Sonic CD shows Sega logo
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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 notaz, All rights reserved.\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 "sound/sound.h"\r
12#include "sound/ym2612.h"\r
13\r
14int PicoVer=0x0080;\r
15struct Pico Pico;\r
16int PicoOpt=0; // disable everything by default\r
17int PicoSkipFrame=0; // skip rendering frame?\r
18int PicoRegionOverride = 0; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe\r
19int emustatus = 0;\r
20void (*PicoWriteSound)(void) = 0; // called once per frame at the best time to send sound buffer (PsndOut) to hardware\r
21\r
22struct PicoSRAM SRam;\r
23int z80startCycle = 0, z80stopCycle = 0; // in 68k cycles\r
24//int z80ExtraCycles = 0;\r
25int PicoPad[2]; // Joypads, format is SACB RLDU\r
26int PicoMCD = 0; // mega CD status: scd_started, reset_pending\r
27\r
28// to be called once on emu init\r
29int PicoInit(void)\r
30{\r
31 // Blank space for state:\r
32 memset(&Pico,0,sizeof(Pico));\r
33 memset(&PicoPad,0,sizeof(PicoPad));\r
34\r
35 // Init CPUs:\r
36 SekInit();\r
37 z80_init(); // init even if we aren't going to use it\r
38\r
39 // Setup memory callbacks:\r
40 PicoMemInit();\r
41\r
42 PicoInitMCD();\r
43\r
44 // notaz: sram\r
45 SRam.data=0;\r
46 SRam.resize=1;\r
47\r
48 return 0;\r
49}\r
50\r
51// to be called once on emu exit\r
52void PicoExit(void)\r
53{\r
54 PicoExitMCD();\r
55 z80_exit();\r
56\r
57 // notaz: sram\r
58 if(SRam.data) free(SRam.data); SRam.data=0;\r
59}\r
60\r
61int PicoReset(int hard)\r
62{\r
63 unsigned int region=0;\r
64 int support=0,hw=0,i=0;\r
65 unsigned char pal=0;\r
66\r
67 if (Pico.romsize<=0) return 1;\r
68\r
69 PicoMemReset();\r
70 SekReset();\r
71 SekCycleCntT=0;\r
72 z80_reset();\r
73\r
74 // reset VDP state, VRAM and PicoMisc\r
75 //memset(&Pico.video,0,sizeof(Pico.video));\r
76 //memset(&Pico.vram,0,sizeof(Pico.vram));\r
77 memset(&Pico.m,0,sizeof(Pico.m));\r
78 Pico.video.pending_ints=0;\r
79 emustatus = 0;\r
80\r
81 if(hard) {\r
82 // clear all memory of the emulated machine\r
83 memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);\r
84 }\r
85\r
86 // default VDP register values (based on Fusion)\r
87 Pico.video.reg[0] = Pico.video.reg[1] = 0x04;\r
88 Pico.video.reg[0xc] = 0x81;\r
89 Pico.video.reg[0xf] = 0x02;\r
90 Pico.m.dirtyPal = 1;\r
91\r
92 if(PicoRegionOverride)\r
93 {\r
94 support = PicoRegionOverride;\r
95 }\r
96 else\r
97 {\r
98 // Read cartridge region data:\r
99 region=PicoRead32(0x1f0);\r
100\r
101 for (i=0;i<4;i++)\r
102 {\r
103 int c=0;\r
104\r
105 c=region>>(i<<3); c&=0xff;\r
106 if (c<=' ') continue;\r
107\r
108 if (c=='J') support|=1;\r
109 else if (c=='U') support|=4;\r
110 else if (c=='E') support|=8;\r
111 else\r
112 {\r
113 // New style code:\r
114 char s[2]={0,0};\r
115 s[0]=(char)c;\r
116 support|=strtol(s,NULL,16);\r
117 }\r
118 }\r
119 }\r
120\r
121 // Try to pick the best hardware value for English/50hz:\r
122 if (support&8) { hw=0xc0; pal=1; } // Europe\r
123 else if (support&4) hw=0x80; // USA\r
124 else if (support&2) { hw=0x40; pal=1; } // Japan PAL\r
125 else if (support&1) hw=0x00; // Japan NTSC\r
126 else hw=0x80; // USA\r
127\r
128 Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached\r
129 Pico.m.pal=pal;\r
130 Pico.video.status = 0x3408 | pal; // always set bits | vblank | pal\r
131\r
132 sound_reset(); // pal must be known here\r
133\r
134 if (PicoMCD & 1) {\r
135 PicoResetMCD(hard);\r
136 SRam.data = 0;\r
137 return 0;\r
138 }\r
139\r
140\r
141 // notaz: sram\r
142 if(SRam.resize) {\r
143 int sram_size = 0;\r
144 if(SRam.data) free(SRam.data); SRam.data=0;\r
145 Pico.m.sram_reg = 0;\r
146\r
147 if(*(Pico.rom+0x1B1) == 'R' && *(Pico.rom+0x1B0) == 'A') {\r
148 if(*(Pico.rom+0x1B2) & 0x40) {\r
149 // EEPROM SRAM\r
150 // what kind of EEPROMs are actually used? X24C02? X24C04? (X24C01 has only 128), but we will support up to 8K\r
151 SRam.start = PicoRead32(0x1B4) & ~1; // zero address is used for clock by some games\r
152 SRam.end = PicoRead32(0x1B8);\r
153 sram_size = 0x2000;\r
154 Pico.m.sram_reg = 4;\r
155 } else {\r
156 // normal SRAM\r
157 SRam.start = PicoRead32(0x1B4) & 0xFFFF00;\r
158 SRam.end = PicoRead32(0x1B8) | 1;\r
159 sram_size = SRam.end - SRam.start + 1;\r
160 }\r
161 Pico.m.sram_reg |= 0x10; // SRAM was detected\r
162 }\r
163 if(sram_size <= 0) {\r
164 // some games may have bad headers, like S&K and Sonic3\r
165 SRam.start = 0x200000;\r
166 SRam.end = 0x203FFF;\r
167 sram_size = 0x004000;\r
168 }\r
169\r
170 // enable sram access by default if it doesn't overlap with ROM\r
171 if(Pico.romsize <= SRam.start) Pico.m.sram_reg |= 1;\r
172 SRam.reg_back = Pico.m.sram_reg;\r
173\r
174 if(sram_size) {\r
175 SRam.data = (unsigned char *) calloc(sram_size, 1);\r
176 if(!SRam.data) return 1;\r
177 }\r
178 SRam.resize=0;\r
179 // Dino Dini's Soccer malfunctions if SRAM is not filled with 0xff\r
180 if (strncmp((char *)Pico.rom+0x150, "IDOND NI'I", 10) == 0)\r
181 memset(SRam.data, 0xff, sram_size);\r
182 }\r
183\r
184 Pico.m.sram_reg = SRam.reg_back; // restore sram_reg\r
185 SRam.changed = 0;\r
186\r
187 return 0;\r
188}\r
189\r
190static int dma_timings[] = {\r
19183, 167, 166, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy\r
192102, 205, 204, 102, // vblank: 40cell:\r
1938, 16, 15, 8, // active: 32cell:\r
1949, 18, 17, 9 // ...\r
195};\r
196\r
197static int dma_bsycles[] = {\r
198(488<<8)/83, (488<<8)/167, (488<<8)/166, (488<<8)/83,\r
199(488<<8)/102, (488<<8)/205, (488<<8)/204, (488<<8)/102,\r
200(488<<8)/8, (488<<8)/16, (488<<8)/15, (488<<8)/8,\r
201(488<<8)/9, (488<<8)/18, (488<<8)/17, (488<<8)/9\r
202};\r
203\r
204//static\r
205int CheckDMA(void)\r
206{\r
207 int burn = 0, bytes_can = 0, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes\r
208 int bytes = Pico.m.dma_bytes;\r
209 int dma_op1;\r
210\r
211 if(!(dma_op&2)) dma_op = (Pico.video.type==1) ? 0 : 1; // setting dma_timings offset here according to Gens\r
212 dma_op1 = dma_op;\r
213 if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?\r
214 if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?\r
215 bytes_can = dma_timings[dma_op];\r
216\r
217 if(bytes <= bytes_can) {\r
218 if(dma_op&2) Pico.video.status&=~2; // dma no longer busy\r
219 else {\r
220 burn = bytes * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division..\r
221 //SekCycleCnt-=Pico.m.dma_endcycles;\r
222 //Pico.m.dma_endcycles = 0;\r
223 }\r
224 Pico.m.dma_bytes = 0;\r
225 } else {\r
226 if(!(dma_op&2)) burn = 488;\r
227 Pico.m.dma_bytes -= bytes_can;\r
228 }\r
229\r
230 //SekCycleCnt+=burn;\r
231 dprintf("~Dma %i op=%i can=%i burn=%i [%i|%i]", Pico.m.dma_bytes, dma_op1, bytes_can, burn, Pico.m.scanline, SekCyclesDone());\r
232 //dprintf("~aim: %i, cnt: %i", SekCycleAim, SekCycleCnt);\r
233 return burn;\r
234}\r
235\r
236static __inline void SekRun(int cyc)\r
237{\r
238 int cyc_do;\r
239 SekCycleAim+=cyc;\r
240#if 0\r
241 if(Pico.m.dma_bytes) {\r
242 int burn=0;\r
243 if((Pico.video.status&8)||!(Pico.video.reg[1]&0x40)) { // vblank?\r
244 if(Pico.m.dma_bytes < 205) {\r
245 burn = Pico.m.dma_bytes*(((488<<8)/205))>>8;\r
246 Pico.m.dma_bytes = 0;\r
247 } else {\r
248 burn += 488;\r
249 Pico.m.dma_bytes -= 205;\r
250 }\r
251 } else {\r
252 if(Pico.m.dma_bytes < 18) {\r
253 burn = Pico.m.dma_bytes*(((488<<8)/18))>>8;\r
254 Pico.m.dma_bytes = 0;\r
255 } else {\r
256 burn += 488;\r
257 Pico.m.dma_bytes -= 18;\r
258 }\r
259 }\r
260 SekCycleCnt+=burn;\r
261 dprintf("~DmaSlow %i burn=%i do=%i [%i|%i]", Pico.m.dma_bytes, burn, SekCycleAim-SekCycleCnt,\r
262 Pico.m.scanline, SekCyclesDone());\r
263 }\r
264#endif\r
265 //dprintf("aim: %i, cnt: %i", SekCycleAim, SekCycleCnt);\r
266 if((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;\r
267 //dprintf("cyc_do: %i", cyc_do);\r
268#if defined(EMU_C68K) && defined(EMU_M68K)\r
269 // this means we do run-compare Cyclone vs Musashi\r
270 SekCycleCnt+=CM_compareRun(cyc_do);\r
271#elif defined(EMU_C68K)\r
272 PicoCpu.cycles=cyc_do;\r
273 CycloneRun(&PicoCpu);\r
274 SekCycleCnt+=cyc_do-PicoCpu.cycles;\r
275#elif defined(EMU_A68K)\r
276 m68k_ICount=cyc_do;\r
277 M68000_RUN();\r
278 SekCycleCnt+=cyc_do-m68k_ICount;\r
279#elif defined(EMU_M68K)\r
280 SekCycleCnt+=m68k_execute(cyc_do);\r
281#endif\r
282}\r
283\r
284static __inline void SekStep(void)\r
285{\r
286 // this is required for timing sensitive stuff to work\r
287 int realaim=SekCycleAim; SekCycleAim=SekCycleCnt+1;\r
288#if defined(EMU_C68K) && defined(EMU_M68K)\r
289 // this means we do run-compare Cyclone vs Musashi\r
290 SekCycleCnt+=CM_compareRun(1);\r
291#elif defined(EMU_C68K)\r
292 PicoCpu.cycles=1;\r
293 CycloneRun(&PicoCpu);\r
294 SekCycleCnt+=1-PicoCpu.cycles;\r
295#elif defined(EMU_A68K)\r
296 m68k_ICount=1;\r
297 M68000_RUN();\r
298 SekCycleCnt+=1-m68k_ICount;\r
299#elif defined(EMU_M68K)\r
300 SekCycleCnt+=m68k_execute(1);\r
301#endif\r
302 SekCycleAim=realaim;\r
303}\r
304\r
305static int CheckIdle(void)\r
306{\r
307#if 1\r
308 unsigned char state[0x88];\r
309\r
310 memset(state,0,sizeof(state));\r
311\r
312 // See if the state is the same after 2 steps:\r
313 SekState(state); SekStep(); SekStep(); SekState(state+0x44);\r
314 if (memcmp(state,state+0x44,0x44)==0) return 1;\r
315#else\r
316 unsigned char state[0x44];\r
317 static unsigned char oldstate[0x44];\r
318\r
319 SekState(state);\r
320 if(memcmp(state,oldstate,0x40)==0) return 1;\r
321 memcpy(oldstate, state, 0x40);\r
322#endif\r
323\r
324 return 0;\r
325}\r
326\r
327// to be called on 224 or line_sample scanlines only\r
328static __inline void getSamples(int y)\r
329{\r
330 if(y == 224) {\r
331 //dprintf("sta%i: %i [%i]", (emustatus & 2), emustatus, y);\r
332 if(emustatus & 2)\r
333 sound_render(PsndLen/2, PsndLen-PsndLen/2);\r
334 else sound_render(0, PsndLen);\r
335 if (emustatus&1) emustatus|=2; else emustatus&=~2;\r
336 if (PicoWriteSound) PicoWriteSound();\r
337 // clear sound buffer\r
338 memset(PsndOut, 0, (PicoOpt & 8) ? (PsndLen<<2) : (PsndLen<<1));\r
339 }\r
340 else if(emustatus & 3) {\r
341 emustatus|= 2;\r
342 emustatus&=~1;\r
343 sound_render(0, PsndLen/2);\r
344 }\r
345}\r
346\r
347//extern UINT32 mz80GetRegisterValue(void *, UINT32);\r
348\r
349// Accurate but slower frame which does hints\r
350static int PicoFrameHints(void)\r
351{\r
352 struct PicoVideo *pv=&Pico.video;\r
353 int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample;\r
354 const int cycles_68k=488,cycles_z80=228; // both PAL and NTSC compile to same values\r
355 int skip=PicoSkipFrame || (PicoOpt&0x10);\r
356 int hint; // Hint counter\r
357\r
358 if(Pico.m.pal) { //\r
359 //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488)\r
360 //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228\r
361 lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well\r
362 line_sample = 68;\r
363 if(pv->reg[1]&8) lines_vis = 240;\r
364 } else {\r
365 //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488\r
366 //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228\r
367 lines = 262;\r
368 line_sample = 93;\r
369 }\r
370\r
371 SekCyclesReset();\r
372 //z80ExtraCycles = 0;\r
373\r
374 if(PicoOpt&4)\r
375 z80CycleAim = 0;\r
376// z80_resetCycles();\r
377\r
378 pv->status&=~0x88; // clear V-Int, come out of vblank\r
379\r
380 hint=pv->reg[10]; // Load H-Int counter\r
381 //dprintf("-hint: %i", hint);\r
382\r
383 for (y=0;y<lines;y++)\r
384 {\r
385 Pico.m.scanline=(short)y;\r
386\r
387 // pad delay (for 6 button pads)\r
388 if(PicoOpt&0x20) {\r
389 if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;\r
390 if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;\r
391 }\r
392\r
393 // H-Interrupts:\r
394 if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe\r
395 {\r
396 //dprintf("rhint:old @ %06x", SekPc);\r
397 hint=pv->reg[10]; // Reload H-Int counter\r
398 pv->pending_ints|=0x10;\r
399 if (pv->reg[0]&0x10) SekInterrupt(4);\r
400 //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt);\r
401 //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86));\r
402 }\r
403\r
404 // V-Interrupt:\r
405 if (y == lines_vis)\r
406 {\r
407 dprintf("vint: @ %06x [%i|%i], aim=%i cnt=%i", SekPc, y, SekCycleCnt, SekCycleAim, SekCycleCnt);\r
408 pv->status|=0x08; // go into vblank\r
409 if(!Pico.m.dma_bytes||(Pico.video.reg[0x17]&0x80)) {\r
410 // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)\r
411 SekRun(128); SekCycleAim-=128; // 128; ?\r
412 }\r
413 dprintf("[%i|%i], aim=%i cnt=%i @ %x", y, SekCycleCnt, SekCycleAim, SekCycleCnt, SekPc);\r
414 pv->status|=0x80; // V-Int happened\r
415 pv->pending_ints|=0x20;\r
416 if(pv->reg[1]&0x20) SekInterrupt(6);\r
417 if(Pico.m.z80Run && (PicoOpt&4)) // ?\r
418 z80_int();\r
419 //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));\r
420 }\r
421\r
422 // decide if we draw this line\r
423#if CAN_HANDLE_240_LINES\r
424 if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) )\r
425#else\r
426 if(!skip && y<224)\r
427#endif\r
428 PicoLine(y);\r
429\r
430 if(PicoOpt&1)\r
431 sound_timers_and_dac(y);\r
432\r
433 // get samples from sound chips\r
434 if(y == 32 && PsndOut)\r
435 emustatus &= ~1;\r
436 else if((y == 224 || y == line_sample) && PsndOut)\r
437 getSamples(y);\r
438\r
439 // Run scanline:\r
440 if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();\r
441 SekRun(cycles_68k);\r
442 if((PicoOpt&4) && Pico.m.z80Run) {\r
443 Pico.m.z80Run|=2;\r
444 z80CycleAim+=cycles_z80;\r
445 total_z80+=z80_run(z80CycleAim-total_z80);\r
446 }\r
447 }\r
448\r
449 // draw a frame just after vblank in alternative render mode\r
450 if(!PicoSkipFrame && (PicoOpt&0x10))\r
451 PicoFrameFull();\r
452\r
453 return 0;\r
454}\r
455\r
456// helper z80 runner\r
457static void PicoRunZ80Simple(int line_from, int line_to)\r
458{\r
459 int line_from_r=line_from, line_to_r=line_to, line = line_from;\r
460 int line_sample = Pico.m.pal ? 68 : 93;\r
461 extern const unsigned short vcounts[];\r
462\r
463 if(!(PicoOpt&4) || Pico.m.z80Run == 0) { line_from_r = line_to_r; line_to_r = 0; }\r
464\r
465 if(z80startCycle != 0) {\r
466 line_from_r = vcounts[z80startCycle>>8]+1;\r
467 z80startCycle = 0;\r
468 }\r
469 if(z80stopCycle != 0) {\r
470 line_to_r = vcounts[z80stopCycle>>8]+1;\r
471 z80stopCycle = 0;\r
472 }\r
473\r
474 if(PicoOpt&1) {\r
475 // we have ym2612 enabled, so we have to run Z80 in lines, so we could update DAC and timers\r
476 for(; line < line_to; line++) {\r
477 sound_timers_and_dac(line);\r
478 if((line == 224 || line == line_sample) && PsndOut) getSamples(line);\r
479 if(line == 32 && PsndOut) emustatus &= ~1;\r
480 if(line >= line_from_r && line < line_to_r)\r
481 z80_run(228);\r
482 }\r
483 } else if(line_to_r-line_from_r > 0) {\r
484 z80_run(228*(line_to_r-line_from_r));\r
485 // samples will be taken by caller\r
486 }\r
487}\r
488\r
489// Simple frame without H-Ints\r
490static int PicoFrameSimple(void)\r
491{\r
492 struct PicoVideo *pv=&Pico.video;\r
493 int y=0,line=0,lines=0,lines_step=0,sects;\r
494 int cycles_68k_vblock,cycles_68k_block;\r
495\r
496 if(Pico.m.pal) {\r
497 // M68k cycles/frame: 152009.78\r
498 if(pv->reg[1]&8) { // 240 lines\r
499 cycles_68k_block = (int) ((double) OSC_PAL / 7 / 50 / 312 * 15 + 0.4); // 16 sects, 16*15=240, 7308\r
500 cycles_68k_vblock = (int) ((double) OSC_PAL / 7 / 50 / 312 * 24 + 0.4); // 3 sects, 3*24=72, 35163?\r
501 lines_step = 15;\r
502 } else {\r
503 cycles_68k_block = (int) ((double) OSC_PAL / 7 / 50 / 312 * 14 + 0.4); // 16*14=224\r
504 cycles_68k_vblock = (int) ((double) OSC_PAL / 7 / 50 / 312 * 22 + 0.4); // 4 sects, 4*22=88\r
505 lines_step = 14;\r
506 }\r
507 } else {\r
508 // M68k cycles/frame: 127840.71\r
509 cycles_68k_block = (int) ((double) OSC_NTSC / 7 / 60 / 262 * 14 + 0.4); // 16*14=224, 6831\r
510 cycles_68k_vblock = (int) ((double) OSC_NTSC / 7 / 60 / 262 * 19 + 0.4); // 2 sects, 2*19=38, 18544\r
511 lines_step = 14;\r
512 }\r
513\r
514 Pico.m.scanline=-1;\r
515\r
516 SekCyclesReset();\r
517\r
518 if(PicoOpt&4)\r
519 z80_resetCycles();\r
520\r
521 // 6 button pad: let's just say it timed out now\r
522 Pico.m.padTHPhase[0]=Pico.m.padTHPhase[1]=0;\r
523\r
524 // ---- Active Scan ----\r
525 pv->status&=~88; // clear V-Int, come out of vblank\r
526\r
527 // Run in sections:\r
528 for(sects=16; sects; sects--)\r
529 {\r
530 if (CheckIdle()) break;\r
531\r
532 lines += lines_step;\r
533 SekRun(cycles_68k_block);\r
534\r
535 PicoRunZ80Simple(line, lines);\r
536 line=lines;\r
537 }\r
538\r
539 // run Z80 for remaining sections\r
540 if(sects) {\r
541 int c = sects*cycles_68k_block;\r
542\r
543 lines += sects*lines_step;\r
544 PicoRunZ80Simple(line, lines);\r
545 // this is for approriate line counter, etc\r
546 SekCycleCnt += c;\r
547 SekCycleAim += c;\r
548 }\r
549\r
550 // here we render sound if ym2612 is disabled\r
551 if(!(PicoOpt&1) && PsndOut) {\r
552 sound_render(0, PsndLen);\r
553 if(PicoWriteSound) PicoWriteSound();\r
554 // clear sound buffer\r
555 memset(PsndOut, 0, (PicoOpt & 8) ? (PsndLen<<2) : (PsndLen<<1));\r
556 }\r
557\r
558 // render screen\r
559 if(!PicoSkipFrame) {\r
560 if(!(PicoOpt&0x10))\r
561 // Draw the screen\r
562#if CAN_HANDLE_240_LINES\r
563 if(pv->reg[1]&8) {\r
564 for (y=0;y<240;y++) PicoLine(y);\r
565 } else {\r
566 for (y=0;y<224;y++) PicoLine(y);\r
567 }\r
568#else\r
569 for (y=0;y<224;y++) PicoLine(y);\r
570#endif\r
571 else PicoFrameFull();\r
572 }\r
573\r
574 // ---- V-Blanking period ----\r
575 // fix line counts\r
576 if(Pico.m.pal) {\r
577 if(pv->reg[1]&8) { // 240 lines\r
578 lines = line = 240;\r
579 sects = 3;\r
580 lines_step = 24;\r
581 } else {\r
582 lines = line = 224;\r
583 sects = 4;\r
584 lines_step = 22;\r
585 }\r
586 } else {\r
587 lines = line = 224;\r
588 sects = 2;\r
589 lines_step = 19;\r
590 }\r
591\r
592 //dprintf("vint: @ %06x [%i]", SekPc, SekCycleCnt);\r
593 pv->pending_ints|=0x20;\r
594 if (pv->reg[1]&0x20) SekInterrupt(6); // Set IRQ\r
595 pv->status|=0x88; // V-Int happened / go into vblank\r
596 if(Pico.m.z80Run && (PicoOpt&4)) // ?\r
597 z80_int();\r
598\r
599 while(sects) {\r
600 lines += lines_step;\r
601\r
602 SekRun(cycles_68k_vblock);\r
603\r
604 PicoRunZ80Simple(line, lines);\r
605 line=lines;\r
606\r
607 sects--;\r
608 if(sects && CheckIdle()) break;\r
609 }\r
610\r
611 // run Z80 for remaining sections\r
612 if(sects) {\r
613 lines += sects*lines_step;\r
614 PicoRunZ80Simple(line, lines);\r
615 }\r
616\r
617 return 0;\r
618}\r
619\r
620int PicoFrame(void)\r
621{\r
622 int acc;\r
623\r
624 Pico.m.frame_count++;\r
625\r
626 if (PicoMCD & 1) {\r
627 PicoFrameMCD();\r
628 return 0;\r
629 }\r
630\r
631 // be accurate if we are asked for this\r
632 if(PicoOpt&0x40) acc=1;\r
633 // don't be accurate in alternative render mode, as hint effects will not be rendered anyway\r
634 else if(PicoOpt&0x10) acc = 0;\r
635 else acc=Pico.video.reg[0]&0x10; // be accurate if hints are used\r
636\r
637 //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode\r
638\r
639 if(!(PicoOpt&0x10))\r
640 PicoFrameStart();\r
641\r
642 if(acc)\r
643 PicoFrameHints();\r
644 else PicoFrameSimple();\r
645\r
646 return 0;\r
647}\r
648\r
649static int DefaultCram(int cram)\r
650{\r
651 int high=0x0841;\r
652 // Convert 0000bbbb ggggrrrr\r
653 // to rrrr1ggg g10bbbb1\r
654 high|=(cram&0x00f)<<12; // Red\r
655 high|=(cram&0x0f0)<< 3; // Green\r
656 high|=(cram&0xf00)>> 7; // Blue\r
657 return high;\r
658}\r
659\r
660// Function to convert Megadrive Cram into a native colour:\r
661int (*PicoCram)(int cram)=DefaultCram;\r
662\r
663#if defined(__DEBUG_PRINT) || defined(WIN32)\r
664// tmp debug: dump some stuff\r
665#define bit(r, x) ((r>>x)&1)\r
666void z80_debug(char *dstr);\r
667char *debugString()\r
668{\r
669#if 1\r
670 static char dstr[1024];\r
671 unsigned char *reg=Pico.video.reg, r;\r
672\r
673 // dump some info\r
674 sprintf(dstr, "mode set 1: %02x\n", (r=reg[0]));\r
675 sprintf(dstr, "%sdisplay_disable: %i, M3: %i, palette: %i, ?, hints: %i\n\n", dstr, bit(r,0), bit(r,1), bit(r,2), bit(r,4));\r
676 sprintf(dstr, "%smode set 2: %02x\n", dstr, (r=reg[1]));\r
677 sprintf(dstr, "%sSMS/genesis: %i, pal: %i, dma: %i, vints: %i, disp: %i, TMS9918: %i\n\n",dstr, bit(r,2), bit(r,3), bit(r,4), bit(r,5), bit(r,6), bit(r,7));\r
678 sprintf(dstr, "%smode set 3: %02x\n", dstr, (r=reg[0xB]));\r
679 sprintf(dstr, "%sLSCR: %i, HSCR: %i, 2cell vscroll: %i, IE2: %i\n\n", dstr, bit(r,0), bit(r,1), bit(r,2), bit(r,3));\r
680 sprintf(dstr, "%smode set 4: %02x\n", dstr, (r=reg[0xC]));\r
681 sprintf(dstr, "%sinterlace: %i%i; cells: %i; shadow: %i\n\n", dstr, bit(r,2), bit(r,1), (r&0x80) ? 40 : 32, bit(r,3));\r
682 sprintf(dstr, "%sscroll size: w: %i; h: %i\n\n", dstr, reg[0x10]&3, (reg[0x10]&0x30)>>4);\r
683 sprintf(dstr, "%sSRAM: det: %i; eeprom: %i\n", dstr, bit(Pico.m.sram_reg, 4), bit(Pico.m.sram_reg, 2));\r
684 sprintf(dstr, "%sCPU state: PC: %06x cycles: %i\n", dstr, SekPc, SekCyclesDoneT());\r
685#ifdef EMU_C68K\r
686 for(r=0; r < 8; r++)\r
687 sprintf(dstr, "%sd%i=%08x, a%i=%08x\n", dstr, r, PicoCpu.d[r], r, PicoCpu.a[r]);\r
688#endif\r
689 z80_debug(dstr);\r
690\r
691#else\r
692 struct PicoVideo *pvid=&Pico.video;\r
693 int table=0;\r
694 int i,u,n,link=0;\r
695 static char dstr[1024*8];\r
696 dstr[0] = 0;\r
697\r
698 table=pvid->reg[5]&0x7f;\r
699 if (pvid->reg[12]&1) table&=0x7e; // Lowest bit 0 in 40-cell mode\r
700 table<<=8; // Get sprite table address/2\r
701\r
702 for (i=u=n=0; u < 80 && n < 20; u++)\r
703 {\r
704 unsigned int *sprite;\r
705 int code, code2, sx, sy, height;\r
706\r
707 sprite=(unsigned int *)(Pico.vram+((table+(link<<2))&0x7ffc)); // Find sprite\r
708\r
709 // get sprite info\r
710 code = sprite[0];\r
711\r
712 // check if it is on this line\r
713 sy = (code&0x1ff);//-0x80;\r
714 height = ((code>>24)&3)+1;\r
715\r
716 // masking sprite?\r
717 code2 = sprite[1];\r
718 sx = (code2>>16)&0x1ff;\r
719\r
720 dprintf("#%02i x: %03i y: %03i %ix%i", u, sx, sy, ((code>>26)&3)+1, height);\r
721\r
722 link=(code>>16)&0x7f;\r
723 if(!link) break; // End of sprites\r
724 }\r
725#endif\r
726\r
727#if 0\r
728 {\r
729 FILE *f = fopen("zram", "wb");\r
730 fwrite(Pico.zram, 1, 0x2000, f);\r
731 fclose(f);\r
732 }\r
733#endif\r
734\r
735 return dstr;\r
736}\r
737#endif\r