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Diffstat (limited to 'Source/Threading/rand.cpp')
-rw-r--r-- | Source/Threading/rand.cpp | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/Source/Threading/rand.cpp b/Source/Threading/rand.cpp new file mode 100644 index 00000000..593d89f1 --- /dev/null +++ b/Source/Threading/rand.cpp @@ -0,0 +1,51 @@ +//----------------------------------------------------------------------------- +// 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; +} |