120 lines
2.4 KiB
C++
120 lines
2.4 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#pragma once
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#include <algorithm>
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#include <vector>
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#include "Common/CommonTypes.h"
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#ifdef _MSC_VER
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#include <intrin.h>
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#endif
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namespace MathUtil
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{
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constexpr double TAU = 6.2831853071795865;
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constexpr double PI = TAU / 2;
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template <typename T>
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constexpr auto Sign(const T& val) -> decltype((T{} < val) - (val < T{}))
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{
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return (T{} < val) - (val < T{});
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}
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template <typename T, typename F>
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constexpr auto Lerp(const T& x, const T& y, const F& a) -> decltype(x + (y - x) * a)
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{
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return x + (y - x) * a;
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}
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template <typename T>
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constexpr bool IsPow2(T imm)
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{
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return imm > 0 && (imm & (imm - 1)) == 0;
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}
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constexpr u32 NextPowerOf2(u32 value)
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{
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--value;
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value |= value >> 1;
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value |= value >> 2;
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value |= value >> 4;
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value |= value >> 8;
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value |= value >> 16;
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++value;
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return value;
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}
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template <class T>
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struct Rectangle
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{
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T left{};
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T top{};
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T right{};
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T bottom{};
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constexpr Rectangle() = default;
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constexpr Rectangle(T theLeft, T theTop, T theRight, T theBottom)
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: left(theLeft), top(theTop), right(theRight), bottom(theBottom)
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{
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}
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constexpr bool operator==(const Rectangle& r) const
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{
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return left == r.left && top == r.top && right == r.right && bottom == r.bottom;
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}
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T GetWidth() const { return abs(right - left); }
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T GetHeight() const { return abs(bottom - top); }
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// If the rectangle is in a coordinate system with a lower-left origin, use
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// this Clamp.
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void ClampLL(T x1, T y1, T x2, T y2)
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{
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left = std::clamp(left, x1, x2);
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right = std::clamp(right, x1, x2);
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top = std::clamp(top, y2, y1);
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bottom = std::clamp(bottom, y2, y1);
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}
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// If the rectangle is in a coordinate system with an upper-left origin,
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// use this Clamp.
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void ClampUL(T x1, T y1, T x2, T y2)
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{
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left = std::clamp(left, x1, x2);
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right = std::clamp(right, x1, x2);
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top = std::clamp(top, y1, y2);
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bottom = std::clamp(bottom, y1, y2);
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}
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};
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} // namespace MathUtil
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float MathFloatVectorSum(const std::vector<float>&);
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// Rounds down. 0 -> undefined
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inline int IntLog2(u64 val)
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{
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#if defined(__GNUC__)
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return 63 - __builtin_clzll(val);
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#elif defined(_MSC_VER)
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unsigned long result = ULONG_MAX;
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_BitScanReverse64(&result, val);
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return result;
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#else
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int result = -1;
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while (val != 0)
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{
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val >>= 1;
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++result;
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}
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return result;
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#endif
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}
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