public override void UpdatePreIntegrate(int nx)
{
if (cpuSources.Count == 0)
{
return;
}
int ns = Mathf.CeilToInt((float)gpuSourceNumber / ShaderConstants.SPAWN_BLOCKSIZE_X);
spawnShader.Dispatch(spawnHandle, ns, 1, 1);
//for profiling (forces GPU-CPU sync)
//sources.GetData(cpuSources.ToArray());
//Check to see if the GPU souces are spewing too many/too few particles
bool dirty = false;
for (int i = 0; i < sourceInfo.Count; i++)
{
if (sourceInfo[i].availableParticles < 0 && cpuSources[i].spawnPeriod > 0 ||
sourceInfo[i].availableParticles > 0 && cpuSources[i].spawnPeriod < 0)
{
ShaderConstants.Source s = cpuSources[i];
s.spawnPeriod *= -1;
cpuSources[i] = s;
dirty = true;
}
}
if (dirty)
{
syncBuffers();
}
}
/*
* Need to extend soucres so that it's a multiple of the blocksize
*/
private static ShaderConstants.Source[] extendSources(List <ShaderConstants.Source> list)
{
int length = ShaderConstants.SPAWN_BLOCKSIZE_X * Mathf.CeilToInt((float)list.Count / ShaderConstants.SPAWN_BLOCKSIZE_X);
ShaderConstants.Source[] sload = new ShaderConstants.Source[length];
for (int i = 0; i < list.Count; i++)
{
sload[i] = list[i];
}
for (int i = list.Count; i < length; i++)
{
sload[i].spawnPeriod = 0x7FFFFFFF;
}
return(sload);
}
public int AddSource(ShaderConstants.Source s, int availableParticles = 250000)
{
//Add the new source to cpu
int location = cpuSources.Count;
cpuSources.Add(s);
//Start info
sourceInfo.Add(new SourceInfo(availableParticles, Mathf.CeilToInt(pm.ParticleLifeEnd / pm.TimeStep)));
//keep track of statistics for updating available/unavailable particles
//we use update in SourceInfo to get an estimate, but that only accounts for particle death from their lifetime.
ps.ComputeModifierStatistics(ShaderConstants.PARTICLE_MODIFIER_SPAWN, location, (_, e) =>
{
sourceInfo[location].instancedParticles = ((ParticleStatisticsModifierEventArgs)e).sum[1];
sourceInfo[location].availableParticles = sourceInfo[location].totalParticles - ((ParticleStatisticsModifierEventArgs)e).sum[1];
});
syncBuffers();
return(location);
}
public void updateSource(int i, ShaderConstants.Source s)
{
cpuSources[i] = s;
syncBuffers();
}