source: buchla-68k/ram/wscalc.c@ e225e77

Last change on this file since e225e77 was e225e77, checked in by Thomas Lopatic <thomas@…>, 8 years ago

Added missing includes and declarations.
  • Property mode set to 100644
File size: 2.9 KB
Line 
1/*
2 =============================================================================
3 wscalc.c -- MIDAS-VII waveshape editor harmonic functions
4 Version 9 -- 1988-09-09 -- D.N. Lynx Crowe
5 =============================================================================
6*/
7
8#include "stddefs.h"
9#include "hwdefs.h"
10#include "graphdef.h"
11#include "vsdd.h"
12#include "macros.h"
13
14#include "midas.h"
15#include "wsdsp.h"
16
17#define WAVESMAX 1023
18#define WAVESMIN 1023
19
20extern int16_t curwhrm;
21
22extern int32_t hwave[NUMWPCAL];
23
24extern int16_t offsets[NUMWPCAL];
25extern int16_t vmtab[NUMHARM];
26extern int16_t wsbuf[NUMWPCAL];
27
28extern int32_t vknm[NUMHARM][NUMWPCAL];
29
30#include "knmtab.h" /* short knmtab[NUMHARM][NUMWPCAL]; */
31
32#include "memory.h"
33
34/*
35
36*/
37
38/*
39 =============================================================================
40 adj() -- adjust the coefficients in vknm[wshar][] for a new value
41 =============================================================================
42*/
43
44void adj(int16_t wshar)
45{
46 register int16_t wspnt;
47 register int32_t harval;
48 register int16_t *kp;
49 register int32_t *vp;
50
51 vp = &vknm[wshar][0];
52
53 harval = vmtab[wshar];
54
55 if (harval) {
56
57 kp = &knmtab[wshar][0];
58
59 for (wspnt = 0; wspnt < NUMWPCAL; wspnt++)
60 *vp++ = *kp++ * harval;
61
62 } else {
63
64 for (wspnt = 0; wspnt < NUMWPCAL; wspnt++)
65 *vp++ = 0;
66 }
67}
68
69/*
70
71*/
72
73/*
74 =============================================================================
75 wadj() -- adjust the coefficients for all harmonics
76 =============================================================================
77*/
78
79void wadj(void)
80{
81 register int16_t wshar;
82
83 for (wshar = 0; wshar < NUMHARM; wshar++)
84 adj(wshar);
85}
86
87/*
88 =============================================================================
89 clrwsa() -- clear waveshape table harmonic work areas
90 =============================================================================
91*/
92
93void clrwsa(void)
94{
95 memsetw(offsets, 0, NUMWPCAL);
96 memsetw(vknm, 0, (NUMHARM * NUMWPCAL) << 1);
97 memsetw(vmtab, 0, NUMHARM);
98}
99
100/*
101
102*/
103
104/*
105 =============================================================================
106 wscalc() -- calculate a waveshape from its harmonics and offsets
107 =============================================================================
108*/
109
110void wscalc(void)
111{
112 register int16_t wspnt, wshar;
113 register int32_t hfac, hmax, temp;
114
115 hmax = WAVESMIN; /* set minimum scaling value */
116
117 for (wspnt = 0; wspnt < NUMWPCAL; wspnt++) {
118
119 temp = 0; /* sum up the harmonics */
120
121 for (wshar = 0; wshar < NUMHARM; wshar++)
122 temp += vknm[wshar][wspnt];
123
124 /* add in the offsets */
125
126 hwave[wspnt] = (temp / 100) + offsets[wspnt];
127
128 /* adjust the maximum value seen */
129
130 if ((temp = abs(hwave[wspnt])) > hmax)
131 hmax = temp;
132 }
133
134 /* calculate the scale factor */
135
136 hfac = ((int32_t)WAVESMAX << 16) / hmax;
137
138 /* scale the waveshape */
139
140 for (wspnt = 0; wspnt < NUMWPCAL; wspnt++)
141 wsbuf[wspnt] = (hwave[wspnt] * hfac) >> 16;
142}
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