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clutter-stage: Don't override the user's perspective matrix

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Since eef9078f ClutterStage updates the aspect ratio of the
perspective matrix whenever the size of the stage changes. This meant
that if an application tries to set its own perspective matrix then
part of it would get overridden. It's not really clear what the
use-case of setting the perspective on the stage should be but it
seems like the safest bet is to always try to preserve the
application's request. The documentation for the function has been
tweaked to discourage its use.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2625
This commit is contained in:
Neil Roberts 2011-04-04 18:42:52 +01:00 committed by Robert Bragg
parent d90c849e80
commit 2022e4c100
1 changed files with 43 additions and 19 deletions
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58
clutter/clutter-stage.c
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@ -176,6 +176,7 @@ struct _ClutterStagePrivate
guint have_valid_pick_buffer : 1;
guint accept_focus : 1;
guint motion_events_enabled : 1;
guint has_custom_perspective : 1;
};
enum
@ -2136,24 +2137,11 @@ clutter_stage_get_color (ClutterStage *stage,
*color = priv->color;
}
/**
* clutter_stage_set_perspective:
* @stage: A #ClutterStage
* @perspective: A #ClutterPerspective
*
* Sets the stage perspective.
*/
void
clutter_stage_set_perspective (ClutterStage *stage,
static void
clutter_stage_set_perspective_internal (ClutterStage *stage,
ClutterPerspective *perspective)
{
ClutterStagePrivate *priv;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
g_return_if_fail (perspective != NULL);
g_return_if_fail (perspective->z_far - perspective->z_near != 0);
priv = stage->priv;
ClutterStagePrivate *priv = stage->priv;
if (priv->perspective.fovy == perspective->fovy &&
priv->perspective.aspect == perspective->aspect &&
@ -2176,6 +2164,35 @@ clutter_stage_set_perspective (ClutterStage *stage,
clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
}
/**
* clutter_stage_set_perspective:
* @stage: A #ClutterStage
* @perspective: A #ClutterPerspective
*
* Sets the stage perspective. Using this function is not recommended
* because it will disable Clutter's attempts to generate an
* appropriate perspective based on the size of the stage.
*/
void
clutter_stage_set_perspective (ClutterStage *stage,
ClutterPerspective *perspective)
{
ClutterStagePrivate *priv;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
g_return_if_fail (perspective != NULL);
g_return_if_fail (perspective->z_far - perspective->z_near != 0);
priv = stage->priv;
/* If the application ever calls this function then we'll stop
automatically updating the perspective when the stage changes
size */
priv->has_custom_perspective = TRUE;
clutter_stage_set_perspective_internal (stage, perspective);
}
/**
* clutter_stage_get_perspective:
* @stage: A #ClutterStage
@ -3134,8 +3151,15 @@ _clutter_stage_maybe_setup_viewport (ClutterStage *stage)
priv->viewport[3]);
perspective = priv->perspective;
/* Ideally we want to regenerate the perspective matrix whenever
the size changes but if the user has provided a custom matrix
then we don't want to override it */
if (!priv->has_custom_perspective)
{
perspective.aspect = priv->viewport[2] / priv->viewport[3];
clutter_stage_set_perspective (stage, &perspective);
clutter_stage_set_perspective_internal (stage, &perspective);
}
cogl_matrix_init_identity (&priv->view);
cogl_matrix_view_2d_in_perspective (&priv->view,