we are currently in the process of updating our 3D engine to support OpenGL 3.1 and 3.2. So far everything works just fine, however we can’t get gl_ClipDistance to work in the vertex shader on NVIDIA drivers. We always receive the following error when compiling the shader:
error: unknown builtin varying parameter (named gl_ClipDistance) encountered
The same code works just fine on ATI card’s which is rather surprising considering the fact that NVIDIA has done such a good job on OpenGL in the past.
Could someone provide me with a sample shader or explain to me why we get this error on NVIDIA cards? We already have installed the latest driver 190.62.