public static IndexedMesh Optimize(IMesh mesh)
{
var result = new IndexedMesh(mesh.Id);
var resultPrimitives = new IndexMeshPrimitive[mesh.Primitives.Count];
var primitiveGroups = mesh.GroupPrimitives();
foreach (var primitiveGroup in primitiveGroups)
{
var resultBufferView = new MeshBufferView();
var bufferView = primitiveGroup.BufferView;
var streamKeys = bufferView.GetStreams().ToList();
var sourceStreams = streamKeys.Select(x => bufferView.GetStream(x)).ToList();
var dictionaryStreams = sourceStreams.Select(_ => _.CreateDictionaryMeshStreamOfTheSameType()).ToList();
for (var index = 0; index < dictionaryStreams.Count; index++)
{
resultBufferView.SetStream(streamKeys[index], dictionaryStreams[index]);
}
foreach (var primitiveAndIndex in primitiveGroup.Primitives)
{
var meshPrimitive = new IndexMeshPrimitive(resultBufferView);
resultPrimitives[primitiveAndIndex.Index] = meshPrimitive;
var submesh = primitiveAndIndex.Primitive;
meshPrimitive.Topology = submesh.Topology;
for (var keyIndex = 0; keyIndex < streamKeys.Count; ++keyIndex)
{
var key = streamKeys[keyIndex];
var sourceIndices = submesh.GetIndexReader(key);
var dataStream = dictionaryStreams[keyIndex];
var sourceStream = sourceStreams[keyIndex];
var stream = new List <int>(sourceIndices.Count);
for (var i = 0; i < sourceIndices.Count; ++i)
{
stream.Add(dataStream.Add(sourceStream[sourceIndices[i]]));
}
meshPrimitive.SetIndexStream(key, stream);
}
}
for (var keyIndex = 0; keyIndex < streamKeys.Count; ++keyIndex)
{
bufferView.SetStream(streamKeys[keyIndex], dictionaryStreams[keyIndex]);
}
}
foreach (var indexMeshPrimitive in resultPrimitives)
{
result.Primitives.Add(indexMeshPrimitive);
}
return(result);
}
public static GpuMesh Optimize(IMesh source)
{
var optimalIndexedMesh = IndexedMesh.Optimize(source);
var resultPrimitives = new GpuPrimitive[optimalIndexedMesh.Primitives.Count];
var result = new GpuMesh(source.Id);
var indices = new List <int>();
foreach (var primitiveGroup in optimalIndexedMesh.GroupPrimitives())
{
var sourceBuffer = primitiveGroup.BufferView;
var gpuBufferView = new MeshBufferView();
var streamKeys = sourceBuffer.GetStreams();
var copiers = streamKeys.Project((streamKey, streamIndex) =>
{
var meshStream = sourceBuffer.GetStream(streamKey);
var destination = meshStream.CreateListMeshStreamOfTheSameType();
gpuBufferView.SetStream(streamKey, destination);
return(new BoxingtMeshStreamCopier(meshStream, destination));
});
var expectedCapacityEsitmation =
primitiveGroup.Select(_ => _.GetIndexReader(StreamKey.Position).Count).Sum() * streamKeys.Count;
indices.Clear();
if (indices.Capacity < expectedCapacityEsitmation)
{
indices.Capacity = expectedCapacityEsitmation;
}
var vertexMap = new Dictionary <IndexSet, int>();
foreach (var primitiveAndIndex in primitiveGroup.Primitives)
{
var primitive = primitiveAndIndex.Primitive;
var setReader = new IndexSetReader(indices, streamKeys, primitive);
var ints = primitive.GetIndexReader(StreamKey.Position);
var gpuIndices = new List <int>();
for (var index = 0; index < ints.Count; index++)
{
var set = setReader.Read(index);
if (vertexMap.TryGetValue(set, out var vertexIndex))
{
setReader.Position = set.Offset;
}
else
{
for (var streamIndex = 0; streamIndex < streamKeys.Count; streamIndex++)
{
vertexIndex = copiers[streamIndex].Copy(set[streamIndex]);
}
vertexMap.Add(set, vertexIndex);
}
gpuIndices.Add(vertexIndex);
}
var gpuPrimitive = new GpuPrimitive(primitive.Topology, gpuIndices, gpuBufferView);
resultPrimitives[primitiveAndIndex.Index] = gpuPrimitive;
}
}
foreach (var indexMeshPrimitive in resultPrimitives)
{
result.Primitives.Add(indexMeshPrimitive);
}
return(result);
}