185 lines
5.4 KiB
C++
185 lines
5.4 KiB
C++
/*************************************************************************/
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/* math_funcs.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2015 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef MATH_FUNCS_H
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#define MATH_FUNCS_H
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#include "typedefs.h"
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#include "math_defs.h"
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#ifndef NO_MATH_H
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#include "math.h"
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#endif
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class Math {
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static uint32_t default_seed;
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public:
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Math() {}; // useless to instance
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enum {
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RANDOM_MAX=2147483647L
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};
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static double sin(double p_x);
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static double cos(double p_x);
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static double tan(double p_x);
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static double sinh(double p_x);
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static double cosh(double p_x);
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static double tanh(double p_x);
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static double asin(double p_x);
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static double acos(double p_x);
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static double atan(double p_x);
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static double atan2(double p_y, double p_x);
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static double deg2rad(double p_y);
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static double rad2deg(double p_y);
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static double sqrt(double p_x);
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static double fmod(double p_x,double p_y);
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static double fposmod(double p_x,double p_y);
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static uint32_t rand_from_seed(uint32_t *seed);
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static double floor(double p_x);
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static double ceil(double p_x);
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static double ease(double p_x, double p_c);
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static int decimals(double p_step);
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static double stepify(double p_value,double p_step);
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static void seed(uint32_t x=0);
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static void randomize();
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static uint32_t larger_prime(uint32_t p_val);
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static double dectime(double p_value,double p_amount, double p_step);
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static inline double linear2db(double p_linear) {
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return Math::log( p_linear ) * 8.6858896380650365530225783783321;
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}
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static inline double db2linear(double p_linear) {
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return Math::exp( p_linear * 0.11512925464970228420089957273422 );
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}
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static bool is_nan(double p_val);
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static bool is_inf(double p_val);
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static uint32_t rand();
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static double randf();
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static double round(double p_val);
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static double random(double from, double to);
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static _FORCE_INLINE_ real_t abs(real_t g) {
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#ifdef REAL_T_IS_DOUBLE
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return absd(g);
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#else
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return absf(g);
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#endif
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}
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static _FORCE_INLINE_ float absf(float g) {
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union {
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float f;
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uint32_t i;
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} u;
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u.f=g;
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u.i&=2147483647u;
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return u.f;
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}
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static _FORCE_INLINE_ double absd(double g) {
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union {
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double d;
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uint64_t i;
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} u;
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u.d=g;
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u.i&=(uint64_t)9223372036854775807ll;
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return u.d;
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}
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//this function should be as fast as possible and rounding mode should not matter
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static _FORCE_INLINE_ int fast_ftoi(float a) {
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static int b;
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#if (defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0603) || WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP // windows 8 phone?
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b = (int)((a>0.0f) ? (a + 0.5f):(a -0.5f));
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#elif defined(_MSC_VER) && _MSC_VER < 1800
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__asm fld a
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__asm fistp b
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/*#elif defined( __GNUC__ ) && ( defined( __i386__ ) || defined( __x86_64__ ) )
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// use AT&T inline assembly style, document that
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// we use memory as output (=m) and input (m)
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__asm__ __volatile__ (
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"flds %1 \n\t"
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"fistpl %0 \n\t"
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: "=m" (b)
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: "m" (a));*/
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#else
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b=lrintf(a); //assuming everything but msvc 2012 or earlier has lrint
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#endif
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return b;
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}
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#if defined(__GNUC__)
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static _FORCE_INLINE_ int64_t dtoll(double p_double) { return (int64_t)p_double; } ///@TODO OPTIMIZE
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#else
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static _FORCE_INLINE_ int64_t dtoll(double p_double) { return (int64_t)p_double; } ///@TODO OPTIMIZE
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#endif
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static _FORCE_INLINE_ float lerp(float a, float b, float c) {
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return a+(b-a)*c;
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}
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static double pow(double x, double y);
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static double log(double x);
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static double exp(double x);
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};
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#define Math_PI 3.14159265358979323846
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#define Math_SQRT12 0.7071067811865475244008443621048490
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#endif // MATH_FUNCS_H
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