UnrealEngineUWP/Engine/Shaders/PostProcessMobile.usf

// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.

/*=============================================================================
	PostProcessMobile.usf: Combined {bloom, sunshafts, depth of field}
=============================================================================*/

#include "Common.usf"
#include "PostProcessCommon.usf"

// Point on circle.
float2 Circle(float Start, float Points, float Point) 
{
	float Rad = (3.141592 * 2.0 * (1.0 / Points)) * (Point + Start);
	return float2(sin(Rad), cos(Rad));
}

// x:BloomThreshold, yz:unused, w:ExposureScale (useful if eyeadaptation is locked)
float4 BloomThreshold;

half FocusDistFar()
{
	return View.DepthOfFieldFocalDistance + View.DepthOfFieldFocalRegion;
}

half FocusDistNear()
{
	return View.DepthOfFieldFocalDistance;
}

// Alpha = 0.5 is full size, >0.5 rate at which near and far hit maximum.
float4 SunColorApertureDiv2;

// Returns 0=max near DOF, 0.5=in focus, 1.0=max far DOF
half Coc(half Depth) 
{
	half FocusDist = clamp(Depth,half(FocusDistNear()),half(FocusDistFar()));
	half CocValue = ((Depth - FocusDist) / Depth);
	return saturate(CocValue * SunColorApertureDiv2.a + 0.5);
}

half2 SunConstDepthMaskScaleBias() 
{
	half DepthMin = 65504.0 - 16384.0;
	half DepthMax = 65504.0 - 0.0;
	// Compute scale and bias.
	half Scale = 1.0/(DepthMax-DepthMin);
	return half2(Scale,-DepthMin * Scale);
}




//
// Convert depth in alpha into combined circle of confusion and sun intensity.
// Or pre-tonemap before hardware box-filtered resolve.
//

void SunMaskVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float4 OutUVPos : TEXCOORD0,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle(InPosition, InTexCoord, OutPosition, OutUVPos.xy);
	OutUVPos.zw = OutPosition.xy;
}

void SunMaskPS_ES2(
	float4 InUVPos : TEXCOORD0,
	out half4 OutColor : SV_Target0
	)
{
	#if (COMPILER_GLSL_ES2 && ES2_USE_FETCH) || METAL_PROFILE
		OutColor = FramebufferFetchES2();
	#else
		OutColor = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVPos.xy);
	#endif

	#if ES2_USE_MSAA
		// On-chip pre-tonemap before MSAA resolve.
		OutColor.rgb *= rcp(OutColor.r*0.299 + OutColor.g*0.587 + OutColor.b*0.114 + 1.0);
	#else
		half InDepth = OutColor.a;
	
		#if ES2_USE_SUN
			half2 DepthMaskScaleBias = SunConstDepthMaskScaleBias();
			half FarAmount = saturate(InDepth * DepthMaskScaleBias.x + DepthMaskScaleBias.y);
			half3 SunAmount = OutColor.rgb * SunColorApertureDiv2.rgb;
	
			half2 Pos = InUVPos.zw * 0.5 + 0.5;
			half EdgeMask = 1.0f - Pos.x * (1.0f - Pos.x) * Pos.y * (1.0f - Pos.y) * 8.0f;
			EdgeMask = EdgeMask * EdgeMask;
	
			FarAmount *= 1.0-EdgeMask;
	
			OutColor.a = min(min(SunAmount.r, SunAmount.g), SunAmount.b) * FarAmount;
		#else
			OutColor.a = 0.0;
		#endif
		
		#if ES2_USE_DOF
			OutColor.a += Coc(InDepth);
		#endif
	#endif
}




// 
// Bloom Setup - Mask Bloom and Downsample 1/16 Area
//

void BloomVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float2 OutTexCoords[4] : TEXCOORD0,
	out float4 OutPosition : SV_POSITION
	)
{
	float2 TransformedUV;
	DrawRectangle(InPosition, InTexCoord, OutPosition, TransformedUV);

	OutTexCoords[0] = TransformedUV + PostprocessInput0Size.zw * float2(-1, -1);
	OutTexCoords[1] = TransformedUV + PostprocessInput0Size.zw * float2( 1, -1);
	OutTexCoords[2] = TransformedUV + PostprocessInput0Size.zw * float2(-1,  1);
	OutTexCoords[3] = TransformedUV + PostprocessInput0Size.zw * float2( 1,  1);
}

void BloomPS_ES2(
	float2 InUVs[4] : TEXCOORD0,
	out half4 OutColor : SV_Target0
	)
{
	half4 C0 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0]);
	half4 C1 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1]);
	half4 C2 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2]);
	half4 C3 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3]);

	// Output color is average.
	OutColor.rgb = (C0.rgb * 0.25) + (C1.rgb * 0.25) + (C2.rgb * 0.25) + (C3.rgb * 0.25);

	#if ES2_USE_MSAA
		// This should really happen before the average, instead doing after average as optimization.
		OutColor.rgb *= rcp(OutColor.r*(-0.299) + OutColor.g*(-0.587) + OutColor.b*(-0.114) + 1.0);
	#endif

	// Try to kill negatives and NaNs here
	OutColor.rgb = max(OutColor.rgb, 0);

	// Trim bloom and sunshafts black level.
	half TotalLuminance = Luminance(OutColor.rgb);
	half BloomLuminance = TotalLuminance - BloomThreshold.x;
	half Amount = saturate(BloomLuminance * 0.5f);
	OutColor.rgb *= Amount;

	// In the case of both DOF and SUN,
	// Split out alpha back into dual components (circle of confusion size and sun amount).
	// Expand {near to in-focus} {0.0 to 0.5} to {0.0 to 1.0} for near DOF diolation.
	// Must keep 1.0 the in-focus here (sunshaft pass will use this data).

	#if ES2_USE_DOF
		// Expand {near to in-focus} {0.0 to 0.5} to {0.0 to 1.0} for near DOF diolation.
		// Must keep 1.0 the in-focus here (sunshaft pass will use this data).
		half Coc0 = saturate(C0.a*2.0);
		half Coc1 = saturate(C1.a*2.0);
		half Coc2 = saturate(C2.a*2.0);
		half Coc3 = saturate(C3.a*2.0);

		// Take min of COC (which is maximum near radius).
		OutColor.a = min(min(Coc0,Coc1),min(Coc2,Coc3));

		// Improve the quality of near diolation.
		OutColor.a = 1.0 - OutColor.a;
		OutColor.a *= OutColor.a;
		OutColor.a = 1.0 - OutColor.a;
	#else
		OutColor.a = 0.0;
	#endif

	#if ES2_USE_SUN
		half Sun0 = max(0.0, C0.a-1.0);
		half Sun1 = max(0.0, C1.a-1.0);
		half Sun2 = max(0.0, C2.a-1.0);
		half Sun3 = max(0.0, C3.a-1.0);

		// Take average of sun intensity and adjust by bloom threshold.
		Amount *= 0.25;
		OutColor.a += (Sun0 * Amount) + (Sun1 * Amount) + (Sun2 * Amount) + (Sun3 * Amount);
	#endif
}




// 
// Bloom Setup Small - Downsample 1/16 Area
//

void BloomSmallVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float4 OutTexCoords[8] : TEXCOORD0,
	out float4 OutPosition : SV_POSITION
	)
{

	DrawRectangle(InPosition, InTexCoord, OutPosition, InTexCoord);
	
	float Start = 2.0/14.0;
	float Scale = 0.66 * 4.0 * 2.0;

	OutTexCoords[0].xy = InTexCoord.xy;
	OutTexCoords[0].zw = InTexCoord.xy + Circle(Start, 14.0, 0.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[1].xy = InTexCoord.xy + Circle(Start, 14.0, 1.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[1].zw = InTexCoord.xy + Circle(Start, 14.0, 2.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[2].xy = InTexCoord.xy + Circle(Start, 14.0, 3.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[2].zw = InTexCoord.xy + Circle(Start, 14.0, 4.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[3].xy = InTexCoord.xy + Circle(Start, 14.0, 5.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[3].zw = InTexCoord.xy + Circle(Start, 14.0, 6.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[4].xy = InTexCoord.xy + Circle(Start, 14.0, 7.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[4].zw = InTexCoord.xy + Circle(Start, 14.0, 8.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[5].xy = InTexCoord.xy + Circle(Start, 14.0, 9.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[5].zw = InTexCoord.xy + Circle(Start, 14.0, 10.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[6].xy = InTexCoord.xy + Circle(Start, 14.0, 11.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[6].zw = InTexCoord.xy + Circle(Start, 14.0, 12.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[7].xy = InTexCoord.xy + Circle(Start, 14.0, 13.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[7].zw = float2(0.0, 0.0);
}

void BloomSmallPS_ES2(
	float4 InUVs[8] : TEXCOORD0,
	out half4 OutColor : SV_Target0
	)
{
	half3 N0 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0].xy).rgb;
	half3 N1 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0].zw).rgb;
	half3 N2 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1].xy).rgb;
	half3 N3 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1].zw).rgb;
	half3 N4 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2].xy).rgb;
	half3 N5 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2].zw).rgb;
	half3 N6 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3].xy).rgb;
	half3 N7 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3].zw).rgb;
	half3 N8 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[4].xy).rgb;
	half3 N9 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[4].zw).rgb;
	half3 N10 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[5].xy).rgb;
	half3 N11 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[5].zw).rgb;
	half3 N12 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[6].xy).rgb;
	half3 N13 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[6].zw).rgb;
	half3 N14 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[7].xy).rgb;

	half W = 1.0/15.0;
	OutColor.rgb = 
		(N0 * W) +
		(N1 * W) +
		(N2 * W) +
		(N3 * W) +
		(N4 * W) +
		(N5 * W) +
		(N6 * W) +
		(N7 * W) +
		(N8 * W) +
		(N9 * W) +
		(N10 * W) +
		(N11 * W) +
		(N12 * W) +
		(N13 * W) +
		(N14 * W);

	// Trim bloom black level.
	half TotalLuminance = Luminance(OutColor.rgb);
	half BloomLuminance = TotalLuminance - BloomThreshold.x;
	half Amount = saturate(BloomLuminance * 0.5f);
	OutColor.rgb *= Amount;
}






// 
// Bloom Downsample  
//

float BloomDownScale;

void BloomDownVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float4 OutTexCoords[8] : TEXCOORD0,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle(InPosition, InTexCoord, OutPosition, InTexCoord);

	float Start = 2.0/14.0;
	float Scale = BloomDownScale;

	OutTexCoords[0].xy = InTexCoord.xy;
	OutTexCoords[0].zw = InTexCoord.xy + Circle(Start, 14.0, 0.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[1].xy = InTexCoord.xy + Circle(Start, 14.0, 1.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[1].zw = InTexCoord.xy + Circle(Start, 14.0, 2.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[2].xy = InTexCoord.xy + Circle(Start, 14.0, 3.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[2].zw = InTexCoord.xy + Circle(Start, 14.0, 4.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[3].xy = InTexCoord.xy + Circle(Start, 14.0, 5.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[3].zw = InTexCoord.xy + Circle(Start, 14.0, 6.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[4].xy = InTexCoord.xy + Circle(Start, 14.0, 7.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[4].zw = InTexCoord.xy + Circle(Start, 14.0, 8.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[5].xy = InTexCoord.xy + Circle(Start, 14.0, 9.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[5].zw = InTexCoord.xy + Circle(Start, 14.0, 10.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[6].xy = InTexCoord.xy + Circle(Start, 14.0, 11.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[6].zw = InTexCoord.xy + Circle(Start, 14.0, 12.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[7].xy = InTexCoord.xy + Circle(Start, 14.0, 13.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[7].zw = float2(0.0, 0.0);
}

void BloomDownPS_ES2(
	float4 InUVs[8] : TEXCOORD0,
	out half4 OutColor : SV_Target0
	)
{
	half3 N0 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0].xy).rgb;
	half3 N1 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0].zw).rgb;
	half3 N2 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1].xy).rgb;
	half3 N3 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1].zw).rgb;
	half3 N4 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2].xy).rgb;
	half3 N5 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2].zw).rgb;
	half3 N6 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3].xy).rgb;
	half3 N7 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3].zw).rgb;
	half3 N8 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[4].xy).rgb;
	half3 N9 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[4].zw).rgb;
	half3 N10 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[5].xy).rgb;
	half3 N11 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[5].zw).rgb;
	half3 N12 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[6].xy).rgb;
	half3 N13 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[6].zw).rgb;
	half3 N14 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[7].xy).rgb;

	half W = 1.0/15.0;
	OutColor.rgb = 
		(N0 * W) +
		(N1 * W) +
		(N2 * W) +
		(N3 * W) +
		(N4 * W) +
		(N5 * W) +
		(N6 * W) +
		(N7 * W) +
		(N8 * W) +
		(N9 * W) +
		(N10 * W) +
		(N11 * W) +
		(N12 * W) +
		(N13 * W) +
		(N14 * W);
}


// 
// Bloom Upsample
//

float2 BloomUpScales;

void BloomUpVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float4 OutTexCoords[8] : TEXCOORD0,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle(InPosition, InTexCoord, OutPosition, InTexCoord);

	float Start;
	float Scale;

	Start = 2.0/7.0;
	Scale = BloomUpScales.x;


	OutTexCoords[0].xy = InTexCoord.xy + Circle(Start, 7.0, 0.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[0].zw = InTexCoord.xy + Circle(Start, 7.0, 1.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[1].xy = InTexCoord.xy + Circle(Start, 7.0, 2.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[1].zw = InTexCoord.xy + Circle(Start, 7.0, 3.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[2].xy = InTexCoord.xy + Circle(Start, 7.0, 4.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[2].zw = InTexCoord.xy + Circle(Start, 7.0, 5.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[3].xy = InTexCoord.xy + Circle(Start, 7.0, 6.0) * Scale * PostprocessInput0Size.zw;

	OutTexCoords[3].zw = InTexCoord.xy;

	Start = 2.0/7.0;
	Scale = BloomUpScales.y;

	OutTexCoords[4].xy = InTexCoord.xy + Circle(Start, 7.0, 0.0) * Scale * PostprocessInput1Size.zw;
	OutTexCoords[4].zw = InTexCoord.xy + Circle(Start, 7.0, 1.0) * Scale * PostprocessInput1Size.zw;
	OutTexCoords[5].xy = InTexCoord.xy + Circle(Start, 7.0, 2.0) * Scale * PostprocessInput1Size.zw;
	OutTexCoords[5].zw = InTexCoord.xy + Circle(Start, 7.0, 3.0) * Scale * PostprocessInput1Size.zw;
	OutTexCoords[6].xy = InTexCoord.xy + Circle(Start, 7.0, 4.0) * Scale * PostprocessInput1Size.zw;
	OutTexCoords[6].zw = InTexCoord.xy + Circle(Start, 7.0, 5.0) * Scale * PostprocessInput1Size.zw;
	OutTexCoords[7].xy = InTexCoord.xy + Circle(Start, 7.0, 6.0) * Scale * PostprocessInput1Size.zw;
	OutTexCoords[7].zw = float2(0.0, 0.0);
}

float4 BloomTintA;
float4 BloomTintB;

void BloomUpPS_ES2(
	float4 InUVs[8] : TEXCOORD0,
	out half4 OutColor : SV_Target0
	)
{
	half3 A0 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0].xy).rgb;
	half3 A1 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0].zw).rgb;
	half3 A2 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1].xy).rgb;
	half3 A3 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1].zw).rgb;
	half3 A4 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2].xy).rgb;
	half3 A5 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2].zw).rgb;
	half3 A6 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3].xy).rgb;
	half3 A7 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3].zw).rgb;

	half3 B0 = PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[3].zw).rgb;
	half3 B1 = PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[4].xy).rgb;
	half3 B2 = PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[4].zw).rgb;
	half3 B3 = PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[5].xy).rgb;
	half3 B4 = PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[5].zw).rgb;
	half3 B5 = PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[6].xy).rgb;
	half3 B6 = PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[6].zw).rgb;
	half3 B7 = PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[7].xy).rgb;

	// A is the same size source.
	half3 WA = BloomTintA.rgb;
	// B is the upsampled source.
	half3 WB = BloomTintB.rgb;

	OutColor.rgb = 
		A0 * WA + 
		A1 * WA + 
		A2 * WA + 
		A3 * WA + 
		A4 * WA + 
		A5 * WA + 
		A6 * WA + 
		A7 * WA +
		B0 * WB + 
		B1 * WB + 
		B2 * WB + 
		B3 * WB + 
		B4 * WB + 
		B5 * WB + 
		B6 * WB + 
		B7 * WB;
}


// 
// Near Setup - Generate near diolation for DOF.
//

void DofNearVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float2 OutTexCoords2 : TEXCOORD0,
	out float4 OutTexCoords4[4] : TEXCOORD1,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle(InPosition, InTexCoord, OutPosition, InTexCoord);

	OutTexCoords2 = InTexCoord;
	OutTexCoords4[0].xy = InTexCoord + PostprocessInput0Size.zw * float2(-0.5,-1.0);
	OutTexCoords4[0].zw = InTexCoord + PostprocessInput0Size.zw * float2( 1.0,-0.5);
	OutTexCoords4[1].xy = InTexCoord + PostprocessInput0Size.zw * float2( 0.5, 1.0);
	OutTexCoords4[1].zw = InTexCoord + PostprocessInput0Size.zw * float2(-1.0, 0.5);
	OutTexCoords4[2].xy = InTexCoord + PostprocessInput0Size.zw * float2( 0.5,-1.0);
	OutTexCoords4[2].zw = InTexCoord + PostprocessInput0Size.zw * float2( 1.0, 0.5);
	OutTexCoords4[3].xy = InTexCoord + PostprocessInput0Size.zw * float2(-0.5, 1.0);
	OutTexCoords4[3].zw = InTexCoord + PostprocessInput0Size.zw * float2(-1.0,-0.5);
}

void DofNearPS_ES2(
	float2 InUVs2 : TEXCOORD0,
	float4 InUVs[4] : TEXCOORD1,
	out half OutColor : SV_Target0
	)
{
	half N0 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs2).a;
	half N1 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0].xy).a;
	half N2 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0].zw).a;
	half N3 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1].xy).a;
	half N4 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1].zw).a;
	half N5 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2].xy).a;
	half N6 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2].zw).a;
	half N7 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3].xy).a;
	half N8 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3].zw).a;

	// Remove sunshaft intensity component and reverse.
	#if ES2_USE_SUN
		N0 = saturate(1.0 - N0);
		N1 = saturate(1.0 - N1);
		N2 = saturate(1.0 - N2);
		N3 = saturate(1.0 - N3);
		N4 = saturate(1.0 - N4);
		N5 = saturate(1.0 - N5);
		N6 = saturate(1.0 - N6);
		N7 = saturate(1.0 - N7);
		N8 = saturate(1.0 - N8);
	#else
		// If no sun-shafts then don't need the saturate.
		N0 = 1.0 - N0;
		N1 = 1.0 - N1;
		N2 = 1.0 - N2;
		N3 = 1.0 - N3;
		N4 = 1.0 - N4;
		N5 = 1.0 - N5;
		N6 = 1.0 - N6;
		N7 = 1.0 - N7;
		N8 = 1.0 - N8;
	#endif

	// The first sample is 1/4 the size as the rest of the samples.
	OutColor = (N0 * 0.25 + N1 + N2 + N3 + N4 + N5 + N6 + N7 + N8) / 8.25;
	if(OutColor > 0.0) OutColor = sqrt(OutColor);
}


// 
// DOF Setup - Downsample to 1/4 area
//



void DofDownVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float2 OutTexCoords[5] : TEXCOORD0,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle(InPosition, InTexCoord, OutPosition, InTexCoord);

	// Near position fixed to use UV based out output position.
	OutTexCoords[0] = OutPosition.xy * float2(0.5,-0.5) + 0.5;
	// Other source UVs based on possible non-full texture.
	OutTexCoords[1] = InTexCoord + PostprocessInput0Size.zw * float2(-0.5, -0.5);
	OutTexCoords[2] = InTexCoord + PostprocessInput0Size.zw * float2( 0.5, -0.5);
	OutTexCoords[3] = InTexCoord + PostprocessInput0Size.zw * float2(-0.5,  0.5);
	OutTexCoords[4] = InTexCoord + PostprocessInput0Size.zw * float2( 0.5,  0.5);
}

void DofDownPS_ES2(
	float2 InUVs[5] : TEXCOORD0,
	out half4 OutColor : SV_Target0
	)
{
	// This shader needs float precision to work.

	// Fetch near diolation and scale to (0 to 16384.0) range.
	float N = PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[0]).r * 16384.0;

	float4 A = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1]);
	float4 B = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2]);
	float4 C = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3]);
	float4 D = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[4]);

	#if ES2_USE_SUN
		// The {0.0 to 1.0} range is focus.
		// The {1.0 to 65504.0} range is light shaft source intensity (always at fully out of focus).
		// Must clamp back to {0.0 to 1.0} range.
		A.a = min(1.0, A.a);
		B.a = min(1.0, B.a);
		C.a = min(1.0, C.a);
		D.a = min(1.0, D.a);
	#endif

	// To support near DOF the {0.0 to 1.0} maps to {-16384.0 to 16384.0}.
	A.a = A.a * (2.0 * 16384.0) - 16384.0;
	B.a = B.a * (2.0 * 16384.0) - 16384.0;
	C.a = C.a * (2.0 * 16384.0) - 16384.0;
	D.a = D.a * (2.0 * 16384.0) - 16384.0;

	// Make sure there are no zeros.
	// Alpha ends up as circle of confusion size.
	// Near diolation factor applied here.
	// The 1/8 factor is to workaround mobile hardware lack of precision.
	A.a = max(N, abs(A.a) + 1.0/8.0);
	B.a = max(N, abs(B.a) + 1.0/8.0);
	C.a = max(N, abs(C.a) + 1.0/8.0);
	D.a = max(N, abs(D.a) + 1.0/8.0);

	// Mix weighted by circle of confusion.
	// This tends to erode the effect of more infocus samples (removes bleeding artifacts).
	OutColor = ((A * A.a) + (B * B.a) + (C * C.a) + (D * D.a)) * rcp(A.a + B.a + C.a + D.a);
	OutColor.rgb *= OutColor.a;
}


//
// DOF Blur
//

// DOF BOKEH SAMPLING PATTERN
// --------------------
// # = bilinear tap
// * = the single point tap to get the current pixel
//
//       1 1    
//   4 4 1 * 2 2
//   4 4 3 3 2 2 
//       3 3
//
// This pattern is very important.
// All bilinear taps are not always exactly in the middle of 4 texels.
// It is an asymetric pattern (minimize overlap, allow for different radii).
#define DOF_1 half2(-0.500, 0.50)
#define DOF_2 half2( 0.75,-0.50)
#define DOF_3 half2(-0.500,-1.25)
#define DOF_4 half2(-1.75,-0.50)



// This will compute a constant half2 from a constant half2.
// This computes the soft blend factor for intersection test
// (does circle of confusion intersect pixel center).
// Large feather here to make transitions smooth with a few samples.
half2 DofIntersectionScaleBias(half2 Offset) 
{
	// Working in distance squared.
	// Normalize by maximum distance 
	half RcpMaxDst = rcp(sqrt(dot(DOF_4, DOF_4)));
	half Dst0 = sqrt(dot(DOF_1, DOF_1));
	half Dst1 = sqrt(dot(Offset, Offset));
	Dst0 = max(Dst0, Dst1 - 0.25);
	Dst0 *= RcpMaxDst;
	Dst1 *= RcpMaxDst;
	half Scale = 1.0/(Dst1 - Dst0);
	half Bias = (-Dst0) * Scale;
	return half2(Scale, Bias);
}

half DofIntersect(half CocTap, half2 Offset)
{
	half2 ConstScaleBias = DofIntersectionScaleBias(Offset);
	// Undo the scale factor.
	ConstScaleBias.x *= 1.0/16384.0;
	return saturate(CocTap * ConstScaleBias.x + ConstScaleBias.y);
}

half DofWeight(half Coc) 
{
	half Dst0 = sqrt(dot(DOF_3, DOF_3)) / sqrt(dot(DOF_4, DOF_4));
	half Dst1 = sqrt(dot(DOF_4, DOF_4)) / sqrt(dot(DOF_4, DOF_4));
	half Scale = 1.0/(Dst1 - Dst0);
	half Bias = (-Dst0) * Scale;
	// Undo the 16384.0 scale factor in this constant.
	Scale *= 1.0/16384.0;
	// Scale and Bias should be compile time constants.
	return saturate(Coc * Scale + Bias);
}

void DofBlurVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float2 OutTexCoords[5] : TEXCOORD0,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle(InPosition, InTexCoord, OutPosition, InTexCoord);

    OutTexCoords[0] = InTexCoord.xy;
    OutTexCoords[1] = InTexCoord.xy + float2(DOF_1) * PostprocessInput0Size.zw;
    OutTexCoords[2] = InTexCoord.xy + float2(DOF_2) * PostprocessInput0Size.zw;
    OutTexCoords[3] = InTexCoord.xy + float2(DOF_3) * PostprocessInput0Size.zw;
    OutTexCoords[4] = InTexCoord.xy + float2(DOF_4) * PostprocessInput0Size.zw;
}

void DofBlurPS_ES2(
	float2 InUVs[5] : TEXCOORD0,
	out half4 OutColor : SV_Target0
	)
{
	// Near diolation size is copied into alpha for the tonemapper pass.
	OutColor.a = PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[0]).r;

	half4 C1 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1]);
	half4 C2 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2]);
	half4 C3 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3]);
	half4 C4 = PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[4]);

	// Restore color (colors are weighted by CoC to help remove bleeding).
	C1.rgb *= rcp(C1.a);
	C2.rgb *= rcp(C2.a);
	C3.rgb *= rcp(C3.a);
	C4.rgb *= rcp(C4.a);

	// First bilinear tap always has 1.0 weight, the rest are weighted.
	half W1 = 1.0, W2, W3, W4;
	W2 = W3 = W4 = DofWeight(C1.a);
	
	// Remove contribution of taps who's circle of confusion does not intersect the pixel.
	W2 *= DofIntersect(C2.a, DOF_2);
	W3 *= DofIntersect(C3.a, DOF_3);
	W4 *= DofIntersect(C4.a, DOF_4);

	OutColor.rgb = ((C1.rgb * W1) + (C2.rgb * W2) + (C3.rgb * W3) + (C4.rgb * W4)) * rcp(W1 + W2 + W3 + W4);
}


//
// First sun shaft blur and move sun intensity from alpha to single channel output.
//

half HighlightCompression(half Channel) 
{
	return Channel * rcp(1.0 + Channel);
}
	
half HighlightDecompression(half Channel) 
{
	return Channel * rcp(1.0 - Channel);
}


// Convert from [-1 to 1] to view rectangle in texture which is somewhere in [0 to 1].
float2 SunShaftPosToUV(float2 Pos)
{
//	return (Pos.xy * ScreenPosToPixel.xy + ScreenPosToPixel.zw + 0.5f) * PostprocessInput0Size.zw;
	return Pos.xy * float2(0.5,-0.5) + 0.5;
}

// Center of light shaft.
float4 LightShaftCenter;

// Position in {-1 to 1} space.
float2 SunPos() 
{
	return LightShaftCenter.xy;
}

float2 SunShaftRect(float2 InPosition, float amount) 
{
	float2 center = SunPos();
	return SunShaftPosToUV(lerp(center, InPosition, amount));
}

// Positions for sun shaft steps.
// The very tight first position makes direct light to eye bloom a little.
// Otherwise want even spacing.
#define SUN_P0 (31.0/32.0)
#define SUN_P1 (27.0/32.0)
#define SUN_P2 (23.0/32.0)
#define SUN_P3 (19.0/32.0)
#define SUN_P4 (15.0/32.0)
#define SUN_P5 (11.0/32.0)
#define SUN_P6 (7.0/32.0)
// SUN_P7 is fixed at zero.

#define SUN_M 1.0

void SunAlphaVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float2 OutTexCoords[8] : TEXCOORD0,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle(InPosition, InTexCoord, OutPosition, InTexCoord);

    OutTexCoords[0] = SunShaftRect(InPosition.xy, 1.0 - SUN_P0 * SUN_M);
    OutTexCoords[1] = SunShaftRect(InPosition.xy, 1.0 - SUN_P1 * SUN_M);
    OutTexCoords[2] = SunShaftRect(InPosition.xy, 1.0 - SUN_P2 * SUN_M);
    OutTexCoords[3] = SunShaftRect(InPosition.xy, 1.0 - SUN_P3 * SUN_M);
    OutTexCoords[4] = SunShaftRect(InPosition.xy, 1.0 - SUN_P4 * SUN_M);
    OutTexCoords[5] = SunShaftRect(InPosition.xy, 1.0 - SUN_P5 * SUN_M);
    OutTexCoords[6] = SunShaftRect(InPosition.xy, 1.0 - SUN_P6 * SUN_M);
    OutTexCoords[7] = InTexCoord.xy;
}

#undef SUN_M

// Remove the +1 bias.
// This sets negatives to zero because 0-1 is used for DOF.
half SunUnBias(half A)
{
	#if ES2_USE_DOF
		return max(0.0, A - 1.0);
	#else
		return A;
	#endif
}

void SunAlphaPS_ES2(
	float2 InUVs[8] : TEXCOORD0,
	out half4 OutColor : SV_Target0
	)
{
	OutColor.r = 
		SunUnBias(PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0]).a) * 0.125 +
		SunUnBias(PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1]).a) * 0.125 +
		SunUnBias(PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2]).a) * 0.125 +
		SunUnBias(PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3]).a) * 0.125 +
		SunUnBias(PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[4]).a) * 0.125 +
		SunUnBias(PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[5]).a) * 0.125 +
		SunUnBias(PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[6]).a) * 0.125 +
		SunUnBias(PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[7]).a) * 0.125;
	OutColor.r = HighlightCompression(OutColor.r);
}




//
// Second sun shaft blur.
//

#define SUN_M 0.5

void SunBlurVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float2 OutTexCoords[8] : TEXCOORD0,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle(InPosition, InTexCoord, OutPosition, InTexCoord);

    OutTexCoords[0] = SunShaftRect(InPosition.xy, 1.0 - SUN_P0 * SUN_M);
    OutTexCoords[1] = SunShaftRect(InPosition.xy, 1.0 - SUN_P1 * SUN_M);
    OutTexCoords[2] = SunShaftRect(InPosition.xy, 1.0 - SUN_P2 * SUN_M);
    OutTexCoords[3] = SunShaftRect(InPosition.xy, 1.0 - SUN_P3 * SUN_M);
    OutTexCoords[4] = SunShaftRect(InPosition.xy, 1.0 - SUN_P4 * SUN_M);
    OutTexCoords[5] = SunShaftRect(InPosition.xy, 1.0 - SUN_P5 * SUN_M);
    OutTexCoords[6] = SunShaftRect(InPosition.xy, 1.0 - SUN_P6 * SUN_M);
    OutTexCoords[7] = InTexCoord.xy;
}

#undef SUN_M

void SunBlurPS_ES2(
	float2 InUVs[8] : TEXCOORD0,
	out half4 OutColor : SV_Target0
	)
{
	OutColor.r = 
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0]).r * 0.125 +
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1]).r * 0.125 +
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2]).r * 0.125 +
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3]).r * 0.125 +
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[4]).r * 0.125 +
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[5]).r * 0.125 +
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[6]).r * 0.125 +
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[7]).r * 0.125;
}


//
// Third sun shaft blur, composite with bloom, vignette.
//

#define SUN_M 0.25

void SunMergeVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float4 OutTexCoordVignette : TEXCOORD0,
	out float4 OutTexCoords[7] : TEXCOORD1,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle(InPosition, InTexCoord, OutPosition, InTexCoord);

	OutTexCoordVignette.xy = InTexCoord.xy;
	OutTexCoordVignette.zw =  VignetteSpace(OutPosition.xy);

	float Start;
	float Scale;

	Start = 2.0/6.0;
	Scale = 0.66/2.0;

	OutTexCoords[0].xy = InTexCoord.xy + Circle(Start, 6.0, 0.0) * Scale * PostprocessInput2Size.zw;
	OutTexCoords[1].xy = InTexCoord.xy + Circle(Start, 6.0, 1.0) * Scale * PostprocessInput2Size.zw;
	OutTexCoords[2].xy = InTexCoord.xy + Circle(Start, 6.0, 2.0) * Scale * PostprocessInput2Size.zw;
	OutTexCoords[3].xy = InTexCoord.xy + Circle(Start, 6.0, 3.0) * Scale * PostprocessInput2Size.zw;
	OutTexCoords[4].xy = InTexCoord.xy + Circle(Start, 6.0, 4.0) * Scale * PostprocessInput2Size.zw;
	OutTexCoords[5].xy = InTexCoord.xy + Circle(Start, 6.0, 5.0) * Scale * PostprocessInput2Size.zw;

    OutTexCoords[0].zw = SunShaftRect(InPosition.xy, 1.0 - SUN_P0 * SUN_M);
    OutTexCoords[1].zw = SunShaftRect(InPosition.xy, 1.0 - SUN_P1 * SUN_M);
    OutTexCoords[2].zw = SunShaftRect(InPosition.xy, 1.0 - SUN_P2 * SUN_M);
    OutTexCoords[3].zw = SunShaftRect(InPosition.xy, 1.0 - SUN_P3 * SUN_M);
    OutTexCoords[4].zw = SunShaftRect(InPosition.xy, 1.0 - SUN_P4 * SUN_M);
    OutTexCoords[5].zw = SunShaftRect(InPosition.xy, 1.0 - SUN_P5 * SUN_M);
    OutTexCoords[6].xy = SunShaftRect(InPosition.xy, 1.0 - SUN_P6 * SUN_M);
	OutTexCoords[6].zw = float2(0.0, 0.0);

}

#undef SUN_M

float4 SunColorVignetteIntensity;
float3 BloomColor;

void SunMergePS_ES2(
	float4 InUVVignette : TEXCOORD0,
	float4 InUVs[7] : TEXCOORD1,
	out half4 OutColor : SV_Target0
	)
{
	#if ES2_USE_BLOOM

		float Scale1 = 1.0/7.0;

		float Scale2 = 1.0/7.0;

		half3 Bloom2 = (
			PostprocessInput1.Sample(PostprocessInput1Sampler, InUVVignette.xy).rgb * Scale1 + 
			PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[0].xy).rgb * Scale2 + 
			PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[1].xy).rgb * Scale2 +
			PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[2].xy).rgb * Scale2 + 
			PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[3].xy).rgb * Scale2 + 
			PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[4].xy).rgb * Scale2 + 
			PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[5].xy).rgb * Scale2) * rcp(Scale1 * 1.0 + Scale2 * 6.0);

		OutColor.rgb =	PostprocessInput2.Sample(PostprocessInput2Sampler, InUVVignette.xy).rgb;

		OutColor.rgb += Bloom2 * BloomColor;

		// Have 5 layers on mobile.
		OutColor.rgb *= 1.0/5.0;

	#else
		OutColor.rgb = half3(0.0, 0.0, 0.0);
	#endif

	#if ES2_USE_SUN
		half Sun = 
			PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0].zw).r * 0.125 +
			PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1].zw).r * 0.125 +
			PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2].zw).r * 0.125 +
			PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3].zw).r * 0.125 +
			PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[4].zw).r * 0.125 +
			PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[5].zw).r * 0.125 +
			PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[6].xy).r * 0.125 +
			PostprocessInput0.Sample(PostprocessInput0Sampler, InUVVignette.xy).r * 0.125;
		Sun = HighlightDecompression(Sun);
		OutColor.rgb += SunColorVignetteIntensity.rgb * Sun;
	#endif

	half Vignette = ComputeVignetteMask(InUVVignette.zw, SunColorVignetteIntensity.a);

	OutColor.a = Vignette;
	OutColor.rgb *= OutColor.a;
}

#undef SUN_P0
#undef SUN_P1
#undef SUN_P2
#undef SUN_P3
#undef SUN_P4
#undef SUN_P5
#undef SUN_P6




//
// Sun merge pass without sun but for small bloom final pass and vignette only.
//

void SunMergeSmallVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float4 OutTexCoordVignette : TEXCOORD0,
	out float2 OutTexCoords[6] : TEXCOORD1,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle(InPosition, InTexCoord, OutPosition, InTexCoord);
	OutTexCoordVignette.xy = InTexCoord.xy;
	OutTexCoordVignette.zw =  VignetteSpace(OutPosition.xy);

	float Start;
	float Scale;

	Start = 2.0/6.0;
	Scale = 0.66/2.0;
	Scale *= 8.0;

	OutTexCoords[0] = InTexCoord.xy + Circle(Start, 6.0, 0.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[1] = InTexCoord.xy + Circle(Start, 6.0, 1.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[2] = InTexCoord.xy + Circle(Start, 6.0, 2.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[3] = InTexCoord.xy + Circle(Start, 6.0, 3.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[4] = InTexCoord.xy + Circle(Start, 6.0, 4.0) * Scale * PostprocessInput0Size.zw;
	OutTexCoords[5] = InTexCoord.xy + Circle(Start, 6.0, 5.0) * Scale * PostprocessInput0Size.zw;
}

float3 BloomColor2;

void SunMergeSmallPS_ES2(
	float4 InUVVignette : TEXCOORD0,
	float2 InUVs[6] : TEXCOORD1,
	out half4 OutColor : SV_Target0
	)
{
	float Scale1 = 1.0/7.0;

	float Scale2 = 1.0/7.0;

	half3 Bloom1 = (
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVVignette.xy).rgb * Scale1 + 
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[0].xy).rgb * Scale2 + 
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[1].xy).rgb * Scale2 +
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[2].xy).rgb * Scale2 + 
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[3].xy).rgb * Scale2 + 
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[4].xy).rgb * Scale2 + 
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUVs[5].xy).rgb * Scale2) * rcp(Scale1 * 1.0 + Scale2 * 6.0);

	OutColor.rgb = (
		PostprocessInput1.Sample(PostprocessInput1Sampler, InUVVignette.xy).rgb * Scale1 + 
		PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[0].xy).rgb * Scale2 + 
		PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[1].xy).rgb * Scale2 +
		PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[2].xy).rgb * Scale2 + 
		PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[3].xy).rgb * Scale2 + 
		PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[4].xy).rgb * Scale2 + 
		PostprocessInput1.Sample(PostprocessInput1Sampler, InUVs[5].xy).rgb * Scale2) * rcp(Scale1 * 1.0 + Scale2 * 6.0);

	OutColor.rgb *= BloomColor2;

	OutColor.rgb += Bloom1 * BloomColor;

	// Have 5 layers on mobile (actually only 2 in this shader).
	OutColor.rgb *= 1.0/5.0;

	// Adjusting for area difference in layers vs PC.
	OutColor.rgb *= 1.0/4.0;

	half Vignette = ComputeVignetteMask(InUVVignette.zw, SunColorVignetteIntensity.a);

	OutColor.a = Vignette;
	OutColor.rgb *= OutColor.a;
}




//
// Average results of bloom/sunshaft/vignette for 2 frames (used for temporal AA).
//

void SunAvgVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float2 OutTexCoord : TEXCOORD0,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle(InPosition, InTexCoord, OutPosition, OutTexCoord);
}

void SunAvgPS_ES2(
	float2 InUV : TEXCOORD0,
	out half4 OutColor : SV_Target0
	)
{
	OutColor = 
		PostprocessInput0.Sample(PostprocessInput0Sampler, InUV.xy).rgba * 0.5 +
		PostprocessInput1.Sample(PostprocessInput1Sampler, InUV.xy).rgba * 0.5;
}



//
// Ultra simple temporal antialiasing shader which works without motion vectors.
//

float AaBlendAmount;

void AaVS_ES2(
	in float4 InPosition : ATTRIBUTE0,
	in float2 InTexCoord : ATTRIBUTE1,
	out float2 OutUV[6] : TEXCOORD0,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle(InPosition, InTexCoord, OutPosition, InTexCoord);

	// AA texture coordinates.
	float AaX = View.TemporalAAParams.x;
	// Y is flipped here in comparison with the coords in SceneVisibility (GL -y flip).
	float2 Aa1 = float2(0.5,-0.0);
	float2 Aa2 = float2(-0.0,0.5);
	if(abs(AaX) == 0.0) Aa1 = float2(-0.0,0.5);
	if(abs(AaX) == 0.0) Aa2 = float2(0.5,-0.0);
	OutUV[0] = InTexCoord.xy + (Aa1 + float2(-0.75, 0.0)) * PostprocessInput0Size.zw;
	OutUV[1] = InTexCoord.xy + (Aa1 + float2( 0.0,-0.75)) * PostprocessInput0Size.zw;
	OutUV[2] = InTexCoord.xy + Aa1 * PostprocessInput0Size.zw;
	OutUV[3] = InTexCoord.xy + (Aa1 + float2( 0.0, 0.75)) * PostprocessInput0Size.zw;
	OutUV[4] = InTexCoord.xy + (Aa1 + float2( 0.75, 0.0)) * PostprocessInput0Size.zw;
	OutUV[5] = InTexCoord.xy + Aa2 * PostprocessInput0Size.zw;
}

void AaPS_ES2(
	float2 UV[6] : TEXCOORD0,
	out half4 OutColor : SV_Target0
	)
{
	//   N
	// w M E            P = previous middle
	//   S
	half4 ColorN = PostprocessInput0.Sample(PostprocessInput0Sampler, UV[0].xy);
	half4 ColorW = PostprocessInput0.Sample(PostprocessInput0Sampler, UV[1].xy);
	half4 ColorM = PostprocessInput0.Sample(PostprocessInput0Sampler, UV[2].xy);
	half4 ColorE = PostprocessInput0.Sample(PostprocessInput0Sampler, UV[3].xy);
	half4 ColorS = PostprocessInput0.Sample(PostprocessInput0Sampler, UV[4].xy);
	half4 ColorP = PostprocessInput1.Sample(PostprocessInput1Sampler, UV[5].xy);

	half LumaN = ColorN.g;
	half LumaW = ColorW.g;
	half LumaM = ColorM.g;
	half LumaE = ColorE.g;
	half LumaS = ColorS.g;
	half LumaP = ColorP.g;

	half LumaMin = min(LumaM, min(min(LumaN, LumaS), min(LumaW, LumaE)));
	half LumaMax = max(LumaM, max(max(LumaN, LumaS), max(LumaW, LumaE)));

	// Using circle of confusion size in alpha to increase the blend between two frames.
	// Depth of field would flicker otherwise.
	half BlendAmount = saturate(min(ColorM.a, ColorP.a) * 4.0); 
	BlendAmount = max(BlendAmount * 0.5, AaBlendAmount);

	// BlendAmount = 0.5 -> Full ghosting (average of two frames).
	// BlendAmount = 0.0 -> No ghosting but lots of flicker.
	LumaMin = min(LumaM, LumaP) * BlendAmount + LumaMin * (1.0 - BlendAmount);
	LumaMax = max(LumaM, LumaP) * BlendAmount + LumaMax * (1.0 - BlendAmount);

	half LumaT = LumaM * 0.5 + LumaP * 0.5;

	LumaT = max(LumaT, LumaMin);
	LumaT = min(LumaT, LumaMax);

	half BlendFinal = saturate((LumaT - LumaM) * rcp(LumaP - LumaM));

	OutColor.rgb = lerp(ColorM.rgb, ColorP.rgb, BlendFinal);
}