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19 lines
797 B
Plaintext
19 lines
797 B
Plaintext
// Copyright 1998-2014 Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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ColorUtils.hlsl: Some utility functions for dealing with colors.
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=============================================================================*/
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void ReplicateChannel(inout float4 BaseColor, half4 InComponentReplicate, half4 InComponentReplicateAlpha)
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{
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#if FEATURE_LEVEL >= FEATURE_LEVEL_SM4
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//In SM4/5, doing a texture lookup from a G8 texture gives float4(value,0,0,0), so we need to replicate it to the other channels.
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//On all other platforms, the value is replicated automatically.
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if(any(InComponentReplicate != 0.0))
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{
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BaseColor = dot(BaseColor,InComponentReplicate);
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}
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#endif
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BaseColor.a = dot(BaseColor,InComponentReplicateAlpha);
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}
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