private protected unsafe override void UpdateBufferCore(DeviceBuffer buffer, uint bufferOffsetInBytes, IntPtr source, uint sizeInBytes)
{
D3D11Buffer d3dBuffer = Util.AssertSubtype <DeviceBuffer, D3D11Buffer>(buffer);
if (sizeInBytes == 0)
{
return;
}
bool isDynamic = (buffer.Usage & BufferUsage.Dynamic) == BufferUsage.Dynamic;
bool isStaging = (buffer.Usage & BufferUsage.Staging) == BufferUsage.Staging;
bool isUniformBuffer = (buffer.Usage & BufferUsage.UniformBuffer) == BufferUsage.UniformBuffer;
bool updateFullBuffer = bufferOffsetInBytes == 0 && sizeInBytes == buffer.SizeInBytes;
bool useUpdateSubresource = (!isDynamic && !isStaging) && (!isUniformBuffer || updateFullBuffer);
bool useMap = (isDynamic && updateFullBuffer) || isStaging;
if (useUpdateSubresource)
{
Box?subregion = new Box()
{
Left = (int)bufferOffsetInBytes,
Right = (int)(sizeInBytes + bufferOffsetInBytes),
Bottom = 1,
Back = 1
};
if (isUniformBuffer)
{
subregion = null;
}
lock (_immediateContextLock)
{
_immediateContext.UpdateSubresource(d3dBuffer.Buffer, 0, subregion, source, 0, 0);
}
}
else if (useMap)
{
MappedResource mr = MapCore(buffer, MapMode.Write, 0);
if (sizeInBytes < 1024)
{
Unsafe.CopyBlock((byte *)mr.Data + bufferOffsetInBytes, source.ToPointer(), sizeInBytes);
}
else
{
Buffer.MemoryCopy(
source.ToPointer(),
(byte *)mr.Data + bufferOffsetInBytes,
buffer.SizeInBytes,
sizeInBytes);
}
UnmapCore(buffer, 0);
}
else
{
D3D11Buffer staging = GetFreeStagingBuffer(sizeInBytes);
UpdateBuffer(staging, 0, source, sizeInBytes);
Box sourceRegion = new Box(0, 0, 0, (int)sizeInBytes, 1, 1);
lock (_immediateContextLock)
{
_immediateContext.CopySubresourceRegion(
d3dBuffer.Buffer, 0, (int)bufferOffsetInBytes, 0, 0,
staging.Buffer, 0,
sourceRegion);
}
lock (_stagingResourcesLock)
{
_availableStagingBuffers.Add(staging);
}
}
}