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Artists can still force a light function to go the fast path for such passes after ticking the visual by using the new bCompatibleWithLightFunctionAtlas bool on material. #rb Charles.deRousiers [CL 32821122 by sebastien hillaire in ue5-main branch]
87 lines
2.7 KiB
Plaintext
87 lines
2.7 KiB
Plaintext
// Copyright Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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RenderLightFunctionAtlas.usf
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=============================================================================*/
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// This define is for the light function common evaluation to only be based on UV stored in the light vector only.
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#define LIGHT_FUNCTION_ATLAS 1
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// Used to trigger shader recompiles, guid should be regenerated on merge conflicts
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#pragma message("UESHADERMETADATA_VERSION D13B08DE-2E66-447C-AF33-27D896D280CA")
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#include "../Common.ush"
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#include "/Engine/Generated/Material.ush"
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#include "../LightFunctionCommon.ush"
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float2 LightFunctionTexelSize;
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float4 SvPositionToUVScaleBias;
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void Main(
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in noperspective float4 UV : TEXCOORD0,
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in float4 SvPosition : SV_Position,
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out float4 OutColor : SV_Target0
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)
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{
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float4 TranslatedWorldPosition = float4(0, 0, 0, 1);
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float Depth = 0.000001f;
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float2 ScreenPosition = 0.0f;
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float3 LightVector = 0.0f;
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float3 LightFunction = 0.0f;
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// ScreenPosition = (SvPosition.xy * LightFunctionTexelSize - float2(0.5f, 0.5f)) * float2(2, -2);
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float2 UVs = (SvPosition.xy - SvPositionToUVScaleBias.zw) * SvPositionToUVScaleBias.xy;
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#if 1
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// Generate a local space light vector that is at least correct for point lights
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float Theta = (UVs.x * (2 * PI)) - PI;
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float Phi = UVs.y * PI;
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float SinTheta, CosTheta;
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float SinPhi, CosPhi;
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sincos(Theta, SinTheta, CosTheta);
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sincos(Phi, SinPhi, CosPhi);
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float X = CosTheta * SinPhi;
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float Y = SinTheta * SinPhi;
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float Z = CosPhi;
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LightVector = normalize(float3(X, Y, Z));
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LightFunction = GetLightFunctionColor(LightVector, TranslatedWorldPosition.xyz, UVs.xy);
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#else
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// TODO Super sample 4x
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const float2 UVOffset = 0.25f * LightFunctionTexelSize;
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LightVector.xy = UVs.xy + UVOffset * float2(-1.0f, -1.0f);
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LightFunction += GetLightFunctionColor(LightVector, TranslatedWorldPosition.xyz);
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LightVector.xy = UVs.xy + UVOffset * float2(-1.0f, 1.0f);
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LightFunction += GetLightFunctionColor(LightVector, TranslatedWorldPosition.xyz);
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LightVector.xy = UVs.xy + UVOffset * float2(1.0f, 1.0f);
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LightFunction += GetLightFunctionColor(LightVector, TranslatedWorldPosition.xyz);
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LightVector.xy = UVs.xy + UVOffset * float2(1.0f, -1.0f);
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LightFunction += GetLightFunctionColor(LightVector, TranslatedWorldPosition.xyz);
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LightFunction *= 0.25f;
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#endif
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#if COLORED_LIGHT_FUNCTION_ATLAS
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LightFunction = sqrt(max(0.0f, LightFunction)); // Simple Gamma compression
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OutColor = float4(LightFunction, 0.0f);
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#else
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float GreyScale = dot(LightFunction, .3333f).x;
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GreyScale = sqrt(max(0.0f, GreyScale)); // Simple Gamma compression
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OutColor = float4(GreyScale, 0.0f, 0.0f, 0.0f);
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#endif
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}
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