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52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
// Copyright 2013 Dolphin Emulator Project / 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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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 <cstddef>
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#include <cstdlib>
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#include <type_traits>
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namespace MathUtil
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{
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inline bool IntervalsIntersect(unsigned start0, unsigned length0, unsigned start1, unsigned length1) {
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return (std::max(start0, start1) < std::min(start0 + length0, start1 + length1));
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}
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template<typename T>
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inline T Clamp(const T val, const T& min, const T& max) {
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return std::max(min, std::min(max, val));
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}
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/// Sign-extends a val of type T that has NBits bits.
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template<size_t NBits, typename T>
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inline T SignExtend(const T val) {
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static_assert(std::numeric_limits<T>::is_signed, "T must be signed");
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static_assert(NBits <= 8 * sizeof(T), "NBits larger that bitsize of T");
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using unsignedT = typename std::make_unsigned<T>::type;
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constexpr size_t shift = 8 * sizeof(T) - NBits;
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return static_cast<T>(static_cast<unsignedT>(val) << shift) >> shift;
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}
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template<class T>
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struct Rectangle {
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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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Rectangle() {}
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Rectangle(T left, T top, T right, T bottom) : left(left), top(top), right(right), bottom(bottom) {}
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T GetWidth() const { return std::abs(static_cast<typename std::make_signed<T>::type>(right - left)); }
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T GetHeight() const { return std::abs(static_cast<typename std::make_signed<T>::type>(bottom - top)); }
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};
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} // namespace MathUtil
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