6cadc2da |
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 |
4 | |
5 | // (c) Copyright 2007, Grazvydas "notaz" Ignotas |
6 | |
cb4a513a |
7 | |
efcba75f |
8 | #include "../pico_int.h" |
cb4a513a |
9 | |
9c9cda8c |
10 | #undef dprintf |
11 | #define dprintf(...) |
12 | |
87650acd |
13 | #define UPDATE_CYCLES 20000 |
14 | |
eff55556 |
15 | #define _rot_comp Pico_mcd->rot_comp |
d1df8786 |
16 | |
ae214f1c |
17 | static void gfx_do_line(unsigned int func, unsigned short *stamp_base, |
18 | unsigned int H_Dot); |
d1df8786 |
19 | |
cb4a513a |
20 | static void gfx_cd_start(void) |
21 | { |
87650acd |
22 | int w, h, cycles; |
23 | int y_step; |
ae214f1c |
24 | |
25 | w = _rot_comp.Reg_62; |
26 | h = _rot_comp.Reg_64; |
27 | if (w == 0 || h == 0) { |
28 | elprintf(EL_CD|EL_ANOMALY, "gfx_cd_start with %ux%u", w, h); |
29 | _rot_comp.Reg_64 = 0; |
30 | // irq? |
31 | return; |
32 | } |
d1df8786 |
33 | |
eff55556 |
34 | // _rot_comp.XD_Mul = ((_rot_comp.Reg_5C & 0x1f) + 1) * 4; // unused |
35 | _rot_comp.Function = (_rot_comp.Reg_58 & 7) | (Pico_mcd->s68k_regs[3] & 0x18); // Jmp_Adr |
36 | // _rot_comp.Buffer_Adr = (_rot_comp.Reg_5E & 0xfff8) << 2; // unused? |
37 | _rot_comp.YD = (_rot_comp.Reg_60 >> 3) & 7; |
38 | _rot_comp.Vector_Adr = (_rot_comp.Reg_66 & 0xfffe) << 2; |
a4030801 |
39 | |
eff55556 |
40 | switch (_rot_comp.Reg_58 & 6) // Scr_16? |
a4030801 |
41 | { |
42 | case 0: // ? |
eff55556 |
43 | _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xff80) << 2; |
a4030801 |
44 | break; |
45 | case 2: // .Dot_32 |
eff55556 |
46 | _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xffe0) << 2; |
a4030801 |
47 | break; |
48 | case 4: // .Scr_16 |
eff55556 |
49 | _rot_comp.Stamp_Map_Adr = 0x20000; |
a4030801 |
50 | break; |
51 | case 6: // .Scr_16_Dot_32 |
eff55556 |
52 | _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xe000) << 2; |
a4030801 |
53 | break; |
54 | } |
55 | |
87650acd |
56 | _rot_comp.Reg_58 |= 0x8000; // Stamp_Size, we start a new GFX operation |
57 | |
58 | cycles = 5 * w * h; |
59 | if (cycles > UPDATE_CYCLES) |
60 | y_step = (UPDATE_CYCLES + 5 * w - 1) / (5 * w); |
61 | else |
62 | y_step = h; |
63 | |
64 | _rot_comp.y_step = y_step; |
65 | pcd_event_schedule_s68k(PCD_EVENT_GFX, 5 * w * y_step); |
66 | } |
67 | |
68 | void gfx_cd_update(unsigned int cycles) |
69 | { |
70 | int w = _rot_comp.Reg_62; |
71 | int h, next; |
72 | |
73 | if (!(Pico_mcd->rot_comp.Reg_58 & 0x8000)) |
74 | return; |
75 | |
76 | h = _rot_comp.Reg_64; |
77 | _rot_comp.Reg_64 -= _rot_comp.y_step; |
78 | |
79 | if ((int)_rot_comp.Reg_64 <= 0) { |
80 | Pico_mcd->rot_comp.Reg_58 &= 0x7fff; |
81 | Pico_mcd->rot_comp.Reg_64 = 0; |
82 | if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN1) { |
83 | elprintf(EL_INTS |EL_CD, "s68k: gfx_cd irq 1"); |
84 | SekInterruptS68k(1); |
85 | } |
86 | } |
87 | else { |
88 | next = _rot_comp.Reg_64; |
89 | if (next > _rot_comp.y_step) |
90 | next = _rot_comp.y_step; |
91 | |
92 | pcd_event_schedule(cycles, PCD_EVENT_GFX, 5 * w * next); |
93 | h = _rot_comp.y_step; |
94 | } |
95 | |
ae214f1c |
96 | if (PicoOpt & POPT_EN_MCD_GFX) |
97 | { |
98 | unsigned int func = _rot_comp.Function; |
87650acd |
99 | unsigned short *stamp_base = (unsigned short *) |
100 | (Pico_mcd->word_ram2M + _rot_comp.Stamp_Map_Adr); |
c008977e |
101 | |
ae214f1c |
102 | while (h--) |
103 | gfx_do_line(func, stamp_base, w); |
104 | } |
d1df8786 |
105 | } |
106 | |
ae214f1c |
107 | PICO_INTERNAL_ASM unsigned int gfx_cd_read(unsigned int a) |
d1df8786 |
108 | { |
ae214f1c |
109 | unsigned int d = 0; |
110 | |
111 | switch (a) { |
112 | case 0x58: d = _rot_comp.Reg_58; break; |
113 | case 0x5A: d = _rot_comp.Reg_5A; break; |
114 | case 0x5C: d = _rot_comp.Reg_5C; break; |
115 | case 0x5E: d = _rot_comp.Reg_5E; break; |
116 | case 0x60: d = _rot_comp.Reg_60; break; |
117 | case 0x62: d = _rot_comp.Reg_62; break; |
87650acd |
118 | case 0x64: d = _rot_comp.Reg_64; break; |
ae214f1c |
119 | case 0x66: break; |
120 | default: dprintf("gfx_cd_read FIXME: unexpected address: %02x", a); break; |
cb4a513a |
121 | } |
cb4a513a |
122 | |
ae214f1c |
123 | dprintf("gfx_cd_read(%02x) = %04x", a, d); |
124 | |
125 | return d; |
126 | |
127 | } |
d1df8786 |
128 | |
ae214f1c |
129 | static void gfx_do_line(unsigned int func, unsigned short *stamp_base, |
130 | unsigned int H_Dot) |
a4030801 |
131 | { |
528ec956 |
132 | unsigned int eax, ebx, ecx, edx, esi, edi, pixel; |
00bd648e |
133 | unsigned int XD, Buffer_Adr; |
528ec956 |
134 | int DYXS; |
a4030801 |
135 | |
eff55556 |
136 | XD = _rot_comp.Reg_60 & 7; |
137 | Buffer_Adr = ((_rot_comp.Reg_5E & 0xfff8) + _rot_comp.YD) << 2; |
138 | ecx = *(unsigned int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr); |
a4030801 |
139 | edx = ecx >> 16; |
140 | ecx = (ecx & 0xffff) << 8; |
141 | edx <<= 8; |
eff55556 |
142 | DYXS = *(int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr + 4); |
143 | _rot_comp.Vector_Adr += 8; |
a4030801 |
144 | |
145 | // MAKE_IMAGE_LINE |
528ec956 |
146 | while (H_Dot) |
a4030801 |
147 | { |
c008977e |
148 | // MAKE_IMAGE_PIXEL |
149 | if (!(func & 1)) // NOT TILED |
150 | { |
151 | int mask = (func & 4) ? 0x00800000 : 0x00f80000; |
152 | if ((ecx | edx) & mask) |
153 | { |
154 | if (func & 0x18) goto Next_Pixel; |
155 | pixel = 0; |
156 | goto Pixel_Out; |
157 | } |
158 | } |
159 | |
a4030801 |
160 | if (func & 2) // mode 32x32 dot |
161 | { |
162 | if (func & 4) // 16x16 screen |
163 | { |
00bd648e |
164 | ebx = ((ecx >> (11+5)) & 0x007f) | |
165 | ((edx >> (11-2)) & 0x3f80); |
a4030801 |
166 | } |
167 | else // 1x1 screen |
168 | { |
00bd648e |
169 | ebx = ((ecx >> (11+5)) & 0x07) | |
170 | ((edx >> (11+2)) & 0x38); |
a4030801 |
171 | } |
172 | } |
173 | else // mode 16x16 dot |
174 | { |
175 | if (func & 4) // 16x16 screen |
176 | { |
00bd648e |
177 | ebx = ((ecx >> (11+4)) & 0x00ff) | |
178 | ((edx >> (11-4)) & 0xff00); |
a4030801 |
179 | } |
180 | else // 1x1 screen |
181 | { |
00bd648e |
182 | ebx = ((ecx >> (11+4)) & 0x0f) | |
183 | ((edx >> (11+0)) & 0xf0); |
a4030801 |
184 | } |
185 | } |
a4030801 |
186 | |
c008977e |
187 | edi = stamp_base[ebx]; |
00bd648e |
188 | esi = (edi & 0x7ff) << 7; |
528ec956 |
189 | if (!esi) { pixel = 0; goto Pixel_Out; } |
00bd648e |
190 | edi >>= (11+1); |
a4030801 |
191 | edi &= (0x1c>>1); |
192 | eax = ecx; |
193 | ebx = edx; |
194 | if (func & 2) edi |= 1; // 32 dots? |
195 | switch (edi) |
196 | { |
197 | case 0x00: // No_Flip_0, 16x16 dots |
198 | ebx = (ebx >> 9) & 0x3c; |
199 | ebx += esi; |
200 | edi = (eax & 0x3800) ^ 0x1000; // bswap |
201 | eax = ((eax >> 8) & 0x40) + ebx; |
a4030801 |
202 | break; |
203 | case 0x01: // No_Flip_0, 32x32 dots |
204 | ebx = (ebx >> 9) & 0x7c; |
205 | ebx += esi; |
206 | edi = (eax & 0x3800) ^ 0x1000; // bswap |
207 | eax = ((eax >> 7) & 0x180) + ebx; |
a4030801 |
208 | break; |
209 | case 0x02: // No_Flip_90, 16x16 dots |
210 | eax = (eax >> 9) & 0x3c; |
211 | eax += esi; |
212 | edi = (ebx & 0x3800) ^ 0x2800; // bswap |
213 | eax += ((ebx >> 8) & 0x40) ^ 0x40; |
a4030801 |
214 | break; |
215 | case 0x03: // No_Flip_90, 32x32 dots |
216 | eax = (eax >> 9) & 0x7c; |
217 | eax += esi; |
218 | edi = (ebx & 0x3800) ^ 0x2800; // bswap |
01bc6b19 |
219 | eax += ((ebx >> 7) & 0x180) ^ 0x180; |
a4030801 |
220 | break; |
221 | case 0x04: // No_Flip_180, 16x16 dots |
222 | ebx = ((ebx >> 9) & 0x3c) ^ 0x3c; |
223 | ebx += esi; |
224 | edi = (eax & 0x3800) ^ 0x2800; // bswap and flip |
225 | eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx; |
a4030801 |
226 | break; |
227 | case 0x05: // No_Flip_180, 32x32 dots |
228 | ebx = ((ebx >> 9) & 0x7c) ^ 0x7c; |
229 | ebx += esi; |
230 | edi = (eax & 0x3800) ^ 0x2800; // bswap and flip |
231 | eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx; |
a4030801 |
232 | break; |
233 | case 0x06: // No_Flip_270, 16x16 dots |
234 | eax = ((eax >> 9) & 0x3c) ^ 0x3c; |
235 | eax += esi; |
236 | edi = (ebx & 0x3800) ^ 0x1000; // bswap |
237 | eax += (ebx >> 8) & 0x40; |
a4030801 |
238 | break; |
239 | case 0x07: // No_Flip_270, 32x32 dots |
240 | eax = ((eax >> 9) & 0x7c) ^ 0x7c; |
241 | eax += esi; |
242 | edi = (ebx & 0x3800) ^ 0x1000; // bswap |
243 | eax += (ebx >> 7) & 0x180; |
a4030801 |
244 | break; |
245 | case 0x08: // Flip_0, 16x16 dots |
01bc6b19 |
246 | ebx = (ebx >> 9) & 0x3c; |
a4030801 |
247 | ebx += esi; |
248 | edi = (eax & 0x3800) ^ 0x2800; // bswap, flip |
249 | eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx; |
a4030801 |
250 | break; |
251 | case 0x09: // Flip_0, 32x32 dots |
01bc6b19 |
252 | ebx = (ebx >> 9) & 0x7c; |
a4030801 |
253 | ebx += esi; |
254 | edi = (eax & 0x3800) ^ 0x2800; // bswap, flip |
255 | eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx; |
a4030801 |
256 | break; |
257 | case 0x0a: // Flip_90, 16x16 dots |
258 | eax = ((eax >> 9) & 0x3c) ^ 0x3c; |
259 | eax += esi; |
260 | edi = (ebx & 0x3800) ^ 0x2800; // bswap, flip |
261 | eax += ((ebx >> 8) & 0x40) ^ 0x40; |
a4030801 |
262 | break; |
263 | case 0x0b: // Flip_90, 32x32 dots |
264 | eax = ((eax >> 9) & 0x7c) ^ 0x7c; |
265 | eax += esi; |
266 | edi = (ebx & 0x3800) ^ 0x2800; // bswap, flip |
267 | eax += ((ebx >> 7) & 0x180) ^ 0x180; |
a4030801 |
268 | break; |
269 | case 0x0c: // Flip_180, 16x16 dots |
270 | ebx = ((ebx >> 9) & 0x3c) ^ 0x3c; |
271 | ebx += esi; |
272 | edi = (eax & 0x3800) ^ 0x1000; // bswap |
273 | eax = ((eax >> 8) & 0x40) + ebx; |
a4030801 |
274 | break; |
275 | case 0x0d: // Flip_180, 32x32 dots |
276 | ebx = ((ebx >> 9) & 0x7c) ^ 0x7c; |
277 | ebx += esi; |
278 | edi = (eax & 0x3800) ^ 0x1000; // bswap |
279 | eax = ((eax >> 7) & 0x180) + ebx; |
a4030801 |
280 | break; |
281 | case 0x0e: // Flip_270, 16x16 dots |
282 | eax = (eax >> 9) & 0x3c; |
283 | eax += esi; |
284 | edi = (ebx & 0x3800) ^ 0x1000; // bswap, flip |
285 | eax += (ebx >> 8) & 0x40; |
a4030801 |
286 | break; |
287 | case 0x0f: // Flip_270, 32x32 dots |
288 | eax = (eax >> 9) & 0x7c; |
289 | eax += esi; |
290 | edi = (ebx & 0x3800) ^ 0x1000; // bswap, flip |
291 | eax += (ebx >> 7) & 0x180; |
a4030801 |
292 | break; |
293 | } |
294 | |
01bc6b19 |
295 | pixel = *(Pico_mcd->word_ram2M + (edi >> 12) + eax); |
296 | if (!(edi & 0x800)) pixel >>= 4; |
528ec956 |
297 | else pixel &= 0x0f; |
01bc6b19 |
298 | |
a4030801 |
299 | Pixel_Out: |
a4030801 |
300 | if (!pixel && (func & 0x18)) goto Next_Pixel; |
528ec956 |
301 | esi = Buffer_Adr + ((XD>>1)^1); // pixel addr |
a4030801 |
302 | eax = *(Pico_mcd->word_ram2M + esi); // old pixel |
528ec956 |
303 | if (XD & 1) |
a4030801 |
304 | { |
305 | if ((eax & 0x0f) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite |
306 | *(Pico_mcd->word_ram2M + esi) = pixel | (eax & 0xf0); |
307 | } |
308 | else |
309 | { |
310 | if ((eax & 0xf0) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite |
311 | *(Pico_mcd->word_ram2M + esi) = (pixel << 4) | (eax & 0xf); |
312 | } |
313 | |
314 | |
315 | Next_Pixel: |
eff55556 |
316 | ecx += (DYXS << 16) >> 16; // _rot_comp.DXS; |
317 | edx += DYXS >> 16; // _rot_comp.DYS; |
528ec956 |
318 | XD++; |
319 | if (XD >= 8) |
a4030801 |
320 | { |
eff55556 |
321 | Buffer_Adr += ((_rot_comp.Reg_5C & 0x1f) + 1) << 5; |
528ec956 |
322 | XD = 0; |
a4030801 |
323 | } |
528ec956 |
324 | H_Dot--; |
a4030801 |
325 | } |
528ec956 |
326 | // end while |
a4030801 |
327 | |
328 | |
00bd648e |
329 | // nothing_to_draw: |
eff55556 |
330 | _rot_comp.YD++; |
331 | // _rot_comp.V_Dot--; // will be done by caller |
a4030801 |
332 | } |
d1df8786 |
333 | |
334 | |
eff55556 |
335 | PICO_INTERNAL_ASM void gfx_cd_write16(unsigned int a, unsigned int d) |
cb4a513a |
336 | { |
5c69a605 |
337 | dprintf("gfx_cd_write16(%x, %04x)", a, d); |
cb4a513a |
338 | |
ae214f1c |
339 | if (_rot_comp.Reg_58 & 0x8000) |
340 | elprintf(EL_CD|EL_ANOMALY, "cd: busy gfx reg write %02x %04x", a, d); |
341 | |
cb4a513a |
342 | switch (a) { |
d1df8786 |
343 | case 0x58: // .Reg_Stamp_Size |
eff55556 |
344 | _rot_comp.Reg_58 = d & 7; |
d1df8786 |
345 | return; |
346 | |
347 | case 0x5A: // .Reg_Stamp_Adr |
eff55556 |
348 | _rot_comp.Reg_5A = d & 0xffe0; |
d1df8786 |
349 | return; |
350 | |
351 | case 0x5C: // .Reg_IM_VCell_Size |
eff55556 |
352 | _rot_comp.Reg_5C = d & 0x1f; |
d1df8786 |
353 | return; |
354 | |
355 | case 0x5E: // .Reg_IM_Adr |
eff55556 |
356 | _rot_comp.Reg_5E = d & 0xFFF8; |
d1df8786 |
357 | return; |
358 | |
359 | case 0x60: // .Reg_IM_Offset |
eff55556 |
360 | _rot_comp.Reg_60 = d & 0x3f; |
d1df8786 |
361 | return; |
362 | |
363 | case 0x62: // .Reg_IM_HDot_Size |
eff55556 |
364 | _rot_comp.Reg_62 = d & 0x1ff; |
d1df8786 |
365 | return; |
366 | |
367 | case 0x64: // .Reg_IM_VDot_Size |
eff55556 |
368 | _rot_comp.Reg_64 = d & 0xff; // V_Dot, must be 32bit? |
d1df8786 |
369 | return; |
370 | |
371 | case 0x66: // .Reg_Vector_Adr |
eff55556 |
372 | _rot_comp.Reg_66 = d & 0xfffe; |
cb4a513a |
373 | if (Pico_mcd->s68k_regs[3]&4) return; // can't do tanformations in 1M mode |
374 | gfx_cd_start(); |
375 | return; |
d1df8786 |
376 | |
5c69a605 |
377 | default: dprintf("gfx_cd_write16 FIXME: unexpected address: %02x", a); return; |
cb4a513a |
378 | } |
379 | } |
380 | |
d1df8786 |
381 | |
eff55556 |
382 | PICO_INTERNAL void gfx_cd_reset(void) |
51a902ae |
383 | { |
eff55556 |
384 | memset(&_rot_comp.Reg_58, 0, sizeof(_rot_comp)); |
fa1e5e29 |
385 | } |
386 | |
387 | |
388 | // -------------------------------- |
389 | |
390 | #include "cell_map.c" |
391 | |
eff55556 |
392 | #ifndef UTYPES_DEFINED |
fa1e5e29 |
393 | typedef unsigned short u16; |
eff55556 |
394 | #endif |
fa1e5e29 |
395 | |
0a051f55 |
396 | // check: Heart of the alien, jaguar xj 220 |
eff55556 |
397 | PICO_INTERNAL void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc) |
fa1e5e29 |
398 | { |
399 | unsigned char *base; |
400 | unsigned int asrc, a2; |
401 | u16 *r; |
402 | |
403 | base = Pico_mcd->word_ram1M[Pico_mcd->s68k_regs[3]&1]; |
404 | |
405 | switch (Pico.video.type) |
406 | { |
407 | case 1: // vram |
408 | r = Pico.vram; |
409 | for(; len; len--) |
410 | { |
411 | asrc = cell_map(source >> 2) << 2; |
412 | asrc |= source & 2; |
413 | // if(a&1) d=(d<<8)|(d>>8); // ?? |
414 | r[a>>1] = *(u16 *)(base + asrc); |
415 | source += 2; |
416 | // AutoIncrement |
417 | a=(u16)(a+inc); |
418 | } |
602133e1 |
419 | rendstatus |= PDRAW_SPRITES_MOVED; |
fa1e5e29 |
420 | break; |
421 | |
422 | case 3: // cram |
423 | Pico.m.dirtyPal = 1; |
424 | r = Pico.cram; |
425 | for(a2=a&0x7f; len; len--) |
426 | { |
427 | asrc = cell_map(source >> 2) << 2; |
428 | asrc |= source & 2; |
429 | r[a2>>1] = *(u16 *)(base + asrc); |
430 | source += 2; |
431 | // AutoIncrement |
432 | a2+=inc; |
433 | // good dest? |
434 | if(a2 >= 0x80) break; |
435 | } |
436 | a=(a&0xff00)|a2; |
437 | break; |
438 | |
439 | case 5: // vsram[a&0x003f]=d; |
440 | r = Pico.vsram; |
441 | for(a2=a&0x7f; len; len--) |
442 | { |
443 | asrc = cell_map(source >> 2) << 2; |
444 | asrc |= source & 2; |
445 | r[a2>>1] = *(u16 *)(base + asrc); |
446 | source += 2; |
447 | // AutoIncrement |
448 | a2+=inc; |
449 | // good dest? |
450 | if(a2 >= 0x80) break; |
451 | } |
452 | a=(a&0xff00)|a2; |
453 | break; |
454 | } |
455 | // remember addr |
456 | Pico.video.addr=(u16)a; |
51a902ae |
457 | } |
458 | |