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//-----------------------------------------------------------------------------
// Name: rand.cpp
// Developer: Wolfire Games LLC
// Author: Max Danielsson
// Description: This is a threadsafe variant of pcg rand(), which doesn't
// require a local reseed variable.
// License: Read below
//-----------------------------------------------------------------------------
//
// Copyright 2022 Wolfire Games LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//-----------------------------------------------------------------------------
#include "rand.h"
#include <Utility/pcg_basic.h>
#include <Internal/integer.h>
#include <cstdlib>
#include <mutex>
static std::mutex mutex;
static unsigned int reseed;
static pcg32_random_t seedr;
void rand_ts_seed(unsigned int seed)
{
mutex.lock();
pcg32_srandom_r(&seedr,seed,seed);
mutex.unlock();
}
uint32_t rand_ts()
{
uint32_t v;
mutex.lock();
v = pcg32_random_r(&seedr);
mutex.unlock();
return v;
}
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