60 lines
1.5 KiB
Plaintext
60 lines
1.5 KiB
Plaintext
/*
|
|
* This file is part of libsidplayfp, a SID player engine.
|
|
*
|
|
* Copyright 2012-2014 Leandro Nini <drfiemost@users.sourceforge.net>
|
|
* Copyright 2010 Antti Lankila
|
|
*
|
|
* This program 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 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef NULLSID_H
|
|
#define NULLSID_H
|
|
|
|
#include "c64/c64sid.h"
|
|
|
|
#include "sidcxx11.h"
|
|
|
|
namespace libsidplayfp
|
|
{
|
|
|
|
/**
|
|
* SID chip placeholder which does nothing and returns 0xff on reading.
|
|
*/
|
|
class NullSid : public c64sid
|
|
{
|
|
private:
|
|
NullSid() {}
|
|
virtual ~NullSid() {}
|
|
|
|
public:
|
|
/**
|
|
* Returns singleton instance.
|
|
*/
|
|
static NullSid *getInstance()
|
|
{
|
|
static NullSid nullsid;
|
|
return &nullsid;
|
|
}
|
|
|
|
void reset(uint8_t) override {}
|
|
|
|
void write(uint_least8_t, uint8_t) override {}
|
|
uint8_t read(uint_least8_t) override { return 0xff; }
|
|
};
|
|
|
|
}
|
|
|
|
#endif // NULLSID_H
|