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
|
/*
SuperCollider real time audio synthesis system
Copyright (c) 2002 James McCartney. All rights reserved.
http://www.audiosynth.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.
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
*/
#include "Samp.hpp"
#include "SC_Constants.h"
float32 gSine[kSineSize + 1];
float32 gPMSine[kSineSize + 1];
float32 gInvSine[kSineSize + 1];
float32 gSineWavetable[2 * kSineSize];
void SignalAsWavetable(float32* signal, float32* wavetable, long inSize) {
float32 val1, val2;
float32* in = signal;
float32* out = wavetable - 1;
for (int i = 0; i < inSize - 1; ++i) {
val1 = in[i];
val2 = in[i + 1];
*++out = 2.f * val1 - val2;
*++out = val2 - val1;
}
val1 = in[inSize - 1];
val2 = in[0];
*++out = 2.f * val1 - val2;
*++out = val2 - val1;
}
void WavetableAsSignal(float32* wavetable, float32* signal, long inSize) {
float32* in = wavetable - 1;
float32* out = signal - 1;
for (int i = 0; i < inSize; ++i) {
float32 a = *++in;
float32 b = *++in;
*++out = a + b;
}
}
class SynthLibInit {
public:
SynthLibInit() { FillTables(); }
void FillTables() {
double sineIndexToPhase = twopi / kSineSize;
double pmf = (1L << 29) / twopi;
for (int i = 0; i <= kSineSize; ++i) {
double phase = i * sineIndexToPhase;
float32 d = sin(phase);
gSine[i] = d;
gInvSine[i] = 1. / d;
gPMSine[i] = d * pmf;
}
SignalAsWavetable(gSine, gSineWavetable, kSineSize);
gInvSine[0] = gInvSine[kSineSize / 2] = gInvSine[kSineSize] = kBadValue;
int sz = kSineSize;
int sz2 = sz >> 1;
for (int i = 1; i <= 8; ++i) {
gInvSine[i] = gInvSine[sz - i] = kBadValue;
gInvSine[sz2 - i] = gInvSine[sz2 + i] = kBadValue;
}
}
};
static SynthLibInit gSynthLibInit;
|
