[PULL 03/19] ui/gtk: Make sure the right EGL context is currently bound

[marcandre . lureau]

From: Dongwon Kim <dongwon....@intel.com>

Observed a wrong context is bound when changing the scanout mode.
To prevent problem, it is needed to make sure to bind the right
context in gtk_egl_set_scanout_mode/gtk_gl_area_set_scanout_mode
as well as unbind one in the end of gd_egl_update/gd_gl_area_update.

Cc: Gerd Hoffmann <kra...@redhat.com>
Cc: Marc-André Lureau <marcandre.lur...@redhat.com>
Cc: Vivek Kasireddy <vivek.kasire...@intel.com>
Signed-off-by: Dongwon Kim <dongwon....@intel.com>
Reviewed-by: Marc-André Lureau <marcandre.lur...@redhat.com>
Message-ID: <20230628191504.17185-1-dongwon....@intel.com>
---
 ui/gtk-egl.c     | 4 ++++
 ui/gtk-gl-area.c | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/ui/gtk-egl.c b/ui/gtk-egl.c
index d59b8cd7d7..42db1bb6cf 100644
--- a/ui/gtk-egl.c
+++ b/ui/gtk-egl.c
@@ -32,6 +32,8 @@ static void gtk_egl_set_scanout_mode(VirtualConsole *vc, bool 
scanout)
 
     vc->gfx.scanout_mode = scanout;
     if (!vc->gfx.scanout_mode) {
+        eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
+                       vc->gfx.esurface, vc->gfx.ectx);
         egl_fb_destroy(&vc->gfx.guest_fb);
         if (vc->gfx.surface) {
             surface_gl_destroy_texture(vc->gfx.gls, vc->gfx.ds);
@@ -135,6 +137,8 @@ void gd_egl_update(DisplayChangeListener *dcl,
                    vc->gfx.esurface, vc->gfx.ectx);
     surface_gl_update_texture(vc->gfx.gls, vc->gfx.ds, x, y, w, h);
     vc->gfx.glupdates++;
+    eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE,
+                   EGL_NO_SURFACE, EGL_NO_CONTEXT);
 }
 
 void gd_egl_refresh(DisplayChangeListener *dcl)
diff --git a/ui/gtk-gl-area.c b/ui/gtk-gl-area.c
index 7367dfd793..a9a7fdf50c 100644
--- a/ui/gtk-gl-area.c
+++ b/ui/gtk-gl-area.c
@@ -26,6 +26,7 @@ static void gtk_gl_area_set_scanout_mode(VirtualConsole *vc, 
bool scanout)
 
     vc->gfx.scanout_mode = scanout;
     if (!vc->gfx.scanout_mode) {
+        gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
         egl_fb_destroy(&vc->gfx.guest_fb);
         if (vc->gfx.surface) {
             surface_gl_destroy_texture(vc->gfx.gls, vc->gfx.ds);
@@ -115,6 +116,7 @@ void gd_gl_area_update(DisplayChangeListener *dcl,
     gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
     surface_gl_update_texture(vc->gfx.gls, vc->gfx.ds, x, y, w, h);
     vc->gfx.glupdates++;
+    gdk_gl_context_clear_current();
 }
 
 void gd_gl_area_refresh(DisplayChangeListener *dcl)
-- 
2.41.0