kc3-lang/angle/util/random_utils.cpp

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• Hash : d0febe7a
  Author :
  Date : 2018-05-17T22:36:52
  

  Reland "GLES1: Entry points for lighting and materials"
  
  This is a reland of 4a09c1a245c406e402b3996b7ed33798b897e60f
  
  Entry points have been autogenerated again.
  
  Original change's description:
  > GLES1: Entry points for lighting and materials
  >
  > - glLight*/glMaterial and their queries
  > - Use new packed enums in these entry points, except for lightmodel
  > which stays GLenum to be consistent with other generic glGet's
  > - State.cpp: New glGet* queries related to light model and
  > light/normal rescale enablement
  > - GLES1State.cpp: Functions to get/set lighting/material state
  > - Validation for lighting/materials
  >
  > + Add a few convenience methods to random_utils for sampling
  > non-negative floats and a sampler for random booleans
  >
  > BUG=angleproject:2306
  >
  > Change-Id: If7ba0c0a0dc75f88fbaa986b904f1ea96ee6512e
  > Reviewed-on: https://chromium-review.googlesource.com/1065502
  > Commit-Queue: Lingfeng Yang <lfy@google.com>
  > Reviewed-by: Geoff Lang <geofflang@chromium.org>
  
  Bug: angleproject:2306
  Change-Id: I434273acd5200dd9f4925e239a032cc8db31a434
  Reviewed-on: https://chromium-review.googlesource.com/1072849
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Commit-Queue: Lingfeng Yang <lfy@google.com>
  

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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);
  }
  
  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
  

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