I just did some kind of opengl / glsl demo and i noticed that some of the scenes appeared simply black or seemed to have some components clampled between 0.8 and 1 instead of 0 to 1.
Seems like the GLSL shaders compile everywhere; they are also validated on the 3DLabs tool. On all ATI cards, the demo looks correct. On all GeforceFX and up cards, the issue above appears.
It is interresting to note that most scenes use the same shader, and most scenes are rendered correctly on the nvidia cards. The only "fancy" thing is maybe using not really standard blending modes.
I wondered if anyone had this issue before me, and if so, how to overpass it..
have a nice day..