I've got a question for GLSL 1.40 that could use some interpretation:
Section 1.2.5 in the spec says:
"The following features, previously deprecated, are removed:
...
Fixed functionality for a programmable stage. Supply shaders for
all stages currently being used."What exactly does this mean? Undefined results? Link error? Draw time error? I couldn't find anything explicit in the 3.1 core spec (since it doesn't have fixed function, so it doesn't really explain interaction with it) or the compat spec (since it has ARB_compatibility, so that deprecated functionality is re-allowed). I think my resolution would be: Don't expose GLSL 1.40 outside of a GL 3.1+ core context, thus dodging the question of how to interact between the FF and GLSL 1.40 without GL_ARB_compatibility exposed.
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