1 // This is a direct rewrite of gfx_cd.asm (x86 asm to C).
2 // You can even find some x86 register names :)
3 // Original code (c) 2002 by Stéphane Dallongeville
5 // (c) Copyright 2007, Grazvydas "notaz" Ignotas
8 #include "../pico_int.h"
13 #define _rot_comp Pico_mcd->rot_comp
15 static const int Table_Rot_Time[] =
17 0x00054000, 0x00048000, 0x00040000, 0x00036000, //; 008-032 ; briefing - sprite
18 0x0002E000, 0x00028000, 0x00024000, 0x00022000, //; 036-064 ; arbre souvent
19 0x00021000, 0x00020000, 0x0001E000, 0x0001B800, //; 068-096 ; map thunderstrike
20 0x00019800, 0x00017A00, 0x00015C00, 0x00013E00, //; 100-128 ; logo défoncé
22 0x00012000, 0x00011800, 0x00011000, 0x00010800, //; 132-160 ; briefing - map
23 0x00010000, 0x0000F800, 0x0000F000, 0x0000E800, //; 164-192
24 0x0000E000, 0x0000D800, 0x0000D000, 0x0000C800, //; 196-224
25 0x0000C000, 0x0000B800, 0x0000B000, 0x0000A800, //; 228-256 ; batman visage
27 0x0000A000, 0x00009F00, 0x00009E00, 0x00009D00, //; 260-288
28 0x00009C00, 0x00009B00, 0x00009A00, 0x00009900, //; 292-320
29 0x00009800, 0x00009700, 0x00009600, 0x00009500, //; 324-352
30 0x00009400, 0x00009300, 0x00009200, 0x00009100, //; 356-384
32 0x00009000, 0x00008F00, 0x00008E00, 0x00008D00, //; 388-416
33 0x00008C00, 0x00008B00, 0x00008A00, 0x00008900, //; 420-448
34 0x00008800, 0x00008700, 0x00008600, 0x00008500, //; 452-476
35 0x00008400, 0x00008300, 0x00008200, 0x00008100, //; 480-512
39 static void gfx_cd_start(void)
43 // _rot_comp.XD_Mul = ((_rot_comp.Reg_5C & 0x1f) + 1) * 4; // unused
44 _rot_comp.Function = (_rot_comp.Reg_58 & 7) | (Pico_mcd->s68k_regs[3] & 0x18); // Jmp_Adr
45 // _rot_comp.Buffer_Adr = (_rot_comp.Reg_5E & 0xfff8) << 2; // unused?
46 _rot_comp.YD = (_rot_comp.Reg_60 >> 3) & 7;
47 _rot_comp.Vector_Adr = (_rot_comp.Reg_66 & 0xfffe) << 2;
49 upd_len = (_rot_comp.Reg_62 >> 3) & 0x3f;
50 upd_len = Table_Rot_Time[upd_len];
51 _rot_comp.Draw_Speed = _rot_comp.Float_Part = upd_len;
53 _rot_comp.Reg_58 |= 0x8000; // Stamp_Size, we start a new GFX operation
55 switch (_rot_comp.Reg_58 & 6) // Scr_16?
58 _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xff80) << 2;
61 _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xffe0) << 2;
64 _rot_comp.Stamp_Map_Adr = 0x20000;
66 case 6: // .Scr_16_Dot_32
67 _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xe000) << 2;
71 dprintf("gfx_cd_start, stamp_map_addr=%06x", _rot_comp.Stamp_Map_Adr);
77 static void gfx_completed(void)
79 _rot_comp.Reg_58 &= 0x7fff; // Stamp_Size
81 if (Pico_mcd->s68k_regs[0x33] & (1<<1))
83 elprintf(EL_INTS, "gfx_cd irq 1");
89 static void gfx_do(unsigned int func, unsigned short *stamp_base, unsigned int H_Dot)
91 unsigned int eax, ebx, ecx, edx, esi, edi, pixel;
92 unsigned int XD, Buffer_Adr;
95 XD = _rot_comp.Reg_60 & 7;
96 Buffer_Adr = ((_rot_comp.Reg_5E & 0xfff8) + _rot_comp.YD) << 2;
97 ecx = *(unsigned int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr);
99 ecx = (ecx & 0xffff) << 8;
101 DYXS = *(int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr + 4);
102 _rot_comp.Vector_Adr += 8;
108 if (!(func & 1)) // NOT TILED
110 int mask = (func & 4) ? 0x00800000 : 0x00f80000;
111 if ((ecx | edx) & mask)
113 if (func & 0x18) goto Next_Pixel;
119 if (func & 2) // mode 32x32 dot
121 if (func & 4) // 16x16 screen
123 ebx = ((ecx >> (11+5)) & 0x007f) |
124 ((edx >> (11-2)) & 0x3f80);
128 ebx = ((ecx >> (11+5)) & 0x07) |
129 ((edx >> (11+2)) & 0x38);
132 else // mode 16x16 dot
134 if (func & 4) // 16x16 screen
136 ebx = ((ecx >> (11+4)) & 0x00ff) |
137 ((edx >> (11-4)) & 0xff00);
141 ebx = ((ecx >> (11+4)) & 0x0f) |
142 ((edx >> (11+0)) & 0xf0);
146 edi = stamp_base[ebx];
147 esi = (edi & 0x7ff) << 7;
148 if (!esi) { pixel = 0; goto Pixel_Out; }
153 if (func & 2) edi |= 1; // 32 dots?
156 case 0x00: // No_Flip_0, 16x16 dots
157 ebx = (ebx >> 9) & 0x3c;
159 edi = (eax & 0x3800) ^ 0x1000; // bswap
160 eax = ((eax >> 8) & 0x40) + ebx;
162 case 0x01: // No_Flip_0, 32x32 dots
163 ebx = (ebx >> 9) & 0x7c;
165 edi = (eax & 0x3800) ^ 0x1000; // bswap
166 eax = ((eax >> 7) & 0x180) + ebx;
168 case 0x02: // No_Flip_90, 16x16 dots
169 eax = (eax >> 9) & 0x3c;
171 edi = (ebx & 0x3800) ^ 0x2800; // bswap
172 eax += ((ebx >> 8) & 0x40) ^ 0x40;
174 case 0x03: // No_Flip_90, 32x32 dots
175 eax = (eax >> 9) & 0x7c;
177 edi = (ebx & 0x3800) ^ 0x2800; // bswap
178 eax += ((ebx >> 7) & 0x180) ^ 0x180;
180 case 0x04: // No_Flip_180, 16x16 dots
181 ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
183 edi = (eax & 0x3800) ^ 0x2800; // bswap and flip
184 eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
186 case 0x05: // No_Flip_180, 32x32 dots
187 ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
189 edi = (eax & 0x3800) ^ 0x2800; // bswap and flip
190 eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
192 case 0x06: // No_Flip_270, 16x16 dots
193 eax = ((eax >> 9) & 0x3c) ^ 0x3c;
195 edi = (ebx & 0x3800) ^ 0x1000; // bswap
196 eax += (ebx >> 8) & 0x40;
198 case 0x07: // No_Flip_270, 32x32 dots
199 eax = ((eax >> 9) & 0x7c) ^ 0x7c;
201 edi = (ebx & 0x3800) ^ 0x1000; // bswap
202 eax += (ebx >> 7) & 0x180;
204 case 0x08: // Flip_0, 16x16 dots
205 ebx = (ebx >> 9) & 0x3c;
207 edi = (eax & 0x3800) ^ 0x2800; // bswap, flip
208 eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
210 case 0x09: // Flip_0, 32x32 dots
211 ebx = (ebx >> 9) & 0x7c;
213 edi = (eax & 0x3800) ^ 0x2800; // bswap, flip
214 eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
216 case 0x0a: // Flip_90, 16x16 dots
217 eax = ((eax >> 9) & 0x3c) ^ 0x3c;
219 edi = (ebx & 0x3800) ^ 0x2800; // bswap, flip
220 eax += ((ebx >> 8) & 0x40) ^ 0x40;
222 case 0x0b: // Flip_90, 32x32 dots
223 eax = ((eax >> 9) & 0x7c) ^ 0x7c;
225 edi = (ebx & 0x3800) ^ 0x2800; // bswap, flip
226 eax += ((ebx >> 7) & 0x180) ^ 0x180;
228 case 0x0c: // Flip_180, 16x16 dots
229 ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
231 edi = (eax & 0x3800) ^ 0x1000; // bswap
232 eax = ((eax >> 8) & 0x40) + ebx;
234 case 0x0d: // Flip_180, 32x32 dots
235 ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
237 edi = (eax & 0x3800) ^ 0x1000; // bswap
238 eax = ((eax >> 7) & 0x180) + ebx;
240 case 0x0e: // Flip_270, 16x16 dots
241 eax = (eax >> 9) & 0x3c;
243 edi = (ebx & 0x3800) ^ 0x1000; // bswap, flip
244 eax += (ebx >> 8) & 0x40;
246 case 0x0f: // Flip_270, 32x32 dots
247 eax = (eax >> 9) & 0x7c;
249 edi = (ebx & 0x3800) ^ 0x1000; // bswap, flip
250 eax += (ebx >> 7) & 0x180;
254 pixel = *(Pico_mcd->word_ram2M + (edi >> 12) + eax);
255 if (!(edi & 0x800)) pixel >>= 4;
259 if (!pixel && (func & 0x18)) goto Next_Pixel;
260 esi = Buffer_Adr + ((XD>>1)^1); // pixel addr
261 eax = *(Pico_mcd->word_ram2M + esi); // old pixel
264 if ((eax & 0x0f) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
265 *(Pico_mcd->word_ram2M + esi) = pixel | (eax & 0xf0);
269 if ((eax & 0xf0) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
270 *(Pico_mcd->word_ram2M + esi) = (pixel << 4) | (eax & 0xf);
275 ecx += (DYXS << 16) >> 16; // _rot_comp.DXS;
276 edx += DYXS >> 16; // _rot_comp.DYS;
280 Buffer_Adr += ((_rot_comp.Reg_5C & 0x1f) + 1) << 5;
290 // _rot_comp.V_Dot--; // will be done by caller
294 PICO_INTERNAL void gfx_cd_update(void)
296 int V_Dot = _rot_comp.Reg_64 & 0xff;
299 dprintf("gfx_cd_update, Reg_64 = %04x", _rot_comp.Reg_64);
307 jobs = _rot_comp.Float_Part >> 16;
311 _rot_comp.Float_Part += _rot_comp.Draw_Speed;
315 _rot_comp.Float_Part &= 0xffff;
316 _rot_comp.Float_Part += _rot_comp.Draw_Speed;
318 if (PicoOpt & POPT_EN_MCD_GFX)
320 unsigned int func = _rot_comp.Function;
321 unsigned int H_Dot = _rot_comp.Reg_62 & 0x1ff;
322 unsigned short *stamp_base = (unsigned short *) (Pico_mcd->word_ram2M + _rot_comp.Stamp_Map_Adr);
326 gfx_do(func, stamp_base, H_Dot); // jmp [Jmp_Adr]:
328 V_Dot--; // dec byte [V_Dot]
347 _rot_comp.Reg_64 = V_Dot;
351 PICO_INTERNAL_ASM unsigned int gfx_cd_read(unsigned int a)
356 case 0x58: d = _rot_comp.Reg_58; break;
357 case 0x5A: d = _rot_comp.Reg_5A; break;
358 case 0x5C: d = _rot_comp.Reg_5C; break;
359 case 0x5E: d = _rot_comp.Reg_5E; break;
360 case 0x60: d = _rot_comp.Reg_60; break;
361 case 0x62: d = _rot_comp.Reg_62; break;
362 case 0x64: d = _rot_comp.Reg_64; break;
364 default: dprintf("gfx_cd_read FIXME: unexpected address: %02x", a); break;
367 dprintf("gfx_cd_read(%02x) = %04x", a, d);
372 PICO_INTERNAL_ASM void gfx_cd_write16(unsigned int a, unsigned int d)
374 dprintf("gfx_cd_write16(%x, %04x)", a, d);
377 case 0x58: // .Reg_Stamp_Size
378 _rot_comp.Reg_58 = d & 7;
381 case 0x5A: // .Reg_Stamp_Adr
382 _rot_comp.Reg_5A = d & 0xffe0;
385 case 0x5C: // .Reg_IM_VCell_Size
386 _rot_comp.Reg_5C = d & 0x1f;
389 case 0x5E: // .Reg_IM_Adr
390 _rot_comp.Reg_5E = d & 0xFFF8;
393 case 0x60: // .Reg_IM_Offset
394 _rot_comp.Reg_60 = d & 0x3f;
397 case 0x62: // .Reg_IM_HDot_Size
398 _rot_comp.Reg_62 = d & 0x1ff;
401 case 0x64: // .Reg_IM_VDot_Size
402 _rot_comp.Reg_64 = d & 0xff; // V_Dot, must be 32bit?
405 case 0x66: // .Reg_Vector_Adr
406 _rot_comp.Reg_66 = d & 0xfffe;
407 if (Pico_mcd->s68k_regs[3]&4) return; // can't do tanformations in 1M mode
411 default: dprintf("gfx_cd_write16 FIXME: unexpected address: %02x", a); return;
416 PICO_INTERNAL void gfx_cd_reset(void)
418 memset(&_rot_comp.Reg_58, 0, sizeof(_rot_comp));
422 // --------------------------------
424 #include "cell_map.c"
426 #ifndef UTYPES_DEFINED
427 typedef unsigned short u16;
430 // check: Heart of the alien, jaguar xj 220
431 PICO_INTERNAL void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc)
434 unsigned int asrc, a2;
437 base = Pico_mcd->word_ram1M[Pico_mcd->s68k_regs[3]&1];
439 switch (Pico.video.type)
445 asrc = cell_map(source >> 2) << 2;
447 // if(a&1) d=(d<<8)|(d>>8); // ??
448 r[a>>1] = *(u16 *)(base + asrc);
453 rendstatus |= PDRAW_SPRITES_MOVED;
459 for(a2=a&0x7f; len; len--)
461 asrc = cell_map(source >> 2) << 2;
463 r[a2>>1] = *(u16 *)(base + asrc);
468 if(a2 >= 0x80) break;
473 case 5: // vsram[a&0x003f]=d;
475 for(a2=a&0x7f; len; len--)
477 asrc = cell_map(source >> 2) << 2;
479 r[a2>>1] = *(u16 *)(base + asrc);
484 if(a2 >= 0x80) break;
490 Pico.video.addr=(u16)a;