vo_wayland: share frame callbacks.

Define frame callback logic in wayland_common.c
As this should be used by opengl renderer as well.

Preferably drawing should be skipped entierly when no frame callbacks
are received. However, for now only swap buffers is skipped.

1 files changed, 30 insertions, 0 deletions

diff --git a/video/out/wayland_common.c b/video/out/wayland_common.c
index 224a60d1e0..5ddd1ad54c 100644
--- a/video/out/wayland_common.c
+++ b/video/out/wayland_common.c
@@ -59,6 +59,8 @@ static void schedule_resize(struct vo_wayland_state *wl,
 
 static void vo_wayland_fullscreen (struct vo *vo);
 
+static const struct wl_callback_listener frame_listener;
+
 static const struct mp_keymap keymap[] = {
     // special keys
     {XKB_KEY_Pause,     MP_KEY_PAUSE}, {XKB_KEY_Escape, MP_KEY_ESC},
@@ -795,6 +797,30 @@ static void schedule_resize(struct vo_wayland_state *wl,
     wl->vo->dheight = height;
 }
 
+static void frame_callback(void *data,
+                           struct wl_callback *callback,
+                           uint32_t time)
+{
+    struct vo_wayland_state *wl = data;
+
+    if (callback)
+        wl_callback_destroy(callback);
+
+    wl->frame.callback = wl_surface_frame(wl->window.video_surface);
+
+    if (!wl->frame.callback) {
+        MP_ERR(wl, "wl_surface_frame failed\n");
+        return;
+    }
+
+    wl_callback_add_listener(wl->frame.callback, &frame_listener, wl);
+    wl->frame.pending = true;
+}
+
+static const struct wl_callback_listener frame_listener = {
+    frame_callback
+};
+
 static bool create_display (struct vo_wayland_state *wl)
 {
     if (wl->vo->probing && !getenv("XDG_RUNTIME_DIR"))
@@ -878,6 +904,7 @@ static bool create_window (struct vo_wayland_state *wl)
         wl_shell_surface_set_class(wl->window.shell_surface, "mpv");
     }
 
+    frame_callback(wl, NULL, 0);
     return true;
 }
 
@@ -888,6 +915,9 @@ static void destroy_window (struct vo_wayland_state *wl)
 
     if (wl->window.video_surface)
         wl_surface_destroy(wl->window.video_surface);
+
+    if (wl->frame.callback)
+        wl_callback_destroy(wl->frame.callback);
 }
 
 static bool create_cursor (struct vo_wayland_state *wl)