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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.
*/
#ifndef SCUMM_IMUSE_PCSPK_H
#define SCUMM_IMUSE_PCSPK_H
#include "audio/softsynth/emumidi.h"
#include "audio/softsynth/pcspk.h"
namespace Scumm {
class PcSpkDriver : public MidiDriver_Emulated {
public:
PcSpkDriver(Audio::Mixer *mixer);
~PcSpkDriver();
virtual int open();
virtual void close();
virtual void send(uint32 d);
virtual void sysEx_customInstrument(byte channel, uint32 type, const byte *instr);
virtual MidiChannel *allocateChannel();
virtual MidiChannel *getPercussionChannel() { return 0; }
bool isStereo() const { return _pcSpk.isStereo(); }
int getRate() const { return _pcSpk.getRate(); }
protected:
void generateSamples(int16 *buf, int len);
void onTimer();
private:
Audio::PCSpeaker _pcSpk;
int _effectTimer;
uint8 _randBase;
void updateNote();
void output(uint16 out);
static uint8 getEffectModifier(uint16 level);
int16 getEffectModLevel(int16 level, int8 mod);
int16 getRandScale(int16 input);
struct EffectEnvelope {
uint8 state;
int16 currentLevel;
int16 duration;
int16 maxLevel;
int16 startLevel;
uint8 loop;
uint8 stateTargetLevels[4];
uint8 stateModWheelLevels[4];
uint8 modWheelSensitivity;
uint8 modWheelState;
uint8 modWheelLast;
int16 stateNumSteps;
int16 stateStepCounter;
int16 changePerStep;
int8 dir;
int16 changePerStepRem;
int16 changeCountRem;
};
struct EffectDefinition {
int16 phase;
uint8 type;
uint8 useModWheel;
EffectEnvelope *envelope;
};
struct OutputChannel {
uint8 active;
uint8 note;
uint8 sustainNoteOff;
uint8 length;
const uint8 *instrument;
uint8 unkA;
uint8 unkB;
uint8 unkC;
int16 unkE;
EffectEnvelope effectEnvelopeA;
EffectDefinition effectDefA;
EffectEnvelope effectEnvelopeB;
EffectDefinition effectDefB;
int16 unk60;
};
struct MidiChannel_PcSpk : public MidiChannel {
virtual MidiDriver *device();
virtual byte getNumber();
virtual void release();
virtual void send(uint32 b);
virtual void noteOff(byte note);
virtual void noteOn(byte note, byte velocity);
virtual void programChange(byte program);
virtual void pitchBend(int16 bend);
virtual void controlChange(byte control, byte value);
virtual void pitchBendFactor(byte value);
virtual void priority(byte value);
virtual void sysEx_customInstrument(uint32 type, const byte *instr);
void init(PcSpkDriver *owner, byte channel);
bool allocate();
PcSpkDriver *_owner;
bool _allocated;
byte _channel;
OutputChannel _out;
uint8 _instrument[23];
uint8 _programNr;
uint8 _priority;
uint8 _tl;
uint8 _modWheel;
uint8 _sustain;
uint8 _pitchBendFactor;
int16 _pitchBend;
};
void setupEffects(MidiChannel_PcSpk &chan, EffectEnvelope &env, EffectDefinition &def, byte flags, const byte *data);
void startEffect(EffectEnvelope &env, const byte *data);
void initNextEnvelopeState(EffectEnvelope &env);
void updateEffectGenerator(MidiChannel_PcSpk &chan, EffectEnvelope &env, EffectDefinition &def);
uint8 advanceEffectEnvelope(EffectEnvelope &env, EffectDefinition &def);
MidiChannel_PcSpk _channels[6];
MidiChannel_PcSpk *_activeChannel;
MidiChannel_PcSpk *_lastActiveChannel;
uint16 _lastActiveOut;
static const byte _outInstrumentData[1024];
static const byte _outputTable1[];
static const byte _outputTable2[];
static const uint16 _effectEnvStepTable[];
static const uint16 _frequencyTable[];
};
} // End of namespace Scumm
#endif
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