Is there a way to plot a surface/texture on anything OTHER than a rectangle?
This would require a function accepting (all) vertex positions… to produce such an arbitrary Quad.
I’d assume openGL would have such projection functions but then again the promise stated on this talk  about having something like a “Duke Nukem 3D” on SDL alone or, at least having the top edge smaller for much simpler stuff like , would then be much easier to do. : )
EDIT: I’d probably shouldn’t say “projection”, it really only needs to deform the image ‘linearly’ / no perspective.