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33de443ce8
Switched clear coat material outputs to CustomData with renaming. First pass. Code needs clean up. BRDF needs optimization. Only works well with directional lights. Point lights don't obey opacity during shadow projection. No solution yet for indirect. [CL 2688556 by Brian Karis in Main branch]
101 lines
4.1 KiB
Plaintext
101 lines
4.1 KiB
Plaintext
// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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DeferredLightPixelShaders.usf:
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=============================================================================*/
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#include "Common.usf"
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#include "DeferredShadingCommon.usf"
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#include "DeferredLightingCommon.usf"
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float4 GetPerPixelLightAttenuation(float2 UV)
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{
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return Square(Texture2DSampleLevel(LightAttenuationTexture, LightAttenuationTextureSampler, UV, 0));
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}
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FDeferredLightData SetupLightDataForStandardDeferred()
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{
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// Build the light data struct using the DeferredLightUniforms and light defines
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// We are heavily relying on the shader compiler to optimize out constant subexpressions in GetDynamicLighting()
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FDeferredLightData LightData;
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LightData.LightPositionAndInvRadius = float4(DeferredLightUniforms.LightPosition, DeferredLightUniforms.LightInvRadius);
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LightData.LightColorAndFalloffExponent = float4(DeferredLightUniforms.LightColor, DeferredLightUniforms.LightFalloffExponent);
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LightData.LightDirection = DeferredLightUniforms.NormalizedLightDirection;
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LightData.SpotAnglesAndSourceRadius = float4(DeferredLightUniforms.SpotAngles, DeferredLightUniforms.SourceRadius, DeferredLightUniforms.SourceLength);
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LightData.MinRoughness = DeferredLightUniforms.MinRoughness;
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LightData.DistanceFadeMAD = DeferredLightUniforms.DistanceFadeMAD;
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LightData.ShadowMapChannelMask = DeferredLightUniforms.ShadowMapChannelMask;
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LightData.bInverseSquared = INVERSE_SQUARED_FALLOFF;
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LightData.bRadialLight = RADIAL_ATTENUATION;
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//@todo - permutation opportunity
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LightData.bSpotLight = RADIAL_ATTENUATION;
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//@todo - permutation opportunity
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LightData.bShadowed = DeferredLightUniforms.bShadowed;
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return LightData;
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}
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/**
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* Pixel shader for rendering a directional light using a full screen quad.
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*/
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void DirectionalPixelMain(
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float2 InUV : TEXCOORD0,
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float3 ScreenVector : TEXCOORD1,
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float4 SVPos : SV_POSITION,
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out float4 OutColor : SV_Target0
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)
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{
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OutColor = 0;
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float3 CameraVector = normalize(ScreenVector);
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FScreenSpaceData ScreenSpaceData = GetScreenSpaceData(InUV);
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// Only light pixels marked as using deferred shading
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BRANCH if( ScreenSpaceData.GBuffer.ShadingModelID > 0 )
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{
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float SceneDepth = CalcSceneDepth(InUV);
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float3 WorldPosition = ScreenVector * SceneDepth + View.WorldCameraOrigin;
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FDeferredLightData LightData = SetupLightDataForStandardDeferred();
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uint2 Random = ScrambleTEA( uint2( SVPos.xy ) );
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Random.x ^= View.Random;
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Random.y ^= View.Random;
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OutColor = GetDynamicLighting(WorldPosition, CameraVector, InUV, ScreenSpaceData, ScreenSpaceData.GBuffer.ShadingModelID, LightData, GetPerPixelLightAttenuation(InUV), Random);
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}
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}
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/**
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* Pixel shader for rendering a point or spot light using approximate bounding geometry.
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*/
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void RadialPixelMain(
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float4 InScreenPosition : TEXCOORD0,
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float4 SVPos : SV_POSITION,
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out float4 OutColor : SV_Target0
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)
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{
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OutColor = 0;
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float2 ScreenUV = InScreenPosition.xy / InScreenPosition.w * View.ScreenPositionScaleBias.xy + View.ScreenPositionScaleBias.wz;
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FScreenSpaceData ScreenSpaceData = GetScreenSpaceData(ScreenUV);
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// Only light pixels marked as using deferred shading
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BRANCH if( ScreenSpaceData.GBuffer.ShadingModelID > 0 )
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{
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float SceneDepth = CalcSceneDepth(ScreenUV);
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float4 HomogeneousWorldPosition = mul(float4(InScreenPosition.xy / InScreenPosition.w * SceneDepth, SceneDepth, 1), View.ScreenToWorld);
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float3 WorldPosition = HomogeneousWorldPosition.xyz / HomogeneousWorldPosition.w;
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float3 CameraVector = normalize(WorldPosition - View.WorldCameraOrigin);
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FDeferredLightData LightData = SetupLightDataForStandardDeferred();
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uint2 Random = ScrambleTEA( uint2( SVPos.xy ) );
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Random.x ^= View.Random;
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Random.y ^= View.Random;
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OutColor = GetDynamicLighting(WorldPosition, CameraVector, ScreenUV, ScreenSpaceData, ScreenSpaceData.GBuffer.ShadingModelID, LightData, GetPerPixelLightAttenuation(ScreenUV), Random);
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OutColor *= ComputeLightProfileMultiplier(WorldPosition, DeferredLightUniforms.LightPosition, DeferredLightUniforms.NormalizedLightDirection);
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}
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} |