public ObjectUsage <T> Get(UsageType usage)
{
switch (usage)
{
case UsageType.Write:
lock (buffers)
{
while (buffers[write]?.Usage == UsageType.Read || write == lastWrite)
{
write = (write + 1) % 3;
}
}
if (buffers[write] == null)
{
buffers[write] = new ObjectUsage <T>
{
Finish = finishDelegate,
Usage = UsageType.Write,
Index = write,
};
}
else
{
buffers[write].Usage = UsageType.Write;
}
buffers[write].FrameId = Interlocked.Increment(ref currentFrame);
return(buffers[write]);
case UsageType.Read:
if (lastWrite < 0)
{
return(null);
}
lock (buffers)
{
read = lastWrite;
buffers[read].Usage = UsageType.Read;
}
return(buffers[read]);
}
return(null);
}
private void finish(ObjectUsage <T> obj, UsageType type)
{
switch (type)
{
case UsageType.Read:
lock (buffers)
buffers[read].Usage = UsageType.None;
break;
case UsageType.Write:
lock (buffers)
{
buffers[write].Usage = UsageType.None;
lastWrite = write;
}
break;
}
}