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offscreen-effect: Update handling of transforms

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In line with the changes made in f5f066df9c to clean up how Clutter
deals with transformations of actors this patch updates the code in
clutter-offscreen-effect.c. We now query the projection matrix from the
stage instead of the perspective and instead of duplicating the logic to
setup the stage view transform we now use
_clutter_actor_apply_modelview_transform for the stage instead.
This commit is contained in:
Robert Bragg 2010-09-16 12:58:42 +01:00
parent f0ab8edac0
commit d1b4495f7f
1 changed files with 23 additions and 41 deletions
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64
clutter/clutter-offscreen-effect.c
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@ -154,8 +154,8 @@ update_fbo (ClutterEffect *effect)
* to make this work reliably
*/
clutter_actor_get_transformed_size (priv->actor, &width, &height);
if (fabsf (priv->target_width - width) < 0.00001f &&
fabsf (priv->target_height - height) < 0.0001f)
if (priv->target_width == width &&
priv->target_height == height)
return TRUE;
if (priv->target != COGL_INVALID_HANDLE)
@ -250,7 +250,7 @@ clutter_offscreen_effect_pre_paint (ClutterEffect *effect)
{
ClutterOffscreenEffect *self = CLUTTER_OFFSCREEN_EFFECT (effect);
ClutterOffscreenEffectPrivate *priv = self->priv;
ClutterPerspective perspective;
CoglMatrix projection;
CoglColor transparent;
CoglMatrix modelview;
gfloat width, height;
@ -265,15 +265,10 @@ clutter_offscreen_effect_pre_paint (ClutterEffect *effect)
return FALSE;
/* get the current modelview matrix so that we can copy it
* on the new framebuffer
* to the framebuffer
*/
cogl_get_modelview_matrix (&modelview);
clutter_stage_get_perspective (CLUTTER_STAGE (priv->stage), &perspective);
clutter_actor_get_size (priv->stage, &width, &height);
get_screen_offsets (priv->actor, &priv->x_offset, &priv->y_offset);
/* let's draw offscreen */
cogl_push_framebuffer (priv->offscreen);
@ -281,11 +276,17 @@ clutter_offscreen_effect_pre_paint (ClutterEffect *effect)
* and it has its origin at the same position of the stage's; also
* set up the perspective to be the same as the stage's
*/
clutter_actor_get_size (priv->stage, &width, &height);
get_screen_offsets (priv->actor, &priv->x_offset, &priv->y_offset);
cogl_set_viewport (-priv->x_offset, -priv->y_offset, width, height);
cogl_perspective (perspective.fovy,
perspective.aspect,
perspective.z_near,
perspective.z_far);
/* Copy the stage's projection matrix across to the framebuffer */
_clutter_stage_get_projection_matrix (CLUTTER_STAGE (priv->stage),
&projection);
cogl_set_projection_matrix (&projection);
/* Copy the modelview that would have been used if rendering onscreen */
cogl_set_modelview_matrix (&modelview);
cogl_color_init_from_4ub (&transparent, 0, 0, 0, 0);
cogl_clear (&transparent,
@ -294,8 +295,6 @@ clutter_offscreen_effect_pre_paint (ClutterEffect *effect)
cogl_push_matrix ();
cogl_set_modelview_matrix (&modelview);
return TRUE;
}
@ -331,10 +330,7 @@ clutter_offscreen_effect_post_paint (ClutterEffect *effect)
{
ClutterOffscreenEffect *self = CLUTTER_OFFSCREEN_EFFECT (effect);
ClutterOffscreenEffectPrivate *priv = self->priv;
ClutterPerspective perspective;
CoglMatrix modelview, matrix;
gfloat width, height;
gfloat z_camera;
CoglMatrix modelview;
if (priv->offscreen == COGL_INVALID_HANDLE ||
priv->target == COGL_INVALID_HANDLE ||
@ -344,27 +340,16 @@ clutter_offscreen_effect_post_paint (ClutterEffect *effect)
cogl_pop_matrix ();
cogl_pop_framebuffer ();
clutter_stage_get_perspective (CLUTTER_STAGE (priv->stage), &perspective);
clutter_actor_get_size (priv->stage, &width, &height);
cogl_get_modelview_matrix (&modelview);
cogl_get_projection_matrix (&matrix);
z_camera = 0.5f * matrix.xx;
/* obliterate the current modelview matrix and reset it to be
* the same as the stage's at the beginning of a paint run; this
* is done to paint the target material in screen coordinates at
* the same place as the actor would have been
*/
cogl_matrix_init_identity (&matrix);
cogl_matrix_translate (&matrix, -0.5f, -0.5f, -z_camera);
cogl_matrix_scale (&matrix, 1.0f / width, -1.0f / height, 1.0f / width);
cogl_matrix_translate (&matrix, 0.0f, -1.0f * height, 0.0f);
cogl_set_modelview_matrix (&matrix);
cogl_push_matrix ();
cogl_translate (priv->x_offset, priv->y_offset, 0.0f);
/* Now reset the modelview to put us in stage coordinates so
* we can drawn the result of our offscreen render as a textured
* quad... */
cogl_matrix_init_identity (&modelview);
_clutter_actor_apply_modelview_transform (priv->stage, &modelview);
cogl_matrix_translate (&modelview, priv->x_offset, priv->y_offset, 0.0f);
cogl_set_modelview_matrix (&modelview);
/* paint the target material; this is virtualized for
* sub-classes that require special hand-holding
@ -372,9 +357,6 @@ clutter_offscreen_effect_post_paint (ClutterEffect *effect)
clutter_offscreen_effect_paint_target (self);
cogl_pop_matrix ();
/* reset the modelview matrix */
cogl_set_modelview_matrix (&modelview);
}
static void