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PCM sound, refactored code940
[picodrive.git] / Pico / VideoPort.c
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cc68a136 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\r
12extern const unsigned char hcounts_32[];\r
13extern const unsigned char hcounts_40[];\r
14extern const unsigned short vcounts[];\r
15extern int rendstatus;\r
16\r
ab0607f7 17typedef unsigned char u8;\r
cc68a136 18typedef unsigned short u16;\r
19\r
20\r
21static __inline void AutoIncrement()\r
22{\r
23 Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);\r
24}\r
25\r
26static void VideoWrite(u16 d)\r
27{\r
28 unsigned int a=Pico.video.addr;\r
29\r
30 switch (Pico.video.type)\r
31 {\r
32 case 1: if(a&1) d=(u16)((d<<8)|(d>>8)); // If address is odd, bytes are swapped (which game needs this?)\r
33 Pico.vram [(a>>1)&0x7fff]=d;\r
34 rendstatus|=0x10; break;\r
35 case 3: Pico.m.dirtyPal = 1;\r
36 //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());\r
37 Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)\r
38 case 5: Pico.vsram[(a>>1)&0x003f]=d; break;\r
39 }\r
40\r
41 //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());\r
42 AutoIncrement();\r
43}\r
44\r
45static unsigned int VideoRead()\r
46{\r
47 unsigned int a=0,d=0;\r
48\r
49 a=Pico.video.addr; a>>=1;\r
50\r
51 switch (Pico.video.type)\r
52 {\r
53 case 0: d=Pico.vram [a&0x7fff]; break;\r
54 case 8: d=Pico.cram [a&0x003f]; break;\r
55 case 4: d=Pico.vsram[a&0x003f]; break;\r
56 }\r
4f672280 57\r
cc68a136 58 AutoIncrement();\r
59 return d;\r
60}\r
61\r
cc68a136 62static int GetDmaLength()\r
63{\r
64 struct PicoVideo *pvid=&Pico.video;\r
65 int len=0;\r
66 // 16-bit words to transfer:\r
67 len =pvid->reg[0x13];\r
68 len|=pvid->reg[0x14]<<8;\r
69 // Charles MacDonald:\r
70 if(!len) len = 0xffff;\r
71 return len;\r
72}\r
73\r
74static void DmaSlow(int len)\r
75{\r
76 u16 *pd=0, *pdend, *r;\r
77 unsigned int a=Pico.video.addr, a2, d;\r
78 unsigned char inc=Pico.video.reg[0xf];\r
672ad671 79 unsigned int source;\r
cc68a136 80\r
81 source =Pico.video.reg[0x15]<<1;\r
82 source|=Pico.video.reg[0x16]<<9;\r
83 source|=Pico.video.reg[0x17]<<17;\r
84\r
312e9ce1 85 dprintf("DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i|%i] @ %x",\r
86 Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),\r
87 Pico.m.scanline, SekCyclesDone(), SekPc);\r
cc68a136 88\r
672ad671 89 if(Pico.m.scanline != -1) {\r
90 Pico.m.dma_bytes += len;\r
91 SekSetCyclesLeft(SekCyclesLeft - CheckDMA());\r
92 } else {\r
93 // be approximate in non-accurate mode\r
94 SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));\r
95 }\r
96\r
ab0607f7 97 if ((source&0xe00000)==0xe00000) { // Ram\r
98 pd=(u16 *)(Pico.ram+(source&0xfffe));\r
99 pdend=(u16 *)(Pico.ram+0x10000);\r
100 } else if(PicoMCD & 1) {\r
101 dprintf("DmaSlow CD");\r
102 if(source<0x20000) { // Bios area\r
103 pd=(u16 *)(Pico_mcd->bios+(source&~1));\r
104 pdend=(u16 *)(Pico_mcd->bios+0x20000);\r
105 } else if ((source&0xfc0000)==0x200000 && (!(Pico_mcd->s68k_regs[3]&4))) { // Word Ram\r
106 if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode\r
107 pd=(u16 *)(Pico_mcd->word_ram+(source&0x3fffe));\r
108 pdend=(u16 *)(Pico_mcd->word_ram+0x40000);\r
109 } else {\r
110 dprintf("DmaSlow: unsupported src");\r
111 return;\r
112 }\r
113 } else if ((source&0xfe0000)==0x020000) { // Prg Ram\r
114 u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
115 pd=(u16 *)(prg_ram+(source&0x1fffe));\r
116 pdend=(u16 *)(prg_ram+0x20000);\r
117 } else {\r
118 dprintf("DmaSlow: unsupported src");\r
119 return;\r
120 }\r
672ad671 121 } else {\r
ab0607f7 122 if(source<Pico.romsize) { // Rom\r
123 pd=(u16 *)(Pico.rom+(source&~1));\r
124 pdend=(u16 *)(Pico.rom+Pico.romsize);\r
125 } else {\r
126 dprintf("DmaSlow: invalid dma src");\r
127 return;\r
128 }\r
129 }\r
130\r
131 // overflow protection, might break something..\r
132 if (len > pdend - pd) {\r
133 len = pdend - pd;\r
134 dprintf("DmaSlow overflow");\r
672ad671 135 }\r
cc68a136 136\r
137 switch (Pico.video.type)\r
138 {\r
139 case 1: // vram\r
140 r = Pico.vram;\r
141 for(; len; len--)\r
142 {\r
143 d=*pd++;\r
144 if(a&1) d=(d<<8)|(d>>8);\r
145 r[a>>1] = (u16)d; // will drop the upper bits\r
146 // AutoIncrement\r
147 a=(u16)(a+inc);\r
148 // didn't src overlap?\r
ab0607f7 149 //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM\r
cc68a136 150 }\r
151 rendstatus|=0x10;\r
152 break;\r
4f672280 153\r
cc68a136 154 case 3: // cram\r
cc68a136 155 Pico.m.dirtyPal = 1;\r
156 r = Pico.cram;\r
157 for(a2=a&0x7f; len; len--)\r
158 {\r
159 r[a2>>1] = (u16)*pd++;; // bit 0 is ignored\r
160 // AutoIncrement\r
161 a2+=inc;\r
162 // didn't src overlap?\r
ab0607f7 163 //if(pd >= pdend) pd-=0x8000;\r
cc68a136 164 // good dest?\r
165 if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis\r
166 }\r
167 a=(a&0xff00)|a2;\r
168 break;\r
169\r
170 case 5: // vsram[a&0x003f]=d;\r
171 r = Pico.vsram;\r
172 for(a2=a&0x7f; len; len--)\r
173 {\r
174 r[a2>>1] = (u16)*pd++;\r
175 // AutoIncrement\r
176 a2+=inc;\r
177 // didn't src overlap?\r
ab0607f7 178 //if(pd >= pdend) pd-=0x8000;\r
cc68a136 179 // good dest?\r
180 if(a2 >= 0x80) break;\r
181 }\r
182 a=(a&0xff00)|a2;\r
183 break;\r
184 }\r
185 // remember addr\r
186 Pico.video.addr=(u16)a;\r
187}\r
188\r
189static void DmaCopy(int len)\r
190{\r
191 u16 a=Pico.video.addr;\r
192 unsigned char *vr = (unsigned char *) Pico.vram;\r
193 unsigned char *vrs;\r
194 unsigned char inc=Pico.video.reg[0xf];\r
195 int source;\r
4f672280 196 dprintf("DmaCopy len %i [%i|%i]", len, Pico.m.scanline, SekCyclesDone());\r
197\r
198 Pico.m.dma_bytes += len;\r
8c1952f0 199 if(Pico.m.scanline != -1)\r
200 Pico.video.status|=2; // dma busy\r
cc68a136 201\r
202 source =Pico.video.reg[0x15];\r
203 source|=Pico.video.reg[0x16]<<8;\r
204 vrs=vr+source;\r
205\r
206 if(source+len > 0x10000) len=0x10000-source; // clip??\r
207\r
208 for(;len;len--)\r
209 {\r
210 vr[a] = *vrs++;\r
211 // AutoIncrement\r
212 a=(u16)(a+inc);\r
213 }\r
214 // remember addr\r
215 Pico.video.addr=a;\r
216 rendstatus|=0x10;\r
217}\r
218\r
219// check: Contra, Megaman\r
220// note: this is still inaccurate\r
221static void DmaFill(int data)\r
222{\r
223 int len;\r
224 unsigned short a=Pico.video.addr;\r
225 unsigned char *vr=(unsigned char *) Pico.vram;\r
226 unsigned char high = (unsigned char) (data >> 8);\r
227 unsigned char inc=Pico.video.reg[0xf];\r
4f672280 228\r
cc68a136 229 len=GetDmaLength();\r
4f672280 230 dprintf("DmaFill len %i inc %i [%i|%i]", len, inc, Pico.m.scanline, SekCyclesDone());\r
231\r
232 Pico.m.dma_bytes += len;\r
8c1952f0 233 if(Pico.m.scanline != -1)\r
234 Pico.video.status|=2; // dma busy (in accurate mode)\r
cc68a136 235\r
236 // from Charles MacDonald's genvdp.txt:\r
237 // Write lower byte to address specified\r
238 vr[a] = (unsigned char) data;\r
239 a=(u16)(a+inc);\r
240\r
241 if(!inc) len=1;\r
242\r
243 for(;len;len--) {\r
244 // Write upper byte to adjacent address\r
245 // (here we are byteswapped, so address is already 'adjacent')\r
246 vr[a] = high;\r
247\r
248 // Increment address register\r
249 a=(u16)(a+inc);\r
250 }\r
251 // remember addr\r
252 Pico.video.addr=a;\r
253 // update length\r
254 Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)\r
255\r
256 rendstatus|=0x10;\r
257}\r
258\r
259static void CommandDma()\r
260{\r
261 struct PicoVideo *pvid=&Pico.video;\r
262 int len=0,method=0;\r
263\r
264 if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled\r
265\r
266 len=GetDmaLength();\r
267\r
268 method=pvid->reg[0x17]>>6;\r
269 if (method< 2) DmaSlow(len); // 68000 to VDP\r
270 if (method==3) DmaCopy(len); // VRAM Copy\r
271}\r
272\r
273static void CommandChange()\r
274{\r
275 struct PicoVideo *pvid=&Pico.video;\r
276 unsigned int cmd=0,addr=0;\r
277\r
278 cmd=pvid->command;\r
279\r
280 // Get type of transfer 0xc0000030 (v/c/vsram read/write)\r
281 pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));\r
282\r
283 // Get address 0x3fff0003\r
284 addr =(cmd>>16)&0x3fff;\r
285 addr|=(cmd<<14)&0xc000;\r
286 pvid->addr=(unsigned short)addr;\r
287 //dprintf("addr set: %04x", addr);\r
288\r
289 // Check for dma:\r
290 if (cmd&0x80) CommandDma();\r
291}\r
292\r
293void PicoVideoWrite(unsigned int a,unsigned short d)\r
294{\r
295 struct PicoVideo *pvid=&Pico.video;\r
296\r
297 a&=0x1c;\r
298\r
299 if (a==0x00) // Data port 0 or 2\r
4f672280 300 {\r
cc68a136 301 if (pvid->pending) CommandChange();\r
302 pvid->pending=0;\r
303\r
304 // If a DMA fill has been set up, do it\r
305 if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)\r
306 {\r
307 DmaFill(d);\r
308 }\r
309 else\r
310 {\r
311 VideoWrite(d);\r
312 }\r
313 return;\r
314 }\r
315\r
316 if (a==0x04) // Control (command) port 4 or 6\r
317 {\r
318 //dprintf("vdp cw(%04x), p=%i @ %06x [%i]", d, pvid->pending, SekPc, SekCyclesDone());\r
319 if(pvid->pending)\r
320 {\r
321 // Low word of command:\r
322 pvid->command&=0xffff0000;\r
323 pvid->command|=d;\r
324 pvid->pending=0;\r
325 CommandChange();\r
326 } else {\r
327 if((d&0xc000)==0x8000)\r
328 {\r
329 // Register write:\r
330 int num=(d>>8)&0x1f;\r
312e9ce1 331 if(num==00) dprintf("hint_onoff: %i->%i [%i|%i] pend=%i @ %06x", (pvid->reg[0]&0x10)>>4, (d&0x10)>>4, Pico.m.scanline, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);\r
332 if(num==01) dprintf("vint_onoff: %i->%i [%i|%i] pend=%i @ %06x", (pvid->reg[1]&0x20)>>5, (d&0x20)>>5, Pico.m.scanline, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);\r
cc68a136 333 //if(num==01) dprintf("set_blank: %i @ %06x [%i|%i]", !((d&0x40)>>6), SekPc, Pico.m.scanline, SekCyclesDone());\r
334 //if(num==05) dprintf("spr_set: %i @ %06x [%i|%i]", (unsigned char)d, SekPc, Pico.m.scanline, SekCyclesDone());\r
335 //if(num==10) dprintf("hint_set: %i @ %06x [%i|%i]", (unsigned char)d, SekPc, Pico.m.scanline, SekCyclesDone());\r
336 pvid->reg[num]=(unsigned char)d;\r
337#if !(defined(EMU_C68K) && defined(EMU_M68K)) // not debugging Cyclone\r
338 // update IRQ level (Lemmings, Wiz 'n' Liz intro, ... )\r
339 // may break if done improperly:\r
340 // International Superstar Soccer Deluxe (crash), Street Racer (logos), Burning Force (gfx), Fatal Rewind (hang), Sesame Street Counting Cafe\r
341 if(num < 2) {\r
342#ifdef EMU_C68K\r
343 // hack: make sure we do not touch the irq line if Cyclone is just about to take the IRQ\r
344 if (PicoCpu.irq <= (PicoCpu.srh&7)) {\r
345#endif\r
346 int lines, pints;\r
347 lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);\r
348 pints = (pvid->pending_ints&lines);\r
349 if(pints & 0x20) SekInterrupt(6);\r
350 else if(pints & 0x10) SekInterrupt(4);\r
351 else SekInterrupt(0);\r
352#ifdef EMU_C68K\r
353 // adjust cycles for Cyclone so it would take the int "in time"\r
354 if(PicoCpu.irq) {\r
355 SekEndRun(24);\r
356 }\r
357 }\r
358#endif\r
359 }\r
360 else\r
361#endif\r
362 if(num == 5) rendstatus|=1;\r
363 else if(num == 0xc) Pico.m.dirtyPal = 2; // renderers should update their palettes if sh/hi mode is changed\r
364 pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)\r
365 } else {\r
366 // High word of command:\r
367 pvid->command&=0x0000ffff;\r
368 pvid->command|=d<<16;\r
369 pvid->pending=1;\r
370 }\r
371 }\r
372 }\r
373}\r
374\r
375unsigned int PicoVideoRead(unsigned int a)\r
376{\r
377 unsigned int d=0;\r
4f672280 378\r
cc68a136 379 a&=0x1c;\r
380\r
381 if (a==0x00) // data port\r
382 {\r
383 d=VideoRead();\r
384 goto end;\r
385 }\r
386\r
387 if (a==0x04) // control port\r
388 {\r
cc68a136 389 d=Pico.video.status;\r
390 if(PicoOpt&0x10) d|=0x0020; // sprite collision (Shadow of the Beast)\r
391 if(Pico.m.rotate++&8) d|=0x0100; else d|=0x0200; // Toggle fifo full empty (who uses that stuff?)\r
392 if(!(Pico.video.reg[1]&0x40)) d|=0x0008; // set V-Blank if display is disabled\r
393 if(SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs)\r
bf098bc5 394 // dprintf("sr_read %04x @ %06x [%i|%i]", d, SekPc, Pico.m.scanline, SekCyclesDone());\r
cc68a136 395\r
396 Pico.video.pending=0; // ctrl port reads clear write-pending flag (Charles MacDonald)\r
397\r
398 goto end;\r
399 }\r
400\r
401 // H-counter info (based on Generator):\r
402 // frame:\r
403 // | <- hblank? -> |\r
404 // start <416> hint <36> hdisplay <38> end // CPU cycles\r
405 // |---------...---------|------------|-------------|\r
406 // 0 B6 E4 FF // 40 cells\r
407 // 0 93 E8 FF // 32 cells\r
408\r
409 // Gens (?) v-render\r
410 // start <hblank=84> hint hdisplay <404> |\r
411 // |---------------------|--------------------------|\r
412 // E4 (hc[0x43]==0) 07 B1 // 40\r
413 // E8 (hc[0x45]==0) 05 91 // 32\r
4f672280 414\r
cc68a136 415 // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune\r
416 if ((a&0x1c)==0x08)\r
417 {\r
418 unsigned int hc;\r
419\r
420 if(Pico.m.scanline != -1) {\r
421 int lineCycles=(488-SekCyclesLeft)&0x1ff;\r
422 d=Pico.m.scanline; // V-Counter\r
423\r
424 if(Pico.video.reg[12]&1)\r
425 hc=hcounts_40[lineCycles];\r
426 else hc=hcounts_32[lineCycles];\r
427\r
8c1952f0 428 //if(lineCycles > 488-12) d++; // Wheel of Fortune\r
cc68a136 429 } else {\r
430 // get approximate V-Counter\r
431 d=vcounts[SekCyclesDone()>>8];\r
432 hc = Pico.m.rotate&0xff;\r
433 }\r
434\r
435 if(Pico.m.pal) {\r
436 if(d >= 0x103) d-=56; // based on Gens\r
437 } else {\r
438 if(d >= 0xEB) d-=6;\r
439 }\r
440\r
441 if((Pico.video.reg[12]&6) == 6) {\r
442 // interlace mode 2 (Combat Cars (UE) [!])\r
443 d <<= 1;\r
444 if (d&0xf00) d|= 1;\r
445 }\r
446\r
4f672280 447 dprintf("hv: %02x %02x (%i) @ %06x", hc, d, SekCyclesDone(), SekPc);\r
cc68a136 448 d&=0xff; d<<=8;\r
449 d|=hc;\r
450 goto end;\r
451 }\r
452\r
453end:\r
454\r
455 return d;\r
456}\r
fast MegaDrive/MegaCD/32X emulator