Hi all, I noticed, that wine checks for GL_ARB_imaging, before performing operations like glBlendColor, glBlendEquation etc. However it appears that the ATI drivers do not support this extension, though they do support the blending operations.
I posted about this on the Rage3d linux driver boards, and the response seems to suggest that it would be better to check for the individual operations rather than the GL_ARB_imaging extension. See bottom of http://rage3d.com/board/showthread.php?t=33814685 What do you guys think? Kap.
