vo_opengl: add dxinterop backend

WGL_NV_DX_interop is widely supported by Nvidia and AMD drivers. It
allows a texture to be shared between Direct3D and WGL, so that
rendering can be done with WGL and presentation can be done with
Direct3D. This should allow us to work around some persistent WGL
issues, such as dropped frames with some driver/OS combos, drivers that
buffer frames to increase performance at the cost of latency, and the
inability to disable exclusive fullscreen mode when using WGL to render
to a fullscreen window.

The addition of a DX_interop backend might also enable some cool
Direct3D-specific enhancements in the future, such as using the
GetPresentStatistics API to get accurate frame presentation timestamps.

Note that due to a driver bug, this backend is currently broken on
Intel. It will appear to work as long as the window is not resized too
often, but after a few changes of size it will be unable to share the
newly created renderbuffer with GL. See:
https://software.intel.com/en-us/forums/graphics-driver-bug-reporting/topic/562051

1 files changed, 3 insertions, 0 deletions

diff --git a/DOCS/man/vo.rst b/DOCS/man/vo.rst
index f4f78c491f..697584ca98 100644
--- a/DOCS/man/vo.rst
+++ b/DOCS/man/vo.rst
@@ -795,6 +795,9 @@ Available video output drivers are:
             Direct3D11 through the OpenGL ES translation layer ANGLE. This
             supports almost everything the ``win`` backend does, except ICC
             profiles, high bit depth video input, and the ``nnedi3`` prescaler.
+        dxinterop (experimental)
+            Win32, using WGL for rendering and Direct3D 9Ex for presentation.
+            Works on Nvidia and AMD only.
         x11
             X11/GLX
         wayland