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65 lines
2.3 KiB
C++
65 lines
2.3 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 DARKSEED_ADLIB_WORX_H
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#define DARKSEED_ADLIB_WORX_H
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#include "audio/adlib_ms.h"
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namespace Darkseed {
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/**
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* Implementation of the AdLib code from the Worx Toolkit library,
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* based on version 2.1, as used by Dark Seed (CD version).
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* Implements the OPL channel allocation algorithm and note frequency
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* and volume calculation.
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*
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* TODO Implementation is incomplete, because Dark Seed does not use
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* some functionality of the library:
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* - OPL rhythm mode
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* - Transpose controllers 0x68 and 0x69 (seems to be buggy)
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*/
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class MidiDriver_Worx_AdLib : public MidiDriver_ADLIB_Multisource {
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private:
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/**
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* The OPL instrument bank of the Worx Toolkit.
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* This was taken from the Dark Seed executable and might have been
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* customized for the game.
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*/
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static const AdLibIbkInstrumentDefinition WORX_INSTRUMENT_BANK[];
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/**
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* The OPL frequency (F-num) for each octave note.
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*/
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static const uint16 OPL_NOTE_FREQUENCIES[];
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public:
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MidiDriver_Worx_AdLib(OPL::Config::OplType oplType, int timerFrequency = OPL::OPL::kDefaultCallbackFrequency);
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~MidiDriver_Worx_AdLib();
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protected:
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uint8 allocateOplChannel(uint8 channel, uint8 source, InstrumentInfo &instrumentInfo) override;
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uint16 calculateFrequency(uint8 channel, uint8 source, uint8 note) override;
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uint8 calculateUnscaledVolume(uint8 channel, uint8 source, uint8 velocity, const OplInstrumentDefinition &instrumentDef, uint8 operatorNum) override;
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};
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} // namespace Darkseed
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#endif // DARKSEED_ADLIB_WORX_H
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