85 lines
1.8 KiB
C++
85 lines
1.8 KiB
C++
//
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// Copyright 2014 The ANGLE Project Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// random_utils:
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// Helper functions for random number generation.
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//
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#include "random_utils.h"
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#include <chrono>
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#include <cstdlib>
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namespace angle
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{
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// Seed from clock
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RNG::RNG()
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{
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long long timeSeed = std::chrono::system_clock::now().time_since_epoch().count();
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mGenerator.seed(static_cast<unsigned int>(timeSeed));
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}
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// Seed from fixed number.
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RNG::RNG(unsigned int seed) : mGenerator(seed) {}
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RNG::~RNG() {}
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void RNG::reseed(unsigned int newSeed)
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{
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mGenerator.seed(newSeed);
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}
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bool RNG::randomBool(float probTrue)
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{
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std::bernoulli_distribution dist(probTrue);
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return dist(mGenerator);
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}
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int RNG::randomInt()
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{
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std::uniform_int_distribution<int> intDistribution;
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return intDistribution(mGenerator);
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}
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int RNG::randomIntBetween(int min, int max)
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{
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std::uniform_int_distribution<int> intDistribution(min, max);
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return intDistribution(mGenerator);
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}
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unsigned int RNG::randomUInt()
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{
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std::uniform_int_distribution<unsigned int> uintDistribution;
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return uintDistribution(mGenerator);
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}
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float RNG::randomFloat()
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{
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std::uniform_real_distribution<float> floatDistribution;
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return floatDistribution(mGenerator);
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}
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float RNG::randomFloatBetween(float min, float max)
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{
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std::uniform_real_distribution<float> floatDistribution(min, max);
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return floatDistribution(mGenerator);
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}
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float RNG::randomFloatNonnegative()
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{
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std::uniform_real_distribution<float> floatDistribution(0.0f,
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std::numeric_limits<float>::max());
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return floatDistribution(mGenerator);
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}
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float RNG::randomNegativeOneToOne()
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{
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return randomFloatBetween(-1.0f, 1.0f);
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}
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} // namespace angle
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