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[stage-x11] Ensure viewport is initialized before first stage paint

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This ensures that glViewport is called before the first stage paint.
Previously _clutter_stage_maybe_setup_viewport (which is done before we
start painting) was bailing out without calling cogl_setup_viewport because
the CLUTTER_STAGE_IN_RESIZE flag may be set if the stage was resized before
the first paint.  (NB: The CLUTTER_STAGE_IN_RESIZE flag isn't removed until
we get an explicit event back from the X server since the window manager may
choose to deny/alter the resize.)

We now special case the first resize - where the viewport hasn't previously
been initialized and use the requested geometry to initialize the
glViewport without waiting for a reply from the server.
This commit is contained in:
Robert Bragg 2009-10-20 16:55:10 +01:00
parent ad98e96d97
commit f8f8873714
2 changed files with 22 additions and 3 deletions
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18
clutter/x11/clutter-stage-x11.c
View File

@ -210,6 +210,7 @@ clutter_stage_x11_resize (ClutterStageWindow *stage_window,
ClutterBackend *backend = clutter_get_default_backend ();
ClutterBackendX11 *backend_x11;
ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (stage_window);
ClutterStage *stage = stage_x11->wrapper;
gboolean resize;
resize = clutter_stage_get_user_resizable (stage_x11->wrapper);
@ -250,6 +251,22 @@ clutter_stage_x11_resize (ClutterStageWindow *stage_window,
stage_x11->xwin,
stage_x11->xwin_width,
stage_x11->xwin_height);
/* If the viewport hasn't previously been initialized then even
* though we can't guarantee that the server will honour our request
* we need to ensure a valid viewport is set before our first paint.
*/
if (G_UNLIKELY (!stage_x11->viewport_initialized))
{
ClutterPerspective perspective;
clutter_stage_get_perspective (stage, &perspective);
_cogl_setup_viewport (stage_x11->xwin_width,
stage_x11->xwin_height,
perspective.fovy,
perspective.aspect,
perspective.z_near,
perspective.z_far);
}
}
if (!resize)
@ -654,6 +671,7 @@ clutter_stage_x11_init (ClutterStageX11 *stage)
stage->is_foreign_xwin = FALSE;
stage->fullscreen_on_map = FALSE;
stage->is_cursor_visible = TRUE;
stage->viewport_initialized = FALSE;
stage->title = NULL;

1
clutter/x11/clutter-stage-x11.h
View File

@ -53,6 +53,7 @@ struct _ClutterStageX11
guint is_foreign_xwin : 1;
guint fullscreen_on_map : 1;
guint is_cursor_visible : 1;
guint viewport_initialized : 1;
Window xwin;
gint xwin_width;