public void Prepare(bool parallel)
{
if (Interlocked.Exchange(ref State, State_Preparing) != State_Initialized)
{
throw new InvalidOperationException("Frame was not in initialized state when prepare operation began ");
}
if (false)
{
var totalBatches = Batch.LifetimeCount - InitialBatchCount;
Console.WriteLine("Frame contains {0} batches", totalBatches);
}
BatchCombiner.CombineBatches(Batches);
#if PSM
Batches.Timsort(BatchComparer);
#else
Batches.Sort(BatchComparer);
#endif
if (!Monitor.TryEnter(PrepareLock, 5000))
{
throw new InvalidOperationException("Spent more than five seconds waiting for a previous prepare operation.");
}
try {
if (parallel)
{
RenderManager.ParallelPrepare(this);
}
else
{
PrepareSubset(0, Batches.Count);
}
} finally {
Monitor.Exit(PrepareLock);
}
if (Interlocked.Exchange(ref State, State_Prepared) != State_Preparing)
{
throw new InvalidOperationException("Frame was not in preparing state when prepare operation completed");
}
}
/// <summary>
/// Scans over a list of batches and applies batch combiners to reduce the total number of batches sent to the GPU and
/// improve batch preparation efficiency. Batches eliminated by combination are replaced with null.
/// </summary>
/// <param name="batches">The list of batches to perform a combination pass over.</param>
/// <returns>The number of batches eliminated.</returns>
public static int CombineBatches(UnorderedList <Batch> batches)
{
#if PSM
batches.Timsort(BatchTypeSorter);
#else
batches.Sort(BatchTypeSorter);
#endif
int i = 0, j = i + 1, l = batches.Count, eliminatedCount = 0;
Batch a, b;
Type aType, bType;
var _batches = batches.GetBuffer();
while ((i < l) && (j < l))
{
a = _batches[i];
if (a == null)
{
i += 1;
j = i + 1;
continue;
}
aType = a.GetType();
b = _batches[j];
if (b == null)
{
j += 1;
continue;
}
bType = b.GetType();
if ((aType != bType) || (a.Layer != b.Layer))
{
i = j;
j = i + 1;
}
else
{
bool combined = false;
foreach (var combiner in Combiners)
{
if (combined = combiner.CanCombine(a, b))
{
_batches[i] = _batches[j] = null;
_batches[i] = combiner.Combine(a, b);
_batches[i].Container = a.Container;
if ((a != _batches[i]) && (a.ReleaseAfterDraw))
{
a.ReleaseResources();
}
if (b.ReleaseAfterDraw)
{
b.ReleaseResources();
}
eliminatedCount += 1;
break;
}
}
j += 1;
}
}
if (false && eliminatedCount > 0)
{
Console.WriteLine("Eliminated {0:0000} of {1:0000} batch(es)", eliminatedCount, batches.Count);
}
return(eliminatedCount);
}