4 * require_extensions: GL_ARB_shading_language_420pack
7 * From the GL_ARB_shading_language_420pack spec:
9 * "It is an error to use auxiliary storage qualifiers or interpolation
10 * qualifiers on an output in a fragment shader."
12 * Test that an interpolation qualifier on a fragment shader output results in
16 #extension GL_ARB_shading_language_420pack: enable