/// <summary>
/// Maps a subresource.
/// </summary>
/// <param name="resource">The resource.</param>
/// <param name="subResourceIndex">Index of the sub resource.</param>
/// <param name="mapMode">The map mode.</param>
/// <param name="doNotWait">if set to <c>true</c> this method will return immediately if the resource is still being used by the GPU for writing. Default is false</param>
/// <param name="offsetInBytes">The offset information in bytes.</param>
/// <param name="lengthInBytes">The length information in bytes.</param>
/// <returns>Pointer to the sub resource to map.</returns>
public unsafe MappedResource MapSubresource(GraphicsResource resource, int subResourceIndex, MapMode mapMode, bool doNotWait = false, int offsetInBytes = 0, int lengthInBytes = 0)
{
if (resource == null)
{
throw new ArgumentNullException("resource");
}
SharpDX.DataBox dataBox = NativeDeviceContext.MapSubresource(resource.NativeResource, subResourceIndex, (SharpDX.Direct3D11.MapMode)mapMode, doNotWait ? SharpDX.Direct3D11.MapFlags.DoNotWait : SharpDX.Direct3D11.MapFlags.None);
var databox = *(DataBox *)Interop.Cast(ref dataBox);
if (!dataBox.IsEmpty)
{
databox.DataPointer = (IntPtr)((byte *)databox.DataPointer + offsetInBytes);
}
return(new MappedResource(resource, subResourceIndex, databox));
}