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