/*=============================================================================
	ModShadowVolumePixelShader.usf: Pixel shader for modulated shadow volumes
	Copyright 1998-2010 Epic Games, Inc. All Rights Reserved.
=============================================================================*/

#include "Common.usf"
#include "ModShadowCommon.usf"

void Main(
	in float4 ScreenPosition : TEXCOORD0,
	// BIOSTART - September 15, 2010 - Wihlidal, Graham - PS3 Fragment and Vertex Shader Optimizations
	out half4 OutColor : SV_Target0
	// BIOEND
	)
{
	half SceneW = PreviousDepth(ScreenPosition);

#if MODSHADOW_LIGHTTYPE_DIRECTIONAL
	// no attenuation necessary for directional lights
	half ShadowAtt = 1;
#else
	// attenuate between shadow color and white based on distance
	half ShadowAtt = ShadowAttenuation(ScreenPosition,SceneW);
#endif

	// add modulated/attenuated shadow color to shadow
	// BIOSTART - September 15, 2010 - Wihlidal, Graham - PS3 Fragment and Vertex Shader Optimizations
	half4 ShadowedColor = lerp(half4(1,1,1,1),ShadowModulateColor,ShadowAtt);
	// BIOEND
	// RETURN_COLOR not needed with modulative blending
	OutColor = ShadowedColor;
}