GdkGLArea: fix has_alpha changes at runtime

We need to completely reallocate the buffers if we switch
has_alpha, because we may switch from render buffers to
texture.

diff --git a/gtk/gtkglarea.c b/gtk/gtkglarea.c
index 0c8788a1d505d1756c406e4909a5106cbd4451f6..c7583d64f4a18ab86825c035bdb763836bcc7ce0 100644 (file)
--- a/gtk/gtkglarea.c
+++ b/gtk/gtkglarea.c
@@ -367,6 +367,8 @@ gtk_gl_area_allocate_buffers (GtkGLArea *area, int width, int height)
       else
        glRenderbufferStorageEXT (GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24, width, height);
     }
+
+  priv->needs_render = TRUE;
 }
 
 static void
@@ -562,7 +564,6 @@ gtk_gl_area_size_allocate (GtkWidget     *widget,
       priv->needs_resize = TRUE;
     }
 
-  priv->needs_render = TRUE;
   gtk_gl_area_maybe_allocate_buffers (area);
 }
 
@@ -957,7 +958,7 @@ gtk_gl_area_set_has_alpha (GtkGLArea *area,
 
       g_object_notify (G_OBJECT (area), "has-alpha");
 
-      gtk_gl_area_maybe_allocate_buffers (area);
+      gtk_gl_area_delete_buffers (area);
     }
 }