56 lines
2.7 KiB
C++
56 lines
2.7 KiB
C++
|
/*************************************************************************/
|
||
|
|
/* 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;
|
||
|
|
}
|