79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
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/*
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* PCG Random Number Generation for C.
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*
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* Copyright 2014 Melissa O'Neill <oneill@pcg-random.org>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* For additional information about the PCG random number generation scheme,
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* including its license and other licensing options, visit
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*
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* http://www.pcg-random.org
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*/
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/*
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* This code is derived from the full C implementation, which is in turn
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* derived from the canonical C++ PCG implementation. The C++ version
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* has many additional features and is preferable if you can use C++ in
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* your project.
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*/
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#ifndef PCG_BASIC_H_INCLUDED
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#define PCG_BASIC_H_INCLUDED 1
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#include <inttypes.h>
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#if __cplusplus
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extern "C" {
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#endif
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struct pcg_state_setseq_64 { // Internals are *Private*.
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uint64_t state; // RNG state. All values are possible.
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uint64_t inc; // Controls which RNG sequence (stream) is
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// selected. Must *always* be odd.
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};
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typedef struct pcg_state_setseq_64 pcg32_random_t;
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// If you *must* statically initialize it, here's one.
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#define PCG32_INITIALIZER { 0x853c49e6748fea9bULL, 0xda3e39cb94b95bdbULL }
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// pcg32_srandom(initstate, initseq)
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// pcg32_srandom_r(rng, initstate, initseq):
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// Seed the rng. Specified in two parts, state initializer and a
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// sequence selection constant (a.k.a. stream id)
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void pcg32_srandom(uint64_t initstate, uint64_t initseq);
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void pcg32_srandom_r(pcg32_random_t* rng, uint64_t initstate,
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uint64_t initseq);
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// pcg32_random()
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// pcg32_random_r(rng)
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// Generate a uniformly distributed 32-bit random number
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uint32_t pcg32_random(void);
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uint32_t pcg32_random_r(pcg32_random_t* rng);
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// pcg32_boundedrand(bound):
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// pcg32_boundedrand_r(rng, bound):
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// Generate a uniformly distributed number, r, where 0 <= r < bound
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uint32_t pcg32_boundedrand(uint32_t bound);
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uint32_t pcg32_boundedrand_r(pcg32_random_t* rng, uint32_t bound);
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#if __cplusplus
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}
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#endif
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#endif // PCG_BASIC_H_INCLUDED
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