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shader tweak for LUT application
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Aiden
2026-05-06 16:53:54 +10:00
parent f9ea2d6900
commit cea435b609
3 changed files with 42 additions and 8 deletions
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37
shaders/lut-apply/shader.slang
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@@ -30,13 +30,35 @@ float3 applyLut33(float3 color)
float3 c011 = sampleLutCell(float3(baseIndex.r, nextIndex.g, nextIndex.b));
float3 c111 = sampleLutCell(float3(nextIndex.r, nextIndex.g, nextIndex.b));
float3 c00 = lerp(c000, c100, blend.r);
float3 c10 = lerp(c010, c110, blend.r);
float3 c01 = lerp(c001, c101, blend.r);
float3 c11 = lerp(c011, c111, blend.r);
float3 c0 = lerp(c00, c10, blend.g);
float3 c1 = lerp(c01, c11, blend.g);
return lerp(c0, c1, blend.b);
if (blend.r > blend.g)
{
if (blend.g > blend.b)
return c000 + blend.r * (c100 - c000) + blend.g * (c110 - c100) + blend.b * (c111 - c110);
if (blend.r > blend.b)
return c000 + blend.r * (c100 - c000) + blend.b * (c101 - c100) + blend.g * (c111 - c101);
return c000 + blend.b * (c001 - c000) + blend.r * (c101 - c001) + blend.g * (c111 - c101);
}
if (blend.b > blend.g)
return c000 + blend.b * (c001 - c000) + blend.g * (c011 - c001) + blend.r * (c111 - c011);
if (blend.b > blend.r)
return c000 + blend.g * (c010 - c000) + blend.b * (c011 - c010) + blend.r * (c111 - c011);
return c000 + blend.g * (c010 - c000) + blend.r * (c110 - c010) + blend.b * (c111 - c110);
}
float hash12(float2 value)
{
float3 p = frac(float3(value.xyx) * 0.1031);
p += dot(p, p.yzx + 33.33);
return frac((p.x + p.y) * p.z);
}
float3 outputDither(float2 pixel)
{
float r = hash12(pixel + float2(17.0, 31.0)) - hash12(pixel + float2(83.0, 47.0));
float g = hash12(pixel + float2(29.0, 71.0)) - hash12(pixel + float2(53.0, 19.0));
float b = hash12(pixel + float2(61.0, 11.0)) - hash12(pixel + float2(7.0, 97.0));
return float3(r, g, b) / 255.0;
}
float4 shadeVideo(ShaderContext context)
@@ -49,6 +71,7 @@ float4 shadeVideo(ShaderContext context)
float3 lutColor = applyLut33(inputColor);
float3 graded = lerp(inputColor, lutColor, lutStrength);
graded = (graded - 0.5) * postContrast + 0.5;
graded += outputDither(context.uv * context.outputResolution) * ditherAmount;
return float4(saturate(graded), source.a);
}