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32x: drc: new smc handling, write handlers adjusted.
[picodrive.git] / platform / gizmondo / emu.c
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1#include <windows.h>
2#include <string.h>
3
4#include <sys/stat.h> // mkdir
5#include <sys/types.h>
6
7#include "kgsdk/Framework.h"
8#include "kgsdk/Framework2D.h"
9#include "kgsdk/FrameworkAudio.h"
10#include "../common/emu.h"
11#include "../common/lprintf.h"
12#include "../common/arm_utils.h"
13#include "../common/config.h"
14#include "emu.h"
15#include "menu.h"
16#include "giz.h"
17#include "asm_utils.h"
18
19#include <pico/pico_int.h>
20
21#ifdef BENCHMARK
22#define OSD_FPS_X 220
23#else
24#define OSD_FPS_X 260
25#endif
26
27// main 300K gfx-related buffer. Used by menu and renderers.
28unsigned char gfx_buffer[321*240*2*2];
29unsigned char *PicoDraw2FB = gfx_buffer; // temporary buffer for alt renderer ( (8+320)*(8+240+8) )
30
31static short *snd_cbuff = NULL;
32static int snd_cbuf_samples = 0, snd_all_samples = 0;
33
34
35static void blit(const char *fps, const char *notice);
36static void clearArea(int full);
37
38int plat_get_root_dir(char *dst, int len)
39{
40 if (len > 0) *dst = 0;
41
42 return 0;
43}
44
45static void emu_msg_cb(const char *msg)
46{
47 if (giz_screen != NULL) fb_unlock();
48 giz_screen = fb_lock(1);
49
50 memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
51 emu_text_out16(4, 232, msg);
52 noticeMsgTime = GetTickCount() - 2000;
53
54 /* assumption: emu_msg_cb gets called only when something slow is about to happen */
55 reset_timing = 1;
56
57 fb_unlock();
58 giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
59}
60
61void emu_stateCb(const char *str)
62{
63 if (giz_screen != NULL) fb_unlock();
64 giz_screen = fb_lock(1);
65
66 clearArea(0);
67 blit("", str);
68
69 fb_unlock();
70 giz_screen = NULL;
71
72 Sleep(0); /* yield the CPU, the system may need it */
73}
74
75void pemu_prep_defconfig(void)
76{
77 memset(&defaultConfig, 0, sizeof(defaultConfig));
78 defaultConfig.EmuOpt = 0x1d | 0x680; // | confirm_save, cd_leds, 16bit rend
79 defaultConfig.s_PicoOpt = 0x0f | POPT_EN_MCD_PCM|POPT_EN_MCD_CDDA|POPT_EN_SVP_DRC|POPT_ACC_SPRITES;
80 defaultConfig.s_PsndRate = 22050;
81 defaultConfig.s_PicoRegion = 0; // auto
82 defaultConfig.s_PicoAutoRgnOrder = 0x184; // US, EU, JP
83 defaultConfig.s_PicoCDBuffers = 0;
84 defaultConfig.Frameskip = -1; // auto
85 defaultConfig.volume = 50;
86 defaultConfig.KeyBinds[ 2] = 1<<0; // SACB RLDU
87 defaultConfig.KeyBinds[ 3] = 1<<1;
88 defaultConfig.KeyBinds[ 0] = 1<<2;
89 defaultConfig.KeyBinds[ 1] = 1<<3;
90 defaultConfig.KeyBinds[ 5] = 1<<4;
91 defaultConfig.KeyBinds[ 6] = 1<<5;
92 defaultConfig.KeyBinds[ 7] = 1<<6;
93 defaultConfig.KeyBinds[ 4] = 1<<7;
94 defaultConfig.KeyBinds[13] = 1<<26; // switch rend
95 defaultConfig.KeyBinds[ 8] = 1<<27; // save state
96 defaultConfig.KeyBinds[ 9] = 1<<28; // load state
97 defaultConfig.KeyBinds[12] = 1<<29; // vol up
98 defaultConfig.KeyBinds[11] = 1<<30; // vol down
99 defaultConfig.scaling = 0;
100 defaultConfig.turbo_rate = 15;
101}
102
103
104static int EmuScanBegin16(unsigned int num)
105{
106 DrawLineDest = (unsigned short *) giz_screen + 321 * num;
107
108 if ((currentConfig.EmuOpt&0x4000) && (num&1) == 0) // (Pico.m.frame_count&1))
109 return 1; // skip next line
110
111 return 0;
112}
113
114static int EmuScanBegin8(unsigned int num)
115{
116 // draw like the fast renderer
117 HighCol = gfx_buffer + 328 * num;
118
119 return 0;
120}
121
122static void osd_text(int x, int y, const char *text)
123{
124 int len = strlen(text) * 8 / 2;
125 int *p, h;
126 for (h = 0; h < 8; h++) {
127 p = (int *) ((unsigned short *) giz_screen+x+321*(y+h));
128 p = (int *) ((int)p & ~3); // align
129 memset32(p, 0, len);
130 }
131 emu_text_out16(x, y, text);
132}
133
134/*
135void log1(void *p1, void *p2)
136{
137 lprintf("%p %p %p\n", p1, p2, DrawLineDest);
138}
139*/
140
141static void cd_leds(void)
142{
143 static int old_reg = 0;
144 unsigned int col_g, col_r, *p;
145
146 if (!((Pico_mcd->s68k_regs[0] ^ old_reg) & 3)) return; // no change
147 old_reg = Pico_mcd->s68k_regs[0];
148
149 p = (unsigned int *)((short *)giz_screen + 321*2+4+2);
150 col_g = (old_reg & 2) ? 0x06000600 : 0;
151 col_r = (old_reg & 1) ? 0xc000c000 : 0;
152 *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r; p += 321/2 - 12/2 + 1;
153 *p++ = col_g; p+=3; *p++ = col_r; p += 321/2 - 10/2;
154 *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r;
155}
156
157
158static short localPal[0x100];
159
160static void blit(const char *fps, const char *notice)
161{
162 int emu_opt = currentConfig.EmuOpt;
163
164 if (PicoOpt&0x10)
165 {
166 int lines_flags = 224;
167 // 8bit fast renderer
168 if (Pico.m.dirtyPal) {
169 Pico.m.dirtyPal = 0;
170 vidConvCpyRGB565(localPal, Pico.cram, 0x40);
171 }
172 // a hack for VR
173 if (PicoAHW & PAHW_SVP)
174 memset32((int *)(PicoDraw2FB+328*8+328*223), 0xe0e0e0e0, 328);
175 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
176 if (currentConfig.EmuOpt&0x4000)
177 lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
178 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
179 }
180 else if (!(emu_opt&0x80))
181 {
182 int lines_flags;
183 // 8bit accurate renderer
184 if (Pico.m.dirtyPal) {
185 Pico.m.dirtyPal = 0;
186 vidConvCpyRGB565(localPal, Pico.cram, 0x40);
187 if (Pico.video.reg[0xC]&8) { // shadow/hilight mode
188 //vidConvCpyRGB32sh(localPal+0x40, Pico.cram, 0x40);
189 //vidConvCpyRGB32hi(localPal+0x80, Pico.cram, 0x40); // TODO?
190 memcpy32((void *)(localPal+0xc0), (void *)(localPal+0x40), 0x40*2/4);
191 localPal[0xc0] = 0x0600;
192 localPal[0xd0] = 0xc000;
193 localPal[0xe0] = 0x0000; // reserved pixels for OSD
194 localPal[0xf0] = 0xffff;
195 }
196 /* no support
197 else if (rendstatus & 0x20) { // mid-frame palette changes
198 vidConvCpyRGB565(localPal+0x40, HighPal, 0x40);
199 vidConvCpyRGB565(localPal+0x80, HighPal+0x40, 0x40);
200 } */
201 }
202 lines_flags = (Pico.video.reg[1]&8) ? 240 : 224;
203 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
204 if (currentConfig.EmuOpt&0x4000)
205 lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
206 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
207 }
208
209 if (notice || (emu_opt & 2)) {
210 int h = 232;
211 if (notice) osd_text(4, h, notice);
212 if (emu_opt & 2) osd_text(OSD_FPS_X, h, fps);
213 }
214
215 if ((emu_opt & 0x400) && (PicoAHW & PAHW_MCD))
216 cd_leds();
217}
218
219// clears whole screen or just the notice area (in all buffers)
220static void clearArea(int full)
221{
222 if (giz_screen == NULL)
223 giz_screen = fb_lock(1);
224 if (full) memset32(giz_screen, 0, 320*240*2/4);
225 else memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
226
227 if (currentConfig.EmuOpt&0x8000) {
228 fb_unlock();
229 giz_screen = fb_lock(0);
230 if (full) memset32(giz_screen, 0, 320*240*2/4);
231 else memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
232 }
233}
234
235static void vidResetMode(void)
236{
237 giz_screen = fb_lock(1);
238
239 if (PicoOpt&0x10) {
240 } else if (currentConfig.EmuOpt&0x80) {
241 PicoDrawSetColorFormat(1);
242 PicoScanBegin = EmuScanBegin16;
243 } else {
244 PicoDrawSetColorFormat(-1);
245 PicoScanBegin = EmuScanBegin8;
246 }
247 if ((PicoOpt&0x10) || !(currentConfig.EmuOpt&0x80)) {
248 // setup pal for 8-bit modes
249 localPal[0xc0] = 0x0600;
250 localPal[0xd0] = 0xc000;
251 localPal[0xe0] = 0x0000; // reserved pixels for OSD
252 localPal[0xf0] = 0xffff;
253 }
254 Pico.m.dirtyPal = 1;
255
256 memset32(giz_screen, 0, 321*240*2/4);
257 if (currentConfig.EmuOpt&0x8000) {
258 fb_unlock();
259 giz_screen = fb_lock(0);
260 memset32(giz_screen, 0, 321*240*2/4);
261 }
262 fb_unlock();
263 giz_screen = NULL;
264}
265
266/*
267#include <stdarg.h>
268static void stdbg(const char *fmt, ...)
269{
270 static int cnt = 0;
271 va_list vl;
272
273 sprintf(noticeMsg, "%x ", cnt++);
274 va_start(vl, fmt);
275 vsnprintf(noticeMsg+strlen(noticeMsg), sizeof(noticeMsg)-strlen(noticeMsg), fmt, vl);
276 va_end(vl);
277
278 noticeMsgTime = GetTickCount();
279}
280*/
281
282static void updateSound(int len)
283{
284 if (PicoOpt&8) len<<=1;
285
286 snd_all_samples += len;
287 PsndOut += len;
288 if (PsndOut - snd_cbuff >= snd_cbuf_samples)
289 {
290 //if (PsndOut - snd_cbuff != snd_cbuf_samples)
291 // stdbg("snd diff is %i, not %i", PsndOut - snd_cbuff, snd_cbuf_samples);
292 PsndOut = snd_cbuff;
293 }
294}
295
296
297static void SkipFrame(void)
298{
299 PicoSkipFrame=1;
300 PicoFrame();
301 PicoSkipFrame=0;
302}
303
304/* forced frame to front buffer */
305void pemu_forced_frame(int opts)
306{
307 int po_old = PicoOpt;
308 int eo_old = currentConfig.EmuOpt;
309
310 PicoOpt &= ~0x10;
311 PicoOpt |= opts|POPT_ACC_SPRITES;
312 currentConfig.EmuOpt |= 0x80;
313
314 if (giz_screen == NULL)
315 giz_screen = fb_lock(1);
316
317 PicoDrawSetColorFormat(1);
318 PicoScanBegin = EmuScanBegin16;
319 Pico.m.dirtyPal = 1;
320 PicoFrameDrawOnly();
321
322 fb_unlock();
323 giz_screen = NULL;
324
325 PicoOpt = po_old;
326 currentConfig.EmuOpt = eo_old;
327}
328
329
330static void RunEvents(unsigned int which)
331{
332 if (which & 0x1800) // save or load (but not both)
333 {
334 int do_it = 1;
335
336 if (PsndOut != NULL)
337 FrameworkAudio_SetPause(1);
338 if (giz_screen == NULL)
339 giz_screen = fb_lock(1);
340 if ( emu_check_save_file(state_slot) &&
341 (( (which & 0x1000) && (currentConfig.EmuOpt & 0x800)) || // load
342 (!(which & 0x1000) && (currentConfig.EmuOpt & 0x200))) ) // save
343 {
344 int keys;
345 blit("", (which & 0x1000) ? "LOAD STATE? (PLAY=yes, STOP=no)" : "OVERWRITE SAVE? (PLAY=yes, STOP=no)");
346 while( !((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) )
347 Sleep(50);
348 if (keys & PBTN_STOP) do_it = 0;
349 while( ((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) ) // wait for release
350 Sleep(50);
351 clearArea(0);
352 }
353
354 if (do_it)
355 {
356 osd_text(4, 232, (which & 0x1000) ? "LOADING GAME" : "SAVING GAME");
357 PicoStateProgressCB = emu_stateCb;
358 emu_save_load_game((which & 0x1000) >> 12, 0);
359 PicoStateProgressCB = NULL;
360 Sleep(0);
361 }
362
363 if (PsndOut != NULL)
364 FrameworkAudio_SetPause(0);
365 reset_timing = 1;
366 }
367 if (which & 0x0400) // switch renderer
368 {
369 if (PicoOpt&0x10) { PicoOpt&=~0x10; currentConfig.EmuOpt |= 0x80; }
370 else { PicoOpt|= 0x10; currentConfig.EmuOpt &= ~0x80; }
371
372 vidResetMode();
373
374 if (PicoOpt&0x10) {
375 strcpy(noticeMsg, " 8bit fast renderer");
376 } else if (currentConfig.EmuOpt&0x80) {
377 strcpy(noticeMsg, "16bit accurate renderer");
378 } else {
379 strcpy(noticeMsg, " 8bit accurate renderer");
380 }
381
382 noticeMsgTime = GetTickCount();
383 }
384 if (which & 0x0300)
385 {
386 if(which&0x0200) {
387 state_slot -= 1;
388 if(state_slot < 0) state_slot = 9;
389 } else {
390 state_slot += 1;
391 if(state_slot > 9) state_slot = 0;
392 }
393 sprintf(noticeMsg, "SAVE SLOT %i [%s]", state_slot, emu_check_save_file(state_slot) ? "USED" : "FREE");
394 noticeMsgTime = GetTickCount();
395 }
396}
397
398static void updateKeys(void)
399{
400 unsigned int keys, allActions[2] = { 0, 0 }, events;
401 static unsigned int prevEvents = 0;
402 int i;
403
404 /* FIXME: port to input fw, merge with emu.c:emu_update_input() */
405 keys = Framework_PollGetButtons();
406 if (keys & PBTN_HOME)
407 engineState = PGS_Menu;
408
409 keys &= CONFIGURABLE_KEYS;
410
411 PicoPad[0] = allActions[0] & 0xfff;
412 PicoPad[1] = allActions[1] & 0xfff;
413
414 if (allActions[0] & 0x7000) emu_DoTurbo(&PicoPad[0], allActions[0]);
415 if (allActions[1] & 0x7000) emu_DoTurbo(&PicoPad[1], allActions[1]);
416
417 events = (allActions[0] | allActions[1]) >> 16;
418
419 // volume is treated in special way and triggered every frame
420 if ((events & 0x6000) && PsndOut != NULL)
421 {
422 int vol = currentConfig.volume;
423 if (events & 0x2000) {
424 if (vol < 100) vol++;
425 } else {
426 if (vol > 0) vol--;
427 }
428 FrameworkAudio_SetVolume(vol, vol);
429 sprintf(noticeMsg, "VOL: %02i ", vol);
430 noticeMsgTime = GetTickCount();
431 currentConfig.volume = vol;
432 }
433
434 events &= ~prevEvents;
435 if (events) RunEvents(events);
436 if (movie_data) emu_updateMovie();
437
438 prevEvents = (allActions[0] | allActions[1]) >> 16;
439}
440
441void plat_debug_cat(char *str)
442{
443}
444
445static void simpleWait(DWORD until)
446{
447 DWORD tval;
448 int diff;
449
450 tval = GetTickCount();
451 diff = (int)until - (int)tval;
452 if (diff >= 2)
453 Sleep(diff - 1);
454
455 while ((tval = GetTickCount()) < until && until - tval < 512) // some simple overflow detection
456 spend_cycles(1024*2);
457}
458
459void pemu_loop(void)
460{
461 static int PsndRate_old = 0, PicoOpt_old = 0, pal_old = 0;
462 char fpsbuff[24]; // fps count c string
463 DWORD tval, tval_prev = 0, tval_thissec = 0; // timing
464 int frames_done = 0, frames_shown = 0, oldmodes = 0, sec_ms = 1000;
465 int target_fps, target_frametime, lim_time, tval_diff, i;
466 char *notice = NULL;
467
468 lprintf("entered emu_Loop()\n");
469
470 fpsbuff[0] = 0;
471
472 // make sure we are in correct mode
473 vidResetMode();
474 if (currentConfig.scaling) PicoOpt|=0x4000;
475 else PicoOpt&=~0x4000;
476 Pico.m.dirtyPal = 1;
477 oldmodes = ((Pico.video.reg[12]&1)<<2) ^ 0xc;
478
479 // pal/ntsc might have changed, reset related stuff
480 target_fps = Pico.m.pal ? 50 : 60;
481 target_frametime = Pico.m.pal ? (1000<<8)/50 : (1000<<8)/60+1;
482 reset_timing = 1;
483
484 // prepare CD buffer
485 if (PicoAHW & PAHW_MCD) PicoCDBufferInit();
486
487 // prepare sound stuff
488 PsndOut = NULL;
489 if (currentConfig.EmuOpt & 4)
490 {
491 int ret, snd_excess_add, stereo;
492 if (PsndRate != PsndRate_old || (PicoOpt&0x0b) != (PicoOpt_old&0x0b) || Pico.m.pal != pal_old) {
493 PsndRerate(Pico.m.frame_count ? 1 : 0);
494 }
495 stereo=(PicoOpt&8)>>3;
496 snd_excess_add = ((PsndRate - PsndLen*target_fps)<<16) / target_fps;
497 snd_cbuf_samples = (PsndRate<<stereo) * 16 / target_fps;
498 lprintf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",
499 PsndRate, PsndLen, snd_excess_add, stereo, Pico.m.pal);
500 ret = FrameworkAudio_Init(PsndRate, snd_cbuf_samples, stereo);
501 if (ret != 0) {
502 lprintf("FrameworkAudio_Init() failed: %i\n", ret);
503 sprintf(noticeMsg, "sound init failed (%i), snd disabled", ret);
504 noticeMsgTime = GetTickCount();
505 currentConfig.EmuOpt &= ~4;
506 } else {
507 FrameworkAudio_SetVolume(currentConfig.volume, currentConfig.volume);
508 PicoWriteSound = updateSound;
509 snd_cbuff = FrameworkAudio_56448Buffer();
510 PsndOut = snd_cbuff + snd_cbuf_samples / 2; // start writing at the middle
511 snd_all_samples = 0;
512 PsndRate_old = PsndRate;
513 PicoOpt_old = PicoOpt;
514 pal_old = Pico.m.pal;
515 }
516 }
517
518 // loop?
519 while (engineState == PGS_Running)
520 {
521 int modes;
522
523 tval = GetTickCount();
524 if (reset_timing || tval < tval_prev) {
525 //stdbg("timing reset");
526 reset_timing = 0;
527 tval_thissec = tval;
528 frames_shown = frames_done = 0;
529 }
530
531 // show notice message?
532 if (noticeMsgTime) {
533 static int noticeMsgSum;
534 if (tval - noticeMsgTime > 2000) { // > 2.0 sec
535 noticeMsgTime = 0;
536 clearArea(0);
537 notice = 0;
538 } else {
539 int sum = noticeMsg[0]+noticeMsg[1]+noticeMsg[2];
540 if (sum != noticeMsgSum) { clearArea(0); noticeMsgSum = sum; }
541 notice = noticeMsg;
542 }
543 }
544
545 // check for mode changes
546 modes = ((Pico.video.reg[12]&1)<<2)|(Pico.video.reg[1]&8);
547 if (modes != oldmodes) {
548 oldmodes = modes;
549 clearArea(1);
550 }
551
552 // second passed?
553 if (tval - tval_thissec >= sec_ms)
554 {
555#ifdef BENCHMARK
556 static int bench = 0, bench_fps = 0, bench_fps_s = 0, bfp = 0, bf[4];
557 if(++bench == 10) {
558 bench = 0;
559 bench_fps_s = bench_fps;
560 bf[bfp++ & 3] = bench_fps;
561 bench_fps = 0;
562 }
563 bench_fps += frames_shown;
564 sprintf(fpsbuff, "%02i/%02i/%02i", frames_shown, bench_fps_s, (bf[0]+bf[1]+bf[2]+bf[3])>>2);
565#else
566 if(currentConfig.EmuOpt & 2)
567 sprintf(fpsbuff, "%02i/%02i", frames_shown, frames_done);
568#endif
569 //tval_thissec += 1000;
570 tval_thissec += sec_ms;
571
572 if (PsndOut != NULL)
573 {
574 /* some code which tries to sync things to audio clock, the dirty way */
575 static int audio_skew_prev = 0;
576 int audio_skew, adj, co = 9, shift = 7;
577 audio_skew = snd_all_samples*2 - FrameworkAudio_BufferPos();
578 if (PsndRate == 22050) co = 10;
579 if (PsndRate > 22050) co = 11;
580 if (PicoOpt&8) shift++;
581 if (audio_skew < 0) {
582 adj = -((-audio_skew) >> shift);
583 if (audio_skew > -(6<<co)) adj>>=1;
584 if (audio_skew > -(4<<co)) adj>>=1;
585 if (audio_skew > -(2<<co)) adj>>=1;
586 if (audio_skew > audio_skew_prev) adj>>=2; // going up already
587 } else {
588 adj = audio_skew >> shift;
589 if (audio_skew < (6<<co)) adj>>=1;
590 if (audio_skew < (4<<co)) adj>>=1;
591 if (audio_skew < (2<<co)) adj>>=1;
592 if (audio_skew < audio_skew_prev) adj>>=2;
593 }
594 audio_skew_prev = audio_skew;
595 target_frametime += adj;
596 sec_ms = (target_frametime * target_fps) >> 8;
597 //stdbg("%i %i %i", audio_skew, adj, sec_ms);
598 frames_done = frames_shown = 0;
599 }
600 else if (currentConfig.Frameskip < 0) {
601 frames_done -= target_fps; if (frames_done < 0) frames_done = 0;
602 frames_shown -= target_fps; if (frames_shown < 0) frames_shown = 0;
603 if (frames_shown > frames_done) frames_shown = frames_done;
604 } else {
605 frames_done = frames_shown = 0;
606 }
607 }
608#ifdef PFRAMES
609 sprintf(fpsbuff, "%i", Pico.m.frame_count);
610#endif
611
612 tval_prev = tval;
613 lim_time = (frames_done+1) * target_frametime;
614 if (currentConfig.Frameskip >= 0) // frameskip enabled
615 {
616 for (i = 0; i < currentConfig.Frameskip; i++) {
617 updateKeys();
618 SkipFrame(); frames_done++;
619 if (PsndOut) { // do framelimitting if sound is enabled
620 int tval_diff;
621 tval = GetTickCount();
622 tval_diff = (int)(tval - tval_thissec) << 8;
623 if (tval_diff < lim_time) // we are too fast
624 simpleWait(tval + ((lim_time - tval_diff)>>8));
625 }
626 lim_time += target_frametime;
627 }
628 }
629 else // auto frameskip
630 {
631 int tval_diff;
632 tval = GetTickCount();
633 tval_diff = (int)(tval - tval_thissec) << 8;
634 if (tval_diff > lim_time)
635 {
636 // no time left for this frame - skip
637 if (tval_diff - lim_time >= (300<<8)) {
638 /* something caused a slowdown for us (disk access? cache flush?)
639 * try to recover by resetting timing... */
640 reset_timing = 1;
641 continue;
642 }
643 updateKeys();
644 SkipFrame(); frames_done++;
645 continue;
646 }
647 }
648
649 updateKeys();
650
651 if (currentConfig.EmuOpt&0x80)
652 /* be sure correct framebuffer is locked */
653 giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
654
655 PicoFrame();
656
657 if (giz_screen == NULL)
658 giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
659
660 blit(fpsbuff, notice);
661
662 if (giz_screen != NULL) {
663 fb_unlock();
664 giz_screen = NULL;
665 }
666
667 if (currentConfig.EmuOpt&0x2000)
668 Framework2D_WaitVSync();
669
670 if (currentConfig.EmuOpt&0x8000)
671 fb_flip();
672
673 // check time
674 tval = GetTickCount();
675 tval_diff = (int)(tval - tval_thissec) << 8;
676
677 if (currentConfig.Frameskip < 0 && tval_diff - lim_time >= (300<<8)) // slowdown detection
678 reset_timing = 1;
679 else if (PsndOut != NULL || currentConfig.Frameskip < 0)
680 {
681 // sleep if we are still too fast
682 if (tval_diff < lim_time)
683 {
684 // we are too fast
685 simpleWait(tval + ((lim_time - tval_diff) >> 8));
686 }
687 }
688
689 frames_done++; frames_shown++;
690 }
691
692
693 if (PicoAHW & PAHW_MCD) PicoCDBufferFree();
694
695 if (PsndOut != NULL) {
696 PsndOut = snd_cbuff = NULL;
697 FrameworkAudio_Close();
698 }
699
700 // save SRAM
701 if ((currentConfig.EmuOpt & 1) && SRam.changed) {
702 emu_stateCb("Writing SRAM/BRAM..");
703 emu_save_load_game(0, 1);
704 SRam.changed = 0;
705 }
706}
707
fast MegaDrive/MegaCD/32X emulator