[gtk/wip/chergert/gdk-macos-gl-renderer: 7/26] macos: use shared data GL context

[Christian Hergert <chergert src gnome org>]

commit 4dfbb34a02549c4e2f4fa2380299b685c94eaf46
Author: Christian Hergert <chergert redhat com>
Date:   Thu Oct 22 14:04:52 2020 -0700

    macos: use shared data GL context
    
    This fixes drawing of supplemental windows which were previously just empty or
    black. It also fixes drawing into opaque windows with titled style masks.

 gdk/macos/gdkmacosglcontext.c | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/gdk/macos/gdkmacosglcontext.c b/gdk/macos/gdkmacosglcontext.c
index 38a42634f4..e41b4d2ee9 100644
--- a/gdk/macos/gdkmacosglcontext.c
+++ b/gdk/macos/gdkmacosglcontext.c
@@ -89,6 +89,14 @@ gdk_macos_gl_context_real_realize (GdkGLContext  *context,
             return FALSE;
         }
 
+      if (shared == NULL)
+        {
+          GdkGLContext *shared_data = gdk_surface_get_shared_data_gl_context (surface);
+
+          if (shared_data != NULL)
+            shared_gl_context = get_ns_open_gl_context (GDK_MACOS_GL_CONTEXT (shared_data), NULL);
+        }
+
       nswindow = _gdk_macos_surface_get_native (GDK_MACOS_SURFACE (surface));
       pixelFormat = [GdkMacosGLView defaultPixelFormat];
       gl_context = [[NSOpenGLContext alloc] initWithFormat:pixelFormat