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https://github.com/libretro/scummvm.git
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88 lines
2.2 KiB
C++
88 lines
2.2 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef AUDIO_CMS_H
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#define AUDIO_CMS_H
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#include "audio/chip.h"
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namespace CMS {
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class CMS;
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class Config {
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public:
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/**
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* Creates a CMS driver.
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*/
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static CMS *create();
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};
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class CMS : virtual public Audio::Chip {
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private:
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static bool _hasInstance;
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public:
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// The default number of timer callbacks per second.
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static const int DEFAULT_CALLBACK_FREQUENCY = 250;
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CMS();
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virtual ~CMS();
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/**
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* Initializes the CMS emulator.
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*
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* @return true on success, false on failure
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*/
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virtual bool init() = 0;
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/**
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* Reinitializes the CMS emulator
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*/
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virtual void reset() = 0;
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/**
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* Writes a byte to the given I/O port. CMS responds to 2 sets of 2 ports:
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* 0x220/0x222 - value for the 1st/2nd chip (channels 0-5/6-B)
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* 0x221/0x223 - register for the 1st/2nd chip
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*
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* @param a port address
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* @param v value, which will be written
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*/
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virtual void write(int a, int v) = 0;
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/**
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* Function to directly write to a specific CMS register. We allow writing
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* to secondary CMS chip registers by using register values >= 0x100.
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*
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* @param r hardware register number to write to
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* @param v value, which will be written
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*/
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virtual void writeReg(int r, int v) = 0;
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using Audio::Chip::start;
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void start(TimerCallback *callback) { start(callback, DEFAULT_CALLBACK_FREQUENCY); }
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};
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} // End of namespace CMS
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#endif
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