mirror of https://bitbucket.org/CPMADevs/cnq3
105 lines
3.0 KiB
HLSL
105 lines
3.0 KiB
HLSL
/*
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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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// denoising direct lighting from dynamic lights
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#include "common.hlsli"
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#include "fullscreen.hlsli"
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#include "scene_view.h.hlsli"
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cbuffer RootConstants
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{
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float3 lightPosition;
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uint textureIndex;
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uint vshadowTextureIndex;
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uint vshadowSamplerIndex;
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float vshadowWorldScale;
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};
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float4 ps(VOut input) : SV_Target
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{
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SceneView scene = GetSceneView();
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Texture2D shadingPositionTexture = ResourceDescriptorHeap[scene.shadingPositionTextureIndex];
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Texture2D texture0 = ResourceDescriptorHeap[textureIndex];
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Texture3D<float> vshadowTexture = ResourceDescriptorHeap[vshadowTextureIndex];
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SamplerState vshadowSampler = SamplerDescriptorHeap[vshadowSamplerIndex];
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int2 textureMax = GetTextureSize(texture0) - int2(1, 1);
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int2 tcFrag = int2(input.position.xy);
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float3 positionFrag = shadingPositionTexture.Load(uint3(tcFrag, 0)).xyz;
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float distThreshold = 8.0;
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float maxError = 0.0;
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for(int y = -4; y <= 4; y++)
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{
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for(int x = -4; x <= 4; x++)
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{
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int2 tc = tcFrag + int2(x, y);
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if(!IsInRange(tcFrag, int2(0, 0), textureMax))
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{
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continue;
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}
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uint3 tc3 = uint3(tc, 0);
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float errorFrag = texture0.Load(tc3).w;
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maxError = max(maxError, errorFrag);
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}
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}
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maxError = saturate(maxError);
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float3 accum = float3(0, 0, 0);
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float weightSum = 0.0;
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int blurRadius = 1 + int(maxError * 8.0);
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for(int y = -blurRadius; y <= blurRadius; y++)
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{
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for(int x = -blurRadius; x <= blurRadius; x++)
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{
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int2 tc = tcFrag + int2(x, y);
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if(!IsInRange(tcFrag, int2(0, 0), textureMax))
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{
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continue;
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}
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uint3 tc3 = uint3(tc, 0);
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float3 positionSample = shadingPositionTexture.Load(tc3).xyz;
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float3 colorSample = texture0.Load(tc3).rgb;
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float posWeight = 1.0 - saturate(distance(positionSample, positionFrag) / distThreshold);
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float weight = posWeight;
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accum += colorSample * posWeight;
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weightSum += weight;
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}
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}
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if(weightSum > 0.0)
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{
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accum /= weightSum;
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}
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float3 vshadowTC = AABoxWorldSpaceToTC(positionFrag, lightPosition, GetTextureSize(vshadowTexture), vshadowWorldScale);
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float transmittance = vshadowTexture.SampleLevel(vshadowSampler, vshadowTC, 0);
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accum *= transmittance;
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float4 result = float4(accum, 0);
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return result;
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}
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