aboutsummaryrefslogtreecommitdiff
path: root/engines/scumm/players/player_ad.h
blob: 20c8b3d475891a000d148c6a927d8fd0543c5925 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
/* 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_PLAYERS_PLAYER_AD_H
#define SCUMM_PLAYERS_PLAYER_AD_H

#include "scumm/music.h"

#include "common/mutex.h"
#include "common/serializer.h"

namespace OPL {
class OPL;
}

namespace Scumm {

class ScummEngine;

/**
 * Sound output for v3/v4 AdLib data.
 */
class Player_AD : public MusicEngine {
public:
	Player_AD(ScummEngine *scumm);
	virtual ~Player_AD();

	// MusicEngine API
	virtual void setMusicVolume(int vol);
	virtual void startSound(int sound);
	virtual void stopSound(int sound);
	virtual void stopAllSounds();
	virtual int  getMusicTimer();
	virtual int  getSoundStatus(int sound) const;

	virtual void saveLoadWithSerializer(Common::Serializer &ser);

	// Timer callback
	void onTimer();

private:
	ScummEngine *const _vm;
	Common::Mutex _mutex;

	void setupVolume();
	int _musicVolume;
	int _sfxVolume;

	OPL::OPL *_opl2;

	int _musicResource;
	int32 _engineMusicTimer;

	struct SfxSlot;

	struct HardwareChannel {
		bool allocated;
		int priority;
		SfxSlot *sfxOwner;
	} _hwChannels[9];
	int _numHWChannels;
	static const int _operatorOffsetToChannel[22];

	int allocateHWChannel(int priority, SfxSlot *owner = nullptr);
	void freeHWChannel(int channel);
	void limitHWChannels(int newCount);

	// AdLib register utilities
	uint8 _registerBackUpTable[256];
	void writeReg(int r, int v);
	uint8 readReg(int r) const;

	// Instrument setup
	void setupChannel(const uint channel, const byte *instrOffset);
	void setupOperator(const uint opr, const byte *&instrOffset);
	static const int _operatorOffsetTable[18];

	// Music handling
	void startMusic();
	void stopMusic();
	void updateMusic();
	bool parseCommand();
	uint parseVLQ();
	void noteOff(uint channel);
	void setupFrequency(uint channel, int8 frequency);
	void setupRhythm(uint rhythmInstr, uint instrOffset);

	const byte *_musicData;
	uint _timerLimit;
	uint _musicTicks;
	uint32 _musicTimer;
	uint32 _internalMusicTimer;
	bool _loopFlag;
	uint _musicLoopStart;
	uint _instrumentOffset[16];

	struct VoiceChannel {
		uint lastEvent;
		uint frequency;
		uint b0Reg;
	} _voiceChannels[9];
	void freeVoiceChannel(uint channel);

	void musicSeekTo(const uint position);
	bool _isSeeking;

	uint _mdvdrState;

	uint32 _curOffset;
	uint32 _nextEventTimer;

	static const uint _noteFrequencies[12];
	static const uint _mdvdrTable[6];
	static const uint _rhythmOperatorTable[6];
	static const uint _rhythmChannelTable[6];

	// SFX handling
	enum {
		kNoteStatePreInit = -1,
		kNoteStateAttack = 0,
		kNoteStateDecay = 1,
		kNoteStateSustain = 2,
		kNoteStateRelease = 3,
		kNoteStateOff = 4
	};

	struct Note {
		int state;
		int playTime;
		int sustainTimer;
		int instrumentValue;
		int bias;
		int preIncrease;
		int adjust;

		struct Envelope {
			int stepIncrease;
			int step;
			int stepCounter;
			int timer;
		} envelope;
	};

	enum {
		kChannelStateOff = 0,
		kChannelStateParse = 1,
		kChannelStatePlay = 2
	};

	struct Channel {
		int state;
		const byte *currentOffset;
		const byte *startOffset;
		uint8 instrumentData[7];

		Note notes[2];

		int hardwareChannel;
	};

	struct SfxSlot {
		int resource;
		int priority;

		Channel channels[3];
	} _sfx[3];

	SfxSlot *allocateSfxSlot(int priority);
	bool startSfx(SfxSlot *sfx, const byte *resource);
	void stopSfx(SfxSlot *sfx);

	void updateSfx();
	void clearChannel(const Channel &channel);
	void updateChannel(Channel *channel);
	void parseSlot(Channel *channel);
	void updateSlot(Channel *channel);
	void parseNote(Note *note, const Channel &channel, const byte *offset);
	bool processNote(Note *note, const Channel &channel, const byte *offset);
	void noteOffOn(int channel);
	void writeRegisterSpecial(int channel, uint8 value, int offset);
	uint8 readRegisterSpecial(int channel, uint8 defaultValue, int offset);
	void setupNoteEnvelopeState(Note *note, int steps, int adjust);
	bool processNoteEnvelope(Note *note);

	int _sfxTimer;

	uint8 _rndSeed;
	uint8 getRnd();

	static const uint _noteBiasTable[7];
	static const uint _numStepsTable[16];
	static const uint _noteAdjustScaleTable[7];
	static const uint _noteAdjustTable[16];
	static const bool _useOperatorTable[7];
	static const uint _channelOffsetTable[11];
	static const uint _channelOperatorOffsetTable[7];
	static const uint _baseRegisterTable[7];
	static const uint _registerMaskTable[7];
	static const uint _registerShiftTable[7];
};

} // End of namespace Scumm

#endif