From ca3293e0332bbd9fe63d6cd6bc215f048132bd08 Mon Sep 17 00:00:00 2001 From: John Mark Bell Date: Sat, 14 Feb 2009 19:24:40 +0000 Subject: Make fpmath stuff public. Un-inline string->fixed conversion routine. svn path=/trunk/libcss/; revision=6513 --- include/libcss/fpmath.h | 61 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 include/libcss/fpmath.h (limited to 'include/libcss/fpmath.h') diff --git a/include/libcss/fpmath.h b/include/libcss/fpmath.h new file mode 100644 index 0000000..0e314cb --- /dev/null +++ b/include/libcss/fpmath.h @@ -0,0 +1,61 @@ +/* + * This file is part of LibCSS. + * Licensed under the MIT License, + * http://www.opensource.org/licenses/mit-license.php + * Copyright 2008 John-Mark Bell + */ + +#ifndef libcss_fpmath_h_ +#define libcss_fpmath_h_ + +#include + +/* 22:10 fixed point math */ +typedef int32_t css_fixed; + +/* Add two fixed point values */ +#define FADD(a, b) ((a) + (b)) +/* Subtract two fixed point values */ +#define FSUB(a, b) ((a) - (b)) +/* Multiply two fixed point values */ +#define FMUL(a, b) (((a) * (b)) >> 10) +/* Divide two fixed point values */ +#define FDIV(a, b) (((a) << 10) / (b)) + +/* Add an integer to a fixed point value */ +#define FADDI(a, b) ((a) + ((b) << 10)) +/* Subtract an integer from a fixed point value */ +#define FSUBI(a, b) ((a) - ((b) << 10)) +/* Multiply a fixed point value by an integer */ +#define FMULI(a, b) ((a) * (b)) +/* Divide a fixed point value by an integer */ +#define FDIVI(a, b) ((a) / (b)) + +/* Convert a floating point value to fixed point */ +#define FLTTOFIX(a) ((fixed) ((a) * (float) (1 << 10))) +/* Convert a fixed point value to floating point */ +#define FIXTOFLT(a) ((float) (a) / (float) (1 << 10)) + +/* Convert an integer to a fixed point value */ +#define INTTOFIX(a) ((a) << 10) +/* Convert a fixed point value to an integer */ +#define FIXTOINT(a) ((a) >> 10) + +/* Useful values */ +#define F_PI_2 0x00000648 /* 1.5708 (PI/2) */ +#define F_PI 0x00000c91 /* 3.1415 (PI) */ +#define F_3PI_2 0x000012d9 /* 4.7124 (3PI/2) */ +#define F_2PI 0x00001922 /* 6.2831 (2 PI) */ + +#define F_90 0x00016800 /* 90 */ +#define F_180 0x0002d000 /* 180 */ +#define F_270 0x00043800 /* 270 */ +#define F_360 0x0005a000 /* 360 */ + +#define F_100 0x00019000 /* 100 */ +#define F_200 0x00032000 /* 200 */ +#define F_300 0x0004b000 /* 300 */ +#define F_400 0x00064000 /* 400 */ + +#endif + -- cgit v1.2.3