mirror of
https://github.com/brl/mutter.git
synced 2024-11-22 08:00:42 -05:00
199 lines
4.6 KiB
C
199 lines
4.6 KiB
C
/*
|
|
* Clutter.
|
|
*
|
|
* An OpenGL based 'interactive canvas' library.
|
|
*
|
|
* Authored By Matthew Allum <mallum@openedhand.com>
|
|
* 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
|
|
|
|
/**
|
|
* ClutterFixed:
|
|
*
|
|
* Fixed point number (16.16)
|
|
*/
|
|
typedef gint32 ClutterFixed;
|
|
|
|
/**
|
|
* ClutterAngle:
|
|
*
|
|
* Integer representation of an angle such that 1024 corresponds to
|
|
* full circle (i.e., 2*Pi).
|
|
*/
|
|
typedef gint32 ClutterAngle; /* angle such that 1024 == 2*PI */
|
|
|
|
#define CFX_Q 16 /* Decimal part size in bits */
|
|
#define CFX_ONE (1 << CFX_Q) /* 1 */
|
|
#define CFX_MAX 0x7fffffff
|
|
#define CFX_MIN 0x80000000
|
|
|
|
/*
|
|
* some commonly used constants
|
|
*/
|
|
|
|
/**
|
|
* CFX_PI:
|
|
*
|
|
* Fixed point representation of Pi
|
|
*/
|
|
#define CFX_PI 0x0003243f
|
|
/**
|
|
* CFX_2PI:
|
|
*
|
|
* Fixed point representation of Pi*2
|
|
*/
|
|
#define CFX_2PI 0x0006487f
|
|
/**
|
|
* CFX_PI2:
|
|
*
|
|
* Fixed point representation of Pi/2
|
|
*/
|
|
#define CFX_PI_2 0x00019220 /* pi/2 */
|
|
/**
|
|
* CFX_PI4:
|
|
*
|
|
* Fixed point representation of Pi/4
|
|
*/
|
|
#define CFX_PI_4 0x0000c910 /* pi/4 */
|
|
/**
|
|
* CFX_360:
|
|
*
|
|
* Fixed point representation of the number 360
|
|
*/
|
|
#define CFX_360 CLUTTER_INT_TO_FIXED (360)
|
|
/**
|
|
* CFX_240:
|
|
*
|
|
* Fixed point representation of the number 240
|
|
*/
|
|
#define CFX_240 CLUTTER_INT_TO_FIXED (240)
|
|
/**
|
|
* CFX_180:
|
|
*
|
|
* Fixed point representation of the number 180
|
|
*/
|
|
#define CFX_180 CLUTTER_INT_TO_FIXED (180)
|
|
/**
|
|
* CFX_120:
|
|
*
|
|
* Fixed point representation of the number 120
|
|
*/
|
|
#define CFX_120 CLUTTER_INT_TO_FIXED (120)
|
|
/**
|
|
* CFX_60:
|
|
*
|
|
* Fixed point representation of the number 60
|
|
*/
|
|
#define CFX_60 CLUTTER_INT_TO_FIXED (60)
|
|
/**
|
|
* CFX_255:
|
|
*
|
|
* Fixed point representation of the number 255
|
|
*/
|
|
#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))
|
|
|
|
#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 */
|
|
|
|
#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);
|
|
ClutterFixed clutter_sini (ClutterAngle angle);
|
|
|
|
ClutterFixed clutter_tani (ClutterAngle angle);
|
|
|
|
/* convenience macros for the cos functions */
|
|
|
|
/**
|
|
* 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)
|
|
|
|
/**
|
|
* 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)
|
|
|
|
ClutterFixed clutter_sqrtx (ClutterFixed x);
|
|
gint clutter_sqrti (gint x);
|
|
|
|
|
|
/* <private> */
|
|
extern inline
|
|
ClutterFixed _clutter_double_to_fixed (double value);
|
|
|
|
extern inline
|
|
ClutterFixed _clutter_double_to_int (double value);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif
|