Analogous to the Vulkan adapter. This is slightly awkward in OpenGL
because it doesn't have explicit command buffers like Vulkan, but
calling wined3d_context_gl_submit_command_fence() on swapchain present
works well enough in practice. The main advantage of this approach is that it
avoids using a separate fence for each usage of each bo.
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Matteo Bruni <mbruni@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>