public override void Present()
{
GraphicsDevice.Begin();
// If we made a fake render target to avoid OpenGL limitations on window-provided back buffer, let's copy the rendering result to it
if (GraphicsDevice.DefaultRenderTarget != GraphicsDevice.windowProvidedRenderTexture)
{
GraphicsDevice.Copy(GraphicsDevice.DefaultRenderTarget, GraphicsDevice.windowProvidedRenderTexture);
}
OpenTK.Graphics.GraphicsContext.CurrentContext.SwapBuffers();
GraphicsDevice.End();
}
/// <summary>
/// Copies the content of this buffer from GPU memory to a CPU memory using a specific staging resource.
/// </summary>
/// <param name="stagingTexture">The staging buffer used to transfer the buffer.</param>
/// <param name="toData">To data pointer.</param>
/// <exception cref="System.ArgumentException">When strides is different from optimal strides, and TData is not the same size as the pixel format, or Width * Height != toData.Length</exception>
/// <remarks>
/// This method is only working when called from the main thread that is accessing the main <see cref="GraphicsDevice"/>.
/// </remarks>
public void GetData(Buffer stagingTexture, DataPointer toData)
{
// Check size validity of data to copy to
if (toData.Size > this.Description.SizeInBytes)
{
throw new ArgumentException("Length of TData is larger than size of buffer");
}
// Copy the texture to a staging resource
if (!ReferenceEquals(this, stagingTexture))
{
GraphicsDevice.Copy(this, stagingTexture);
}
// Map the staging resource to a CPU accessible memory
var mappedResource = GraphicsDevice.MapSubresource(stagingTexture, 0, MapMode.Read);
Utilities.CopyMemory(toData.Pointer, mappedResource.DataBox.DataPointer, toData.Size);
// Make sure that we unmap the resource in case of an exception
GraphicsDevice.UnmapSubresource(mappedResource);
}