Eniko FoxMar 15

RE: https://mastodon.gamedev.place/@eniko/116232581608004216

instead of dealing with any of that i spent the afternoon refactoring so that i can include my library multiple times with different suffixes. this will be useful for supporting different color bit depths and such without making my code completely impossible to maintain

Show threadEniko Fox

i was looking at 9 functions

1. flat color
2. gouraud
3. luminance grayscale
4. luminance with color ramp
5. textured
6. textured with flat color
7. textured with gouraud
8. textured with luminance grayscale
9. textured with luminance with color ramp

times 6 color depths (32, 24, 16 555 & 565, 8 332 and 8 bits with CLUT) is 54

(times two for depth buffer is 108)

now instead it can just be one include per desired supported mode

Mar 15 at 3:46pmWeb
Show threadEniko FoxMar 15
though tbh i'm dubious on the usefulness of 24 bit vs 32 bit color
Show threadEniko FoxMar 15
as you can see the 332 bit rgb 8 bit mode is working perfectly
Show threadEniko FoxMar 15
its ok don't worry i fixed it
Show threadEniko FoxMar 15

ok it's actually looking proper now except that it throws an access violation when i exit so that's probably not an amazing sign

update: i fixed the access violation

Show threadEniko FoxMar 15

you're telling me 3 bits of red/green and 2 bits of blue isn't enough to smoothly gouraud shade a triangle? i'm shocked, shocked!

well. not that shocked

Show threadEniko FoxMar 15
really had to amp up the brightness boost for this to work but gouraud shaded rotating 8 bits per pixel skull is real
Show threadEniko FoxMar 15

anyway now i can support all sorts of customizations, including different color modes easily. all you gotta do is include the header again for the mode you want:

⋕undef AFINETRI_H
⋕define AFINETRI_SUFFIX _Rgb8
⋕define AFINETRI_MODE_RGB8
⋕include "afinetri.h"

and there won't be a combinatorial explosion and my code won't become as much of a godawful mess so that's neat

Show threadEniko FoxMar 15
ok, that's it. *dithers your 8 bit gothic wall skull*
Show threadEniko FoxMar 15
bonus dithered gouraud
Show threadEniko Fox6d ago
made it so it dithers flat color triangles too. the 16 colors for the pattern are calculated once, before the triangle renders
Show threadTom ForsythMar 15
@eniko Looks like the green dither isn't "big" enough? Red and blue look fine.
Show threadEniko FoxMar 15
@TomF yeah I was playing with different dither strengths for each color channel
Show threadgkrnoursMar 15
@eniko ps1 vibe
Show threadAlice Averlong🏳️‍⚧️Mar 15
@eniko That looks lovely!
Show threadEfi (nap pet) 🦊💤Mar 15
@eniko hot!
Show thread0x0961hMar 15
@eniko noooo... not my 8 bit gothic wall skull 😭
Show threadMister Dave6d ago
@eniko wall skull in da club
Show threadfabiosantoscode6d ago
@eniko tasty!!
Show threadalina cyborg mouse Mar 15
@eniko it looks glorious
Show threadMaiaMar 15
@eniko just needs a touch of dither spice
Show threadTom ForsythMar 15
@eniko Just means you need more dither :-)
Show threadTom ForsythMar 15

@eniko When I was writing drivers for 3D cards back in 1997, one thing our card didn't have was MSAA. But we could of course do dumb SSAA - just render 4x bigger, then shrink down.

I figured out we could do the 4x render in 332 with dithering, then when we did the shrink we'd read that but render to 565, because the extra colour bits came from blending the dithered pixels together.

I sent A/B pictures around the office, and nobody could tell the difference, but it was 15% faster. SHIP IT!

Show threadTom ForsythMar 15

@eniko There was one game it didn't work that great for, because it was a game that had almost no textures, just gouraud shading, and they used a lot of blue lighting. And since the scenes were so simple, of course they turned on AA.

Well, you can dither 2 bits all you want, but it's still not going to look great. The developer was impressed by my inventiveness, but I put in an escape to detect his game and switch back to normal 565 for it (yes, "quack.exe" was real - everybody did it)

Show threadRobin GreenMar 15
@TomF @eniko You are a QA nightmare.
Show threadjellMar 15
@fatlimey @TomF @eniko Gosh, I'm glad those days are behind us! *camera slowly pans over to modern drivers*
Show threadTim AidleyMar 15
@TomF @eniko Fuck yeah
Show threadEniko FoxMar 15
@TomF that's kind of amazing
Show threadTom ForsythMar 15
@eniko I remember being pretty sure it wouldn't work, but I had to know...
Show threadDaniel GibsonMar 15
@TomF @eniko
I observed a similar effect with some people's profile pictures here (forgot who :-/): when they're small (in the timeline) they look almost like photographs, but when looking at their profile so the picture is bigger it turns out to be pixelart with dithering
Show threadBill RickerMar 15
@Doomed_Daniel @TomF @eniko
You probably weren't referring to me; mine is a dithered photo. [And a different dither on alt @BRicker ]
Show threadDaniel GibsonMar 15
@n1vux @TomF @eniko @BRicker
no, but yours also shows how well downscaling dithered images works :)
Show threadBill Ricker6d ago
@Doomed_Daniel
FWIW, I uploaded that at the same 339×339 resolution it has stored and is returning, with block mega-pixels formed intentionally in the dither process (Fotocx), which cranks down the PNG size greatly, and allows sub-sampling to be harmless from what I planned. IIRC I had to select a square from the vertical 339×420 dither output
Show threadLizzie Crowdagger Mar 15
@TomF @eniko "I beg to dither"
Show threadBill RickerMar 15

@crowdagger

😆👍 well played!

@TomF @eniko

Show threadeclexicMar 15
@eniko hey look, I don't need to squint that hard for it to look like a perfectly smooth gradient. Just advise players to squint at all times through very large text in the tutorial.
Show threadWildRose😈🌹🏳️‍⚧️✅Mar 15
@eniko plz dither, I want to see this work.
Show threadBill RickerMar 15
@eniko SMOOTHLY is a key word there. Isn't too bad aside from the smooth 😎!
Show threadTom ForsythMar 15
@eniko Thankyou for playing Wing Commander
Show threadPaul LalondeMar 15
@eniko I see the problem - there is no gouraud shaded triangle.
Show thread🌈 Andrew ☄️Mar 15
@eniko I wonder if instead of all the combinations you could make the triangle function an iterator, then use composition:
```
struct tri_iter iter = make_iter(triangle);
struct tri_iter_data = TRI_ITER_DATA_ZERO;
while tri_iter_next(&iter, &texel_data) {
struct rgb8 c = sample_tex2(tex, texel_data.uv);
c = lighting(c, light, lerp2(texel_data.uv, …));
buffer[texel_data.index] = rgba8_to_rgb555(c);
}
```
Show threadEniko FoxMar 15
@bnut i *could* do that, but it would almost certainly be much slower? if only for the iterator logic
Show thread🌈 Andrew ☄️Mar 15
@eniko Not sure, it definitely puts more work on the compiler’s optimiser, but depending on what your logic was and with inlining it may be similar. Although if the #define method works then that’s great :) it’s a pity C doesn’t have closures.
Show thread🌈 Andrew ☄️Mar 15
@eniko it’d likely make dithering harder though