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111 lines
2.4 KiB
C++
111 lines
2.4 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*/
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/*
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* Based on OPL emulation code of DOSBox
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* Copyright (C) 2002-2009 The DOSBox Team
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* Licensed under GPLv2+
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* http://www.dosbox.com
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*/
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#ifndef SOUND_SOFTSYNTH_OPL_DOSBOX_H
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#define SOUND_SOFTSYNTH_OPL_DOSBOX_H
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#ifndef DISABLE_DOSBOX_OPL
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#include "sound/fmopl.h"
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namespace OPL {
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namespace DOSBox {
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struct Timer {
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double startTime;
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double delay;
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bool enabled, overflow, masked;
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uint8 counter;
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Timer();
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//Call update before making any further changes
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void update(double time);
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//On a reset make sure the start is in sync with the next cycle
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void reset(double time);
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void stop();
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void start(double time, int scale);
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};
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struct Chip {
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//Last selected register
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Timer timer[2];
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//Check for it being a write to the timer
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bool write(uint32 addr, uint8 val);
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//Read the current timer state, will use current double
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uint8 read();
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};
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namespace DBOPL {
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struct Chip;
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} // end of namespace DBOPL
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class OPL : public ::OPL::OPL {
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private:
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Config::OplType _type;
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uint _rate;
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DBOPL::Chip *_emulator;
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Chip _chip[2];
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union {
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uint16 normal;
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uint8 dual[2];
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} _reg;
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void free();
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void dualWrite(uint8 index, uint8 reg, uint8 val);
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public:
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OPL(Config::OplType type);
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~OPL();
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bool init(int rate);
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void reset();
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void write(int a, int v);
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byte read(int a);
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void writeReg(int r, int v);
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void readBuffer(int16 *buffer, int length);
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bool isStereo() const { return _type != Config::kOpl2; }
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};
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} // End of namespace DOSBox
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} // End of namespace OPL
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#endif // !DISABLE_DOSBOX_OPL
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#endif
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