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replacement of floating point ops with fixed point

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This commit is contained in:
Tomas Frydrych
2007-01-16 10:39:18 +00:00
parent 884cc0f5cf
commit 3b7a8c0c5c
6 changed files with 134 additions and 92 deletions
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15
clutter/clutter-fixed.h
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@ -37,12 +37,22 @@ typedef gint32 ClutterAngle; /* angle such that 1024 == 2*PI */
#define CFX_ONE (1 << CFX_Q) /* 1 */
#define CFX_MAX 0x7fffffff
#define CFX_MIN 0x80000000
/*
* some commonly used constants
*/
#define CFX_PI 0x0003243f
#define CFX_2PI 0x0006487f
#define CFX_PI_2 0x00019220 /* pi/2 */
#define CFX_PI_4 0x0000c910 /* pi/4 */
#define CFX_PI8192 0x6487ed51 /* pi * 0x2000, to improve precision */
#define CFX_360 CLUTTER_INT_TO_FIXED (360)
#define CFX_240 CLUTTER_INT_TO_FIXED (240)
#define CFX_180 CLUTTER_INT_TO_FIXED (180)
#define CFX_120 CLUTTER_INT_TO_FIXED (120)
#define CFX_60 CLUTTER_INT_TO_FIXED (60)
#define CLUTTER_FIXED_TO_FLOAT(x) ((float)((int)(x)/65536.0))
#define CLUTTER_FIXED_TO_DOUBLE(x) ((double)((int)(x)/65536.0))
@ -68,6 +78,11 @@ typedef gint32 ClutterAngle; /* angle such that 1024 == 2*PI */
#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 */
ClutterFixed clutter_fixed_sin (ClutterFixed anx);
ClutterFixed clutter_angle_sin (ClutterAngle angle);