The only difference is the video hardware. I'm no expert, but having to do several writes to fill each pixel, when the PC only needs to do it once seems like major disadvantage for the Miggy. Thus, we need to rely on c2p conversion to get things done at a reasonable speed.
The "PC" was not ahead in the beginning. Look at the original spec of VGA and you will find planar gfx also. The Amiga gfx were ahead of the original VGA spec. The difference was the amazing advance of PC gfx from VGA to super VGA to 3D accelerated Voodoo gfx before the Amiga could even get AGA or chunky modes that left the Amiga in the dust.
The question is: Can one of you clever coders get blazing fast c2p conversion done on a 68000? Or can you do some miraculous planar 3d engine? If not, we will have to accept that our beloved little miggies were behind even contemporary PC's, at least in some aspects.
I would rather look at a little higher spec than that. How about 68020+ with RTG gfx. This should be possible on the higher end Amiga classics as well as the upcoming fpga Amigas and UAE/AROS emulated machines in descent quality. There has already been some work to this end with Wazp3D and my optimization of an unofficial Warp3D. I can run QuakeGL in 640x400 at 20-25 fps on a 68060 classic Amiga with Voodoo 4. The overall optimization level is still quite poor. I think 800x600 would be possible at 30 fps. The Natami should be capable of significantly more. Software 3D rendering can be up to 1/2 the speed of hardware rendering if perfect rendering is not required and lower resolutions are chosen. Progress is unfortunately quite slow and what kills the Amiga.
