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
|
/* 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 TOWNS_PC98_FMSYNTH_H
#define TOWNS_PC98_FMSYNTH_H
#include "audio/audiostream.h"
#include "audio/mixer.h"
#include "common/mutex.h"
#ifdef __DS__
/* This disables the rhythm channel when emulating the PC-98 type 86 sound card.
* The only purpose is code size reduction for certain backends.
* At the moment the only games which make use of the rhythm channel are the
* (very rare) PC-98 versions of Legend of Kyrandia 2 and Lands of Lore. Music will
* still be okay, just missing a couple of rhythm instruments.
*/
#define DISABLE_PC98_RHYTHM_CHANNEL
#endif
class TownsPC98_FmSynthOperator;
class TownsPC98_FmSynthSquareSineSource;
#ifndef DISABLE_PC98_RHYTHM_CHANNEL
class TownsPC98_FmSynthPercussionSource;
#endif
enum EnvelopeState {
kEnvReady = 0,
kEnvAttacking,
kEnvDecaying,
kEnvSustaining,
kEnvReleasing
};
class TownsPC98_FmSynth : public Audio::AudioStream {
public:
enum EmuType {
kTypeTowns,
kType26,
kType86
};
TownsPC98_FmSynth(Audio::Mixer *mixer, EmuType type, bool externalMutexHandling = false);
virtual ~TownsPC98_FmSynth();
virtual bool init();
virtual void reset();
void writeReg(uint8 part, uint8 regAddress, uint8 value);
// AudioStream interface
int readBuffer(int16 *buffer, const int numSamples);
bool isStereo() const;
bool endOfData() const;
int getRate() const;
protected:
void deinit();
// Implement this in your inherited class if your driver generates
// additional output that has to be inserted into the buffer.
virtual void nextTickEx(int32 *buffer, uint32 bufferSize) {}
void toggleRegProtection(bool prot) {
_regProtectionFlag = prot;
}
uint8 readSSGStatus();
virtual void timerCallbackA() = 0;
virtual void timerCallbackB() = 0;
// The audio driver can store and apply two different audio settings
// (usually for music and sound effects). The channel mask will determine
// which channels get effected by the setting. The first bits will be
// the normal fm channels, the next bits the ssg channels and the final
// bit the rhythm channel.
void setVolumeIntern(int volA, int volB);
void setVolumeChannelMasks(int channelMaskA, int channelMaskB);
const int _numChan;
const int _numSSG;
const bool _hasPercussion;
Common::Mutex _mutex;
bool _externalMutex;
private:
void generateTables();
void nextTick(int32 *buffer, uint32 bufferSize);
void generateOutput(int32 &leftSample, int32 &rightSample, int32 *del, int32 *feed);
struct ChanInternal {
ChanInternal();
~ChanInternal();
void ampModSensitivity(uint32 value) {
ampModSvty = (1 << (3 - value)) - (((value >> 1) & 1) | (value & 1));
}
void frqModSensitivity(uint32 value) {
frqModSvty = value << 5;
}
uint16 frqTemp;
uint8 fmIndex;
bool enableLeft;
bool enableRight;
bool updateEnvelopeParameters;
int32 feedbuf[3];
uint8 algorithm;
uint32 ampModSvty;
uint32 frqModSvty;
TownsPC98_FmSynthOperator *opr[4];
};
TownsPC98_FmSynthSquareSineSource *_ssg;
#ifndef DISABLE_PC98_RHYTHM_CHANNEL
TownsPC98_FmSynthPercussionSource *_prc;
#endif
ChanInternal *_chanInternal;
uint8 *_oprRates;
uint8 *_oprRateshift;
uint8 *_oprAttackDecay;
uint32 *_oprFrq;
uint32 *_oprSinTbl;
int32 *_oprLevelOut;
int32 *_oprDetune;
bool _regProtectionFlag;
typedef void (TownsPC98_FmSynth::*ChipTimerProc)();
void idleTimerCallback() {}
struct ChipTimer {
bool enabled;
uint16 value;
int32 smpTillCb;
uint32 smpTillCbRem;
int32 smpPerCb;
uint32 smpPerCbRem;
ChipTimerProc cb;
};
ChipTimer _timers[2];
int _volMaskA, _volMaskB;
uint16 _volumeA, _volumeB;
const float _baserate;
uint32 _timerbase;
uint32 _rtt;
Audio::Mixer *_mixer;
Audio::SoundHandle _soundHandle;
#ifndef DISABLE_PC98_RHYTHM_CHANNEL
static const uint8 _percussionData[];
#endif
static const uint32 _adtStat[];
static const uint8 _detSrc[];
static const int _ssgTables[];
bool _ready;
};
#endif
|
