random_utils.cpp

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Author : Stuart Morgan
Date : 2019-08-14 12:25:12
Hash : 9d737966
Message : Standardize copyright notices to project style For all "ANGLE Project" copyrights, standardize to the format specified by the style guide. Changes: - "Copyright (c)" and "Copyright(c)" changed to just "Copyright". - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1"). - Fixed a small number of files that had no copyright date using the initial commit year from the version control history. - Fixed one instance of copyright being "The ANGLE Project" rather than "The ANGLE Project Authors" These changes are applied both to the copyright of source file, and where applicable to copyright statements that are generated by templates. BUG=angleproject:3811 Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

util/random_utils.cpp

//
// Copyright 2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// random_utils:
//   Helper functions for random number generation.
//

#include "random_utils.h"

#include <chrono>

#include <cstdlib>

namespace angle
{

// Seed from clock
RNG::RNG()
{
    long long timeSeed = std::chrono::system_clock::now().time_since_epoch().count();
    mGenerator.seed(static_cast<unsigned int>(timeSeed));
}

// Seed from fixed number.
RNG::RNG(unsigned int seed) : mGenerator(seed) {}

RNG::~RNG() {}

void RNG::reseed(unsigned int newSeed)
{
    mGenerator.seed(newSeed);
}

bool RNG::randomBool(float probTrue)
{
    std::bernoulli_distribution dist(probTrue);
    return dist(mGenerator);
}

int RNG::randomInt()
{
    std::uniform_int_distribution<int> intDistribution;
    return intDistribution(mGenerator);
}

int RNG::randomIntBetween(int min, int max)
{
    std::uniform_int_distribution<int> intDistribution(min, max);
    return intDistribution(mGenerator);
}

unsigned int RNG::randomUInt()
{
    std::uniform_int_distribution<unsigned int> uintDistribution;
    return uintDistribution(mGenerator);
}

float RNG::randomFloat()
{
    std::uniform_real_distribution<float> floatDistribution;
    return floatDistribution(mGenerator);
}

float RNG::randomFloatBetween(float min, float max)
{
    std::uniform_real_distribution<float> floatDistribution(min, max);
    return floatDistribution(mGenerator);
}

float RNG::randomFloatNonnegative()
{
    std::uniform_real_distribution<float> floatDistribution(0.0f,
                                                            std::numeric_limits<float>::max());
    return floatDistribution(mGenerator);
}

float RNG::randomNegativeOneToOne()
{
    return randomFloatBetween(-1.0f, 1.0f);
}

}  // namespace angle

kc3-lang/angle/util/random_utils.cpp

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kc3-lang/angle /util/random_utils.cpp