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