vo: add new vaapi-wayland driver

This driver makes use of dmabuffer and viewporter interfaces
to enable efficient display of vaapi surfaces, avoiding
any unnecessary colour space conversion, and avoiding scaling
or colour conversion using GPU shader resources.

DOCS/man/options.rst

@@ -1249,7 +1249,7 @@ Video
     :videotoolbox: requires ``--vo=gpu`` (macOS 10.8 and up),
                    or ``--vo=libmpv`` (iOS 9.0 and up)
     :videotoolbox-copy: copies video back into system RAM (macOS 10.8 or iOS 9.0 and up)
-    :vaapi:     requires ``--vo=gpu`` or ``--vo=vaapi`` (Linux only)
+    :vaapi:     requires ``--vo=gpu``, ``--vo=vaapi`` or ``--vo=vaapi-wayland`` (Linux only)
     :vaapi-copy: copies video back into system RAM (Linux with some GPUs only)
     :nvdec:     requires ``--vo=gpu`` (Any platform CUDA is available)
     :nvdec-copy: copies video back to system RAM (Any platform CUDA is available)

DOCS/man/vo.rst

@@ -286,6 +286,14 @@ Available video output drivers are:
     ``--sdl-switch-mode``
         Instruct SDL to switch the monitor video mode when going fullscreen.
 
+``vaapi-wayland``
+    Experimental Wayland output driver designed for use with VA API hardware decoding.
+    The driver is designed to avoid any GPU to CPU copies, and to perform scaling and
+    color space conversion using fixed-function hardware, if available,
+    rather than GPU shaders. This frees up GPU resources for other tasks.
+    Currently this driver is experimental and only works with the ``--hwdec=vaapi`` driver;
+    OSD is also not supported. Supported compositors : Weston and Sway.
+
 ``vaapi``
     Intel VA API video output driver with support for hardware decoding. Note
     that there is absolutely no reason to use this, other than compatibility.

generated/wayland/meson.build

@@ -1,7 +1,9 @@
 wl_protocol_dir = wayland['deps'][2].get_variable(pkgconfig: 'pkgdatadir')
-protocols = [[wl_protocol_dir, 'stable/xdg-shell/xdg-shell.xml'],
-             [wl_protocol_dir, 'stable/presentation-time/presentation-time.xml'],
+protocols = [[wl_protocol_dir, 'stable/presentation-time/presentation-time.xml'],
+             [wl_protocol_dir, 'stable/viewporter/viewporter.xml'],
+             [wl_protocol_dir, 'stable/xdg-shell/xdg-shell.xml'],
              [wl_protocol_dir, 'unstable/idle-inhibit/idle-inhibit-unstable-v1.xml'],
+             [wl_protocol_dir, 'unstable/linux-dmabuf/linux-dmabuf-unstable-v1.xml'],
              [wl_protocol_dir, 'unstable/xdg-decoration/xdg-decoration-unstable-v1.xml']]
 wl_protocols_source = []
 wl_protocols_headers = []

meson.build

@@ -1432,10 +1432,16 @@ vaapi_wayland = {
     'deps': dependency('libva-wayland', version: '>= 1.1.0', required: get_option('vaapi-wayland')),
 }
 vaapi_wayland += {'use': vaapi['use'] and egl_wayland['use'] and vaapi_wayland['deps'].found()}
+
 if vaapi_wayland['use']
     features += vaapi_wayland['name']
 endif
 
+if vaapi_wayland['use'] and memfd_create
+    features += 'vaapi-wayland-memfd'
+    sources += files('video/out/vo_vaapi_wayland.c')
+endif
+
 vaapi_x11 = {
     'name': 'vaapi-x11',
     'deps': dependency('libva-x11', version: '>= 1.1.0', required: get_option('vaapi-x11')),