private GltfPrimitiveStorageLocation[] AllocateMeshes(MgStorageBlockAllocationRequest request, GltfMesh[] meshes, GltfAccessor[] accessors, GltfBufferView[] bufferViews)
{
var locations = new List <GltfPrimitiveStorageLocation>();
foreach (var mesh in meshes)
{
foreach (var primitive in mesh.Primitives)
{
var locator = primitive.VertexLocations;
var finalLocation = new GltfPrimitiveStorageLocation {
};
finalLocation.CopyOperations = GenerateCopyOps(primitive.VertexCount, request, accessors, bufferViews, locator, finalLocation);
locations.Add(finalLocation);
}
}
return(locations.ToArray());
}
private static GltfInterleavedOperation[] GenerateCopyOps(uint vertexCount, MgStorageBlockAllocationRequest request, GltfAccessor[] accessors, GltfBufferView[] bufferViews, IPerVertexDataLocator locator, GltfPrimitiveStorageLocation finalLocation)
{
var totalSize = 0UL;
var vertexFields = new int?[]
{
locator.Position,
locator.Normal,
locator.Tangent,
locator.TexCoords0,
locator.TexCoords1,
locator.Color0,
locator.Color1,
locator.Joints0,
locator.Joints1,
locator.Weights0,
locator.Weights1,
};
var paddingByteStride = new uint[]
{
12U,
12U,
16U,
8U,
8U,
16U,
16U,
4U,
4U,
16U,
16U,
};
var copyOps = new List <GltfInterleavedOperation>();
var vertexBufferStride = 0U;
for (var i = 0; i < vertexFields.Length; i += 1)
{
var field = vertexFields[i];
if (field.HasValue)
{
var selected = accessors[field.Value];
var op = CreateCopyOp(copyOps, selected, bufferViews);
vertexBufferStride += op.ByteStride;
totalSize += selected.TotalByteSize;
}
else
{
vertexBufferStride += paddingByteStride[i];
totalSize += vertexCount * paddingByteStride[i];
}
}
foreach (var op in copyOps)
{
op.DstStride = vertexBufferStride;
}
var vertexInfo = new MgStorageBlockAllocationInfo
{
MemoryPropertyFlags = MgMemoryPropertyFlagBits.HOST_COHERENT_BIT,
Usage = MgBufferUsageFlagBits.VERTEX_BUFFER_BIT,
ElementByteSize = vertexBufferStride,
Size = totalSize,
};
finalLocation.Vertex = request.Insert(vertexInfo);
if (locator.Indices.HasValue)
{
var selected = accessors[locator.Indices.Value];
var op = CreateCopyOp(copyOps, selected, bufferViews);
op.DstStride = selected.ElementByteSize;
var indexInfo = new MgStorageBlockAllocationInfo
{
MemoryPropertyFlags = MgMemoryPropertyFlagBits.HOST_COHERENT_BIT,
Usage = MgBufferUsageFlagBits.INDEX_BUFFER_BIT,
Size = selected.TotalByteSize,
ElementByteSize = selected.ElementByteSize,
};
finalLocation.Index = request.Insert(indexInfo);
}
return(copyOps.ToArray());
}
