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GoldSrc D3D rainbow lightmap bug

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First post, by Pufferfish9billion

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I wanted to play GoldSrc games in D3D due to overbright working out of the box and better performance, but D3D produces these ugly rainbow pixels on the textures. I believe it might be related to the lightmaps but idk. I tried WON 1.0.1.6, 1.1.1.0, 2005 Anthology and others but they all have the exact same issue (regardless of game/mod). Is this a bug or is it just how D3D works? OGL doesn't do this but overbright doesn't work on OGL by default.

Specs:
Windows 10 64bit
16GB RAM dual channel
AMD Ryzen 3200g
AMD Vega 8

Dust 2 is one of the nastier examples, so I chose it for reference.

D3D
d3d.jpg

OGL
ogl.jpg

Reply 1 of 4, by BEEN_Nath_58

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Which game/build is this?

The rainbow looks like failed dithering in 16bit colours

previously known as Discrete_BOB_058

Reply 2 of 4, by leileilol

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natural phenomenon of the RGB565 texture format as the green bit is a larger range. There's no option to change this for D3D afaik, doesn't have to do with overbright or screen color depth

apsosig.png
long live PCem

Reply 3 of 4, by Pufferfish9billion

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leileilol wrote on 2024-05-27, 05:10:

natural phenomenon of the RGB565 texture format as the green bit is a larger range. There's no option to change this for D3D afaik, doesn't have to do with overbright or screen color depth

So it's meant to look this way? That sucks. I guess I'll have to figure out overbright in OGL then. Thanks for the reply.

Reply 4 of 4, by leileilol

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It probably looks better in GL as the overbright luxels get shifted out so the color range is better for 565

apsosig.png
long live PCem

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