[mutter/gbsneto/more-clutter-api: 25/25] clutter/paint-nodes: Push/pop framebuffer

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 317414ab26e0043d2d60d8cb924224168f3a2997
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Jan 29 12:55:11 2019 -0200

    clutter/paint-nodes: Push/pop framebuffer
    
    Unfortunately, many parts of GNOME Shell and Mutter and Clutter
    still use the implicit Cogl1 API. As such, it as a transition
    between the old and new APIs, it is important to keep the
    implicit draw framebuffer updated.
    
    ClutterRootNode does not keep it updated though, and it might
    lead to problems when rendering offscreen textures.
    
    Fix that by pushing and popping the root node framebuffer on
    pre- and post-draw, respectively.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/405

 clutter/clutter/clutter-paint-nodes.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/clutter/clutter/clutter-paint-nodes.c b/clutter/clutter/clutter-paint-nodes.c
index 74e544b51..d5efd5864 100644
--- a/clutter/clutter/clutter-paint-nodes.c
+++ b/clutter/clutter/clutter-paint-nodes.c
@@ -108,6 +108,8 @@ clutter_root_node_pre_draw (ClutterPaintNode *node)
 {
   ClutterRootNode *rnode = (ClutterRootNode *) node;
 
+  cogl_push_framebuffer (rnode->framebuffer);
+
   cogl_framebuffer_clear (rnode->framebuffer,
                           rnode->clear_flags,
                           &rnode->clear_color);
@@ -118,6 +120,7 @@ clutter_root_node_pre_draw (ClutterPaintNode *node)
 static void
 clutter_root_node_post_draw (ClutterPaintNode *node)
 {
+  cogl_pop_framebuffer ();
 }
 
 static void