206 lines
5.2 KiB
C
206 lines
5.2 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, 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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#ifndef _HAVE_CLUTTER_FIXED_H
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#define _HAVE_CLUTTER_FIXED_H
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#include <glib.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 gint32 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 gint32 ClutterAngle; /* angle such that 1024 == 2*PI */
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#define CLUTTER_ANGLE_FROM_DEG(x) (CLUTTER_FLOAT_TO_INT ((x * 1024.0) / 360.0))
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#define CLUTTER_ANGLE_FROM_DEGF(x) (CLUTTER_FLOAT_TO_INT (((float)x * 1024.0f) / 360.0f))
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#define CLUTTER_ANGLE_TO_DEGF(x) (((float)x * 360.0)/ 1024.0)
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#define CLUTTER_ANGLE_FROM_DEGX(x) (CFX_INT(((x/360)*1024) + CFX_HALF))
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#define CFX_Q 16 /* Decimal part size in bits */
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#define CFX_ONE (1 << CFX_Q) /* 1 */
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#define CFX_HALF 32768
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#define CFX_MAX 0x7fffffff
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#define CFX_MIN 0x80000000
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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_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 0x0003243f
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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 0x0006487f
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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 0x00019220 /* 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 0x0000c910 /* 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 CLUTTER_INT_TO_FIXED (360)
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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 CLUTTER_INT_TO_FIXED (240)
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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 CLUTTER_INT_TO_FIXED (180)
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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 CLUTTER_INT_TO_FIXED (120)
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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 CLUTTER_INT_TO_FIXED (60)
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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 CLUTTER_INT_TO_FIXED (255)
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#define CLUTTER_FIXED_TO_FLOAT(x) ((float) ((int)(x) / 65536.0))
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#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)))
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#define CLUTTER_FLOAT_TO_INT(x) (_clutter_double_to_int ((x)))
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#define CLUTTER_INT_TO_FIXED(x) ((x) << CFX_Q)
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#define CLUTTER_FIXED_INT(x) ((x) >> CFX_Q)
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#define CLUTTER_FIXED_FRACTION(x) ((x) & ((1 << CFX_Q) - 1))
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#define CLUTTER_FIXED_FLOOR(x) (((x) >= 0) ? ((x) >> CFX_Q) \
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: ~((~(x)) >> CFX_Q))
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#define CLUTTER_FIXED_CEIL(x) (CLUTTER_FIXED_FLOOR (x + 0xffff))
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#define CLUTTER_FIXED_MUL(x,y) ((x) >> 8) * ((y) >> 8)
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#define CLUTTER_FIXED_DIV(x,y) ((((x) << 8)/(y)) << 8)
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/* some handy short aliases to avoid exessively long lines */
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#define CFX_INT CLUTTER_FIXED_INT
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#define CFX_MUL CLUTTER_FIXED_MUL
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#define CFX_DIV CLUTTER_FIXED_DIV
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/* Fixed point math routines */
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extern inline
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ClutterFixed clutter_qmulx (ClutterFixed op1, ClutterFixed op2);
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ClutterFixed clutter_sinx (ClutterFixed angle);
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ClutterFixed clutter_sini (ClutterAngle angle);
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ClutterFixed clutter_tani (ClutterAngle angle);
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/* convenience macros for the cos functions */
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/**
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* clutter_cosx:
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* @angle: a #ClutterFixed angle in radians
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*
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* Fixed point cosine function
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*
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* Return value: #ClutterFixed cosine value.
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*
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* Note: Implemneted as a macro.
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*
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* Since: 0.2
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*/
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#define clutter_cosx(angle) (clutter_fixed_sin((angle) + CFX_PI_2))
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/**
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* clutter_cosi:
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* @angle: a #ClutterAngle angle
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*
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* Very fast fixed point implementation of cosine function.
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*
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* ClutterAngle is an integer such that 1024 represents
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* full circle.
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*
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* Return value: #ClutterFixed cosine value.
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*
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* Note: Implemneted as a macro.
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*
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* Since: 0.2
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*/
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#define clutter_cosi(angle) (clutter_sini ((angle) + 256))
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ClutterFixed clutter_sqrtx (ClutterFixed x);
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gint clutter_sqrti (gint x);
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ClutterFixed clutter_log2x (guint x);
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guint clutter_pow2x (ClutterFixed x);
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guint clutter_powx (guint x, ClutterFixed y);
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/* <private> */
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extern inline
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ClutterFixed _clutter_double_to_fixed (double value);
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extern inline
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gint _clutter_double_to_int (double value);
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G_END_DECLS
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#endif /* _HAVE_CLUTTER_FIXED_H */
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