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Goober5000
d23e4b8e87
Change the casts used in the convenience #defines in floating.h. Since these #defines are used pretty widely, this should reduce the count of C-style casts in the codebase by quite a bit. Also change the casts in floating.cpp while we're at it, and remove some obsolete or unused code.
80 lines
2.5 KiB
C++
80 lines
2.5 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 <cmath>
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#include <cfloat>
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#include <limits>
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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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inline bool fl_is_nan(float fl) {
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return std::isnan(fl);
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}
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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) (static_cast<float>(i))
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#define fl2i(fl) (static_cast<int>(fl))
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#define fl2ir(fl) (static_cast<int>(fl + (((fl) < 0.0f) ? -0.5f : 0.5f)))
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#define f2fl(fx) (static_cast<float>(fx)/65536.0f)
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#define f2d(fx) (static_cast<double>(fx)/65536.0)
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#define fl2f(fl) (static_cast<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) (static_cast<float>((fl) * (PI / 180.0f)))
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// convert a measurement in radians to degrees
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#define fl_degrees(fl) (static_cast<float>((fl) * (180.0f / PI)))
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// sees if a floating point number is within a certain threshold (by default, epsilon) of zero
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inline bool fl_near_zero(float a, float e = std::numeric_limits<float>::epsilon())
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{
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return a < e && a > -e;
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}
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// sees if two floating point numbers are approximately equal, taking into account the argument magnitudes
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// see commit c62037
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// and see also this article, because fl_equal may need to be rewritten if it is recruited into more demanding situations:
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// https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/
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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 * std::max({ 1.0f, fl_abs(a), fl_abs(b) });
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}
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// sees if two floating point numbers are approximately equal, with a user-specifiable epsilon
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inline bool fl_equal(float a, float b, float epsilon)
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{
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return fl_abs(a - b) <= epsilon;
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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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const float GOLDEN_RATIO = 0.618033989f;
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float golden_ratio_rand();
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// clamps the input to -1, 1 to avoid floating point error putting it outside that range
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float acosf_safe(float x);
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float asinf_safe(float x);
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#endif
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