notaz.gp2x.de / picodrive.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
some dma improvements
[picodrive.git] / pico / videoport.c
CommitLineData
cff531af 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
cc68a136 9\r
efcba75f 10#include "pico_int.h"\r
0c7d1ba3 11#define NEED_DMA_SOURCE\r
7feeb880 12#include "memory.h"\r
cc68a136 13\r
53f948c9 14int line_base_cycles;\r
cc68a136 15extern const unsigned char hcounts_32[];\r
16extern const unsigned char hcounts_40[];\r
cc68a136 17\r
eff55556 18#ifndef UTYPES_DEFINED\r
ab0607f7 19typedef unsigned char u8;\r
cc68a136 20typedef unsigned short u16;\r
eff55556 21typedef unsigned int u32;\r
22#define UTYPES_DEFINED\r
23#endif\r
cc68a136 24\r
0c7d1ba3 25int (*PicoDmaHook)(unsigned int source, int len, unsigned short **base, unsigned int *mask) = NULL;\r
cc68a136 26\r
69996cb7 27static __inline void AutoIncrement(void)\r
cc68a136 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
947fb5f9 40 if (a - ((unsigned)(Pico.video.reg[5]&0x7f) << 9) < 0x400)\r
ea38612f 41 Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;\r
947fb5f9 42 break;\r
cc68a136 43 case 3: Pico.m.dirtyPal = 1;\r
cc68a136 44 Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)\r
45 case 5: Pico.vsram[(a>>1)&0x003f]=d; break;\r
d26dc685 46 //default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;\r
cc68a136 47 }\r
48\r
cc68a136 49 AutoIncrement();\r
50}\r
51\r
69996cb7 52static unsigned int VideoRead(void)\r
cc68a136 53{\r
54 unsigned int a=0,d=0;\r
55\r
56 a=Pico.video.addr; a>>=1;\r
57\r
58 switch (Pico.video.type)\r
59 {\r
60 case 0: d=Pico.vram [a&0x7fff]; break;\r
61 case 8: d=Pico.cram [a&0x003f]; break;\r
62 case 4: d=Pico.vsram[a&0x003f]; break;\r
69996cb7 63 default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;\r
cc68a136 64 }\r
4f672280 65\r
cc68a136 66 AutoIncrement();\r
67 return d;\r
68}\r
69\r
69996cb7 70static int GetDmaLength(void)\r
cc68a136 71{\r
72 struct PicoVideo *pvid=&Pico.video;\r
73 int len=0;\r
74 // 16-bit words to transfer:\r
75 len =pvid->reg[0x13];\r
76 len|=pvid->reg[0x14]<<8;\r
0c7d1ba3 77 len = ((len - 1) & 0xffff) + 1;\r
cc68a136 78 return len;\r
79}\r
80\r
0c7d1ba3 81static void DmaSlow(int len, unsigned int source)\r
cc68a136 82{\r
0c7d1ba3 83 u32 inc = Pico.video.reg[0xf];\r
84 u32 a = Pico.video.addr;\r
85 u16 *r, *base = NULL;\r
86 u32 mask = 0x1ffff;\r
cc68a136 87\r
0c7d1ba3 88 elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%u] @ %06x",\r
312e9ce1 89 Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),\r
69996cb7 90 SekCyclesDone(), SekPc);\r
cc68a136 91\r
2aa27095 92 Pico.m.dma_xfers += len;\r
0c7d1ba3 93 if (Pico.m.dma_xfers < len) // lame 16bit var\r
94 Pico.m.dma_xfers = ~0;\r
ae214f1c 95 SekCyclesBurnRun(CheckDMA());\r
672ad671 96\r
0c7d1ba3 97 if ((source & 0xe00000) == 0xe00000) { // Ram\r
98 base = (u16 *)Pico.ram;\r
99 mask = 0xffff;\r
602133e1 100 }\r
101 else if (PicoAHW & PAHW_MCD)\r
102 {\r
0c7d1ba3 103 u8 r3 = Pico_mcd->s68k_regs[3];\r
104 elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", r3);\r
105 if (source < 0x20000) { // Bios area\r
106 base = (u16 *)Pico_mcd->bios;\r
107 } else if ((source & 0xfc0000) == 0x200000) { // Word Ram\r
108 if (!(r3 & 4)) { // 2M mode\r
109 base = (u16 *)(Pico_mcd->word_ram2M + (source & 0x20000));\r
ab0607f7 110 } else {\r
fa1e5e29 111 if (source < 0x220000) { // 1M mode\r
0c7d1ba3 112 int bank = r3 & 1;\r
113 base = (u16 *)(Pico_mcd->word_ram1M[bank]);\r
69996cb7 114 } else {\r
0c7d1ba3 115 DmaSlowCell(source - 2, a, len, inc);\r
fa1e5e29 116 return;\r
69996cb7 117 }\r
ab0607f7 118 }\r
0c7d1ba3 119 source -= 2;\r
120 } else if ((source & 0xfe0000) == 0x020000) { // Prg Ram\r
121 base = (u16 *)Pico_mcd->prg_ram_b[r3 >> 6];\r
122 source -= 2; // XXX: test\r
ab0607f7 123 }\r
602133e1 124 }\r
125 else\r
126 {\r
50483b53 127 // if we have DmaHook, let it handle ROM because of possible DMA delay\r
0c7d1ba3 128 u32 source2;\r
129 if (PicoDmaHook && (source2 = PicoDmaHook(source, len, &base, &mask)))\r
130 source = source2;\r
131 else // Rom\r
132 base = m68k_dma_source(source);\r
ab0607f7 133 }\r
0c7d1ba3 134 if (!base) {\r
135 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);\r
136 return;\r
672ad671 137 }\r
cc68a136 138\r
0c7d1ba3 139 // operate in words\r
140 source >>= 1;\r
141 mask >>= 1;\r
142\r
cc68a136 143 switch (Pico.video.type)\r
144 {\r
145 case 1: // vram\r
146 r = Pico.vram;\r
0c7d1ba3 147 if (inc == 2 && !(a & 1) && a + len * 2 < 0x10000\r
148 && !(((source + len - 1) ^ source) & ~mask))\r
cc68a136 149 {\r
cea65903 150 // most used DMA mode\r
0c7d1ba3 151 memcpy((char *)r + a, base + (source & mask), len * 2);\r
152 a += len * 2;\r
cea65903 153 }\r
154 else\r
155 {\r
156 for(; len; len--)\r
157 {\r
0c7d1ba3 158 u16 d = base[source++ & mask];\r
159 if(a & 1) d=(d<<8)|(d>>8);\r
160 r[a >> 1] = d;\r
cea65903 161 // AutoIncrement\r
0c7d1ba3 162 a = (u16)(a + inc);\r
cea65903 163 }\r
cc68a136 164 }\r
ea38612f 165 Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;\r
cc68a136 166 break;\r
4f672280 167\r
cc68a136 168 case 3: // cram\r
cc68a136 169 Pico.m.dirtyPal = 1;\r
170 r = Pico.cram;\r
0c7d1ba3 171 for (; len; len--)\r
cc68a136 172 {\r
0c7d1ba3 173 r[(a / 2) & 0x3f] = base[source++ & mask];\r
cc68a136 174 // AutoIncrement\r
0c7d1ba3 175 a += inc;\r
cc68a136 176 }\r
cc68a136 177 break;\r
178\r
0c7d1ba3 179 case 5: // vsram\r
cc68a136 180 r = Pico.vsram;\r
0c7d1ba3 181 for (; len; len--)\r
cc68a136 182 {\r
0c7d1ba3 183 r[(a / 2) & 0x3f] = base[source++ & mask];\r
cc68a136 184 // AutoIncrement\r
0c7d1ba3 185 a += inc;\r
cc68a136 186 }\r
cc68a136 187 break;\r
69996cb7 188\r
189 default:\r
e7b3ad1b 190 if (Pico.video.type != 0 || (EL_LOGMASK & EL_VDPDMA))\r
191 elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);\r
69996cb7 192 break;\r
cc68a136 193 }\r
194 // remember addr\r
195 Pico.video.addr=(u16)a;\r
196}\r
197\r
198static void DmaCopy(int len)\r
199{\r
200 u16 a=Pico.video.addr;\r
201 unsigned char *vr = (unsigned char *) Pico.vram;\r
cc68a136 202 unsigned char inc=Pico.video.reg[0xf];\r
203 int source;\r
69996cb7 204 elprintf(EL_VDPDMA, "DmaCopy len %i [%i]", len, SekCyclesDone());\r
4f672280 205\r
69996cb7 206 Pico.m.dma_xfers += len;\r
0c7d1ba3 207 if (Pico.m.dma_xfers < len)\r
208 Pico.m.dma_xfers = ~0;\r
2aa27095 209 Pico.video.status |= 2; // dma busy\r
cc68a136 210\r
211 source =Pico.video.reg[0x15];\r
212 source|=Pico.video.reg[0x16]<<8;\r
cc68a136 213\r
2aa27095 214 for (; len; len--)\r
cc68a136 215 {\r
0c7d1ba3 216 vr[a] = vr[source++ & 0xffff];\r
cc68a136 217 // AutoIncrement\r
218 a=(u16)(a+inc);\r
219 }\r
220 // remember addr\r
221 Pico.video.addr=a;\r
ea38612f 222 Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;\r
cc68a136 223}\r
224\r
0c7d1ba3 225static NOINLINE void DmaFill(int data)\r
cc68a136 226{\r
cc68a136 227 unsigned short a=Pico.video.addr;\r
228 unsigned char *vr=(unsigned char *) Pico.vram;\r
229 unsigned char high = (unsigned char) (data >> 8);\r
230 unsigned char inc=Pico.video.reg[0xf];\r
0c7d1ba3 231 int source;\r
232 int len, l;\r
4f672280 233\r
0c7d1ba3 234 len = GetDmaLength();\r
69996cb7 235 elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%i]", len, inc, SekCyclesDone());\r
4f672280 236\r
69996cb7 237 Pico.m.dma_xfers += len;\r
0c7d1ba3 238 if (Pico.m.dma_xfers < len) // lame 16bit var\r
239 Pico.m.dma_xfers = ~0;\r
2aa27095 240 Pico.video.status |= 2; // dma busy\r
cc68a136 241\r
0c7d1ba3 242 switch (Pico.video.type)\r
243 {\r
244 case 1: // vram\r
245 for (l = len; l; l--) {\r
246 // Write upper byte to adjacent address\r
247 // (here we are byteswapped, so address is already 'adjacent')\r
248 vr[a] = high;\r
cc68a136 249\r
0c7d1ba3 250 // Increment address register\r
251 a = (u16)(a + inc);\r
252 }\r
253 break;\r
254 case 3: // cram\r
255 case 5: { // vsram\r
256 // TODO: needs fifo; anyone using these?\r
257 static int once;\r
258 if (!once++)\r
259 elprintf(EL_STATUS|EL_ANOMALY|EL_VDPDMA, "TODO: cram/vsram fill");\r
260 }\r
261 default:\r
262 a += len * inc;\r
263 break;\r
cc68a136 264 }\r
0c7d1ba3 265\r
cc68a136 266 // remember addr\r
0c7d1ba3 267 Pico.video.addr = a;\r
268 // register update\r
269 Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0;\r
270 source = Pico.video.reg[0x15];\r
271 source |= Pico.video.reg[0x16] << 8;\r
272 source += len;\r
273 Pico.video.reg[0x15] = source;\r
274 Pico.video.reg[0x16] = source >> 8;\r
cc68a136 275\r
ea38612f 276 Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;\r
cc68a136 277}\r
278\r
0c7d1ba3 279static NOINLINE void CommandDma(void)\r
cc68a136 280{\r
281 struct PicoVideo *pvid=&Pico.video;\r
0c7d1ba3 282 u32 len, method;\r
283 u32 source;\r
cc68a136 284\r
285 if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled\r
286\r
0c7d1ba3 287 len = GetDmaLength();\r
288 source =Pico.video.reg[0x15];\r
289 source|=Pico.video.reg[0x16] << 8;\r
290 source|=Pico.video.reg[0x17] << 16;\r
cc68a136 291\r
292 method=pvid->reg[0x17]>>6;\r
0c7d1ba3 293 if (method < 2)\r
294 DmaSlow(len, source << 1); // 68000 to VDP\r
295 else if (method == 3)\r
296 DmaCopy(len); // VRAM Copy\r
297 else\r
298 return;\r
299\r
300 source += len;\r
301 Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0;\r
302 Pico.video.reg[0x15] = source;\r
303 Pico.video.reg[0x16] = source >> 8;\r
cc68a136 304}\r
305\r
69996cb7 306static void CommandChange(void)\r
cc68a136 307{\r
308 struct PicoVideo *pvid=&Pico.video;\r
309 unsigned int cmd=0,addr=0;\r
310\r
311 cmd=pvid->command;\r
312\r
313 // Get type of transfer 0xc0000030 (v/c/vsram read/write)\r
314 pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));\r
315\r
316 // Get address 0x3fff0003\r
317 addr =(cmd>>16)&0x3fff;\r
318 addr|=(cmd<<14)&0xc000;\r
319 pvid->addr=(unsigned short)addr;\r
cc68a136 320}\r
321\r
697746df 322static void DrawSync(int blank_on)\r
b6d7ac70 323{\r
324 if (Pico.m.scanline < 224 && !(PicoOpt & POPT_ALT_RENDERER) &&\r
ea38612f 325 !PicoSkipFrame && Pico.est.DrawScanline <= Pico.m.scanline) {\r
2aa27095 326 //elprintf(EL_ANOMALY, "sync");\r
b6d7ac70 327 PicoDrawSync(Pico.m.scanline, blank_on);\r
328 }\r
329}\r
330\r
eff55556 331PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)\r
cc68a136 332{\r
333 struct PicoVideo *pvid=&Pico.video;\r
334\r
2aa27095 335 //if (Pico.m.scanline < 224)\r
336 // elprintf(EL_STATUS, "PicoVideoWrite [%06x] %04x", a, d);\r
cc68a136 337 a&=0x1c;\r
338\r
339 if (a==0x00) // Data port 0 or 2\r
4f672280 340 {\r
b6d7ac70 341 // try avoiding the sync..\r
342 if (Pico.m.scanline < 224 && (pvid->reg[1]&0x40) &&\r
343 !(!pvid->pending &&\r
344 ((pvid->command & 0xc00000f0) == 0x40000010 && Pico.vsram[pvid->addr>>1] == d))\r
345 )\r
346 DrawSync(0);\r
347\r
69996cb7 348 if (pvid->pending) {\r
349 CommandChange();\r
350 pvid->pending=0;\r
351 }\r
cc68a136 352\r
0c7d1ba3 353 // preliminary FIFO emulation for Chaos Engine, The (E)\r
354 if (!(pvid->status&8) && (pvid->reg[1]&0x40) && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display?\r
cc68a136 355 {\r
0c7d1ba3 356 pvid->status&=~0x200; // FIFO no longer empty\r
357 pvid->lwrite_cnt++;\r
358 if (pvid->lwrite_cnt >= 4) pvid->status|=0x100; // FIFO full\r
359 if (pvid->lwrite_cnt > 4) {\r
360 SekCyclesBurnRun(32); // penalty // 488/12-8\r
69996cb7 361 }\r
0c7d1ba3 362 elprintf(EL_ASVDP, "VDP data write: %04x [%06x] {%i} #%i @ %06x", d, Pico.video.addr,\r
363 Pico.video.type, pvid->lwrite_cnt, SekPc);\r
cc68a136 364 }\r
0c7d1ba3 365 VideoWrite(d);\r
366\r
367 if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)\r
368 DmaFill(d);\r
369\r
cc68a136 370 return;\r
371 }\r
372\r
373 if (a==0x04) // Control (command) port 4 or 6\r
374 {\r
b6d7ac70 375 if (pvid->pending)\r
cc68a136 376 {\r
377 // Low word of command:\r
0c7d1ba3 378 pvid->command &= 0xffff0000;\r
379 pvid->command |= d;\r
380 pvid->pending = 0;\r
cc68a136 381 CommandChange();\r
0c7d1ba3 382 // Check for dma:\r
383 if (d & 0x80) {\r
384 DrawSync(0);\r
385 CommandDma();\r
386 }\r
602133e1 387 }\r
388 else\r
389 {\r
390 if ((d&0xc000)==0x8000)\r
cc68a136 391 {\r
392 // Register write:\r
393 int num=(d>>8)&0x1f;\r
0ffefdb8 394 int dold=pvid->reg[num];\r
147f8df1 395 int blank_on = 0;\r
602133e1 396 pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)\r
0ffefdb8 397 if (num > 0x0a && !(pvid->reg[1]&4)) {\r
398 elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);\r
602133e1 399 return;\r
b6d7ac70 400 }\r
602133e1 401\r
53f948c9 402 if (num == 1 && !(d&0x40) && SekCyclesDone() - line_base_cycles <= 488-390)\r
403 blank_on = 1;\r
147f8df1 404 DrawSync(blank_on);\r
405 pvid->reg[num]=(unsigned char)d;\r
602133e1 406 switch (num)\r
407 {\r
408 case 0x00:\r
409 elprintf(EL_INTSW, "hint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x10)>>4,\r
410 (d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);\r
147f8df1 411 goto update_irq;\r
602133e1 412 case 0x01:\r
413 elprintf(EL_INTSW, "vint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x20)>>5,\r
414 (d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);\r
147f8df1 415 goto update_irq;\r
602133e1 416 case 0x05:\r
4c436138 417 //elprintf(EL_STATUS, "spritep moved to %04x", (unsigned)(Pico.video.reg[5]&0x7f) << 9);\r
ea38612f 418 if (d^dold) Pico.est.rendstatus |= PDRAW_SPRITES_MOVED;\r
602133e1 419 break;\r
420 case 0x0c:\r
421 // renderers should update their palettes if sh/hi mode is changed\r
422 if ((d^dold)&8) Pico.m.dirtyPal = 2;\r
423 break;\r
424 }\r
147f8df1 425 return;\r
602133e1 426\r
147f8df1 427update_irq:\r
03e4f2a3 428#ifndef EMU_CORE_DEBUG\r
b6d7ac70 429 // update IRQ level\r
08769494 430 if (!SekShouldInterrupt()) // hack\r
03e4f2a3 431 {\r
602133e1 432 int lines, pints, irq=0;\r
433 lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);\r
434 pints = (pvid->pending_ints&lines);\r
b6d7ac70 435 if (pints & 0x20) irq = 6;\r
436 else if (pints & 0x10) irq = 4;\r
602133e1 437 SekInterrupt(irq); // update line\r
438\r
2aa27095 439 if (irq) SekEndRun(24); // make it delayed\r
cc68a136 440 }\r
cc68a136 441#endif\r
602133e1 442 }\r
443 else\r
444 {\r
cc68a136 445 // High word of command:\r
446 pvid->command&=0x0000ffff;\r
447 pvid->command|=d<<16;\r
448 pvid->pending=1;\r
449 }\r
450 }\r
451 }\r
452}\r
453\r
eff55556 454PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)\r
cc68a136 455{\r
cc68a136 456 a&=0x1c;\r
457\r
cc68a136 458 if (a==0x04) // control port\r
459 {\r
69996cb7 460 struct PicoVideo *pv=&Pico.video;\r
b6d7ac70 461 unsigned int d;\r
69996cb7 462 d=pv->status;\r
9761a7d0 463 //if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)\r
53f948c9 464 if (SekCyclesDone() - line_base_cycles >= 488-88)\r
465 d|=0x0004; // H-Blank (Sonic3 vs)\r
69996cb7 466\r
9761a7d0 467 d |= ((pv->reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled\r
468 d |= (pv->pending_ints&0x20)<<2; // V-int pending?\r
69996cb7 469 if (d&0x100) pv->status&=~0x100; // FIFO no longer full\r
cc68a136 470\r
9761a7d0 471 pv->pending = 0; // ctrl port reads clear write-pending flag (Charles MacDonald)\r
cc68a136 472\r
69996cb7 473 elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc);\r
b6d7ac70 474 return d;\r
cc68a136 475 }\r
476\r
477 // H-counter info (based on Generator):\r
478 // frame:\r
479 // | <- hblank? -> |\r
480 // start <416> hint <36> hdisplay <38> end // CPU cycles\r
481 // |---------...---------|------------|-------------|\r
482 // 0 B6 E4 FF // 40 cells\r
483 // 0 93 E8 FF // 32 cells\r
484\r
485 // Gens (?) v-render\r
486 // start <hblank=84> hint hdisplay <404> |\r
487 // |---------------------|--------------------------|\r
488 // E4 (hc[0x43]==0) 07 B1 // 40\r
489 // E8 (hc[0x45]==0) 05 91 // 32\r
4f672280 490\r
cc68a136 491 // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune\r
492 if ((a&0x1c)==0x08)\r
493 {\r
9761a7d0 494 unsigned int d;\r
947fb5f9 495\r
53f948c9 496 d = (SekCyclesDone() - line_base_cycles) & 0x1ff; // FIXME\r
2aa27095 497 if (Pico.video.reg[12]&1)\r
53f948c9 498 d = hcounts_40[d];\r
499 else d = hcounts_32[d];\r
cc68a136 500\r
9761a7d0 501 elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc);\r
502 return d | (Pico.video.v_counter << 8);\r
503 }\r
cc68a136 504\r
9761a7d0 505 if (a==0x00) // data port\r
506 {\r
507 return VideoRead();\r
508 }\r
cc68a136 509\r
9761a7d0 510 return 0;\r
511}\r
512\r
513unsigned int PicoVideoRead8(unsigned int a)\r
514{\r
515 unsigned int d;\r
516 a&=0x1d;\r
517\r
518 switch (a)\r
519 {\r
520 case 0: return VideoRead() >> 8;\r
521 case 1: return VideoRead() & 0xff;\r
522 case 4: // control port/status reg\r
523 d = Pico.video.status >> 8;\r
524 if (d&1) Pico.video.status&=~0x100; // FIFO no longer full\r
525 Pico.video.pending = 0;\r
526 elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);\r
527 return d;\r
528 case 5:\r
529 d = Pico.video.status & 0xff;\r
530 //if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)\r
531 d |= ((Pico.video.reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled\r
532 d |= (Pico.video.pending_ints&0x20)<<2; // V-int pending?\r
53f948c9 533 if (SekCyclesDone() - line_base_cycles >= 488-88) d |= 4; // H-Blank\r
9761a7d0 534 Pico.video.pending = 0;\r
535 elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);\r
536 return d;\r
537 case 8: // hv counter\r
538 elprintf(EL_HVCNT, "vcounter: %02x (%i) @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc);\r
539 return Pico.video.v_counter;\r
540 case 9:\r
53f948c9 541 d = (SekCyclesDone() - line_base_cycles) & 0x1ff; // FIXME\r
9761a7d0 542 if (Pico.video.reg[12]&1)\r
543 d = hcounts_40[d];\r
544 else d = hcounts_32[d];\r
545 elprintf(EL_HVCNT, "hcounter: %02x (%i) @ %06x", d, SekCyclesDone(), SekPc);\r
546 return d;\r
cc68a136 547 }\r
548\r
b6d7ac70 549 return 0;\r
cc68a136 550}\r
e7b3ad1b 551\r
552// vim:shiftwidth=2:ts=2:expandtab\r
fast MegaDrive/MegaCD/32X emulator