39f4848b93
Bug 1392 - behaviour_set_alpha set same alpha twice lead to warning and destroy the input alpha The following functions are fixed: clutter_actor_set_shader clutter_alpha_set_timeline clutter_behaviour_set_alpha clutter_clone_texture_set_parent_texture They either now reference the new value before destroying the old value, or just return immediately if the values are the same.
1452 lines
36 KiB
C
1452 lines
36 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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* Jorn Baayen <jorn@openedhand.com>
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* Emmanuele Bassi <ebassi@openedhand.com>
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* Tomas Frydrych <tf@openedhand.com>
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*
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* Copyright (C) 2006, 2007 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:clutter-alpha
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* @short_description: A class for calculating an alpha value as a function
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* of time.
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*
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* #ClutterAlpha is a class for calculating an integer value between
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* 0 and %CLUTTER_ALPHA_MAX_ALPHA as a function of time.
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*
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* A #ClutterAlpha binds a #ClutterTimeline to a progress function which
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* translates the time T into an adimensional factor alpha. The factor can
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* then be used to drive a #ClutterBehaviour, which will translate the
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* alpha value into something meaningful for a #ClutterActor.
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*
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* You should provide a #ClutterTimeline and bind it to the #ClutterAlpha
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* instance using clutter_alpha_set_timeline(); you should also provide a
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* function returning the alpha value depending on the progress of the
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* timeline, using clutter_alpha_set_func() or clutter_alpha_set_closure().
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* The alpha function will be executed each time a new frame in the
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* #ClutterTimeline is reached.
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*
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* Since the alpha function is controlled by the timeline instance, you can
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* pause, stop or resume the #ClutterAlpha from calling the alpha function by
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* using the appropriate functions of the #ClutterTimeline object.
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*
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* #ClutterAlpha is used to "drive" a #ClutterBehaviour instance.
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*
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* <figure id="alpha-functions">
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* <title>Graphic representation of some alpha functions</title>
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* <graphic fileref="alpha-func.png" format="PNG"/>
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* </figure>
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*
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* Since: 0.2
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <math.h>
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#include "clutter-alpha.h"
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#include "clutter-debug.h"
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#include "clutter-enum-types.h"
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#include "clutter-main.h"
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#include "clutter-marshal.h"
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#include "clutter-private.h"
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G_DEFINE_TYPE (ClutterAlpha, clutter_alpha, G_TYPE_INITIALLY_UNOWNED);
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struct _ClutterAlphaPrivate
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{
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ClutterTimeline *timeline;
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guint timeline_new_frame_id;
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guint32 alpha;
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GClosure *closure;
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ClutterAnimationMode mode;
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};
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enum
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{
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PROP_0,
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PROP_TIMELINE,
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PROP_ALPHA,
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PROP_MODE
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};
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static void
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timeline_new_frame_cb (ClutterTimeline *timeline,
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guint current_frame_num,
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ClutterAlpha *alpha)
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{
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ClutterAlphaPrivate *priv = alpha->priv;
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/* Update alpha value and notify */
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priv->alpha = clutter_alpha_get_alpha (alpha);
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g_object_notify (G_OBJECT (alpha), "alpha");
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}
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static void
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clutter_alpha_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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ClutterAlpha *alpha;
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ClutterAlphaPrivate *priv;
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alpha = CLUTTER_ALPHA (object);
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priv = alpha->priv;
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switch (prop_id)
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{
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case PROP_TIMELINE:
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clutter_alpha_set_timeline (alpha, g_value_get_object (value));
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break;
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case PROP_MODE:
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clutter_alpha_set_mode (alpha, g_value_get_enum (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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clutter_alpha_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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ClutterAlpha *alpha;
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ClutterAlphaPrivate *priv;
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alpha = CLUTTER_ALPHA (object);
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priv = alpha->priv;
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switch (prop_id)
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{
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case PROP_TIMELINE:
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g_value_set_object (value, priv->timeline);
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break;
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case PROP_ALPHA:
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g_value_set_uint (value, priv->alpha);
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break;
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case PROP_MODE:
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g_value_set_enum (value, priv->mode);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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clutter_alpha_finalize (GObject *object)
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{
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ClutterAlphaPrivate *priv = CLUTTER_ALPHA (object)->priv;
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if (priv->closure)
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g_closure_unref (priv->closure);
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G_OBJECT_CLASS (clutter_alpha_parent_class)->finalize (object);
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}
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static void
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clutter_alpha_dispose (GObject *object)
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{
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ClutterAlpha *self = CLUTTER_ALPHA(object);
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clutter_alpha_set_timeline (self, NULL);
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G_OBJECT_CLASS (clutter_alpha_parent_class)->dispose (object);
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}
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static void
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clutter_alpha_class_init (ClutterAlphaClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->set_property = clutter_alpha_set_property;
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object_class->get_property = clutter_alpha_get_property;
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object_class->finalize = clutter_alpha_finalize;
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object_class->dispose = clutter_alpha_dispose;
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g_type_class_add_private (klass, sizeof (ClutterAlphaPrivate));
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/**
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* ClutterAlpha:timeline:
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*
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* A #ClutterTimeline instance used to drive the alpha function.
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*
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* Since: 0.2
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*/
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g_object_class_install_property (object_class,
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PROP_TIMELINE,
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g_param_spec_object ("timeline",
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"Timeline",
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"Timeline",
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CLUTTER_TYPE_TIMELINE,
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CLUTTER_PARAM_READWRITE));
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/**
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* ClutterAlpha:alpha:
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*
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* The alpha value as computed by the alpha function.
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*
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* Since: 0.2
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*/
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g_object_class_install_property (object_class,
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PROP_ALPHA,
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g_param_spec_uint ("alpha",
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"Alpha value",
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"Alpha value",
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0,
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CLUTTER_ALPHA_MAX_ALPHA,
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0,
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CLUTTER_PARAM_READABLE));
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/**
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* ClutterAlpha:mode:
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*
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* The progress function as a #ClutterAnimationMode enumeration
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* value. If %CLUTTER_CUSTOM_MODE is used then the function set
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* using clutter_alpha_set_closure() or clutter_alpha_set_func()
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* will be used.
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*
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* Since: 1.0
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*/
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g_object_class_install_property (object_class,
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PROP_MODE,
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g_param_spec_enum ("mode",
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"Mode",
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"Progress mode",
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CLUTTER_TYPE_ANIMATION_MODE,
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CLUTTER_CUSTOM_MODE,
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G_PARAM_CONSTRUCT |
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CLUTTER_PARAM_READWRITE));
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}
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static void
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clutter_alpha_init (ClutterAlpha *self)
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{
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self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
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CLUTTER_TYPE_ALPHA,
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ClutterAlphaPrivate);
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self->priv->mode = CLUTTER_CUSTOM_MODE;
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}
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/**
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* clutter_alpha_get_alpha:
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* @alpha: A #ClutterAlpha
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*
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* Query the current alpha value.
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*
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* Return Value: The current alpha value for the alpha
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*
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* Since: 0.2
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*/
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guint32
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clutter_alpha_get_alpha (ClutterAlpha *alpha)
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{
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ClutterAlphaPrivate *priv;
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guint32 retval = 0;
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g_return_val_if_fail (CLUTTER_IS_ALPHA (alpha), 0);
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priv = alpha->priv;
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if (G_LIKELY (priv->closure))
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{
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GValue params = { 0, };
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GValue result_value = { 0, };
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g_object_ref (alpha);
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g_value_init (&result_value, G_TYPE_UINT);
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g_value_init (¶ms, CLUTTER_TYPE_ALPHA);
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g_value_set_object (¶ms, alpha);
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g_closure_invoke (priv->closure,
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&result_value,
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1,
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¶ms,
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NULL);
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retval = g_value_get_uint (&result_value);
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g_value_unset (&result_value);
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g_value_unset (¶ms);
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g_object_unref (alpha);
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}
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return retval;
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}
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/**
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* clutter_alpha_set_closure:
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* @alpha: A #ClutterAlpha
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* @closure: A #GClosure
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*
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* Sets the #GClosure used to compute
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* the alpha value at each frame of the #ClutterTimeline
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* bound to @alpha.
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*
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* Since: 0.8
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*/
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void
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clutter_alpha_set_closure (ClutterAlpha *alpha,
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GClosure *closure)
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{
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ClutterAlphaPrivate *priv;
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g_return_if_fail (CLUTTER_IS_ALPHA (alpha));
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g_return_if_fail (closure != NULL);
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priv = alpha->priv;
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if (priv->closure)
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g_closure_unref (priv->closure);
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priv->closure = g_closure_ref (closure);
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g_closure_sink (closure);
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if (G_CLOSURE_NEEDS_MARSHAL (closure))
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{
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GClosureMarshal marshal = clutter_marshal_UINT__VOID;
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g_closure_set_marshal (closure, marshal);
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}
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priv->mode = CLUTTER_CUSTOM_MODE;
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g_object_notify (G_OBJECT (alpha), "mode");
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}
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/**
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* clutter_alpha_set_func:
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* @alpha: A #ClutterAlpha
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* @func: A #ClutterAlphaFunc
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* @data: user data to be passed to the alpha function, or %NULL
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* @destroy: notify function used when disposing the alpha function
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*
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* Sets the #ClutterAlphaFunc function used to compute
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* the alpha value at each frame of the #ClutterTimeline
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* bound to @alpha.
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*
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* Since: 0.2
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*/
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void
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clutter_alpha_set_func (ClutterAlpha *alpha,
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ClutterAlphaFunc func,
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gpointer data,
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GDestroyNotify destroy)
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{
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GClosure *closure;
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g_return_if_fail (CLUTTER_IS_ALPHA (alpha));
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g_return_if_fail (func != NULL);
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closure = g_cclosure_new (G_CALLBACK (func), data, (GClosureNotify) destroy);
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clutter_alpha_set_closure (alpha, closure);
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}
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/**
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* clutter_alpha_set_timeline:
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* @alpha: A #ClutterAlpha
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* @timeline: A #ClutterTimeline
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*
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* Binds @alpha to @timeline.
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*
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* Since: 0.2
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*/
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void
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clutter_alpha_set_timeline (ClutterAlpha *alpha,
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ClutterTimeline *timeline)
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{
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ClutterAlphaPrivate *priv;
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g_return_if_fail (CLUTTER_IS_ALPHA (alpha));
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g_return_if_fail (timeline == NULL || CLUTTER_IS_TIMELINE (timeline));
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priv = alpha->priv;
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if (priv->timeline == timeline)
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return;
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if (priv->timeline)
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{
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g_signal_handlers_disconnect_by_func (priv->timeline,
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timeline_new_frame_cb,
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alpha);
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g_object_unref (priv->timeline);
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priv->timeline = NULL;
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}
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if (timeline)
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{
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priv->timeline = g_object_ref (timeline);
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g_signal_connect (priv->timeline, "new-frame",
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G_CALLBACK (timeline_new_frame_cb),
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alpha);
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}
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g_object_notify (G_OBJECT (alpha), "timeline");
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}
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/**
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* clutter_alpha_get_timeline:
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* @alpha: A #ClutterAlpha
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*
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* Gets the #ClutterTimeline bound to @alpha.
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*
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* Return value: a #ClutterTimeline instance
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*
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* Since: 0.2
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*/
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ClutterTimeline *
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clutter_alpha_get_timeline (ClutterAlpha *alpha)
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{
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g_return_val_if_fail (CLUTTER_IS_ALPHA (alpha), NULL);
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return alpha->priv->timeline;
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}
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|
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/**
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* clutter_alpha_new:
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*
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* Creates a new #ClutterAlpha instance. You must set a function
|
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* to compute the alpha value using clutter_alpha_set_func() and
|
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* bind a #ClutterTimeline object to the #ClutterAlpha instance
|
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* using clutter_alpha_set_timeline().
|
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*
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* You should use the newly created #ClutterAlpha instance inside
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* a #ClutterBehaviour object.
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*
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* Return value: the newly created empty #ClutterAlpha instance.
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*
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* Since: 0.2
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*/
|
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ClutterAlpha *
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clutter_alpha_new (void)
|
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{
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return g_object_new (CLUTTER_TYPE_ALPHA, NULL);
|
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}
|
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|
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/**
|
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* clutter_alpha_new_full:
|
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* @timeline: #ClutterTimeline timeline
|
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* @func: #ClutterAlphaFunc alpha function
|
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* @data: data to be passed to the alpha function
|
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* @destroy: notify to be called when removing the alpha function
|
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*
|
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* Creates a new #ClutterAlpha instance and sets the timeline
|
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* and alpha function.
|
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*
|
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* Return Value: the newly created #ClutterAlpha
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*
|
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* Since: 0.2
|
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*/
|
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ClutterAlpha *
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clutter_alpha_new_full (ClutterTimeline *timeline,
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ClutterAlphaFunc func,
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gpointer data,
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GDestroyNotify destroy)
|
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{
|
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ClutterAlpha *retval;
|
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|
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g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), NULL);
|
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g_return_val_if_fail (func != NULL, NULL);
|
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|
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retval = clutter_alpha_new ();
|
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|
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clutter_alpha_set_timeline (retval, timeline);
|
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clutter_alpha_set_func (retval, func, data, destroy);
|
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|
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return retval;
|
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}
|
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|
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/**
|
|
* clutter_alpha_new_for_mode:
|
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* @mode: a #ClutterAnimationMode value
|
|
*
|
|
* Creates a new #ClutterAlpha using @mode to set the
|
|
* progress function using its symbolic name.
|
|
*
|
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* Return value: the newly created #ClutterAlpha
|
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*
|
|
* Since: 1.0
|
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*/
|
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ClutterAlpha *
|
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clutter_alpha_new_for_mode (ClutterAnimationMode mode)
|
|
{
|
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return g_object_new (CLUTTER_TYPE_ALPHA,
|
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"mode", mode,
|
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NULL);
|
|
}
|
|
|
|
/**
|
|
* clutter_alpha_get_mode:
|
|
* @alpha: a #ClutterAlpha
|
|
*
|
|
* Retrieves the #ClutterAnimatioMode used by @alpha.
|
|
*
|
|
* Return value: the animation mode
|
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*
|
|
* Since: 1.0
|
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*/
|
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ClutterAnimationMode
|
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clutter_alpha_get_mode (ClutterAlpha *alpha)
|
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{
|
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g_return_val_if_fail (CLUTTER_IS_ALPHA (alpha), CLUTTER_CUSTOM_MODE);
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|
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return alpha->priv->mode;
|
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}
|
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|
|
/* XXX - keep in sync with ClutterAnimationMode */
|
|
static const struct {
|
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ClutterAnimationMode mode;
|
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ClutterAlphaFunc func;
|
|
} animation_modes[] = {
|
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{ CLUTTER_CUSTOM_MODE, NULL },
|
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{ CLUTTER_LINEAR, clutter_ramp_inc_func },
|
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{ CLUTTER_SINE_IN, clutter_sine_in_func },
|
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{ CLUTTER_SINE_OUT, clutter_sine_out_func },
|
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{ CLUTTER_SINE_IN_OUT, clutter_sine_in_out_func },
|
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{ CLUTTER_EASE_IN, clutter_ease_in_func },
|
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{ CLUTTER_EASE_OUT, clutter_ease_out_func },
|
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{ CLUTTER_EASE_IN_OUT, clutter_ease_in_out_func },
|
|
{ CLUTTER_EXPO_IN, clutter_exp_in_func },
|
|
{ CLUTTER_EXPO_OUT, clutter_exp_out_func },
|
|
{ CLUTTER_EXPO_IN_OUT, clutter_exp_in_out_func },
|
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{ CLUTTER_SMOOTH_IN_OUT, clutter_smoothstep_inc_func }
|
|
};
|
|
|
|
/**
|
|
* clutter_alpha_set_mode:
|
|
* @alpha: a #ClutterAlpha
|
|
* @mode: a #ClutterAnimationMode
|
|
*
|
|
* Sets the progress function of @alpha using the symbolic value
|
|
* of @mode, as taken by the #ClutterAnimationMode enumeration
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
void
|
|
clutter_alpha_set_mode (ClutterAlpha *alpha,
|
|
ClutterAnimationMode mode)
|
|
{
|
|
ClutterAlphaPrivate *priv;
|
|
|
|
g_return_if_fail (CLUTTER_IS_ALPHA (alpha));
|
|
|
|
priv = alpha->priv;
|
|
|
|
/* sanity check to avoid getting an out of sync enum/function mapping */
|
|
g_assert (animation_modes[mode].mode == mode);
|
|
if (G_LIKELY (animation_modes[mode].func != NULL))
|
|
clutter_alpha_set_func (alpha, animation_modes[mode].func, NULL, NULL);
|
|
|
|
priv->mode = mode;
|
|
|
|
g_object_notify (G_OBJECT (alpha), "mode");
|
|
}
|
|
|
|
/**
|
|
* CLUTTER_ALPHA_RAMP_INC:
|
|
*
|
|
* Convenience symbol for clutter_ramp_inc_func().
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
|
|
/**
|
|
* clutter_ramp_inc_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a monotonic increasing ramp. You
|
|
* can use this function as the alpha function for clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
guint32
|
|
clutter_ramp_inc_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gint current_frame_num, n_frames;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
|
|
current_frame_num = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
return (current_frame_num * CLUTTER_ALPHA_MAX_ALPHA) / n_frames;
|
|
}
|
|
|
|
/**
|
|
* CLUTTER_ALPHA_RAMP_DEC:
|
|
*
|
|
* Convenience symbol for clutter_ramp_dec_func().
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
|
|
/**
|
|
* clutter_ramp_dec_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a monotonic decreasing ramp. You
|
|
* can use this function as the alpha function for clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
guint32
|
|
clutter_ramp_dec_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gint current_frame_num, n_frames;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
|
|
current_frame_num = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
return (n_frames - current_frame_num)
|
|
* CLUTTER_ALPHA_MAX_ALPHA
|
|
/ n_frames;
|
|
}
|
|
|
|
/**
|
|
* CLUTTER_ALPHA_RAMP:
|
|
*
|
|
* Convenience symbol for clutter_ramp_func().
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
|
|
/**
|
|
* clutter_ramp_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a full ramp function (increase for
|
|
* half the time, decrease for the remaining half). You can use this
|
|
* function as the alpha function for clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
guint32
|
|
clutter_ramp_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gint current_frame_num, n_frames;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
|
|
current_frame_num = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
if (current_frame_num > (n_frames / 2))
|
|
{
|
|
return (n_frames - current_frame_num)
|
|
* CLUTTER_ALPHA_MAX_ALPHA
|
|
/ (n_frames / 2);
|
|
}
|
|
else
|
|
{
|
|
return current_frame_num
|
|
* CLUTTER_ALPHA_MAX_ALPHA
|
|
/ (n_frames / 2);
|
|
}
|
|
}
|
|
|
|
static guint32
|
|
sincx1024_func (ClutterAlpha *alpha,
|
|
ClutterAngle angle,
|
|
ClutterFixed offset)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gint current_frame_num, n_frames;
|
|
ClutterAngle x;
|
|
ClutterFixed sine;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
|
|
current_frame_num = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
x = angle * current_frame_num / n_frames;
|
|
|
|
x -= (512 * 512 / angle);
|
|
|
|
sine = ((cogl_angle_sin (x) + offset) / 2)
|
|
* CLUTTER_ALPHA_MAX_ALPHA;
|
|
|
|
sine = sine >> COGL_FIXED_Q;
|
|
|
|
return sine;
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* The following two functions are left in place for reference
|
|
* purposes.
|
|
*/
|
|
static guint32
|
|
sincx_func (ClutterAlpha *alpha,
|
|
ClutterFixed angle,
|
|
ClutterFixed offset)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gint current_frame_num, n_frames;
|
|
ClutterFixed x, sine;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
|
|
current_frame_num = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
x = angle * current_frame_num / n_frames;
|
|
x = COGL_FIXED_FAST_MUL (x, COGL_FIXED_PI)
|
|
- COGL_FIXED_FAST_DIV (COGL_FIXED_PI, angle);
|
|
|
|
sine = (cogl_fixed_sin (x) + offset) / 2;
|
|
|
|
CLUTTER_NOTE (ALPHA, "sine: %2f\n", COGL_FIXED_TO_DOUBLE (sine));
|
|
|
|
return COGL_FIXED_TO_INT (sine * CLUTTER_ALPHA_MAX_ALPHA);
|
|
}
|
|
|
|
/* NB: angle is not in radians but in muliples of PI, i.e., 2.0
|
|
* represents full circle.
|
|
*/
|
|
static guint32
|
|
sinc_func (ClutterAlpha *alpha,
|
|
float angle,
|
|
float offset)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gint current_frame_num, n_frames;
|
|
gdouble x, sine;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
|
|
current_frame_num = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
/* FIXME: fixed point, and fixed point sine() */
|
|
|
|
x = (gdouble) (current_frame_num * angle * G_PI) / n_frames ;
|
|
sine = (sin (x - (G_PI / angle)) + offset) * 0.5f;
|
|
|
|
CLUTTER_NOTE (ALPHA, "sine: %2f\n",sine);
|
|
|
|
return COGL_FLOAT_TO_INT ((sine * (gdouble) CLUTTER_ALPHA_MAX_ALPHA));
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* CLUTTER_ALPHA_SINE:
|
|
*
|
|
* Convenience symbol for clutter_sine_func().
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
|
|
/**
|
|
* clutter_sine_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a sine wave. You can use this
|
|
* function as the alpha function for clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
guint32
|
|
clutter_sine_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
#if 0
|
|
return sinc_func (alpha, 2.0, 1.0);
|
|
#else
|
|
/* 2.0 above represents full circle */
|
|
return sincx1024_func (alpha, 1024, COGL_FIXED_1);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* CLUTTER_ALPHA_SINE_INC:
|
|
*
|
|
* Convenience symbol for clutter_sine_inc_func().
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
|
|
/**
|
|
* clutter_sine_inc_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a sine wave over interval [0, pi / 2].
|
|
* You can use this function as the alpha function for
|
|
* clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
guint32
|
|
clutter_sine_inc_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline * timeline;
|
|
gint frame;
|
|
gint n_frames;
|
|
ClutterAngle x;
|
|
ClutterFixed sine;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
frame = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
x = 256 * frame / n_frames;
|
|
|
|
sine = cogl_angle_sin (x) * CLUTTER_ALPHA_MAX_ALPHA;
|
|
|
|
return ((guint32) sine) >> COGL_FIXED_Q;
|
|
}
|
|
|
|
/**
|
|
* CLUTTER_ALPHA_SINE_DEC:
|
|
*
|
|
* Convenience symbol for clutter_sine_dec_func().
|
|
*
|
|
* Since: 0.2
|
|
*/
|
|
|
|
/**
|
|
* clutter_sine_dec_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a sine wave over interval [pi / 2, pi].
|
|
* You can use this function as the alpha function for
|
|
* clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
guint32
|
|
clutter_sine_dec_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline * timeline;
|
|
gint frame;
|
|
gint n_frames;
|
|
ClutterAngle x;
|
|
ClutterFixed sine;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
frame = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
x = 256 * frame / n_frames + 256;
|
|
|
|
sine = cogl_angle_sin (x) * CLUTTER_ALPHA_MAX_ALPHA;
|
|
|
|
return ((guint32) sine) >> COGL_FIXED_Q;
|
|
}
|
|
|
|
/**
|
|
* CLUTTER_ALPHA_SINE_HALF:
|
|
*
|
|
* Convenience symbol for clutter_sine_half_func().
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
|
|
/**
|
|
* clutter_sine_half_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a sine wave over interval [0, pi].
|
|
* You can use this function as the alpha function for
|
|
* clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
guint32
|
|
clutter_sine_half_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gint frame;
|
|
gint n_frames;
|
|
ClutterAngle x;
|
|
ClutterFixed sine;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
frame = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
x = 512 * frame / n_frames;
|
|
|
|
sine = cogl_angle_sin (x) * CLUTTER_ALPHA_MAX_ALPHA;
|
|
|
|
return ((guint32) sine) >> COGL_FIXED_Q;
|
|
}
|
|
|
|
/**
|
|
* clutter_sine_in_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for (sin(x) + 1) over the
|
|
* interval [-pi/2, 0].
|
|
*
|
|
* You can use this function as the alpha function for
|
|
* clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
guint32
|
|
clutter_sine_in_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gint frame;
|
|
gint n_frames;
|
|
ClutterAngle x;
|
|
ClutterFixed sine;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
frame = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
/* XXX- if we use 768 we overflow */
|
|
x = 256 * frame / n_frames + 767;
|
|
|
|
sine = (cogl_angle_sin (x) + 1) * CLUTTER_ALPHA_MAX_ALPHA;
|
|
|
|
return ((guint32) sine) >> COGL_FIXED_Q;
|
|
}
|
|
|
|
/**
|
|
* clutter_sine_in_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for sin(x) over the interval [0, pi/2].
|
|
*
|
|
* You can use this function as the alpha function for
|
|
* clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
guint32
|
|
clutter_sine_out_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gint frame;
|
|
gint n_frames;
|
|
ClutterAngle x;
|
|
ClutterFixed sine;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
frame = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
x = 256 * frame / n_frames;
|
|
|
|
sine = cogl_angle_sin (x) * CLUTTER_ALPHA_MAX_ALPHA;
|
|
|
|
return ((guint32) sine) >> COGL_FIXED_Q;
|
|
}
|
|
|
|
/**
|
|
* clutter_sine_in_out_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for (sin(x) + 1) / 2 over the
|
|
* interval [-pi/2, pi/2].
|
|
*
|
|
* You can use this function as the alpha function for
|
|
* clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
guint32
|
|
clutter_sine_in_out_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gint frame;
|
|
gint n_frames;
|
|
ClutterAngle x;
|
|
ClutterFixed sine;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
frame = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
x = -256 * frame / n_frames + 256;
|
|
|
|
sine = (cogl_angle_sin (x) + 1) / 2 * CLUTTER_ALPHA_MAX_ALPHA;
|
|
|
|
return ((guint32) sine) >> COGL_FIXED_Q;
|
|
}
|
|
|
|
/**
|
|
* CLUTTER_ALPHA_SQUARE:
|
|
*
|
|
* Convenience symbol for clutter_square_func().
|
|
*
|
|
* Since: 0.4
|
|
*
|
|
* Deprecated: 1.0: Use clutter_square_func() instead
|
|
*/
|
|
|
|
/**
|
|
* clutter_square_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a square wave. You can use this
|
|
* function as the alpha function for clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
guint32
|
|
clutter_square_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gint current_frame_num, n_frames;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
|
|
current_frame_num = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
return (current_frame_num > (n_frames / 2)) ? CLUTTER_ALPHA_MAX_ALPHA
|
|
: 0;
|
|
}
|
|
|
|
/**
|
|
* CLUTTER_ALPHA_SMOOTHSTEP_INC:
|
|
*
|
|
* Convenience symbol for clutter_smoothstep_inc_func().
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
|
|
/**
|
|
* clutter_smoothstep_inc_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused
|
|
*
|
|
* Convenience alpha function for a smoothstep curve. You can use this
|
|
* function as the alpha function for clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
guint32
|
|
clutter_smoothstep_inc_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gint frame;
|
|
gint n_frames;
|
|
guint32 r;
|
|
guint32 x;
|
|
|
|
/*
|
|
* The smoothstep function uses f(x) = -2x^3 + 3x^2 where x is from <0,1>,
|
|
* and precission is critical -- we use 8.24 fixed format for this operation.
|
|
* The earlier operations involve division, which we cannot do in 8.24 for
|
|
* numbers in <0,1> we use ClutterFixed.
|
|
*/
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
frame = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
/*
|
|
* Convert x to 8.24 for next step.
|
|
*/
|
|
x = COGL_FIXED_FAST_DIV (frame, n_frames) << 8;
|
|
|
|
/*
|
|
* f(x) = -2x^3 + 3x^2
|
|
*
|
|
* Convert result to ClutterFixed to avoid overflow in next step.
|
|
*/
|
|
r = ((x >> 12) * (x >> 12) * 3 - (x >> 15) * (x >> 16) * (x >> 16)) >> 8;
|
|
|
|
return COGL_FIXED_TO_INT (r * CLUTTER_ALPHA_MAX_ALPHA);
|
|
}
|
|
|
|
/**
|
|
* CLUTTER_ALPHA_SMOOTHSTEP_DEC:
|
|
*
|
|
* Convenience symbol for clutter_smoothstep_dec_func().
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
|
|
/**
|
|
* clutter_smoothstep_dec_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused
|
|
*
|
|
* Convenience alpha function for a downward smoothstep curve. You can use
|
|
* this function as the alpha function for clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
guint32
|
|
clutter_smoothstep_dec_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
return CLUTTER_ALPHA_MAX_ALPHA - clutter_smoothstep_inc_func (alpha, dummy);
|
|
}
|
|
|
|
/**
|
|
* CLUTTER_ALPHA_EXP_INC:
|
|
*
|
|
* Convenience symbol for clutter_exp_inc_func()
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
|
|
/**
|
|
* clutter_exp_inc_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a 2^x curve. You can use this function as the
|
|
* alpha function for clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
guint32
|
|
clutter_exp_inc_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline * timeline;
|
|
gint frame;
|
|
gint n_frames;
|
|
ClutterFixed x;
|
|
ClutterFixed x_alpha_max = 0x100000;
|
|
guint32 result;
|
|
|
|
/*
|
|
* Choose x_alpha_max such that
|
|
*
|
|
* (2^x_alpha_max) - 1 == CLUTTER_ALPHA_MAX_ALPHA
|
|
*/
|
|
#if CLUTTER_ALPHA_MAX_ALPHA != 0xffff
|
|
#error Adjust x_alpha_max to match CLUTTER_ALPHA_MAX_ALPHA
|
|
#endif
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
frame = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
x = x_alpha_max * frame / n_frames;
|
|
|
|
result = CLAMP (cogl_fixed_pow2 (x) - 1, 0, CLUTTER_ALPHA_MAX_ALPHA);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* CLUTTER_ALPHA_EXP_DEC:
|
|
*
|
|
* Convenience symbold for clutter_exp_dec_func().
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
|
|
/**
|
|
* clutter_exp_dec_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a decreasing 2^x curve. You can use this
|
|
* function as the alpha function for clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
guint32
|
|
clutter_exp_dec_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline * timeline;
|
|
gint frame;
|
|
gint n_frames;
|
|
ClutterFixed x;
|
|
ClutterFixed x_alpha_max = 0x100000;
|
|
guint32 result;
|
|
|
|
/*
|
|
* Choose x_alpha_max such that
|
|
*
|
|
* (2^x_alpha_max) - 1 == CLUTTER_ALPHA_MAX_ALPHA
|
|
*/
|
|
#if CLUTTER_ALPHA_MAX_ALPHA != 0xffff
|
|
#error Adjust x_alpha_max to match CLUTTER_ALPHA_MAX_ALPHA
|
|
#endif
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
frame = clutter_timeline_get_current_frame (timeline);
|
|
n_frames = clutter_timeline_get_n_frames (timeline);
|
|
|
|
x = (x_alpha_max * (n_frames - frame)) / n_frames;
|
|
|
|
result = CLAMP (cogl_fixed_pow2 (x) - 1, 0, CLUTTER_ALPHA_MAX_ALPHA);
|
|
|
|
return result;
|
|
}
|
|
|
|
static inline gdouble
|
|
clutter_cubic_bezier (ClutterAlpha *alpha,
|
|
gdouble x_1,
|
|
gdouble y_1,
|
|
gdouble x_2,
|
|
gdouble y_2)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gdouble t, b_t, res;
|
|
|
|
/* the cubic bezier has a parametric form of:
|
|
*
|
|
* B(t) = (1 - t)^3 * P_0
|
|
* + 3t * (1 - t)^2 * P_1
|
|
* + 3t^2 * (1 - t) * P_2
|
|
* + t^3 * P_3 (with t included in [0, 1])
|
|
*
|
|
* the P_0 and P_3 points are set to (0, 0) and (1, 1) respectively,
|
|
* and the curve never passes through P_1 and P_2 - with these two
|
|
* points merely acting as control points for the curve starting
|
|
* from P_0 and ending at P_3.
|
|
*
|
|
* since the starting point is (0, 0) we can simplify the previous
|
|
* parametric form to:
|
|
*
|
|
* B(t) = 3t * (1 - t)^2 * P_1
|
|
* + 3t^2 * (1 - t) * P_2
|
|
* + t^3 * P_3 (with t included in [0, 1])
|
|
*
|
|
* and, similarly, since the final point is (1, 1) we can simplify
|
|
* it further to:
|
|
*
|
|
* B(t) = 3t * (1 - t)^2 * P_1
|
|
* + 3t^2 * (1 - t) * P_2
|
|
* + t^3 (with t included in [0, 1])
|
|
*
|
|
* since an alpha function has only a time parameter and we have two
|
|
* coordinates for each point, we pass the time as the first
|
|
* coordinate for the point and then we solve the cubic beziér curve
|
|
* for the second coordinate at the same point.
|
|
*/
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
t = clutter_timeline_get_progress (timeline);
|
|
|
|
b_t = 3 * t * pow (1 - t, 2) * x_1
|
|
+ 3 * pow (t, 2) * (1 - t) * x_2
|
|
+ pow (t, 3);
|
|
|
|
res = 3 * b_t * pow (1 - b_t, 2) * y_1
|
|
+ 3 * pow (b_t, 2) * (1 - b_t) * y_2
|
|
+ pow (b_t, 3);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* clutter_ease_in_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a cubic Beziér curve with control
|
|
* points at (0.42, 0) and (1, 0). You can use this function as the
|
|
* alpha function for clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
guint32
|
|
clutter_ease_in_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
gdouble res;
|
|
|
|
res = clutter_cubic_bezier (alpha, 0.42, 0, 1, 0);
|
|
|
|
return CLAMP (res * CLUTTER_ALPHA_MAX_ALPHA, 0, CLUTTER_ALPHA_MAX_ALPHA);
|
|
}
|
|
|
|
/**
|
|
* clutter_ease_out_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a cubic Beziér curve with control
|
|
* points at (0, 0) and (0.58, 1). You can use this function as the
|
|
* alpha function for clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
guint32
|
|
clutter_ease_out_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
gdouble res;
|
|
|
|
res = clutter_cubic_bezier (alpha, 0, 0, 0.58, 1);
|
|
|
|
return CLAMP (res * CLUTTER_ALPHA_MAX_ALPHA, 0, CLUTTER_ALPHA_MAX_ALPHA);
|
|
}
|
|
|
|
/**
|
|
* clutter_ease_in_out_func:
|
|
* @alpha: a #ClutterAlpha
|
|
* @dummy: unused argument
|
|
*
|
|
* Convenience alpha function for a cubic Beziér curve with control
|
|
* points at (0.42, 0) and (0.58, 1). You can use this function as
|
|
* the alpha function for clutter_alpha_set_func().
|
|
*
|
|
* Return value: an alpha value.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
guint32
|
|
clutter_ease_in_out_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
gdouble res;
|
|
|
|
res = clutter_cubic_bezier (alpha, 0.42, 0, 0.58, 1);
|
|
|
|
return CLAMP (res * CLUTTER_ALPHA_MAX_ALPHA, 0, CLUTTER_ALPHA_MAX_ALPHA);
|
|
}
|
|
|
|
guint32
|
|
clutter_exp_in_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gdouble progress, res;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
progress = clutter_timeline_get_progress (timeline);
|
|
|
|
res = pow (2, 10 * (progress - 1));
|
|
res = CLAMP (res * CLUTTER_ALPHA_MAX_ALPHA, 0, CLUTTER_ALPHA_MAX_ALPHA);
|
|
|
|
return res;
|
|
}
|
|
|
|
guint32
|
|
clutter_exp_out_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gdouble progress, res;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
progress = clutter_timeline_get_progress (timeline);
|
|
|
|
res = -pow (2, (-10 * progress)) + 1;
|
|
res = CLAMP (res * CLUTTER_ALPHA_MAX_ALPHA, 0, CLUTTER_ALPHA_MAX_ALPHA);
|
|
|
|
return res;
|
|
}
|
|
|
|
guint32
|
|
clutter_exp_in_out_func (ClutterAlpha *alpha,
|
|
gpointer dummy)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
gdouble progress, res;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
progress = clutter_timeline_get_progress (timeline);
|
|
|
|
if (progress < 0.5)
|
|
res = 0.5 * pow (2, (10 * (progress - 1)));
|
|
else
|
|
res = 0.5 * -pow (2, (-10 * progress)) + 1;
|
|
|
|
res = CLAMP (res * CLUTTER_ALPHA_MAX_ALPHA, 0, CLUTTER_ALPHA_MAX_ALPHA);
|
|
|
|
return res;
|
|
}
|