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