TinyGL should work as specified by the OpenGL standards.

However, afaik, there have been some bigger changes recently (using shaders internally for some things) and because of that, some things might not yet work quite as expected (even if they worked before), and might work differently on different gfx cards.

afaik, f.ex. texture matrix transformations don't work at all, at least on some gfx cards. No idea about glMaterial* (haven't used anything but grayscale on MorphOS myself lately, so might have missed that myself)

It can help, if you list all the functionality, that doesn't seem to work properly.