43 lines
1.4 KiB
Plaintext
43 lines
1.4 KiB
Plaintext
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Texture2D<float> In_HeightTex;
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Texture2D<float> In_BaseMaskTex;
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Texture2D<float> RemapTex;
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RWTexture2D<float> OutputTex;
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float4 AspectValues;
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float EffectStrength;
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int RemapTexRes;
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float2 computeNormal(uint2 id, int epsilon)
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{
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uint left = id.x - epsilon;
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uint right = id.x + epsilon;
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uint up = id.y - epsilon;
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uint down = id.y + epsilon;
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float dzdx = ((In_HeightTex[uint2(right, down)] + 2.0f * In_HeightTex[uint2(right, id.y)] + In_HeightTex[uint2(right, up)]) -
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(In_HeightTex[uint2(left, down)] + 2.0f * In_HeightTex[uint2(left, id.y)] + In_HeightTex[uint2(left, up)])) / 8.0f;
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float dzdy = ((In_HeightTex[uint2(left, up)] + 2.0f * In_HeightTex[uint2(id.x, up)] + In_HeightTex[uint2(right, up)]) -
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(In_HeightTex[uint2(left, down)] + 2.0f * In_HeightTex[uint2(id.x, down)] + In_HeightTex[uint2(right, down)])) / 8.0f;
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return normalize(float2(dzdx, dzdy));
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}
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float GetAspectScale(uint2 id, float h)
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{
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float epsilon = AspectValues.z;
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float2 n = computeNormal(id, epsilon);
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float aspect = saturate(dot(n, AspectValues.xy));
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uint remapIdx = (uint)(aspect * (float)(RemapTexRes - 1));
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return RemapTex[uint2(remapIdx, 0)];
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}
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#pragma kernel AspectRemap
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[numthreads(1, 1, 1)]
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void AspectRemap(uint3 id : SV_DispatchThreadID)
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{
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float aspectMask = GetAspectScale(id.xy, In_HeightTex[id.xy]);
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OutputTex[id.xy] = lerp(1.0f, aspectMask, EffectStrength) * In_BaseMaskTex[id.xy];
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}
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