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24 lines
1.2 KiB
24 lines
1.2 KiB
#ifndef VOLUMETRIC_CLOUDS_SHADOW_SAMPLING
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#define VOLUMETRIC_CLOUDS_SHADOW_SAMPLING
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float EvaluateVolumetricCloudsShadows(DirectionalLightData light, float3 positionWS)
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{
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// Compute the vector from the shadow origin to the point to shade
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float3 shadowOriginVec = positionWS - _VolumetricCloudsShadowOriginToggle.xyz;
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// Compute the Coordinates of the point in the local space of the shadow
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float xCoord = dot(shadowOriginVec, normalize(light.right)) / _VolumetricCloudsShadowScale.x;
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float yCoord = dot(shadowOriginVec, normalize(light.up)) / _VolumetricCloudsShadowScale.y;
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float zCoord = dot(shadowOriginVec, -light.forward);
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// We let the sampler handle clamping to border.
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float2 uv = saturate(float2(xCoord, yCoord));
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float3 cloudsShadow = SAMPLE_TEXTURE2D_LOD(_VolumetricCloudsShadowsTexture, s_linear_clamp_sampler, uv, 0).rgb;
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// Evaluate the shadow
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float shadowRange = saturate((1.0 / zCoord - cloudsShadow.x) / (cloudsShadow.z - cloudsShadow.x));
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float shadowValue = cloudsShadow.y != 1.0 ? lerp(cloudsShadow.y, 1.0, shadowRange) : 1.0;
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return (all(uv != 0.0) && all(uv != 1.0)) ? shadowValue : _VolumetricCloudsFallBackValue;
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}
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#endif // VOLUMETRIC_CLOUDS_SHADOW_SAMPLING
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