Can somebody tell me what this means?
Fragment info
error: unknown fragment shader builtin varying parameter (named gl_FrontFacing) encountered
Shaders failed to link, exiting…
Greetz,
Nico
It much likely means that the current GL-implementation can’t use gl_FrontFacing. It’s in the specs, but at least on ATI (haven’t tried with newest drivers), there was no hardware support for gl_FrontFacing.
Accessing the fragment.facing attribute in nv fragment program seems to work just fine. Must be the glsl drivers then.
Nico
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