9bd77e25b2
* clutter/clutter-feature.h: * clutter/clutter-feature.c: Move the GL headers from the header file to the body. * clutter/clutter-fixed.h: * clutter/clutter-fixed.c: Fix apidoc. * clutter/clutter-color.h: * clutter/clutter-color.c: Ditto.
100 lines
3 KiB
C
100 lines
3 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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*
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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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typedef gint32 ClutterFixed;
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typedef gint32 ClutterAngle; /* angle such that 1024 == 2*PI */
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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_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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#define CFX_PI 0x0003243f
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#define CFX_2PI 0x0006487f
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#define CFX_PI_2 0x00019220 /* pi/2 */
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#define CFX_PI_4 0x0000c910 /* pi/4 */
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#define CFX_PI8192 0x6487ed51 /* pi * 0x2000, to improve precision */
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#define CFX_360 CLUTTER_INT_TO_FIXED (360)
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#define CFX_240 CLUTTER_INT_TO_FIXED (240)
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#define CFX_180 CLUTTER_INT_TO_FIXED (180)
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#define CFX_120 CLUTTER_INT_TO_FIXED (120)
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#define CFX_60 CLUTTER_INT_TO_FIXED (60)
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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) \
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( (ABS(x) > 32767.0) ? \
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(((x)/(x))*0x7fffffff) \
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: ((long)((x) * 65536.0 + ((x) < 0 ? -0.5 : 0.5))) )
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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) \
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(((x) >= 0) ? ((x) >> CFX_Q) : ~((~(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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ClutterFixed clutter_sinx (ClutterFixed angle);
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ClutterFixed clutter_sini (ClutterAngle angle);
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/* convenience macros for the cos functions */
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#define clutter_cosx(x) clutter_fixed_sin((x) - CFX_PI_2)
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#define clutter_cosi(x) clutter_sini((x) - 256)
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ClutterFixed clutter_sqrtx (ClutterFixed x);
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gint clutter_sqrti (gint x);
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G_END_DECLS
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#endif
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