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- expand the dither matrix from 4x4 to 8x8

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Rachael Alexanderson 2018-08-06 23:00:20 -04:00
parent 0cfe79d85d
commit 1cfed9de45
1 changed files with 20 additions and 8 deletions
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28
wadsrc/static/shaders/glsl/present.fp
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@ -17,18 +17,30 @@ vec4 ApplyGamma(vec4 c)
return vec4(val, c.a);
}
float halfstep = 1./32.;
float DitherMatrix[16] = float[](
0.0 / 16.0 + halfstep, 8.0 / 16.0 + halfstep, 2.0 / 16.0 + halfstep, 10.0 / 16.0 + halfstep,
12.0 / 16.0 + halfstep, 4.0 / 16.0 + halfstep, 14.0 / 16.0 + halfstep, 6.0 / 16.0 + halfstep,
3.0 / 16.0 + halfstep, 11.0 / 16.0 + halfstep, 1.0 / 16.0 + halfstep, 9.0 / 16.0 + halfstep,
15.0 / 16.0 + halfstep, 7.0 / 16.0 + halfstep, 13.0 / 16.0 + halfstep, 5.0 / 16.0 + halfstep
float halfstep = 1./65.;
float DitherMatrix[64] = float[](
0.0 / 16.0 + halfstep * 1, 8.0 / 16.0 + halfstep * 1, 2.0 / 16.0 + halfstep * 1, 10.0 / 16.0 + halfstep * 1,
0.0 / 16.0 + halfstep * 3, 8.0 / 16.0 + halfstep * 3, 2.0 / 16.0 + halfstep * 3, 10.0 / 16.0 + halfstep * 3,
12.0 / 16.0 + halfstep * 1, 4.0 / 16.0 + halfstep * 1, 14.0 / 16.0 + halfstep * 1, 6.0 / 16.0 + halfstep * 1,
12.0 / 16.0 + halfstep * 3, 4.0 / 16.0 + halfstep * 3, 14.0 / 16.0 + halfstep * 3, 6.0 / 16.0 + halfstep * 3,
3.0 / 16.0 + halfstep * 1, 11.0 / 16.0 + halfstep * 1, 1.0 / 16.0 + halfstep * 1, 9.0 / 16.0 + halfstep * 1,
3.0 / 16.0 + halfstep * 3, 11.0 / 16.0 + halfstep * 3, 1.0 / 16.0 + halfstep * 3, 9.0 / 16.0 + halfstep * 3,
15.0 / 16.0 + halfstep * 1, 7.0 / 16.0 + halfstep * 1, 13.0 / 16.0 + halfstep * 1, 5.0 / 16.0 + halfstep * 1,
15.0 / 16.0 + halfstep * 3, 7.0 / 16.0 + halfstep * 3, 13.0 / 16.0 + halfstep * 3, 5.0 / 16.0 + halfstep * 3,
0.0 / 16.0 + halfstep * 4, 8.0 / 16.0 + halfstep * 4, 2.0 / 16.0 + halfstep * 4, 10.0 / 16.0 + halfstep * 4,
0.0 / 16.0 + halfstep * 2, 8.0 / 16.0 + halfstep * 2, 2.0 / 16.0 + halfstep * 2, 10.0 / 16.0 + halfstep * 2,
12.0 / 16.0 + halfstep * 4, 4.0 / 16.0 + halfstep * 4, 14.0 / 16.0 + halfstep * 4, 6.0 / 16.0 + halfstep * 4,
12.0 / 16.0 + halfstep * 2, 4.0 / 16.0 + halfstep * 2, 14.0 / 16.0 + halfstep * 2, 6.0 / 16.0 + halfstep * 2,
3.0 / 16.0 + halfstep * 4, 11.0 / 16.0 + halfstep * 4, 1.0 / 16.0 + halfstep * 4, 9.0 / 16.0 + halfstep * 4,
3.0 / 16.0 + halfstep * 2, 11.0 / 16.0 + halfstep * 2, 1.0 / 16.0 + halfstep * 2, 9.0 / 16.0 + halfstep * 2,
15.0 / 16.0 + halfstep * 4, 7.0 / 16.0 + halfstep * 4, 13.0 / 16.0 + halfstep * 4, 5.0 / 16.0 + halfstep * 4,
15.0 / 16.0 + halfstep * 2, 7.0 / 16.0 + halfstep * 2, 13.0 / 16.0 + halfstep * 2, 5.0 / 16.0 + halfstep * 2
);
vec4 Dither(vec4 c, float colorscale)
{
ivec2 pos = ivec2(gl_FragCoord.xy) & 3;
float threshold = DitherMatrix[pos.x + (pos.y << 2)];
ivec2 pos = ivec2(gl_FragCoord.xy) & 7;
float threshold = DitherMatrix[pos.x + (pos.y << 3)];
return vec4(floor(c.rgb * colorscale + threshold) / colorscale, c.a);
}