49 lines
2.1 KiB
Plaintext
49 lines
2.1 KiB
Plaintext
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#pragma kernel UpdateParticleStrip
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#pragma only_renderers d3d11 playstation xboxone xboxseries vulkan metal switch glcore gles3 webgpu
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#include "HLSLSupport.cginc"
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#define NB_THREADS_PER_GROUP 64
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#define VFX_USE_INSTANCING 1
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#define VFX_INSTANCING_BATCH_INDIRECTION 1
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#define VFX_INSTANCING_FIXED_SIZE stripCount
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#define STRIP_COUNT stripCount
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CBUFFER_START(params)
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uint dispatchWidth;
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uint stripCount;
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uint particlePerStripCount;
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float4 instancingConstants;
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CBUFFER_END
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#include "VFXInstancing.hlsl"
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RWStructuredBuffer<uint> stripDataBuffer;
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#include "Packages/com.unity.visualeffectgraph/Shaders/VFXParticleStripCommon.hlsl"
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[numthreads(NB_THREADS_PER_GROUP,1,1)]
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void UpdateParticleStrip(uint3 groupId : SV_GroupID,
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uint3 groupThreadId : SV_GroupThreadID)
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{
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uint index = groupThreadId.x + groupId.x * NB_THREADS_PER_GROUP + groupId.y * dispatchWidth * NB_THREADS_PER_GROUP;
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if (index < stripCount * (uint)instancingActiveCount)
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{
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uint instanceIndex, instanceActiveIndex, instanceCurrentIndex;
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uint stripIndex = VFXInitInstancing(index, instanceIndex, instanceActiveIndex, instanceCurrentIndex);
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uint bufferIndex = STRIP_DATA_INDEX(instanceIndex, stripIndex);
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bool isEmpty = (STRIP_DATA(STRIP_MIN_ALIVE, bufferIndex) & ~1) == ~1;
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uint particleCount = isEmpty ? 0 : STRIP_DATA(STRIP_MAX_ALIVE, bufferIndex) - STRIP_DATA(STRIP_MIN_ALIVE, bufferIndex) + 1;
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STRIP_DATA(STRIP_FIRST_INDEX, bufferIndex) = isEmpty ? 0 : (STRIP_DATA(STRIP_FIRST_INDEX, bufferIndex) + STRIP_DATA(STRIP_MIN_ALIVE, bufferIndex)) % particlePerStripCount;
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STRIP_DATA(STRIP_NEXT_INDEX, bufferIndex) = particleCount;
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STRIP_DATA(STRIP_PREV_NEXT_INDEX, bufferIndex) = particleCount; // Store particle count twice so that it can be read consistenly in next Init (as next index will be atomically incremented in init)
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STRIP_DATA(STRIP_MIN_ALIVE, bufferIndex) = isEmpty ? ~1 : ~0;
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STRIP_DATA(STRIP_MAX_ALIVE, bufferIndex) = 0;
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InterlockedAdd(STRIP_PARTICLE_COUNTER(instanceIndex), particleCount);
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}
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}
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