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