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
|
// license:???
// copyright-holders:Anthony Kruize
#ifndef __GBSOUND_H__
#define __GBSOUND_H__
#define MAX_FREQUENCIES 2048
struct SOUND
{
/* Common */
UINT8 on;
UINT8 channel;
INT32 length;
INT32 pos;
UINT32 period;
INT32 count;
INT8 mode;
/* Mode 1, 2, 3 */
INT8 duty;
/* Mode 1, 2, 4 */
INT32 env_value;
INT8 env_direction;
INT32 env_length;
INT32 env_count;
INT8 signal;
/* Mode 1 */
UINT32 frequency;
INT32 swp_shift;
INT32 swp_direction;
INT32 swp_time;
INT32 swp_count;
/* Mode 3 */
INT8 level;
UINT8 offset;
UINT32 dutycount;
/* Mode 4 */
INT32 ply_step;
INT16 ply_value;
};
struct SOUNDC
{
UINT8 on;
UINT8 vol_left;
UINT8 vol_right;
UINT8 mode1_left;
UINT8 mode1_right;
UINT8 mode2_left;
UINT8 mode2_right;
UINT8 mode3_left;
UINT8 mode3_right;
UINT8 mode4_left;
UINT8 mode4_right;
};
class gameboy_sound_device : public device_t,
public device_sound_interface
{
public:
gameboy_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
DECLARE_READ8_MEMBER(sound_r);
DECLARE_READ8_MEMBER(wave_r);
DECLARE_WRITE8_MEMBER(sound_w);
DECLARE_WRITE8_MEMBER(wave_w);
protected:
// device-level overrides
virtual void device_config_complete();
virtual void device_start();
virtual void device_reset();
// sound stream update overrides
virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
private:
void sound_w_internal(int offset, UINT8 data);
sound_stream *m_channel;
int m_rate;
INT32 m_env_length_table[8];
INT32 m_swp_time_table[8];
UINT32 m_period_table[MAX_FREQUENCIES];
UINT32 m_period_mode3_table[MAX_FREQUENCIES];
UINT32 m_period_mode4_table[8][16];
UINT32 m_length_table[64];
UINT32 m_length_mode3_table[256];
struct SOUND m_snd_1;
struct SOUND m_snd_2;
struct SOUND m_snd_3;
struct SOUND m_snd_4;
struct SOUNDC m_snd_control;
UINT8 m_snd_regs[0x30];
};
extern const device_type GAMEBOY;
#endif
|