1 | /*****************************************************************************\ |
2 | Snes9x - Portable Super Nintendo Entertainment System (TM) emulator. |
3 | This file is licensed under the Snes9x License. |
4 | For further information, consult the LICENSE file in the root directory. |
5 | \*****************************************************************************/ |
6 | |
7 | /* |
8 | Due recognition and credit are given on Overload's DSP website. |
9 | Thank those contributors for their hard work on this chip. |
10 | |
11 | Fixed-point math reminder: |
12 | [sign, integer, fraction] |
13 | 1.15.00 * 1.15.00 = 2.30.00 -> 1.30.00 (DSP) -> 1.31.00 (LSB is '0') |
14 | 1.15.00 * 1.00.15 = 2.15.15 -> 1.15.15 (DSP) -> 1.15.16 (LSB is '0') |
15 | */ |
16 | |
17 | |
18 | #include "snes9x.h" |
19 | #include "memmap.h" |
20 | |
21 | #define DSP4_CLEAR_OUT() \ |
22 | { DSP4.out_count = 0; DSP4.out_index = 0; } |
23 | |
24 | #define DSP4_WRITE_BYTE(d) \ |
25 | { WRITE_WORD(DSP4.output + DSP4.out_count, (d)); DSP4.out_count++; } |
26 | |
27 | #define DSP4_WRITE_WORD(d) \ |
28 | { WRITE_WORD(DSP4.output + DSP4.out_count, (d)); DSP4.out_count += 2; } |
29 | |
30 | #ifndef MSB_FIRST |
31 | #define DSP4_WRITE_16_WORD(d) \ |
32 | { memcpy(DSP4.output + DSP4.out_count, (d), 32); DSP4.out_count += 32; } |
33 | #else |
34 | #define DSP4_WRITE_16_WORD(d) \ |
35 | { for (int p = 0; p < 16; p++) DSP4_WRITE_WORD((d)[p]); } |
36 | #endif |
37 | |
38 | // used to wait for dsp i/o |
39 | #define DSP4_WAIT(x) \ |
40 | DSP4.in_index = 0; DSP4.Logic = (x); return |
41 | |
42 | // 1.7.8 -> 1.15.16 |
43 | #define SEX78(a) (((int32) ((int16) (a))) << 8) |
44 | |
45 | // 1.15.0 -> 1.15.16 |
46 | #define SEX16(a) (((int32) ((int16) (a))) << 16) |
47 | |
48 | static int16 DSP4_READ_WORD (void); |
49 | static int32 DSP4_READ_DWORD (void); |
50 | static int16 DSP4_Inverse (int16); |
51 | static void DSP4_Multiply (int16, int16, int32 *); |
52 | static void DSP4_OP01 (void); |
53 | static void DSP4_OP03 (void); |
54 | static void DSP4_OP05 (void); |
55 | static void DSP4_OP06 (void); |
56 | static void DSP4_OP07 (void); |
57 | static void DSP4_OP08 (void); |
58 | static void DSP4_OP09 (void); |
59 | static void DSP4_OP0A (int16, int16 *, int16 *, int16 *, int16 *); |
60 | static void DSP4_OP0B (bool8 *, int16, int16, int16, bool8, bool8); |
61 | static void DSP4_OP0D (void); |
62 | static void DSP4_OP0E (void); |
63 | static void DSP4_OP0F (void); |
64 | static void DSP4_OP10 (void); |
65 | static void DSP4_OP11 (int16, int16, int16, int16, int16 *); |
66 | static void DSP4_SetByte (void); |
67 | static void DSP4_GetByte (void); |
68 | |
69 | |
70 | static int16 DSP4_READ_WORD (void) |
71 | { |
72 | int16 out; |
73 | |
74 | out = READ_WORD(DSP4.parameters + DSP4.in_index); |
75 | DSP4.in_index += 2; |
76 | |
77 | return (out); |
78 | } |
79 | |
80 | static int32 DSP4_READ_DWORD (void) |
81 | { |
82 | int32 out; |
83 | |
84 | out = READ_DWORD(DSP4.parameters + DSP4.in_index); |
85 | DSP4.in_index += 4; |
86 | |
87 | return (out); |
88 | } |
89 | |
90 | static int16 DSP4_Inverse (int16 value) |
91 | { |
92 | // Attention: This lookup table is not verified |
93 | const uint16 div_lut[64] = |
94 | { |
95 | 0x0000, 0x8000, 0x4000, 0x2aaa, 0x2000, 0x1999, 0x1555, 0x1249, |
96 | 0x1000, 0x0e38, 0x0ccc, 0x0ba2, 0x0aaa, 0x09d8, 0x0924, 0x0888, |
97 | 0x0800, 0x0787, 0x071c, 0x06bc, 0x0666, 0x0618, 0x05d1, 0x0590, |
98 | 0x0555, 0x051e, 0x04ec, 0x04bd, 0x0492, 0x0469, 0x0444, 0x0421, |
99 | 0x0400, 0x03e0, 0x03c3, 0x03a8, 0x038e, 0x0375, 0x035e, 0x0348, |
100 | 0x0333, 0x031f, 0x030c, 0x02fa, 0x02e8, 0x02d8, 0x02c8, 0x02b9, |
101 | 0x02aa, 0x029c, 0x028f, 0x0282, 0x0276, 0x026a, 0x025e, 0x0253, |
102 | 0x0249, 0x023e, 0x0234, 0x022b, 0x0222, 0x0219, 0x0210, 0x0208 |
103 | }; |
104 | |
105 | // saturate bounds |
106 | if (value < 0) |
107 | value = 0; |
108 | if (value > 63) |
109 | value = 63; |
110 | |
111 | return (div_lut[value]); |
112 | } |
113 | |
114 | static void DSP4_Multiply (int16 Multiplicand, int16 Multiplier, int32 *Product) |
115 | { |
116 | *Product = (Multiplicand * Multiplier << 1) >> 1; |
117 | } |
118 | |
119 | static void DSP4_OP01 (void) |
120 | { |
121 | DSP4.waiting4command = FALSE; |
122 | |
123 | // op flow control |
124 | switch (DSP4.Logic) |
125 | { |
126 | case 1: goto resume1; break; |
127 | case 2: goto resume2; break; |
128 | case 3: goto resume3; break; |
129 | } |
130 | |
131 | //////////////////////////////////////////////////// |
132 | // process initial inputs |
133 | |
134 | // sort inputs |
135 | DSP4.world_y = DSP4_READ_DWORD(); |
136 | DSP4.poly_bottom[0][0] = DSP4_READ_WORD(); |
137 | DSP4.poly_top[0][0] = DSP4_READ_WORD(); |
138 | DSP4.poly_cx[1][0] = DSP4_READ_WORD(); |
139 | DSP4.viewport_bottom = DSP4_READ_WORD(); |
140 | DSP4.world_x = DSP4_READ_DWORD(); |
141 | DSP4.poly_cx[0][0] = DSP4_READ_WORD(); |
142 | DSP4.poly_ptr[0][0] = DSP4_READ_WORD(); |
143 | DSP4.world_yofs = DSP4_READ_WORD(); |
144 | DSP4.world_dy = DSP4_READ_DWORD(); |
145 | DSP4.world_dx = DSP4_READ_DWORD(); |
146 | DSP4.distance = DSP4_READ_WORD(); |
147 | DSP4_READ_WORD(); // 0x0000 |
148 | DSP4.world_xenv = DSP4_READ_DWORD(); |
149 | DSP4.world_ddy = DSP4_READ_WORD(); |
150 | DSP4.world_ddx = DSP4_READ_WORD(); |
151 | DSP4.view_yofsenv = DSP4_READ_WORD(); |
152 | |
153 | // initial (x, y, offset) at starting raster line |
154 | DSP4.view_x1 = (DSP4.world_x + DSP4.world_xenv) >> 16; |
155 | DSP4.view_y1 = DSP4.world_y >> 16; |
156 | DSP4.view_xofs1 = DSP4.world_x >> 16; |
157 | DSP4.view_yofs1 = DSP4.world_yofs; |
158 | DSP4.view_turnoff_x = 0; |
159 | DSP4.view_turnoff_dx = 0; |
160 | |
161 | // first raster line |
162 | DSP4.poly_raster[0][0] = DSP4.poly_bottom[0][0]; |
163 | |
164 | do |
165 | { |
166 | //////////////////////////////////////////////////// |
167 | // process one iteration of projection |
168 | |
169 | // perspective projection of world (x, y, scroll) points |
170 | // based on the current projection lines |
171 | DSP4.view_x2 = (((DSP4.world_x + DSP4.world_xenv) >> 16) * DSP4.distance >> 15) + (DSP4.view_turnoff_x * DSP4.distance >> 15); |
172 | DSP4.view_y2 = (DSP4.world_y >> 16) * DSP4.distance >> 15; |
173 | DSP4.view_xofs2 = DSP4.view_x2; |
174 | DSP4.view_yofs2 = (DSP4.world_yofs * DSP4.distance >> 15) + DSP4.poly_bottom[0][0] - DSP4.view_y2; |
175 | |
176 | // 1. World x-location before transformation |
177 | // 2. Viewer x-position at the next |
178 | // 3. World y-location before perspective projection |
179 | // 4. Viewer y-position below the horizon |
180 | // 5. Number of raster lines drawn in this iteration |
181 | DSP4_CLEAR_OUT(); |
182 | DSP4_WRITE_WORD((DSP4.world_x + DSP4.world_xenv) >> 16); |
183 | DSP4_WRITE_WORD(DSP4.view_x2); |
184 | DSP4_WRITE_WORD(DSP4.world_y >> 16); |
185 | DSP4_WRITE_WORD(DSP4.view_y2); |
186 | |
187 | ////////////////////////////////////////////////////// |
188 | |
189 | // SR = 0x00 |
190 | |
191 | // determine # of raster lines used |
192 | DSP4.segments = DSP4.poly_raster[0][0] - DSP4.view_y2; |
193 | |
194 | // prevent overdraw |
195 | if (DSP4.view_y2 >= DSP4.poly_raster[0][0]) |
196 | DSP4.segments = 0; |
197 | else |
198 | DSP4.poly_raster[0][0] = DSP4.view_y2; |
199 | |
200 | // don't draw outside the window |
201 | if (DSP4.view_y2 < DSP4.poly_top[0][0]) |
202 | { |
203 | DSP4.segments = 0; |
204 | |
205 | // flush remaining raster lines |
206 | if (DSP4.view_y1 >= DSP4.poly_top[0][0]) |
207 | DSP4.segments = DSP4.view_y1 - DSP4.poly_top[0][0]; |
208 | } |
209 | |
210 | // SR = 0x80 |
211 | |
212 | DSP4_WRITE_WORD(DSP4.segments); |
213 | |
214 | ////////////////////////////////////////////////////// |
215 | |
216 | // scan next command if no SR check needed |
217 | if (DSP4.segments) |
218 | { |
219 | int32 px_dx, py_dy; |
220 | int32 x_scroll, y_scroll; |
221 | |
222 | // SR = 0x00 |
223 | |
224 | // linear interpolation (lerp) between projected points |
225 | px_dx = (DSP4.view_xofs2 - DSP4.view_xofs1) * DSP4_Inverse(DSP4.segments) << 1; |
226 | py_dy = (DSP4.view_yofs2 - DSP4.view_yofs1) * DSP4_Inverse(DSP4.segments) << 1; |
227 | |
228 | // starting step values |
229 | x_scroll = SEX16(DSP4.poly_cx[0][0] + DSP4.view_xofs1); |
230 | y_scroll = SEX16(-DSP4.viewport_bottom + DSP4.view_yofs1 + DSP4.view_yofsenv + DSP4.poly_cx[1][0] - DSP4.world_yofs); |
231 | |
232 | // SR = 0x80 |
233 | |
234 | // rasterize line |
235 | for (DSP4.lcv = 0; DSP4.lcv < DSP4.segments; DSP4.lcv++) |
236 | { |
237 | // 1. HDMA memory pointer (bg1) |
238 | // 2. vertical scroll offset ($210E) |
239 | // 3. horizontal scroll offset ($210D) |
240 | DSP4_WRITE_WORD(DSP4.poly_ptr[0][0]); |
241 | DSP4_WRITE_WORD((y_scroll + 0x8000) >> 16); |
242 | DSP4_WRITE_WORD((x_scroll + 0x8000) >> 16); |
243 | |
244 | // update memory address |
245 | DSP4.poly_ptr[0][0] -= 4; |
246 | |
247 | // update screen values |
248 | x_scroll += px_dx; |
249 | y_scroll += py_dy; |
250 | } |
251 | } |
252 | |
253 | //////////////////////////////////////////////////// |
254 | // Post-update |
255 | |
256 | // update new viewer (x, y, scroll) to last raster line drawn |
257 | DSP4.view_x1 = DSP4.view_x2; |
258 | DSP4.view_y1 = DSP4.view_y2; |
259 | DSP4.view_xofs1 = DSP4.view_xofs2; |
260 | DSP4.view_yofs1 = DSP4.view_yofs2; |
261 | |
262 | // add deltas for projection lines |
263 | DSP4.world_dx += SEX78(DSP4.world_ddx); |
264 | DSP4.world_dy += SEX78(DSP4.world_ddy); |
265 | |
266 | // update projection lines |
267 | DSP4.world_x += (DSP4.world_dx + DSP4.world_xenv); |
268 | DSP4.world_y += DSP4.world_dy; |
269 | |
270 | // update road turnoff position |
271 | DSP4.view_turnoff_x += DSP4.view_turnoff_dx; |
272 | |
273 | //////////////////////////////////////////////////// |
274 | // command check |
275 | |
276 | // scan next command |
277 | DSP4.in_count = 2; |
278 | DSP4_WAIT(1); |
279 | |
280 | resume1: |
281 | |
282 | // check for termination |
283 | DSP4.distance = DSP4_READ_WORD(); |
284 | if (DSP4.distance == -0x8000) |
285 | break; |
286 | |
287 | // road turnoff |
288 | if ((uint16) DSP4.distance == 0x8001) |
289 | { |
290 | DSP4.in_count = 6; |
291 | DSP4_WAIT(2); |
292 | |
293 | resume2: |
294 | |
295 | DSP4.distance = DSP4_READ_WORD(); |
296 | DSP4.view_turnoff_x = DSP4_READ_WORD(); |
297 | DSP4.view_turnoff_dx = DSP4_READ_WORD(); |
298 | |
299 | // factor in new changes |
300 | DSP4.view_x1 += (DSP4.view_turnoff_x * DSP4.distance >> 15); |
301 | DSP4.view_xofs1 += (DSP4.view_turnoff_x * DSP4.distance >> 15); |
302 | |
303 | // update stepping values |
304 | DSP4.view_turnoff_x += DSP4.view_turnoff_dx; |
305 | |
306 | DSP4.in_count = 2; |
307 | DSP4_WAIT(1); |
308 | } |
309 | |
310 | // already have 2 bytes read |
311 | DSP4.in_count = 6; |
312 | DSP4_WAIT(3); |
313 | |
314 | resume3: |
315 | |
316 | // inspect inputs |
317 | DSP4.world_ddy = DSP4_READ_WORD(); |
318 | DSP4.world_ddx = DSP4_READ_WORD(); |
319 | DSP4.view_yofsenv = DSP4_READ_WORD(); |
320 | |
321 | // no envelope here |
322 | DSP4.world_xenv = 0; |
323 | } |
324 | while (1); |
325 | |
326 | // terminate op |
327 | DSP4.waiting4command = TRUE; |
328 | } |
329 | |
330 | static void DSP4_OP03 (void) |
331 | { |
332 | DSP4.OAM_RowMax = 33; |
333 | memset(DSP4.OAM_Row, 0, 64); |
334 | } |
335 | |
336 | static void DSP4_OP05 (void) |
337 | { |
338 | DSP4.OAM_index = 0; |
339 | DSP4.OAM_bits = 0; |
340 | memset(DSP4.OAM_attr, 0, 32); |
341 | DSP4.sprite_count = 0; |
342 | } |
343 | |
344 | static void DSP4_OP06 (void) |
345 | { |
346 | DSP4_CLEAR_OUT(); |
347 | DSP4_WRITE_16_WORD(DSP4.OAM_attr); |
348 | } |
349 | |
350 | static void DSP4_OP07 (void) |
351 | { |
352 | DSP4.waiting4command = FALSE; |
353 | |
354 | // op flow control |
355 | switch (DSP4.Logic) |
356 | { |
357 | case 1: goto resume1; break; |
358 | case 2: goto resume2; break; |
359 | } |
360 | |
361 | //////////////////////////////////////////////////// |
362 | // sort inputs |
363 | |
364 | DSP4.world_y = DSP4_READ_DWORD(); |
365 | DSP4.poly_bottom[0][0] = DSP4_READ_WORD(); |
366 | DSP4.poly_top[0][0] = DSP4_READ_WORD(); |
367 | DSP4.poly_cx[1][0] = DSP4_READ_WORD(); |
368 | DSP4.viewport_bottom = DSP4_READ_WORD(); |
369 | DSP4.world_x = DSP4_READ_DWORD(); |
370 | DSP4.poly_cx[0][0] = DSP4_READ_WORD(); |
371 | DSP4.poly_ptr[0][0] = DSP4_READ_WORD(); |
372 | DSP4.world_yofs = DSP4_READ_WORD(); |
373 | DSP4.distance = DSP4_READ_WORD(); |
374 | DSP4.view_y2 = DSP4_READ_WORD(); |
375 | DSP4.view_dy = DSP4_READ_WORD() * DSP4.distance >> 15; |
376 | DSP4.view_x2 = DSP4_READ_WORD(); |
377 | DSP4.view_dx = DSP4_READ_WORD() * DSP4.distance >> 15; |
378 | DSP4.view_yofsenv = DSP4_READ_WORD(); |
379 | |
380 | // initial (x, y, offset) at starting raster line |
381 | DSP4.view_x1 = DSP4.world_x >> 16; |
382 | DSP4.view_y1 = DSP4.world_y >> 16; |
383 | DSP4.view_xofs1 = DSP4.view_x1; |
384 | DSP4.view_yofs1 = DSP4.world_yofs; |
385 | |
386 | // first raster line |
387 | DSP4.poly_raster[0][0] = DSP4.poly_bottom[0][0]; |
388 | |
389 | do |
390 | { |
391 | //////////////////////////////////////////////////// |
392 | // process one iteration of projection |
393 | |
394 | // add shaping |
395 | DSP4.view_x2 += DSP4.view_dx; |
396 | DSP4.view_y2 += DSP4.view_dy; |
397 | |
398 | // vertical scroll calculation |
399 | DSP4.view_xofs2 = DSP4.view_x2; |
400 | DSP4.view_yofs2 = (DSP4.world_yofs * DSP4.distance >> 15) + DSP4.poly_bottom[0][0] - DSP4.view_y2; |
401 | |
402 | // 1. Viewer x-position at the next |
403 | // 2. Viewer y-position below the horizon |
404 | // 3. Number of raster lines drawn in this iteration |
405 | DSP4_CLEAR_OUT(); |
406 | DSP4_WRITE_WORD(DSP4.view_x2); |
407 | DSP4_WRITE_WORD(DSP4.view_y2); |
408 | |
409 | ////////////////////////////////////////////////////// |
410 | |
411 | // SR = 0x00 |
412 | |
413 | // determine # of raster lines used |
414 | DSP4.segments = DSP4.view_y1 - DSP4.view_y2; |
415 | |
416 | // prevent overdraw |
417 | if (DSP4.view_y2 >= DSP4.poly_raster[0][0]) |
418 | DSP4.segments = 0; |
419 | else |
420 | DSP4.poly_raster[0][0] = DSP4.view_y2; |
421 | |
422 | // don't draw outside the window |
423 | if (DSP4.view_y2 < DSP4.poly_top[0][0]) |
424 | { |
425 | DSP4.segments = 0; |
426 | |
427 | // flush remaining raster lines |
428 | if (DSP4.view_y1 >= DSP4.poly_top[0][0]) |
429 | DSP4.segments = DSP4.view_y1 - DSP4.poly_top[0][0]; |
430 | } |
431 | |
432 | // SR = 0x80 |
433 | |
434 | DSP4_WRITE_WORD(DSP4.segments); |
435 | |
436 | ////////////////////////////////////////////////////// |
437 | |
438 | // scan next command if no SR check needed |
439 | if (DSP4.segments) |
440 | { |
441 | int32 px_dx, py_dy; |
442 | int32 x_scroll, y_scroll; |
443 | |
444 | // SR = 0x00 |
445 | |
446 | // linear interpolation (lerp) between projected points |
447 | px_dx = (DSP4.view_xofs2 - DSP4.view_xofs1) * DSP4_Inverse(DSP4.segments) << 1; |
448 | py_dy = (DSP4.view_yofs2 - DSP4.view_yofs1) * DSP4_Inverse(DSP4.segments) << 1; |
449 | |
450 | // starting step values |
451 | x_scroll = SEX16(DSP4.poly_cx[0][0] + DSP4.view_xofs1); |
452 | y_scroll = SEX16(-DSP4.viewport_bottom + DSP4.view_yofs1 + DSP4.view_yofsenv + DSP4.poly_cx[1][0] - DSP4.world_yofs); |
453 | |
454 | // SR = 0x80 |
455 | |
456 | // rasterize line |
457 | for (DSP4.lcv = 0; DSP4.lcv < DSP4.segments; DSP4.lcv++) |
458 | { |
459 | // 1. HDMA memory pointer (bg2) |
460 | // 2. vertical scroll offset ($2110) |
461 | // 3. horizontal scroll offset ($210F) |
462 | DSP4_WRITE_WORD(DSP4.poly_ptr[0][0]); |
463 | DSP4_WRITE_WORD((y_scroll + 0x8000) >> 16); |
464 | DSP4_WRITE_WORD((x_scroll + 0x8000) >> 16); |
465 | |
466 | // update memory address |
467 | DSP4.poly_ptr[0][0] -= 4; |
468 | |
469 | // update screen values |
470 | x_scroll += px_dx; |
471 | y_scroll += py_dy; |
472 | } |
473 | } |
474 | |
475 | ///////////////////////////////////////////////////// |
476 | // Post-update |
477 | |
478 | // update new viewer (x, y, scroll) to last raster line drawn |
479 | DSP4.view_x1 = DSP4.view_x2; |
480 | DSP4.view_y1 = DSP4.view_y2; |
481 | DSP4.view_xofs1 = DSP4.view_xofs2; |
482 | DSP4.view_yofs1 = DSP4.view_yofs2; |
483 | |
484 | //////////////////////////////////////////////////// |
485 | // command check |
486 | |
487 | // scan next command |
488 | DSP4.in_count = 2; |
489 | DSP4_WAIT(1); |
490 | |
491 | resume1: |
492 | |
493 | // check for opcode termination |
494 | DSP4.distance = DSP4_READ_WORD(); |
495 | if (DSP4.distance == -0x8000) |
496 | break; |
497 | |
498 | // already have 2 bytes in queue |
499 | DSP4.in_count = 10; |
500 | DSP4_WAIT(2); |
501 | |
502 | resume2: |
503 | |
504 | // inspect inputs |
505 | DSP4.view_y2 = DSP4_READ_WORD(); |
506 | DSP4.view_dy = DSP4_READ_WORD() * DSP4.distance >> 15; |
507 | DSP4.view_x2 = DSP4_READ_WORD(); |
508 | DSP4.view_dx = DSP4_READ_WORD() * DSP4.distance >> 15; |
509 | DSP4.view_yofsenv = DSP4_READ_WORD(); |
510 | } |
511 | while (1); |
512 | |
513 | DSP4.waiting4command = TRUE; |
514 | } |
515 | |
516 | static void DSP4_OP08 (void) |
517 | { |
518 | int16 win_left, win_right; |
519 | int16 view_x[2], view_y[2]; |
520 | int16 envelope[2][2]; |
521 | |
522 | DSP4.waiting4command = FALSE; |
523 | |
524 | // op flow control |
525 | switch (DSP4.Logic) |
526 | { |
527 | case 1: goto resume1; break; |
528 | case 2: goto resume2; break; |
529 | } |
530 | |
531 | //////////////////////////////////////////////////// |
532 | // process initial inputs for two polygons |
533 | |
534 | // clip values |
535 | DSP4.poly_clipRt[0][0] = DSP4_READ_WORD(); |
536 | DSP4.poly_clipRt[0][1] = DSP4_READ_WORD(); |
537 | DSP4.poly_clipRt[1][0] = DSP4_READ_WORD(); |
538 | DSP4.poly_clipRt[1][1] = DSP4_READ_WORD(); |
539 | |
540 | DSP4.poly_clipLf[0][0] = DSP4_READ_WORD(); |
541 | DSP4.poly_clipLf[0][1] = DSP4_READ_WORD(); |
542 | DSP4.poly_clipLf[1][0] = DSP4_READ_WORD(); |
543 | DSP4.poly_clipLf[1][1] = DSP4_READ_WORD(); |
544 | |
545 | // unknown (constant) (ex. 1P/2P = $00A6, $00A6, $00A6, $00A6) |
546 | DSP4_READ_WORD(); |
547 | DSP4_READ_WORD(); |
548 | DSP4_READ_WORD(); |
549 | DSP4_READ_WORD(); |
550 | |
551 | // unknown (constant) (ex. 1P/2P = $00A5, $00A5, $00A7, $00A7) |
552 | DSP4_READ_WORD(); |
553 | DSP4_READ_WORD(); |
554 | DSP4_READ_WORD(); |
555 | DSP4_READ_WORD(); |
556 | |
557 | // polygon centering (left, right) |
558 | DSP4.poly_cx[0][0] = DSP4_READ_WORD(); |
559 | DSP4.poly_cx[0][1] = DSP4_READ_WORD(); |
560 | DSP4.poly_cx[1][0] = DSP4_READ_WORD(); |
561 | DSP4.poly_cx[1][1] = DSP4_READ_WORD(); |
562 | |
563 | // HDMA pointer locations |
564 | DSP4.poly_ptr[0][0] = DSP4_READ_WORD(); |
565 | DSP4.poly_ptr[0][1] = DSP4_READ_WORD(); |
566 | DSP4.poly_ptr[1][0] = DSP4_READ_WORD(); |
567 | DSP4.poly_ptr[1][1] = DSP4_READ_WORD(); |
568 | |
569 | // starting raster line below the horizon |
570 | DSP4.poly_bottom[0][0] = DSP4_READ_WORD(); |
571 | DSP4.poly_bottom[0][1] = DSP4_READ_WORD(); |
572 | DSP4.poly_bottom[1][0] = DSP4_READ_WORD(); |
573 | DSP4.poly_bottom[1][1] = DSP4_READ_WORD(); |
574 | |
575 | // top boundary line to clip |
576 | DSP4.poly_top[0][0] = DSP4_READ_WORD(); |
577 | DSP4.poly_top[0][1] = DSP4_READ_WORD(); |
578 | DSP4.poly_top[1][0] = DSP4_READ_WORD(); |
579 | DSP4.poly_top[1][1] = DSP4_READ_WORD(); |
580 | |
581 | // unknown |
582 | // (ex. 1P = $2FC8, $0034, $FF5C, $0035) |
583 | // |
584 | // (ex. 2P = $3178, $0034, $FFCC, $0035) |
585 | // (ex. 2P = $2FC8, $0034, $FFCC, $0035) |
586 | DSP4_READ_WORD(); |
587 | DSP4_READ_WORD(); |
588 | DSP4_READ_WORD(); |
589 | DSP4_READ_WORD(); |
590 | |
591 | // look at guidelines for both polygon shapes |
592 | DSP4.distance = DSP4_READ_WORD(); |
593 | view_x[0] = DSP4_READ_WORD(); |
594 | view_y[0] = DSP4_READ_WORD(); |
595 | view_x[1] = DSP4_READ_WORD(); |
596 | view_y[1] = DSP4_READ_WORD(); |
597 | |
598 | // envelope shaping guidelines (one frame only) |
599 | envelope[0][0] = DSP4_READ_WORD(); |
600 | envelope[0][1] = DSP4_READ_WORD(); |
601 | envelope[1][0] = DSP4_READ_WORD(); |
602 | envelope[1][1] = DSP4_READ_WORD(); |
603 | |
604 | // starting base values to project from |
605 | DSP4.poly_start[0] = view_x[0]; |
606 | DSP4.poly_start[1] = view_x[1]; |
607 | |
608 | // starting raster lines to begin drawing |
609 | DSP4.poly_raster[0][0] = view_y[0]; |
610 | DSP4.poly_raster[0][1] = view_y[0]; |
611 | DSP4.poly_raster[1][0] = view_y[1]; |
612 | DSP4.poly_raster[1][1] = view_y[1]; |
613 | |
614 | // starting distances |
615 | DSP4.poly_plane[0] = DSP4.distance; |
616 | DSP4.poly_plane[1] = DSP4.distance; |
617 | |
618 | // SR = 0x00 |
619 | |
620 | // re-center coordinates |
621 | win_left = DSP4.poly_cx[0][0] - view_x[0] + envelope[0][0]; |
622 | win_right = DSP4.poly_cx[0][1] - view_x[0] + envelope[0][1]; |
623 | |
624 | // saturate offscreen data for polygon #1 |
625 | if (win_left < DSP4.poly_clipLf[0][0]) |
626 | win_left = DSP4.poly_clipLf[0][0]; |
627 | if (win_left > DSP4.poly_clipRt[0][0]) |
628 | win_left = DSP4.poly_clipRt[0][0]; |
629 | if (win_right < DSP4.poly_clipLf[0][1]) |
630 | win_right = DSP4.poly_clipLf[0][1]; |
631 | if (win_right > DSP4.poly_clipRt[0][1]) |
632 | win_right = DSP4.poly_clipRt[0][1]; |
633 | |
634 | // SR = 0x80 |
635 | |
636 | // initial output for polygon #1 |
637 | DSP4_CLEAR_OUT(); |
638 | DSP4_WRITE_BYTE(win_left & 0xff); |
639 | DSP4_WRITE_BYTE(win_right & 0xff); |
640 | |
641 | do |
642 | { |
643 | int16 polygon; |
644 | |
645 | //////////////////////////////////////////////////// |
646 | // command check |
647 | |
648 | // scan next command |
649 | DSP4.in_count = 2; |
650 | DSP4_WAIT(1); |
651 | |
652 | resume1: |
653 | |
654 | // terminate op |
655 | DSP4.distance = DSP4_READ_WORD(); |
656 | if (DSP4.distance == -0x8000) |
657 | break; |
658 | |
659 | // already have 2 bytes in queue |
660 | DSP4.in_count = 16; |
661 | DSP4_WAIT(2); |
662 | |
663 | resume2: |
664 | |
665 | // look at guidelines for both polygon shapes |
666 | view_x[0] = DSP4_READ_WORD(); |
667 | view_y[0] = DSP4_READ_WORD(); |
668 | view_x[1] = DSP4_READ_WORD(); |
669 | view_y[1] = DSP4_READ_WORD(); |
670 | |
671 | // envelope shaping guidelines (one frame only) |
672 | envelope[0][0] = DSP4_READ_WORD(); |
673 | envelope[0][1] = DSP4_READ_WORD(); |
674 | envelope[1][0] = DSP4_READ_WORD(); |
675 | envelope[1][1] = DSP4_READ_WORD(); |
676 | |
677 | //////////////////////////////////////////////////// |
678 | // projection begins |
679 | |
680 | // init |
681 | DSP4_CLEAR_OUT(); |
682 | |
683 | ////////////////////////////////////////////// |
684 | // solid polygon renderer - 2 shapes |
685 | |
686 | for (polygon = 0; polygon < 2; polygon++) |
687 | { |
688 | int32 left_inc, right_inc; |
689 | int16 x1_final, x2_final; |
690 | int16 env[2][2]; |
691 | int16 poly; |
692 | |
693 | // SR = 0x00 |
694 | |
695 | // # raster lines to draw |
696 | DSP4.segments = DSP4.poly_raster[polygon][0] - view_y[polygon]; |
697 | |
698 | // prevent overdraw |
699 | if (DSP4.segments > 0) |
700 | { |
701 | // bump drawing cursor |
702 | DSP4.poly_raster[polygon][0] = view_y[polygon]; |
703 | DSP4.poly_raster[polygon][1] = view_y[polygon]; |
704 | } |
705 | else |
706 | DSP4.segments = 0; |
707 | |
708 | // don't draw outside the window |
709 | if (view_y[polygon] < DSP4.poly_top[polygon][0]) |
710 | { |
711 | DSP4.segments = 0; |
712 | |
713 | // flush remaining raster lines |
714 | if (view_y[polygon] >= DSP4.poly_top[polygon][0]) |
715 | DSP4.segments = view_y[polygon] - DSP4.poly_top[polygon][0]; |
716 | } |
717 | |
718 | // SR = 0x80 |
719 | |
720 | // tell user how many raster structures to read in |
721 | DSP4_WRITE_WORD(DSP4.segments); |
722 | |
723 | // normal parameters |
724 | poly = polygon; |
725 | |
726 | ///////////////////////////////////////////////////// |
727 | |
728 | // scan next command if no SR check needed |
729 | if (DSP4.segments) |
730 | { |
731 | int32 w_left, w_right; |
732 | |
733 | // road turnoff selection |
734 | if ((uint16) envelope[polygon][0] == (uint16) 0xc001) |
735 | poly = 1; |
736 | else |
737 | if (envelope[polygon][1] == 0x3fff) |
738 | poly = 1; |
739 | |
740 | /////////////////////////////////////////////// |
741 | // left side of polygon |
742 | |
743 | // perspective correction on additional shaping parameters |
744 | env[0][0] = envelope[polygon][0] * DSP4.poly_plane[poly] >> 15; |
745 | env[0][1] = envelope[polygon][0] * DSP4.distance >> 15; |
746 | |
747 | // project new shapes (left side) |
748 | x1_final = view_x[poly] + env[0][0]; |
749 | x2_final = DSP4.poly_start[poly] + env[0][1]; |
750 | |
751 | // interpolate between projected points with shaping |
752 | left_inc = (x2_final - x1_final) * DSP4_Inverse(DSP4.segments) << 1; |
753 | if (DSP4.segments == 1) |
754 | left_inc = -left_inc; |
755 | |
756 | /////////////////////////////////////////////// |
757 | // right side of polygon |
758 | |
759 | // perspective correction on additional shaping parameters |
760 | env[1][0] = envelope[polygon][1] * DSP4.poly_plane[poly] >> 15; |
761 | env[1][1] = envelope[polygon][1] * DSP4.distance >> 15; |
762 | |
763 | // project new shapes (right side) |
764 | x1_final = view_x[poly] + env[1][0]; |
765 | x2_final = DSP4.poly_start[poly] + env[1][1]; |
766 | |
767 | // interpolate between projected points with shaping |
768 | right_inc = (x2_final - x1_final) * DSP4_Inverse(DSP4.segments) << 1; |
769 | if (DSP4.segments == 1) |
770 | right_inc = -right_inc; |
771 | |
772 | /////////////////////////////////////////////// |
773 | // update each point on the line |
774 | |
775 | w_left = SEX16(DSP4.poly_cx[polygon][0] - DSP4.poly_start[poly] + env[0][0]); |
776 | w_right = SEX16(DSP4.poly_cx[polygon][1] - DSP4.poly_start[poly] + env[1][0]); |
777 | |
778 | // update distance drawn into world |
779 | DSP4.poly_plane[polygon] = DSP4.distance; |
780 | |
781 | // rasterize line |
782 | for (DSP4.lcv = 0; DSP4.lcv < DSP4.segments; DSP4.lcv++) |
783 | { |
784 | int16 x_left, x_right; |
785 | |
786 | // project new coordinates |
787 | w_left += left_inc; |
788 | w_right += right_inc; |
789 | |
790 | // grab integer portion, drop fraction (no rounding) |
791 | x_left = w_left >> 16; |
792 | x_right = w_right >> 16; |
793 | |
794 | // saturate offscreen data |
795 | if (x_left < DSP4.poly_clipLf[polygon][0]) |
796 | x_left = DSP4.poly_clipLf[polygon][0]; |
797 | if (x_left > DSP4.poly_clipRt[polygon][0]) |
798 | x_left = DSP4.poly_clipRt[polygon][0]; |
799 | if (x_right < DSP4.poly_clipLf[polygon][1]) |
800 | x_right = DSP4.poly_clipLf[polygon][1]; |
801 | if (x_right > DSP4.poly_clipRt[polygon][1]) |
802 | x_right = DSP4.poly_clipRt[polygon][1]; |
803 | |
804 | // 1. HDMA memory pointer |
805 | // 2. Left window position ($2126/$2128) |
806 | // 3. Right window position ($2127/$2129) |
807 | DSP4_WRITE_WORD(DSP4.poly_ptr[polygon][0]); |
808 | DSP4_WRITE_BYTE(x_left & 0xff); |
809 | DSP4_WRITE_BYTE(x_right & 0xff); |
810 | |
811 | // update memory pointers |
812 | DSP4.poly_ptr[polygon][0] -= 4; |
813 | DSP4.poly_ptr[polygon][1] -= 4; |
814 | } // end rasterize line |
815 | } |
816 | |
817 | //////////////////////////////////////////////// |
818 | // Post-update |
819 | |
820 | // new projection spot to continue rasterizing from |
821 | DSP4.poly_start[polygon] = view_x[poly]; |
822 | } // end polygon rasterizer |
823 | } |
824 | while (1); |
825 | |
826 | // unknown output |
827 | DSP4_CLEAR_OUT(); |
828 | DSP4_WRITE_WORD(0); |
829 | |
830 | DSP4.waiting4command = TRUE; |
831 | } |
832 | |
833 | static void DSP4_OP09 (void) |
834 | { |
835 | DSP4.waiting4command = FALSE; |
836 | |
837 | // op flow control |
838 | switch (DSP4.Logic) |
839 | { |
840 | case 1: goto resume1; break; |
841 | case 2: goto resume2; break; |
842 | case 3: goto resume3; break; |
843 | case 4: goto resume4; break; |
844 | case 5: goto resume5; break; |
845 | case 6: goto resume6; break; |
846 | } |
847 | |
848 | //////////////////////////////////////////////////// |
849 | // process initial inputs |
850 | |
851 | // grab screen information |
852 | DSP4.viewport_cx = DSP4_READ_WORD(); |
853 | DSP4.viewport_cy = DSP4_READ_WORD(); |
854 | DSP4_READ_WORD(); // 0x0000 |
855 | DSP4.viewport_left = DSP4_READ_WORD(); |
856 | DSP4.viewport_right = DSP4_READ_WORD(); |
857 | DSP4.viewport_top = DSP4_READ_WORD(); |
858 | DSP4.viewport_bottom = DSP4_READ_WORD(); |
859 | |
860 | // starting raster line below the horizon |
861 | DSP4.poly_bottom[0][0] = DSP4.viewport_bottom - DSP4.viewport_cy; |
862 | DSP4.poly_raster[0][0] = 0x100; |
863 | |
864 | do |
865 | { |
866 | //////////////////////////////////////////////////// |
867 | // check for new sprites |
868 | |
869 | DSP4.in_count = 4; |
870 | DSP4_WAIT(1); |
871 | |
872 | resume1: |
873 | |
874 | //////////////////////////////////////////////// |
875 | // raster overdraw check |
876 | |
877 | DSP4.raster = DSP4_READ_WORD(); |
878 | |
879 | // continue updating the raster line where overdraw begins |
880 | if (DSP4.raster < DSP4.poly_raster[0][0]) |
881 | { |
882 | DSP4.sprite_clipy = DSP4.viewport_bottom - (DSP4.poly_bottom[0][0] - DSP4.raster); |
883 | DSP4.poly_raster[0][0] = DSP4.raster; |
884 | } |
885 | |
886 | ///////////////////////////////////////////////// |
887 | // identify sprite |
888 | |
889 | // op termination |
890 | DSP4.distance = DSP4_READ_WORD(); |
891 | if (DSP4.distance == -0x8000) |
892 | goto terminate; |
893 | |
894 | // no sprite |
895 | if (DSP4.distance == 0x0000) |
896 | continue; |
897 | |
898 | //////////////////////////////////////////////////// |
899 | // process projection information |
900 | |
901 | // vehicle sprite |
902 | if ((uint16) DSP4.distance == 0x9000) |
903 | { |
904 | int16 car_left, car_right, car_back; |
905 | int16 impact_left, impact_back; |
906 | int16 world_spx, world_spy; |
907 | int16 view_spx, view_spy; |
908 | uint16 energy; |
909 | |
910 | // we already have 4 bytes we want |
911 | DSP4.in_count = 14; |
912 | DSP4_WAIT(2); |
913 | |
914 | resume2: |
915 | |
916 | // filter inputs |
917 | energy = DSP4_READ_WORD(); |
918 | impact_back = DSP4_READ_WORD(); |
919 | car_back = DSP4_READ_WORD(); |
920 | impact_left = DSP4_READ_WORD(); |
921 | car_left = DSP4_READ_WORD(); |
922 | DSP4.distance = DSP4_READ_WORD(); |
923 | car_right = DSP4_READ_WORD(); |
924 | |
925 | // calculate car's world (x, y) values |
926 | world_spx = car_right - car_left; |
927 | world_spy = car_back; |
928 | |
929 | // add in collision vector [needs bit-twiddling] |
930 | world_spx -= energy * (impact_left - car_left) >> 16; |
931 | world_spy -= energy * (car_back - impact_back) >> 16; |
932 | |
933 | // perspective correction for world (x, y) |
934 | view_spx = world_spx * DSP4.distance >> 15; |
935 | view_spy = world_spy * DSP4.distance >> 15; |
936 | |
937 | // convert to screen values |
938 | DSP4.sprite_x = DSP4.viewport_cx + view_spx; |
939 | DSP4.sprite_y = DSP4.viewport_bottom - (DSP4.poly_bottom[0][0] - view_spy); |
940 | |
941 | // make the car's (x)-coordinate available |
942 | DSP4_CLEAR_OUT(); |
943 | DSP4_WRITE_WORD(world_spx); |
944 | |
945 | // grab a few remaining vehicle values |
946 | DSP4.in_count = 4; |
947 | DSP4_WAIT(3); |
948 | |
949 | resume3: |
950 | |
951 | // add vertical lift factor |
952 | DSP4.sprite_y += DSP4_READ_WORD(); |
953 | } |
954 | // terrain sprite |
955 | else |
956 | { |
957 | int16 world_spx, world_spy; |
958 | int16 view_spx, view_spy; |
959 | |
960 | // we already have 4 bytes we want |
961 | DSP4.in_count = 10; |
962 | DSP4_WAIT(4); |
963 | |
964 | resume4: |
965 | |
966 | // sort loop inputs |
967 | DSP4.poly_cx[0][0] = DSP4_READ_WORD(); |
968 | DSP4.poly_raster[0][1] = DSP4_READ_WORD(); |
969 | world_spx = DSP4_READ_WORD(); |
970 | world_spy = DSP4_READ_WORD(); |
971 | |
972 | // compute base raster line from the bottom |
973 | DSP4.segments = DSP4.poly_bottom[0][0] - DSP4.raster; |
974 | |
975 | // perspective correction for world (x, y) |
976 | view_spx = world_spx * DSP4.distance >> 15; |
977 | view_spy = world_spy * DSP4.distance >> 15; |
978 | |
979 | // convert to screen values |
980 | DSP4.sprite_x = DSP4.viewport_cx + view_spx - DSP4.poly_cx[0][0]; |
981 | DSP4.sprite_y = DSP4.viewport_bottom - DSP4.segments + view_spy; |
982 | } |
983 | |
984 | // default sprite size: 16x16 |
985 | DSP4.sprite_size = 1; |
986 | DSP4.sprite_attr = DSP4_READ_WORD(); |
987 | |
988 | //////////////////////////////////////////////////// |
989 | // convert tile data to SNES OAM format |
990 | |
991 | do |
992 | { |
993 | int16 sp_x, sp_y, sp_attr, sp_dattr; |
994 | int16 sp_dx, sp_dy; |
995 | int16 pixels; |
996 | uint16 ; |
997 | bool8 draw; |
998 | |
999 | DSP4.in_count = 2; |
1000 | DSP4_WAIT(5); |
1001 | |
1002 | resume5: |
1003 | |
1004 | draw = TRUE; |
1005 | |
1006 | // opcode termination |
1007 | DSP4.raster = DSP4_READ_WORD(); |
1008 | if (DSP4.raster == -0x8000) |
1009 | goto terminate; |
1010 | |
1011 | // stop code |
1012 | if (DSP4.raster == 0x0000 && !DSP4.sprite_size) |
1013 | break; |
1014 | |
1015 | // toggle sprite size |
1016 | if (DSP4.raster == 0x0000) |
1017 | { |
1018 | DSP4.sprite_size = !DSP4.sprite_size; |
1019 | continue; |
1020 | } |
1021 | |
1022 | // check for valid sprite header |
1023 | header = DSP4.raster; |
1024 | header >>= 8; |
1025 | if (header != 0x20 && |
1026 | header != 0x2e && // This is for attractor sprite |
1027 | header != 0x40 && |
1028 | header != 0x60 && |
1029 | header != 0xa0 && |
1030 | header != 0xc0 && |
1031 | header != 0xe0) |
1032 | break; |
1033 | |
1034 | // read in rest of sprite data |
1035 | DSP4.in_count = 4; |
1036 | DSP4_WAIT(6); |
1037 | |
1038 | resume6: |
1039 | |
1040 | draw = TRUE; |
1041 | |
1042 | ///////////////////////////////////// |
1043 | // process tile data |
1044 | |
1045 | // sprite deltas |
1046 | sp_dattr = DSP4.raster; |
1047 | sp_dy = DSP4_READ_WORD(); |
1048 | sp_dx = DSP4_READ_WORD(); |
1049 | |
1050 | // update coordinates to screen space |
1051 | sp_x = DSP4.sprite_x + sp_dx; |
1052 | sp_y = DSP4.sprite_y + sp_dy; |
1053 | |
1054 | // update sprite nametable/attribute information |
1055 | sp_attr = DSP4.sprite_attr + sp_dattr; |
1056 | |
1057 | // allow partially visibile tiles |
1058 | pixels = DSP4.sprite_size ? 15 : 7; |
1059 | |
1060 | DSP4_CLEAR_OUT(); |
1061 | |
1062 | // transparent tile to clip off parts of a sprite (overdraw) |
1063 | if (DSP4.sprite_clipy - pixels <= sp_y && sp_y <= DSP4.sprite_clipy && sp_x >= DSP4.viewport_left - pixels && sp_x <= DSP4.viewport_right && DSP4.sprite_clipy >= DSP4.viewport_top - pixels && DSP4.sprite_clipy <= DSP4.viewport_bottom) |
1064 | DSP4_OP0B(&draw, sp_x, DSP4.sprite_clipy, 0x00EE, DSP4.sprite_size, 0); |
1065 | |
1066 | // normal sprite tile |
1067 | if (sp_x >= DSP4.viewport_left - pixels && sp_x <= DSP4.viewport_right && sp_y >= DSP4.viewport_top - pixels && sp_y <= DSP4.viewport_bottom && sp_y <= DSP4.sprite_clipy) |
1068 | DSP4_OP0B(&draw, sp_x, sp_y, sp_attr, DSP4.sprite_size, 0); |
1069 | |
1070 | // no following OAM data |
1071 | DSP4_OP0B(&draw, 0, 0x0100, 0, 0, 1); |
1072 | } |
1073 | while (1); |
1074 | } |
1075 | while (1); |
1076 | |
1077 | terminate: |
1078 | DSP4.waiting4command = TRUE; |
1079 | } |
1080 | |
1081 | static void DSP4_OP0A (int16 n2, int16 *o1, int16 *o2, int16 *o3, int16 *o4) |
1082 | { |
1083 | const uint16 OP0A_Values[16] = |
1084 | { |
1085 | 0x0000, 0x0030, 0x0060, 0x0090, 0x00c0, 0x00f0, 0x0120, 0x0150, |
1086 | 0xfe80, 0xfeb0, 0xfee0, 0xff10, 0xff40, 0xff70, 0xffa0, 0xffd0 |
1087 | }; |
1088 | |
1089 | *o4 = OP0A_Values[(n2 & 0x000f)]; |
1090 | *o3 = OP0A_Values[(n2 & 0x00f0) >> 4]; |
1091 | *o2 = OP0A_Values[(n2 & 0x0f00) >> 8]; |
1092 | *o1 = OP0A_Values[(n2 & 0xf000) >> 12]; |
1093 | } |
1094 | |
1095 | static void DSP4_OP0B (bool8 *draw, int16 sp_x, int16 sp_y, int16 sp_attr, bool8 size, bool8 stop) |
1096 | { |
1097 | int16 Row1, Row2; |
1098 | |
1099 | // SR = 0x00 |
1100 | |
1101 | // align to nearest 8-pixel row |
1102 | Row1 = (sp_y >> 3) & 0x1f; |
1103 | Row2 = (Row1 + 1) & 0x1f; |
1104 | |
1105 | // check boundaries |
1106 | if (!((sp_y < 0) || ((sp_y & 0x01ff) < 0x00eb))) |
1107 | *draw = 0; |
1108 | |
1109 | if (size) |
1110 | { |
1111 | if (DSP4.OAM_Row[Row1] + 1 >= DSP4.OAM_RowMax) |
1112 | *draw = 0; |
1113 | if (DSP4.OAM_Row[Row2] + 1 >= DSP4.OAM_RowMax) |
1114 | *draw = 0; |
1115 | } |
1116 | else |
1117 | { |
1118 | if (DSP4.OAM_Row[Row1] >= DSP4.OAM_RowMax) |
1119 | *draw = 0; |
1120 | } |
1121 | |
1122 | // emulator fail-safe (unknown if this really exists) |
1123 | if (DSP4.sprite_count >= 128) |
1124 | *draw = 0; |
1125 | |
1126 | // SR = 0x80 |
1127 | |
1128 | if (*draw) |
1129 | { |
1130 | // Row tiles |
1131 | if (size) |
1132 | { |
1133 | DSP4.OAM_Row[Row1] += 2; |
1134 | DSP4.OAM_Row[Row2] += 2; |
1135 | } |
1136 | else |
1137 | DSP4.OAM_Row[Row1]++; |
1138 | |
1139 | // yield OAM output |
1140 | DSP4_WRITE_WORD(1); |
1141 | |
1142 | // pack OAM data: x, y, name, attr |
1143 | DSP4_WRITE_BYTE(sp_x & 0xff); |
1144 | DSP4_WRITE_BYTE(sp_y & 0xff); |
1145 | DSP4_WRITE_WORD(sp_attr); |
1146 | |
1147 | DSP4.sprite_count++; |
1148 | |
1149 | // OAM: size, msb data |
1150 | // save post-oam table data for future retrieval |
1151 | DSP4.OAM_attr[DSP4.OAM_index] |= ((sp_x < 0 || sp_x > 255) << DSP4.OAM_bits); |
1152 | DSP4.OAM_bits++; |
1153 | |
1154 | DSP4.OAM_attr[DSP4.OAM_index] |= (size << DSP4.OAM_bits); |
1155 | DSP4.OAM_bits++; |
1156 | |
1157 | // move to next byte in buffer |
1158 | if (DSP4.OAM_bits == 16) |
1159 | { |
1160 | DSP4.OAM_bits = 0; |
1161 | DSP4.OAM_index++; |
1162 | } |
1163 | } |
1164 | else |
1165 | if (stop) |
1166 | // yield no OAM output |
1167 | DSP4_WRITE_WORD(0); |
1168 | } |
1169 | |
1170 | static void DSP4_OP0D (void) |
1171 | { |
1172 | DSP4.waiting4command = FALSE; |
1173 | |
1174 | // op flow control |
1175 | switch (DSP4.Logic) |
1176 | { |
1177 | case 1: goto resume1; break; |
1178 | case 2: goto resume2; break; |
1179 | } |
1180 | |
1181 | //////////////////////////////////////////////////// |
1182 | // process initial inputs |
1183 | |
1184 | // sort inputs |
1185 | DSP4.world_y = DSP4_READ_DWORD(); |
1186 | DSP4.poly_bottom[0][0] = DSP4_READ_WORD(); |
1187 | DSP4.poly_top[0][0] = DSP4_READ_WORD(); |
1188 | DSP4.poly_cx[1][0] = DSP4_READ_WORD(); |
1189 | DSP4.viewport_bottom = DSP4_READ_WORD(); |
1190 | DSP4.world_x = DSP4_READ_DWORD(); |
1191 | DSP4.poly_cx[0][0] = DSP4_READ_WORD(); |
1192 | DSP4.poly_ptr[0][0] = DSP4_READ_WORD(); |
1193 | DSP4.world_yofs = DSP4_READ_WORD(); |
1194 | DSP4.world_dy = DSP4_READ_DWORD(); |
1195 | DSP4.world_dx = DSP4_READ_DWORD(); |
1196 | DSP4.distance = DSP4_READ_WORD(); |
1197 | DSP4_READ_WORD(); // 0x0000 |
1198 | DSP4.world_xenv = SEX78(DSP4_READ_WORD()); |
1199 | DSP4.world_ddy = DSP4_READ_WORD(); |
1200 | DSP4.world_ddx = DSP4_READ_WORD(); |
1201 | DSP4.view_yofsenv = DSP4_READ_WORD(); |
1202 | |
1203 | // initial (x, y, offset) at starting raster line |
1204 | DSP4.view_x1 = (DSP4.world_x + DSP4.world_xenv) >> 16; |
1205 | DSP4.view_y1 = DSP4.world_y >> 16; |
1206 | DSP4.view_xofs1 = DSP4.world_x >> 16; |
1207 | DSP4.view_yofs1 = DSP4.world_yofs; |
1208 | |
1209 | // first raster line |
1210 | DSP4.poly_raster[0][0] = DSP4.poly_bottom[0][0]; |
1211 | |
1212 | do |
1213 | { |
1214 | //////////////////////////////////////////////////// |
1215 | // process one iteration of projection |
1216 | |
1217 | // perspective projection of world (x, y, scroll) points |
1218 | // based on the current projection lines |
1219 | DSP4.view_x2 = (((DSP4.world_x + DSP4.world_xenv) >> 16) * DSP4.distance >> 15) + (DSP4.view_turnoff_x * DSP4.distance >> 15); |
1220 | DSP4.view_y2 = (DSP4.world_y >> 16) * DSP4.distance >> 15; |
1221 | DSP4.view_xofs2 = DSP4.view_x2; |
1222 | DSP4.view_yofs2 = (DSP4.world_yofs * DSP4.distance >> 15) + DSP4.poly_bottom[0][0] - DSP4.view_y2; |
1223 | |
1224 | // 1. World x-location before transformation |
1225 | // 2. Viewer x-position at the current |
1226 | // 3. World y-location before perspective projection |
1227 | // 4. Viewer y-position below the horizon |
1228 | // 5. Number of raster lines drawn in this iteration |
1229 | DSP4_CLEAR_OUT(); |
1230 | DSP4_WRITE_WORD((DSP4.world_x + DSP4.world_xenv) >> 16); |
1231 | DSP4_WRITE_WORD(DSP4.view_x2); |
1232 | DSP4_WRITE_WORD(DSP4.world_y >> 16); |
1233 | DSP4_WRITE_WORD(DSP4.view_y2); |
1234 | |
1235 | ////////////////////////////////////////////////////////// |
1236 | |
1237 | // SR = 0x00 |
1238 | |
1239 | // determine # of raster lines used |
1240 | DSP4.segments = DSP4.view_y1 - DSP4.view_y2; |
1241 | |
1242 | // prevent overdraw |
1243 | if (DSP4.view_y2 >= DSP4.poly_raster[0][0]) |
1244 | DSP4.segments = 0; |
1245 | else |
1246 | DSP4.poly_raster[0][0] = DSP4.view_y2; |
1247 | |
1248 | // don't draw outside the window |
1249 | if (DSP4.view_y2 < DSP4.poly_top[0][0]) |
1250 | { |
1251 | DSP4.segments = 0; |
1252 | |
1253 | // flush remaining raster lines |
1254 | if (DSP4.view_y1 >= DSP4.poly_top[0][0]) |
1255 | DSP4.segments = DSP4.view_y1 - DSP4.poly_top[0][0]; |
1256 | } |
1257 | |
1258 | // SR = 0x80 |
1259 | |
1260 | DSP4_WRITE_WORD(DSP4.segments); |
1261 | |
1262 | ////////////////////////////////////////////////////////// |
1263 | |
1264 | // scan next command if no SR check needed |
1265 | if (DSP4.segments) |
1266 | { |
1267 | int32 px_dx, py_dy; |
1268 | int32 x_scroll, y_scroll; |
1269 | |
1270 | // SR = 0x00 |
1271 | |
1272 | // linear interpolation (lerp) between projected points |
1273 | px_dx = (DSP4.view_xofs2 - DSP4.view_xofs1) * DSP4_Inverse(DSP4.segments) << 1; |
1274 | py_dy = (DSP4.view_yofs2 - DSP4.view_yofs1) * DSP4_Inverse(DSP4.segments) << 1; |
1275 | |
1276 | // starting step values |
1277 | x_scroll = SEX16(DSP4.poly_cx[0][0] + DSP4.view_xofs1); |
1278 | y_scroll = SEX16(-DSP4.viewport_bottom + DSP4.view_yofs1 + DSP4.view_yofsenv + DSP4.poly_cx[1][0] - DSP4.world_yofs); |
1279 | |
1280 | // SR = 0x80 |
1281 | |
1282 | // rasterize line |
1283 | for (DSP4.lcv = 0; DSP4.lcv < DSP4.segments; DSP4.lcv++) |
1284 | { |
1285 | // 1. HDMA memory pointer (bg1) |
1286 | // 2. vertical scroll offset ($210E) |
1287 | // 3. horizontal scroll offset ($210D) |
1288 | DSP4_WRITE_WORD(DSP4.poly_ptr[0][0]); |
1289 | DSP4_WRITE_WORD((y_scroll + 0x8000) >> 16); |
1290 | DSP4_WRITE_WORD((x_scroll + 0x8000) >> 16); |
1291 | |
1292 | // update memory address |
1293 | DSP4.poly_ptr[0][0] -= 4; |
1294 | |
1295 | // update screen values |
1296 | x_scroll += px_dx; |
1297 | y_scroll += py_dy; |
1298 | } |
1299 | } |
1300 | |
1301 | ///////////////////////////////////////////////////// |
1302 | // Post-update |
1303 | |
1304 | // update new viewer (x, y, scroll) to last raster line drawn |
1305 | DSP4.view_x1 = DSP4.view_x2; |
1306 | DSP4.view_y1 = DSP4.view_y2; |
1307 | DSP4.view_xofs1 = DSP4.view_xofs2; |
1308 | DSP4.view_yofs1 = DSP4.view_yofs2; |
1309 | |
1310 | // add deltas for projection lines |
1311 | DSP4.world_dx += SEX78(DSP4.world_ddx); |
1312 | DSP4.world_dy += SEX78(DSP4.world_ddy); |
1313 | |
1314 | // update projection lines |
1315 | DSP4.world_x += (DSP4.world_dx + DSP4.world_xenv); |
1316 | DSP4.world_y += DSP4.world_dy; |
1317 | |
1318 | //////////////////////////////////////////////////// |
1319 | // command check |
1320 | |
1321 | // scan next command |
1322 | DSP4.in_count = 2; |
1323 | DSP4_WAIT(1); |
1324 | |
1325 | resume1: |
1326 | |
1327 | // inspect input |
1328 | DSP4.distance = DSP4_READ_WORD(); |
1329 | |
1330 | // terminate op |
1331 | if (DSP4.distance == -0x8000) |
1332 | break; |
1333 | |
1334 | // already have 2 bytes in queue |
1335 | DSP4.in_count = 6; |
1336 | DSP4_WAIT(2); |
1337 | |
1338 | resume2: |
1339 | |
1340 | // inspect inputs |
1341 | DSP4.world_ddy = DSP4_READ_WORD(); |
1342 | DSP4.world_ddx = DSP4_READ_WORD(); |
1343 | DSP4.view_yofsenv = DSP4_READ_WORD(); |
1344 | |
1345 | // no envelope here |
1346 | DSP4.world_xenv = 0; |
1347 | } |
1348 | while (1); |
1349 | |
1350 | DSP4.waiting4command = TRUE; |
1351 | } |
1352 | |
1353 | static void DSP4_OP0E (void) |
1354 | { |
1355 | DSP4.OAM_RowMax = 16; |
1356 | memset(DSP4.OAM_Row, 0, 64); |
1357 | } |
1358 | |
1359 | static void DSP4_OP0F (void) |
1360 | { |
1361 | DSP4.waiting4command = FALSE; |
1362 | |
1363 | // op flow control |
1364 | switch (DSP4.Logic) |
1365 | { |
1366 | case 1: goto resume1; break; |
1367 | case 2: goto resume2; break; |
1368 | case 3: goto resume3; break; |
1369 | case 4: goto resume4; break; |
1370 | } |
1371 | |
1372 | //////////////////////////////////////////////////// |
1373 | // process initial inputs |
1374 | |
1375 | // sort inputs |
1376 | DSP4_READ_WORD(); // 0x0000 |
1377 | DSP4.world_y = DSP4_READ_DWORD(); |
1378 | DSP4.poly_bottom[0][0] = DSP4_READ_WORD(); |
1379 | DSP4.poly_top[0][0] = DSP4_READ_WORD(); |
1380 | DSP4.poly_cx[1][0] = DSP4_READ_WORD(); |
1381 | DSP4.viewport_bottom = DSP4_READ_WORD(); |
1382 | DSP4.world_x = DSP4_READ_DWORD(); |
1383 | DSP4.poly_cx[0][0] = DSP4_READ_WORD(); |
1384 | DSP4.poly_ptr[0][0] = DSP4_READ_WORD(); |
1385 | DSP4.world_yofs = DSP4_READ_WORD(); |
1386 | DSP4.world_dy = DSP4_READ_DWORD(); |
1387 | DSP4.world_dx = DSP4_READ_DWORD(); |
1388 | DSP4.distance = DSP4_READ_WORD(); |
1389 | DSP4_READ_WORD(); // 0x0000 |
1390 | DSP4.world_xenv = DSP4_READ_DWORD(); |
1391 | DSP4.world_ddy = DSP4_READ_WORD(); |
1392 | DSP4.world_ddx = DSP4_READ_WORD(); |
1393 | DSP4.view_yofsenv = DSP4_READ_WORD(); |
1394 | |
1395 | // initial (x, y, offset) at starting raster line |
1396 | DSP4.view_x1 = (DSP4.world_x + DSP4.world_xenv) >> 16; |
1397 | DSP4.view_y1 = DSP4.world_y >> 16; |
1398 | DSP4.view_xofs1 = DSP4.world_x >> 16; |
1399 | DSP4.view_yofs1 = DSP4.world_yofs; |
1400 | DSP4.view_turnoff_x = 0; |
1401 | DSP4.view_turnoff_dx = 0; |
1402 | |
1403 | // first raster line |
1404 | DSP4.poly_raster[0][0] = DSP4.poly_bottom[0][0]; |
1405 | |
1406 | do |
1407 | { |
1408 | //////////////////////////////////////////////////// |
1409 | // process one iteration of projection |
1410 | |
1411 | // perspective projection of world (x, y, scroll) points |
1412 | // based on the current projection lines |
1413 | DSP4.view_x2 = ((DSP4.world_x + DSP4.world_xenv) >> 16) * DSP4.distance >> 15; |
1414 | DSP4.view_y2 = (DSP4.world_y >> 16) * DSP4.distance >> 15; |
1415 | DSP4.view_xofs2 = DSP4.view_x2; |
1416 | DSP4.view_yofs2 = (DSP4.world_yofs * DSP4.distance >> 15) + DSP4.poly_bottom[0][0] - DSP4.view_y2; |
1417 | |
1418 | // 1. World x-location before transformation |
1419 | // 2. Viewer x-position at the next |
1420 | // 3. World y-location before perspective projection |
1421 | // 4. Viewer y-position below the horizon |
1422 | // 5. Number of raster lines drawn in this iteration |
1423 | DSP4_CLEAR_OUT(); |
1424 | DSP4_WRITE_WORD((DSP4.world_x + DSP4.world_xenv) >> 16); |
1425 | DSP4_WRITE_WORD(DSP4.view_x2); |
1426 | DSP4_WRITE_WORD(DSP4.world_y >> 16); |
1427 | DSP4_WRITE_WORD(DSP4.view_y2); |
1428 | |
1429 | ////////////////////////////////////////////////////// |
1430 | |
1431 | // SR = 0x00 |
1432 | |
1433 | // determine # of raster lines used |
1434 | DSP4.segments = DSP4.poly_raster[0][0] - DSP4.view_y2; |
1435 | |
1436 | // prevent overdraw |
1437 | if (DSP4.view_y2 >= DSP4.poly_raster[0][0]) |
1438 | DSP4.segments = 0; |
1439 | else |
1440 | DSP4.poly_raster[0][0] = DSP4.view_y2; |
1441 | |
1442 | // don't draw outside the window |
1443 | if (DSP4.view_y2 < DSP4.poly_top[0][0]) |
1444 | { |
1445 | DSP4.segments = 0; |
1446 | |
1447 | // flush remaining raster lines |
1448 | if (DSP4.view_y1 >= DSP4.poly_top[0][0]) |
1449 | DSP4.segments = DSP4.view_y1 - DSP4.poly_top[0][0]; |
1450 | } |
1451 | |
1452 | // SR = 0x80 |
1453 | |
1454 | DSP4_WRITE_WORD(DSP4.segments); |
1455 | |
1456 | ////////////////////////////////////////////////////// |
1457 | |
1458 | // scan next command if no SR check needed |
1459 | if (DSP4.segments) |
1460 | { |
1461 | int32 px_dx, py_dy; |
1462 | int32 x_scroll, y_scroll; |
1463 | |
1464 | for (DSP4.lcv = 0; DSP4.lcv < 4; DSP4.lcv++) |
1465 | { |
1466 | // grab inputs |
1467 | DSP4.in_count = 4; |
1468 | DSP4_WAIT(1); |
1469 | |
1470 | resume1: |
1471 | |
1472 | for (;;) |
1473 | { |
1474 | int16 dist; |
1475 | int16 color, red, green, blue; |
1476 | |
1477 | dist = DSP4_READ_WORD(); |
1478 | color = DSP4_READ_WORD(); |
1479 | |
1480 | // U1+B5+G5+R5 |
1481 | red = color & 0x1f; |
1482 | green = (color >> 5) & 0x1f; |
1483 | blue = (color >> 10) & 0x1f; |
1484 | |
1485 | // dynamic lighting |
1486 | red = (red * dist >> 15) & 0x1f; |
1487 | green = (green * dist >> 15) & 0x1f; |
1488 | blue = (blue * dist >> 15) & 0x1f; |
1489 | color = red | (green << 5) | (blue << 10); |
1490 | |
1491 | DSP4_CLEAR_OUT(); |
1492 | DSP4_WRITE_WORD(color); |
1493 | |
1494 | break; |
1495 | } |
1496 | } |
1497 | |
1498 | ////////////////////////////////////////////////////// |
1499 | |
1500 | // SR = 0x00 |
1501 | |
1502 | // linear interpolation (lerp) between projected points |
1503 | px_dx = (DSP4.view_xofs2 - DSP4.view_xofs1) * DSP4_Inverse(DSP4.segments) << 1; |
1504 | py_dy = (DSP4.view_yofs2 - DSP4.view_yofs1) * DSP4_Inverse(DSP4.segments) << 1; |
1505 | |
1506 | // starting step values |
1507 | x_scroll = SEX16(DSP4.poly_cx[0][0] + DSP4.view_xofs1); |
1508 | y_scroll = SEX16(-DSP4.viewport_bottom + DSP4.view_yofs1 + DSP4.view_yofsenv + DSP4.poly_cx[1][0] - DSP4.world_yofs); |
1509 | |
1510 | // SR = 0x80 |
1511 | |
1512 | // rasterize line |
1513 | for (DSP4.lcv = 0; DSP4.lcv < DSP4.segments; DSP4.lcv++) |
1514 | { |
1515 | // 1. HDMA memory pointer |
1516 | // 2. vertical scroll offset ($210E) |
1517 | // 3. horizontal scroll offset ($210D) |
1518 | DSP4_WRITE_WORD(DSP4.poly_ptr[0][0]); |
1519 | DSP4_WRITE_WORD((y_scroll + 0x8000) >> 16); |
1520 | DSP4_WRITE_WORD((x_scroll + 0x8000) >> 16); |
1521 | |
1522 | // update memory address |
1523 | DSP4.poly_ptr[0][0] -= 4; |
1524 | |
1525 | // update screen values |
1526 | x_scroll += px_dx; |
1527 | y_scroll += py_dy; |
1528 | } |
1529 | } |
1530 | |
1531 | //////////////////////////////////////////////////// |
1532 | // Post-update |
1533 | |
1534 | // update new viewer (x, y, scroll) to last raster line drawn |
1535 | DSP4.view_x1 = DSP4.view_x2; |
1536 | DSP4.view_y1 = DSP4.view_y2; |
1537 | DSP4.view_xofs1 = DSP4.view_xofs2; |
1538 | DSP4.view_yofs1 = DSP4.view_yofs2; |
1539 | |
1540 | // add deltas for projection lines |
1541 | DSP4.world_dx += SEX78(DSP4.world_ddx); |
1542 | DSP4.world_dy += SEX78(DSP4.world_ddy); |
1543 | |
1544 | // update projection lines |
1545 | DSP4.world_x += (DSP4.world_dx + DSP4.world_xenv); |
1546 | DSP4.world_y += DSP4.world_dy; |
1547 | |
1548 | // update road turnoff position |
1549 | DSP4.view_turnoff_x += DSP4.view_turnoff_dx; |
1550 | |
1551 | //////////////////////////////////////////////////// |
1552 | // command check |
1553 | |
1554 | // scan next command |
1555 | DSP4.in_count = 2; |
1556 | DSP4_WAIT(2); |
1557 | |
1558 | resume2: |
1559 | |
1560 | // check for termination |
1561 | DSP4.distance = DSP4_READ_WORD(); |
1562 | if (DSP4.distance == -0x8000) |
1563 | break; |
1564 | |
1565 | // road splice |
1566 | if ((uint16) DSP4.distance == 0x8001) |
1567 | { |
1568 | DSP4.in_count = 6; |
1569 | DSP4_WAIT(3); |
1570 | |
1571 | resume3: |
1572 | |
1573 | DSP4.distance = DSP4_READ_WORD(); |
1574 | DSP4.view_turnoff_x = DSP4_READ_WORD(); |
1575 | DSP4.view_turnoff_dx = DSP4_READ_WORD(); |
1576 | |
1577 | // factor in new changes |
1578 | DSP4.view_x1 += (DSP4.view_turnoff_x * DSP4.distance >> 15); |
1579 | DSP4.view_xofs1 += (DSP4.view_turnoff_x * DSP4.distance >> 15); |
1580 | |
1581 | // update stepping values |
1582 | DSP4.view_turnoff_x += DSP4.view_turnoff_dx; |
1583 | |
1584 | DSP4.in_count = 2; |
1585 | DSP4_WAIT(2); |
1586 | } |
1587 | |
1588 | // already have 2 bytes in queue |
1589 | DSP4.in_count = 6; |
1590 | DSP4_WAIT(4); |
1591 | |
1592 | resume4: |
1593 | |
1594 | // inspect inputs |
1595 | DSP4.world_ddy = DSP4_READ_WORD(); |
1596 | DSP4.world_ddx = DSP4_READ_WORD(); |
1597 | DSP4.view_yofsenv = DSP4_READ_WORD(); |
1598 | |
1599 | // no envelope here |
1600 | DSP4.world_xenv = 0; |
1601 | } |
1602 | while (1); |
1603 | |
1604 | // terminate op |
1605 | DSP4.waiting4command = TRUE; |
1606 | } |
1607 | |
1608 | static void DSP4_OP10 (void) |
1609 | { |
1610 | DSP4.waiting4command = FALSE; |
1611 | |
1612 | // op flow control |
1613 | switch (DSP4.Logic) |
1614 | { |
1615 | case 1: goto resume1; break; |
1616 | case 2: goto resume2; break; |
1617 | case 3: goto resume3; break; |
1618 | } |
1619 | |
1620 | //////////////////////////////////////////////////// |
1621 | // sort inputs |
1622 | |
1623 | DSP4_READ_WORD(); // 0x0000 |
1624 | DSP4.world_y = DSP4_READ_DWORD(); |
1625 | DSP4.poly_bottom[0][0] = DSP4_READ_WORD(); |
1626 | DSP4.poly_top[0][0] = DSP4_READ_WORD(); |
1627 | DSP4.poly_cx[1][0] = DSP4_READ_WORD(); |
1628 | DSP4.viewport_bottom = DSP4_READ_WORD(); |
1629 | DSP4.world_x = DSP4_READ_DWORD(); |
1630 | DSP4.poly_cx[0][0] = DSP4_READ_WORD(); |
1631 | DSP4.poly_ptr[0][0] = DSP4_READ_WORD(); |
1632 | DSP4.world_yofs = DSP4_READ_WORD(); |
1633 | DSP4.distance = DSP4_READ_WORD(); |
1634 | DSP4.view_y2 = DSP4_READ_WORD(); |
1635 | DSP4.view_dy = DSP4_READ_WORD() * DSP4.distance >> 15; |
1636 | DSP4.view_x2 = DSP4_READ_WORD(); |
1637 | DSP4.view_dx = DSP4_READ_WORD() * DSP4.distance >> 15; |
1638 | DSP4.view_yofsenv = DSP4_READ_WORD(); |
1639 | |
1640 | // initial (x, y, offset) at starting raster line |
1641 | DSP4.view_x1 = DSP4.world_x >> 16; |
1642 | DSP4.view_y1 = DSP4.world_y >> 16; |
1643 | DSP4.view_xofs1 = DSP4.view_x1; |
1644 | DSP4.view_yofs1 = DSP4.world_yofs; |
1645 | |
1646 | // first raster line |
1647 | DSP4.poly_raster[0][0] = DSP4.poly_bottom[0][0]; |
1648 | |
1649 | do |
1650 | { |
1651 | //////////////////////////////////////////////////// |
1652 | // process one iteration of projection |
1653 | |
1654 | // add shaping |
1655 | DSP4.view_x2 += DSP4.view_dx; |
1656 | DSP4.view_y2 += DSP4.view_dy; |
1657 | |
1658 | // vertical scroll calculation |
1659 | DSP4.view_xofs2 = DSP4.view_x2; |
1660 | DSP4.view_yofs2 = (DSP4.world_yofs * DSP4.distance >> 15) + DSP4.poly_bottom[0][0] - DSP4.view_y2; |
1661 | |
1662 | // 1. Viewer x-position at the next |
1663 | // 2. Viewer y-position below the horizon |
1664 | // 3. Number of raster lines drawn in this iteration |
1665 | DSP4_CLEAR_OUT(); |
1666 | DSP4_WRITE_WORD(DSP4.view_x2); |
1667 | DSP4_WRITE_WORD(DSP4.view_y2); |
1668 | |
1669 | ////////////////////////////////////////////////////// |
1670 | |
1671 | // SR = 0x00 |
1672 | |
1673 | // determine # of raster lines used |
1674 | DSP4.segments = DSP4.view_y1 - DSP4.view_y2; |
1675 | |
1676 | // prevent overdraw |
1677 | if (DSP4.view_y2 >= DSP4.poly_raster[0][0]) |
1678 | DSP4.segments = 0; |
1679 | else |
1680 | DSP4.poly_raster[0][0] = DSP4.view_y2; |
1681 | |
1682 | // don't draw outside the window |
1683 | if (DSP4.view_y2 < DSP4.poly_top[0][0]) |
1684 | { |
1685 | DSP4.segments = 0; |
1686 | |
1687 | // flush remaining raster lines |
1688 | if (DSP4.view_y1 >= DSP4.poly_top[0][0]) |
1689 | DSP4.segments = DSP4.view_y1 - DSP4.poly_top[0][0]; |
1690 | } |
1691 | |
1692 | // SR = 0x80 |
1693 | |
1694 | DSP4_WRITE_WORD(DSP4.segments); |
1695 | |
1696 | ////////////////////////////////////////////////////// |
1697 | |
1698 | // scan next command if no SR check needed |
1699 | if (DSP4.segments) |
1700 | { |
1701 | for (DSP4.lcv = 0; DSP4.lcv < 4; DSP4.lcv++) |
1702 | { |
1703 | // grab inputs |
1704 | DSP4.in_count = 4; |
1705 | DSP4_WAIT(1); |
1706 | |
1707 | resume1: |
1708 | |
1709 | for (;;) |
1710 | { |
1711 | int16 dist; |
1712 | int16 color, red, green, blue; |
1713 | |
1714 | dist = DSP4_READ_WORD(); |
1715 | color = DSP4_READ_WORD(); |
1716 | |
1717 | // U1+B5+G5+R5 |
1718 | red = color & 0x1f; |
1719 | green = (color >> 5) & 0x1f; |
1720 | blue = (color >> 10) & 0x1f; |
1721 | |
1722 | // dynamic lighting |
1723 | red = (red * dist >> 15) & 0x1f; |
1724 | green = (green * dist >> 15) & 0x1f; |
1725 | blue = (blue * dist >> 15) & 0x1f; |
1726 | color = red | (green << 5) | (blue << 10); |
1727 | |
1728 | DSP4_CLEAR_OUT(); |
1729 | DSP4_WRITE_WORD(color); |
1730 | |
1731 | break; |
1732 | } |
1733 | } |
1734 | } |
1735 | |
1736 | ////////////////////////////////////////////////////// |
1737 | |
1738 | // scan next command if no SR check needed |
1739 | if (DSP4.segments) |
1740 | { |
1741 | int32 px_dx, py_dy; |
1742 | int32 x_scroll, y_scroll; |
1743 | |
1744 | // SR = 0x00 |
1745 | |
1746 | // linear interpolation (lerp) between projected points |
1747 | px_dx = (DSP4.view_xofs2 - DSP4.view_xofs1) * DSP4_Inverse(DSP4.segments) << 1; |
1748 | py_dy = (DSP4.view_yofs2 - DSP4.view_yofs1) * DSP4_Inverse(DSP4.segments) << 1; |
1749 | |
1750 | // starting step values |
1751 | x_scroll = SEX16(DSP4.poly_cx[0][0] + DSP4.view_xofs1); |
1752 | y_scroll = SEX16(-DSP4.viewport_bottom + DSP4.view_yofs1 + DSP4.view_yofsenv + DSP4.poly_cx[1][0] - DSP4.world_yofs); |
1753 | |
1754 | // SR = 0x80 |
1755 | |
1756 | // rasterize line |
1757 | for (DSP4.lcv = 0; DSP4.lcv < DSP4.segments; DSP4.lcv++) |
1758 | { |
1759 | // 1. HDMA memory pointer (bg2) |
1760 | // 2. vertical scroll offset ($2110) |
1761 | // 3. horizontal scroll offset ($210F) |
1762 | DSP4_WRITE_WORD(DSP4.poly_ptr[0][0]); |
1763 | DSP4_WRITE_WORD((y_scroll + 0x8000) >> 16); |
1764 | DSP4_WRITE_WORD((x_scroll + 0x8000) >> 16); |
1765 | |
1766 | // update memory address |
1767 | DSP4.poly_ptr[0][0] -= 4; |
1768 | |
1769 | // update screen values |
1770 | x_scroll += px_dx; |
1771 | y_scroll += py_dy; |
1772 | } |
1773 | } |
1774 | |
1775 | ///////////////////////////////////////////////////// |
1776 | // Post-update |
1777 | |
1778 | // update new viewer (x, y, scroll) to last raster line drawn |
1779 | DSP4.view_x1 = DSP4.view_x2; |
1780 | DSP4.view_y1 = DSP4.view_y2; |
1781 | DSP4.view_xofs1 = DSP4.view_xofs2; |
1782 | DSP4.view_yofs1 = DSP4.view_yofs2; |
1783 | |
1784 | //////////////////////////////////////////////////// |
1785 | // command check |
1786 | |
1787 | // scan next command |
1788 | DSP4.in_count = 2; |
1789 | DSP4_WAIT(2); |
1790 | |
1791 | resume2: |
1792 | |
1793 | // check for opcode termination |
1794 | DSP4.distance = DSP4_READ_WORD(); |
1795 | if (DSP4.distance == -0x8000) |
1796 | break; |
1797 | |
1798 | // already have 2 bytes in queue |
1799 | DSP4.in_count = 10; |
1800 | DSP4_WAIT(3); |
1801 | |
1802 | resume3: |
1803 | |
1804 | // inspect inputs |
1805 | DSP4.view_y2 = DSP4_READ_WORD(); |
1806 | DSP4.view_dy = DSP4_READ_WORD() * DSP4.distance >> 15; |
1807 | DSP4.view_x2 = DSP4_READ_WORD(); |
1808 | DSP4.view_dx = DSP4_READ_WORD() * DSP4.distance >> 15; |
1809 | } |
1810 | while (1); |
1811 | |
1812 | DSP4.waiting4command = TRUE; |
1813 | } |
1814 | |
1815 | static void DSP4_OP11 (int16 A, int16 B, int16 C, int16 D, int16 *M) |
1816 | { |
1817 | // 0x155 = 341 = Horizontal Width of the Screen |
1818 | *M = ((A * 0x0155 >> 2) & 0xf000) | ((B * 0x0155 >> 6) & 0x0f00) | ((C * 0x0155 >> 10) & 0x00f0) | ((D * 0x0155 >> 14) & 0x000f); |
1819 | } |
1820 | |
1821 | static void DSP4_SetByte (void) |
1822 | { |
1823 | // clear pending read |
1824 | if (DSP4.out_index < DSP4.out_count) |
1825 | { |
1826 | DSP4.out_index++; |
1827 | return; |
1828 | } |
1829 | |
1830 | if (DSP4.waiting4command) |
1831 | { |
1832 | if (DSP4.half_command) |
1833 | { |
1834 | DSP4.command |= (DSP4.byte << 8); |
1835 | DSP4.in_index = 0; |
1836 | DSP4.waiting4command = FALSE; |
1837 | DSP4.half_command = FALSE; |
1838 | DSP4.out_count = 0; |
1839 | DSP4.out_index = 0; |
1840 | |
1841 | DSP4.Logic = 0; |
1842 | |
1843 | switch (DSP4.command) |
1844 | { |
1845 | case 0x0000: DSP4.in_count = 4; break; |
1846 | case 0x0001: DSP4.in_count = 44; break; |
1847 | case 0x0003: DSP4.in_count = 0; break; |
1848 | case 0x0005: DSP4.in_count = 0; break; |
1849 | case 0x0006: DSP4.in_count = 0; break; |
1850 | case 0x0007: DSP4.in_count = 34; break; |
1851 | case 0x0008: DSP4.in_count = 90; break; |
1852 | case 0x0009: DSP4.in_count = 14; break; |
1853 | case 0x000a: DSP4.in_count = 6; break; |
1854 | case 0x000b: DSP4.in_count = 6; break; |
1855 | case 0x000d: DSP4.in_count = 42; break; |
1856 | case 0x000e: DSP4.in_count = 0; break; |
1857 | case 0x000f: DSP4.in_count = 46; break; |
1858 | case 0x0010: DSP4.in_count = 36; break; |
1859 | case 0x0011: DSP4.in_count = 8; break; |
1860 | default: |
1861 | DSP4.waiting4command = TRUE; |
1862 | break; |
1863 | } |
1864 | } |
1865 | else |
1866 | { |
1867 | DSP4.command = DSP4.byte; |
1868 | DSP4.half_command = TRUE; |
1869 | } |
1870 | } |
1871 | else |
1872 | { |
1873 | DSP4.parameters[DSP4.in_index] = DSP4.byte; |
1874 | DSP4.in_index++; |
1875 | } |
1876 | |
1877 | if (!DSP4.waiting4command && DSP4.in_count == DSP4.in_index) |
1878 | { |
1879 | // Actually execute the command |
1880 | DSP4.waiting4command = TRUE; |
1881 | DSP4.out_index = 0; |
1882 | DSP4.in_index = 0; |
1883 | |
1884 | switch (DSP4.command) |
1885 | { |
1886 | // 16-bit multiplication |
1887 | case 0x0000: |
1888 | { |
1889 | int16 multiplier, multiplicand; |
1890 | int32 product; |
1891 | |
1892 | multiplier = DSP4_READ_WORD(); |
1893 | multiplicand = DSP4_READ_WORD(); |
1894 | |
1895 | DSP4_Multiply(multiplicand, multiplier, &product); |
1896 | |
1897 | DSP4_CLEAR_OUT(); |
1898 | DSP4_WRITE_WORD(product); |
1899 | DSP4_WRITE_WORD(product >> 16); |
1900 | |
1901 | break; |
1902 | } |
1903 | |
1904 | // single-player track projection |
1905 | case 0x0001: |
1906 | DSP4_OP01(); |
1907 | break; |
1908 | |
1909 | // single-player selection |
1910 | case 0x0003: |
1911 | DSP4_OP03(); |
1912 | break; |
1913 | |
1914 | // clear OAM |
1915 | case 0x0005: |
1916 | DSP4_OP05(); |
1917 | break; |
1918 | |
1919 | // transfer OAM |
1920 | case 0x0006: |
1921 | DSP4_OP06(); |
1922 | break; |
1923 | |
1924 | // single-player track turnoff projection |
1925 | case 0x0007: |
1926 | DSP4_OP07(); |
1927 | break; |
1928 | |
1929 | // solid polygon projection |
1930 | case 0x0008: |
1931 | DSP4_OP08(); |
1932 | break; |
1933 | |
1934 | // sprite projection |
1935 | case 0x0009: |
1936 | DSP4_OP09(); |
1937 | break; |
1938 | |
1939 | // unknown |
1940 | case 0x000A: |
1941 | { |
1942 | DSP4_READ_WORD(); |
1943 | int16 in2a = DSP4_READ_WORD(); |
1944 | DSP4_READ_WORD(); |
1945 | int16 out1a, out2a, out3a, out4a; |
1946 | |
1947 | DSP4_OP0A(in2a, &out2a, &out1a, &out4a, &out3a); |
1948 | |
1949 | DSP4_CLEAR_OUT(); |
1950 | DSP4_WRITE_WORD(out1a); |
1951 | DSP4_WRITE_WORD(out2a); |
1952 | DSP4_WRITE_WORD(out3a); |
1953 | DSP4_WRITE_WORD(out4a); |
1954 | |
1955 | break; |
1956 | } |
1957 | |
1958 | // set OAM |
1959 | case 0x000B: |
1960 | { |
1961 | int16 sp_x = DSP4_READ_WORD(); |
1962 | int16 sp_y = DSP4_READ_WORD(); |
1963 | int16 sp_attr = DSP4_READ_WORD(); |
1964 | bool8 draw = TRUE; |
1965 | |
1966 | DSP4_CLEAR_OUT(); |
1967 | DSP4_OP0B(&draw, sp_x, sp_y, sp_attr, 0, 1); |
1968 | |
1969 | break; |
1970 | } |
1971 | |
1972 | // multi-player track projection |
1973 | case 0x000D: |
1974 | DSP4_OP0D(); |
1975 | break; |
1976 | |
1977 | // multi-player selection |
1978 | case 0x000E: |
1979 | DSP4_OP0E(); |
1980 | break; |
1981 | |
1982 | // single-player track projection with lighting |
1983 | case 0x000F: |
1984 | DSP4_OP0F(); |
1985 | break; |
1986 | |
1987 | // single-player track turnoff projection with lighting |
1988 | case 0x0010: |
1989 | DSP4_OP10(); |
1990 | break; |
1991 | |
1992 | // unknown: horizontal mapping command |
1993 | case 0x0011: |
1994 | { |
1995 | int16 a, b, c, d, m; |
1996 | |
1997 | d = DSP4_READ_WORD(); |
1998 | c = DSP4_READ_WORD(); |
1999 | b = DSP4_READ_WORD(); |
2000 | a = DSP4_READ_WORD(); |
2001 | |
2002 | DSP4_OP11(a, b, c, d, &m); |
2003 | |
2004 | DSP4_CLEAR_OUT(); |
2005 | DSP4_WRITE_WORD(m); |
2006 | |
2007 | break; |
2008 | } |
2009 | |
2010 | default: |
2011 | break; |
2012 | } |
2013 | } |
2014 | } |
2015 | |
2016 | static void DSP4_GetByte (void) |
2017 | { |
2018 | if (DSP4.out_count) |
2019 | { |
2020 | DSP4.byte = (uint8) DSP4.output[DSP4.out_index & 0x1FF]; |
2021 | |
2022 | DSP4.out_index++; |
2023 | if (DSP4.out_count == DSP4.out_index) |
2024 | DSP4.out_count = 0; |
2025 | } |
2026 | else |
2027 | DSP4.byte = 0xff; |
2028 | } |
2029 | |
2030 | void DSP4SetByte (uint8 byte, uint16 address) |
2031 | { |
2032 | if (address < DSP0.boundary) |
2033 | { |
2034 | DSP4.byte = byte; |
2035 | DSP4.address = address; |
2036 | DSP4_SetByte(); |
2037 | } |
2038 | } |
2039 | |
2040 | uint8 DSP4GetByte (uint16 address) |
2041 | { |
2042 | if (address < DSP0.boundary) |
2043 | { |
2044 | DSP4.address = address; |
2045 | DSP4_GetByte(); |
2046 | return (DSP4.byte); |
2047 | } |
2048 | |
2049 | return (0x80); |
2050 | } |
2051 | |