// Copyright 1998-2014 Epic Games, Inc. All Rights Reserved.

/*=============================================================================
	ColorUtils.hlsl: Some utility functions for dealing with colors.
=============================================================================*/

void ReplicateChannel(inout float4 BaseColor, half4 InComponentReplicate, half4 InComponentReplicateAlpha)
{
#if FEATURE_LEVEL >= FEATURE_LEVEL_SM4
	//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.  
	//On all other platforms, the value is replicated automatically.
	if(any(InComponentReplicate != 0.0))
	{
		BaseColor = dot(BaseColor,InComponentReplicate);
	}
#endif
	BaseColor.a = dot(BaseColor,InComponentReplicateAlpha);
}