1/* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#pragma once 18 19#include <algorithm> 20#include <cmath> 21 22namespace android { 23 24template<typename T> 25static constexpr T saturate(T v) noexcept { 26 return T(std::min(T(1), std::max(T(0), v))); 27} 28 29template<typename T> 30static constexpr T clamp(T v, T min, T max) noexcept { 31 return T(std::min(max, std::max(min, v))); 32} 33 34template<typename T> 35static constexpr T mix(T x, T y, T a) noexcept { 36 return x * (T(1) - a) + y * a; 37} 38 39template<typename T> 40static constexpr T lerp(T x, T y, T a) noexcept { 41 return mix(x, y, a); 42} 43 44} // namespace std 45