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
|
/***************************************************************************
c64sid.h - ReSid Wrapper for redefining the
filter
-------------------
begin : Fri Apr 4 2001
copyright : (C) 2001 by Simon White
email : s_a_white@email.com
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include "config.h"
#ifdef HAVE_EXCEPTIONS
# include <new>
#endif
#include "resid.h"
#include "resid-emu.h"
#include <string.h>
char ReSID::m_credit[];
ReSID::ReSID (sidbuilder *builder)
:sidemu(builder),
m_context(NULL),
#ifdef HAVE_EXCEPTIONS
m_sid(*(new(std::nothrow) RESID::SID)),
#else
m_sid(*(new RESID::SID)),
#endif
m_gain(100),
m_status(true),
m_locked(false)
{
char *p = m_credit;
m_error = "N/A";
// Setup credits
sprintf (p, "ReSID V%s Engine:", VERSION);
p += strlen (p) + 1;
strcpy (p, "\t(C) 1999-2002 Simon White <sidplay2@yahoo.com>");
p += strlen (p) + 1;
sprintf (p, "MOS6581 (SID) Emulation (ReSID V%s):", RESID::resid_version_string);
p += strlen (p) + 1;
sprintf (p, "\t(C) 1999-2002 Dag Lem <resid@nimrod.no>");
p += strlen (p) + 1;
*p = '\0';
if (!&m_sid)
{
m_error = "RESID ERROR: Unable to create sid object";
m_status = false;
return;
}
reset (0);
}
bool ReSID::filter (const sid_filter_t *filter)
{
RESID::fc_point fc[0x802];
const RESID::fc_point *f0 = fc;
int points = 0;
if (filter == NULL)
{ // Select default filter
m_sid.fc_default (f0, points);
}
else
{ // Make sure there are enough filter points and they are legal
points = filter->points;
if ((points < 2) || (points > 0x800))
return false;
{
const sid_fc_t fstart = {-1, 0};
const sid_fc_t *fprev = &fstart, *fin = filter->cutoff;
RESID::fc_point *fout = fc;
// Last check, make sure they are list in numerical order
// for both axis
while (points-- > 0)
{
if ((*fprev)[0] >= (*fin)[0])
return false;
fout++;
(*fout)[0] = (RESID::sound_sample) (*fin)[0];
(*fout)[1] = (RESID::sound_sample) (*fin)[1];
fprev = fin++;
}
// Updated ReSID interpolate requires we
// repeat the end points
(*(fout+1))[0] = (*fout)[0];
(*(fout+1))[1] = (*fout)[1];
fc[0][0] = fc[1][0];
fc[0][1] = fc[1][1];
points = filter->points + 2;
}
}
// function from reSID
points--;
RESID::interpolate (f0, f0 + points, m_sid.fc_plotter (), 1.0);
return true;
}
// Standard component options
void ReSID::reset (uint8_t volume)
{
m_accessClk = 0;
m_sid.reset ();
m_sid.write (0x18, volume);
}
uint8_t ReSID::read (uint_least8_t addr)
{
event_clock_t cycles = m_context->getTime (m_accessClk);
m_accessClk += cycles;
if (cycles)
m_sid.clock (cycles);
return m_sid.read (addr);
}
void ReSID::write (uint_least8_t addr, uint8_t data)
{
event_clock_t cycles = m_context->getTime (m_accessClk);
m_accessClk += cycles;
if (cycles)
m_sid.clock (cycles);
m_sid.write (addr, data);
}
int_least32_t ReSID::output (uint_least8_t bits)
{
event_clock_t cycles = m_context->getTime (m_accessClk);
m_accessClk += cycles;
if (cycles)
m_sid.clock (cycles);
return m_sid.output (bits) * m_gain / 100;
}
void ReSID::filter (bool enable)
{
m_sid.enable_filter (enable);
}
void ReSID::voice (uint_least8_t num, uint_least8_t volume,
bool mute)
{ // At this time only mute is supported
m_sid.mute (num, mute);
}
void ReSID::gain (int_least8_t percent)
{
// 0 to 99 is loss, 101 - 200 is gain
m_gain = percent;
m_gain += 100;
if (m_gain > 200)
m_gain = 200;
}
void ReSID::sampling (uint_least32_t freq)
{
m_sid.set_sampling_parameters (1000000, RESID::SAMPLE_FAST, freq);
}
// Set execution environment and lock sid to it
bool ReSID::lock (c64env *env)
{
if (env == NULL)
{
if (!m_locked)
return false;
m_locked = false;
m_context = NULL;
}
else
{
if (m_locked)
return false;
m_locked = true;
m_context = &env->context ();
}
return true;
}
// Set the emulated SID model
void ReSID::model (sid2_model_t model)
{
if (model == SID2_MOS8580)
m_sid.set_chip_model (RESID::MOS8580);
else
m_sid.set_chip_model (RESID::MOS6581);
}
|
