mutter/clutter/clutter-fixed.h

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
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* Tomas Frydrych <tf@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef _HAVE_CLUTTER_FIXED_H
#define _HAVE_CLUTTER_FIXED_H
#include <glib.h>
G_BEGIN_DECLS
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/**
* ClutterFixed:
*
* Fixed point number (16.16)
*/
typedef gint32 ClutterFixed;
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/**
* ClutterAngle:
*
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* Integer representation of an angle such that 1024 corresponds to
* full circle (i.e., 2*Pi).
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*/
typedef gint32 ClutterAngle; /* angle such that 1024 == 2*PI */
#define CLUTTER_ANGLE_FROM_DEG(x) CLUTTER_FLOAT_TO_INT((x*1024.0)/360.0)
#define CLUTTER_ANGLE_FROM_DEGF(x) CLUTTER_FLOAT_TO_INT(((float)x*1024.0f)/360.0f)
#define CLUTTER_ANGLE_TO_DEGF(x) (((float)x * 360.0)/ 1024.0)
#define CLUTTER_ANGLE_FROM_DEGX(x) CFX_INT(((x/360)*1024) + CFX_HALF)
#define CFX_Q 16 /* Decimal part size in bits */
#define CFX_ONE (1 << CFX_Q) /* 1 */
#define CFX_HALF 32768
#define CFX_MAX 0x7fffffff
#define CFX_MIN 0x80000000
/*
* some commonly used constants
*/
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/**
* CFX_PI:
*
* Fixed point representation of Pi
*/
#define CFX_PI 0x0003243f
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/**
* CFX_2PI:
*
* Fixed point representation of Pi*2
*/
#define CFX_2PI 0x0006487f
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/**
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* CFX_PI_2:
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*
* Fixed point representation of Pi/2
*/
#define CFX_PI_2 0x00019220 /* pi/2 */
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/**
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* CFX_PI_4:
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*
* Fixed point representation of Pi/4
*/
#define CFX_PI_4 0x0000c910 /* pi/4 */
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/**
* CFX_360:
*
* Fixed point representation of the number 360
*/
#define CFX_360 CLUTTER_INT_TO_FIXED (360)
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/**
* CFX_240:
*
* Fixed point representation of the number 240
*/
#define CFX_240 CLUTTER_INT_TO_FIXED (240)
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/**
* CFX_180:
*
* Fixed point representation of the number 180
*/
#define CFX_180 CLUTTER_INT_TO_FIXED (180)
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/**
* CFX_120:
*
* Fixed point representation of the number 120
*/
#define CFX_120 CLUTTER_INT_TO_FIXED (120)
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/**
* CFX_60:
*
* Fixed point representation of the number 60
*/
#define CFX_60 CLUTTER_INT_TO_FIXED (60)
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/**
* CFX_255:
*
* Fixed point representation of the number 255
*/
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#define CFX_255 CLUTTER_INT_TO_FIXED (255)
#define CLUTTER_FIXED_TO_FLOAT(x) ((float) ((int)(x) / 65536.0))
#define CLUTTER_FIXED_TO_DOUBLE(x) ((double) ((int)(x) / 65536.0))
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#define CLUTTER_FLOAT_TO_FIXED(x) _clutter_double_to_fixed((x))
#define CLUTTER_FLOAT_TO_INT(x) _clutter_double_to_int((x))
#define CLUTTER_INT_TO_FIXED(x) ((x) << CFX_Q)
#define CLUTTER_FIXED_INT(x) ((x) >> CFX_Q)
#define CLUTTER_FIXED_FRACTION(x) ((x) & ((1 << CFX_Q) - 1))
#define CLUTTER_FIXED_FLOOR(x) (((x) >= 0) ? ((x) >> CFX_Q) \
: ~((~(x)) >> CFX_Q))
#define CLUTTER_FIXED_CEIL(x) CLUTTER_FIXED_FLOOR(x + 0xffff)
#define CLUTTER_FIXED_MUL(x,y) ((x) >> 8) * ((y) >> 8)
#define CLUTTER_FIXED_DIV(x,y) ((((x) << 8)/(y)) << 8)
/* some handy short aliases to avoid exessively long lines */
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#define CFX_INT CLUTTER_FIXED_INT
#define CFX_MUL CLUTTER_FIXED_MUL
#define CFX_DIV CLUTTER_FIXED_DIV
/* Fixed point math routines */
extern inline
ClutterFixed clutter_qmulx (ClutterFixed op1, ClutterFixed op2);
ClutterFixed clutter_sinx (ClutterFixed angle);
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ClutterFixed clutter_sini (ClutterAngle angle);
ClutterFixed clutter_tani (ClutterAngle angle);
/* convenience macros for the cos functions */
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/**
* clutter_cosx:
* @angle: a #ClutterFixed angle in radians
*
* Fixed point cosine function
*
* Return value: #ClutterFixed cosine value.
*
* Note: Implemneted as a macro.
*
* Since: 0.2
*/
#define clutter_cosx(angle) clutter_fixed_sin((angle) + CFX_PI_2)
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/**
* clutter_cosi:
* @angle: a #ClutterAngle angle
*
* Very fast fixed point implementation of cosine function.
*
* ClutterAngle is an integer such that 1024 represents
* full circle.
*
* Return value: #ClutterFixed cosine value.
*
* Note: Implemneted as a macro.
*
* Since: 0.2
*/
#define clutter_cosi(angle) clutter_sini((angle) + 256)
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ClutterFixed clutter_sqrtx (ClutterFixed x);
gint clutter_sqrti (gint x);
ClutterFixed clutter_log2x (guint x);
guint clutter_pow2x (ClutterFixed x);
guint clutter_powx (guint x, ClutterFixed y);
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/* <private> */
extern inline
ClutterFixed _clutter_double_to_fixed (double value);
extern inline
gint _clutter_double_to_int (double value);
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G_END_DECLS
#endif