Hi,
I am using glReadPixels() to readout my framebuffer. When doing this in SLI anitialiasing mode the usuall black level of the alpha values are at 50% grey. A glCopyTexSubImage2D() call however works fine.
Of cause in SLI single-GPU rendering mode glReadPixels() works too.
SLI with two 7800GTX, Dual Opteron, NVidia 81.95 driver.
Any help on this would be appreciated!