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780 行
39 KiB
780 行
39 KiB
// Various shadow sampling logic.
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// Again two versions, one for dynamic resource indexing, one for static resource access.
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// ------------------------------------------------------------------
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// PCF Filtering helpers
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// ------------------------------------------------------------------
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// Assuming a isoceles right angled triangle of height "triangleHeight" (as drawn below).
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// This function return the area of the triangle above the first texel.
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//
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// |\ <-- 45 degree slop isosceles right angled triangle
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// | \
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// ---- <-- length of this side is "triangleHeight"
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// _ _ _ _ <-- texels
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real SampleShadow_GetTriangleTexelArea(real triangleHeight)
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{
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return triangleHeight - 0.5;
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}
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// Assuming a isoceles triangle of 1.5 texels height and 3 texels wide lying on 4 texels.
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// This function return the area of the triangle above each of those texels.
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// | <-- offset from -0.5 to 0.5, 0 meaning triangle is exactly in the center
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// / \ <-- 45 degree slop isosceles triangle (ie tent projected in 2D)
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// / \
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// _ _ _ _ <-- texels
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// X Y Z W <-- result indices (in computedArea.xyzw and computedAreaUncut.xyzw)
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void SampleShadow_GetTexelAreas_Tent_3x3(real offset, out real4 computedArea, out real4 computedAreaUncut)
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{
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// Compute the exterior areas
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real offset01SquaredHalved = (offset + 0.5) * (offset + 0.5) * 0.5;
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computedAreaUncut.x = computedArea.x = offset01SquaredHalved - offset;
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computedAreaUncut.w = computedArea.w = offset01SquaredHalved;
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// Compute the middle areas
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// For Y : We find the area in Y of as if the left section of the isoceles triangle would
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// intersect the axis between Y and Z (ie where offset = 0).
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computedAreaUncut.y = SampleShadow_GetTriangleTexelArea(1.5 - offset);
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// This area is superior to the one we are looking for if (offset < 0) thus we need to
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// subtract the area of the triangle defined by (0,1.5-offset), (0,1.5+offset), (-offset,1.5).
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real clampedOffsetLeft = min(offset,0);
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real areaOfSmallLeftTriangle = clampedOffsetLeft * clampedOffsetLeft;
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computedArea.y = computedAreaUncut.y - areaOfSmallLeftTriangle;
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// We do the same for the Z but with the right part of the isoceles triangle
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computedAreaUncut.z = SampleShadow_GetTriangleTexelArea(1.5 + offset);
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real clampedOffsetRight = max(offset,0);
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real areaOfSmallRightTriangle = clampedOffsetRight * clampedOffsetRight;
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computedArea.z = computedAreaUncut.z - areaOfSmallRightTriangle;
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}
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// Assuming a isoceles triangle of 1.5 texels height and 3 texels wide lying on 4 texels.
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// This function return the weight of each texels area relative to the full triangle area.
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void SampleShadow_GetTexelWeights_Tent_3x3(real offset, out real4 computedWeight)
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{
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real4 dummy;
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SampleShadow_GetTexelAreas_Tent_3x3(offset, computedWeight, dummy);
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computedWeight *= 0.44444;//0.44 == 1/(the triangle area)
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}
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// Assuming a isoceles triangle of 2.5 texel height and 5 texels wide lying on 6 texels.
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// This function return the weight of each texels area relative to the full triangle area.
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// / \
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// _ _ _ _ _ _ <-- texels
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// 0 1 2 3 4 5 <-- computed area indices (in texelsWeights[])
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void SampleShadow_GetTexelWeights_Tent_5x5(real offset, out real3 texelsWeightsA, out real3 texelsWeightsB)
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{
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// See _UnityInternalGetAreaPerTexel_3TexelTriangleFilter for details.
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real4 computedArea_From3texelTriangle;
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real4 computedAreaUncut_From3texelTriangle;
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SampleShadow_GetTexelAreas_Tent_3x3(offset, computedArea_From3texelTriangle, computedAreaUncut_From3texelTriangle);
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// Triangle slope is 45 degree thus we can almost reuse the result of the 3 texel wide computation.
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// the 5 texel wide triangle can be seen as the 3 texel wide one but shifted up by one unit/texel.
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// 0.16 is 1/(the triangle area)
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texelsWeightsA.x = 0.16 * (computedArea_From3texelTriangle.x);
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texelsWeightsA.y = 0.16 * (computedAreaUncut_From3texelTriangle.y);
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texelsWeightsA.z = 0.16 * (computedArea_From3texelTriangle.y + 1);
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texelsWeightsB.x = 0.16 * (computedArea_From3texelTriangle.z + 1);
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texelsWeightsB.y = 0.16 * (computedAreaUncut_From3texelTriangle.z);
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texelsWeightsB.z = 0.16 * (computedArea_From3texelTriangle.w);
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}
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// Assuming a isoceles triangle of 3.5 texel height and 7 texels wide lying on 8 texels.
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// This function return the weight of each texels area relative to the full triangle area.
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// / \
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// _ _ _ _ _ _ _ _ <-- texels
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// 0 1 2 3 4 5 6 7 <-- computed area indices (in texelsWeights[])
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void SampleShadow_GetTexelWeights_Tent_7x7(real offset, out real4 texelsWeightsA, out real4 texelsWeightsB)
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{
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// See _UnityInternalGetAreaPerTexel_3TexelTriangleFilter for details.
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real4 computedArea_From3texelTriangle;
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real4 computedAreaUncut_From3texelTriangle;
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SampleShadow_GetTexelAreas_Tent_3x3(offset, computedArea_From3texelTriangle, computedAreaUncut_From3texelTriangle);
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// Triangle slope is 45 degree thus we can almost reuse the result of the 3 texel wide computation.
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// the 7 texel wide triangle can be seen as the 3 texel wide one but shifted up by two unit/texel.
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// 0.081632 is 1/(the triangle area)
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texelsWeightsA.x = 0.081632 * (computedArea_From3texelTriangle.x);
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texelsWeightsA.y = 0.081632 * (computedAreaUncut_From3texelTriangle.y);
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texelsWeightsA.z = 0.081632 * (computedAreaUncut_From3texelTriangle.y + 1);
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texelsWeightsA.w = 0.081632 * (computedArea_From3texelTriangle.y + 2);
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texelsWeightsB.x = 0.081632 * (computedArea_From3texelTriangle.z + 2);
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texelsWeightsB.y = 0.081632 * (computedAreaUncut_From3texelTriangle.z + 1);
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texelsWeightsB.z = 0.081632 * (computedAreaUncut_From3texelTriangle.z);
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texelsWeightsB.w = 0.081632 * (computedArea_From3texelTriangle.w);
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}
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// 3x3 Tent filter (45 degree sloped triangles in U and V)
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void SampleShadow_ComputeSamples_Tent_3x3(real4 shadowMapTexture_TexelSize, real2 coord, out real fetchesWeights[4], out real2 fetchesUV[4])
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{
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// tent base is 3x3 base thus covering from 9 to 12 texels, thus we need 4 bilinear PCF fetches
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real2 tentCenterInTexelSpace = coord.xy * shadowMapTexture_TexelSize.zw;
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real2 centerOfFetchesInTexelSpace = floor(tentCenterInTexelSpace + 0.5);
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real2 offsetFromTentCenterToCenterOfFetches = tentCenterInTexelSpace - centerOfFetchesInTexelSpace;
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// find the weight of each texel based
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real4 texelsWeightsU, texelsWeightsV;
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SampleShadow_GetTexelWeights_Tent_3x3(offsetFromTentCenterToCenterOfFetches.x, texelsWeightsU);
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SampleShadow_GetTexelWeights_Tent_3x3(offsetFromTentCenterToCenterOfFetches.y, texelsWeightsV);
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// each fetch will cover a group of 2x2 texels, the weight of each group is the sum of the weights of the texels
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real2 fetchesWeightsU = texelsWeightsU.xz + texelsWeightsU.yw;
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real2 fetchesWeightsV = texelsWeightsV.xz + texelsWeightsV.yw;
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// move the PCF bilinear fetches to respect texels weights
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real2 fetchesOffsetsU = texelsWeightsU.yw / fetchesWeightsU.xy + real2(-1.5,0.5);
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real2 fetchesOffsetsV = texelsWeightsV.yw / fetchesWeightsV.xy + real2(-1.5,0.5);
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fetchesOffsetsU *= shadowMapTexture_TexelSize.xx;
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fetchesOffsetsV *= shadowMapTexture_TexelSize.yy;
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real2 bilinearFetchOrigin = centerOfFetchesInTexelSpace * shadowMapTexture_TexelSize.xy;
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fetchesUV[0] = bilinearFetchOrigin + real2(fetchesOffsetsU.x, fetchesOffsetsV.x);
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fetchesUV[1] = bilinearFetchOrigin + real2(fetchesOffsetsU.y, fetchesOffsetsV.x);
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fetchesUV[2] = bilinearFetchOrigin + real2(fetchesOffsetsU.x, fetchesOffsetsV.y);
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fetchesUV[3] = bilinearFetchOrigin + real2(fetchesOffsetsU.y, fetchesOffsetsV.y);
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fetchesWeights[0] = fetchesWeightsU.x * fetchesWeightsV.x;
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fetchesWeights[1] = fetchesWeightsU.y * fetchesWeightsV.x;
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fetchesWeights[2] = fetchesWeightsU.x * fetchesWeightsV.y;
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fetchesWeights[3] = fetchesWeightsU.y * fetchesWeightsV.y;
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}
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// 5x5 Tent filter (45 degree sloped triangles in U and V)
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void SampleShadow_ComputeSamples_Tent_5x5(real4 shadowMapTexture_TexelSize, real2 coord, out real fetchesWeights[9], out real2 fetchesUV[9])
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{
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// tent base is 5x5 base thus covering from 25 to 36 texels, thus we need 9 bilinear PCF fetches
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real2 tentCenterInTexelSpace = coord.xy * shadowMapTexture_TexelSize.zw;
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real2 centerOfFetchesInTexelSpace = floor(tentCenterInTexelSpace + 0.5);
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real2 offsetFromTentCenterToCenterOfFetches = tentCenterInTexelSpace - centerOfFetchesInTexelSpace;
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// find the weight of each texel based on the area of a 45 degree slop tent above each of them.
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real3 texelsWeightsU_A, texelsWeightsU_B;
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real3 texelsWeightsV_A, texelsWeightsV_B;
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SampleShadow_GetTexelWeights_Tent_5x5(offsetFromTentCenterToCenterOfFetches.x, texelsWeightsU_A, texelsWeightsU_B);
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SampleShadow_GetTexelWeights_Tent_5x5(offsetFromTentCenterToCenterOfFetches.y, texelsWeightsV_A, texelsWeightsV_B);
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// each fetch will cover a group of 2x2 texels, the weight of each group is the sum of the weights of the texels
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real3 fetchesWeightsU = real3(texelsWeightsU_A.xz, texelsWeightsU_B.y) + real3(texelsWeightsU_A.y, texelsWeightsU_B.xz);
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real3 fetchesWeightsV = real3(texelsWeightsV_A.xz, texelsWeightsV_B.y) + real3(texelsWeightsV_A.y, texelsWeightsV_B.xz);
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// move the PCF bilinear fetches to respect texels weights
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real3 fetchesOffsetsU = real3(texelsWeightsU_A.y, texelsWeightsU_B.xz) / fetchesWeightsU.xyz + real3(-2.5,-0.5,1.5);
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real3 fetchesOffsetsV = real3(texelsWeightsV_A.y, texelsWeightsV_B.xz) / fetchesWeightsV.xyz + real3(-2.5,-0.5,1.5);
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fetchesOffsetsU *= shadowMapTexture_TexelSize.xxx;
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fetchesOffsetsV *= shadowMapTexture_TexelSize.yyy;
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real2 bilinearFetchOrigin = centerOfFetchesInTexelSpace * shadowMapTexture_TexelSize.xy;
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fetchesUV[0] = bilinearFetchOrigin + real2(fetchesOffsetsU.x, fetchesOffsetsV.x);
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fetchesUV[1] = bilinearFetchOrigin + real2(fetchesOffsetsU.y, fetchesOffsetsV.x);
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fetchesUV[2] = bilinearFetchOrigin + real2(fetchesOffsetsU.z, fetchesOffsetsV.x);
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fetchesUV[3] = bilinearFetchOrigin + real2(fetchesOffsetsU.x, fetchesOffsetsV.y);
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fetchesUV[4] = bilinearFetchOrigin + real2(fetchesOffsetsU.y, fetchesOffsetsV.y);
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fetchesUV[5] = bilinearFetchOrigin + real2(fetchesOffsetsU.z, fetchesOffsetsV.y);
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fetchesUV[6] = bilinearFetchOrigin + real2(fetchesOffsetsU.x, fetchesOffsetsV.z);
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fetchesUV[7] = bilinearFetchOrigin + real2(fetchesOffsetsU.y, fetchesOffsetsV.z);
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fetchesUV[8] = bilinearFetchOrigin + real2(fetchesOffsetsU.z, fetchesOffsetsV.z);
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fetchesWeights[0] = fetchesWeightsU.x * fetchesWeightsV.x;
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fetchesWeights[1] = fetchesWeightsU.y * fetchesWeightsV.x;
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fetchesWeights[2] = fetchesWeightsU.z * fetchesWeightsV.x;
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fetchesWeights[3] = fetchesWeightsU.x * fetchesWeightsV.y;
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fetchesWeights[4] = fetchesWeightsU.y * fetchesWeightsV.y;
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fetchesWeights[5] = fetchesWeightsU.z * fetchesWeightsV.y;
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fetchesWeights[6] = fetchesWeightsU.x * fetchesWeightsV.z;
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fetchesWeights[7] = fetchesWeightsU.y * fetchesWeightsV.z;
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fetchesWeights[8] = fetchesWeightsU.z * fetchesWeightsV.z;
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}
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// 7x7 Tent filter (45 degree sloped triangles in U and V)
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void SampleShadow_ComputeSamples_Tent_7x7(real4 shadowMapTexture_TexelSize, real2 coord, out real fetchesWeights[16], out real2 fetchesUV[16])
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{
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// tent base is 7x7 base thus covering from 49 to 64 texels, thus we need 16 bilinear PCF fetches
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real2 tentCenterInTexelSpace = coord.xy * shadowMapTexture_TexelSize.zw;
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real2 centerOfFetchesInTexelSpace = floor(tentCenterInTexelSpace + 0.5);
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real2 offsetFromTentCenterToCenterOfFetches = tentCenterInTexelSpace - centerOfFetchesInTexelSpace;
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// find the weight of each texel based on the area of a 45 degree slop tent above each of them.
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real4 texelsWeightsU_A, texelsWeightsU_B;
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real4 texelsWeightsV_A, texelsWeightsV_B;
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SampleShadow_GetTexelWeights_Tent_7x7(offsetFromTentCenterToCenterOfFetches.x, texelsWeightsU_A, texelsWeightsU_B);
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SampleShadow_GetTexelWeights_Tent_7x7(offsetFromTentCenterToCenterOfFetches.y, texelsWeightsV_A, texelsWeightsV_B);
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// each fetch will cover a group of 2x2 texels, the weight of each group is the sum of the weights of the texels
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real4 fetchesWeightsU = real4(texelsWeightsU_A.xz, texelsWeightsU_B.xz) + real4(texelsWeightsU_A.yw, texelsWeightsU_B.yw);
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real4 fetchesWeightsV = real4(texelsWeightsV_A.xz, texelsWeightsV_B.xz) + real4(texelsWeightsV_A.yw, texelsWeightsV_B.yw);
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// move the PCF bilinear fetches to respect texels weights
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real4 fetchesOffsetsU = real4(texelsWeightsU_A.yw, texelsWeightsU_B.yw) / fetchesWeightsU.xyzw + real4(-3.5,-1.5,0.5,2.5);
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real4 fetchesOffsetsV = real4(texelsWeightsV_A.yw, texelsWeightsV_B.yw) / fetchesWeightsV.xyzw + real4(-3.5,-1.5,0.5,2.5);
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fetchesOffsetsU *= shadowMapTexture_TexelSize.xxxx;
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fetchesOffsetsV *= shadowMapTexture_TexelSize.yyyy;
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real2 bilinearFetchOrigin = centerOfFetchesInTexelSpace * shadowMapTexture_TexelSize.xy;
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fetchesUV[0] = bilinearFetchOrigin + real2(fetchesOffsetsU.x, fetchesOffsetsV.x);
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fetchesUV[1] = bilinearFetchOrigin + real2(fetchesOffsetsU.y, fetchesOffsetsV.x);
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fetchesUV[2] = bilinearFetchOrigin + real2(fetchesOffsetsU.z, fetchesOffsetsV.x);
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fetchesUV[3] = bilinearFetchOrigin + real2(fetchesOffsetsU.w, fetchesOffsetsV.x);
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fetchesUV[4] = bilinearFetchOrigin + real2(fetchesOffsetsU.x, fetchesOffsetsV.y);
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fetchesUV[5] = bilinearFetchOrigin + real2(fetchesOffsetsU.y, fetchesOffsetsV.y);
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fetchesUV[6] = bilinearFetchOrigin + real2(fetchesOffsetsU.z, fetchesOffsetsV.y);
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fetchesUV[7] = bilinearFetchOrigin + real2(fetchesOffsetsU.w, fetchesOffsetsV.y);
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fetchesUV[8] = bilinearFetchOrigin + real2(fetchesOffsetsU.x, fetchesOffsetsV.z);
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fetchesUV[9] = bilinearFetchOrigin + real2(fetchesOffsetsU.y, fetchesOffsetsV.z);
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fetchesUV[10] = bilinearFetchOrigin + real2(fetchesOffsetsU.z, fetchesOffsetsV.z);
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fetchesUV[11] = bilinearFetchOrigin + real2(fetchesOffsetsU.w, fetchesOffsetsV.z);
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fetchesUV[12] = bilinearFetchOrigin + real2(fetchesOffsetsU.x, fetchesOffsetsV.w);
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fetchesUV[13] = bilinearFetchOrigin + real2(fetchesOffsetsU.y, fetchesOffsetsV.w);
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fetchesUV[14] = bilinearFetchOrigin + real2(fetchesOffsetsU.z, fetchesOffsetsV.w);
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fetchesUV[15] = bilinearFetchOrigin + real2(fetchesOffsetsU.w, fetchesOffsetsV.w);
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fetchesWeights[0] = fetchesWeightsU.x * fetchesWeightsV.x;
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fetchesWeights[1] = fetchesWeightsU.y * fetchesWeightsV.x;
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fetchesWeights[2] = fetchesWeightsU.z * fetchesWeightsV.x;
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fetchesWeights[3] = fetchesWeightsU.w * fetchesWeightsV.x;
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fetchesWeights[4] = fetchesWeightsU.x * fetchesWeightsV.y;
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fetchesWeights[5] = fetchesWeightsU.y * fetchesWeightsV.y;
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fetchesWeights[6] = fetchesWeightsU.z * fetchesWeightsV.y;
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fetchesWeights[7] = fetchesWeightsU.w * fetchesWeightsV.y;
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fetchesWeights[8] = fetchesWeightsU.x * fetchesWeightsV.z;
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fetchesWeights[9] = fetchesWeightsU.y * fetchesWeightsV.z;
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fetchesWeights[10] = fetchesWeightsU.z * fetchesWeightsV.z;
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fetchesWeights[11] = fetchesWeightsU.w * fetchesWeightsV.z;
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fetchesWeights[12] = fetchesWeightsU.x * fetchesWeightsV.w;
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fetchesWeights[13] = fetchesWeightsU.y * fetchesWeightsV.w;
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fetchesWeights[14] = fetchesWeightsU.z * fetchesWeightsV.w;
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fetchesWeights[15] = fetchesWeightsU.w * fetchesWeightsV.w;
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}
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// ------------------------------------------------------------------
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// PCF Filtering methods
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// ------------------------------------------------------------------
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//
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// 1 tap PCF sampling
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//
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real SampleShadow_PCF_1tap( ShadowContext shadowContext, inout uint payloadOffset, real3 tcs, uint slice, uint texIdx, uint sampIdx )
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{
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real depthBias = asfloat( shadowContext.payloads[payloadOffset].x );
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payloadOffset++;
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// add the depth bias
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tcs.z += depthBias;
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// sample the texture
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return SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, tcs, slice ).x;
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}
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real SampleShadow_PCF_1tap( ShadowContext shadowContext, inout uint payloadOffset, real3 tcs, uint slice, Texture2DArray tex, SamplerComparisonState compSamp )
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{
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real depthBias = asfloat( shadowContext.payloads[payloadOffset].x );
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payloadOffset++;
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// add the depth bias
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tcs.z += depthBias;
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// sample the texture
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return SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, tcs, slice );
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}
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//
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// 3x3 tent PCF sampling (4 taps)
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//
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real SampleShadow_PCF_Tent_3x3( ShadowContext shadowContext, inout uint payloadOffset, real4 texelSizeRcp, real3 coord, real2 sampleBias, uint slice, uint texIdx, uint sampIdx )
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{
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real2 params = asfloat( shadowContext.payloads[payloadOffset].xy );
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real depthBias = params.x;
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payloadOffset++;
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// TODO move this to shadow data to avoid the rcp?
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real4 shadowMapTexture_TexelSize = real4(texelSizeRcp.xy, rcp(texelSizeRcp.xy));
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// add the depth bias
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coord.z += depthBias;
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real shadow = 0.0;
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real fetchesWeights[4];
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real2 fetchesUV[4];
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SampleShadow_ComputeSamples_Tent_3x3(shadowMapTexture_TexelSize, coord.xy, fetchesWeights, fetchesUV);
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[loop] for (int i = 0; i < 4; i++)
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{
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shadow += fetchesWeights[i] * SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, real3( fetchesUV[i].xy, coord.z + dot( fetchesUV[i].xy - coord.xy, sampleBias ) ), slice ).x;
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}
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return shadow;
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}
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real SampleShadow_PCF_Tent_3x3(ShadowContext shadowContext, inout uint payloadOffset, real4 texelSizeRcp, real3 coord, real2 sampleBias, uint slice, Texture2DArray tex, SamplerComparisonState compSamp )
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{
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real2 params = asfloat( shadowContext.payloads[payloadOffset].xy );
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real depthBias = params.x;
|
|
payloadOffset++;
|
|
|
|
// TODO move this to shadow data to avoid the rcp?
|
|
real4 shadowMapTexture_TexelSize = real4(texelSizeRcp.xy, rcp(texelSizeRcp.xy));
|
|
|
|
// add the depth bias
|
|
coord.z += depthBias;
|
|
|
|
real shadow = 0.0;
|
|
real fetchesWeights[4];
|
|
real2 fetchesUV[4];
|
|
|
|
SampleShadow_ComputeSamples_Tent_3x3(shadowMapTexture_TexelSize, coord.xy, fetchesWeights, fetchesUV);
|
|
for (int i = 0; i < 4; i++)
|
|
{
|
|
shadow += fetchesWeights[i] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[i].xy, coord.z + dot( fetchesUV[i].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
}
|
|
return shadow;
|
|
}
|
|
|
|
//
|
|
// 5x5 tent PCF sampling (9 taps)
|
|
//
|
|
real SampleShadow_PCF_Tent_5x5( ShadowContext shadowContext, inout uint payloadOffset, real4 texelSizeRcp, real3 coord, real2 sampleBias, uint slice, uint texIdx, uint sampIdx )
|
|
{
|
|
real2 params = asfloat( shadowContext.payloads[payloadOffset].xy );
|
|
real depthBias = params.x;
|
|
payloadOffset++;
|
|
|
|
// TODO move this to shadow data to avoid the rcp?
|
|
real4 shadowMapTexture_TexelSize = real4( texelSizeRcp.xy, rcp( texelSizeRcp.xy ) );
|
|
|
|
// add the depth bias
|
|
coord.z += depthBias;
|
|
|
|
real shadow = 0.0;
|
|
real fetchesWeights[9];
|
|
real2 fetchesUV[9];
|
|
|
|
SampleShadow_ComputeSamples_Tent_5x5( shadowMapTexture_TexelSize, coord.xy, fetchesWeights, fetchesUV );
|
|
[loop] for (int i = 0; i < 9; i++)
|
|
{
|
|
shadow += fetchesWeights[i] * SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, real3( fetchesUV[i].xy, coord.z + dot( fetchesUV[i].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
}
|
|
return shadow;
|
|
}
|
|
|
|
real SampleShadow_PCF_Tent_5x5(ShadowContext shadowContext, inout uint payloadOffset, real4 texelSizeRcp, real3 coord, real2 sampleBias, uint slice, Texture2DArray tex, SamplerComparisonState compSamp )
|
|
{
|
|
real2 params = asfloat( shadowContext.payloads[payloadOffset].xy );
|
|
real depthBias = params.x;
|
|
payloadOffset++;
|
|
|
|
// TODO move this to shadow data to avoid the rcp
|
|
real4 shadowMapTexture_TexelSize = real4( texelSizeRcp.xy, rcp(texelSizeRcp.xy ) );
|
|
|
|
// add the depth bias
|
|
coord.z += depthBias;
|
|
|
|
real shadow = 0.0;
|
|
real fetchesWeights[9];
|
|
real2 fetchesUV[9];
|
|
|
|
SampleShadow_ComputeSamples_Tent_5x5( shadowMapTexture_TexelSize, coord.xy, fetchesWeights, fetchesUV );
|
|
|
|
for( int i = 0; i < 9; i++ )
|
|
{
|
|
shadow += fetchesWeights[i] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[i].xy, coord.z + dot( fetchesUV[i].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
}
|
|
|
|
return shadow;
|
|
}
|
|
|
|
//
|
|
// 7x7 tent PCF sampling (16 taps)
|
|
//
|
|
real SampleShadow_PCF_Tent_7x7( ShadowContext shadowContext, inout uint payloadOffset, real4 texelSizeRcp, real3 coord, real2 sampleBias, uint slice, uint texIdx, uint sampIdx )
|
|
{
|
|
real2 params = asfloat( shadowContext.payloads[payloadOffset].xy );
|
|
real depthBias = params.x;
|
|
payloadOffset++;
|
|
|
|
// TODO move this to shadow data to avoid the rcp
|
|
real4 shadowMapTexture_TexelSize = real4( texelSizeRcp.xy, rcp(texelSizeRcp.xy ) );
|
|
|
|
// add the depth bias
|
|
coord.z += depthBias;
|
|
|
|
real shadow = 0.0;
|
|
real fetchesWeights[16];
|
|
real2 fetchesUV[16];
|
|
|
|
SampleShadow_ComputeSamples_Tent_7x7( shadowMapTexture_TexelSize, coord.xy, fetchesWeights, fetchesUV );
|
|
[loop] for (int i = 0; i < 16; i++)
|
|
{
|
|
shadow += fetchesWeights[i] * SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, real3( fetchesUV[i].xy, coord.z + dot( fetchesUV[i].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
}
|
|
|
|
return shadow;
|
|
}
|
|
|
|
real SampleShadow_PCF_Tent_7x7(ShadowContext shadowContext, inout uint payloadOffset, real4 texelSizeRcp, real3 coord, real2 sampleBias, uint slice, Texture2DArray tex, SamplerComparisonState compSamp )
|
|
{
|
|
real2 params = asfloat( shadowContext.payloads[payloadOffset].xy );
|
|
real depthBias = params.x;
|
|
payloadOffset++;
|
|
|
|
// TODO move this to shadow data to avoid the rcp
|
|
real4 shadowMapTexture_TexelSize = real4( texelSizeRcp.xy, rcp( texelSizeRcp.xy ) );
|
|
|
|
// add the depth bias
|
|
coord.z += depthBias;
|
|
|
|
real shadow = 0.0;
|
|
real fetchesWeights[16];
|
|
real2 fetchesUV[16];
|
|
|
|
SampleShadow_ComputeSamples_Tent_7x7( shadowMapTexture_TexelSize, coord.xy, fetchesWeights, fetchesUV );
|
|
|
|
#if SHADOW_OPTIMIZE_REGISTER_USAGE == 1
|
|
// the loops are only there to prevent the compiler form coalescing all 16 texture fetches which increases register usage
|
|
int i;
|
|
[loop]
|
|
for( i = 0; i < 1; i++ )
|
|
{
|
|
shadow += fetchesWeights[ 0] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[ 0].xy, coord.z + dot( fetchesUV[ 0].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
shadow += fetchesWeights[ 1] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[ 1].xy, coord.z + dot( fetchesUV[ 1].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
shadow += fetchesWeights[ 2] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[ 2].xy, coord.z + dot( fetchesUV[ 2].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
shadow += fetchesWeights[ 3] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[ 3].xy, coord.z + dot( fetchesUV[ 3].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
}
|
|
|
|
[loop]
|
|
for( i = 0; i < 1; i++ )
|
|
{
|
|
shadow += fetchesWeights[ 4] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[ 4].xy, coord.z + dot( fetchesUV[ 4].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
shadow += fetchesWeights[ 5] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[ 5].xy, coord.z + dot( fetchesUV[ 5].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
shadow += fetchesWeights[ 6] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[ 6].xy, coord.z + dot( fetchesUV[ 6].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
shadow += fetchesWeights[ 7] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[ 7].xy, coord.z + dot( fetchesUV[ 7].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
}
|
|
[loop]
|
|
for( i = 0; i < 1; i++ )
|
|
{
|
|
shadow += fetchesWeights[ 8] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[ 8].xy, coord.z + dot( fetchesUV[ 8].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
shadow += fetchesWeights[ 9] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[ 9].xy, coord.z + dot( fetchesUV[ 9].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
shadow += fetchesWeights[10] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[10].xy, coord.z + dot( fetchesUV[10].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
shadow += fetchesWeights[11] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[11].xy, coord.z + dot( fetchesUV[11].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
}
|
|
[loop]
|
|
for( i = 0; i < 1; i++ )
|
|
{
|
|
shadow += fetchesWeights[12] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[12].xy, coord.z + dot( fetchesUV[12].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
shadow += fetchesWeights[13] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[13].xy, coord.z + dot( fetchesUV[13].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
shadow += fetchesWeights[14] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[14].xy, coord.z + dot( fetchesUV[14].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
shadow += fetchesWeights[15] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[15].xy, coord.z + dot( fetchesUV[15].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
}
|
|
#else
|
|
for( int i = 0; i < 16; i++ )
|
|
{
|
|
shadow += fetchesWeights[i] * SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( fetchesUV[i].xy, coord.z + dot( fetchesUV[i].xy - coord.xy, sampleBias ) ), slice ).x;
|
|
}
|
|
#endif
|
|
return shadow;
|
|
}
|
|
|
|
//
|
|
// 9 tap adaptive PCF sampling
|
|
//
|
|
real SampleShadow_PCF_9tap_Adaptive( ShadowContext shadowContext, inout uint payloadOffset, real4 texelSizeRcp, real3 tcs, real2 sampleBias, uint slice, uint texIdx, uint sampIdx )
|
|
{
|
|
real2 params = asfloat( shadowContext.payloads[payloadOffset].xy );
|
|
real depthBias = params.x;
|
|
real filterSize = params.y;
|
|
payloadOffset++;
|
|
|
|
texelSizeRcp *= filterSize;
|
|
|
|
// add the depth bias
|
|
tcs.z += depthBias;
|
|
|
|
// Terms0 are weights for the individual samples, the other terms are offsets in texel space
|
|
real4 vShadow3x3PCFTerms0 = real4( 20.0 / 267.0, 33.0 / 267.0, 55.0 / 267.0, 0.0 );
|
|
real4 vShadow3x3PCFTerms1 = real4( texelSizeRcp.x, texelSizeRcp.y, -texelSizeRcp.x, -texelSizeRcp.y );
|
|
real4 vShadow3x3PCFTerms2 = real4( texelSizeRcp.x, texelSizeRcp.y, 0.0, 0.0 );
|
|
real4 vShadow3x3PCFTerms3 = real4(-texelSizeRcp.x, -texelSizeRcp.y, 0.0, 0.0 );
|
|
|
|
real4 v20Taps;
|
|
v20Taps.x = SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, real3( tcs.xy + vShadow3x3PCFTerms1.xy, tcs.z + dot( vShadow3x3PCFTerms1.xy, sampleBias ) ), slice ).x; // 1 1
|
|
v20Taps.y = SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, real3( tcs.xy + vShadow3x3PCFTerms1.zy, tcs.z + dot( vShadow3x3PCFTerms1.zy, sampleBias ) ), slice ).x; // -1 1
|
|
v20Taps.z = SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, real3( tcs.xy + vShadow3x3PCFTerms1.xw, tcs.z + dot( vShadow3x3PCFTerms1.xw, sampleBias ) ), slice ).x; // 1 -1
|
|
v20Taps.w = SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, real3( tcs.xy + vShadow3x3PCFTerms1.zw, tcs.z + dot( vShadow3x3PCFTerms1.zw, sampleBias ) ), slice ).x; // -1 -1
|
|
real flSum = dot( v20Taps.xyzw, real4( 0.25, 0.25, 0.25, 0.25 ) );
|
|
// fully in light or shadow? -> bail
|
|
if( ( flSum == 0.0 ) || ( flSum == 1.0 ) )
|
|
return flSum;
|
|
|
|
// we're in a transition area, do 5 more taps
|
|
flSum *= vShadow3x3PCFTerms0.x * 4.0;
|
|
|
|
real4 v33Taps;
|
|
v33Taps.x = SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, real3( tcs.xy + vShadow3x3PCFTerms2.xz, tcs.z + dot( vShadow3x3PCFTerms2.xz, sampleBias ) ), slice ).x; // 1 0
|
|
v33Taps.y = SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, real3( tcs.xy + vShadow3x3PCFTerms3.xz, tcs.z + dot( vShadow3x3PCFTerms3.xz, sampleBias ) ), slice ).x; // -1 0
|
|
v33Taps.z = SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, real3( tcs.xy + vShadow3x3PCFTerms3.zy, tcs.z + dot( vShadow3x3PCFTerms3.zy, sampleBias ) ), slice ).x; // 0 -1
|
|
v33Taps.w = SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, real3( tcs.xy + vShadow3x3PCFTerms2.zy, tcs.z + dot( vShadow3x3PCFTerms2.zy, sampleBias ) ), slice ).x; // 0 1
|
|
flSum += dot( v33Taps.xyzw, vShadow3x3PCFTerms0.yyyy );
|
|
|
|
flSum += SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, tcs, slice ).x * vShadow3x3PCFTerms0.z;
|
|
|
|
return flSum;
|
|
}
|
|
|
|
real SampleShadow_PCF_9tap_Adaptive(ShadowContext shadowContext, inout uint payloadOffset, real4 texelSizeRcp, real3 tcs, real2 sampleBias, uint slice, Texture2DArray tex, SamplerComparisonState compSamp )
|
|
{
|
|
real2 params = asfloat( shadowContext.payloads[payloadOffset].xy );
|
|
real depthBias = params.x;
|
|
real filterSize = params.y;
|
|
payloadOffset++;
|
|
|
|
texelSizeRcp *= filterSize;
|
|
|
|
// add the depth bias
|
|
tcs.z += depthBias;
|
|
|
|
// Terms0 are weights for the individual samples, the other terms are offsets in texel space
|
|
real4 vShadow3x3PCFTerms0 = real4(20.0 / 267.0, 33.0 / 267.0, 55.0 / 267.0, 0.0);
|
|
real4 vShadow3x3PCFTerms1 = real4( texelSizeRcp.x, texelSizeRcp.y, -texelSizeRcp.x, -texelSizeRcp.y);
|
|
real4 vShadow3x3PCFTerms2 = real4( texelSizeRcp.x, texelSizeRcp.y, 0.0, 0.0);
|
|
real4 vShadow3x3PCFTerms3 = real4(-texelSizeRcp.x, -texelSizeRcp.y, 0.0, 0.0);
|
|
|
|
real4 v20Taps;
|
|
v20Taps.x = SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( tcs.xy + vShadow3x3PCFTerms1.xy, tcs.z + dot( vShadow3x3PCFTerms1.xy, sampleBias ) ), slice ).x; // 1 1
|
|
v20Taps.y = SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( tcs.xy + vShadow3x3PCFTerms1.zy, tcs.z + dot( vShadow3x3PCFTerms1.zy, sampleBias ) ), slice ).x; // -1 1
|
|
v20Taps.z = SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( tcs.xy + vShadow3x3PCFTerms1.xw, tcs.z + dot( vShadow3x3PCFTerms1.xw, sampleBias ) ), slice ).x; // 1 -1
|
|
v20Taps.w = SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( tcs.xy + vShadow3x3PCFTerms1.zw, tcs.z + dot( vShadow3x3PCFTerms1.zw, sampleBias ) ), slice ).x; // -1 -1
|
|
real flSum = dot( v20Taps.xyzw, real4( 0.25, 0.25, 0.25, 0.25 ) );
|
|
// fully in light or shadow? -> bail
|
|
if( ( flSum == 0.0 ) || ( flSum == 1.0 ) )
|
|
return flSum;
|
|
|
|
// we're in a transition area, do 5 more taps
|
|
flSum *= vShadow3x3PCFTerms0.x * 4.0;
|
|
|
|
real4 v33Taps;
|
|
v33Taps.x = SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( tcs.xy + vShadow3x3PCFTerms2.xz, tcs.z + dot( vShadow3x3PCFTerms2.xz, sampleBias ) ), slice ).x; // 1 0
|
|
v33Taps.y = SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( tcs.xy + vShadow3x3PCFTerms3.xz, tcs.z + dot( vShadow3x3PCFTerms3.xz, sampleBias ) ), slice ).x; // -1 0
|
|
v33Taps.z = SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( tcs.xy + vShadow3x3PCFTerms3.zy, tcs.z + dot( vShadow3x3PCFTerms3.zy, sampleBias ) ), slice ).x; // 0 -1
|
|
v33Taps.w = SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, real3( tcs.xy + vShadow3x3PCFTerms2.zy, tcs.z + dot( vShadow3x3PCFTerms2.zy, sampleBias ) ), slice ).x; // 0 1
|
|
flSum += dot( v33Taps.xyzw, vShadow3x3PCFTerms0.yyyy );
|
|
|
|
flSum += SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, tcs, slice ).x * vShadow3x3PCFTerms0.z;
|
|
|
|
return flSum;
|
|
}
|
|
|
|
#include "ShadowMoments.hlsl"
|
|
|
|
//
|
|
// 1 tap VSM sampling
|
|
//
|
|
real SampleShadow_VSM_1tap( ShadowContext shadowContext, inout uint payloadOffset, real3 tcs, uint slice, uint texIdx, uint sampIdx )
|
|
{
|
|
#if UNITY_REVERSED_Z
|
|
real depth = 1.0 - tcs.z;
|
|
#else
|
|
real depth = tcs.z;
|
|
#endif
|
|
real2 params = asfloat( shadowContext.payloads[payloadOffset].xy );
|
|
real lightLeakBias = params.x;
|
|
real varianceBias = params.y;
|
|
payloadOffset++;
|
|
|
|
real2 moments = SampleShadow_T2DA( shadowContext, texIdx, sampIdx, tcs.xy, slice ).xy;
|
|
|
|
return ShadowMoments_ChebyshevsInequality( moments, depth, varianceBias, lightLeakBias );
|
|
}
|
|
|
|
real SampleShadow_VSM_1tap(ShadowContext shadowContext, inout uint payloadOffset, real3 tcs, uint slice, Texture2DArray tex, SamplerState samp )
|
|
{
|
|
#if UNITY_REVERSED_Z
|
|
real depth = 1.0 - tcs.z;
|
|
#else
|
|
real depth = tcs.z;
|
|
#endif
|
|
real2 params = asfloat( shadowContext.payloads[payloadOffset].xy );
|
|
real lightLeakBias = params.x;
|
|
real varianceBias = params.y;
|
|
payloadOffset++;
|
|
|
|
real2 moments = SAMPLE_TEXTURE2D_ARRAY_LOD( tex, samp, tcs.xy, slice, 0.0 ).xy;
|
|
|
|
return ShadowMoments_ChebyshevsInequality( moments, depth, varianceBias, lightLeakBias );
|
|
}
|
|
|
|
//
|
|
// 1 tap EVSM sampling
|
|
//
|
|
real SampleShadow_EVSM_1tap( ShadowContext shadowContext, inout uint payloadOffset, real3 tcs, uint slice, uint texIdx, uint sampIdx, bool fourMoments )
|
|
{
|
|
#if UNITY_REVERSED_Z
|
|
real depth = 1.0 - tcs.z;
|
|
#else
|
|
real depth = tcs.z;
|
|
#endif
|
|
real4 params = asfloat( shadowContext.payloads[payloadOffset] );
|
|
real lightLeakBias = params.x;
|
|
real varianceBias = params.y;
|
|
real2 evsmExponents = params.zw;
|
|
payloadOffset++;
|
|
|
|
real2 warpedDepth = ShadowMoments_WarpDepth( depth, evsmExponents );
|
|
|
|
real4 moments = SampleShadow_T2DA( shadowContext, texIdx, sampIdx, tcs.xy, slice );
|
|
|
|
// Derivate of warping at depth
|
|
real2 depthScale = evsmExponents * warpedDepth;
|
|
real2 minVariance = depthScale * depthScale * varianceBias;
|
|
|
|
[branch]
|
|
if( fourMoments )
|
|
{
|
|
real posContrib = ShadowMoments_ChebyshevsInequality( moments.xz, warpedDepth.x, minVariance.x, lightLeakBias );
|
|
real negContrib = ShadowMoments_ChebyshevsInequality( moments.yw, warpedDepth.y, minVariance.y, lightLeakBias );
|
|
return min( posContrib, negContrib );
|
|
}
|
|
else
|
|
{
|
|
return ShadowMoments_ChebyshevsInequality( moments.xy, warpedDepth.x, minVariance.x, lightLeakBias );
|
|
}
|
|
}
|
|
|
|
real SampleShadow_EVSM_1tap( ShadowContext shadowContext, inout uint payloadOffset, real3 tcs, uint slice, Texture2DArray tex, SamplerState samp, bool fourMoments )
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{
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#if UNITY_REVERSED_Z
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real depth = 1.0 - tcs.z;
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#else
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real depth = tcs.z;
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#endif
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real4 params = asfloat( shadowContext.payloads[payloadOffset] );
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real lightLeakBias = params.x;
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real varianceBias = params.y;
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real2 evsmExponents = params.zw;
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payloadOffset++;
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real2 warpedDepth = ShadowMoments_WarpDepth( depth, evsmExponents );
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real4 moments = SAMPLE_TEXTURE2D_ARRAY_LOD( tex, samp, tcs.xy, slice, 0.0 );
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// Derivate of warping at depth
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real2 depthScale = evsmExponents * warpedDepth;
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real2 minVariance = depthScale * depthScale * varianceBias;
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[branch]
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if( fourMoments )
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{
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real posContrib = ShadowMoments_ChebyshevsInequality( moments.xz, warpedDepth.x, minVariance.x, lightLeakBias );
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real negContrib = ShadowMoments_ChebyshevsInequality( moments.yw, warpedDepth.y, minVariance.y, lightLeakBias );
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return min( posContrib, negContrib );
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}
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else
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{
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return ShadowMoments_ChebyshevsInequality( moments.xy, warpedDepth.x, minVariance.x, lightLeakBias );
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}
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}
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//
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// 1 tap MSM sampling
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//
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real SampleShadow_MSM_1tap( ShadowContext shadowContext, inout uint payloadOffset, real3 tcs, uint slice, uint texIdx, uint sampIdx, bool useHamburger )
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{
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real4 params = asfloat( shadowContext.payloads[payloadOffset] );
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real lightLeakBias = params.x;
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real momentBias = params.y;
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real depthBias = params.z;
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real bpp16 = params.w;
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#if UNITY_REVERSED_Z
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real depth = (1.0 - tcs.z) - depthBias;
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#else
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real depth = tcs.z + depthBias;
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#endif
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payloadOffset++;
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real4 moments = SampleShadow_T2DA( shadowContext, texIdx, sampIdx, tcs.xy, slice );
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if( bpp16 != 0.0 )
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moments = ShadowMoments_Decode16MSM( moments );
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real3 z;
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real4 b;
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ShadowMoments_SolveMSM( moments, depth, momentBias, z, b );
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if( useHamburger )
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return ShadowMoments_SolveDelta3MSM( z, b.xy, lightLeakBias );
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else
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return (z[1] < 0.0 || z[2] > 1.0) ? ShadowMoments_SolveDelta4MSM( z, b, lightLeakBias ) : ShadowMoments_SolveDelta3MSM( z, b.xy, lightLeakBias );
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}
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real SampleShadow_MSM_1tap( ShadowContext shadowContext, inout uint payloadOffset, real3 tcs, uint slice, Texture2DArray tex, SamplerState samp, bool useHamburger )
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{
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real4 params = asfloat( shadowContext.payloads[payloadOffset] );
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real lightLeakBias = params.x;
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real momentBias = params.y;
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real depthBias = params.z;
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real bpp16 = params.w;
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#if UNITY_REVERSED_Z
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real depth = (1.0 - tcs.z) - depthBias;
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#else
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real depth = tcs.z + depthBias;
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#endif
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payloadOffset++;
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|
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real4 moments = SAMPLE_TEXTURE2D_ARRAY_LOD( tex, samp, tcs.xy, slice, 0.0 );
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if( bpp16 != 0.0 )
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moments = ShadowMoments_Decode16MSM( moments );
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real3 z;
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real4 b;
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ShadowMoments_SolveMSM( moments, depth, momentBias, z, b );
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|
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if( useHamburger )
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return ShadowMoments_SolveDelta3MSM( z, b.xy, lightLeakBias );
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else
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return (z[1] < 0.0 || z[2] > 1.0) ? ShadowMoments_SolveDelta4MSM( z, b, lightLeakBias ) : ShadowMoments_SolveDelta3MSM( z, b.xy, lightLeakBias );
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}
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//-----------------------------------------------------------------------------------------------------
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// helper function to dispatch a specific shadow algorithm
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real SampleShadow_SelectAlgorithm( ShadowContext shadowContext, ShadowData shadowData, inout uint payloadOffset, real3 posTC, real2 sampleBias, uint slice, uint algorithm, uint texIdx, uint sampIdx )
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|
{
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|
[branch]
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|
switch( algorithm )
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|
{
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case GPUSHADOWALGORITHM_PCF_1TAP : return SampleShadow_PCF_1tap( shadowContext, payloadOffset, posTC, slice, texIdx, sampIdx );
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case GPUSHADOWALGORITHM_PCF_9TAP : return SampleShadow_PCF_9tap_Adaptive( shadowContext, payloadOffset, shadowData.texelSizeRcp, posTC, sampleBias, slice, texIdx, sampIdx );
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case GPUSHADOWALGORITHM_PCF_TENT_3X3 : return SampleShadow_PCF_Tent_3x3( shadowContext, payloadOffset, shadowData.texelSizeRcp, posTC, sampleBias, slice, texIdx, sampIdx );
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|
case GPUSHADOWALGORITHM_PCF_TENT_5X5 : return SampleShadow_PCF_Tent_5x5( shadowContext, payloadOffset, shadowData.texelSizeRcp, posTC, sampleBias, slice, texIdx, sampIdx );
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|
case GPUSHADOWALGORITHM_PCF_TENT_7X7 : return SampleShadow_PCF_Tent_7x7( shadowContext, payloadOffset, shadowData.texelSizeRcp, posTC, sampleBias, slice, texIdx, sampIdx );
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case GPUSHADOWALGORITHM_VSM : return SampleShadow_VSM_1tap( shadowContext, payloadOffset, posTC, slice, texIdx, sampIdx );
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case GPUSHADOWALGORITHM_EVSM_2 : return SampleShadow_EVSM_1tap( shadowContext, payloadOffset, posTC, slice, texIdx, sampIdx, false );
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case GPUSHADOWALGORITHM_EVSM_4 : return SampleShadow_EVSM_1tap( shadowContext, payloadOffset, posTC, slice, texIdx, sampIdx, true );
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case GPUSHADOWALGORITHM_MSM_HAM : return SampleShadow_MSM_1tap( shadowContext, payloadOffset, posTC, slice, texIdx, sampIdx, true );
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|
case GPUSHADOWALGORITHM_MSM_HAUS : return SampleShadow_MSM_1tap( shadowContext, payloadOffset, posTC, slice, texIdx, sampIdx, false );
|
|
default: return 1.0;
|
|
}
|
|
}
|
|
|
|
real SampleShadow_SelectAlgorithm( ShadowContext shadowContext, ShadowData shadowData, inout uint payloadOffset, real3 posTC, real2 sampleBias, uint slice, uint algorithm, Texture2DArray tex, SamplerComparisonState compSamp )
|
|
{
|
|
[branch]
|
|
switch( algorithm )
|
|
{
|
|
case GPUSHADOWALGORITHM_PCF_1TAP : return SampleShadow_PCF_1tap( shadowContext, payloadOffset, posTC, slice, tex, compSamp );
|
|
case GPUSHADOWALGORITHM_PCF_9TAP : return SampleShadow_PCF_9tap_Adaptive( shadowContext, payloadOffset, shadowData.texelSizeRcp, posTC, sampleBias, slice, tex, compSamp );
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|
case GPUSHADOWALGORITHM_PCF_TENT_3X3 : return SampleShadow_PCF_Tent_3x3( shadowContext, payloadOffset, shadowData.texelSizeRcp, posTC, sampleBias, slice, tex, compSamp );
|
|
case GPUSHADOWALGORITHM_PCF_TENT_5X5 : return SampleShadow_PCF_Tent_5x5( shadowContext, payloadOffset, shadowData.texelSizeRcp, posTC, sampleBias, slice, tex, compSamp );
|
|
case GPUSHADOWALGORITHM_PCF_TENT_7X7 : return SampleShadow_PCF_Tent_7x7( shadowContext, payloadOffset, shadowData.texelSizeRcp, posTC, sampleBias, slice, tex, compSamp );
|
|
|
|
default: return 1.0;
|
|
}
|
|
}
|
|
|
|
real SampleShadow_SelectAlgorithm( ShadowContext shadowContext, ShadowData shadowData, inout uint payloadOffset, real3 posTC, real2 sampleBias, uint slice, uint algorithm, Texture2DArray tex, SamplerState samp )
|
|
{
|
|
[branch]
|
|
switch( algorithm )
|
|
{
|
|
case GPUSHADOWALGORITHM_VSM : return SampleShadow_VSM_1tap( shadowContext, payloadOffset, posTC, slice, tex, samp );
|
|
case GPUSHADOWALGORITHM_EVSM_2 : return SampleShadow_EVSM_1tap( shadowContext, payloadOffset, posTC, slice, tex, samp, false );
|
|
case GPUSHADOWALGORITHM_EVSM_4 : return SampleShadow_EVSM_1tap( shadowContext, payloadOffset, posTC, slice, tex, samp, true );
|
|
case GPUSHADOWALGORITHM_MSM_HAM : return SampleShadow_MSM_1tap( shadowContext, payloadOffset, posTC, slice, tex, samp, true );
|
|
case GPUSHADOWALGORITHM_MSM_HAUS : return SampleShadow_MSM_1tap( shadowContext, payloadOffset, posTC, slice, tex, samp, false );
|
|
default: return 1.0;
|
|
}
|
|
}
|