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some skin adjustments
[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
6cadc2da 4// (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas\r
cc68a136 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
fa1e5e29 11#include "cd/gfx_cd.h"\r
cc68a136 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
ab0607f7 18typedef unsigned char u8;\r
cc68a136 19typedef unsigned short u16;\r
20\r
21\r
22static __inline void AutoIncrement()\r
23{\r
24 Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);\r
25}\r
26\r
27static void VideoWrite(u16 d)\r
28{\r
29 unsigned int a=Pico.video.addr;\r
30\r
31 switch (Pico.video.type)\r
32 {\r
33 case 1: if(a&1) d=(u16)((d<<8)|(d>>8)); // If address is odd, bytes are swapped (which game needs this?)\r
34 Pico.vram [(a>>1)&0x7fff]=d;\r
35 rendstatus|=0x10; break;\r
36 case 3: Pico.m.dirtyPal = 1;\r
37 //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());\r
38 Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)\r
39 case 5: Pico.vsram[(a>>1)&0x003f]=d; break;\r
40 }\r
41\r
42 //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());\r
43 AutoIncrement();\r
44}\r
45\r
46static unsigned int VideoRead()\r
47{\r
48 unsigned int a=0,d=0;\r
49\r
50 a=Pico.video.addr; a>>=1;\r
51\r
52 switch (Pico.video.type)\r
53 {\r
54 case 0: d=Pico.vram [a&0x7fff]; break;\r
55 case 8: d=Pico.cram [a&0x003f]; break;\r
56 case 4: d=Pico.vsram[a&0x003f]; break;\r
57 }\r
4f672280 58\r
cc68a136 59 AutoIncrement();\r
60 return d;\r
61}\r
62\r
cc68a136 63static int GetDmaLength()\r
64{\r
65 struct PicoVideo *pvid=&Pico.video;\r
66 int len=0;\r
67 // 16-bit words to transfer:\r
68 len =pvid->reg[0x13];\r
69 len|=pvid->reg[0x14]<<8;\r
70 // Charles MacDonald:\r
71 if(!len) len = 0xffff;\r
72 return len;\r
73}\r
74\r
75static void DmaSlow(int len)\r
76{\r
77 u16 *pd=0, *pdend, *r;\r
78 unsigned int a=Pico.video.addr, a2, d;\r
79 unsigned char inc=Pico.video.reg[0xf];\r
672ad671 80 unsigned int source;\r
cc68a136 81\r
82 source =Pico.video.reg[0x15]<<1;\r
83 source|=Pico.video.reg[0x16]<<9;\r
84 source|=Pico.video.reg[0x17]<<17;\r
85\r
312e9ce1 86 dprintf("DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i|%i] @ %x",\r
87 Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),\r
88 Pico.m.scanline, SekCyclesDone(), SekPc);\r
cc68a136 89\r
672ad671 90 if(Pico.m.scanline != -1) {\r
91 Pico.m.dma_bytes += len;\r
2d0b15bb 92 if ((PicoMCD&1) && (PicoOpt & 0x2000)) SekCyclesBurn(CheckDMA());\r
7336a99a 93 else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());\r
672ad671 94 } else {\r
95 // be approximate in non-accurate mode\r
96 SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));\r
97 }\r
98\r
ab0607f7 99 if ((source&0xe00000)==0xe00000) { // Ram\r
100 pd=(u16 *)(Pico.ram+(source&0xfffe));\r
101 pdend=(u16 *)(Pico.ram+0x10000);\r
102 } else if(PicoMCD & 1) {\r
fa1e5e29 103 dprintf("DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);\r
ab0607f7 104 if(source<0x20000) { // Bios area\r
105 pd=(u16 *)(Pico_mcd->bios+(source&~1));\r
106 pdend=(u16 *)(Pico_mcd->bios+0x20000);\r
fa1e5e29 107 } else if ((source&0xfc0000)==0x200000) { // Word Ram\r
108 source -= 2;\r
ab0607f7 109 if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode\r
fa1e5e29 110 pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));\r
111 pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);\r
ab0607f7 112 } else {\r
fa1e5e29 113 if (source < 0x220000) { // 1M mode\r
114 int bank = Pico_mcd->s68k_regs[3]&1;\r
115 pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));\r
116 pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);\r
117 } else {\r
118 DmaSlowCell(source, a, len, inc);\r
119 return;\r
120 }\r
ab0607f7 121 }\r
122 } else if ((source&0xfe0000)==0x020000) { // Prg Ram\r
123 u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
124 pd=(u16 *)(prg_ram+(source&0x1fffe));\r
125 pdend=(u16 *)(prg_ram+0x20000);\r
126 } else {\r
fa1e5e29 127 dprintf("DmaSlow FIXME: unsupported src");\r
ab0607f7 128 return;\r
129 }\r
672ad671 130 } else {\r
ab0607f7 131 if(source<Pico.romsize) { // Rom\r
132 pd=(u16 *)(Pico.rom+(source&~1));\r
133 pdend=(u16 *)(Pico.rom+Pico.romsize);\r
134 } else {\r
135 dprintf("DmaSlow: invalid dma src");\r
136 return;\r
137 }\r
138 }\r
139\r
140 // overflow protection, might break something..\r
141 if (len > pdend - pd) {\r
142 len = pdend - pd;\r
143 dprintf("DmaSlow overflow");\r
672ad671 144 }\r
cc68a136 145\r
146 switch (Pico.video.type)\r
147 {\r
148 case 1: // vram\r
149 r = Pico.vram;\r
cea65903 150 if (inc == 2 && !(a&1) && a+len*2 < 0x10000)\r
cc68a136 151 {\r
cea65903 152 // most used DMA mode\r
fa1e5e29 153 memcpy16(r + (a>>1), pd, len);\r
154 a += len*2;\r
cea65903 155 }\r
156 else\r
157 {\r
158 for(; len; len--)\r
159 {\r
160 d=*pd++;\r
161 if(a&1) d=(d<<8)|(d>>8);\r
162 r[a>>1] = (u16)d; // will drop the upper bits\r
163 // AutoIncrement\r
164 a=(u16)(a+inc);\r
165 // didn't src overlap?\r
166 //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM\r
167 }\r
cc68a136 168 }\r
169 rendstatus|=0x10;\r
170 break;\r
4f672280 171\r
cc68a136 172 case 3: // cram\r
cc68a136 173 Pico.m.dirtyPal = 1;\r
174 r = Pico.cram;\r
175 for(a2=a&0x7f; len; len--)\r
176 {\r
0a051f55 177 r[a2>>1] = (u16)*pd++; // bit 0 is ignored\r
cc68a136 178 // AutoIncrement\r
179 a2+=inc;\r
180 // didn't src overlap?\r
ab0607f7 181 //if(pd >= pdend) pd-=0x8000;\r
cc68a136 182 // good dest?\r
183 if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis\r
184 }\r
185 a=(a&0xff00)|a2;\r
186 break;\r
187\r
188 case 5: // vsram[a&0x003f]=d;\r
189 r = Pico.vsram;\r
190 for(a2=a&0x7f; len; len--)\r
191 {\r
192 r[a2>>1] = (u16)*pd++;\r
193 // AutoIncrement\r
194 a2+=inc;\r
195 // didn't src overlap?\r
ab0607f7 196 //if(pd >= pdend) pd-=0x8000;\r
cc68a136 197 // good dest?\r
198 if(a2 >= 0x80) break;\r
199 }\r
200 a=(a&0xff00)|a2;\r
201 break;\r
202 }\r
203 // remember addr\r
204 Pico.video.addr=(u16)a;\r
205}\r
206\r
207static void DmaCopy(int len)\r
208{\r
209 u16 a=Pico.video.addr;\r
210 unsigned char *vr = (unsigned char *) Pico.vram;\r
211 unsigned char *vrs;\r
212 unsigned char inc=Pico.video.reg[0xf];\r
213 int source;\r
4f672280 214 dprintf("DmaCopy len %i [%i|%i]", len, Pico.m.scanline, SekCyclesDone());\r
215\r
216 Pico.m.dma_bytes += len;\r
8c1952f0 217 if(Pico.m.scanline != -1)\r
218 Pico.video.status|=2; // dma busy\r
cc68a136 219\r
220 source =Pico.video.reg[0x15];\r
221 source|=Pico.video.reg[0x16]<<8;\r
222 vrs=vr+source;\r
223\r
224 if(source+len > 0x10000) len=0x10000-source; // clip??\r
225\r
226 for(;len;len--)\r
227 {\r
228 vr[a] = *vrs++;\r
229 // AutoIncrement\r
230 a=(u16)(a+inc);\r
231 }\r
232 // remember addr\r
233 Pico.video.addr=a;\r
234 rendstatus|=0x10;\r
235}\r
236\r
237// check: Contra, Megaman\r
238// note: this is still inaccurate\r
239static void DmaFill(int data)\r
240{\r
241 int len;\r
242 unsigned short a=Pico.video.addr;\r
243 unsigned char *vr=(unsigned char *) Pico.vram;\r
244 unsigned char high = (unsigned char) (data >> 8);\r
245 unsigned char inc=Pico.video.reg[0xf];\r
4f672280 246\r
cc68a136 247 len=GetDmaLength();\r
4f672280 248 dprintf("DmaFill len %i inc %i [%i|%i]", len, inc, Pico.m.scanline, SekCyclesDone());\r
249\r
250 Pico.m.dma_bytes += len;\r
8c1952f0 251 if(Pico.m.scanline != -1)\r
252 Pico.video.status|=2; // dma busy (in accurate mode)\r
cc68a136 253\r
254 // from Charles MacDonald's genvdp.txt:\r
255 // Write lower byte to address specified\r
256 vr[a] = (unsigned char) data;\r
257 a=(u16)(a+inc);\r
258\r
259 if(!inc) len=1;\r
260\r
261 for(;len;len--) {\r
262 // Write upper byte to adjacent address\r
263 // (here we are byteswapped, so address is already 'adjacent')\r
264 vr[a] = high;\r
265\r
266 // Increment address register\r
267 a=(u16)(a+inc);\r
268 }\r
269 // remember addr\r
270 Pico.video.addr=a;\r
271 // update length\r
272 Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)\r
273\r
274 rendstatus|=0x10;\r
275}\r
276\r
277static void CommandDma()\r
278{\r
279 struct PicoVideo *pvid=&Pico.video;\r
280 int len=0,method=0;\r
281\r
282 if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled\r
283\r
284 len=GetDmaLength();\r
285\r
286 method=pvid->reg[0x17]>>6;\r
287 if (method< 2) DmaSlow(len); // 68000 to VDP\r
288 if (method==3) DmaCopy(len); // VRAM Copy\r
289}\r
290\r
291static void CommandChange()\r
292{\r
293 struct PicoVideo *pvid=&Pico.video;\r
294 unsigned int cmd=0,addr=0;\r
295\r
296 cmd=pvid->command;\r
297\r
298 // Get type of transfer 0xc0000030 (v/c/vsram read/write)\r
299 pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));\r
300\r
301 // Get address 0x3fff0003\r
302 addr =(cmd>>16)&0x3fff;\r
303 addr|=(cmd<<14)&0xc000;\r
304 pvid->addr=(unsigned short)addr;\r
305 //dprintf("addr set: %04x", addr);\r
306\r
307 // Check for dma:\r
308 if (cmd&0x80) CommandDma();\r
309}\r
310\r
311void PicoVideoWrite(unsigned int a,unsigned short d)\r
312{\r
313 struct PicoVideo *pvid=&Pico.video;\r
314\r
315 a&=0x1c;\r
316\r
317 if (a==0x00) // Data port 0 or 2\r
4f672280 318 {\r
cc68a136 319 if (pvid->pending) CommandChange();\r
320 pvid->pending=0;\r
321\r
322 // If a DMA fill has been set up, do it\r
323 if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)\r
324 {\r
325 DmaFill(d);\r
326 }\r
327 else\r
328 {\r
329 VideoWrite(d);\r
330 }\r
331 return;\r
332 }\r
333\r
334 if (a==0x04) // Control (command) port 4 or 6\r
335 {\r
336 //dprintf("vdp cw(%04x), p=%i @ %06x [%i]", d, pvid->pending, SekPc, SekCyclesDone());\r
337 if(pvid->pending)\r
338 {\r
339 // Low word of command:\r
340 pvid->command&=0xffff0000;\r
341 pvid->command|=d;\r
342 pvid->pending=0;\r
343 CommandChange();\r
344 } else {\r
345 if((d&0xc000)==0x8000)\r
346 {\r
347 // Register write:\r
348 int num=(d>>8)&0x1f;\r
312e9ce1 349 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
350 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 351 //if(num==01) dprintf("set_blank: %i @ %06x [%i|%i]", !((d&0x40)>>6), SekPc, Pico.m.scanline, SekCyclesDone());\r
352 //if(num==05) dprintf("spr_set: %i @ %06x [%i|%i]", (unsigned char)d, SekPc, Pico.m.scanline, SekCyclesDone());\r
353 //if(num==10) dprintf("hint_set: %i @ %06x [%i|%i]", (unsigned char)d, SekPc, Pico.m.scanline, SekCyclesDone());\r
354 pvid->reg[num]=(unsigned char)d;\r
355#if !(defined(EMU_C68K) && defined(EMU_M68K)) // not debugging Cyclone\r
356 // update IRQ level (Lemmings, Wiz 'n' Liz intro, ... )\r
357 // may break if done improperly:\r
358 // International Superstar Soccer Deluxe (crash), Street Racer (logos), Burning Force (gfx), Fatal Rewind (hang), Sesame Street Counting Cafe\r
359 if(num < 2) {\r
360#ifdef EMU_C68K\r
361 // hack: make sure we do not touch the irq line if Cyclone is just about to take the IRQ\r
362 if (PicoCpu.irq <= (PicoCpu.srh&7)) {\r
363#endif\r
364 int lines, pints;\r
365 lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);\r
366 pints = (pvid->pending_ints&lines);\r
367 if(pints & 0x20) SekInterrupt(6);\r
368 else if(pints & 0x10) SekInterrupt(4);\r
369 else SekInterrupt(0);\r
370#ifdef EMU_C68K\r
371 // adjust cycles for Cyclone so it would take the int "in time"\r
372 if(PicoCpu.irq) {\r
373 SekEndRun(24);\r
374 }\r
375 }\r
376#endif\r
377 }\r
378 else\r
379#endif\r
380 if(num == 5) rendstatus|=1;\r
381 else if(num == 0xc) Pico.m.dirtyPal = 2; // renderers should update their palettes if sh/hi mode is changed\r
382 pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)\r
383 } else {\r
384 // High word of command:\r
385 pvid->command&=0x0000ffff;\r
386 pvid->command|=d<<16;\r
387 pvid->pending=1;\r
388 }\r
389 }\r
390 }\r
391}\r
392\r
393unsigned int PicoVideoRead(unsigned int a)\r
394{\r
395 unsigned int d=0;\r
4f672280 396\r
cc68a136 397 a&=0x1c;\r
398\r
399 if (a==0x00) // data port\r
400 {\r
401 d=VideoRead();\r
402 goto end;\r
403 }\r
404\r
405 if (a==0x04) // control port\r
406 {\r
cc68a136 407 d=Pico.video.status;\r
408 if(PicoOpt&0x10) d|=0x0020; // sprite collision (Shadow of the Beast)\r
409 if(Pico.m.rotate++&8) d|=0x0100; else d|=0x0200; // Toggle fifo full empty (who uses that stuff?)\r
410 if(!(Pico.video.reg[1]&0x40)) d|=0x0008; // set V-Blank if display is disabled\r
411 if(SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs)\r
bf098bc5 412 // dprintf("sr_read %04x @ %06x [%i|%i]", d, SekPc, Pico.m.scanline, SekCyclesDone());\r
cc68a136 413\r
414 Pico.video.pending=0; // ctrl port reads clear write-pending flag (Charles MacDonald)\r
415\r
416 goto end;\r
417 }\r
418\r
419 // H-counter info (based on Generator):\r
420 // frame:\r
421 // | <- hblank? -> |\r
422 // start <416> hint <36> hdisplay <38> end // CPU cycles\r
423 // |---------...---------|------------|-------------|\r
424 // 0 B6 E4 FF // 40 cells\r
425 // 0 93 E8 FF // 32 cells\r
426\r
427 // Gens (?) v-render\r
428 // start <hblank=84> hint hdisplay <404> |\r
429 // |---------------------|--------------------------|\r
430 // E4 (hc[0x43]==0) 07 B1 // 40\r
431 // E8 (hc[0x45]==0) 05 91 // 32\r
4f672280 432\r
cc68a136 433 // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune\r
434 if ((a&0x1c)==0x08)\r
435 {\r
436 unsigned int hc;\r
437\r
438 if(Pico.m.scanline != -1) {\r
439 int lineCycles=(488-SekCyclesLeft)&0x1ff;\r
440 d=Pico.m.scanline; // V-Counter\r
441\r
442 if(Pico.video.reg[12]&1)\r
443 hc=hcounts_40[lineCycles];\r
444 else hc=hcounts_32[lineCycles];\r
445\r
8c1952f0 446 //if(lineCycles > 488-12) d++; // Wheel of Fortune\r
cc68a136 447 } else {\r
448 // get approximate V-Counter\r
449 d=vcounts[SekCyclesDone()>>8];\r
450 hc = Pico.m.rotate&0xff;\r
451 }\r
452\r
453 if(Pico.m.pal) {\r
454 if(d >= 0x103) d-=56; // based on Gens\r
455 } else {\r
456 if(d >= 0xEB) d-=6;\r
457 }\r
458\r
459 if((Pico.video.reg[12]&6) == 6) {\r
460 // interlace mode 2 (Combat Cars (UE) [!])\r
461 d <<= 1;\r
462 if (d&0xf00) d|= 1;\r
463 }\r
464\r
4f672280 465 dprintf("hv: %02x %02x (%i) @ %06x", hc, d, SekCyclesDone(), SekPc);\r
cc68a136 466 d&=0xff; d<<=8;\r
467 d|=hc;\r
468 goto end;\r
469 }\r
470\r
471end:\r
472\r
473 return d;\r
474}\r
fast MegaDrive/MegaCD/32X emulator