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new timing for main and cd
[picodrive.git] / pico / videoport.c
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1/*\r
2 * PicoDrive\r
3 * (c) Copyright Dave, 2004\r
4 * (C) notaz, 2006-2009\r
5 *\r
6 * This work is licensed under the terms of MAME license.\r
7 * See COPYING file in the top-level directory.\r
8 */\r
9\r
10#include "pico_int.h"\r
11#include "cd/gfx_cd.h"\r
12\r
13extern const unsigned char hcounts_32[];\r
14extern const unsigned char hcounts_40[];\r
15\r
16#ifndef UTYPES_DEFINED\r
17typedef unsigned char u8;\r
18typedef unsigned short u16;\r
19typedef unsigned int u32;\r
20#define UTYPES_DEFINED\r
21#endif\r
22\r
23int (*PicoDmaHook)(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp) = NULL;\r
24\r
25static __inline void AutoIncrement(void)\r
26{\r
27 Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);\r
28}\r
29\r
30static void VideoWrite(u16 d)\r
31{\r
32 unsigned int a=Pico.video.addr;\r
33\r
34 switch (Pico.video.type)\r
35 {\r
36 case 1: if(a&1) d=(u16)((d<<8)|(d>>8)); // If address is odd, bytes are swapped (which game needs this?)\r
37 Pico.vram [(a>>1)&0x7fff]=d;\r
38 if (a - ((unsigned)(Pico.video.reg[5]&0x7f) << 9) < 0x400)\r
39 rendstatus |= PDRAW_DIRTY_SPRITES;\r
40 break;\r
41 case 3: Pico.m.dirtyPal = 1;\r
42 Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)\r
43 case 5: Pico.vsram[(a>>1)&0x003f]=d; break;\r
44 //default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;\r
45 }\r
46\r
47 AutoIncrement();\r
48}\r
49\r
50static unsigned int VideoRead(void)\r
51{\r
52 unsigned int a=0,d=0;\r
53\r
54 a=Pico.video.addr; a>>=1;\r
55\r
56 switch (Pico.video.type)\r
57 {\r
58 case 0: d=Pico.vram [a&0x7fff]; break;\r
59 case 8: d=Pico.cram [a&0x003f]; break;\r
60 case 4: d=Pico.vsram[a&0x003f]; break;\r
61 default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;\r
62 }\r
63\r
64 AutoIncrement();\r
65 return d;\r
66}\r
67\r
68static int GetDmaLength(void)\r
69{\r
70 struct PicoVideo *pvid=&Pico.video;\r
71 int len=0;\r
72 // 16-bit words to transfer:\r
73 len =pvid->reg[0x13];\r
74 len|=pvid->reg[0x14]<<8;\r
75 // Charles MacDonald:\r
76 if(!len) len = 0xffff;\r
77 return len;\r
78}\r
79\r
80static void DmaSlow(int len)\r
81{\r
82 u16 *pd=0, *pdend, *r;\r
83 unsigned int a=Pico.video.addr, a2, d;\r
84 unsigned char inc=Pico.video.reg[0xf];\r
85 unsigned int source;\r
86\r
87 source =Pico.video.reg[0x15]<<1;\r
88 source|=Pico.video.reg[0x16]<<9;\r
89 source|=Pico.video.reg[0x17]<<17;\r
90\r
91 elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i] @ %06x",\r
92 Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),\r
93 SekCyclesDone(), SekPc);\r
94\r
95 Pico.m.dma_xfers += len;\r
96 SekCyclesBurnRun(CheckDMA());\r
97\r
98 if ((source&0xe00000)==0xe00000) { // Ram\r
99 pd=(u16 *)(Pico.ram+(source&0xfffe));\r
100 pdend=(u16 *)(Pico.ram+0x10000);\r
101 }\r
102 else if (PicoAHW & PAHW_MCD)\r
103 {\r
104 elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);\r
105 if(source<0x20000) { // Bios area\r
106 pd=(u16 *)(Pico_mcd->bios+(source&~1));\r
107 pdend=(u16 *)(Pico_mcd->bios+0x20000);\r
108 } else if ((source&0xfc0000)==0x200000) { // Word Ram\r
109 source -= 2;\r
110 if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode\r
111 pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));\r
112 pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);\r
113 } else {\r
114 if (source < 0x220000) { // 1M mode\r
115 int bank = Pico_mcd->s68k_regs[3]&1;\r
116 pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));\r
117 pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);\r
118 } else {\r
119 DmaSlowCell(source, a, len, inc);\r
120 return;\r
121 }\r
122 }\r
123 } else if ((source&0xfe0000)==0x020000) { // Prg Ram\r
124 u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
125 pd=(u16 *)(prg_ram+(source&0x1fffe));\r
126 pdend=(u16 *)(prg_ram+0x20000);\r
127 } else {\r
128 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: FIXME: unsupported src", Pico.video.type, source, a);\r
129 return;\r
130 }\r
131 }\r
132 else\r
133 {\r
134 // if we have DmaHook, let it handle ROM because of possible DMA delay\r
135 if (PicoDmaHook && PicoDmaHook(source, len, &pd, &pdend));\r
136 else if (source<Pico.romsize) { // Rom\r
137 pd=(u16 *)(Pico.rom+(source&~1));\r
138 pdend=(u16 *)(Pico.rom+Pico.romsize);\r
139 }\r
140 else {\r
141 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);\r
142 return;\r
143 }\r
144 }\r
145\r
146 // overflow protection, might break something..\r
147 if (len > pdend - pd) {\r
148 len = pdend - pd;\r
149 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow overflow");\r
150 }\r
151\r
152 switch (Pico.video.type)\r
153 {\r
154 case 1: // vram\r
155 r = Pico.vram;\r
156 if (inc == 2 && !(a&1) && a+len*2 < 0x10000)\r
157 {\r
158 // most used DMA mode\r
159 memcpy16(r + (a>>1), pd, len);\r
160 a += len*2;\r
161 }\r
162 else\r
163 {\r
164 for(; len; len--)\r
165 {\r
166 d=*pd++;\r
167 if(a&1) d=(d<<8)|(d>>8);\r
168 r[a>>1] = (u16)d; // will drop the upper bits\r
169 // AutoIncrement\r
170 a=(u16)(a+inc);\r
171 // didn't src overlap?\r
172 //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM\r
173 }\r
174 }\r
175 rendstatus |= PDRAW_DIRTY_SPRITES;\r
176 break;\r
177\r
178 case 3: // cram\r
179 Pico.m.dirtyPal = 1;\r
180 r = Pico.cram;\r
181 for(a2=a&0x7f; len; len--)\r
182 {\r
183 r[a2>>1] = (u16)*pd++; // bit 0 is ignored\r
184 // AutoIncrement\r
185 a2+=inc;\r
186 // didn't src overlap?\r
187 //if(pd >= pdend) pd-=0x8000;\r
188 // good dest?\r
189 if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis\r
190 }\r
191 a=(a&0xff00)|a2;\r
192 break;\r
193\r
194 case 5: // vsram[a&0x003f]=d;\r
195 r = Pico.vsram;\r
196 for(a2=a&0x7f; len; len--)\r
197 {\r
198 r[a2>>1] = (u16)*pd++;\r
199 // AutoIncrement\r
200 a2+=inc;\r
201 // didn't src overlap?\r
202 //if(pd >= pdend) pd-=0x8000;\r
203 // good dest?\r
204 if(a2 >= 0x80) break;\r
205 }\r
206 a=(a&0xff00)|a2;\r
207 break;\r
208\r
209 default:\r
210 if (Pico.video.type != 0 || (EL_LOGMASK & EL_VDPDMA))\r
211 elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);\r
212 break;\r
213 }\r
214 // remember addr\r
215 Pico.video.addr=(u16)a;\r
216}\r
217\r
218static void DmaCopy(int len)\r
219{\r
220 u16 a=Pico.video.addr;\r
221 unsigned char *vr = (unsigned char *) Pico.vram;\r
222 unsigned char *vrs;\r
223 unsigned char inc=Pico.video.reg[0xf];\r
224 int source;\r
225 elprintf(EL_VDPDMA, "DmaCopy len %i [%i]", len, SekCyclesDone());\r
226\r
227 Pico.m.dma_xfers += len;\r
228 Pico.video.status |= 2; // dma busy\r
229\r
230 source =Pico.video.reg[0x15];\r
231 source|=Pico.video.reg[0x16]<<8;\r
232 vrs=vr+source;\r
233\r
234 if (source+len > 0x10000) len=0x10000-source; // clip??\r
235\r
236 for (; len; len--)\r
237 {\r
238 vr[a] = *vrs++;\r
239 // AutoIncrement\r
240 a=(u16)(a+inc);\r
241 }\r
242 // remember addr\r
243 Pico.video.addr=a;\r
244 rendstatus |= PDRAW_DIRTY_SPRITES;\r
245}\r
246\r
247// check: Contra, Megaman\r
248// note: this is still inaccurate\r
249static void DmaFill(int data)\r
250{\r
251 int len;\r
252 unsigned short a=Pico.video.addr;\r
253 unsigned char *vr=(unsigned char *) Pico.vram;\r
254 unsigned char high = (unsigned char) (data >> 8);\r
255 unsigned char inc=Pico.video.reg[0xf];\r
256\r
257 len=GetDmaLength();\r
258 elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%i]", len, inc, SekCyclesDone());\r
259\r
260 Pico.m.dma_xfers += len;\r
261 Pico.video.status |= 2; // dma busy\r
262\r
263 // from Charles MacDonald's genvdp.txt:\r
264 // Write lower byte to address specified\r
265 vr[a] = (unsigned char) data;\r
266 a=(u16)(a+inc);\r
267\r
268 if (!inc) len=1;\r
269\r
270 for (; len; len--) {\r
271 // Write upper byte to adjacent address\r
272 // (here we are byteswapped, so address is already 'adjacent')\r
273 vr[a] = high;\r
274\r
275 // Increment address register\r
276 a=(u16)(a+inc);\r
277 }\r
278 // remember addr\r
279 Pico.video.addr=a;\r
280 // update length\r
281 Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)\r
282\r
283 rendstatus |= PDRAW_DIRTY_SPRITES;\r
284}\r
285\r
286static void CommandDma(void)\r
287{\r
288 struct PicoVideo *pvid=&Pico.video;\r
289 int len=0,method=0;\r
290\r
291 if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled\r
292\r
293 len=GetDmaLength();\r
294\r
295 method=pvid->reg[0x17]>>6;\r
296 if (method< 2) DmaSlow(len); // 68000 to VDP\r
297 if (method==3) DmaCopy(len); // VRAM Copy\r
298}\r
299\r
300static void CommandChange(void)\r
301{\r
302 struct PicoVideo *pvid=&Pico.video;\r
303 unsigned int cmd=0,addr=0;\r
304\r
305 cmd=pvid->command;\r
306\r
307 // Get type of transfer 0xc0000030 (v/c/vsram read/write)\r
308 pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));\r
309\r
310 // Get address 0x3fff0003\r
311 addr =(cmd>>16)&0x3fff;\r
312 addr|=(cmd<<14)&0xc000;\r
313 pvid->addr=(unsigned short)addr;\r
314\r
315 // Check for dma:\r
316 if (cmd&0x80) CommandDma();\r
317}\r
318\r
319static void DrawSync(int blank_on)\r
320{\r
321 if (Pico.m.scanline < 224 && !(PicoOpt & POPT_ALT_RENDERER) &&\r
322 !PicoSkipFrame && DrawScanline <= Pico.m.scanline) {\r
323 //elprintf(EL_ANOMALY, "sync");\r
324 PicoDrawSync(Pico.m.scanline, blank_on);\r
325 }\r
326}\r
327\r
328PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)\r
329{\r
330 struct PicoVideo *pvid=&Pico.video;\r
331\r
332 //if (Pico.m.scanline < 224)\r
333 // elprintf(EL_STATUS, "PicoVideoWrite [%06x] %04x", a, d);\r
334 a&=0x1c;\r
335\r
336 if (a==0x00) // Data port 0 or 2\r
337 {\r
338 // try avoiding the sync..\r
339 if (Pico.m.scanline < 224 && (pvid->reg[1]&0x40) &&\r
340 !(!pvid->pending &&\r
341 ((pvid->command & 0xc00000f0) == 0x40000010 && Pico.vsram[pvid->addr>>1] == d))\r
342 )\r
343 DrawSync(0);\r
344\r
345 if (pvid->pending) {\r
346 CommandChange();\r
347 pvid->pending=0;\r
348 }\r
349\r
350 // If a DMA fill has been set up, do it\r
351 if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)\r
352 {\r
353 DmaFill(d);\r
354 }\r
355 else\r
356 {\r
357 // preliminary FIFO emulation for Chaos Engine, The (E)\r
358 if (!(pvid->status&8) && (pvid->reg[1]&0x40) && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display?\r
359 {\r
360 pvid->status&=~0x200; // FIFO no longer empty\r
361 pvid->lwrite_cnt++;\r
362 if (pvid->lwrite_cnt >= 4) pvid->status|=0x100; // FIFO full\r
363 if (pvid->lwrite_cnt > 4) {\r
364 SekCyclesBurnRun(32); // penalty // 488/12-8\r
365 }\r
366 elprintf(EL_ASVDP, "VDP data write: %04x [%06x] {%i} #%i @ %06x", d, Pico.video.addr,\r
367 Pico.video.type, pvid->lwrite_cnt, SekPc);\r
368 }\r
369 VideoWrite(d);\r
370 }\r
371 return;\r
372 }\r
373\r
374 if (a==0x04) // Control (command) port 4 or 6\r
375 {\r
376 if (pvid->pending)\r
377 {\r
378 if (d & 0x80) DrawSync(0); // only need sync for DMA\r
379 // Low word of command:\r
380 pvid->command&=0xffff0000;\r
381 pvid->command|=d;\r
382 pvid->pending=0;\r
383 CommandChange();\r
384 }\r
385 else\r
386 {\r
387 if ((d&0xc000)==0x8000)\r
388 {\r
389 // Register write:\r
390 int num=(d>>8)&0x1f;\r
391 int dold=pvid->reg[num];\r
392 int blank_on = 0;\r
393 pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)\r
394 if (num > 0x0a && !(pvid->reg[1]&4)) {\r
395 elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);\r
396 return;\r
397 }\r
398\r
399 if (num == 1 && !(d&0x40) && SekCyclesLeft > 390) blank_on = 1;\r
400 DrawSync(blank_on);\r
401 pvid->reg[num]=(unsigned char)d;\r
402 switch (num)\r
403 {\r
404 case 0x00:\r
405 elprintf(EL_INTSW, "hint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x10)>>4,\r
406 (d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);\r
407 goto update_irq;\r
408 case 0x01:\r
409 elprintf(EL_INTSW, "vint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x20)>>5,\r
410 (d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);\r
411 goto update_irq;\r
412 case 0x05:\r
413 //elprintf(EL_STATUS, "spritep moved to %04x", (unsigned)(Pico.video.reg[5]&0x7f) << 9);\r
414 if (d^dold) rendstatus |= PDRAW_SPRITES_MOVED;\r
415 break;\r
416 case 0x0c:\r
417 // renderers should update their palettes if sh/hi mode is changed\r
418 if ((d^dold)&8) Pico.m.dirtyPal = 2;\r
419 break;\r
420 }\r
421 return;\r
422\r
423update_irq:\r
424#ifndef EMU_CORE_DEBUG\r
425 // update IRQ level\r
426 if (!SekShouldInterrupt) // hack\r
427 {\r
428 int lines, pints, irq=0;\r
429 lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);\r
430 pints = (pvid->pending_ints&lines);\r
431 if (pints & 0x20) irq = 6;\r
432 else if (pints & 0x10) irq = 4;\r
433 SekInterrupt(irq); // update line\r
434\r
435 if (irq) SekEndRun(24); // make it delayed\r
436 }\r
437#endif\r
438 }\r
439 else\r
440 {\r
441 // High word of command:\r
442 pvid->command&=0x0000ffff;\r
443 pvid->command|=d<<16;\r
444 pvid->pending=1;\r
445 }\r
446 }\r
447 }\r
448}\r
449\r
450PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)\r
451{\r
452 a&=0x1c;\r
453\r
454 if (a==0x04) // control port\r
455 {\r
456 struct PicoVideo *pv=&Pico.video;\r
457 unsigned int d;\r
458 d=pv->status;\r
459 //if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)\r
460 if (SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs)\r
461\r
462 d |= ((pv->reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled\r
463 d |= (pv->pending_ints&0x20)<<2; // V-int pending?\r
464 if (d&0x100) pv->status&=~0x100; // FIFO no longer full\r
465\r
466 pv->pending = 0; // ctrl port reads clear write-pending flag (Charles MacDonald)\r
467\r
468 elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc);\r
469 return d;\r
470 }\r
471\r
472 // H-counter info (based on Generator):\r
473 // frame:\r
474 // | <- hblank? -> |\r
475 // start <416> hint <36> hdisplay <38> end // CPU cycles\r
476 // |---------...---------|------------|-------------|\r
477 // 0 B6 E4 FF // 40 cells\r
478 // 0 93 E8 FF // 32 cells\r
479\r
480 // Gens (?) v-render\r
481 // start <hblank=84> hint hdisplay <404> |\r
482 // |---------------------|--------------------------|\r
483 // E4 (hc[0x43]==0) 07 B1 // 40\r
484 // E8 (hc[0x45]==0) 05 91 // 32\r
485\r
486 // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune\r
487 if ((a&0x1c)==0x08)\r
488 {\r
489 unsigned int d;\r
490 int lineCycles;\r
491\r
492 lineCycles = (488-SekCyclesLeft)&0x1ff;\r
493 if (Pico.video.reg[12]&1)\r
494 d = hcounts_40[lineCycles];\r
495 else d = hcounts_32[lineCycles];\r
496\r
497 elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc);\r
498 return d | (Pico.video.v_counter << 8);\r
499 }\r
500\r
501 if (a==0x00) // data port\r
502 {\r
503 return VideoRead();\r
504 }\r
505\r
506 return 0;\r
507}\r
508\r
509unsigned int PicoVideoRead8(unsigned int a)\r
510{\r
511 unsigned int d;\r
512 a&=0x1d;\r
513\r
514 switch (a)\r
515 {\r
516 case 0: return VideoRead() >> 8;\r
517 case 1: return VideoRead() & 0xff;\r
518 case 4: // control port/status reg\r
519 d = Pico.video.status >> 8;\r
520 if (d&1) Pico.video.status&=~0x100; // FIFO no longer full\r
521 Pico.video.pending = 0;\r
522 elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);\r
523 return d;\r
524 case 5:\r
525 d = Pico.video.status & 0xff;\r
526 //if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)\r
527 d |= ((Pico.video.reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled\r
528 d |= (Pico.video.pending_ints&0x20)<<2; // V-int pending?\r
529 if (SekCyclesLeft < 84+4) d |= 4; // H-Blank\r
530 Pico.video.pending = 0;\r
531 elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);\r
532 return d;\r
533 case 8: // hv counter\r
534 elprintf(EL_HVCNT, "vcounter: %02x (%i) @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc);\r
535 return Pico.video.v_counter;\r
536 case 9:\r
537 d = (488-SekCyclesLeft)&0x1ff;\r
538 if (Pico.video.reg[12]&1)\r
539 d = hcounts_40[d];\r
540 else d = hcounts_32[d];\r
541 elprintf(EL_HVCNT, "hcounter: %02x (%i) @ %06x", d, SekCyclesDone(), SekPc);\r
542 return d;\r
543 }\r
544\r
545 return 0;\r
546}\r
547\r
548// vim:shiftwidth=2:ts=2:expandtab\r
fast MegaDrive/MegaCD/32X emulator