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Implement random number generator

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Co-authored-by: Zirak <zirakertan@gmail.com>
This commit is contained in:
Chaosus
2018-09-21 14:32:17 +03:00
parent 8849d3b47d
commit f8151a9e50
8 changed files with 287 additions and 17 deletions
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55
core/math/random_pcg.cpp Normal file
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/*************************************************************************/
/* random_pcg.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* 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 "random_pcg.h"
#include "core/os/os.h"
RandomPCG::RandomPCG(uint64_t seed, uint64_t inc) :
pcg() {
pcg.state = seed;
pcg.inc = inc;
}
void RandomPCG::randomize() {
seed(OS::get_singleton()->get_ticks_usec() * pcg.state + PCG_DEFAULT_INC_64);
}
double RandomPCG::random(double from, double to) {
unsigned int r = rand();
double ret = (double)r / (double)RANDOM_MAX;
return (ret) * (to - from) + from;
}
float RandomPCG::random(float from, float to) {
unsigned int r = rand();
float ret = (float)r / (float)RANDOM_MAX;
return (ret) * (to - from) + from;
}