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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 |
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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 |
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12 | \r |
13 | extern const unsigned char hcounts_32[];\r |
14 | extern const unsigned char hcounts_40[];\r |
15 | extern const unsigned short vcounts[];\r |
16 | extern int rendstatus;\r |
17 | \r |
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18 | typedef unsigned char u8;\r |
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19 | typedef unsigned short u16;\r |
20 | \r |
21 | \r |
22 | static __inline void AutoIncrement()\r |
23 | {\r |
24 | Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);\r |
25 | }\r |
26 | \r |
27 | static 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 |
46 | static 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 |
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58 | \r |
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59 | AutoIncrement();\r |
60 | return d;\r |
61 | }\r |
62 | \r |
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63 | static 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 |
75 | static 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 |
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80 | unsigned int source;\r |
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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 |
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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 |
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89 | \r |
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90 | if(Pico.m.scanline != -1) {\r |
91 | Pico.m.dma_bytes += len;\r |
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92 | if ((PicoMCD&1) && (PicoOpt & 0x2000)) SekCycleCnt+=CheckDMA();\r |
93 | else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());\r |
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94 | } else {\r |
95 | // be approximate in non-accurate mode\r |
96 | SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));\r |
97 | }\r |
98 | \r |
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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 |
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103 | dprintf("DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);\r |
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104 | if(source<0x20000) { // Bios area\r |
105 | pd=(u16 *)(Pico_mcd->bios+(source&~1));\r |
106 | pdend=(u16 *)(Pico_mcd->bios+0x20000);\r |
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107 | } else if ((source&0xfc0000)==0x200000) { // Word Ram\r |
108 | source -= 2;\r |
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109 | if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode\r |
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110 | pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));\r |
111 | pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);\r |
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112 | } else {\r |
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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 |
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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 |
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127 | dprintf("DmaSlow FIXME: unsupported src");\r |
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128 | return;\r |
129 | }\r |
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130 | } else {\r |
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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 |
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144 | }\r |
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145 | \r |
146 | switch (Pico.video.type)\r |
147 | {\r |
148 | case 1: // vram\r |
149 | r = Pico.vram;\r |
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150 | if (inc == 2 && !(a&1) && a+len*2 < 0x10000)\r |
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151 | {\r |
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152 | // most used DMA mode\r |
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153 | memcpy16(r + (a>>1), pd, len);\r |
154 | a += len*2;\r |
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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 |
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168 | }\r |
169 | rendstatus|=0x10;\r |
170 | break;\r |
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171 | \r |
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172 | case 3: // cram\r |
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173 | Pico.m.dirtyPal = 1;\r |
174 | r = Pico.cram;\r |
175 | for(a2=a&0x7f; len; len--)\r |
176 | {\r |
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177 | r[a2>>1] = (u16)*pd++; // bit 0 is ignored\r |
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178 | // AutoIncrement\r |
179 | a2+=inc;\r |
180 | // didn't src overlap?\r |
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181 | //if(pd >= pdend) pd-=0x8000;\r |
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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 |
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196 | //if(pd >= pdend) pd-=0x8000;\r |
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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 |
207 | static 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 |
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214 | dprintf("DmaCopy len %i [%i|%i]", len, Pico.m.scanline, SekCyclesDone());\r |
215 | \r |
216 | Pico.m.dma_bytes += len;\r |
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217 | if(Pico.m.scanline != -1)\r |
218 | Pico.video.status|=2; // dma busy\r |
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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 |
239 | static 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 |
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246 | \r |
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247 | len=GetDmaLength();\r |
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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 |
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251 | if(Pico.m.scanline != -1)\r |
252 | Pico.video.status|=2; // dma busy (in accurate mode)\r |
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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 |
277 | static 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 |
291 | static 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 |
311 | void 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 |
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318 | {\r |
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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 |
393 | unsigned int PicoVideoRead(unsigned int a)\r |
394 | {\r |
395 | unsigned int d=0;\r |
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396 | \r |
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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 |
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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 |
471 | end:\r |
472 | \r |
473 | return d;\r |
474 | }\r |