/// <summary>
/// Copies the content an array of data on CPU memory to this buffer into GPU memory.
/// </summary>
/// <param name="device">The <see cref="GraphicsDevice"/>.</param>
/// <param name="fromData">A data pointer.</param>
/// <param name="offsetInBytes">The offset in bytes to write to.</param>
/// <exception cref="System.ArgumentException"></exception>
/// <remarks>
/// See the unmanaged documentation about Map/UnMap for usage and restrictions.
/// </remarks>
public void SetData(CommandList commandList, DataPointer fromData, int offsetInBytes = 0)
{
// Check size validity of data to copy to
if (fromData.Size > this.Description.SizeInBytes)
{
throw new ArgumentException("Size of data to upload larger than size of buffer");
}
// If this texture is declared as default usage, we can only use UpdateSubresource, which is not optimal but better than nothing
if (this.Description.Usage == GraphicsResourceUsage.Default)
{
// Setup the dest region inside the buffer
if ((this.Description.BufferFlags & BufferFlags.ConstantBuffer) != 0)
{
commandList.UpdateSubresource(this, 0, new DataBox(fromData.Pointer, 0, 0));
}
else
{
var destRegion = new ResourceRegion(offsetInBytes, 0, 0, offsetInBytes + fromData.Size, 1, 1);
commandList.UpdateSubresource(this, 0, new DataBox(fromData.Pointer, 0, 0), destRegion);
}
}
else
{
if (offsetInBytes > 0)
{
throw new ArgumentException("offset is only supported for textured declared with ResourceUsage.Default", "offsetInBytes");
}
var mappedResource = commandList.MapSubresource(this, 0, Usage == GraphicsResourceUsage.Staging ? MapMode.Write : MapMode.WriteDiscard);
Utilities.CopyMemory(mappedResource.DataBox.DataPointer, fromData.Pointer, fromData.Size);
commandList.UnmapSubresource(mappedResource);
}
}
public void Apply(CommandList commandList, ResourceGroup[] resourceGroups, int resourceGroupsOffset)
{
if (resourceGroupBindings.Length == 0)
{
return;
}
var resourceGroupBinding = Interop.Pin(ref resourceGroupBindings[0]);
for (int i = 0; i < resourceGroupBindings.Length; i++, resourceGroupBinding = Interop.IncrementPinned(resourceGroupBinding))
{
var resourceGroup = resourceGroups[resourceGroupsOffset + i];
// Upload cbuffer (if not done yet)
if (resourceGroupBinding.ConstantBufferSlot != -1 && resourceGroup != null && resourceGroup.ConstantBuffer.Data != IntPtr.Zero)
{
var preallocatedBuffer = resourceGroup.ConstantBuffer.Buffer;
bool needUpdate = true;
if (preallocatedBuffer == null)
{
preallocatedBuffer = resourceGroupBinding.ConstantBufferPreallocated; // If it's preallocated buffer, we always upload
}
else if (resourceGroup.ConstantBuffer.Uploaded)
{
needUpdate = false; // If it's not preallocated and already uploaded, we can avoid uploading it again
}
else
{
resourceGroup.ConstantBuffer.Uploaded = true; // First time it is uploaded
}
if (needUpdate)
{
if (hasResourceRenaming)
{
var mappedConstantBuffer = commandList.MapSubresource(preallocatedBuffer, 0, MapMode.WriteDiscard);
Utilities.CopyMemory(mappedConstantBuffer.DataBox.DataPointer, resourceGroup.ConstantBuffer.Data, resourceGroup.ConstantBuffer.Size);
commandList.UnmapSubresource(mappedConstantBuffer);
}
else
{
commandList.UpdateSubresource(preallocatedBuffer, 0, new DataBox(resourceGroup.ConstantBuffer.Data, resourceGroup.ConstantBuffer.Size, 0));
}
}
resourceGroup.DescriptorSet.SetConstantBuffer(resourceGroupBinding.ConstantBufferSlot, preallocatedBuffer, resourceGroup.ConstantBuffer.Offset, resourceGroup.ConstantBuffer.Size);
}
}
}