54 lines
2.4 KiB
Plaintext
54 lines
2.4 KiB
Plaintext
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Texture2D<float> In_BaseMaskTex;
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Texture2D<float> In_HeightTex;
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Texture2D<float> RemapTex;
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RWTexture2D<float> OutputTex;
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float EffectStrength;
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int RemapTexRes;
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float4 TextureResolution;
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float2 gradient(uint2 id, uint2 offset) {
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uint upY = max(0, id.y - offset.y);
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uint downY = min((uint)TextureResolution.y, id.y + offset.y);
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uint rightX = max(0, id.x - offset.x);
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uint leftX = min((uint)TextureResolution.x, id.x + offset.x);
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//don't need to divide by 8.0f, since we are normalizing
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float dzdx = ((In_HeightTex[uint2(rightX, upY)] + 2 * In_HeightTex[uint2(rightX, id.y)] + In_HeightTex[uint2(rightX, downY)]) -
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(In_HeightTex[uint2(leftX, upY)] + 2 * In_HeightTex[uint2(leftX, id.y)] + In_HeightTex[uint2(leftX, downY)])) / 8.0f;
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float dzdy = ((In_HeightTex[uint2(leftX, downY)] + 2 * In_HeightTex[uint2(id.x, downY)] + In_HeightTex[uint2(rightX, downY)]) -
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(In_HeightTex[uint2(leftX, upY)] + 2 * In_HeightTex[uint2(id.x, upY)] + In_HeightTex[uint2(rightX, upY)])) / 8.0f;
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float mag = length(float2(dzdx, dzdy));
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return float2(dzdx, dzdy) / mag;
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}
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#pragma kernel ConcavityMultiply
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[numthreads(1, 1, 1)]
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void ConcavityMultiply(uint3 id : SV_DispatchThreadID)
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{
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uint2 offset = uint2(TextureResolution.zz);
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uint upY = max(0, id.y - offset.x);
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uint downY = min((uint)TextureResolution.y, id.y + offset.y);
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uint rightX = max(0, id.x - offset.x);
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uint leftX = min((uint)TextureResolution.x, id.x + offset.y);
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/*
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float dgdx = gradient(uint2(rightX, id.y), offset).x - gradient(uint2(leftX, id.y), offset).x;
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float dgdy = gradient(uint2(id.x, downY), offset).y - gradient(uint2(id.x, upY), offset).y;
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*/
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float dgdx = ((gradient(uint2(rightX, upY), offset).x + 2 * gradient(uint2(rightX, id.y), offset).x + gradient(uint2(rightX, downY), offset).x) -
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(gradient(uint2(leftX, upY), offset).x + 2 * gradient(uint2(leftX, id.y), offset).x + gradient(uint2(leftX, downY), offset).x)) / 8.0f;
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float dgdy = ((gradient(uint2(leftX, downY), offset).y + 2 * gradient(uint2(id.x, downY), offset).y + gradient(uint2(rightX, downY), offset).y) -
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(gradient(uint2(leftX, upY), offset).y + 2 * gradient(uint2(id.x, upY), offset).y + gradient(uint2(rightX, upY), offset).y)) / 8.0f;
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float laplace = saturate(TextureResolution.w * (dgdx + dgdy) / 2.0f);
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uint remapIdx = (uint)(laplace * (float)(RemapTexRes - 1));
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float remappedLaplace = RemapTex[uint2(remapIdx, 0)];
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OutputTex[id.xy] = lerp(1.0f, remappedLaplace, EffectStrength) * In_BaseMaskTex[id.xy];
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}
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