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https://github.com/mpv-player/mpv.git
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52e7269ea6
Add xoshiro as a PRNG implementation instead of relying on srand() and rand() from the C standard library. This, in particular, lets us avoid platform-defined behavior with respect to threading.
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/*
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* Implementation of non-cryptographic pseudo-random number
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* generator algorithm known as xoshiro.
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*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stdint.h>
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/*
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* Initialize the pseudo-random number generator's state with
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* the given 64-bit seed.
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*/
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void mp_rand_seed(uint64_t seed);
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/*
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* Return the next 64-bit psuedo-random integer, and update the state
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* accordingly.
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*/
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uint64_t mp_rand_next(void);
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/*
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* Return a double value in the range of [0.0, 1.0) with uniform
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* distribution, and update the state accordingly.
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*/
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double mp_rand_next_double(void);
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