// INIT.
private void InitSystem()
{
if (mDescriptor == null)
{
mDescriptor = new GPUParticleDescriptor();
}
mDescriptor.Update();
mMaxParticleCount = (int)Mathf.Ceil(mDescriptor.EmittFrequency * mDescriptor.Lifetime);
mLastPosition = transform.position;
sTotalParticleCount += mMaxParticleCount;
// BUFFERS.
mPositionBuffer = new SwapBuffer(2, mMaxParticleCount, sizeof(float) * 4);
mVelocityBuffer = new SwapBuffer(2, mMaxParticleCount, sizeof(float) * 4);
mLifetimeBuffer = new SwapBuffer(2, mMaxParticleCount, sizeof(float) * 4);
mColorBuffer = new ComputeBuffer(mMaxParticleCount, sizeof(float) * 4);
mHaloBuffer = new ComputeBuffer(mMaxParticleCount, sizeof(float) * 4);
mScaleBuffer = new ComputeBuffer(mMaxParticleCount, sizeof(float) * 4);
mTransperancyBuffer = new ComputeBuffer(mMaxParticleCount, sizeof(float) * 4);
{ // Set lifetime default (negative)value.
float[] arr = new float[mMaxParticleCount * 4];
for (int i = 0; i < mMaxParticleCount * 4; ++i)
{
arr[i] = -0.01f;
}
mLifetimeBuffer.GetInputBuffer().SetData(arr);
mLifetimeBuffer.GetOutputBuffer().SetData(arr);
}
// MESH.
UpdateMesh();
//LIFETIME POINT BUFFERS
// ------- Color ------
UpdateLifetimeBuffer(out mColorLifetimePointsBuffer, mDescriptor.ColorOverLifetime.Get());
// ------- Halo -------
UpdateLifetimeBuffer(out mHaloLifetimePointsBuffer, mDescriptor.HaloOverLifetime.Get());
// ------ Scale -------
UpdateLifetimeBuffer(out mScaleLifetimePointsBuffer, mDescriptor.ScaleOverLifetime.Get());
// ------ Opacity -----
UpdateLifetimeBuffer(out mTransparencyLifetimePointsBuffer, mDescriptor.OpacityOverLifetime.Get());
// COLLISION.
mSphereColliderResultBuffer = new ComputeBuffer(sMaxSphereColliderCount, sizeof(int));
}
// MERGE.
private static void Merge()
{
if (sMergedParticleCount < sTotalParticleCount)
{
sMergedParticleCount = Mathf.NextPowerOfTwo(sTotalParticleCount);
// Resize buffers.
sMergedPositionBuffer.Resize(sMergedParticleCount);
sMergedVelocityBuffer.Resize(sMergedParticleCount);
sMergedLifetimeBuffer.Resize(sMergedParticleCount);
sMergedColorBuffer.Resize(sMergedParticleCount);
sMergedHaloBuffer.Resize(sMergedParticleCount);
sMergedScaleBuffer.Resize(sMergedParticleCount);
sMergedTransperancyBuffer.Resize(sMergedParticleCount);
sSortElementSwapBuffer.Resize(sMergedParticleCount);
}
// CLEAR OLD VALUES.
// TODO: Might not need to reset all this data!!
float[] mergedData = new float[sMergedParticleCount * 4];
for (int i = 0; i < mergedData.GetLength(0); ++i)
{
mergedData[i] = -100.0f;
}
sMergedLifetimeBuffer.GetInputBuffer().SetData(mergedData);
sMergedLifetimeBuffer.GetOutputBuffer().SetData(mergedData);
for (int i = 0; i < mergedData.GetLength(0); ++i)
{
mergedData[i] = float.MaxValue;
}
sMergedPositionBuffer.GetInputBuffer().SetData(mergedData);
sMergedPositionBuffer.GetOutputBuffer().SetData(mergedData);
// SET BUFFERS.
sComputeShader.SetBuffer(sKernelMergeInitSort, "mergePositionOUT", sMergedPositionBuffer.GetOutputBuffer());
sComputeShader.SetBuffer(sKernelMergeInitSort, "mergeVelocityOUT", sMergedVelocityBuffer.GetOutputBuffer());
sComputeShader.SetBuffer(sKernelMergeInitSort, "mergeLifetimeOUT", sMergedLifetimeBuffer.GetOutputBuffer());
sComputeShader.SetBuffer(sKernelMergeInitSort, "mergeColorOUT", sMergedColorBuffer.GetOutputBuffer());
sComputeShader.SetBuffer(sKernelMergeInitSort, "mergeHaloOUT", sMergedHaloBuffer.GetOutputBuffer());
sComputeShader.SetBuffer(sKernelMergeInitSort, "mergeScaleOUT", sMergedScaleBuffer.GetOutputBuffer());
sComputeShader.SetBuffer(sKernelMergeInitSort, "mergeTransperancyOUT", sMergedTransperancyBuffer.GetOutputBuffer());
sComputeShader.SetBuffer(sKernelMergeInitSort, "gSortElementBufferOUT", sSortElementSwapBuffer.GetOutputBuffer());
Vector3 cForward = Camera.main.transform.forward;
sComputeShader.SetFloats("gCameraForward", new float[] { cForward.x, cForward.y, cForward.z });
int offset = 0;
foreach (KeyValuePair <GPUParticleSystem, GPUParticleSystem> it in sGPUParticleSystemDictionary)
{
GPUParticleSystem system = it.Value;
if (!system.gameObject.activeInHierarchy)
{
continue;
}
sComputeShader.SetInt("gLocalParticleCount", system.mMaxParticleCount);
sComputeShader.SetInt("gOffsetIndex", offset);
sComputeShader.SetBuffer(sKernelMergeInitSort, "gLocalSystemPositionIN", system.mPositionBuffer.GetOutputBuffer());
sComputeShader.SetBuffer(sKernelMergeInitSort, "gLocalSystemVelocityIN", system.mVelocityBuffer.GetOutputBuffer());
sComputeShader.SetBuffer(sKernelMergeInitSort, "gLocalSystemLifetimeIN", system.mLifetimeBuffer.GetOutputBuffer());
sComputeShader.SetBuffer(sKernelMergeInitSort, "gLocalSystemColorIN", system.mColorBuffer);
sComputeShader.SetBuffer(sKernelMergeInitSort, "gLocalSystemHaloIN", system.mHaloBuffer);
sComputeShader.SetBuffer(sKernelMergeInitSort, "gLocalSystemScaleIN", system.mScaleBuffer);
sComputeShader.SetBuffer(sKernelMergeInitSort, "gLocalSystemTransperancyIN", system.mTransperancyBuffer);
sComputeShader.Dispatch(sKernelMergeInitSort, (int)Mathf.Ceil(system.mMaxParticleCount / 64.0f), 1, 1);
offset += system.mMaxParticleCount;
}
}
// EMITT UPDATE.
private void EmittUpdate()
{
// Update timer.
mEmittTimer += Time.deltaTime;
int emittCount = (int)(mDescriptor.EmittFrequency * mEmittTimer);
if (emittCount == 0)
{
return;
}
mEmittTimer -= emittCount * 1.0f / mDescriptor.EmittFrequency;
Vector3 emitterVelocity = transform.position - mLastPosition;
int particlesToEmitt = emittCount;
int batchCount = (int)Mathf.Ceil(emittCount / 64.0f);
for (int batchID = 0; batchID < batchCount; ++batchID)
{
int emittCountThisBatch = particlesToEmitt > 64 ? 64 : particlesToEmitt;
//Debug.Log(emittCountThisBatch);
particlesToEmitt -= 64;
sComputeShader.SetInt("gEmittCountThisBatch", emittCountThisBatch);
// BIND PARTICLE BUFFERS.
sComputeShader.SetBuffer(sKernelEmitt, "gPositionBuffer", mPositionBuffer.GetOutputBuffer());
sComputeShader.SetBuffer(sKernelEmitt, "gVelocityBuffer", mVelocityBuffer.GetOutputBuffer());
sComputeShader.SetBuffer(sKernelEmitt, "gLifetimeBuffer", mLifetimeBuffer.GetOutputBuffer());
// Inherit velocity from emitter if true.
Vector3 velocity = (emitterVelocity / Time.deltaTime) * (mDescriptor.InheritVelocity ? 1 : 0) + mDescriptor.InitialVelocity;
// EMITT INFO.
sComputeShader.SetInt("gEmittStartIndex", mEmittIndex);
sComputeShader.SetInt("gEmittMaxCount", mMaxParticleCount);
sComputeShader.SetFloats("gPosition", new float[] { transform.position.x, transform.position.y, transform.position.z });
sComputeShader.SetFloats("gVelocity", new float[] { velocity.x, velocity.y, velocity.z });
sComputeShader.SetFloats("gLifetime", new float[] { mDescriptor.Lifetime });
// EMITT MESH.
if (mDescriptor.EmittMesh == null)
{
// Set count to 0.
sComputeShader.SetInt("gEmittMeshVertexCount", 0);
sComputeShader.SetInt("gEmittMeshIndexCount", 0);
sComputeShader.SetInt("gEmittMeshRandomIndex", 0);
}
else
{
Debug.Assert(sEmittMeshInfoDictionary.ContainsKey(mDescriptor.EmittMesh));
EmittMeshInfo emittMeshInfo = sEmittMeshInfoDictionary[mDescriptor.EmittMesh];
// Set index and vertex buffer.
sComputeShader.SetBuffer(sKernelEmitt, "gEmittMeshVertexBuffer", emittMeshInfo.mVertexBuffer);
sComputeShader.SetBuffer(sKernelEmitt, "gEmittMeshIndexBuffer", emittMeshInfo.mIndexBuffer);
sComputeShader.SetInt("gEmittMeshVertexCount", emittMeshInfo.mVertexCount);
sComputeShader.SetInt("gEmittMeshIndexCount", emittMeshInfo.mIndexCount);
int[] randomIndexArray = new int[64];
for (int j = 0; j < randomIndexArray.GetLength(0); ++j)
{
randomIndexArray[j] = Random.Range(0, emittMeshInfo.mIndexCount - 1);
}
sRandomIndexBuffer.SetData(randomIndexArray);
sComputeShader.SetBuffer(sKernelEmitt, "gEmittMeshRandomIndexBuffer", sRandomIndexBuffer);
sComputeShader.SetFloats("gEmittMeshScale", new float[] { transform.localScale.x, transform.localScale.y, transform.localScale.z });
}
// DISPATCH.
sComputeShader.Dispatch(sKernelEmitt, 1, 1, 1);
// Increment emitt index.
mEmittIndex = (mEmittIndex + emittCountThisBatch) % mMaxParticleCount;
}
}
/// <summary>
/// Kills all living particles.
/// </summary>
public static void KillAllParticles()
{
Debug.Log("KILLALLPARTILCES1");
if (sGPUParticleSystemDictionary == null)
{
return;
}
foreach (KeyValuePair <GPUParticleSystem, GPUParticleSystem> it in sGPUParticleSystemDictionary)
{
Debug.Log("KILLALLPARTILCES2");
GPUParticleSystem system = it.Value;
float[] systemData = new float[system.mMaxParticleCount * 4];
for (int i = 0; i < systemData.GetLength(0); ++i)
{
systemData[i] = -100.0f;
}
system.mLifetimeBuffer.GetInputBuffer().SetData(systemData);
system.mLifetimeBuffer.GetOutputBuffer().SetData(systemData);
for (int i = 0; i < systemData.GetLength(0); ++i)
{
systemData[i] = float.MaxValue;
}
system.mPositionBuffer.GetInputBuffer().SetData(systemData);
system.mPositionBuffer.GetOutputBuffer().SetData(systemData);
int[] r = new int[sMaxGPUColliderCount];
for (int i = 0; i < r.GetLength(0); ++i)
{
r[i] = 0;
}
system.mSphereColliderResultBuffer.SetData(r);
}
// TODO: Might not need to reset all this data!!
float[] mergedData = new float[sMergedParticleCount * 4];
for (int i = 0; i < mergedData.GetLength(0); ++i)
{
mergedData[i] = -100.0f;
}
sMergedLifetimeBuffer.GetInputBuffer().SetData(mergedData);
sMergedLifetimeBuffer.GetOutputBuffer().SetData(mergedData);
for (int i = 0; i < mergedData.GetLength(0); ++i)
{
mergedData[i] = float.MaxValue;
}
sMergedPositionBuffer.GetInputBuffer().SetData(mergedData);
sMergedPositionBuffer.GetOutputBuffer().SetData(mergedData);
int[] data = new int[sMaxGPUColliderCount];
for (int i = 0; i < data.GetLength(0); ++i)
{
data[i] = 0;
}
sGPUColliderResultSwapBuffer.GetInputBuffer().SetData(data);
sGPUColliderResultSwapBuffer.GetOutputBuffer().SetData(data);
}