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
|
// license:BSD-3-Clause
// copyright-holders:Juergen Buchmueller, Manuel Abadia
/**********************************************
Philips SAA1099 Sound driver
**********************************************/
#pragma once
#ifndef __SAA1099_H__
#define __SAA1099_H__
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_SAA1099_ADD(_tag, _clock) \
MCFG_DEVICE_ADD(_tag, SAA1099, _clock)
#define MCFG_SAA1099_REPLACE(_tag, _clock) \
MCFG_DEVICE_REPLACE(_tag, SAA1099, _clock)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
struct saa1099_channel
{
saa1099_channel() :
frequency(0),
freq_enable(0),
noise_enable(0),
octave(0),
counter(0.0),
freq(0.0),
level(0)
{
memset(amplitude, 0, sizeof(int)*2);
memset(envelope, 0, sizeof(int)*2);
}
int frequency; /* frequency (0x00..0xff) */
int freq_enable; /* frequency enable */
int noise_enable; /* noise enable */
int octave; /* octave (0x00..0x07) */
int amplitude[2]; /* amplitude (0x00..0x0f) */
int envelope[2]; /* envelope (0x00..0x0f or 0x10 == off) */
/* vars to simulate the square wave */
double counter;
double freq;
int level;
};
struct saa1099_noise
{
saa1099_noise() :
counter(0.0),
freq(0.0),
level(0) {}
/* vars to simulate the noise generator output */
double counter;
double freq;
int level; /* noise polynomal shifter */
};
// ======================> saa1099_device
class saa1099_device : public device_t,
public device_sound_interface
{
public:
saa1099_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
~saa1099_device() { }
protected:
// device-level overrides
virtual void device_start();
// sound stream update overrides
virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
public:
DECLARE_WRITE8_MEMBER( control_w );
DECLARE_WRITE8_MEMBER( data_w );
private:
void envelope_w(int ch);
private:
sound_stream *m_stream; /* our stream */
int m_noise_params[2]; /* noise generators parameters */
int m_env_enable[2]; /* envelope generators enable */
int m_env_reverse_right[2]; /* envelope reversed for right channel */
int m_env_mode[2]; /* envelope generators mode */
int m_env_bits[2]; /* non zero = 3 bits resolution */
int m_env_clock[2]; /* envelope clock mode (non-zero external) */
int m_env_step[2]; /* current envelope step */
int m_all_ch_enable; /* all channels enable */
int m_sync_state; /* sync all channels */
int m_selected_reg; /* selected register */
saa1099_channel m_channels[6]; /* channels */
saa1099_noise m_noise[2]; /* noise generators */
double m_sample_rate;
};
extern const device_type SAA1099;
#endif /* __SAA1099_H__ */
|