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102 lines
2.4 KiB
C
102 lines
2.4 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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#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 fl2ir(fl) ((int)(fl + ((fl < 0.0f) ? -0.5f : 0.5f)))
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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_radians(fl) ((float)((fl * PI)/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)/PI))
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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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// sees if two floating point numbers are within the minimum tolerance
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inline bool fl_equal(float a, float b)
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{
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return fl_abs(a - b) <= FLT_EPSILON * MAX(1.0f, MAX(fl_abs(a), fl_abs(b)));
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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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