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 |
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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 |
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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 | #ifndef UTYPES_DEFINED\r |
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19 | typedef unsigned char u8;\r |
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20 | typedef unsigned short u16;\r |
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21 | typedef unsigned int u32;\r |
22 | #define UTYPES_DEFINED\r |
23 | #endif\r |
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24 | \r |
25 | \r |
26 | static __inline void AutoIncrement()\r |
27 | {\r |
28 | Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);\r |
29 | }\r |
30 | \r |
31 | static void VideoWrite(u16 d)\r |
32 | {\r |
33 | unsigned int a=Pico.video.addr;\r |
34 | \r |
35 | switch (Pico.video.type)\r |
36 | {\r |
37 | case 1: if(a&1) d=(u16)((d<<8)|(d>>8)); // If address is odd, bytes are swapped (which game needs this?)\r |
38 | Pico.vram [(a>>1)&0x7fff]=d;\r |
39 | rendstatus|=0x10; break;\r |
40 | case 3: Pico.m.dirtyPal = 1;\r |
41 | //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());\r |
42 | Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)\r |
43 | case 5: Pico.vsram[(a>>1)&0x003f]=d; break;\r |
44 | }\r |
45 | \r |
46 | //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());\r |
47 | AutoIncrement();\r |
48 | }\r |
49 | \r |
50 | static unsigned int VideoRead()\r |
51 | {\r |
52 | unsigned int a=0,d=0;\r |
53 | \r |
54 | a=Pico.video.addr; a>>=1;\r |
55 | \r |
56 | switch (Pico.video.type)\r |
57 | {\r |
58 | case 0: d=Pico.vram [a&0x7fff]; break;\r |
59 | case 8: d=Pico.cram [a&0x003f]; break;\r |
60 | case 4: d=Pico.vsram[a&0x003f]; break;\r |
61 | }\r |
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62 | \r |
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63 | AutoIncrement();\r |
64 | return d;\r |
65 | }\r |
66 | \r |
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67 | static int GetDmaLength()\r |
68 | {\r |
69 | struct PicoVideo *pvid=&Pico.video;\r |
70 | int len=0;\r |
71 | // 16-bit words to transfer:\r |
72 | len =pvid->reg[0x13];\r |
73 | len|=pvid->reg[0x14]<<8;\r |
74 | // Charles MacDonald:\r |
75 | if(!len) len = 0xffff;\r |
76 | return len;\r |
77 | }\r |
78 | \r |
79 | static void DmaSlow(int len)\r |
80 | {\r |
81 | u16 *pd=0, *pdend, *r;\r |
82 | unsigned int a=Pico.video.addr, a2, d;\r |
83 | unsigned char inc=Pico.video.reg[0xf];\r |
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84 | unsigned int source;\r |
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85 | \r |
86 | source =Pico.video.reg[0x15]<<1;\r |
87 | source|=Pico.video.reg[0x16]<<9;\r |
88 | source|=Pico.video.reg[0x17]<<17;\r |
89 | \r |
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90 | dprintf("DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i|%i] @ %x",\r |
91 | Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),\r |
92 | Pico.m.scanline, SekCyclesDone(), SekPc);\r |
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93 | \r |
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94 | if(Pico.m.scanline != -1) {\r |
95 | Pico.m.dma_bytes += len;\r |
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96 | if ((PicoMCD&1) && (PicoOpt & 0x2000)) SekCyclesBurn(CheckDMA());\r |
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97 | else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());\r |
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98 | } else {\r |
99 | // be approximate in non-accurate mode\r |
100 | SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));\r |
101 | }\r |
102 | \r |
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103 | if ((source&0xe00000)==0xe00000) { // Ram\r |
104 | pd=(u16 *)(Pico.ram+(source&0xfffe));\r |
105 | pdend=(u16 *)(Pico.ram+0x10000);\r |
106 | } else if(PicoMCD & 1) {\r |
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107 | dprintf("DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);\r |
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108 | if(source<0x20000) { // Bios area\r |
109 | pd=(u16 *)(Pico_mcd->bios+(source&~1));\r |
110 | pdend=(u16 *)(Pico_mcd->bios+0x20000);\r |
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111 | } else if ((source&0xfc0000)==0x200000) { // Word Ram\r |
112 | source -= 2;\r |
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113 | if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode\r |
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114 | pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));\r |
115 | pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);\r |
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116 | } else {\r |
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117 | if (source < 0x220000) { // 1M mode\r |
118 | int bank = Pico_mcd->s68k_regs[3]&1;\r |
119 | pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));\r |
120 | pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);\r |
121 | } else {\r |
122 | DmaSlowCell(source, a, len, inc);\r |
123 | return;\r |
124 | }\r |
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125 | }\r |
126 | } else if ((source&0xfe0000)==0x020000) { // Prg Ram\r |
127 | u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r |
128 | pd=(u16 *)(prg_ram+(source&0x1fffe));\r |
129 | pdend=(u16 *)(prg_ram+0x20000);\r |
130 | } else {\r |
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131 | dprintf("DmaSlow FIXME: unsupported src");\r |
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132 | return;\r |
133 | }\r |
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134 | } else {\r |
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135 | if(source<Pico.romsize) { // Rom\r |
136 | pd=(u16 *)(Pico.rom+(source&~1));\r |
137 | pdend=(u16 *)(Pico.rom+Pico.romsize);\r |
138 | } else {\r |
139 | dprintf("DmaSlow: invalid dma src");\r |
140 | return;\r |
141 | }\r |
142 | }\r |
143 | \r |
144 | // overflow protection, might break something..\r |
145 | if (len > pdend - pd) {\r |
146 | len = pdend - pd;\r |
147 | dprintf("DmaSlow overflow");\r |
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148 | }\r |
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149 | \r |
150 | switch (Pico.video.type)\r |
151 | {\r |
152 | case 1: // vram\r |
153 | r = Pico.vram;\r |
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154 | if (inc == 2 && !(a&1) && a+len*2 < 0x10000)\r |
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155 | {\r |
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156 | // most used DMA mode\r |
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157 | memcpy16(r + (a>>1), pd, len);\r |
158 | a += len*2;\r |
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159 | }\r |
160 | else\r |
161 | {\r |
162 | for(; len; len--)\r |
163 | {\r |
164 | d=*pd++;\r |
165 | if(a&1) d=(d<<8)|(d>>8);\r |
166 | r[a>>1] = (u16)d; // will drop the upper bits\r |
167 | // AutoIncrement\r |
168 | a=(u16)(a+inc);\r |
169 | // didn't src overlap?\r |
170 | //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM\r |
171 | }\r |
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172 | }\r |
173 | rendstatus|=0x10;\r |
174 | break;\r |
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175 | \r |
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176 | case 3: // cram\r |
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177 | Pico.m.dirtyPal = 1;\r |
178 | r = Pico.cram;\r |
179 | for(a2=a&0x7f; len; len--)\r |
180 | {\r |
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181 | r[a2>>1] = (u16)*pd++; // bit 0 is ignored\r |
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182 | // AutoIncrement\r |
183 | a2+=inc;\r |
184 | // didn't src overlap?\r |
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185 | //if(pd >= pdend) pd-=0x8000;\r |
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186 | // good dest?\r |
187 | if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis\r |
188 | }\r |
189 | a=(a&0xff00)|a2;\r |
190 | break;\r |
191 | \r |
192 | case 5: // vsram[a&0x003f]=d;\r |
193 | r = Pico.vsram;\r |
194 | for(a2=a&0x7f; len; len--)\r |
195 | {\r |
196 | r[a2>>1] = (u16)*pd++;\r |
197 | // AutoIncrement\r |
198 | a2+=inc;\r |
199 | // didn't src overlap?\r |
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200 | //if(pd >= pdend) pd-=0x8000;\r |
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201 | // good dest?\r |
202 | if(a2 >= 0x80) break;\r |
203 | }\r |
204 | a=(a&0xff00)|a2;\r |
205 | break;\r |
206 | }\r |
207 | // remember addr\r |
208 | Pico.video.addr=(u16)a;\r |
209 | }\r |
210 | \r |
211 | static void DmaCopy(int len)\r |
212 | {\r |
213 | u16 a=Pico.video.addr;\r |
214 | unsigned char *vr = (unsigned char *) Pico.vram;\r |
215 | unsigned char *vrs;\r |
216 | unsigned char inc=Pico.video.reg[0xf];\r |
217 | int source;\r |
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218 | dprintf("DmaCopy len %i [%i|%i]", len, Pico.m.scanline, SekCyclesDone());\r |
219 | \r |
220 | Pico.m.dma_bytes += len;\r |
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221 | if(Pico.m.scanline != -1)\r |
222 | Pico.video.status|=2; // dma busy\r |
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223 | \r |
224 | source =Pico.video.reg[0x15];\r |
225 | source|=Pico.video.reg[0x16]<<8;\r |
226 | vrs=vr+source;\r |
227 | \r |
228 | if(source+len > 0x10000) len=0x10000-source; // clip??\r |
229 | \r |
230 | for(;len;len--)\r |
231 | {\r |
232 | vr[a] = *vrs++;\r |
233 | // AutoIncrement\r |
234 | a=(u16)(a+inc);\r |
235 | }\r |
236 | // remember addr\r |
237 | Pico.video.addr=a;\r |
238 | rendstatus|=0x10;\r |
239 | }\r |
240 | \r |
241 | // check: Contra, Megaman\r |
242 | // note: this is still inaccurate\r |
243 | static void DmaFill(int data)\r |
244 | {\r |
245 | int len;\r |
246 | unsigned short a=Pico.video.addr;\r |
247 | unsigned char *vr=(unsigned char *) Pico.vram;\r |
248 | unsigned char high = (unsigned char) (data >> 8);\r |
249 | unsigned char inc=Pico.video.reg[0xf];\r |
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250 | \r |
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251 | len=GetDmaLength();\r |
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252 | dprintf("DmaFill len %i inc %i [%i|%i]", len, inc, Pico.m.scanline, SekCyclesDone());\r |
253 | \r |
254 | Pico.m.dma_bytes += len;\r |
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255 | if(Pico.m.scanline != -1)\r |
256 | Pico.video.status|=2; // dma busy (in accurate mode)\r |
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257 | \r |
258 | // from Charles MacDonald's genvdp.txt:\r |
259 | // Write lower byte to address specified\r |
260 | vr[a] = (unsigned char) data;\r |
261 | a=(u16)(a+inc);\r |
262 | \r |
263 | if(!inc) len=1;\r |
264 | \r |
265 | for(;len;len--) {\r |
266 | // Write upper byte to adjacent address\r |
267 | // (here we are byteswapped, so address is already 'adjacent')\r |
268 | vr[a] = high;\r |
269 | \r |
270 | // Increment address register\r |
271 | a=(u16)(a+inc);\r |
272 | }\r |
273 | // remember addr\r |
274 | Pico.video.addr=a;\r |
275 | // update length\r |
276 | Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)\r |
277 | \r |
278 | rendstatus|=0x10;\r |
279 | }\r |
280 | \r |
281 | static void CommandDma()\r |
282 | {\r |
283 | struct PicoVideo *pvid=&Pico.video;\r |
284 | int len=0,method=0;\r |
285 | \r |
286 | if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled\r |
287 | \r |
288 | len=GetDmaLength();\r |
289 | \r |
290 | method=pvid->reg[0x17]>>6;\r |
291 | if (method< 2) DmaSlow(len); // 68000 to VDP\r |
292 | if (method==3) DmaCopy(len); // VRAM Copy\r |
293 | }\r |
294 | \r |
295 | static void CommandChange()\r |
296 | {\r |
297 | struct PicoVideo *pvid=&Pico.video;\r |
298 | unsigned int cmd=0,addr=0;\r |
299 | \r |
300 | cmd=pvid->command;\r |
301 | \r |
302 | // Get type of transfer 0xc0000030 (v/c/vsram read/write)\r |
303 | pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));\r |
304 | \r |
305 | // Get address 0x3fff0003\r |
306 | addr =(cmd>>16)&0x3fff;\r |
307 | addr|=(cmd<<14)&0xc000;\r |
308 | pvid->addr=(unsigned short)addr;\r |
309 | //dprintf("addr set: %04x", addr);\r |
310 | \r |
311 | // Check for dma:\r |
312 | if (cmd&0x80) CommandDma();\r |
313 | }\r |
314 | \r |
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315 | PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)\r |
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316 | {\r |
317 | struct PicoVideo *pvid=&Pico.video;\r |
318 | \r |
319 | a&=0x1c;\r |
320 | \r |
321 | if (a==0x00) // Data port 0 or 2\r |
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322 | {\r |
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323 | if (pvid->pending) CommandChange();\r |
324 | pvid->pending=0;\r |
325 | \r |
326 | // If a DMA fill has been set up, do it\r |
327 | if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)\r |
328 | {\r |
329 | DmaFill(d);\r |
330 | }\r |
331 | else\r |
332 | {\r |
333 | VideoWrite(d);\r |
334 | }\r |
335 | return;\r |
336 | }\r |
337 | \r |
338 | if (a==0x04) // Control (command) port 4 or 6\r |
339 | {\r |
340 | //dprintf("vdp cw(%04x), p=%i @ %06x [%i]", d, pvid->pending, SekPc, SekCyclesDone());\r |
341 | if(pvid->pending)\r |
342 | {\r |
343 | // Low word of command:\r |
344 | pvid->command&=0xffff0000;\r |
345 | pvid->command|=d;\r |
346 | pvid->pending=0;\r |
347 | CommandChange();\r |
348 | } else {\r |
349 | if((d&0xc000)==0x8000)\r |
350 | {\r |
351 | // Register write:\r |
352 | int num=(d>>8)&0x1f;\r |
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353 | 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 |
354 | 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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355 | //if(num==01) dprintf("set_blank: %i @ %06x [%i|%i]", !((d&0x40)>>6), SekPc, Pico.m.scanline, SekCyclesDone());\r |
356 | //if(num==05) dprintf("spr_set: %i @ %06x [%i|%i]", (unsigned char)d, SekPc, Pico.m.scanline, SekCyclesDone());\r |
357 | //if(num==10) dprintf("hint_set: %i @ %06x [%i|%i]", (unsigned char)d, SekPc, Pico.m.scanline, SekCyclesDone());\r |
358 | pvid->reg[num]=(unsigned char)d;\r |
359 | #if !(defined(EMU_C68K) && defined(EMU_M68K)) // not debugging Cyclone\r |
360 | // update IRQ level (Lemmings, Wiz 'n' Liz intro, ... )\r |
361 | // may break if done improperly:\r |
362 | // International Superstar Soccer Deluxe (crash), Street Racer (logos), Burning Force (gfx), Fatal Rewind (hang), Sesame Street Counting Cafe\r |
363 | if(num < 2) {\r |
364 | #ifdef EMU_C68K\r |
365 | // hack: make sure we do not touch the irq line if Cyclone is just about to take the IRQ\r |
366 | if (PicoCpu.irq <= (PicoCpu.srh&7)) {\r |
367 | #endif\r |
368 | int lines, pints;\r |
369 | lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);\r |
370 | pints = (pvid->pending_ints&lines);\r |
371 | if(pints & 0x20) SekInterrupt(6);\r |
372 | else if(pints & 0x10) SekInterrupt(4);\r |
373 | else SekInterrupt(0);\r |
374 | #ifdef EMU_C68K\r |
375 | // adjust cycles for Cyclone so it would take the int "in time"\r |
376 | if(PicoCpu.irq) {\r |
377 | SekEndRun(24);\r |
378 | }\r |
379 | }\r |
380 | #endif\r |
381 | }\r |
382 | else\r |
383 | #endif\r |
384 | if(num == 5) rendstatus|=1;\r |
385 | else if(num == 0xc) Pico.m.dirtyPal = 2; // renderers should update their palettes if sh/hi mode is changed\r |
386 | pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)\r |
387 | } else {\r |
388 | // High word of command:\r |
389 | pvid->command&=0x0000ffff;\r |
390 | pvid->command|=d<<16;\r |
391 | pvid->pending=1;\r |
392 | }\r |
393 | }\r |
394 | }\r |
395 | }\r |
396 | \r |
eff55556 |
397 | PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)\r |
cc68a136 |
398 | {\r |
399 | unsigned int d=0;\r |
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400 | \r |
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401 | a&=0x1c;\r |
402 | \r |
403 | if (a==0x00) // data port\r |
404 | {\r |
405 | d=VideoRead();\r |
406 | goto end;\r |
407 | }\r |
408 | \r |
409 | if (a==0x04) // control port\r |
410 | {\r |
cc68a136 |
411 | d=Pico.video.status;\r |
412 | if(PicoOpt&0x10) d|=0x0020; // sprite collision (Shadow of the Beast)\r |
413 | if(Pico.m.rotate++&8) d|=0x0100; else d|=0x0200; // Toggle fifo full empty (who uses that stuff?)\r |
414 | if(!(Pico.video.reg[1]&0x40)) d|=0x0008; // set V-Blank if display is disabled\r |
415 | if(SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs)\r |
bf098bc5 |
416 | // dprintf("sr_read %04x @ %06x [%i|%i]", d, SekPc, Pico.m.scanline, SekCyclesDone());\r |
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417 | \r |
418 | Pico.video.pending=0; // ctrl port reads clear write-pending flag (Charles MacDonald)\r |
419 | \r |
420 | goto end;\r |
421 | }\r |
422 | \r |
423 | // H-counter info (based on Generator):\r |
424 | // frame:\r |
425 | // | <- hblank? -> |\r |
426 | // start <416> hint <36> hdisplay <38> end // CPU cycles\r |
427 | // |---------...---------|------------|-------------|\r |
428 | // 0 B6 E4 FF // 40 cells\r |
429 | // 0 93 E8 FF // 32 cells\r |
430 | \r |
431 | // Gens (?) v-render\r |
432 | // start <hblank=84> hint hdisplay <404> |\r |
433 | // |---------------------|--------------------------|\r |
434 | // E4 (hc[0x43]==0) 07 B1 // 40\r |
435 | // E8 (hc[0x45]==0) 05 91 // 32\r |
4f672280 |
436 | \r |
cc68a136 |
437 | // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune\r |
438 | if ((a&0x1c)==0x08)\r |
439 | {\r |
440 | unsigned int hc;\r |
441 | \r |
442 | if(Pico.m.scanline != -1) {\r |
443 | int lineCycles=(488-SekCyclesLeft)&0x1ff;\r |
444 | d=Pico.m.scanline; // V-Counter\r |
445 | \r |
446 | if(Pico.video.reg[12]&1)\r |
447 | hc=hcounts_40[lineCycles];\r |
448 | else hc=hcounts_32[lineCycles];\r |
449 | \r |
8c1952f0 |
450 | //if(lineCycles > 488-12) d++; // Wheel of Fortune\r |
cc68a136 |
451 | } else {\r |
452 | // get approximate V-Counter\r |
453 | d=vcounts[SekCyclesDone()>>8];\r |
454 | hc = Pico.m.rotate&0xff;\r |
455 | }\r |
456 | \r |
457 | if(Pico.m.pal) {\r |
458 | if(d >= 0x103) d-=56; // based on Gens\r |
459 | } else {\r |
460 | if(d >= 0xEB) d-=6;\r |
461 | }\r |
462 | \r |
463 | if((Pico.video.reg[12]&6) == 6) {\r |
464 | // interlace mode 2 (Combat Cars (UE) [!])\r |
465 | d <<= 1;\r |
466 | if (d&0xf00) d|= 1;\r |
467 | }\r |
468 | \r |
4f672280 |
469 | dprintf("hv: %02x %02x (%i) @ %06x", hc, d, SekCyclesDone(), SekPc);\r |
cc68a136 |
470 | d&=0xff; d<<=8;\r |
471 | d|=hc;\r |
472 | goto end;\r |
473 | }\r |
474 | \r |
475 | end:\r |
476 | \r |
477 | return d;\r |
478 | }\r |