scalar.h revision 1d77b719d51a01cbd6954a048fb64e79d50a950e 
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