kc3-lang/angle/util/random_utils.cpp

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• Author : Jiacheng Lu
  Date : 2019-07-19 09:18:55
  Hash : f35f1110
  Message : Add script to apply clang-format on all sources 1. python script wrapper to call clang-format over the whole code base 2. Add clang-format rule `IncludeBlocks: Preserve` to tell clang-format do not merge include blocks 3. Fix existed clang-format issue in code base Bug: angleproject:3532 Change-Id: I289292dc62c2784ff21688065c87c3f3f5538f17 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1709720 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>

• 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);
  }
  
  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