So it seems like about 50%, or more, of what OpenGL v2.1 is supposed to be capable of offering is currently either not fully supported, or only partially supported in MorphOS, from what bigfoot's chart shows. I have ignored the Colour Index Mode as that seems to be irrelevant, from what bigfoot states. So ...

Function status . . . . . Count . . . . . . Percent
Fully supported. . . . . . . . . . 12 . . . . . . . . . . . 2.2
Function exists . . . . . . . . . . 229 . . . . . . . . . . 41.6
Macro exists . . . . . . . . . . . . . 51 . . . . . . . . . . . 9.3
Not supported . . . . . . . . . . . 246 . . . . . . . . . . 44.6

On that basis, maybe we would need to know the timescale/effort/workload estimated to bring OpenGL v2.1 to the point where basically all, or at least virtually all of the essential components, or the most beneficial ones, needed to make it work as intended is completed, and for a basic cost for the work that it would require to manage this, to see if this is feasibly fundable with a bounty, I suppose?