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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
|
#include "kmsnddev.h"
#include "divfix.h"
#include "s_logtbl.h"
#include "s_deltat.h"
#include <string.h>
#define CPS_SHIFT 16
#define PHASE_SHIFT 16 /* 16(fix) */
typedef struct {
KMIF_SOUND_DEVICE kmif;
KMIF_LOGTABLE *logtbl;
struct YMDELTATPCMSOUND_COMMON_TAG {
Int32 mastervolume;
Int32 step;
Int32 output;
Uint32 cnt;
Uint32 cps;
Uint32 phase;
Uint32 deltan;
Uint32 scale;
Uint32 mem;
Uint32 play;
Uint32 start;
Uint32 stop;
Int32 level32;
Uint8 key;
Uint8 level;
Uint8 granuality;
Uint8 pad4_3;
Uint8 regs[0x10];
} common;
Uint8 *romrambuf;
Uint32 romrammask;
Uint8 *rambuf;
Uint32 rammask;
Uint8 *rombuf;
Uint32 rommask;
Uint8 ymdeltatpcm_type;
Uint8 memshift;
} YMDELTATPCMSOUND;
const static Uint8 table_step[8] =
{
1, 3, 5, 7, 9, 11, 13, 15,
};
const static Uint8 table_scale[16] =
{
57, 57, 57, 57, 77, 102, 128, 153,
57, 57, 57, 57, 77, 102, 128, 153,
};
__inline static void writeram(YMDELTATPCMSOUND *sndp, Uint32 v)
{
sndp->rambuf[(sndp->common.mem >> 1) & sndp->rammask] = v;
sndp->common.mem += 1 << 1;
}
__inline static Uint32 readram(YMDELTATPCMSOUND *sndp)
{
Uint32 v;
v = sndp->romrambuf[(sndp->common.play >> 1) & sndp->romrammask];
if (sndp->common.play & 1)
v &= 0x0F;
else
v >>= 4;
sndp->common.play += 1;
if (sndp->common.play >= sndp->common.stop)
{
if (sndp->common.regs[0] & 0x10)
{
sndp->common.play = sndp->common.start;
sndp->common.step = 0;
sndp->common.scale = 127;
}
else
{
sndp->common.key = 0;
}
}
return v;
}
__inline static void DelrtatStep(YMDELTATPCMSOUND *sndp, Uint32 data)
{
if (data & 8)
sndp->common.step -= (table_step[data & 7] * sndp->common.scale) >> 3;
else
sndp->common.step += (table_step[data & 7] * sndp->common.scale) >> 3;
if (sndp->common.step > ((1 << 15) - 1)) sndp->common.step = ((1 << 15) - 1);
if (sndp->common.step < -(1 << 15)) sndp->common.step = -(1 << 15);
sndp->common.scale = (sndp->common.scale * table_scale[data]) >> 6;
if (sndp->common.scale > 24576) sndp->common.scale = 24576;
if (sndp->common.scale < 127) sndp->common.scale = 127;
}
#if (((-1) >> 1) == -1)
#define SSR(x, y) (((Int32)x) >> (y))
#else
#define SSR(x, y) (((x) >= 0) ? ((x) >> (y)) : (-((-(x) - 1) >> (y)) - 1))
#endif
static int sndsynth(YMDELTATPCMSOUND *sndp )
{
if (!sndp->common.key)
return 0;
{
Uint32 step;
sndp->common.cnt += sndp->common.cps;
step = sndp->common.cnt >> CPS_SHIFT;
sndp->common.cnt &= (1 << CPS_SHIFT) - 1;
sndp->common.phase += step * sndp->common.deltan;
step = sndp->common.phase >> PHASE_SHIFT;
sndp->common.phase &= (1 << PHASE_SHIFT) - 1;
if (step)
{
do
{
DelrtatStep(sndp, readram(sndp));
} while (--step);
sndp->common.output = sndp->common.step * sndp->common.level32;
sndp->common.output = SSR(sndp->common.output, 8 + 2);
}
}
return sndp->common.output;
}
static void sndwrite(YMDELTATPCMSOUND *sndp, Uint32 a, Uint32 v)
{
sndp->common.regs[a] = v;
switch (a)
{
/* START,REC,MEMDATA,REPEAT,SPOFF,--,--,RESET */
case 0x00: /* Control Register 1 */
if ((v & 0x80) && !sndp->common.key)
{
sndp->common.key = 1;
sndp->common.play = sndp->common.start;
sndp->common.step = 0;
sndp->common.scale = 127;
}
if (v & 1) sndp->common.key = 0;
break;
/* L,R,-,-,SAMPLE,DA/AD,RAMTYPE,ROM */
case 0x01: /* Control Register 2 */
sndp->romrambuf = (sndp->common.regs[1] & 1) ? sndp->rombuf : sndp->rambuf;
sndp->romrammask = (sndp->common.regs[1] & 1) ? sndp->rommask : sndp->rammask;
break;
case 0x02: /* Start Address L */
case 0x03: /* Start Address H */
sndp->common.granuality = (v & 2) ? 1 : 4;
sndp->common.start = ((sndp->common.regs[3] << 8) + sndp->common.regs[2]) << (sndp->memshift + 1);
sndp->common.mem = sndp->common.start;
break;
case 0x04: /* Stop Address L */
case 0x05: /* Stop Address H */
sndp->common.stop = ((sndp->common.regs[5] << 8) + sndp->common.regs[4]) << (sndp->memshift + 1);
break;
case 0x06: /* Prescale L */
case 0x07: /* Prescale H */
break;
case 0x08: /* Data */
if ((sndp->common.regs[0] & 0x60) == 0x60) writeram(sndp, v);
break;
case 0x09: /* Delta-N L */
case 0x0A: /* Delta-N H */
sndp->common.deltan = (sndp->common.regs[0xA] << 8) + sndp->common.regs[0x9];
if (sndp->common.deltan < 0x100) sndp->common.deltan = 0x100;
break;
case 0x0B: /* Level Control */
sndp->common.level = v;
sndp->common.level32 = ((Int32)(sndp->common.level * LogToLin(sndp->logtbl, sndp->common.mastervolume, LOG_LIN_BITS - 15))) >> 7;
sndp->common.output = sndp->common.step * sndp->common.level32;
sndp->common.output = SSR(sndp->common.output, 8 + 2);
break;
}
}
static Uint32 sndread(YMDELTATPCMSOUND *sndp, Uint32 a)
{
return 0;
}
static void sndreset(YMDELTATPCMSOUND *sndp, Uint32 clock, Uint32 freq)
{
XMEMSET(&sndp->common, 0, sizeof(sndp->common));
sndp->common.cps = DivFix(clock, 72 * freq, CPS_SHIFT);
sndp->romrambuf = (sndp->common.regs[1] & 1) ? sndp->rombuf : sndp->rambuf;
sndp->romrammask = (sndp->common.regs[1] & 1) ? sndp->rommask : sndp->rammask;
sndp->common.granuality = 4;
}
static void sndvolume(YMDELTATPCMSOUND *sndp, Int32 volume)
{
volume = (volume << (LOG_BITS - 8)) << 1;
sndp->common.mastervolume = volume;
sndp->common.level32 = ((Int32)(sndp->common.level * LogToLin(sndp->logtbl, sndp->common.mastervolume, LOG_LIN_BITS - 15))) >> 7;
sndp->common.output = sndp->common.step * sndp->common.level32;
sndp->common.output = SSR(sndp->common.output, 8 + 2);
}
static void sndrelease(YMDELTATPCMSOUND *sndp)
{
if (sndp->logtbl) sndp->logtbl->release(sndp->logtbl->ctx);
XFREE(sndp);
}
static void setinst(YMDELTATPCMSOUND *sndp, Uint32 n, void *p, Uint32 l)
{
if (n) return;
if (p)
{
sndp->rombuf = (Uint8*) p;
sndp->rommask = l - 1;
sndp->romrambuf = (sndp->common.regs[1] & 1) ? sndp->rombuf : sndp->rambuf;
sndp->romrammask = (sndp->common.regs[1] & 1) ? sndp->rommask : sndp->rammask;
}
else
{
sndp->rombuf = 0;
sndp->rommask = 0;
}
}
KMIF_SOUND_DEVICE *YMDELTATPCMSoundAlloc(Uint32 ymdeltatpcm_type)
{
Uint32 ram_size;
YMDELTATPCMSOUND *sndp;
switch (ymdeltatpcm_type)
{
case YMDELTATPCM_TYPE_Y8950:
ram_size = 32 * 1024;
break;
case YMDELTATPCM_TYPE_YM2608:
ram_size = 256 * 1024;
break;
default:
ram_size = 0;
break;
}
sndp = (YMDELTATPCMSOUND*) XMALLOC(sizeof(YMDELTATPCMSOUND) + ram_size);
if (!sndp) return 0;
sndp->ymdeltatpcm_type = ymdeltatpcm_type;
switch (ymdeltatpcm_type)
{
case YMDELTATPCM_TYPE_Y8950:
sndp->memshift = 2;
break;
case YMDELTATPCM_TYPE_YM2608:
/* OPNA */
sndp->memshift = 6;
break;
case YMDELTATPCM_TYPE_YM2610:
sndp->memshift = 9;
break;
}
sndp->kmif.ctx = sndp;
sndp->kmif.release = (void (*)( void* )) sndrelease;
sndp->kmif.synth = (int (*)( void* )) sndsynth;
sndp->kmif.volume = (void (*)( void*, int )) sndvolume;
sndp->kmif.reset = (void (*)( void*, Uint32, Uint32 )) sndreset;
sndp->kmif.write = (void (*)( void*, Uint32, Uint32 )) sndwrite;
sndp->kmif.read = (Uint32 (*)( void*, Uint32 )) sndread;
sndp->kmif.setinst = (void (*)( void*, Uint32, void*, Uint32 )) setinst;
/* RAM */
sndp->rambuf = ram_size ? (Uint8 *)(sndp + 1) : 0;
sndp->rammask = ram_size ? (ram_size - 1) : 0;
/* ROM */
sndp->rombuf = 0;
sndp->rommask = 0;
sndp->logtbl = LogTableAddRef();
if (!sndp->logtbl)
{
sndrelease(sndp);
return 0;
}
return &sndp->kmif;
}
|
