112 lines
2.2 KiB
C++
112 lines
2.2 KiB
C++
/******************************************************************************/
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/* Mednafen Sony PS1 Emulation Module */
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/******************************************************************************/
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/* FastFIFO.h:
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** Copyright (C) 2014-2016 Mednafen Team
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** as published by the Free Software Foundation; either version 2
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** of the License, or (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software Foundation, Inc.,
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** 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __MDFN_FASTFIFO_H
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#define __MDFN_FASTFIFO_H
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#include "emuware/EW_state.h"
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// size should be a power of 2.
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template<typename T, size_t size>
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class FastFIFO
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{
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public:
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FastFIFO()
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{
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memset(data, 0, sizeof(data));
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read_pos = 0;
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write_pos = 0;
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in_count = 0;
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}
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INLINE ~FastFIFO()
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{
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}
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INLINE void SaveStatePostLoad(void)
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{
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read_pos %= size;
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write_pos %= size;
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in_count %= (size + 1);
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}
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INLINE uint32 CanRead(void)
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{
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return(in_count);
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}
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INLINE uint32 CanWrite(void)
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{
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return(size - in_count);
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}
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INLINE T Peek(void)
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{
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return data[read_pos];
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}
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INLINE T Read(void)
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{
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T ret = data[read_pos];
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read_pos = (read_pos + 1) & (size - 1);
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in_count--;
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return(ret);
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}
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INLINE void Write(const T& wr_data)
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{
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data[write_pos] = wr_data;
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write_pos = (write_pos + 1) & (size - 1);
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in_count++;
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}
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INLINE void Flush(void)
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{
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read_pos = 0;
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write_pos = 0;
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in_count = 0;
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}
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T data[size];
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uint32 read_pos; // Read position
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uint32 write_pos; // Write position
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uint32 in_count; // Number of units in the FIFO
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template<bool isReader> void SyncState(EW::NewState *ns)
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{
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//I dont like this class...
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NSS(data);
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NSS(read_pos);
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NSS(write_pos);
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NSS(in_count);
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SaveStatePostLoad();
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}
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};
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#endif
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