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89 lines
2.9 KiB
Plaintext
89 lines
2.9 KiB
Plaintext
/*
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* Copyright (c) Contributors to the Open 3D Engine Project.
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* For complete copyright and license terms please see the LICENSE at the root of this distribution.
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*
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* SPDX-License-Identifier: Apache-2.0 OR MIT
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*
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*/
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#include <Atom/Features/Shadow/Shadow.azsli>
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#include <Atom/Features/Math/Filter.azsli>
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#include <Atom/Features/Shadow/ShadowmapAtlasLib.azsli>
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#include <Atom/Features/SrgSemantics.azsli>
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#include <Atom/RPI/Math.azsli>
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static const uint MaxCascadeCount = 4;
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option enum class ShadowmapLightType
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{
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Directional,
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Spot
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}
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o_shadowmapLightType = ShadowmapLightType::Directional;
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ShaderResourceGroup PassSrg : SRG_PerPass_WithFallback
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{
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Texture2DArray<float> m_inputShadowmap;
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RWTexture2DArray<float> m_outputShadowmap;
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Buffer<uint2> m_shadowmapIndexTable;
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StructuredBuffer<FilterParameter> m_filterParameters;
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}
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[numthreads(16,16,1)]
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void MainCS(uint3 dispatchId: SV_DispatchThreadID)
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{
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const float3 inputSize = GetImageSize(PassSrg::m_inputShadowmap);
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const float3 outputSize = GetImageSize(PassSrg::m_outputShadowmap);
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const float depthInClip = PassSrg::m_inputShadowmap[dispatchId].r;
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const uint shadowmapIndex = GetShadowmapIndex(
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PassSrg::m_shadowmapIndexTable,
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dispatchId,
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inputSize.x);
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if (shadowmapIndex == ~0)
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{
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return; // Early return if it is outside of shadowmaps.
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}
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const FilterParameter filterParameter = PassSrg::m_filterParameters[shadowmapIndex];
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if (!filterParameter.m_isEnabled)
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{
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return; // Early return if filter is disabled.
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}
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switch (o_shadowmapLightType)
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{
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case ShadowmapLightType::Directional:
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{
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const float distanceMin = filterParameter.m_lightDistanceOfCameraViewFrustum;
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// When the light origin is far from the camera view frustum,
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// the difference of "depthInClip" in the frustum is so small,
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// and it often causes light bleeding with ESM.
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// So this converts it to "depth" to emphasize the difference
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// within the frustum.
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const float depth = (depthInClip - distanceMin) / (1. - distanceMin);
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PassSrg::m_outputShadowmap[dispatchId].r = depth;
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break;
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}
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case ShadowmapLightType::Spot:
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{
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const float3 coefficients = float3(
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filterParameter.m_n_f_n,
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filterParameter.m_n_f,
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filterParameter.m_f);
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// With a spot light shadowmap, "depthInClip" is calculated
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// as a perspective depth, not a orthogonal one.
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// So the values are concentrated to near 1.0,
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// and it often causes light bleeding with ESM.
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// So this converts it to a linear depth to emphasize the
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// difference like a orthogonal depth.
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PassSrg::m_outputShadowmap[dispatchId].r = PerspectiveDepthToLinear(depthInClip, coefficients);
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break;
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}
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}
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}
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