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don't draw layer where window is (for World Championship Soccer II)
[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
6cadc2da 4// (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas\r
cc68a136 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
cc68a136 12\r
13extern const unsigned char hcounts_32[];\r
14extern const unsigned char hcounts_40[];\r
15extern const unsigned short vcounts[];\r
16extern int rendstatus;\r
17\r
eff55556 18#ifndef UTYPES_DEFINED\r
ab0607f7 19typedef unsigned char u8;\r
cc68a136 20typedef unsigned short u16;\r
eff55556 21typedef unsigned int u32;\r
22#define UTYPES_DEFINED\r
23#endif\r
cc68a136 24\r
25\r
26static __inline void AutoIncrement()\r
27{\r
28 Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);\r
29}\r
30\r
31static 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
50static 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
4f672280 62\r
cc68a136 63 AutoIncrement();\r
64 return d;\r
65}\r
66\r
cc68a136 67static 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
79static 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
672ad671 84 unsigned int source;\r
cc68a136 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
312e9ce1 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
cc68a136 93\r
672ad671 94 if(Pico.m.scanline != -1) {\r
95 Pico.m.dma_bytes += len;\r
2d0b15bb 96 if ((PicoMCD&1) && (PicoOpt & 0x2000)) SekCyclesBurn(CheckDMA());\r
7336a99a 97 else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());\r
672ad671 98 } else {\r
99 // be approximate in non-accurate mode\r
100 SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));\r
101 }\r
102\r
ab0607f7 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
fa1e5e29 107 dprintf("DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);\r
ab0607f7 108 if(source<0x20000) { // Bios area\r
109 pd=(u16 *)(Pico_mcd->bios+(source&~1));\r
110 pdend=(u16 *)(Pico_mcd->bios+0x20000);\r
fa1e5e29 111 } else if ((source&0xfc0000)==0x200000) { // Word Ram\r
112 source -= 2;\r
ab0607f7 113 if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode\r
fa1e5e29 114 pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));\r
115 pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);\r
ab0607f7 116 } else {\r
fa1e5e29 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
ab0607f7 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
fa1e5e29 131 dprintf("DmaSlow FIXME: unsupported src");\r
ab0607f7 132 return;\r
133 }\r
672ad671 134 } else {\r
ab0607f7 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
672ad671 148 }\r
cc68a136 149\r
150 switch (Pico.video.type)\r
151 {\r
152 case 1: // vram\r
153 r = Pico.vram;\r
cea65903 154 if (inc == 2 && !(a&1) && a+len*2 < 0x10000)\r
cc68a136 155 {\r
cea65903 156 // most used DMA mode\r
fa1e5e29 157 memcpy16(r + (a>>1), pd, len);\r
158 a += len*2;\r
cea65903 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
cc68a136 172 }\r
173 rendstatus|=0x10;\r
174 break;\r
4f672280 175\r
cc68a136 176 case 3: // cram\r
cc68a136 177 Pico.m.dirtyPal = 1;\r
178 r = Pico.cram;\r
179 for(a2=a&0x7f; len; len--)\r
180 {\r
0a051f55 181 r[a2>>1] = (u16)*pd++; // bit 0 is ignored\r
cc68a136 182 // AutoIncrement\r
183 a2+=inc;\r
184 // didn't src overlap?\r
ab0607f7 185 //if(pd >= pdend) pd-=0x8000;\r
cc68a136 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
ab0607f7 200 //if(pd >= pdend) pd-=0x8000;\r
cc68a136 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
211static 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
4f672280 218 dprintf("DmaCopy len %i [%i|%i]", len, Pico.m.scanline, SekCyclesDone());\r
219\r
220 Pico.m.dma_bytes += len;\r
8c1952f0 221 if(Pico.m.scanline != -1)\r
222 Pico.video.status|=2; // dma busy\r
cc68a136 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
243static 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
4f672280 250\r
cc68a136 251 len=GetDmaLength();\r
4f672280 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
8c1952f0 255 if(Pico.m.scanline != -1)\r
256 Pico.video.status|=2; // dma busy (in accurate mode)\r
cc68a136 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
281static 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
295static 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
eff55556 315PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)\r
cc68a136 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
4f672280 322 {\r
cc68a136 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
312e9ce1 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
cc68a136 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 397PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)\r
cc68a136 398{\r
399 unsigned int d=0;\r
4f672280 400\r
cc68a136 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
cc68a136 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
475end:\r
476\r
477 return d;\r
478}\r
fast MegaDrive/MegaCD/32X emulator