media: support OpenGL-based video playback on macOS

If we have GStreamer on macOS we likely have support for CGL to get an
OpenGL context we can use. This provides the missing pieces to get
accelerated video playback in gtk4-widget-factory working.

diff --git a/modules/media/gtkgstsink.c b/modules/media/gtkgstsink.c
index c2708da148f666b693ab90d3b0748d87a761e942..529952fffc32691f781c2fa63b88524c36e877d8 100644 (file)
--- a/modules/media/gtkgstsink.c
+++ b/modules/media/gtkgstsink.c
@@ -48,6 +48,10 @@
 #include <gst/gl/egl/gstgldisplay_egl.h>
 #endif
 
+#ifdef GDK_WINDOWING_MACOS
+#include <gdk/macos/gdkmacos.h>
+#endif
+
 #include <gst/gl/gstglfuncs.h>
 
 enum {
@@ -497,6 +501,29 @@ gtk_gst_sink_initialize_gl (GtkGstSink *self)
     }
   else
 #endif
+#if defined(GST_GL_HAVE_PLATFORM_CGL) && defined(GDK_WINDOWING_MACOS)
+  if (GDK_IS_MACOS_DISPLAY (display))
+    {
+      platform = GST_GL_PLATFORM_CGL;
+
+      GST_DEBUG_OBJECT (self, "got CGL on macOS!");
+
+      gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
+      gl_handle = gst_gl_context_get_current_gl_context (platform);
+
+      if (gl_handle)
+        {
+          self->gst_display = gst_gl_display_new ();
+          self->gst_app_context = gst_gl_context_new_wrapped (self->gst_display, gl_handle, platform, gl_api);
+        }
+      else
+        {
+          GST_ERROR_OBJECT (self, "Failed to get handle from GdkGLContext, not using macOS CGL");
+          return FALSE;
+        }
+    }
+  else
+#endif
 #if GST_GL_HAVE_WINDOW_WIN32 && (GST_GL_HAVE_PLATFORM_WGL || GST_GL_HAVE_PLATFORM_EGL) && defined (GDK_WINDOWING_WIN32)
   if (GDK_IS_WIN32_DISPLAY (display))
     {