Perhaps one solution here would be to produce 4x 1024x1024 textures instead of 1x 2048x2048 texture from a 1440x1152 SDL surface (used for XAMOS scrolling background screen). Not exactly trivial to implement, however. I'd need an array or C++ vector of GL textures per converted surface.

Another general SDL OpenGL issue is that converting SDL surfaces to OpenGL textures seems dog-slow, even using glTexSubImage2D instead of glTexImage2D (where appropriate).

I'll probably leave MorphOS TinyGL support for a later version than the up-and-coming XAMOS 0.28. Software rendering with SDL is still supported of course, but is painfully slow on MorphOS (as anyone who's tried the current version of XAMOS can attest to).

Does the Powerbook G4's Radeon support bigger textures than 1024x1024?