🚀 go-pugleaf

> Sorry for popping in in the middle of discussion and without a clear
> knowledge of what exactly are you comparing, but I have some information
> regarding the speed differences of mode 320x400x256 and mode 13h.

No problem.

> Background: I am working on a 3D space game that uses 256-color shaded
> polygons, among other things. I have a viewport on the screen (256x240
> pixels on 320x400 mode and 256x122 pixels on mode 13h). I need to clear
> this viewport and draw all the polygons on it during every frame. My
> 320x400 mode uses double-buffering, naturally, and mode 13h uses a separate
> 256x122 memory buffer which is then copied to screen (rep movsw).
> 
> I have found that in this situation the 320x400x256 mode is MUCH faster.
> On my 486/33 machine I can reach around 50 frames/sec in that mode, where
> mode 13h (although it has only half the number of pixels to update) runs
> at less than 30 frames/sec. The speeds may seem slow, but that is because
> my game plays digitized four-channel tracker music in the background at
> the same time, and the polygon boundaries are anti-aliased in real time.
> 
> I think the speed difference is a direct result of the ability to clear
> or draw 8 pixels per one STOSW or MOVSW instruction on 320x400 mode,
> where it only draws 2 pixels on mode 13h. Very important.
> 
> Was this what you were comparing?
> 
That's what I wanted to know...
Josh