339 lines
6.7 KiB
C++
339 lines
6.7 KiB
C++
/*************************************************************************/
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/* math_funcs.cpp */
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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) 2007-2017 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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#include "math_funcs.h"
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#include "core/os/os.h"
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#include "float.h"
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#include <math.h>
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uint32_t Math::default_seed = 1;
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#define PHI 0x9e3779b9
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#if 0
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static uint32_t Q[4096];
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#endif
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uint32_t Math::rand_from_seed(uint32_t *seed) {
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#if 1
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uint32_t k;
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uint32_t s = (*seed);
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if (s == 0)
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s = 0x12345987;
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k = s / 127773;
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s = 16807 * (s - k * 127773) - 2836 * k;
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// if (s < 0)
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// s += 2147483647;
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(*seed) = s;
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return (s & Math::RANDOM_MAX);
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#else
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*seed = *seed * 1103515245 + 12345;
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return (*seed % ((unsigned int)RANDOM_MAX + 1));
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#endif
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}
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void Math::seed(uint32_t x) {
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#if 0
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int i;
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Q[0] = x;
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Q[1] = x + PHI;
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Q[2] = x + PHI + PHI;
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for (i = 3; i < 4096; i++)
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Q[i] = Q[i - 3] ^ Q[i - 2] ^ PHI ^ i;
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#else
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default_seed = x;
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#endif
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}
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void Math::randomize() {
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OS::Time time = OS::get_singleton()->get_time();
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seed(OS::get_singleton()->get_ticks_usec() * (time.hour + 1) * (time.min + 1) * (time.sec + 1) * rand()); /* *OS::get_singleton()->get_time().sec); // windows doesn't have get_time(), returns always 0 */
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}
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uint32_t Math::rand() {
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return rand_from_seed(&default_seed) & 0x7FFFFFFF;
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}
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double Math::randf() {
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return (double)rand() / (double)RANDOM_MAX;
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}
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double Math::sin(double p_x) {
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return ::sin(p_x);
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}
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double Math::cos(double p_x) {
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return ::cos(p_x);
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}
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double Math::tan(double p_x) {
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return ::tan(p_x);
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}
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double Math::sinh(double p_x) {
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return ::sinh(p_x);
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}
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double Math::cosh(double p_x) {
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return ::cosh(p_x);
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}
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double Math::tanh(double p_x) {
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return ::tanh(p_x);
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}
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double Math::deg2rad(double p_y) {
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return p_y * Math_PI / 180.0;
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}
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double Math::rad2deg(double p_y) {
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return p_y * 180.0 / Math_PI;
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}
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double Math::round(double p_val) {
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if (p_val >= 0) {
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return ::floor(p_val + 0.5);
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} else {
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p_val = -p_val;
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return -::floor(p_val + 0.5);
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}
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}
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double Math::asin(double p_x) {
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return ::asin(p_x);
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}
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double Math::acos(double p_x) {
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return ::acos(p_x);
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}
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double Math::atan(double p_x) {
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return ::atan(p_x);
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}
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double Math::dectime(double p_value, double p_amount, double p_step) {
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float sgn = p_value < 0 ? -1.0 : 1.0;
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float val = absf(p_value);
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val -= p_amount * p_step;
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if (val < 0.0)
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val = 0.0;
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return val * sgn;
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}
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double Math::atan2(double p_y, double p_x) {
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return ::atan2(p_y, p_x);
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}
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double Math::sqrt(double p_x) {
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return ::sqrt(p_x);
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}
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double Math::fmod(double p_x, double p_y) {
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return ::fmod(p_x, p_y);
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}
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double Math::fposmod(double p_x, double p_y) {
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if (p_x >= 0) {
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return Math::fmod(p_x, p_y);
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} else {
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return p_y - Math::fmod(-p_x, p_y);
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}
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}
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double Math::floor(double p_x) {
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return ::floor(p_x);
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}
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double Math::ceil(double p_x) {
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return ::ceil(p_x);
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}
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int Math::step_decimals(double p_step) {
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static const int maxn = 9;
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static const double sd[maxn] = {
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0.9999, // somehow compensate for floating point error
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0.09999,
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0.009999,
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0.0009999,
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0.00009999,
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0.000009999,
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0.0000009999,
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0.00000009999,
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0.000000009999
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};
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double as = absf(p_step);
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for (int i = 0; i < maxn; i++) {
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if (as >= sd[i]) {
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return i;
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}
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}
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return maxn;
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}
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double Math::ease(double p_x, double p_c) {
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if (p_x < 0)
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p_x = 0;
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else if (p_x > 1.0)
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p_x = 1.0;
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if (p_c > 0) {
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if (p_c < 1.0) {
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return 1.0 - Math::pow(1.0 - p_x, 1.0 / p_c);
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} else {
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return Math::pow(p_x, p_c);
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}
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} else if (p_c < 0) {
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//inout ease
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if (p_x < 0.5) {
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return Math::pow(p_x * 2.0, -p_c) * 0.5;
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} else {
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return (1.0 - Math::pow(1.0 - (p_x - 0.5) * 2.0, -p_c)) * 0.5 + 0.5;
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}
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} else
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return 0; // no ease (raw)
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}
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double Math::stepify(double p_value, double p_step) {
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if (p_step != 0) {
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p_value = floor(p_value / p_step + 0.5) * p_step;
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}
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return p_value;
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}
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bool Math::is_nan(double p_val) {
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return (p_val != p_val);
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}
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bool Math::is_inf(double p_val) {
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#ifdef _MSC_VER
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return !_finite(p_val);
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#else
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return isinf(p_val);
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#endif
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}
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uint32_t Math::larger_prime(uint32_t p_val) {
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static const uint32_t primes[] = {
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5,
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13,
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23,
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47,
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97,
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193,
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389,
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769,
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1543,
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3079,
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6151,
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12289,
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24593,
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49157,
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98317,
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196613,
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393241,
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786433,
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1572869,
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3145739,
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6291469,
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12582917,
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25165843,
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50331653,
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100663319,
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201326611,
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402653189,
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805306457,
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1610612741,
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0,
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};
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int idx = 0;
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while (true) {
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ERR_FAIL_COND_V(primes[idx] == 0, 0);
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if (primes[idx] > p_val)
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return primes[idx];
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idx++;
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}
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return 0;
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}
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double Math::random(double from, double to) {
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unsigned int r = Math::rand();
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double ret = (double)r / (double)RANDOM_MAX;
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return (ret) * (to - from) + from;
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}
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double Math::pow(double x, double y) {
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return ::pow(x, y);
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}
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double Math::log(double x) {
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return ::log(x);
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}
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double Math::exp(double x) {
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return ::exp(x);
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}
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