bugfix
[picodrive.git] / platform / gizmondo / emu.c
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.
28 unsigned char gfx_buffer[321*240*2*2];
29 unsigned char *PicoDraw2FB = gfx_buffer;  // temporary buffer for alt renderer ( (8+320)*(8+240+8) )
30
31 static short *snd_cbuff = NULL;
32 static int snd_cbuf_samples = 0, snd_all_samples = 0;
33
34
35 static void blit(const char *fps, const char *notice);
36 static void clearArea(int full);
37
38 int plat_get_root_dir(char *dst, int len)
39 {
40         if (len > 0) *dst = 0;
41
42         return 0;
43 }
44
45 static 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
61 void 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
75 void 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
104 static 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
114 static int EmuScanBegin8(unsigned int num)
115 {
116         // draw like the fast renderer
117         HighCol = gfx_buffer + 328 * num;
118
119         return 0;
120 }
121
122 static 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 /*
135 void log1(void *p1, void *p2)
136 {
137         lprintf("%p %p %p\n", p1, p2, DrawLineDest);
138 }
139 */
140
141 static 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
158 static short localPal[0x100];
159
160 static 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)
220 static 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
235 static 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>
268 static 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
282 static 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
297 static void SkipFrame(void)
298 {
299         PicoSkipFrame=1;
300         PicoFrame();
301         PicoSkipFrame=0;
302 }
303
304 /* forced frame to front buffer */
305 void 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
330 static 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
398 static 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
441 void plat_debug_cat(char *str)
442 {
443 }
444
445 static 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
459 void 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