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backend: gl: don't add dither where it's not needed

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If a pixel is perfectly representable as an 8-bit number, don't add
dither. Reduce artifacts where dither is unnecessary.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui 2022-11-30 12:13:09 +00:00
parent 1271839baf
commit d704e0f80e
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GPG key ID: D3A4405BE6CC17F4
1 changed files with 3 additions and 1 deletions
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4
src/backend/gl/shaders.c
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@ -201,7 +201,9 @@ const char dither_glsl[] = GLSL(330,
return bayer32;
}
vec4 dither(vec4 c, vec2 coord) {
return vec4(c + bayer(coord) / 255.0);
vec4 residual = mod(c, 1.0 / 255.0);
vec4 dithered = vec4(greaterThan(residual, vec4(1e-4)));
return vec4(c + dithered * bayer(coord) / 255.0);
}
);
const char shadow_colorization_frag[] = GLSL(330,