kc3-lang/angle/util/random_utils.h

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• Author : Jamie Madill
  Date : 2016-01-22 15:27:21
  Hash : f83cbc65
  Message : 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>

• util/random_utils.h

• //
  // 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.
  //
  
  #ifndef UTIL_RANDOM_UTILS_H
  #define UTIL_RANDOM_UTILS_H
  
  // TODO(jmadill): Rework this if Chromium decides to ban <random>
  #include <random>
  
  namespace angle
  {
  
  class RNG
  {
    public:
      // Seed from clock
      RNG();
      // Seed from fixed number.
      RNG(unsigned int seed);
      ~RNG();
  
      void reseed(unsigned int newSeed);
  
      int randomInt();
      int randomIntBetween(int min, int max);
      unsigned int randomUInt();
      float randomFloat();
      float randomFloatBetween(float min, float max);
      float randomNegativeOneToOne();
  
    private:
      std::default_random_engine mGenerator;
  };
  
  }  // namespace angle
  
  #endif // UTIL_RANDOM_UTILS_H