Under deprecated functionality the GL 3.0 spec says:
“Legacy pixel formats - all ALPHA LUMINANCE, LUMINANCE_ALPHA, and
INTENSITY external and internal formats”…
should that be ALPHA comma LUMINANCE? (e.g. GL_ALPHA and GL_LUMINANCE) or does “ALPHA LUMINANCE” mean just those formats with LUMINANCE in the name (e.g. GL_LUMINANCE only)?