mirror of
https://github.com/brl/mutter.git
synced 2024-09-20 14:35:48 -04:00
3014d4ff8a
Okey; to summarise the changes... We have converted Clutter and Cogl over to using floating point internally instead of 16.16 fixed, but we have maintained the cogl-fixed API as a utility to applications in case they want to implement their own optimizations. The Clutter API has not changed (though ClutterFixed and ClutterUnit are now internally floats) but all Cogl entry points have been changed to accept floats now instead of CoglFixed. To summarise the rationale... There have been a number of issues with using fixed point though out Clutter and Cogl including: lack of precision, lack of range, excessive format conversion (GPUs tend to work nativly with IEEE floats) and maintainability. One of the main arguments for fixed point - performance - hasn't shown itself to be serious in practice so far since we seem to be more limited by GPU performance and making improvements regarding how we submit data to OpenGL[ES]/the GPU has had a more significant impact. Ref: The recent multiple rectangle queuing changes + the cogl-texture-agressive-batching branch which show significant performance gains, and that recent tests on the ipodtouch (ARM + MBX) also showed no loss of performance running with floats. So finally; please forgive the inevitable fallout, this is a far reaching change. There are still a few known issues with the fixed to float conversion but enough works for all our conformance tests to pass, and the remaining issues hopefully wont be too tricky to solve. For reference two tags will be available either side of this change: "cogl-fixed-end" and "cogl-float-start"
133 lines
4.8 KiB
C
133 lines
4.8 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, 2008 OpenedHand
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* Copyright (C) 2009 Intel Corp.
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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, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
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#error "Only <clutter/clutter.h> can be included directly."
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#endif
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#ifndef __CLUTTER_ALPHA_H__
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#define __CLUTTER_ALPHA_H__
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#include <clutter/clutter-timeline.h>
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#include <clutter/clutter-types.h>
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G_BEGIN_DECLS
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#define CLUTTER_TYPE_ALPHA (clutter_alpha_get_type ())
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#define CLUTTER_ALPHA(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_ALPHA, ClutterAlpha))
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#define CLUTTER_ALPHA_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_ALPHA, ClutterAlphaClass))
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#define CLUTTER_IS_ALPHA(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_ALPHA))
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#define CLUTTER_IS_ALPHA_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_ALPHA))
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#define CLUTTER_ALPHA_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_ALPHA, ClutterAlphaClass))
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typedef struct _ClutterAlpha ClutterAlpha;
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typedef struct _ClutterAlphaClass ClutterAlphaClass;
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typedef struct _ClutterAlphaPrivate ClutterAlphaPrivate;
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/**
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* ClutterAlphaFunc:
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* @alpha: a #ClutterAlpha
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* @user_data: user data passed to the function
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*
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* A function returning a value depending on the position of
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* the #ClutterTimeline bound to @alpha.
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*
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* Return value: a floating point value
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*
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* Since: 0.2
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*/
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typedef gdouble (*ClutterAlphaFunc) (ClutterAlpha *alpha,
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gpointer user_data);
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/**
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* ClutterAlpha:
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*
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* #ClutterAlpha combines a #ClutterTimeline and a function.
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* The contents of the #ClutterAlpha structure are private and should
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* only be accessed using the provided API.
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*
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* Since: 0.2
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*/
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struct _ClutterAlpha
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{
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/*< private >*/
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GInitiallyUnowned parent;
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ClutterAlphaPrivate *priv;
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};
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/**
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* ClutterAlphaClass:
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*
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* Base class for #ClutterAlpha
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*
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* Since: 0.2
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*/
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struct _ClutterAlphaClass
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{
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/*< private >*/
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GInitiallyUnownedClass parent_class;
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void (*_clutter_alpha_1) (void);
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void (*_clutter_alpha_2) (void);
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void (*_clutter_alpha_3) (void);
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void (*_clutter_alpha_4) (void);
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void (*_clutter_alpha_5) (void);
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};
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GType clutter_alpha_get_type (void) G_GNUC_CONST;
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ClutterAlpha * clutter_alpha_new (void);
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ClutterAlpha * clutter_alpha_new_full (ClutterTimeline *timeline,
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gulong mode);
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ClutterAlpha * clutter_alpha_new_with_func (ClutterTimeline *timeline,
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ClutterAlphaFunc func,
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gpointer data,
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GDestroyNotify destroy);
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gdouble clutter_alpha_get_alpha (ClutterAlpha *alpha);
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void 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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void clutter_alpha_set_closure (ClutterAlpha *alpha,
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GClosure *closure);
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void clutter_alpha_set_timeline (ClutterAlpha *alpha,
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ClutterTimeline *timeline);
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ClutterTimeline *clutter_alpha_get_timeline (ClutterAlpha *alpha);
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void clutter_alpha_set_mode (ClutterAlpha *alpha,
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gulong mode);
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gulong clutter_alpha_get_mode (ClutterAlpha *alpha);
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gulong clutter_alpha_register_func (ClutterAlphaFunc func,
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gpointer data);
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gulong clutter_alpha_register_closure (GClosure *closure);
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G_END_DECLS
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#endif /* __CLUTTER_ALPHA_H__ */
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