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52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
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#define FIXED_BIAS 0.0003
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float depthShadowPCF (shTexture2D shadowMap, float4 shadowMapPos, float2 offset)
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{
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shadowMapPos /= shadowMapPos.w;
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float3 o = float3(offset.xy, -offset.x) * 0.3;
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//float3 o = float3(0,0,0);
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float c = (shadowMapPos.z <= FIXED_BIAS + shSample(shadowMap, shadowMapPos.xy - o.xy).r) ? 1.0 : 0.0; // top left
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c += (shadowMapPos.z <= FIXED_BIAS + shSample(shadowMap, shadowMapPos.xy + o.xy).r) ? 1.0 : 0.0; // bottom right
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c += (shadowMapPos.z <= FIXED_BIAS + shSample(shadowMap, shadowMapPos.xy + o.zy).r) ? 1.0 : 0.0; // bottom left
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c += (shadowMapPos.z <= FIXED_BIAS + shSample(shadowMap, shadowMapPos.xy - o.zy).r) ? 1.0 : 0.0; // top right
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return c / 4.0;
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}
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float pssmDepthShadow (
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float4 lightSpacePos0,
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float2 invShadowmapSize0,
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shTexture2D shadowMap0,
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float4 lightSpacePos1,
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float2 invShadowmapSize1,
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shTexture2D shadowMap1,
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float4 lightSpacePos2,
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float2 invShadowmapSize2,
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shTexture2D shadowMap2,
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float depth,
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float3 pssmSplitPoints)
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{
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float shadow;
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float pcf1 = depthShadowPCF(shadowMap0, lightSpacePos0, invShadowmapSize0);
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float pcf2 = depthShadowPCF(shadowMap1, lightSpacePos1, invShadowmapSize1);
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float pcf3 = depthShadowPCF(shadowMap2, lightSpacePos2, invShadowmapSize2);
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if (depth < pssmSplitPoints.x)
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shadow = pcf1;
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else if (depth < pssmSplitPoints.y)
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shadow = pcf2;
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else
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shadow = pcf3;
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return shadow;
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}
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