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https://bitbucket.org/CPMADevs/cnq3
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afc81437c3
- added the foundation for a GPU particle system - reworked volumetric particle injection
85 lines
2.9 KiB
HLSL
85 lines
2.9 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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// volumetric lighting particles: create final live particle index array
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#include "common.hlsli"
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#include "vl_common.h.hlsli"
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#include "scene_view.h.hlsli"
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cbuffer RootConstants
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{
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uint3 fullResolution;
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uint emitterIndex;
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uint3 tileResolution;
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uint maxParticleIndexCount;
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uint3 tileScale;
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uint tileBufferIndex;
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uint emitterBufferIndex;
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uint particleBufferIndex;
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uint liveBufferIndex;
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uint indexBufferIndex;
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}
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[numthreads(64, 1, 1)]
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void cs(uint3 id : SV_DispatchThreadID)
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{
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RWStructuredBuffer<ParticleEmitter> emitterBuffer = ResourceDescriptorHeap[emitterBufferIndex];
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ParticleEmitter emitter = emitterBuffer[emitterIndex];
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if(id.x >= emitter.liveCount2)
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{
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return;
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}
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RWStructuredBuffer<Particle> particleBuffer = ResourceDescriptorHeap[particleBufferIndex];
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RWStructuredBuffer<Tile> tileBuffer = ResourceDescriptorHeap[tileBufferIndex];
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RWStructuredBuffer<uint> liveBuffer = ResourceDescriptorHeap[liveBufferIndex];
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RWStructuredBuffer<uint> indexBuffer = ResourceDescriptorHeap[indexBufferIndex];
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SceneView scene = GetSceneView();
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uint firstIndex = emitter.firstIndex;
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uint particleIndex = liveBuffer[firstIndex + id.x];
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Particle particle = particleBuffer[firstIndex + particleIndex];
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int3 boxMin = particle.froxelMin / int3(tileScale);
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int3 boxMax = particle.froxelMax / int3(tileScale);
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boxMin = max(boxMin, int3(0, 0, 0));
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boxMax = min(boxMax, int3(tileResolution) - int3(1, 1, 1));
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for(int x = boxMin.x; x <= boxMax.x; x++)
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{
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for(int y = boxMin.y; y <= boxMax.y; y++)
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{
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for(int z = boxMin.z; z <= boxMax.z; z++)
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{
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uint3 tileIndex = uint3(x, y, z);
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uint flatTileIndex = FlattenIndex(tileIndex, tileResolution);
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uint particleWriteOffset;
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InterlockedAdd(tileBuffer[flatTileIndex].particleIndex, 1, particleWriteOffset);
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uint particleWriteIndex = tileBuffer[flatTileIndex].firstParticle + particleWriteOffset;
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if(particleWriteOffset < tileBuffer[flatTileIndex].particleCount &&
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particleWriteIndex < maxParticleIndexCount)
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{
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indexBuffer[particleWriteIndex] = firstIndex + particleIndex;
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}
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}
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}
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}
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}
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