private ParticleSystem()
{
activeSpawnDetails = ParticleSpawnValues.Default;
userSpawnDetails = ParticleSpawnValues.Default;
userSpawnDetailsBuffer = ParticleSpawnValues.Default;
this.threadAction = new SystemThreadAction();
this.threadAction.system = this;
this.drawProc = new SystemDrawProc();
this.globalValues = new float[16];
}
//called on the task thread
internal void UpdateParticles()
{
List<ParticleStore> sortedList = ComputeDependantOrderForFrame();
//first time updating?
if (timeStep == 0 && this.systemLogic.OnceEmitter != null)
{
uint totalParticles = 0;
for (int i = 0; i < particleStore.Length; i++)
totalParticles += particleStore[i].Count;
if (totalParticles > 0) // special case, the OnceEmitter has created particles, need to run a processor pass first
RunProcessorLogic(sortedList);
}
//update the particle types
for (int i = 0; i < sortedList.Count; i++)
sortedList[i].Update(this, timeStep);
//spawn from here
activeSpawnDetails = this.userSpawnDetailsBuffer;
if (systemLogic.FrameEmitter != null)
systemLogic.FrameEmitter.Run(this, timeStep);
foreach (ParticleSystemTrigger trigger in this.triggers)
trigger.Run(timeStep, ref activeSpawnDetails);
foreach (ParticleSystemToggleTrigger toggle in this.toggles)
toggle.Run(timeStep, ref activeSpawnDetails);
//run the processor
RunProcessorLogic(sortedList);
for (int i = 0; i < this.particleStore.Length; i++)
this.particleStore[i].ClearTypeEmitDependance();
renderStepCount++;
timeStep++;
}
internal void GetSpawnDetails(out ParticleSpawnValues details)
{
details = activeSpawnDetails;
}
//creates the particle system storage classes (store all particle life data)
private void Initalise(ParticleSystemData systemData, Type processorType)
{
if (systemData == null)
throw new ArgumentNullException();
this.systemData = systemData;
this.enabled = true;
//build the triggers
this.triggers = new ParticleSystemTrigger[systemData.SystemLogicData.Triggers.Length];
for (int i = 0; i < this.triggers.Length; i++)
this.triggers[i] = new ParticleSystemTrigger(this, i);
this.toggles = new ParticleSystemToggleTrigger[systemData.SystemLogicData.ToggleTriggers.Length];
for (int i = 0; i < this.toggles.Length; i++)
this.toggles[i] = new ParticleSystemToggleTrigger(this, i);
this.systemLogic = systemData.SystemLogicData;
//create the storage for the particle instances
if (processorType == null)
this.particleStore = systemData.CreateParticleProfilerStore();
else
this.particleStore = systemData.CreateParticleStore(processorType);
this.particleStoreSortedDrawOrder = new List<ParticleStore>[4];
//fill with a few empty entires
for (int i = 0; i < particleStoreSortedDrawOrder.Length; i++)
particleStoreSortedDrawOrder[i] = new List<ParticleStore>(particleStore.Length);
typeDependancyList = new int[this.particleStore.Length * 2];
activeSpawnDetails = this.userSpawnDetails;
//run the 'once' emitter
if (this.systemLogic.OnceEmitter != null)
this.systemLogic.OnceEmitter.Run(this, 0);
}
//setup the shaders that copy or add particles
public int SetMoveShaderEnabled(DrawState state, GpuParticleProcessor target, GpuParticleProcessor moveSource, Vector4[] constants, ParticleSpawnValues[] initialData, int count, int startIndex)
{
if (constants != null)
{
if (constantCache == null)
{
constantCache = state.Application.UserValues[ConstantCacheName] as ConstantCache;
if (constantCache == null)
{
constantCache = new ConstantCache();
state.Application.UserValues[ConstantCacheName] = constantCache;
}
}
Vector4[] buffer = null;
int copyCount = 0;
int regCount = count;
if (initialData != null)
regCount = Math.Min(240, count * 5); //adding requires potentially lots of space
if (count > 128)
{
copyCount = Math.Min(240, regCount);
buffer = constantCache.buffer240;
}
else if (regCount > 64)
{
copyCount = Math.Min(128, regCount);
buffer = constantCache.buffer128;
}
else if (regCount > 32)
{
copyCount = Math.Min(64, regCount);
buffer = constantCache.buffer64;
}
else if (regCount > 16)
{
copyCount = Math.Min(32, regCount);
buffer = constantCache.buffer32;
}
else
{
copyCount = Math.Min(16, regCount);
buffer = constantCache.buffer16;
}
if (initialData != null)
this.enabledAddVS = true;
else
this.enabledMoveVS = true;
this.vsMoveConstants = buffer;
//write from the 7th index on
int index = ConstantCacheOffset;
if (initialData != null)
{
//initial data gets rather complex.
//the initial particle data is huge (64bytes), but often there is loads of duplicates.
//
//the constants array also doesn't use the 'y' value.
//So, the starting info will be put in a dictionary, to remove duplicates.
//Then, the y value will be used to write indices to read from.
//at this point, the copyCount value is useless.
spawnIndices.Clear();
int space = buffer.Length - index;
int written = 0;
float indexF = 0;
int endIndex = count + startIndex;
//copy as many entries as possible
copyCount = 0;
float offset = 0;
for (int i = startIndex; i < endIndex; i++)
{
float dataIndex;
if (written == space)
break;
if (!spawnIndices.TryGetValue(initialData[i], out dataIndex))
{
//have to write data
if (written + 5 > space)
break;
Vector4 value = constants[i];
value.Y = indexF;
buffer[index++] = value;
spawnIndices.Add(initialData[i], indexF);
written += 5;
indexF += 4;//value takes 4 registers
}
else
{
//this is a duplicate
Vector4 value = constants[i];
value.Y = dataIndex;
buffer[index++] = value;
written ++;
}
copyCount++;
offset++;
}
//thats as much as can be written
//fill in the details...
//offset the indices with the starting point to read from
for (int i = 0; i < copyCount; i++)
buffer[ConstantCacheOffset + i].Y += offset;
indexF = 0;
foreach (ParticleSpawnValues value in spawnIndices.Keys)
{
//this should be in logical order
if (indexF != spawnIndices[value])
throw new InvalidOperationException();
indexF += 4;
buffer[index++] = value.PositionSize;
buffer[index++] = value.VelocityRotation;
buffer[index++] = value.Colour;
buffer[index++] = value.UserValues;
}
}
else
{
for (int i = 0; i < copyCount; i++)
buffer[index++] = constants[startIndex++];
}
//write target size into index 4 XY
//write destination size into index 5 XY
moveSource = moveSource ?? target;
buffer[4] = new Vector4(target.ResolutionX, target.ResolutionY, 1.0f / target.ResolutionX, 1.0f / target.ResolutionY);
buffer[5] = new Vector4(moveSource.ResolutionX, moveSource.ResolutionY, 1.0f / moveSource.ResolutionX, 1.0f / moveSource.ResolutionY);
return copyCount;
}
else
{
this.vsMoveConstants = null;
this.enabledMoveVS = false;
this.enabledAddVS = false;
return 0;
}
}
