////  RandomAndNoise.h////  Created by Olivier Prat on 05/16/18.//  Copyright 2018 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html//#ifndef RANDOM_AND_NOISE_H#define RANDOM_AND_NOISE_H #include <glm/vec2.hpp> namespace halton {    // Low discrepancy Halton sequence generator    template <int B>    float evaluate(int index) {        float f = 1.0f;        float r = 0.0f;        float invB = 1.0f / (float)B;        index++; // Indices start at 1, not 0         while (index > 0) {            f = f * invB;            r = r + f * (float)(index % B);            index = index / B;         }         return r;    }} inline float getRadicalInverseVdC(uint32_t bits) {    bits = (bits << 16u) | (bits >> 16u);    bits = ((bits & 0x55555555u) << 1u) | ((bits & 0xAAAAAAAAu) >> 1u);    bits = ((bits & 0x33333333u) << 2u) | ((bits & 0xCCCCCCCCu) >> 2u);    bits = ((bits & 0x0F0F0F0Fu) << 4u) | ((bits & 0xF0F0F0F0u) >> 4u);    bits = ((bits & 0x00FF00FFu) << 8u) | ((bits & 0xFF00FF00u) >> 8u);    return float(bits) * 2.3283064365386963e-10f; // / 0x100000000\n"} namespace hammersley {    // Low discrepancy Hammersley 2D sequence generator    inline glm::vec2 evaluate(int k, const int sequenceLength) {        return glm::vec2(float(k) / float(sequenceLength), getRadicalInverseVdC(k));    }}  #endif