What is the real power of Akiko chip in cd32 ?

[commodorejohn]

Well, if matthey is right and this is just a straight recompile from source, it's understandable that it wouldn't run all that great (though it depends on what compiler is used.) What I'm a little surprised at is that nobody's done a 68k-optimized version yet...

[commodorejohn]

Doom uses a fairly simple (and efficient) 2D BSP and optimised column and span texturing routines for walls and floors and a sprite routine for objects, each of which has been pretty well-tuned.

Just curious, you make it sound like Doom has separate rendering code for sprites? I guess I'd kinda figured it'd just reuse the column routine, since that's capable of transparency anyway.

[commodorejohn]

It might do, but sprites are a special case as they are always "face on" and thus don't require anything beyond scaling - certainly not the recalculation of scale per column that walls do. It would seem an obvious case where an optimisation could be made.

Oh. Thought you were talking about the column renderer specifically.

Though I suppose it might help to have a separate column renderer for sprites and walls with transparency in their textures, only I don't know if Doom marks those specially or not.