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7b6c125e5f
- also fixing incorrect shadow length in standalone pass when it is specified in world space units #rb kenzo.terelst [CL 28317722 by tiago costa in ue5-main branch]
85 lines
2.7 KiB
Plaintext
85 lines
2.7 KiB
Plaintext
// Copyright Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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ScreenSpaceShadows.usf
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=============================================================================*/
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#include "ScreenSpaceShadowRayCast.ush"
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#include "Common.ush"
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#include "SceneTexturesCommon.ush"
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#include "ComputeShaderUtils.ush"
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#ifdef UPSAMPLE_PASS
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# include "ShadowFactorsUpsampleCommon.ush"
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#endif
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#ifndef THREADGROUP_SIZEX
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# define THREADGROUP_SIZEX 1
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#endif
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#ifndef THREADGROUP_SIZEY
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# define THREADGROUP_SIZEY 1
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#endif
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float3 LightDirection;
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float ContactShadowLength;
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uint bContactShadowLengthInWS;
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float ContactShadowCastingIntensity;
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uint DownsampleFactor;
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int4 ScissorRectMinAndSize;
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RWTexture2D<float2> RWShadowFactors;
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[numthreads(THREADGROUP_SIZEX, THREADGROUP_SIZEY, 1)]
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void ScreenSpaceShadowsCS(
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uint3 GroupId : SV_GroupID,
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uint3 DispatchThreadId : SV_DispatchThreadID,
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uint3 GroupThreadId : SV_GroupThreadID)
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{
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uint ThreadIndex = GroupThreadId.y * THREADGROUP_SIZEX + GroupThreadId.x;
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float2 ScreenUV = float2((DispatchThreadId.xy * DownsampleFactor + ScissorRectMinAndSize.xy + .5f) * View.BufferSizeAndInvSize.zw);
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float2 ScreenPosition = (ScreenUV.xy - View.ScreenPositionScaleBias.wz) / View.ScreenPositionScaleBias.xy;
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float SceneDepth = CalcSceneDepth(ScreenUV);
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float3 OpaqueTranslatedWorldPosition = mul(float4(GetScreenPositionForProjectionType(ScreenPosition, SceneDepth), SceneDepth, 1), PrimaryView.ScreenToTranslatedWorld).xyz;
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const float ContactShadowLengthScreenScale = GetTanHalfFieldOfView().y * SceneDepth;
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const float ActualContactShadowLength = ContactShadowLength * (bContactShadowLengthInWS ? 1.0f : ContactShadowLengthScreenScale);
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const float Dither = InterleavedGradientNoise(DispatchThreadId.xy + 0.5f, View.StateFrameIndexMod8);
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float2 HitUV;
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float HitDistance = CastScreenSpaceShadowRay(OpaqueTranslatedWorldPosition, LightDirection, ActualContactShadowLength, 8, Dither, 2.0f, false, HitUV);
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float Result = HitDistance > 0.0 ? (1.0f - ContactShadowCastingIntensity) : 1.0f;
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#if METAL_PROFILE
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// clamp max depth to avoid #inf
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SceneDepth = min(SceneDepth, 65500.0f);
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#endif
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RWShadowFactors[DispatchThreadId.xy] = float2(Result, SceneDepth);
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}
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#ifdef UPSAMPLE_PASS
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Texture2D ShadowFactorsTexture;
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SamplerState ShadowFactorsSampler;
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float OneOverDownsampleFactor;
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void ScreenSpaceShadowsUpsamplePS(
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in float4 SVPos : SV_POSITION,
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out float4 OutColor : SV_Target0)
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{
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float Output;
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float SceneDepth;
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UpsampleShadowFactors(SVPos, ScissorRectMinAndSize, OneOverDownsampleFactor, ShadowFactorsTexture, ShadowFactorsSampler, Output, SceneDepth);
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OutColor = EncodeLightAttenuation(half4(Output, Output, Output, Output));
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}
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#endif // UPSAMPLE_PASS
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