94 lines
1.8 KiB
C++
94 lines
1.8 KiB
C++
/*
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Copyright 2016-2017 StapleButter
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This file is part of melonDS.
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melonDS is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with melonDS. If not, see http://www.gnu.org/licenses/.
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*/
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#ifndef FIFO_H
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#define FIFO_H
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#include "types.h"
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template<typename T>
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class FIFO
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{
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public:
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FIFO(u32 num)
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{
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NumEntries = num;
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Entries = new T[num];
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Clear();
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}
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~FIFO()
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{
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delete[] Entries;
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}
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void Clear()
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{
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NumOccupied = 0;
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ReadPos = 0;
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WritePos = 0;
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memset(&Entries[ReadPos], 0, sizeof(T));
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}
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void Write(T val)
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{
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if (IsFull()) return;
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Entries[WritePos] = val;
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WritePos++;
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if (WritePos >= NumEntries)
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WritePos = 0;
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NumOccupied++;
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}
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T Read()
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{
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T ret = Entries[ReadPos];
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if (IsEmpty())
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return ret;
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ReadPos++;
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if (ReadPos >= NumEntries)
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ReadPos = 0;
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NumOccupied--;
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return ret;
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}
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T Peek()
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{
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return Entries[ReadPos];
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}
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u32 Level() { return NumOccupied; }
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bool IsEmpty() { return NumOccupied == 0; }
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bool IsFull() { return NumOccupied >= NumEntries; }
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private:
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u32 NumEntries;
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T* Entries;
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u32 NumOccupied;
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u32 ReadPos, WritePos;
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};
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#endif
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