Engoo

[qbism]

Lots of array indexing. Maybe unroll the standard non-RGB MIP loop first and copy it two times (R, G, B).

[leileilol]

Somehow i think that would go slower, and would also bring up the issue of doing the 24to8 lookup thrice

anyway i've committed the unroll crap

[mankrip]

[qbism]

How much could RGB color and map textures be crunched into fewer bytes and still look decent when the output is 8 bit? 12 bit color may be as good as 24bit. Can it get low enough to do more indexing with target memory range? 32mb DOS maybe no. 512mb XP maybe yes.

[leileilol]

[mh]

If I was going to do this, the way I'd do it would be to make 3 separate colormaps - one for each of R, G and B, then output to 3 separate color buffers - one again for each of R, G and B. Mix them together at swapbuffers time to get the final image.

I have no idea what the performance would be like, but the main advantages I see would be that you get to keep the original ASM code (with all of it's wacky Abrash optimizations) because you're writing to 8-bit targets, and various blends/colour shifts/palette hackery/etc can be done more-or-less for free because they can be applied during the final mix.

[leileilol]

[mh]

It shouldn't be a problem with fullbrights at least; you'd have 3 colormap tables (you really only need one though) each of 256x64 bytes and each translating a 0..255 base to it's lit equivalent, so you could maintain fullbright columns in the table.

[qbism]

[leileilol]

I actually have the 3 blocks thing half-implemented (generating the 3 color maps as theorized even). I have to swap it in the blockdrawer and call the block drawer thrice.

HOWEVER what I have a problem with is lightwidth. How the hell do I add that necessary " * 3" in the ASM?


Also, merging surfrowbytes, or prowdest? Sometimes i'm confused where it's writing to.

[taniwha]

lea eax, [eax + 2*eax] (or something very similar, I might have the syntax wrong). iirc, it's 1 clock cycle (or was on a 486).

that's probably the fastest 3 * you can get in asm (though using something other than eax as the dest might help, I don't know).

[leileilol]

leal (%ecx + 2*%ecx),%ecx // works

anyhow i have committed the experimental mess for you to laugh, i mean look at. Trying to make new prowdests with the separate components is easier said than done (and it's not done )

[leileilol]

I tried to apply dithering to models


Also you know what looks neat? Colored chiaroscuro

[leileilol]

[ceriux]