mirror of https://bitbucket.org/CPMADevs/cnq3
76 lines
2.8 KiB
HLSL
76 lines
2.8 KiB
HLSL
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/*
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===========================================================================
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Copyright (C) 2024 Gian 'myT' Schellenbaum
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This file is part of Challenge Quake 3 (CNQ3).
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Challenge Quake 3 is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Challenge Quake 3 is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Challenge Quake 3. If not, see <https://www.gnu.org/licenses/>.
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===========================================================================
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*/
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// volumetric lighting: sunlight shadow volume
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#include "common.hlsli"
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#include "scene_view.h.hlsli"
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cbuffer RootConstants
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{
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uint shadowTextureIndex;
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uint sourceTextureIndex;
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float shadowWorldScale;
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float sourceWorldScale;
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}
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[numthreads(8, 8, 1)]
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void cs(uint3 id : SV_DispatchThreadID)
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{
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RWTexture3D<float> shadowTexture = ResourceDescriptorHeap[shadowTextureIndex];
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uint3 shadowSize = GetTextureSize(shadowTexture);
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if(any(id.xy >= shadowSize.xy))
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{
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return;
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}
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SceneView scene = GetSceneView();
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ExtinctionCascade cascade = scene.GetExtinctionCascade(shadowWorldScale);
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float3 cameraPosition = scene.cameraPosition;
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float accumTrans = 1.0;
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if(sourceTextureIndex != 0)
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{
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SamplerState linearClampSampler = SamplerDescriptorHeap[scene.linearClampSamplerIndex];
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Texture3D<float> sourceTexture = ResourceDescriptorHeap[sourceTextureIndex];
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int3 index = int3(id.xy, -1);
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float3 destPositionSS = AABoxIndexToWorldSpace(index, cameraPosition, shadowSize, shadowWorldScale);
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float3 destPositionWS = cameraPosition + mul(scene.sunToZMatrix, destPositionSS - cameraPosition);
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float3 sourcePositionSS = cameraPosition + mul(scene.zToSunMatrix, destPositionWS - cameraPosition);
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float3 sourceSize = float3(GetTextureSize(sourceTexture));
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float3 tc = AABoxWorldSpaceToTC(sourcePositionSS, cameraPosition, sourceSize, sourceWorldScale);
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float transmittance = sourceTexture.SampleLevel(linearClampSampler, tc, 0);
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accumTrans = transmittance;
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}
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for(uint d = 0; d < shadowSize.z; d++)
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{
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uint3 index = uint3(id.xy, d);
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float3 voxelPositionSS = AABoxIndexToWorldSpace(index, cameraPosition, shadowSize, shadowWorldScale);
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float3 voxelPositionWS = cameraPosition + mul(scene.sunToZMatrix, voxelPositionSS - cameraPosition);
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float extinction = max(cascade.ExtinctionAt(voxelPositionWS), 0.0);
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float transmittance = saturate(Transmittance(shadowWorldScale, extinction));
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accumTrans *= transmittance;
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shadowTexture[index] = accumTrans;
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}
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}
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