GODOT IS OPEN SOURCE

1 files changed, 328 insertions, 0 deletions

diff --git a/core/math/math_funcs.cpp b/core/math/math_funcs.cpp
new file mode 100644
index 0000000000..2ba36e5a49
--- /dev/null
+++ b/core/math/math_funcs.cpp
@@ -0,0 +1,328 @@
+/*************************************************************************/
+/*  math_funcs.cpp                                                       */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                    http://www.godotengine.org                         */
+/*************************************************************************/
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                 */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+#include "math_funcs.h"
+
+#include "core/os/os.h"
+#include <math.h>
+#include "float.h"
+uint32_t Math::default_seed=1;
+
+
+#define PHI 0x9e3779b9
+
+static uint32_t Q[4096], c = 362436;
+
+
+uint32_t Math::rand_from_seed(uint32_t *seed) {
+
+#if 1
+	uint32_t k;
+	uint32_t s = (*seed);
+	if (s == 0)
+		s = 0x12345987;
+	k = s / 127773;
+	s = 16807 * (s - k * 127773) - 2836 * k;
+	if (s < 0)
+		s += 2147483647;
+	(*seed) = s;
+	return (s & Math::RANDOM_MAX);
+#else
+	*seed = *seed * 1103515245 + 12345;
+	return (*seed % ((unsigned int)RANDOM_MAX + 1));
+#endif
+}
+
+void Math::seed(uint32_t x) {
+#if 0
+	int i;
+
+	Q[0] = x;
+	Q[1] = x + PHI;
+	Q[2] = x + PHI + PHI;
+
+	for (i = 3; i < 4096; i++)
+		Q[i] = Q[i - 3] ^ Q[i - 2] ^ PHI ^ i;
+#else
+	default_seed=x;
+#endif
+}
+
+void Math::randomize() {
+
+	seed(OS::get_singleton()->get_ticks_usec()); /* *OS::get_singleton()->get_time().sec); // windows doesn't have get_time(), returns always 0 */
+}
+
+uint32_t Math::rand() {
+
+	return rand_from_seed(&default_seed)&0x7FFFFFFF;
+}
+
+double Math::randf() {
+
+	return (double)rand() / (double)RANDOM_MAX;
+}
+
+double Math::sin(double p_x) {
+
+	return ::sin(p_x);
+
+}
+
+double Math::cos(double p_x) {
+
+	return ::cos(p_x);
+
+}
+
+double Math::tan(double p_x) {
+
+	return ::tan(p_x);
+
+}
+double Math::sinh(double p_x) {
+
+	return ::sinh(p_x);
+}
+
+double Math::cosh(double p_x) {
+
+	return ::cosh(p_x);
+}
+
+double Math::tanh(double p_x) {
+
+	return ::tanh(p_x);
+}
+
+
+double Math::deg2rad(double p_y) {
+
+	return p_y*Math_PI/180.0;
+}
+
+double Math::rad2deg(double p_y) {
+
+	return p_y*180.0/Math_PI;
+}
+
+double Math::round(double p_val) {
+
+	if (p_val>0) {
+		return ::floor(p_val+0.5);
+	} else {
+		p_val=-p_val;
+		return -::floor(p_val+0.5);
+	}
+}
+double Math::asin(double p_x) {
+
+	return ::asin(p_x);
+
+}
+double Math::acos(double p_x) {
+
+	return ::acos(p_x);
+}
+
+double Math::atan(double p_x) {
+
+	return ::atan(p_x);
+}
+
+double Math::dectime(double p_value,double p_amount, double p_step) {
+
+	float sgn = p_value < 0 ? -1.0 : 1.0;
+	float val = absf(p_value);
+	val-=p_amount*p_step;
+	if (val<0.0)
+		val=0.0;
+	return val*sgn;
+}
+
+double Math::atan2(double p_y, double p_x) {
+
+	return ::atan2(p_y,p_x);
+
+}
+double Math::sqrt(double p_x) {
+
+	return ::sqrt(p_x);
+}
+
+double Math::fmod(double p_x,double p_y) {
+
+	return ::fmod(p_x,p_y);
+}
+
+double Math::fposmod(double p_x,double p_y) {
+
+	if (p_x>=0) {
+	
+		return Math::fmod(p_x,p_y);
+		
+	} else {
+	
+		return p_y-Math::fmod(-p_x,p_y); 
+	}
+
+}
+double Math::floor(double p_x) {
+
+	return ::floor(p_x);
+}
+
+double Math::ceil(double p_x) {
+
+	return ::ceil(p_x);
+}
+
+int Math::decimals(double p_step) {
+	
+	int max=4;
+	int i=0;
+	while( (p_step - Math::floor(p_step)) != 0.0 && max) {
+		
+		p_step*=10.0;
+		max--;
+		i++;
+	}
+	
+	return i;
+
+}
+
+double Math::ease(double p_x, double p_c) {
+
+	if (p_c>0) {
+
+		return Math::pow(p_x,p_c);
+	} else  if (p_c<0) {
+		//inout ease
+
+		if (p_x<0.5) {
+			return Math::pow(p_x*2.0,-p_c)*0.5;
+		} else {
+			return (1.0-Math::pow(1.0-(p_x-0.5)*2.0,-p_c))*0.5+0.5;
+		}
+	} else
+		return 0; // no ease (raw)
+
+}
+
+double Math::stepify(double p_value,double p_step) {
+	
+	if (p_step!=0) {
+		
+		p_value=floor( p_value / p_step + 0.5 ) * p_step;		
+	}	
+	return p_value;
+}
+
+bool Math::is_nan(double p_val) {
+
+	return (p_val!=p_val);
+}
+
+bool Math::is_inf(double p_val) {
+
+#ifdef _MSC_VER
+	return !_finite(p_val);
+#else
+	return isinf(p_val);
+#endif
+
+}
+
+uint32_t Math::larger_prime(uint32_t p_val) {
+
+	static const int primes[] = {
+		5,
+		13,
+		23,
+		47,
+		97,
+		193,
+		389,
+		769,
+		1543,
+		3079,
+		6151,
+		12289,
+		24593,
+		49157,
+		98317,
+		196613,
+		393241,
+		786433,
+		1572869,
+		3145739,
+		6291469,
+		12582917,
+		25165843,
+		50331653,
+		100663319,
+		201326611,
+		402653189,
+		805306457,
+		1610612741,
+		0,
+	};
+
+	int idx=0;
+	while (true) {
+
+		ERR_FAIL_COND_V(primes[idx]==0,0);
+		if (primes[idx]>p_val)
+			return primes[idx];
+		idx++;
+	}
+
+	return 0;
+}
+
+double Math::random(double from, double to) {
+
+	unsigned int r = Math::rand();
+	double ret = (double)r/(double)RANDOM_MAX;
+	return (ret)*(to-from) + from;
+}
+
+double Math::pow(double x, double y) {
+
+	return ::pow(x,y);
+}
+
+double Math::log(double x) {
+
+	return ::log(x);
+}
+double Math::exp(double x) {
+
+	return ::exp(x);
+}