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30 lines
1.0 KiB
Plaintext
30 lines
1.0 KiB
Plaintext
// Copyright Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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CubemapCommon.usf: Cubemap shared functions and structures.
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=============================================================================*/
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// include common.usf to get PI
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//
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TextureCube AmbientCubemap;
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SamplerState AmbientCubemapSampler;
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// .rgb:AmbientCubemapTint*AmbientCubemapIntensity, a:unused
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half4 AmbientCubemapColor;
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// .x:mul, .y:add for mip adjustement, z:DiffuseMip=MipCount-DiffuseConvolveMipLevel, w:MipCount
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half4 AmbientCubemapMipAdjust;
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// @param MipCount e.g. 10 for x 512x512
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half ComputeCubemapMipFromRoughness( half Roughness, half MipCount )
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{
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// Level starting from 1x1 mip
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half Level = 3 - 1.15 * log2( Roughness );
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return MipCount - 1 - Level;
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}
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// used for Translucency volume, can be optimized by precomputing the color on CPU side
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float3 ComputeAmbientCubemapAvgColor()
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{
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return TextureCubeSampleLevel(AmbientCubemap, AmbientCubemapSampler, float3(0, 0, 0), 20.0f).rgb * AmbientCubemapColor.rgb;
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} |