public ModelInstanceHandle AllocateInstance(uint materialIndex, uint modelIndex, uint sceneLayerIndex, Transform initialTransform)
{
using (RenderingModule.RenderStateBarrier.AcquirePermit(withLock: instanceMutationLock)) {
MIDArray midArray = materialMap.GetOrCreate(materialIndex, createNewMIDArrayAct);
ModelInstanceData *data = midArray.Data;
for (uint i = midArray.Length - 1U; i < midArray.Length; --i)
{
if (!data[i].InUse)
{
data[i] = new ModelInstanceData(modelIndex, sceneLayerIndex, initialTransform);
return(new ModelInstanceHandle(this, materialIndex, i));
}
}
// MIDArray is full, so resize...
uint newSize = midArray.Length << 1;
uint numBytes = (uint)sizeof(ModelInstanceData) * newSize;
uint oldNumBytes = (uint)sizeof(ModelInstanceData) * midArray.Length;
if (midArray.Length >= MAX_SIZE_BEFORE_LINEAR_GROWTH)
{
newSize = midArray.Length + LINEAR_GROWTH_AMOUNT;
}
ModelInstanceData *newData = (ModelInstanceData *)Marshal.AllocHGlobal(new IntPtr(numBytes));
UnsafeUtils.MemCopy((IntPtr)data, (IntPtr)newData, oldNumBytes);
Marshal.FreeHGlobal((IntPtr)data);
UnsafeUtils.ZeroMem(((IntPtr)newData) + (int)oldNumBytes, numBytes - oldNumBytes);
materialMap[materialIndex] = new MIDArray(newData, newSize);
newData[midArray.Length] = new ModelInstanceData(modelIndex, sceneLayerIndex, initialTransform);
return(new ModelInstanceHandle(this, materialIndex, midArray.Length));
}
}
private static IntPtr AllocAndZeroTemp(uint numBytes)
{
IntPtr result = RenderCommandTempMemPool.GetLocalPool().Reserve(numBytes);
UnsafeUtils.ZeroMem(result, numBytes);
return(result);
}
private MIDArray CreateNewMIDArray(uint materialIndex)
{
uint numBytes = (uint)sizeof(ModelInstanceData) * INITIAL_INSTANCE_ALLOCATION;
ModelInstanceData *data = (ModelInstanceData *)Marshal.AllocHGlobal(new IntPtr(numBytes));
UnsafeUtils.ZeroMem((IntPtr)data, numBytes);
return(new MIDArray(data, INITIAL_INSTANCE_ALLOCATION));
}
