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https://github.com/scp-fs2open/fs2open.github.com.git
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169 lines
4.6 KiB
C
169 lines
4.6 KiB
C
/*
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* Copyright (C) Volition, Inc. 1999. All rights reserved.
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*
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* All source code herein is the property of Volition, Inc. You may not sell
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* or otherwise commercially exploit the source or things you created based on the
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* source.
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*
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*/
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/*
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* $Logfile: /Freespace2/code/Math/Floating.h $
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* $Revision: 2.5.2.1 $
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* $Date: 2006-06-18 16:54:36 $
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* $Author: taylor $
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*
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* Low-level floating point math macros and routines
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*
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* $Log: not supported by cvs2svn $
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* Revision 2.5 2006/04/20 06:32:07 Goober5000
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* proper capitalization according to Volition
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*
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* Revision 2.4 2005/12/28 22:30:24 taylor
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* add fl_tan() for getting the tangent of a float since it's terribly inaccurate to just use tan() on a float
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*
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* Revision 2.3 2005/07/13 03:15:50 Goober5000
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* remove PreProcDefine #includes in FS2
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* --Goober5000
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*
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* Revision 2.2 2005/03/24 23:36:13 taylor
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* fix compiler warnings with mismatched types and unused variables
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* cleanup some debug messages so they can be turned off if needed
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* get rid of extra strstr() check for thrusters since it should never get that far anyway
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* page_in/page_out of model glows should be better now
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* removed a bunch of unneeded casts and get type specific math functions right
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*
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* Revision 2.1 2004/08/11 05:06:27 Kazan
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* added preprocdefines.h to prevent what happened with fred -- make sure to make all fred2 headers include this file as the _first_ include -- i have already modified fs2 files to do this
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*
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* Revision 2.0 2002/06/03 04:02:24 penguin
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* Warpcore CVS sync
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*
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* Revision 1.1 2002/05/02 18:03:09 mharris
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* Initial checkin - converted filenames and includes to lower case
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*
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*
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* 4 4/07/99 6:22p Dave
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* Fred and FreeSpace support for multiple background bitmaps and suns.
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* Fixed link errors on all subprojects. Moved encrypt_init() to
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* cfile_init() and lcl_init(), since its safe to call twice.
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*
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* 3 11/05/98 4:18p Dave
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* First run nebula support. Beefed up localization a bit. Removed all
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* conditional compiles for foreign versions. Modified mission file
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* format.
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*
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* 2 10/07/98 10:53a Dave
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* Initial checkin.
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*
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* 1 10/07/98 10:49a Dave
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*
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* 13 2/26/98 3:28p John
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* Changed all sqrt's to use fl_sqrt. Took out isqrt function
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*
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* 12 1/26/98 10:43p Mike
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* Make ships not all zoom away from an impending shockwave at the same
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* time. Based on ai class and randomness
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*
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* 11 1/17/98 3:32p Mike
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* Add rand_range(), returns random float in min..max.
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*
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* 10 7/29/97 2:36p Hoffoss
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* Added header file required by _isnan().
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*
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* 9 7/29/97 2:35p Hoffoss
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* Added a NaN check macro.
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*
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* 8 2/17/97 5:18p John
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* Added a bunch of RCS headers to a bunch of old files that don't have
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* them.
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*
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* $NoKeywords: $
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*/
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#ifndef _FLOATING_H
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#define _FLOATING_H
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#include <math.h>
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#include <float.h>
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extern float frand();
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extern int rand_chance(float frametime, float chance = 1.0f);
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float frand_range(float min, float max);
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// determine if a floating point number is NaN (Not a Number)
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#define fl_is_nan(fl) _isnan((double)(fl))
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// Handy macros to prevent type casting all over the place
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#define fl_sqrt(fl) sqrtf(fl)
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#define fl_isqrt(fl) (1.0f/sqrtf(fl))
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#define fl_abs(fl) fabsf(fl)
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#define i2fl(i) ((float)(i))
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#define fl2i(fl) ((int)(fl))
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#define flceil(fl) (int)ceil(fl)
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#define flfloor(fl) (int)floor(fl)
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#define f2fl(fx) ((float)(fx)/65536.0f)
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#define fl2f(fl) (int)((fl)*65536.0f)
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#define fl_tan(fl) tanf(fl)
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// convert a measurement in degrees to radians
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#define fl_radian(fl) ((float)((fl * 3.14159f)/180.0f))
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// convert a measurement in radians to degrees
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#define fl_degrees(fl) ((float)((fl * 180.0f)/3.14159))
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// use this instead of:
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// for: (int)floor(x+0.5f) use fl_round_2048(x)
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// (int)ceil(x-0.5f) use fl_round_2048(x)
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// (int)floor(x-0.5f) use fl_round_2048(x-1.0f)
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// (int)floor(x) use fl_round_2048(x-0.5f)
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// for values in the range -2048 to 2048
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// use this instead of:
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// for: (int)floor(x+0.5f) use fl_round_2048(x)
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// (int)ceil(x-0.5f) use fl_round_2048(x)
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// (int)floor(x-0.5f) use fl_round_2048(x-1.0f)
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// (int)floor(x) use fl_round_2048(x-0.5f)
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// for values in the range -2048 to 2048
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/*
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extern const float *p_fl_magic;
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inline int fl_round_2048( float x )
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{
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double tmp_quad;
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tmp_quad = x + *p_fl_magic;
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return *((int *)&tmp_quad);
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}
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inline float fl_sqrt( float x)
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{
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float retval;
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_asm fld x
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_asm fsqrt
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_asm fstp retval
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return retval;
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}
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float fl_isqrt( float x )
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{
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float retval;
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_asm fld x
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_asm fsqrt
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_asm fstp retval
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return 1.0f / retval;
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}
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*/
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// rounds off a floating point number to a multiple of some number
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extern float fl_roundoff(float x, int multiple);
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#endif
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