by **de3000** » Fri Mar 11, 2011 7:02 am

I am trying to handle some projection mapping with photon goodness involved. There are some cases where the texture which I need to project does not contain any colour except black.

At the moment I use glsl reduction to check if there are any pixels with colour in them. I was wondering if anyone knows of a faster way to check if a texture has a colour other than black.

REDDemon · Post by **REDDemon** » Fri Mar 11, 2011 7:11 am

faster than a shader? I don't think is possible.

de3000 · Post by **de3000** » Fri Mar 11, 2011 7:26 am

Faster in a shader, I still need the shader.