e82f656590
This is the result of running a number of sed and perl scripts over the code to
do 90% of the work in converting from 16.16 fixed to single precision floating
point.
Note: A pristine cogl-fixed.c has been maintained as a standalone utility API
so that applications may still take advantage of fixed point if they
desire for certain optimisations where lower precision may be acceptable.
Note: no API changes were made in Clutter, only in Cogl.
Overview of changes:
- Within clutter/* all usage of the COGL_FIXED_ macros have been changed to use
the CLUTTER_FIXED_ macros.
- Within cogl/* all usage of the COGL_FIXED_ macros have been completly stripped
and expanded into code that works with single precision floats instead.
- Uses of cogl_fixed_* have been replaced with single precision math.h
alternatives.
- Uses of COGL_ANGLE_* and cogl_angle_* have been replaced so we use a float for
angles and math.h replacements.
385 lines
8.7 KiB
C
385 lines
8.7 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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* Tomas Frydrych <tf@openedhand.com>
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*
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* Copyright (C) 2006 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, 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_FIXED_H__
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#define __CLUTTER_FIXED_H__
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#include <glib-object.h>
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#include <cogl/cogl.h>
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G_BEGIN_DECLS
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/**
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* ClutterFixed:
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*
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* Fixed point number (16.16)
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*/
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typedef float ClutterFixed;
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/**
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* ClutterAngle:
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*
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* Integer representation of an angle such that 1024 corresponds to
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* full circle (i.e., 2*Pi).
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*/
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typedef float ClutterAngle; /* angle such that 1024 == 2*PI */
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#define CLUTTER_ANGLE_FROM_DEG(x) (COGL_ANGLE_FROM_DEG (x))
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#define CLUTTER_ANGLE_FROM_DEGX(x) (COGL_ANGLE_FROM_DEGX (x))
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#define CLUTTER_ANGLE_TO_DEG(x) (COGL_ANGLE_TO_DEG (x))
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#define CLUTTER_ANGLE_TO_DEGX(x) (COGL_ANGLE_TO_DEGX (x))
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/*
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* some commonly used constants
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*/
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/**
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* CFX_Q:
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*
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* Size in bits of decimal part of floating point value.
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*/
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#define CFX_Q COGL_FIXED_Q
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/**
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* CFX_ONE:
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*
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* 1.0 represented as a fixed point value.
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*/
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#define CFX_ONE 1.0
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/**
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* CFX_HALF:
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*
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* 0.5 represented as a fixed point value.
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*/
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#define CFX_HALF 0.5
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/**
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* CFX_MAX:
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*
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* Maximum fixed point value.
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*/
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#define CFX_MAX COGL_FIXED_MAX
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/**
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* CFX_MIN:
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*
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* Minimum fixed point value.
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*/
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#define CFX_MIN COGL_FIXED_MIN
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/**
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* CFX_PI:
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*
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* Fixed point representation of Pi
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*/
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#define CFX_PI G_PI
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/**
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* CFX_2PI:
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*
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* Fixed point representation of Pi*2
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*/
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#define CFX_2PI COGL_FIXED_2_PI
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/**
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* CFX_PI_2:
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*
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* Fixed point representation of Pi/2
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*/
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#define CFX_PI_2 G_PI_2
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/**
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* CFX_PI_4:
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*
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* Fixed point representation of Pi/4
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*/
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#define CFX_PI_4 G_PI_4
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/**
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* CFX_360:
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*
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* Fixed point representation of the number 360
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*/
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#define CFX_360 360.0
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/**
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* CFX_240:
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*
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* Fixed point representation of the number 240
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*/
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#define CFX_240 240.0
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/**
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* CFX_180:
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*
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* Fixed point representation of the number 180
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*/
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#define CFX_180 180.0
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/**
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* CFX_120:
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*
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* Fixed point representation of the number 120
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*/
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#define CFX_120 120.0
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/**
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* CFX_60:
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*
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* Fixed point representation of the number 60
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*/
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#define CFX_60 60.0
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/**
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* CFX_RADIANS_TO_DEGREES:
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*
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* Fixed point representation of the number 180 / pi
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*/
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#define CFX_RADIANS_TO_DEGREES COGL_RADIANS_TO_DEGREES
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/**
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* CFX_255:
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*
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* Fixed point representation of the number 255
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*/
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#define CFX_255 255.0
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/**
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* CLUTTER_FIXED_TO_FLOAT:
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* @x: a fixed point value
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*
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* Convert a fixed point value to float.
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*/
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#define CLUTTER_FIXED_TO_FLOAT(x) ((x))
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/**
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* CLUTTER_FIXED_TO_DOUBLE:
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* @x: a fixed point value
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*
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* Convert a fixed point value to double.
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*/
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#define CLUTTER_FIXED_TO_DOUBLE(x) (double)((x))
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/**
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* CLUTTER_FLOAT_TO_FIXED:
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* @x: a floating point value
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*
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* Convert a float value to fixed.
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*/
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#define CLUTTER_FLOAT_TO_FIXED(x) ((x))
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/**
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* CLUTTER_FLOAT_TO_INT:
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* @x: a floating point value
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*
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* Convert a float value to int.
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*/
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#define CLUTTER_FLOAT_TO_INT(x) COGL_FLOAT_TO_INT ((x))
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/**
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* CLUTTER_FLOAT_TO_UINT:
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* @x: a floating point value
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*
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* Convert a float value to unsigned int.
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*/
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#define CLUTTER_FLOAT_TO_UINT(x) COGL_FLOAT_TO_UINT ((x))
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/**
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* CLUTTER_INT_TO_FIXED:
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* @x: an integer value
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*
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* Convert an integer value to fixed point.
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*/
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#define CLUTTER_INT_TO_FIXED(x) (float)((x))
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/**
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* CLUTTER_FIXED_TO_INT:
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* @x: a fixed point value
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*
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* Converts a fixed point value to integer (removing the decimal part).
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*
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* Since: 0.6
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*/
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#define CLUTTER_FIXED_TO_INT(x) ((x))
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/**
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* CLUTTER_FIXED_FRACTION:
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* @x: a fixed point value
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*
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* Retrieves the fractionary part of a fixed point value
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*/
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#define CLUTTER_FIXED_FRACTION(x) COGL_FIXED_FRACTION ((x))
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/**
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* CLUTTER_FIXED_FLOOR:
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* @x: a fixed point value
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*
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* Round down a fixed point value to an integer.
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*/
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#define CLUTTER_FIXED_FLOOR(x) floorf ((x))
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/**
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* CLUTTER_FIXED_CEIL:
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* @x: a fixed point value
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*
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* Round up a fixed point value to an integer.
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*/
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#define CLUTTER_FIXED_CEIL(x) ceilf ((x))
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/**
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* CLUTTER_FIXED_MUL:
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* @x: a fixed point value
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* @y: a fixed point value
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*
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* Multiply two fixed point values
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*/
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#define CLUTTER_FIXED_MUL(x,y) ((x) * (y))
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/**
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* CLUTTER_FIXED_DIV:
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* @x: a fixed point value
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* @y: a fixed point value
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*
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* Divide two fixed point values
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*/
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#define CLUTTER_FIXED_DIV(x,y) ((x) / (y))
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#define clutter_qmulx(x,y) ((x) * (y))
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#define clutter_qdivx(x,y) ((x) / (y))
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#define clutter_sinx(a) sinf ((a))
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#define clutter_sini(a) sinf ((a * (G_PI/180.0)))
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#define clutter_tani(a) tanf ((a * (G_PI/180.0)))
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#define clutter_atani(a) atanf ((a))
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#define clutter_atan2i(x,y) atan2f ((x), (y))
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#define clutter_cosx(a) cosf ((a))
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#define clutter_cosi(a) cosf ((a * (G_PI/180.0)))
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/**
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* CLUTTER_SQRTI_ARG_MAX
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*
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* Maximum argument that can be passed to #clutter_sqrti function.
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*
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* Since: 0.6
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*/
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#define CLUTTER_SQRTI_ARG_MAX COGL_SQRTI_ARG_MAX
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/**
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* CLUTTER_SQRTI_ARG_5_PERCENT
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*
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* Maximum argument that can be passed to #clutter_sqrti for which the
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* resulting error is < 5%
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*
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* Since: 0.6
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*/
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#define CLUTTER_SQRTI_ARG_5_PERCENT COGL_SQRTI_ARG_5_PERCENT
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/**
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* CLUTTER_SQRTI_ARG_10_PERCENT
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*
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* Maximum argument that can be passed to #clutter_sqrti for which the
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* resulting error is < 10%
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*
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* Since: 0.6
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*/
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#define CLUTTER_SQRTI_ARG_10_PERCENT COGL_SQRTI_ARG_10_PERCENT
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#define clutter_sqrtx(x) sqrtf ((x))
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#define clutter_sqrti(x) cogl_sqrti ((x))
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#define clutter_log2x(x) log2f ((x))
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#define clutter_pow2x(x) pow2f ((x))
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#define clutter_powx(x,y) powf ((x), (y))
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#define CLUTTER_TYPE_FIXED (clutter_fixed_get_type ())
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#define CLUTTER_TYPE_PARAM_FIXED (clutter_param_fixed_get_type ())
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#define CLUTTER_PARAM_SPEC_FIXED(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), CLUTTER_TYPE_PARAM_FIXED, ClutterParamSpecFixed))
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#define CLUTTER_IS_PARAM_SPEC_FIXED(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), CLUTTER_TYPE_PARAM_FIXED))
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/**
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* CLUTTER_VALUE_HOLDS_FIXED:
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* @x: a #GValue
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*
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* Evaluates to %TRUE if @x holds a #ClutterFixed.
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*
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* Since: 0.8
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*/
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#define CLUTTER_VALUE_HOLDS_FIXED(x) (G_VALUE_HOLDS ((x), CLUTTER_TYPE_FIXED))
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typedef struct _ClutterParamSpecFixed ClutterParamSpecFixed;
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/**
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* CLUTTER_MAXFIXED:
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*
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* Higher boundary for #ClutterFixed
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*
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* Since: 0.8
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*/
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#define CLUTTER_MAXFIXED COGL_FIXED_MAX
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/**
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* CLUTTER_MINFIXED:
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*
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* Lower boundary for #ClutterFixed
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*
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* Since: 0.8
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*/
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#define CLUTTER_MINFIXED COGL_FIXED_MIN
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/**
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* ClutterParamSpecFixed
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* @minimum: lower boundary
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* @maximum: higher boundary
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* @default_value: default value
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*
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* #GParamSpec subclass for fixed point based properties
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*
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* Since: 0.8
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*/
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struct _ClutterParamSpecFixed
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{
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/*< private >*/
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GParamSpec parent_instance;
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/*< public >*/
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ClutterFixed minimum;
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ClutterFixed maximum;
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ClutterFixed default_value;
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};
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GType clutter_fixed_get_type (void) G_GNUC_CONST;
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GType clutter_param_fixed_get_type (void) G_GNUC_CONST;
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void clutter_value_set_fixed (GValue *value,
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ClutterFixed fixed_);
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ClutterFixed clutter_value_get_fixed (const GValue *value);
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GParamSpec * clutter_param_spec_fixed (const gchar *name,
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const gchar *nick,
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const gchar *blurb,
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ClutterFixed minimum,
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ClutterFixed maximum,
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ClutterFixed default_value,
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GParamFlags flags);
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G_END_DECLS
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#endif /* __CLUTTER_FIXED_H__ */
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