From a213ee960a95815b5bc409f132c704c54948c91a Mon Sep 17 00:00:00 2001
From: Quantum <quantum2048@gmail.com>
Date: Sat, 31 Jul 2021 04:01:51 -0400
Subject: [PATCH] [client] wayland: implement signalNextFrame with frame
 callbacks

---
 client/displayservers/Wayland/wayland.c |  1 +
 client/displayservers/Wayland/wayland.h |  1 +
 client/displayservers/Wayland/window.c  | 19 +++++++++++++++++++
 3 files changed, 21 insertions(+)

diff --git a/client/displayservers/Wayland/wayland.c b/client/displayservers/Wayland/wayland.c
index 78cf8714..0ee9a292 100644
--- a/client/displayservers/Wayland/wayland.c
+++ b/client/displayservers/Wayland/wayland.c
@@ -164,6 +164,7 @@ struct LG_DisplayServerOps LGDS_Wayland =
   .glSetSwapInterval   = waylandGLSetSwapInterval,
   .glSwapBuffers       = waylandGLSwapBuffers,
 #endif
+  .signalNextFrame     = waylandSignalNextFrame,
   .guestPointerUpdated = waylandGuestPointerUpdated,
   .setPointer          = waylandSetPointer,
   .grabPointer         = waylandGrabPointer,
diff --git a/client/displayservers/Wayland/wayland.h b/client/displayservers/Wayland/wayland.h
index 2f208b35..14f6bfa6 100644
--- a/client/displayservers/Wayland/wayland.h
+++ b/client/displayservers/Wayland/wayland.h
@@ -289,3 +289,4 @@ void waylandWindowFree(void);
 void waylandWindowUpdateScale(void);
 void waylandSetWindowSize(int x, int y);
 bool waylandIsValidPointerPos(int x, int y);
+void waylandSignalNextFrame(LGEvent * event);
diff --git a/client/displayservers/Wayland/window.c b/client/displayservers/Wayland/window.c
index edea79e6..5504108d 100644
--- a/client/displayservers/Wayland/window.c
+++ b/client/displayservers/Wayland/window.c
@@ -27,6 +27,7 @@
 
 #include "app.h"
 #include "common/debug.h"
+#include "common/event.h"
 
 // Surface-handling listeners.
 
@@ -114,3 +115,21 @@ bool waylandIsValidPointerPos(int x, int y)
 {
   return x >= 0 && x < wlWm.width && y >= 0 && y < wlWm.height;
 }
+
+static void frameHandler(void * opaque, struct wl_callback * callback, unsigned int data)
+{
+  LGEvent * event = opaque;
+  lgSignalEvent(event);
+  wl_callback_destroy(callback);
+}
+
+static const struct wl_callback_listener frame_listener = {
+   .done = frameHandler,
+};
+
+void waylandSignalNextFrame(LGEvent * event)
+{
+  struct wl_callback * callback = wl_surface_frame(wlWm.surface);
+  if (callback)
+    wl_callback_add_listener(callback, &frame_listener, event);
+}