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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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.
*
* $URL$
* $Id$
*
*/
#include "sci/sfx/sci_midi.h"
#include "sound/fmopl.h"
namespace Sci {
class MidiDriver_Adlib : public MidiDriver_Emulated {
public:
enum {
kVoices = 9,
kRhythmKeys = 62
};
MidiDriver_Adlib(Audio::Mixer *mixer) : MidiDriver_Emulated(mixer), _playSwitch(true), _masterVolume(15), _rhythmKeyMap(0), _opl(0) { }
~MidiDriver_Adlib() { }
// MidiDriver
int open(bool isSCI0);
void close();
void send(uint32 b);
MidiChannel *allocateChannel() { return NULL; }
MidiChannel *getPercussionChannel() { return NULL; }
// AudioStream
bool isStereo() const { return _stereo; }
int getRate() const { return _mixer->getOutputRate(); }
// MidiDriver_Emulated
void generateSamples(int16 *buf, int len);
void setVolume(byte volume);
void playSwitch(bool play);
void loadResource(Resource *res);
private:
enum ChannelID {
kLeftChannel = 1,
kRightChannel = 2
};
struct AdlibOperator {
bool amplitudeMod;
bool vibrato;
bool envelopeType;
bool kbScaleRate;
byte frequencyMult; // (0-15)
byte kbScaleLevel; // (0-3)
byte totalLevel; // (0-63, 0=max, 63=min)
byte attackRate; // (0-15)
byte decayRate; // (0-15)
byte sustainLevel; // (0-15)
byte releaseRate; // (0-15)
byte waveForm; // (0-3)
};
struct AdlibModulator {
byte feedback; // (0-7)
bool algorithm;
};
struct AdlibPatch {
AdlibOperator op[2];
AdlibModulator mod;
};
struct Channel {
uint8 patch; // Patch setting
uint8 volume; // Channel volume (0-63)
uint8 pan; // Pan setting (0-127, 64 is center)
uint8 holdPedal; // Hold pedal setting (0 to 63 is off, 127 to 64 is on)
uint8 extraVoices; // The number of additional voices this channel optimally needs
uint16 pitchWheel; // Pitch wheel setting (0-16383, 8192 is center)
uint8 lastVoice; // Last voice used for this MIDI channel
bool enableVelocity; // Enable velocity control (SCI0)
Channel() : patch(0), volume(63), pan(64), holdPedal(0), extraVoices(0),
pitchWheel(8192), lastVoice(0), enableVelocity(false) { }
};
struct AdlibVoice {
int8 channel; // MIDI channel that this voice is assigned to or -1
int8 note; // Currently playing MIDI note or -1
int patch; // Currently playing patch or -1
uint8 velocity; // Note velocity
bool isSustained; // Flag indicating a note that is being sustained by the hold pedal
uint16 age; // Age of the current note
AdlibVoice() : channel(-1), note(-1), patch(-1), velocity(0), isSustained(false), age(0) { }
};
bool _stereo;
bool _isSCI0;
OPL::OPL *_opl;
bool _playSwitch;
int _masterVolume;
Channel _channels[MIDI_CHANNELS];
AdlibVoice _voices[kVoices];
byte *_rhythmKeyMap;
Common::Array<AdlibPatch> _patches;
void loadInstrument(const byte *ins);
void voiceOn(int voice, int note, int velocity);
void voiceOff(int voice);
void setPatch(int voice, int patch);
void setNote(int voice, int note, bool key);
void setVelocity(int voice);
void setOperator(int oper, AdlibOperator &op);
void setRegister(int reg, int value, int channels = kLeftChannel | kRightChannel);
void renewNotes(int channel, bool key);
void noteOn(int channel, int note, int velocity);
void noteOff(int channel, int note);
int findVoice(int channel);
void voiceMapping(int channel, int voices);
void assignVoices(int channel, int voices);
void releaseVoices(int channel, int voices);
void donateVoices();
int findVoiceBasic(int channel);
void setVelocityReg(int regOffset, int velocity, int kbScaleLevel, int pan);
int calcVelocity(int voice, int op);
};
class MidiPlayer_Adlib : public MidiPlayer {
public:
MidiPlayer_Adlib() { _driver = new MidiDriver_Adlib(g_system->getMixer()); }
int open(ResourceManager *resMan);
int getPlayMask() const { return 0x04; }
int getPolyphony() const { return MidiDriver_Adlib::kVoices; }
bool hasRhythmChannel() const { return false; }
void setVolume(byte volume) { static_cast<MidiDriver_Adlib *>(_driver)->setVolume(volume); }
void playSwitch(bool play) { static_cast<MidiDriver_Adlib *>(_driver)->playSwitch(play); }
void loadInstrument(int idx, byte *data);
};
} // End of namespace Sci
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