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Compact PCF shadow sampling code

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This commit is contained in:
Wojciech Figat
2026-05-05 08:47:57 +02:00
parent aac399c6a1
commit fad0f7a345
1 changed files with 29 additions and 35 deletions
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Source/Shaders/ShadowsSampling.hlsl
+29 -35
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@@ -89,12 +89,6 @@ float SampleShadowMap(Texture2D<float> shadowMap, float2 shadowMapUV, float scen
return result;
}
float SampleShadowMapOptimizedPCFHelper(Texture2D<float> shadowMap, float2 baseUV, float u, float v, float2 shadowMapSizeInv, float sceneDepth)
{
float2 uv = baseUV + float2(u, v) * shadowMapSizeInv;
return SAMPLE_SHADOW_MAP(shadowMap, uv, sceneDepth);
}
// [Shadow map sampling method used in The Witness, https://github.com/TheRealMJP/Shadows]
float SampleShadowMapOptimizedPCF(Texture2D<float> shadowMap, float2 shadowMapUV, float sceneDepth)
{
@@ -130,10 +124,10 @@ float SampleShadowMapOptimizedPCF(Texture2D<float> shadowMap, float2 shadowMapUV
float v0 = (2 - t) / vw0 - 1;
float v1 = t / vw1 + 1;
sum += uw0 * vw0 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u0, v0, shadowMapSizeInv, sceneDepth);
sum += uw1 * vw0 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u1, v0, shadowMapSizeInv, sceneDepth);
sum += uw0 * vw1 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u0, v1, shadowMapSizeInv, sceneDepth);
sum += uw1 * vw1 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u1, v1, shadowMapSizeInv, sceneDepth);
sum += uw0 * vw0 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u0, v0) * shadowMapSizeInv, sceneDepth);
sum += uw1 * vw0 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u1, v0) * shadowMapSizeInv, sceneDepth);
sum += uw0 * vw1 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u0, v1) * shadowMapSizeInv, sceneDepth);
sum += uw1 * vw1 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u1, v1) * shadowMapSizeInv, sceneDepth);
return sum * 1.0f / 16;
#elif SHADOWS_QUALITY == 2
@@ -153,17 +147,17 @@ float SampleShadowMapOptimizedPCF(Texture2D<float> shadowMap, float2 shadowMapUV
float v1 = (3 + t) / vw1;
float v2 = t / vw2 + 2;
sum += uw0 * vw0 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u0, v0, shadowMapSizeInv, sceneDepth);
sum += uw1 * vw0 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u1, v0, shadowMapSizeInv, sceneDepth);
sum += uw2 * vw0 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u2, v0, shadowMapSizeInv, sceneDepth);
sum += uw0 * vw0 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u0, v0) * shadowMapSizeInv, sceneDepth);
sum += uw1 * vw0 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u1, v0) * shadowMapSizeInv, sceneDepth);
sum += uw2 * vw0 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u2, v0) * shadowMapSizeInv, sceneDepth);
sum += uw0 * vw1 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u0, v1, shadowMapSizeInv, sceneDepth);
sum += uw1 * vw1 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u1, v1, shadowMapSizeInv, sceneDepth);
sum += uw2 * vw1 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u2, v1, shadowMapSizeInv, sceneDepth);
sum += uw0 * vw1 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u0, v1) * shadowMapSizeInv, sceneDepth);
sum += uw1 * vw1 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u1, v1) * shadowMapSizeInv, sceneDepth);
sum += uw2 * vw1 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u2, v1) * shadowMapSizeInv, sceneDepth);
sum += uw0 * vw2 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u0, v2, shadowMapSizeInv, sceneDepth);
sum += uw1 * vw2 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u1, v2, shadowMapSizeInv, sceneDepth);
sum += uw2 * vw2 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u2, v2, shadowMapSizeInv, sceneDepth);
sum += uw0 * vw2 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u0, v2) * shadowMapSizeInv, sceneDepth);
sum += uw1 * vw2 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u1, v2) * shadowMapSizeInv, sceneDepth);
sum += uw2 * vw2 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u2, v2) * shadowMapSizeInv, sceneDepth);
return sum * 1.0f / 144;
#elif SHADOWS_QUALITY == 3
@@ -187,25 +181,25 @@ float SampleShadowMapOptimizedPCF(Texture2D<float> shadowMap, float2 shadowMapUV
float v2 = -(7 * t + 5) / vw2 + 1;
float v3 = -t / vw3 + 3;
sum += uw0 * vw0 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u0, v0, shadowMapSizeInv, sceneDepth);
sum += uw1 * vw0 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u1, v0, shadowMapSizeInv, sceneDepth);
sum += uw2 * vw0 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u2, v0, shadowMapSizeInv, sceneDepth);
sum += uw3 * vw0 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u3, v0, shadowMapSizeInv, sceneDepth);
sum += uw0 * vw0 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u0, v0) * shadowMapSizeInv, sceneDepth);
sum += uw1 * vw0 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u1, v0) * shadowMapSizeInv, sceneDepth);
sum += uw2 * vw0 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u2, v0) * shadowMapSizeInv, sceneDepth);
sum += uw3 * vw0 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u3, v0) * shadowMapSizeInv, sceneDepth);
sum += uw0 * vw1 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u0, v1, shadowMapSizeInv, sceneDepth);
sum += uw1 * vw1 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u1, v1, shadowMapSizeInv, sceneDepth);
sum += uw2 * vw1 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u2, v1, shadowMapSizeInv, sceneDepth);
sum += uw3 * vw1 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u3, v1, shadowMapSizeInv, sceneDepth);
sum += uw0 * vw1 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u0, v1) * shadowMapSizeInv, sceneDepth);
sum += uw1 * vw1 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u1, v1) * shadowMapSizeInv, sceneDepth);
sum += uw2 * vw1 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u2, v1) * shadowMapSizeInv, sceneDepth);
sum += uw3 * vw1 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u3, v1) * shadowMapSizeInv, sceneDepth);
sum += uw0 * vw2 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u0, v2, shadowMapSizeInv, sceneDepth);
sum += uw1 * vw2 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u1, v2, shadowMapSizeInv, sceneDepth);
sum += uw2 * vw2 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u2, v2, shadowMapSizeInv, sceneDepth);
sum += uw3 * vw2 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u3, v2, shadowMapSizeInv, sceneDepth);
sum += uw0 * vw2 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u0, v2) * shadowMapSizeInv, sceneDepth);
sum += uw1 * vw2 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u1, v2) * shadowMapSizeInv, sceneDepth);
sum += uw2 * vw2 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u2, v2) * shadowMapSizeInv, sceneDepth);
sum += uw3 * vw2 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u3, v2) * shadowMapSizeInv, sceneDepth);
sum += uw0 * vw3 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u0, v3, shadowMapSizeInv, sceneDepth);
sum += uw1 * vw3 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u1, v3, shadowMapSizeInv, sceneDepth);
sum += uw2 * vw3 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u2, v3, shadowMapSizeInv, sceneDepth);
sum += uw3 * vw3 * SampleShadowMapOptimizedPCFHelper(shadowMap, baseUV, u3, v3, shadowMapSizeInv, sceneDepth);
sum += uw0 * vw3 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u0, v3) * shadowMapSizeInv, sceneDepth);
sum += uw1 * vw3 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u1, v3) * shadowMapSizeInv, sceneDepth);
sum += uw2 * vw3 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u2, v3) * shadowMapSizeInv, sceneDepth);
sum += uw3 * vw3 * SAMPLE_SHADOW_MAP(shadowMap, baseUV + float2(u3, v3) * shadowMapSizeInv, sceneDepth);
return sum * (1.0f / 2704);
#else