GoaLitiuM/FlaxEngine
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Optimize GPU Particles simulation to perform memory buffer copies/updates before dispatch

Browse Source
This commit is contained in:
Wojtek Figat
2025-08-08 16:25:09 +02:00
parent 90d1e63b58
commit 0ea555b041
3 changed files with 68 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
Source/Engine/Particles/Particles.cpp
View File

@@ -1279,6 +1279,16 @@ void UpdateGPU(RenderTask* task, GPUContext* context)
PROFILE_MEM(Particles);
ConcurrentSystemLocker::ReadScope systemScope(Particles::SystemLocker);
// Collect valid emitter tracks to update
struct GPUSim
{
ParticleEffect* Effect;
ParticleEmitter* Emitter;
int32 EmitterIndex;
ParticleEmitterInstance& Data;
};
Array<GPUSim, RendererAllocation> sims;
sims.EnsureCapacity(Math::AlignUp(GpuUpdateList.Count(), 64)); // Preallocate with some slack
for (ParticleEffect* effect : GpuUpdateList)
{
auto& instance = effect->Instance;
@@ -1286,7 +1296,6 @@ void UpdateGPU(RenderTask* task, GPUContext* context)
if (!particleSystem || !particleSystem->IsLoaded())
continue;
// Update all emitter tracks
for (int32 j = 0; j < particleSystem->Tracks.Count(); j++)
{
const auto& track = particleSystem->Tracks[j];
@@ -1297,16 +1306,41 @@ void UpdateGPU(RenderTask* task, GPUContext* context)
if (!emitter || !emitter->IsLoaded() || emitter->SimulationMode != ParticlesSimulationMode::GPU || instance.Emitters.Count() <= emitterIndex)
continue;
ParticleEmitterInstance& data = instance.Emitters[emitterIndex];
if (!data.Buffer)
if (!data.Buffer || !emitter->GPU.CanSim(emitter, data))
continue;
ASSERT(emitter->Capacity != 0 && emitter->Graph.Layout.Size != 0);
// TODO: use async context for particles to update them on compute during GBuffer rendering
emitter->GPU.Execute(context, emitter, effect, emitterIndex, data);
sims.Add({ effect, emitter, emitterIndex, data });
}
}
GpuUpdateList.Clear();
// Pre-pass with buffers setup
{
PROFILE_CPU_NAMED("PreSim");
for (GPUSim& sim : sims)
{
sim.Emitter->GPU.PreSim(context, sim.Emitter, sim.Effect, sim.EmitterIndex, sim.Data);
}
}
// Pre-pass with buffers setup
{
PROFILE_GPU_CPU("Sim");
for (GPUSim& sim : sims)
{
sim.Emitter->GPU.Sim(context, sim.Emitter, sim.Effect, sim.EmitterIndex, sim.Data);
}
}
// Post-pass with buffers setup
{
PROFILE_CPU_NAMED("PostSim");
for (GPUSim& sim : sims)
{
sim.Emitter->GPU.PostSim(context, sim.Emitter, sim.Effect, sim.EmitterIndex, sim.Data);
}
}
context->ResetSR();
context->ResetUA();
context->FlushState();