random_utils.cpp

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Author : Lingfeng Yang
Date : 2018-05-17 22:36:52
Hash : d0febe7a
Message : 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>

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

kc3-lang/angle/util/random_utils.cpp

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kc3-lang/angle /util/random_utils.cpp