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30 lines
1.2 KiB
Plaintext
30 lines
1.2 KiB
Plaintext
// Copyright 1998-2014 Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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DownSampleDepthPixelShader.usf: Downsamples scene depth by a factor of 2.
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=============================================================================*/
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#include "Common.usf"
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float2 ProjectionScaleBias;
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float4 SourceTexelOffsets01;
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float4 SourceTexelOffsets23;
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void Main(
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float2 InUV : TEXCOORD0,
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out float OutDepth : SV_DEPTH,
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out float4 OutColor : SV_Target0
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)
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{
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// Lookup the four view space Z's of the full resolution pixels corresponding to this low resolution pixel
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float ViewSpaceZ0 = CalcSceneDepth(InUV + SourceTexelOffsets01.xy);
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float ViewSpaceZ1 = CalcSceneDepth(InUV + SourceTexelOffsets01.zw);
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float ViewSpaceZ2 = CalcSceneDepth(InUV + SourceTexelOffsets23.xy);
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float ViewSpaceZ3 = CalcSceneDepth(InUV + SourceTexelOffsets23.zw);
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// Use the furthest depth to shrink foreground object silhouettes
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float FurthestDepth = max(max(ViewSpaceZ0, ViewSpaceZ1), max(ViewSpaceZ2, ViewSpaceZ3));
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// Convert view space Z into post projection Z and output post projection Z / W as the depth buffer expects.
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OutDepth = (FurthestDepth * ProjectionScaleBias.x + ProjectionScaleBias.y) / FurthestDepth;
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OutColor = 0;
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}
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