db2a406a4557053c497dfdf4337bd57bae249bb3
[picodrive.git] / Pico / cd / gfx_cd.c
1 // TODO...
2
3 // #include <string.h>
4 #include "../PicoInt.h"
5
6 #define rot_comp Pico_mcd->rot_comp
7
8 static const int Table_Rot_Time[] =
9 {
10         0x00054000, 0x00048000, 0x00040000, 0x00036000,          //; 008-032               ; briefing - sprite
11         0x0002E000, 0x00028000, 0x00024000, 0x00022000,          //; 036-064               ; arbre souvent
12         0x00021000, 0x00020000, 0x0001E000, 0x0001B800,          //; 068-096               ; map thunderstrike
13         0x00019800, 0x00017A00, 0x00015C00, 0x00013E00,          //; 100-128               ; logo défoncé
14
15         0x00012000, 0x00011800, 0x00011000, 0x00010800,          //; 132-160               ; briefing - map
16         0x00010000, 0x0000F800, 0x0000F000, 0x0000E800,          //; 164-192
17         0x0000E000, 0x0000D800, 0x0000D000, 0x0000C800,          //; 196-224
18         0x0000C000, 0x0000B800, 0x0000B000, 0x0000A800,          //; 228-256               ; batman visage
19
20         0x0000A000, 0x00009F00, 0x00009E00, 0x00009D00,          //; 260-288
21         0x00009C00, 0x00009B00, 0x00009A00, 0x00009900,          //; 292-320
22         0x00009800, 0x00009700, 0x00009600, 0x00009500,          //; 324-352
23         0x00009400, 0x00009300, 0x00009200, 0x00009100,          //; 356-384
24
25         0x00009000, 0x00008F00, 0x00008E00, 0x00008D00,          //; 388-416
26         0x00008C00, 0x00008B00, 0x00008A00, 0x00008900,          //; 420-448
27         0x00008800, 0x00008700, 0x00008600, 0x00008500,          //; 452-476
28         0x00008400, 0x00008300, 0x00008200, 0x00008100,          //; 480-512
29 };
30
31
32 static void gfx_cd_start(void)
33 {
34         int upd_len;
35
36         dprintf("gfx_cd_start()");
37
38         // rot_comp.XD_Mul = ((rot_comp.Reg_5C & 0x1f) + 1) * 4; // unused
39         rot_comp.Function = (rot_comp.Reg_58 & 7) | (Pico_mcd->s68k_regs[3] & 0x18);    // Jmp_Adr
40         // rot_comp.Buffer_Adr = (rot_comp.Reg_5E & 0xfff8) << 2; // unused?
41         rot_comp.YD = (rot_comp.Reg_60 >> 3) & 7;
42         rot_comp.Vector_Adr = (rot_comp.Reg_66 & 0xfffe) << 2;
43
44         upd_len = (rot_comp.Reg_62 >> 3) & 0x3f;
45         upd_len = Table_Rot_Time[upd_len];
46         rot_comp.Draw_Speed = rot_comp.Float_Part = upd_len;
47
48         rot_comp.Reg_58 |= 0x8000;      // Stamp_Size,  we start a new GFX operation
49
50         switch (rot_comp.Reg_58 & 6)    // Scr_16?
51         {
52                 case 0: // ?
53                         rot_comp.Stamp_Map_Adr = (rot_comp.Reg_5A & 0xff80) << 2;
54                         break;
55                 case 2: // .Dot_32
56                         rot_comp.Stamp_Map_Adr = (rot_comp.Reg_5A & 0xffe0) << 2;
57                         break;
58                 case 4: // .Scr_16
59                         rot_comp.Stamp_Map_Adr = 0x20000;
60                         break;
61                 case 6: // .Scr_16_Dot_32
62                         rot_comp.Stamp_Map_Adr = (rot_comp.Reg_5A & 0xe000) << 2;
63                         break;
64         }
65
66         gfx_cd_update();
67 }
68
69
70 static void gfx_completed(void)
71 {
72         rot_comp.Reg_58 &= 0x7fff;      // Stamp_Size
73         rot_comp.Reg_64  = 0;
74         if (Pico_mcd->s68k_regs[0x33] & (1<<1))
75         {
76                 dprintf("gfx_cd irq 1");
77                 SekInterruptS68k(1);
78         }
79 }
80
81
82 static void gfx_do(unsigned int func, unsigned short *stamp_base, unsigned int H_Dot)
83 {
84         unsigned int eax, ebx, ecx, edx, esi, edi, pixel;
85         unsigned int XD, Buffer_Adr;
86         int DYXS;
87
88         XD = rot_comp.Reg_60 & 7;
89         Buffer_Adr = ((rot_comp.Reg_5E & 0xfff8) + rot_comp.YD) << 2;
90         ecx = *(unsigned int *)(Pico_mcd->word_ram2M + rot_comp.Vector_Adr);
91         edx = ecx >> 16;
92         ecx = (ecx & 0xffff) << 8;
93         edx <<= 8;
94         DYXS = *(int *)(Pico_mcd->word_ram2M + rot_comp.Vector_Adr + 4);
95         rot_comp.Vector_Adr += 8;
96
97         // MAKE_IMAGE_LINE
98         while (H_Dot)
99         {
100                 if (func & 2)           // mode 32x32 dot
101                 {
102                         if (func & 4)   // 16x16 screen
103                         {
104                                 ebx = ((ecx >> (11+5)) & 0x007f) |
105                                       ((edx >> (11-2)) & 0x3f80);
106                         }
107                         else            // 1x1 screen
108                         {
109                                 ebx = ((ecx >> (11+5)) & 0x07) |
110                                       ((edx >> (11+2)) & 0x38);
111                         }
112                 }
113                 else                    // mode 16x16 dot
114                 {
115                         if (func & 4)   // 16x16 screen
116                         {
117                                 ebx = ((ecx >> (11+4)) & 0x00ff) |
118                                       ((edx >> (11-4)) & 0xff00);
119                         }
120                         else            // 1x1 screen
121                         {
122                                 ebx = ((ecx >> (11+4)) & 0x0f) |
123                                       ((edx >> (11+0)) & 0xf0);
124                         }
125                 }
126
127                 // MAKE_IMAGE_PIXEL
128                 if (!(func & 1))        // NOT TILED
129                 {
130                         int mask = (func & 4) ? 0x00800000 : 0x00f80000;
131                         if ((ecx | edx) & mask)
132                         {
133                                 if (func & 0x18) goto Next_Pixel;
134                                 pixel = 0;
135                                 goto Pixel_Out;
136                         }
137                 }
138
139                 edi = stamp_base[ebx];// | (stamp_base[ebx+1] << 16);
140                 esi = (edi & 0x7ff) << 7;
141                 if (!esi) { pixel = 0; goto Pixel_Out; }
142                 edi >>= (11+1);
143                 edi &= (0x1c>>1);
144                 eax = ecx;
145                 ebx = edx;
146                 if (func & 2) edi |= 1; // 32 dots?
147                 switch (edi)
148                 {
149                         case 0x00:      // No_Flip_0, 16x16 dots
150                                 ebx = (ebx >> 9) & 0x3c;
151                                 ebx += esi;
152                                 edi = (eax & 0x3800) ^ 0x1000;          // bswap
153                                 eax = ((eax >> 8) & 0x40) + ebx;
154                                 break;
155                         case 0x01:      // No_Flip_0, 32x32 dots
156                                 ebx = (ebx >> 9) & 0x7c;
157                                 ebx += esi;
158                                 edi = (eax & 0x3800) ^ 0x1000;          // bswap
159                                 eax = ((eax >> 7) & 0x180) + ebx;
160                                 break;
161                         case 0x02:      // No_Flip_90, 16x16 dots
162                                 eax = (eax >> 9) & 0x3c;
163                                 eax += esi;
164                                 edi = (ebx & 0x3800) ^ 0x2800;          // bswap
165                                 eax += ((ebx >> 8) & 0x40) ^ 0x40;
166                                 break;
167                         case 0x03:      // No_Flip_90, 32x32 dots
168                                 eax = (eax >> 9) & 0x7c;
169                                 eax += esi;
170                                 edi = (ebx & 0x3800) ^ 0x2800;          // bswap
171                                 eax += ((ebx >> 7) & 0x180) ^ 0x180;
172                                 break;
173                         case 0x04:      // No_Flip_180, 16x16 dots
174                                 ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
175                                 ebx += esi;
176                                 edi = (eax & 0x3800) ^ 0x2800;          // bswap and flip
177                                 eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
178                                 break;
179                         case 0x05:      // No_Flip_180, 32x32 dots
180                                 ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
181                                 ebx += esi;
182                                 edi = (eax & 0x3800) ^ 0x2800;          // bswap and flip
183                                 eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
184                                 break;
185                         case 0x06:      // No_Flip_270, 16x16 dots
186                                 eax = ((eax >> 9) & 0x3c) ^ 0x3c;
187                                 eax += esi;
188                                 edi = (ebx & 0x3800) ^ 0x1000;          // bswap
189                                 eax += (ebx >> 8) & 0x40;
190                                 break;
191                         case 0x07:      // No_Flip_270, 32x32 dots
192                                 eax = ((eax >> 9) & 0x7c) ^ 0x7c;
193                                 eax += esi;
194                                 edi = (ebx & 0x3800) ^ 0x1000;          // bswap
195                                 eax += (ebx >> 7) & 0x180;
196                                 break;
197                         case 0x08:      // Flip_0, 16x16 dots
198                                 ebx = (ebx >> 9) & 0x3c;
199                                 ebx += esi;
200                                 edi = (eax & 0x3800) ^ 0x2800;          // bswap, flip
201                                 eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
202                                 break;
203                         case 0x09:      // Flip_0, 32x32 dots
204                                 ebx = (ebx >> 9) & 0x7c;
205                                 ebx += esi;
206                                 edi = (eax & 0x3800) ^ 0x2800;          // bswap, flip
207                                 eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
208                                 break;
209                         case 0x0a:      // Flip_90, 16x16 dots
210                                 eax = ((eax >> 9) & 0x3c) ^ 0x3c;
211                                 eax += esi;
212                                 edi = (ebx & 0x3800) ^ 0x2800;          // bswap, flip
213                                 eax += ((ebx >> 8) & 0x40) ^ 0x40;
214                                 break;
215                         case 0x0b:      // Flip_90, 32x32 dots
216                                 eax = ((eax >> 9) & 0x7c) ^ 0x7c;
217                                 eax += esi;
218                                 edi = (ebx & 0x3800) ^ 0x2800;          // bswap, flip
219                                 eax += ((ebx >> 7) & 0x180) ^ 0x180;
220                                 break;
221                         case 0x0c:      // Flip_180, 16x16 dots
222                                 ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
223                                 ebx += esi;
224                                 edi = (eax & 0x3800) ^ 0x1000;          // bswap
225                                 eax = ((eax >> 8) & 0x40) + ebx;
226                                 break;
227                         case 0x0d:      // Flip_180, 32x32 dots
228                                 ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
229                                 ebx += esi;
230                                 edi = (eax & 0x3800) ^ 0x1000;          // bswap
231                                 eax = ((eax >> 7) & 0x180) + ebx;
232                                 break;
233                         case 0x0e:      // Flip_270, 16x16 dots
234                                 eax = (eax >> 9) & 0x3c;
235                                 eax += esi;
236                                 edi = (ebx & 0x3800) ^ 0x1000;          // bswap, flip
237                                 eax += (ebx >> 8) & 0x40;
238                                 break;
239                         case 0x0f:      // Flip_270, 32x32 dots
240                                 eax = (eax >> 9) & 0x7c;
241                                 eax += esi;
242                                 edi = (ebx & 0x3800) ^ 0x1000;          // bswap, flip
243                                 eax += (ebx >> 7) & 0x180;
244                                 break;
245                 }
246
247                 pixel = *(Pico_mcd->word_ram2M + (edi >> 12) + eax);
248                 if (!(edi & 0x800)) pixel >>= 4;
249                 else pixel &= 0x0f;
250
251 Pixel_Out:
252                 if (!pixel && (func & 0x18)) goto Next_Pixel;
253                 esi = Buffer_Adr + ((XD>>1)^1);                         // pixel addr
254                 eax = *(Pico_mcd->word_ram2M + esi);                    // old pixel
255                 if (XD & 1)
256                 {
257                         if ((eax & 0x0f) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
258                         *(Pico_mcd->word_ram2M + esi) = pixel | (eax & 0xf0);
259                 }
260                 else
261                 {
262                         if ((eax & 0xf0) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
263                         *(Pico_mcd->word_ram2M + esi) = (pixel << 4) | (eax & 0xf);
264                 }
265
266
267 Next_Pixel:
268                 ecx += (DYXS << 16) >> 16;      // rot_comp.DXS;
269                 edx +=  DYXS >> 16;             // rot_comp.DYS;
270                 XD++;
271                 if (XD >= 8)
272                 {
273                         Buffer_Adr += ((rot_comp.Reg_5C & 0x1f) + 1) << 5;
274                         XD = 0;
275                 }
276                 H_Dot--;
277         }
278         // end while
279
280
281 // nothing_to_draw:
282         rot_comp.YD++;
283         // rot_comp.V_Dot--; // will be done by caller
284 }
285
286
287 void gfx_cd_update(void)
288 {
289         int V_Dot = rot_comp.Reg_64 & 0xff;
290         int jobs;
291
292         dprintf("gfx_cd_update, Reg_64 = %04x", rot_comp.Reg_64);
293
294         if (!V_Dot)
295         {
296                 gfx_completed();
297                 return;
298         }
299
300         jobs = rot_comp.Float_Part >> 16;
301
302         if (!jobs)
303         {
304                 rot_comp.Float_Part += rot_comp.Draw_Speed;
305                 return;
306         }
307
308         rot_comp.Float_Part &= 0xffff;
309         rot_comp.Float_Part += rot_comp.Draw_Speed;
310
311         if (PicoOpt & 0x1000)                   // scale/rot enabled
312         {
313                 unsigned int func = rot_comp.Function;
314                 unsigned int H_Dot = rot_comp.Reg_62 & 0x1ff;
315                 unsigned short *stamp_base = (unsigned short *) (Pico_mcd->word_ram2M + rot_comp.Stamp_Map_Adr);
316
317                 while (jobs--)
318                 {
319                         gfx_do(func, stamp_base, H_Dot);        // jmp [Jmp_Adr]:
320
321                         V_Dot--;                                // dec byte [V_Dot]
322                         if (V_Dot == 0)
323                         {
324                                 // GFX_Completed:
325                                 gfx_completed();
326                                 return;
327                         }
328                 }
329         }
330         else
331         {
332                 if (jobs >= V_Dot)
333                 {
334                         gfx_completed();
335                         return;
336                 }
337                 V_Dot -= jobs;
338         }
339
340         rot_comp.Reg_64 = V_Dot;
341 }
342
343
344 unsigned int gfx_cd_read(unsigned int a)
345 {
346         unsigned int d = 0;
347
348         switch (a) {
349                 case 0x58: d = rot_comp.Reg_58; break;
350                 case 0x5A: d = rot_comp.Reg_5A; break;
351                 case 0x5C: d = rot_comp.Reg_5C; break;
352                 case 0x5E: d = rot_comp.Reg_5E; break;
353                 case 0x60: d = rot_comp.Reg_60; break;
354                 case 0x62: d = rot_comp.Reg_62; break;
355                 case 0x64: d = rot_comp.Reg_64; break;
356                 case 0x66: break;
357                 default: dprintf("gfx_cd_read FIXME: unexpected address: %02x", a); break;
358         }
359
360         dprintf("gfx_cd_read(%02x) = %04x", a, d);
361
362         return 0;
363 }
364
365 void gfx_cd_write16(unsigned int a, unsigned int d)
366 {
367         dprintf("gfx_cd_write16(%x, %04x)", a, d);
368
369         switch (a) {
370                 case 0x58: // .Reg_Stamp_Size
371                         rot_comp.Reg_58 = d & 7;
372                         return;
373
374                 case 0x5A: // .Reg_Stamp_Adr
375                         rot_comp.Reg_5A = d & 0xffe0;
376                         return;
377
378                 case 0x5C: // .Reg_IM_VCell_Size
379                         rot_comp.Reg_5C = d & 0x1f;
380                         return;
381
382                 case 0x5E: // .Reg_IM_Adr
383                         rot_comp.Reg_5E = d & 0xFFF8;
384                         return;
385
386                 case 0x60: // .Reg_IM_Offset
387                         rot_comp.Reg_60 = d & 0x3f;
388                         return;
389
390                 case 0x62: // .Reg_IM_HDot_Size
391                         rot_comp.Reg_62 = d & 0x1ff;
392                         return;
393
394                 case 0x64: // .Reg_IM_VDot_Size
395                         rot_comp.Reg_64 = d & 0xff;     // V_Dot, must be 32bit?
396                         return;
397
398                 case 0x66: // .Reg_Vector_Adr
399                         rot_comp.Reg_66 = d & 0xfffe;
400                         if (Pico_mcd->s68k_regs[3]&4) return; // can't do tanformations in 1M mode
401                         gfx_cd_start();
402                         return;
403
404                 default: dprintf("gfx_cd_write16 FIXME: unexpected address: %02x", a); return;
405         }
406 }
407
408
409 void gfx_cd_reset(void)
410 {
411         memset(&rot_comp.Reg_58, 0, sizeof(rot_comp));
412 }
413
414
415 // --------------------------------
416
417 #include "cell_map.c"
418
419 typedef unsigned short u16;
420
421 // check: Heart of the alien, jaguar xj 220
422 void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc)
423 {
424   unsigned char *base;
425   unsigned int asrc, a2;
426   u16 *r;
427
428   base = Pico_mcd->word_ram1M[Pico_mcd->s68k_regs[3]&1];
429
430   switch (Pico.video.type)
431   {
432     case 1: // vram
433       r = Pico.vram;
434       for(; len; len--)
435       {
436         asrc = cell_map(source >> 2) << 2;
437         asrc |= source & 2;
438         // if(a&1) d=(d<<8)|(d>>8); // ??
439         r[a>>1] = *(u16 *)(base + asrc);
440         source += 2;
441         // AutoIncrement
442         a=(u16)(a+inc);
443       }
444       rendstatus|=0x10;
445       break;
446
447     case 3: // cram
448       Pico.m.dirtyPal = 1;
449       r = Pico.cram;
450       for(a2=a&0x7f; len; len--)
451       {
452         asrc = cell_map(source >> 2) << 2;
453         asrc |= source & 2;
454         r[a2>>1] = *(u16 *)(base + asrc);
455         source += 2;
456         // AutoIncrement
457         a2+=inc;
458         // good dest?
459         if(a2 >= 0x80) break;
460       }
461       a=(a&0xff00)|a2;
462       break;
463
464     case 5: // vsram[a&0x003f]=d;
465       r = Pico.vsram;
466       for(a2=a&0x7f; len; len--)
467       {
468         asrc = cell_map(source >> 2) << 2;
469         asrc |= source & 2;
470         r[a2>>1] = *(u16 *)(base + asrc);
471         source += 2;
472         // AutoIncrement
473         a2+=inc;
474         // good dest?
475         if(a2 >= 0x80) break;
476       }
477       a=(a&0xff00)|a2;
478       break;
479   }
480   // remember addr
481   Pico.video.addr=(u16)a;
482 }
483