diff options
Diffstat (limited to 'core/math/random_pcg.h')
| -rw-r--r-- | core/math/random_pcg.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/core/math/random_pcg.h b/core/math/random_pcg.h new file mode 100644 index 0000000000..4a43c36ede --- /dev/null +++ b/core/math/random_pcg.h @@ -0,0 +1,61 @@ +/*************************************************************************/ +/* random_pcg.h */ +/*************************************************************************/ +/* 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. */ +/*************************************************************************/ + +#ifndef RANDOM_PCG_H +#define RANDOM_PCG_H + +#include "core/math/math_defs.h" + +#include "thirdparty/misc/pcg.h" + +class RandomPCG { + pcg32_random_t pcg; + +public: + static const uint64_t DEFAULT_SEED = 12047754176567800795ULL; + static const uint64_t DEFAULT_INC = PCG_DEFAULT_INC_64; + static const uint64_t RANDOM_MAX = 4294967295; + + RandomPCG(uint64_t seed = DEFAULT_SEED, uint64_t inc = PCG_DEFAULT_INC_64); + + _FORCE_INLINE_ void seed(uint64_t seed) { pcg.state = seed; } + _FORCE_INLINE_ uint64_t get_seed() { return pcg.state; } + + void randomize(); + _FORCE_INLINE_ uint32_t rand() { return pcg32_random_r(&pcg); } + _FORCE_INLINE_ double randf() { return (double)rand() / (double)RANDOM_MAX; } + _FORCE_INLINE_ float randd() { return (float)rand() / (float)RANDOM_MAX; } + + double random(double from, double to); + float random(float from, float to); + real_t random(int from, int to) { return (real_t)random((real_t)from, (real_t)to); } +}; + +#endif // RANDOM_PCG_H |