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
|
////////////////////////////////////////////////////////////////////////////////////////
//
// Nestopia - NES/Famicom emulator written in C++
//
// Copyright (C) 2003-2008 Martin Freij
//
// This file is part of Nestopia.
//
// Nestopia 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.
//
// Nestopia 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 Nestopia; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
////////////////////////////////////////////////////////////////////////////////////////
#ifndef NST_BOARD_KONAMI_VRC6_H
#define NST_BOARD_KONAMI_VRC6_H
#ifdef NST_PRAGMA_ONCE
#pragma once
#endif
namespace Nes
{
namespace Core
{
namespace Boards
{
namespace Konami
{
class Vrc6 : public Board
{
public:
explicit Vrc6(const Context&);
class Sound : public Apu::Channel
{
public:
explicit Sound(Apu&,bool=true);
void WriteSquareReg0 (uint,uint);
void WriteSquareReg1 (uint,uint);
void WriteSquareReg2 (uint,uint);
void WriteSawReg0 (uint);
void WriteSawReg1 (uint);
void WriteSawReg2 (uint);
void SaveState(State::Saver&,dword) const;
void LoadState(State::Loader&);
protected:
void Reset();
bool UpdateSettings();
Sample GetSample();
private:
class BaseChannel
{
protected:
void Reset();
ibool enabled;
uint waveLength;
ibool active;
idword timer;
Cycle frequency;
uint step;
};
class Square : BaseChannel
{
public:
void Reset();
NST_SINGLE_CALL dword GetSample(Cycle);
NST_SINGLE_CALL void WriteReg0(uint);
NST_SINGLE_CALL void WriteReg1(uint,dword);
NST_SINGLE_CALL void WriteReg2(uint,dword);
void SaveState(State::Saver&,dword) const;
void LoadState(State::Loader&,uint);
void UpdateSettings(uint);
private:
bool CanOutput() const;
enum
{
VOLUME = OUTPUT_MUL * 2,
MIN_FRQ = 0x04
};
enum
{
REG0_VOLUME = 0x0F,
REG0_DUTY = 0x70,
REG0_DIGITIZED = 0x80,
REG1_WAVELENGTH_LOW = 0xFF,
REG2_WAVELENGTH_HIGH = 0x0F,
REG2_ENABLE = 0x80,
REG0_DUTY_SHIFT = 4
};
uint duty;
dword volume;
ibool digitized;
};
class Saw : BaseChannel
{
public:
void Reset();
NST_SINGLE_CALL dword GetSample(Cycle);
NST_SINGLE_CALL void WriteReg0(uint);
NST_SINGLE_CALL void WriteReg1(uint,dword);
NST_SINGLE_CALL void WriteReg2(uint,dword);
void SaveState(State::Saver&,dword) const;
void LoadState(State::Loader&,uint);
void UpdateSettings(uint);
private:
bool CanOutput() const;
enum
{
VOLUME = OUTPUT_MUL * 2,
MIN_FRQ = 0x4,
FRQ_SHIFT = 1
};
enum
{
REG0_PHASE = 0x3F,
REG1_WAVELENGTH_LOW = 0xFF,
REG2_WAVELENGTH_HIGH = 0x0F,
REG2_ENABLE = 0x80
};
uint phase;
dword amp;
};
uint output;
Cycle rate;
uint fixed;
Square square[2];
Saw saw;
DcBlocker dcBlocker;
};
private:
void SubReset(bool);
void SubSave(State::Saver&) const;
void SubLoad(State::Loader&,dword);
void Sync(Event,Input::Controllers*);
static uint GetPrgLineShift(const Context&,uint,uint);
NES_DECL_POKE( 9000 );
NES_DECL_POKE( 9001 );
NES_DECL_POKE( 9002 );
NES_DECL_POKE( A000 );
NES_DECL_POKE( A001 );
NES_DECL_POKE( A002 );
NES_DECL_POKE( B000 );
NES_DECL_POKE( B001 );
NES_DECL_POKE( B002 );
NES_DECL_POKE( B003 );
NES_DECL_POKE( F000 );
NES_DECL_POKE( F001 );
NES_DECL_POKE( F002 );
Vrc4::Irq irq;
Sound sound;
const uint prgLineA;
const uint prgLineB;
};
}
}
}
}
#endif
|
