AMD Radeon HD 5770 + GL_SAMPLE_ALPHA_TO_ONE
I'm using Catalyst 11.2 under Win7-64, and I'm trying to create 'imposters' with proper alpha channel by using render to texture and alpha-to-coverage.
To have a proper alpha channel value, I enable 'GL_SAMPLE_ALPHA_TO_ONE', which works as expected with an NVidia board, but not on AMD.
I also noticed that on AMD there's not more dithering applied for 'alpha to coverage'.
Does anyone have recommendations or workarounds to share for AMD and sample coverage ?
NVidia result :
AMD result :