99 lines
3.2 KiB
C++
99 lines
3.2 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 AGOS_DRIVERS_ACCOLADE_CMS_H
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#define AGOS_DRIVERS_ACCOLADE_CMS_H
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#include "audio/mididrv.h"
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#include "audio/cms.h"
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namespace AGOS {
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// MIDI driver for the Creative Music System / Gameblaster.
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// This driver uses only 6 of the available 12 channels and does not support
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// stereo. It only supports note on and off and program change; the selected
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// instrument only affects the note volume.
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class MidiDriver_Accolade_Cms : public MidiDriver {
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protected:
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static const byte REGISTER_BASE_AMPLITUDE = 0x00;
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static const byte REGISTER_BASE_FREQUENCY = 0x08;
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static const byte REGISTER_BASE_OCTAVE = 0x10;
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static const byte REGISTER_FREQUENCY_ENABLE = 0x14;
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static const byte REGISTER_RESET_SOUND_ENABLE = 0x1C;
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// Frequency register values for octave notes.
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static const byte CMS_NOTE_FREQUENCIES[12];
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// Volume adjustments for all instruments.
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static const byte CMS_VOLUME_ADJUSTMENTS[128];
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public:
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MidiDriver_Accolade_Cms();
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~MidiDriver_Accolade_Cms() override;
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int open() override;
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void close() override;
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bool isOpen() const override;
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uint32 getBaseTempo() override;
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// This driver does not support MidiChannel objects.
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MidiChannel *allocateChannel() override;
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// This driver does not support MidiChannel objects.
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MidiChannel *getPercussionChannel() override;
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using MidiDriver::send;
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void send(uint32 b) override;
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void setTimerCallback(void *timer_param, Common::TimerManager::TimerProc timer_proc) override;
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void onTimer();
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protected:
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void cmsInit();
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void noteOff(uint8 channel, uint8 note);
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void noteOn(uint8 channel, uint8 note, uint8 velocity);
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void programChange(uint8 channel, uint8 instrument);
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void controlChange(uint8 channel, uint8 controller, uint8 value);
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// Returns the value for the frequency enable register of the first CMS
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// chip based on the _activeNotes array (if a note is active, the bit for
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// the corresponding channel is set).
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byte determineFrequencyEnableRegisterValue();
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void writeRegister(uint16 reg, uint8 value);
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CMS::CMS *_cms;
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bool _isOpen;
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// The selected instrument on each MIDI channel.
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byte _instruments[16];
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// The active note on each CMS channel (0xFF if no note is active).
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byte _activeNotes[12];
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// The current values of the CMS octave registers (0x10 - 0x12).
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byte _octaveRegisterValues[6];
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// External timer callback
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void *_timer_param;
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Common::TimerManager::TimerProc _timer_proc;
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};
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} // End of namespace AGOS
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#endif
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