summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/machine/snesst10.c
blob: 4485f8d35dbc3140068772fdbf1f09b1f4973b16 (plain) (blame)
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
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
/***************************************************************************

    snesst10.c

    File to handle emulation of the SNES "Seta ST-010" add-on chip.

    Code based on original work by The Dumper, Matthew Kendora,
    Overload and Feather.
    This implementation is based on byuu's BSNES C++ version

    Byuu's code is released under GNU General Public License
    version 2 as published by the Free Software Foundation.
    The implementation below is released under the MAME license
    for use in MAME, MESS and derivatives by permission of the author.

***************************************************************************/

typedef struct
{
	INT16 x1, y1, quadrant, theta, o1;
	UINT8 *ram;
} _snes_st010_t;

static _snes_st010_t snes_st010;

static const INT16 st010_sin_table[256] = {
   0x0000,  0x0324,  0x0648,  0x096a,  0x0c8c,  0x0fab,  0x12c8,  0x15e2,
   0x18f9,  0x1c0b,  0x1f1a,  0x2223,  0x2528,  0x2826,  0x2b1f,  0x2e11,
   0x30fb,  0x33df,  0x36ba,  0x398c,  0x3c56,  0x3f17,  0x41ce,  0x447a,
   0x471c,  0x49b4,  0x4c3f,  0x4ebf,  0x5133,  0x539b,  0x55f5,  0x5842,
   0x5a82,  0x5cb3,  0x5ed7,  0x60eb,  0x62f1,  0x64e8,  0x66cf,  0x68a6,
   0x6a6d,  0x6c23,  0x6dc9,  0x6f5e,  0x70e2,  0x7254,  0x73b5,  0x7504,
   0x7641,  0x776b,  0x7884,  0x7989,  0x7a7c,  0x7b5c,  0x7c29,  0x7ce3,
   0x7d89,  0x7e1d,  0x7e9c,  0x7f09,  0x7f61,  0x7fa6,  0x7fd8,  0x7ff5,
   0x7fff,  0x7ff5,  0x7fd8,  0x7fa6,  0x7f61,  0x7f09,  0x7e9c,  0x7e1d,
   0x7d89,  0x7ce3,  0x7c29,  0x7b5c,  0x7a7c,  0x7989,  0x7884,  0x776b,
   0x7641,  0x7504,  0x73b5,  0x7254,  0x70e2,  0x6f5e,  0x6dc9,  0x6c23,
   0x6a6d,  0x68a6,  0x66cf,  0x64e8,  0x62f1,  0x60eb,  0x5ed7,  0x5cb3,
   0x5a82,  0x5842,  0x55f5,  0x539b,  0x5133,  0x4ebf,  0x4c3f,  0x49b4,
   0x471c,  0x447a,  0x41ce,  0x3f17,  0x3c56,  0x398c,  0x36ba,  0x33df,
   0x30fb,  0x2e11,  0x2b1f,  0x2826,  0x2528,  0x2223,  0x1f1a,  0x1c0b,
   0x18f8,  0x15e2,  0x12c8,  0x0fab,  0x0c8c,  0x096a,  0x0648,  0x0324,
   0x0000, -0x0324, -0x0648, -0x096b, -0x0c8c, -0x0fab, -0x12c8, -0x15e2,
  -0x18f9, -0x1c0b, -0x1f1a, -0x2223, -0x2528, -0x2826, -0x2b1f, -0x2e11,
  -0x30fb, -0x33df, -0x36ba, -0x398d, -0x3c56, -0x3f17, -0x41ce, -0x447a,
  -0x471c, -0x49b4, -0x4c3f, -0x4ebf, -0x5133, -0x539b, -0x55f5, -0x5842,
  -0x5a82, -0x5cb3, -0x5ed7, -0x60ec, -0x62f1, -0x64e8, -0x66cf, -0x68a6,
  -0x6a6d, -0x6c23, -0x6dc9, -0x6f5e, -0x70e2, -0x7254, -0x73b5, -0x7504,
  -0x7641, -0x776b, -0x7884, -0x7989, -0x7a7c, -0x7b5c, -0x7c29, -0x7ce3,
  -0x7d89, -0x7e1d, -0x7e9c, -0x7f09, -0x7f61, -0x7fa6, -0x7fd8, -0x7ff5,
  -0x7fff, -0x7ff5, -0x7fd8, -0x7fa6, -0x7f61, -0x7f09, -0x7e9c, -0x7e1d,
  -0x7d89, -0x7ce3, -0x7c29, -0x7b5c, -0x7a7c, -0x7989, -0x7883, -0x776b,
  -0x7641, -0x7504, -0x73b5, -0x7254, -0x70e2, -0x6f5e, -0x6dc9, -0x6c23,
  -0x6a6d, -0x68a6, -0x66cf, -0x64e8, -0x62f1, -0x60eb, -0x5ed7, -0x5cb3,
  -0x5a82, -0x5842, -0x55f5, -0x539a, -0x5133, -0x4ebf, -0x4c3f, -0x49b3,
  -0x471c, -0x447a, -0x41cd, -0x3f17, -0x3c56, -0x398c, -0x36b9, -0x33de,
  -0x30fb, -0x2e10, -0x2b1f, -0x2826, -0x2527, -0x2223, -0x1f19, -0x1c0b,
  -0x18f8, -0x15e2, -0x12c8, -0x0fab, -0x0c8b, -0x096a, -0x0647, -0x0324
};

static const INT16 st010_mode7_scale[176] = {
  0x0380,  0x0325,  0x02da,  0x029c,  0x0268,  0x023b,  0x0215,  0x01f3,
  0x01d5,  0x01bb,  0x01a3,  0x018e,  0x017b,  0x016a,  0x015a,  0x014b,
  0x013e,  0x0132,  0x0126,  0x011c,  0x0112,  0x0109,  0x0100,  0x00f8,
  0x00f0,  0x00e9,  0x00e3,  0x00dc,  0x00d6,  0x00d1,  0x00cb,  0x00c6,
  0x00c1,  0x00bd,  0x00b8,  0x00b4,  0x00b0,  0x00ac,  0x00a8,  0x00a5,
  0x00a2,  0x009e,  0x009b,  0x0098,  0x0095,  0x0093,  0x0090,  0x008d,
  0x008b,  0x0088,  0x0086,  0x0084,  0x0082,  0x0080,  0x007e,  0x007c,
  0x007a,  0x0078,  0x0076,  0x0074,  0x0073,  0x0071,  0x006f,  0x006e,
  0x006c,  0x006b,  0x0069,  0x0068,  0x0067,  0x0065,  0x0064,  0x0063,
  0x0062,  0x0060,  0x005f,  0x005e,  0x005d,  0x005c,  0x005b,  0x005a,
  0x0059,  0x0058,  0x0057,  0x0056,  0x0055,  0x0054,  0x0053,  0x0052,
  0x0051,  0x0051,  0x0050,  0x004f,  0x004e,  0x004d,  0x004d,  0x004c,
  0x004b,  0x004b,  0x004a,  0x0049,  0x0048,  0x0048,  0x0047,  0x0047,
  0x0046,  0x0045,  0x0045,  0x0044,  0x0044,  0x0043,  0x0042,  0x0042,
  0x0041,  0x0041,  0x0040,  0x0040,  0x003f,  0x003f,  0x003e,  0x003e,
  0x003d,  0x003d,  0x003c,  0x003c,  0x003b,  0x003b,  0x003a,  0x003a,
  0x003a,  0x0039,  0x0039,  0x0038,  0x0038,  0x0038,  0x0037,  0x0037,
  0x0036,  0x0036,  0x0036,  0x0035,  0x0035,  0x0035,  0x0034,  0x0034,
  0x0034,  0x0033,  0x0033,  0x0033,  0x0032,  0x0032,  0x0032,  0x0031,
  0x0031,  0x0031,  0x0030,  0x0030,  0x0030,  0x0030,  0x002f,  0x002f,
  0x002f,  0x002e,  0x002e,  0x002e,  0x002e,  0x002d,  0x002d,  0x002d,
  0x002d,  0x002c,  0x002c,  0x002c,  0x002c,  0x002b,  0x002b,  0x002b
};

static const UINT8 st010_arctan[32][32] = {
  { 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80 },
  { 0x80, 0xa0, 0xad, 0xb3, 0xb6, 0xb8, 0xb9, 0xba, 0xbb, 0xbb, 0xbc, 0xbc, 0xbd, 0xbd, 0xbd, 0xbd,
    0xbd, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbf, 0xbf, 0xbf, 0xbf },
  { 0x80, 0x93, 0xa0, 0xa8, 0xad, 0xb0, 0xb3, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xba, 0xbb,
    0xbb, 0xbb, 0xbb, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd },
  { 0x80, 0x8d, 0x98, 0xa0, 0xa6, 0xaa, 0xad, 0xb0, 0xb1, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb7, 0xb8,
    0xb8, 0xb9, 0xb9, 0xba, 0xba, 0xba, 0xba, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbc, 0xbc, 0xbc, 0xbc },
  { 0x80, 0x8a, 0x93, 0x9a, 0xa0, 0xa5, 0xa8, 0xab, 0xad, 0xaf, 0xb0, 0xb2, 0xb3, 0xb4, 0xb5, 0xb5,
    0xb6, 0xb7, 0xb7, 0xb8, 0xb8, 0xb8, 0xb9, 0xb9, 0xb9, 0xba, 0xba, 0xba, 0xba, 0xba, 0xbb, 0xbb },
  { 0x80, 0x88, 0x90, 0x96, 0x9b, 0xa0, 0xa4, 0xa7, 0xa9, 0xab, 0xad, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3,
    0xb4, 0xb4, 0xb5, 0xb6, 0xb6, 0xb6, 0xb7, 0xb7, 0xb8, 0xb8, 0xb8, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9 },
  { 0x80, 0x87, 0x8d, 0x93, 0x98, 0x9c, 0xa0, 0xa3, 0xa6, 0xa8, 0xaa, 0xac, 0xad, 0xae, 0xb0, 0xb0,
    0xb1, 0xb2, 0xb3, 0xb4, 0xb4, 0xb5, 0xb5, 0xb6, 0xb6, 0xb6, 0xb7, 0xb7, 0xb7, 0xb8, 0xb8, 0xb8 },
  { 0x80, 0x86, 0x8b, 0x90, 0x95, 0x99, 0x9d, 0xa0, 0xa3, 0xa5, 0xa7, 0xa9, 0xaa, 0xac, 0xad, 0xae,
    0xaf, 0xb0, 0xb1, 0xb2, 0xb2, 0xb3, 0xb3, 0xb4, 0xb4, 0xb5, 0xb5, 0xb6, 0xb6, 0xb6, 0xb7, 0xb7 },
  { 0x80, 0x85, 0x8a, 0x8f, 0x93, 0x97, 0x9a, 0x9d, 0xa0, 0xa2, 0xa5, 0xa6, 0xa8, 0xaa, 0xab, 0xac,
    0xad, 0xae, 0xaf, 0xb0, 0xb0, 0xb1, 0xb2, 0xb2, 0xb3, 0xb3, 0xb4, 0xb4, 0xb5, 0xb5, 0xb5, 0xb5 },
  { 0x80, 0x85, 0x89, 0x8d, 0x91, 0x95, 0x98, 0x9b, 0x9e, 0xa0, 0xa0, 0xa4, 0xa6, 0xa7, 0xa9, 0xaa,
    0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb0, 0xb1, 0xb1, 0xb2, 0xb2, 0xb3, 0xb3, 0xb4, 0xb4, 0xb4 },
  { 0x80, 0x84, 0x88, 0x8c, 0x90, 0x93, 0x96, 0x99, 0x9b, 0x9e, 0xa0, 0xa2, 0xa4, 0xa5, 0xa7, 0xa8,
    0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xaf, 0xb0, 0xb0, 0xb1, 0xb2, 0xb2, 0xb2, 0xb3, 0xb3 },
  { 0x80, 0x84, 0x87, 0x8b, 0x8e, 0x91, 0x94, 0x97, 0x9a, 0x9c, 0x9e, 0xa0, 0xa2, 0xa3, 0xa5, 0xa6,
    0xa7, 0xa9, 0xaa, 0xab, 0xac, 0xac, 0xad, 0xae, 0xae, 0xaf, 0xb0, 0xb0, 0xb1, 0xb1, 0xb2, 0xb2 },
  { 0x80, 0x83, 0x87, 0x8a, 0x8d, 0x90, 0x93, 0x96, 0x98, 0x9a, 0x9c, 0x9e, 0xa0, 0xa2, 0xa3, 0xa5,
    0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xac, 0xad, 0xae, 0xae, 0xaf, 0xb0, 0xb0, 0xb0, 0xb1 },
  { 0x80, 0x83, 0x86, 0x89, 0x8c, 0x8f, 0x92, 0x94, 0x96, 0x99, 0x9b, 0x9d, 0x9e, 0xa0, 0xa2, 0xa3,
    0xa4, 0xa5, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xac, 0xad, 0xae, 0xae, 0xaf, 0xaf, 0xb0 },
  { 0x80, 0x83, 0x86, 0x89, 0x8b, 0x8e, 0x90, 0x93, 0x95, 0x97, 0x99, 0x9b, 0x9d, 0x9e, 0xa0, 0xa1,
    0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xaa, 0xab, 0xac, 0xad, 0xad, 0xae, 0xae, 0xaf },
  { 0x80, 0x83, 0x85, 0x88, 0x8b, 0x8d, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9b, 0x9d, 0x9f, 0xa0,
    0xa1, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa8, 0xa9, 0xaa, 0xab, 0xab, 0xac, 0xad, 0xad, 0xae },
  { 0x80, 0x83, 0x85, 0x88, 0x8a, 0x8c, 0x8f, 0x91, 0x93, 0x95, 0x97, 0x99, 0x9a, 0x9c, 0x9d, 0x9f,
    0xa0, 0xa1, 0xa2, 0xa3, 0xa5, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xaa, 0xab, 0xab, 0xac, 0xad },
  { 0x80, 0x82, 0x85, 0x87, 0x89, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x97, 0x99, 0x9b, 0x9c, 0x9d,
    0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa8, 0xa9, 0xaa, 0xaa, 0xab, 0xac },
  { 0x80, 0x82, 0x85, 0x87, 0x89, 0x8b, 0x8d, 0x8f, 0x91, 0x93, 0x95, 0x96, 0x98, 0x99, 0x9b, 0x9c,
    0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab },
  { 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x95, 0x97, 0x98, 0x9a, 0x9b,
    0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa6, 0xa7, 0xa8, 0xa8, 0xa9, 0xaa },
  { 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x91, 0x93, 0x94, 0x96, 0x97, 0x99, 0x9a,
    0x9b, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa5, 0xa6, 0xa7, 0xa7, 0xa8, 0xa9 },
  { 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8b, 0x8d, 0x8f, 0x90, 0x92, 0x94, 0x95, 0x97, 0x98, 0x99,
    0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa4, 0xa5, 0xa6, 0xa6, 0xa7, 0xa8 },
  { 0x80, 0x82, 0x84, 0x86, 0x87, 0x89, 0x8b, 0x8d, 0x8e, 0x90, 0x91, 0x93, 0x94, 0x96, 0x97, 0x98,
    0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa3, 0xa4, 0xa5, 0xa6, 0xa6, 0xa7 },
  { 0x80, 0x82, 0x84, 0x85, 0x87, 0x89, 0x8a, 0x8c, 0x8e, 0x8f, 0x91, 0x92, 0x94, 0x95, 0x96, 0x98,
    0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa2, 0xa3, 0xa4, 0xa5, 0xa5, 0xa6 },
  { 0x80, 0x82, 0x83, 0x85, 0x87, 0x88, 0x8a, 0x8c, 0x8d, 0x8f, 0x90, 0x92, 0x93, 0x94, 0x96, 0x97,
    0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa2, 0xa3, 0xa4, 0xa5, 0xa5 },
  { 0x80, 0x82, 0x83, 0x85, 0x86, 0x88, 0x8a, 0x8b, 0x8d, 0x8e, 0x90, 0x91, 0x92, 0x94, 0x95, 0x96,
    0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa2, 0xa3, 0xa4, 0xa4 },
  { 0x80, 0x82, 0x83, 0x85, 0x86, 0x88, 0x89, 0x8b, 0x8c, 0x8e, 0x8f, 0x90, 0x92, 0x93, 0x94, 0x95,
    0x96, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa2, 0xa3, 0xa4 },
  { 0x80, 0x82, 0x83, 0x85, 0x86, 0x87, 0x89, 0x8a, 0x8c, 0x8d, 0x8e, 0x90, 0x91, 0x92, 0x93, 0x95,
    0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9e, 0x9f, 0xa0, 0xa1, 0xa1, 0xa2, 0xa3 },
  { 0x80, 0x81, 0x83, 0x84, 0x86, 0x87, 0x89, 0x8a, 0x8b, 0x8d, 0x8e, 0x8f, 0x90, 0x92, 0x93, 0x94,
    0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9e, 0x9f, 0xa0, 0xa1, 0xa1, 0xa2 },
  { 0x80, 0x81, 0x83, 0x84, 0x86, 0x87, 0x88, 0x8a, 0x8b, 0x8c, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93,
    0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0x9f, 0xa0, 0xa1, 0xa1 },
  { 0x80, 0x81, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8b, 0x8c, 0x8d, 0x8e, 0x90, 0x91, 0x92, 0x93,
    0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0x9f, 0xa0, 0xa1 },
  { 0x80, 0x81, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92,
    0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9c, 0x9d, 0x9e, 0x9f, 0x9f, 0xa0 }
};


static INT16 st010_sin( INT16 theta )
{
	return st010_sin_table[(theta >> 8) & 0xff];
}

static INT16 st010_cos( INT16 theta )
{
	return st010_sin_table[((theta + 0x4000) >> 8) & 0xff];
}

static UINT8 st010_readb( UINT16 address )
{
	return snes_st010.ram[address & 0xfff];
}

static UINT16 st010_readw( UINT16 address )
{
	return (st010_readb(address + 0) <<  0) |
			(st010_readb(address + 1) <<  8);
}

static UINT32 st010_readd( UINT16 address )
{
	return (st010_readb(address + 0) <<  0) |
			(st010_readb(address + 1) <<  8) |
			(st010_readb(address + 2) << 16) |
			(st010_readb(address + 3) << 24);
}

static void st010_writeb( UINT16 address, UINT8 data )
{
	snes_st010.ram[address & 0xfff] = data;
}

static void st010_writew( UINT16 address, UINT16 data )
{
	st010_writeb(address + 0, data >> 0);
	st010_writeb(address + 1, data >> 8);
}

static void st010_writed( UINT16 address, UINT32 data )
{
	st010_writeb(address + 0, data >>  0);
	st010_writeb(address + 1, data >>  8);
	st010_writeb(address + 2, data >> 16);
	st010_writeb(address + 3, data >> 24);
}

//

static void st010_op_01_do_work(INT16 x0, INT16 y0) {
  if((x0 < 0) && (y0 < 0)) {
    snes_st010.x1 = -x0;
    snes_st010.y1 = -y0;
    snes_st010.quadrant = -0x8000;
  } else if(x0 < 0) {
    snes_st010.x1 = y0;
    snes_st010.y1 = -x0;
    snes_st010.quadrant = -0x4000;
  } else if(y0 < 0) {
    snes_st010.x1 = -y0;
    snes_st010.y1 = x0;
    snes_st010.quadrant = 0x4000;
  } else {
    snes_st010.x1 = x0;
    snes_st010.y1 = y0;
    snes_st010.quadrant = 0x0000;
  }

  while((snes_st010.x1 > 0x1f) || (snes_st010.y1 > 0x1f)) {
    if(snes_st010.x1 > 1) { snes_st010.x1 >>= 1; }
    if(snes_st010.y1 > 1) { snes_st010.y1 >>= 1; }
  }

  if(snes_st010.y1 == 0) { snes_st010.quadrant += 0x4000; }

  snes_st010.theta = (st010_arctan[snes_st010.y1][snes_st010.x1] << 8) ^ snes_st010.quadrant;
}

//

static void st010_op_01( void ) {
  INT16 x0 = st010_readw(0x0000);
  INT16 y0 = st010_readw(0x0002);

  st010_op_01_do_work(x0, y0);

  st010_writew(0x0000, snes_st010.x1);
  st010_writew(0x0002, snes_st010.y1);
  st010_writew(0x0004, snes_st010.quadrant);
//st010_writew(0x0006, y0);  //Overload's docs note this write occurs, SNES9x disagrees
  st010_writew(0x0010, snes_st010.theta);
}

static void st010_op_02( void ) {
  INT16 positions = st010_readw(0x0024);
  UINT16 *places  = (UINT16*)(snes_st010.ram + 0x0040);
  UINT16 *drivers = (UINT16*)(snes_st010.ram + 0x0080);

  UINT8 sorted;
  UINT16 temp;
  int i;
  if(positions > 1) {
    do {
      sorted = 1;
      for(i = 0; i < positions - 1; i++) {
        if(places[i] < places[i + 1]) {
          temp = places[i + 1];
          places[i + 1] = places[i];
          places[i] = temp;

          temp = drivers[i + 1];
          drivers[i + 1] = drivers[i];
          drivers[i] = temp;

          sorted = 0;
        }
      }
      positions--;
    } while(!sorted);
  }
}

static void st010_op_03( void ) {
  INT16 x0 = st010_readw(0x0000);
  INT16 y0 = st010_readw(0x0002);
  INT16 multiplier = st010_readw(0x0004);
  INT32 x1, y1;

  x1 = x0 * multiplier << 1;
  y1 = y0 * multiplier << 1;

  st010_writed(0x0010, x1);
  st010_writed(0x0014, y1);
}

static void st010_op_04( void ) {
  INT16 x = st010_readw(0x0000);
  INT16 y = st010_readw(0x0002);
  INT16 square;
  //calculate the vector length of (x,y)
  square = sqrt((double)(y * y + x * x));

  st010_writew(0x0010, square);
}

// same as op_01_do_work, but we are only interested in the angle!
static void st010_op_05_do_work(INT16 x0, INT16 y0) {
  INT16 x1, y1, quadrant;
  if((x0 < 0) && (y0 < 0)) {
    x1 = -x0;
    y1 = -y0;
    quadrant = -0x8000;
  } else if(x0 < 0) {
    x1 = y0;
    y1 = -x0;
    quadrant = -0x4000;
  } else if(y0 < 0) {
    x1 = -y0;
    y1 = x0;
    quadrant = 0x4000;
  } else {
    x1 = x0;
    y1 = y0;
    quadrant = 0x0000;
  }

  while((x1 > 0x1f) || (y1 > 0x1f)) {
    if(x1 > 1) { x1 >>= 1; }
    if(y1 > 1) { y1 >>= 1; }
  }

  if(y1 == 0) { quadrant += 0x4000; }

  snes_st010.o1 = (st010_arctan[y1][x1] << 8) ^ quadrant;
}

static void st010_op_05( void ) {
  INT32 dx, dy;
  UINT16 o1 = 0;
  UINT8 wrap = 0;

  //target (x,y) coordinates
  INT16 ypos_max = st010_readw(0x00c0);
  INT16 xpos_max = st010_readw(0x00c2);

  //current coordinates and direction
  INT32 ypos = st010_readd(0x00c4);
  INT32 xpos = st010_readd(0x00c8);
  UINT16 rot = st010_readw(0x00cc);

  //physics
  UINT16 speed = st010_readw(0x00d4);
  UINT16 accel = st010_readw(0x00d6);
  UINT16 speed_max = st010_readw(0x00d8);
  UINT16 old_speed;

  //special condition acknowledgement
  INT16 system = st010_readw(0x00da);
  INT16 flags = st010_readw(0x00dc);

  //new target coordinates
  INT16 ypos_new = st010_readw(0x00de);
  INT16 xpos_new = st010_readw(0x00e0);

  //mask upper bit
  xpos_new &= 0x7fff;

  //get the current distance
  dx = xpos_max - (xpos >> 16);
  dy = ypos_max - (ypos >> 16);

  //quirk: clear and move in9
  st010_writew(0x00d2, 0xffff);
  st010_writew(0x00da, 0x0000);

  //grab the target angle
  st010_op_05_do_work(dy, dx);
  o1 = (UINT16)snes_st010.o1;

  //check for wrapping
  if(abs(o1 - rot) > 0x8000) {
    o1 += 0x8000;
    rot += 0x8000;
    wrap = 1;
  }

  old_speed = speed;

  //special case
  if(abs(o1 - rot) == 0x8000) {
    speed = 0x100;
  }

  //slow down for sharp curves
  else if(abs(o1 - rot) >= 0x1000) {
  UINT32 slow = abs(o1 - rot);
    slow >>= 4;  //scaling
    speed -= slow;
  }

  //otherwise accelerate
  else {
    speed += accel;
    if(speed > speed_max) {
      speed = speed_max;  //clip speed
    }
  }

  //prevent negative/positive overflow
  if(abs(old_speed - speed) > 0x8000) {
    if(old_speed < speed) { speed = 0; }
    else speed = 0xff00;
  }

  //adjust direction by so many degrees
  //be careful of negative adjustments
  if((o1 > rot && (o1 - rot) > 0x80) || (o1 < rot && (rot - o1) >= 0x80)) {
    if(o1 < rot) { rot -= 0x280; }
    else if(o1 > rot) { rot += 0x280; }
  }

  //turn off wrapping
  if(wrap) { rot -= 0x8000; }

  //now check the distances (store for later)
  dx = (xpos_max << 16) - xpos;
  dy = (ypos_max << 16) - ypos;
  dx >>= 16;
  dy >>= 16;

  //if we're in so many units of the target, signal it
  if((system && (dy <= 6 && dy >= -8) && (dx <= 126 && dx >= -128)) || (!system && (dx <= 6 && dx >= -8) && (dy <= 126 && dy >= -128))) {
    //announce our new destination and flag it
    xpos_max = xpos_new & 0x7fff;
    ypos_max = ypos_new;
    flags |= 0x08;
  }

  //update position
  xpos -= (st010_cos(rot) * 0x400 >> 15) * (speed >> 8) << 1;
  ypos -= (st010_sin(rot) * 0x400 >> 15) * (speed >> 8) << 1;

  //quirk: mask upper byte
  xpos &= 0x1fffffff;
  ypos &= 0x1fffffff;

  st010_writew(0x00c0, ypos_max);
  st010_writew(0x00c2, xpos_max);
  st010_writed(0x00c4, ypos);
  st010_writed(0x00c8, xpos);
  st010_writew(0x00cc, rot);
  st010_writew(0x00d4, speed);
  st010_writew(0x00dc, flags);
}

static void st010_op_06( void ) {
  INT16 multiplicand = st010_readw(0x0000);
  INT16 multiplier = st010_readw(0x0002);
  INT32 product;

  product = multiplicand * multiplier << 1;

  st010_writed(0x0010, product);
}

static void st010_op_07( void ) {
  INT16 theta = st010_readw(0x0000);

  INT16 data;
  int i, offset;
  for(i = 0, offset = 0; i < 176; i++) {
    data = st010_mode7_scale[i] * st010_cos(theta) >> 15;
    st010_writew(0x00f0 + offset, data);
    st010_writew(0x0510 + offset, data);

    data = st010_mode7_scale[i] * st010_sin(theta) >> 15;
    st010_writew(0x0250 + offset, data);
    if(data) { data = ~data; }
    st010_writew(0x03b0 + offset, data);

    offset += 2;
  }
}

static void st010_op_08( void ) {
  INT16 x0 = st010_readw(0x0000);
  INT16 y0 = st010_readw(0x0002);
  INT16 theta = st010_readw(0x0004);
  INT16 x1, y1;

  x1 = (y0 * st010_sin(theta) >> 15) + (x0 * st010_cos(theta) >> 15);
  y1 = (y0 * st010_cos(theta) >> 15) - (x0 * st010_sin(theta) >> 15);

  st010_writew(0x0010, x1);
  st010_writew(0x0012, y1);
}

// init, reset & handlers

static UINT8 st010_read( UINT16 address )
{
	return st010_readb(address);
}

static void st010_write( UINT16 address, UINT8 data )
{
	st010_writeb(address, data);

	if ((address & 0xfff) == 0x0021 && (data & 0x80))
	{
		switch (snes_st010.ram[0x0020])
		{
			case 0x01: st010_op_01(); break;
			case 0x02: st010_op_02(); break;
			case 0x03: st010_op_03(); break;
			case 0x04: st010_op_04(); break;
			case 0x05: st010_op_05(); break;
			case 0x06: st010_op_06(); break;
			case 0x07: st010_op_07(); break;
			case 0x08: st010_op_08(); break;
		}

		snes_st010.ram[0x0021] &= ~0x80;
	}
}


static void st010_init( running_machine* machine )
{
	snes_st010.ram = (UINT8*)auto_alloc_array(machine, UINT8, 0x1000);
}

static void st010_reset( void )
{
	snes_st010.x1 = 0;
	snes_st010.y1 = 0;
	snes_st010.quadrant = 0;
	snes_st010.theta = 0;
	memset(snes_st010.ram, 0, 0x1000);
}