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1// This is part of Pico Library\r
2\r
3// (c) Copyright 2004 Dave, All rights reserved.\r
4// (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas\r
5// Free for non-commercial use.\r
6\r
7// For commercial use, separate licencing terms must be obtained.\r
8\r
9\r
10#include "PicoInt.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
15extern const unsigned short vcounts[];\r
16extern int rendstatus;\r
17\r
18#ifndef UTYPES_DEFINED\r
19typedef unsigned char u8;\r
20typedef unsigned short u16;\r
21typedef unsigned int u32;\r
22#define UTYPES_DEFINED\r
23#endif\r
24\r
25int (*PicoDmaHook)(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp) = NULL;\r
26\r
27static __inline void AutoIncrement(void)\r
28{\r
29 Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);\r
30}\r
31\r
32static void VideoWrite(u16 d)\r
33{\r
34 unsigned int a=Pico.video.addr;\r
35\r
36 switch (Pico.video.type)\r
37 {\r
38 case 1: if(a&1) d=(u16)((d<<8)|(d>>8)); // If address is odd, bytes are swapped (which game needs this?)\r
39 Pico.vram [(a>>1)&0x7fff]=d;\r
40 rendstatus|=0x10; 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 //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());\r
48 AutoIncrement();\r
49}\r
50\r
51static unsigned int VideoRead(void)\r
52{\r
53 unsigned int a=0,d=0;\r
54\r
55 a=Pico.video.addr; a>>=1;\r
56\r
57 switch (Pico.video.type)\r
58 {\r
59 case 0: d=Pico.vram [a&0x7fff]; break;\r
60 case 8: d=Pico.cram [a&0x003f]; break;\r
61 case 4: d=Pico.vsram[a&0x003f]; break;\r
62 default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;\r
63 }\r
64\r
65 AutoIncrement();\r
66 return d;\r
67}\r
68\r
69static int GetDmaLength(void)\r
70{\r
71 struct PicoVideo *pvid=&Pico.video;\r
72 int len=0;\r
73 // 16-bit words to transfer:\r
74 len =pvid->reg[0x13];\r
75 len|=pvid->reg[0x14]<<8;\r
76 // Charles MacDonald:\r
77 if(!len) len = 0xffff;\r
78 return len;\r
79}\r
80\r
81static void DmaSlow(int len)\r
82{\r
83 u16 *pd=0, *pdend, *r;\r
84 unsigned int a=Pico.video.addr, a2, d;\r
85 unsigned char inc=Pico.video.reg[0xf];\r
86 unsigned int source;\r
87\r
88 source =Pico.video.reg[0x15]<<1;\r
89 source|=Pico.video.reg[0x16]<<9;\r
90 source|=Pico.video.reg[0x17]<<17;\r
91\r
92 elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i] @ %06x",\r
93 Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),\r
94 SekCyclesDone(), SekPc);\r
95\r
96 if(Pico.m.scanline != -1) {\r
97 Pico.m.dma_xfers += len;\r
98 if ((PicoMCD&1) && (PicoOpt & 0x2000)) SekCyclesBurn(CheckDMA());\r
99 else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());\r
100 } else {\r
101 // be approximate in non-accurate mode\r
102 SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));\r
103 }\r
104\r
105 if ((source&0xe00000)==0xe00000) { // Ram\r
106 pd=(u16 *)(Pico.ram+(source&0xfffe));\r
107 pdend=(u16 *)(Pico.ram+0x10000);\r
108 } else if (PicoMCD & 1) {\r
109 elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);\r
110 if(source<0x20000) { // Bios area\r
111 pd=(u16 *)(Pico_mcd->bios+(source&~1));\r
112 pdend=(u16 *)(Pico_mcd->bios+0x20000);\r
113 } else if ((source&0xfc0000)==0x200000) { // Word Ram\r
114 source -= 2;\r
115 if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode\r
116 pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));\r
117 pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);\r
118 } else {\r
119 if (source < 0x220000) { // 1M mode\r
120 int bank = Pico_mcd->s68k_regs[3]&1;\r
121 pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));\r
122 pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);\r
123 } else {\r
124 DmaSlowCell(source, a, len, inc);\r
125 return;\r
126 }\r
127 }\r
128 } else if ((source&0xfe0000)==0x020000) { // Prg Ram\r
129 u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
130 pd=(u16 *)(prg_ram+(source&0x1fffe));\r
131 pdend=(u16 *)(prg_ram+0x20000);\r
132 } else {\r
133 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: FIXME: unsupported src", Pico.video.type, source, a);\r
134 return;\r
135 }\r
136 } else {\r
137 // if we have DmaHook, let it handle ROM because of possible DMA delay\r
138 if (PicoDmaHook && PicoDmaHook(source, len, &pd, &pdend));\r
139 else if (source<Pico.romsize) { // Rom\r
140 pd=(u16 *)(Pico.rom+(source&~1));\r
141 pdend=(u16 *)(Pico.rom+Pico.romsize);\r
142 }\r
143 else {\r
144 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);\r
145 return;\r
146 }\r
147 }\r
148\r
149 // overflow protection, might break something..\r
150 if (len > pdend - pd) {\r
151 len = pdend - pd;\r
152 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow overflow");\r
153 }\r
154\r
155 switch (Pico.video.type)\r
156 {\r
157 case 1: // vram\r
158 r = Pico.vram;\r
159 if (inc == 2 && !(a&1) && a+len*2 < 0x10000)\r
160 {\r
161 // most used DMA mode\r
162 memcpy16(r + (a>>1), pd, len);\r
163 a += len*2;\r
164 }\r
165 else\r
166 {\r
167 for(; len; len--)\r
168 {\r
169 d=*pd++;\r
170 if(a&1) d=(d<<8)|(d>>8);\r
171 r[a>>1] = (u16)d; // will drop the upper bits\r
172 // AutoIncrement\r
173 a=(u16)(a+inc);\r
174 // didn't src overlap?\r
175 //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM\r
176 }\r
177 }\r
178 rendstatus|=0x10;\r
179 break;\r
180\r
181 case 3: // cram\r
182 Pico.m.dirtyPal = 1;\r
183 r = Pico.cram;\r
184 for(a2=a&0x7f; len; len--)\r
185 {\r
186 r[a2>>1] = (u16)*pd++; // bit 0 is ignored\r
187 // AutoIncrement\r
188 a2+=inc;\r
189 // didn't src overlap?\r
190 //if(pd >= pdend) pd-=0x8000;\r
191 // good dest?\r
192 if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis\r
193 }\r
194 a=(a&0xff00)|a2;\r
195 break;\r
196\r
197 case 5: // vsram[a&0x003f]=d;\r
198 r = Pico.vsram;\r
199 for(a2=a&0x7f; len; len--)\r
200 {\r
201 r[a2>>1] = (u16)*pd++;\r
202 // AutoIncrement\r
203 a2+=inc;\r
204 // didn't src overlap?\r
205 //if(pd >= pdend) pd-=0x8000;\r
206 // good dest?\r
207 if(a2 >= 0x80) break;\r
208 }\r
209 a=(a&0xff00)|a2;\r
210 break;\r
211\r
212 default:\r
213 elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);\r
214 break;\r
215 }\r
216 // remember addr\r
217 Pico.video.addr=(u16)a;\r
218}\r
219\r
220static void DmaCopy(int len)\r
221{\r
222 u16 a=Pico.video.addr;\r
223 unsigned char *vr = (unsigned char *) Pico.vram;\r
224 unsigned char *vrs;\r
225 unsigned char inc=Pico.video.reg[0xf];\r
226 int source;\r
227 elprintf(EL_VDPDMA, "DmaCopy len %i [%i]", len, SekCyclesDone());\r
228\r
229 Pico.m.dma_xfers += len;\r
230 if(Pico.m.scanline != -1)\r
231 Pico.video.status|=2; // dma busy\r
232\r
233 source =Pico.video.reg[0x15];\r
234 source|=Pico.video.reg[0x16]<<8;\r
235 vrs=vr+source;\r
236\r
237 if(source+len > 0x10000) len=0x10000-source; // clip??\r
238\r
239 for(;len;len--)\r
240 {\r
241 vr[a] = *vrs++;\r
242 // AutoIncrement\r
243 a=(u16)(a+inc);\r
244 }\r
245 // remember addr\r
246 Pico.video.addr=a;\r
247 rendstatus|=0x10;\r
248}\r
249\r
250// check: Contra, Megaman\r
251// note: this is still inaccurate\r
252static void DmaFill(int data)\r
253{\r
254 int len;\r
255 unsigned short a=Pico.video.addr;\r
256 unsigned char *vr=(unsigned char *) Pico.vram;\r
257 unsigned char high = (unsigned char) (data >> 8);\r
258 unsigned char inc=Pico.video.reg[0xf];\r
259\r
260 len=GetDmaLength();\r
261 elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%i]", len, inc, SekCyclesDone());\r
262\r
263 Pico.m.dma_xfers += len;\r
264 if(Pico.m.scanline != -1)\r
265 Pico.video.status|=2; // dma busy (in accurate mode)\r
266\r
267 // from Charles MacDonald's genvdp.txt:\r
268 // Write lower byte to address specified\r
269 vr[a] = (unsigned char) data;\r
270 a=(u16)(a+inc);\r
271\r
272 if(!inc) len=1;\r
273\r
274 for(;len;len--) {\r
275 // Write upper byte to adjacent address\r
276 // (here we are byteswapped, so address is already 'adjacent')\r
277 vr[a] = high;\r
278\r
279 // Increment address register\r
280 a=(u16)(a+inc);\r
281 }\r
282 // remember addr\r
283 Pico.video.addr=a;\r
284 // update length\r
285 Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)\r
286\r
287 rendstatus|=0x10;\r
288}\r
289\r
290static void CommandDma(void)\r
291{\r
292 struct PicoVideo *pvid=&Pico.video;\r
293 int len=0,method=0;\r
294\r
295 if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled\r
296\r
297 len=GetDmaLength();\r
298\r
299 method=pvid->reg[0x17]>>6;\r
300 if (method< 2) DmaSlow(len); // 68000 to VDP\r
301 if (method==3) DmaCopy(len); // VRAM Copy\r
302}\r
303\r
304static void CommandChange(void)\r
305{\r
306 struct PicoVideo *pvid=&Pico.video;\r
307 unsigned int cmd=0,addr=0;\r
308\r
309 cmd=pvid->command;\r
310\r
311 // Get type of transfer 0xc0000030 (v/c/vsram read/write)\r
312 pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));\r
313\r
314 // Get address 0x3fff0003\r
315 addr =(cmd>>16)&0x3fff;\r
316 addr|=(cmd<<14)&0xc000;\r
317 pvid->addr=(unsigned short)addr;\r
318\r
319 // Check for dma:\r
320 if (cmd&0x80) CommandDma();\r
321}\r
322\r
323PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)\r
324{\r
325 struct PicoVideo *pvid=&Pico.video;\r
326\r
327 a&=0x1c;\r
328\r
329 if (a==0x00) // Data port 0 or 2\r
330 {\r
331 if (pvid->pending) {\r
332 CommandChange();\r
333 pvid->pending=0;\r
334 }\r
335\r
336 // If a DMA fill has been set up, do it\r
337 if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)\r
338 {\r
339 DmaFill(d);\r
340 }\r
341 else\r
342 {\r
343 // preliminary FIFO emulation for Chaos Engine, The (E)\r
344 if(!(pvid->status&8) && (pvid->reg[1]&0x40) && Pico.m.scanline!=-1 && !(PicoOpt&0x10000)) // active display, accurate mode?\r
345 {\r
346 pvid->status&=~0x200; // FIFO no longer empty\r
347 pvid->lwrite_cnt++;\r
348 if (pvid->lwrite_cnt >= 4) pvid->status|=0x100; // FIFO full\r
349 if (pvid->lwrite_cnt > 4) {\r
350 SekCyclesBurn(32); // penalty // 488/12-8\r
351 if (SekCycleCnt>=SekCycleAim) SekEndRun(0);\r
352 }\r
353 elprintf(EL_ASVDP, "VDP data write: %04x {%i} #%i @ %06x", d, Pico.video.type, pvid->lwrite_cnt, SekPc);\r
354 }\r
355 VideoWrite(d);\r
356 }\r
357 return;\r
358 }\r
359\r
360 if (a==0x04) // Control (command) port 4 or 6\r
361 {\r
362 if(pvid->pending)\r
363 {\r
364 // Low word of command:\r
365 pvid->command&=0xffff0000;\r
366 pvid->command|=d;\r
367 pvid->pending=0;\r
368 CommandChange();\r
369 } else {\r
370 if((d&0xc000)==0x8000)\r
371 {\r
372 // Register write:\r
373 int num=(d>>8)&0x1f;\r
374 int dold=pvid->reg[num];\r
375 if (num > 0x0a && !(pvid->reg[1]&4)) {\r
376 elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);\r
377 } else\r
378 pvid->reg[num]=(unsigned char)d;\r
379 if (num==00) elprintf(EL_INTSW, "hint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x10)>>4,\r
380 (d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);\r
381 if (num==01) elprintf(EL_INTSW, "vint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x20)>>5,\r
382 (d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);\r
383 if (num == 5 && (d^dold)) rendstatus|=1;\r
384 // renderers should update their palettes if sh/hi mode is changed\r
385 else if (num == 0xc && ((d^dold)&8)) Pico.m.dirtyPal = 2;\r
386#ifndef EMU_CORE_DEBUG\r
387 // update IRQ level (Lemmings, Wiz 'n' Liz intro, ... )\r
388 // may break if done improperly:\r
389 // International Superstar Soccer Deluxe (crash), Street Racer (logos), Burning Force (gfx),\r
390 // Fatal Rewind (crash), Sesame Street Counting Cafe\r
391 else if (num < 2)\r
392 {\r
393 if (!SekShouldInterrupt) // hack\r
394 {\r
395 int lines, pints, irq=0;\r
396 lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);\r
397 pints = (pvid->pending_ints&lines);\r
398 if(pints & 0x20) irq = 6;\r
399 else if(pints & 0x10) irq = 4;\r
400 SekInterrupt(irq); // update line\r
401\r
402 if (irq && Pico.m.scanline!=-1) SekEndRun(24); // make it delayed\r
403 }\r
404 }\r
405#endif\r
406 pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)\r
407 } else {\r
408 // High word of command:\r
409 pvid->command&=0x0000ffff;\r
410 pvid->command|=d<<16;\r
411 pvid->pending=1;\r
412 }\r
413 }\r
414 }\r
415}\r
416\r
417PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)\r
418{\r
419 unsigned int d=0;\r
420\r
421 a&=0x1c;\r
422\r
423\r
424 if (a==0x00) // data port\r
425 {\r
426 d=VideoRead();\r
427 goto end;\r
428 }\r
429\r
430 if (a==0x04) // control port\r
431 {\r
432 struct PicoVideo *pv=&Pico.video;\r
433 d=pv->status;\r
434 if (PicoOpt&0x10) d|=0x0020; // sprite collision (Shadow of the Beast)\r
435 if (!(pv->reg[1]&0x40)) d|=0x0008; // set V-Blank if display is disabled\r
436 if (SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs)\r
437\r
438 d|=(pv->pending_ints&0x20)<<2; // V-int pending?\r
439 if (d&0x100) pv->status&=~0x100; // FIFO no longer full\r
440\r
441 pv->pending=0; // ctrl port reads clear write-pending flag (Charles MacDonald)\r
442\r
443 elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc);\r
444 goto end;\r
445 }\r
446\r
447 // H-counter info (based on Generator):\r
448 // frame:\r
449 // | <- hblank? -> |\r
450 // start <416> hint <36> hdisplay <38> end // CPU cycles\r
451 // |---------...---------|------------|-------------|\r
452 // 0 B6 E4 FF // 40 cells\r
453 // 0 93 E8 FF // 32 cells\r
454\r
455 // Gens (?) v-render\r
456 // start <hblank=84> hint hdisplay <404> |\r
457 // |---------------------|--------------------------|\r
458 // E4 (hc[0x43]==0) 07 B1 // 40\r
459 // E8 (hc[0x45]==0) 05 91 // 32\r
460\r
461 // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune\r
462 if ((a&0x1c)==0x08)\r
463 {\r
464 unsigned int hc;\r
465\r
466 if(Pico.m.scanline != -1) {\r
467 int lineCycles=(488-SekCyclesLeft)&0x1ff;\r
468 d=Pico.m.scanline; // V-Counter\r
469\r
470 if(Pico.video.reg[12]&1)\r
471 hc=hcounts_40[lineCycles];\r
472 else hc=hcounts_32[lineCycles];\r
473\r
474 //if(lineCycles > 488-12) d++; // Wheel of Fortune\r
475 } else {\r
476 // get approximate V-Counter\r
477 d=vcounts[SekCyclesDone()>>8];\r
478 hc = Pico.m.rotate&0xff;\r
479 }\r
480\r
481 if(Pico.m.pal) {\r
482 if(d >= 0x103) d-=56; // based on Gens\r
483 } else {\r
484 if(d >= 0xEB) d-=6;\r
485 }\r
486\r
487 if((Pico.video.reg[12]&6) == 6) {\r
488 // interlace mode 2 (Combat Cars (UE) [!])\r
489 d <<= 1;\r
490 if (d&0xf00) d|= 1;\r
491 }\r
492\r
493 elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", hc, d, SekCyclesDone(), SekPc);\r
494 d&=0xff; d<<=8;\r
495 d|=hc;\r
496 goto end;\r
497 }\r
498\r
499end:\r
500\r
501 return d;\r
502}\r
fast MegaDrive/MegaCD/32X emulator