kc3-lang/angle/util/random_utils.cpp

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• Hash : f83cbc65
  Author :
  Date : 2016-01-22T15:27:21
  

  Use std::random functions for test and samples RNG.
  
  These standard functions are much more powerful than the C random()
  routines. Use them to improve the random utils, and use a class
  to clean things up further.
  
  This fixes a problem I was having using random_utils where I was
  having trouble generating random 32 bit unsigned integers.
  
  BUG=angleproject:1290
  
  Change-Id: I5081764053d0667a4e323553b7dea531256aa778
  Reviewed-on: https://chromium-review.googlesource.com/323440
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Tryjob-Request: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Tested-by: Jamie Madill <jmadill@chromium.org>
  

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• util/random_utils.cpp

• //
  // Copyright (c) 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);
  }
  
  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::randomNegativeOneToOne()
  {
      return randomFloatBetween(-1.0f, 1.0f);
  }
  
  }  // namespace angle
  

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