Yeah I think it went all the way up to 640x480 (?)
But as I recall most games ran 320x200 or thereabout and probably at a blistering 20fps or so :)
Don't know an actual sane usecase other than there are plenty of PSOnes out there and it would be cool if someone desoldered GPU+Vram and used it for something :D
As far as I understand the GPU itself has a simple 32 bit host port for a cpu to communicate with and issue draw commands.
I believe/hope you can ignore the DMA channels and upload texture data through the host-port too.
It doesn't know anything about 3D so transforms has to be done on CPU and in the end ask the GPU to draw 2D triangles or quads, which it can do pretty quickly and even texture-map them (without perspective correction = the classic 'wobbly' texture issue on playstation1 games)
Also doesn't even have a Z-buffer so the programmer needs to sort primitives by their average Z and draw them back-to-front.
This causes plenty of per-face Z fighting issues, but who cares.. it was still mind blowing for a mid 90's home console.
"Perfect is the enemy of good" :)
But for Atari machines in general it feels like there must be an opportunity to use the ATW800/2 card to do some pretty neat stuff?
With the transputer having direct access to the framebuffer perhaps someone will experiment adding some more gpu-like features to it someday.
Sprite scaling/rotation, triangles and whatnot being drawn by transputer while the 68k is doing other things? Maybe even do the 3D transforms on the transputer side. (Though I don't have a card and have no idea about performance and practical viability of using it for those kinds of things :) )
