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         if (!(Pico.video.reg[1]&8)) num += 8;
 107         DrawLineDest = (unsigned short *) giz_screen + 321 * num;
 108
 109         if ((currentConfig.EmuOpt&0x4000) && (num&1) == 0) // (Pico.m.frame_count&1))
 110                 return 1; // skip next line
 111
 112         return 0;
 113 }
 114
 115 static int EmuScanBegin8(unsigned int num)
 116 {
 117         // draw like the fast renderer
 118         if (!(Pico.video.reg[1]&8)) num += 8;
 119         HighCol = gfx_buffer + 328 * num;
 120
 121         return 0;
 122 }
 123
 124 static void osd_text(int x, int y, const char *text)
 125 {
 126         int len = strlen(text) * 8 / 2;
 127         int *p, h;
 128         for (h = 0; h < 8; h++) {
 129                 p = (int *) ((unsigned short *) giz_screen+x+321*(y+h));
 130                 p = (int *) ((int)p & ~3); // align
 131                 memset32(p, 0, len);
 132         }
 133         emu_text_out16(x, y, text);
 134 }
 135
 136 /*
 137 void log1(void *p1, void *p2)
 138 {
 139         lprintf("%p %p %p\n", p1, p2, DrawLineDest);
 140 }
 141 */
 142
 143 static void cd_leds(void)
 144 {
 145         static int old_reg = 0;
 146         unsigned int col_g, col_r, *p;
 147
 148         if (!((Pico_mcd->s68k_regs[0] ^ old_reg) & 3)) return; // no change
 149         old_reg = Pico_mcd->s68k_regs[0];
 150
 151         p = (unsigned int *)((short *)giz_screen + 321*2+4+2);
 152         col_g = (old_reg & 2) ? 0x06000600 : 0;
 153         col_r = (old_reg & 1) ? 0xc000c000 : 0;
 154         *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r; p += 321/2 - 12/2 + 1;
 155         *p++ = col_g; p+=3; *p++ = col_r; p += 321/2 - 10/2;
 156         *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r;
 157 }
 158
 159
 160 static short localPal[0x100];
 161
 162 static void blit(const char *fps, const char *notice)
 163 {
 164         int emu_opt = currentConfig.EmuOpt;
 165
 166         if (PicoOpt&0x10)
 167         {
 168                 int lines_flags = 224;
 169                 // 8bit fast renderer
 170                 if (Pico.m.dirtyPal) {
 171                         Pico.m.dirtyPal = 0;
 172                         vidConvCpyRGB565(localPal, Pico.cram, 0x40);
 173                 }
 174                 // a hack for VR
 175                 if (PicoRead16Hook == PicoSVPRead16)
 176                         memset32((int *)(PicoDraw2FB+328*8+328*223), 0xe0e0e0e0, 328);
 177                 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
 178                 if (currentConfig.EmuOpt&0x4000)
 179                         lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
 180                 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
 181         }
 182         else if (!(emu_opt&0x80))
 183         {
 184                 int lines_flags;
 185                 // 8bit accurate renderer
 186                 if (Pico.m.dirtyPal) {
 187                         Pico.m.dirtyPal = 0;
 188                         vidConvCpyRGB565(localPal, Pico.cram, 0x40);
 189                         if (Pico.video.reg[0xC]&8) { // shadow/hilight mode
 190                                 //vidConvCpyRGB32sh(localPal+0x40, Pico.cram, 0x40);
 191                                 //vidConvCpyRGB32hi(localPal+0x80, Pico.cram, 0x40); // TODO?
 192                                 memcpy32((void *)(localPal+0xc0), (void *)(localPal+0x40), 0x40*2/4);
 193                                 localPal[0xc0] = 0x0600;
 194                                 localPal[0xd0] = 0xc000;
 195                                 localPal[0xe0] = 0x0000; // reserved pixels for OSD
 196                                 localPal[0xf0] = 0xffff;
 197                         }
 198                         /* no support
 199                         else if (rendstatus & 0x20) { // mid-frame palette changes
 200                                 vidConvCpyRGB565(localPal+0x40, HighPal, 0x40);
 201                                 vidConvCpyRGB565(localPal+0x80, HighPal+0x40, 0x40);
 202                         } */
 203                 }
 204                 lines_flags = (Pico.video.reg[1]&8) ? 240 : 224;
 205                 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
 206                 if (currentConfig.EmuOpt&0x4000)
 207                         lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
 208                 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
 209         }
 210
 211         if (notice || (emu_opt & 2)) {
 212                 int h = 232;
 213                 if (notice)      osd_text(4, h, notice);
 214                 if (emu_opt & 2) osd_text(OSD_FPS_X, h, fps);
 215         }
 216
 217         if ((emu_opt & 0x400) && (PicoAHW & PAHW_MCD))
 218                 cd_leds();
 219 }
 220
 221 // clears whole screen or just the notice area (in all buffers)
 222 static void clearArea(int full)
 223 {
 224         if (giz_screen == NULL)
 225                 giz_screen = fb_lock(1);
 226         if (full) memset32(giz_screen, 0, 320*240*2/4);
 227         else      memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
 228
 229         if (currentConfig.EmuOpt&0x8000) {
 230                 fb_unlock();
 231                 giz_screen = fb_lock(0);
 232                 if (full) memset32(giz_screen, 0, 320*240*2/4);
 233                 else      memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
 234         }
 235 }
 236
 237 static void vidResetMode(void)
 238 {
 239         giz_screen = fb_lock(1);
 240
 241         if (PicoOpt&0x10) {
 242         } else if (currentConfig.EmuOpt&0x80) {
 243                 PicoDrawSetColorFormat(1);
 244                 PicoScanBegin = EmuScanBegin16;
 245         } else {
 246                 PicoDrawSetColorFormat(-1);
 247                 PicoScanBegin = EmuScanBegin8;
 248         }
 249         if ((PicoOpt&0x10) || !(currentConfig.EmuOpt&0x80)) {
 250                 // setup pal for 8-bit modes
 251                 localPal[0xc0] = 0x0600;
 252                 localPal[0xd0] = 0xc000;
 253                 localPal[0xe0] = 0x0000; // reserved pixels for OSD
 254                 localPal[0xf0] = 0xffff;
 255         }
 256         Pico.m.dirtyPal = 1;
 257
 258         memset32(giz_screen, 0, 321*240*2/4);
 259         if (currentConfig.EmuOpt&0x8000) {
 260                 fb_unlock();
 261                 giz_screen = fb_lock(0);
 262                 memset32(giz_screen, 0, 321*240*2/4);
 263         }
 264         fb_unlock();
 265         giz_screen = NULL;
 266 }
 267
 268 /*
 269 #include <stdarg.h>
 270 static void stdbg(const char *fmt, ...)
 271 {
 272         static int cnt = 0;
 273         va_list vl;
 274
 275         sprintf(noticeMsg, "%x ", cnt++);
 276         va_start(vl, fmt);
 277         vsnprintf(noticeMsg+strlen(noticeMsg), sizeof(noticeMsg)-strlen(noticeMsg), fmt, vl);
 278         va_end(vl);
 279
 280         noticeMsgTime = GetTickCount();
 281 }
 282 */
 283
 284 static void updateSound(int len)
 285 {
 286         if (PicoOpt&8) len<<=1;
 287
 288         snd_all_samples += len;
 289         PsndOut += len;
 290         if (PsndOut - snd_cbuff >= snd_cbuf_samples)
 291         {
 292                 //if (PsndOut - snd_cbuff != snd_cbuf_samples)
 293                 //      stdbg("snd diff is %i, not %i", PsndOut - snd_cbuff, snd_cbuf_samples);
 294                 PsndOut = snd_cbuff;
 295         }
 296 }
 297
 298
 299 static void SkipFrame(void)
 300 {
 301         PicoSkipFrame=1;
 302         PicoFrame();
 303         PicoSkipFrame=0;
 304 }
 305
 306 /* forced frame to front buffer */
 307 void pemu_forced_frame(int opts)
 308 {
 309         int po_old = PicoOpt;
 310         int eo_old = currentConfig.EmuOpt;
 311
 312         PicoOpt &= ~0x10;
 313         PicoOpt |= opts|POPT_ACC_SPRITES;
 314         currentConfig.EmuOpt |= 0x80;
 315
 316         if (giz_screen == NULL)
 317                 giz_screen = fb_lock(1);
 318
 319         PicoDrawSetColorFormat(1);
 320         PicoScanBegin = EmuScanBegin16;
 321         Pico.m.dirtyPal = 1;
 322         PicoFrameDrawOnly();
 323
 324         fb_unlock();
 325         giz_screen = NULL;
 326
 327         PicoOpt = po_old;
 328         currentConfig.EmuOpt = eo_old;
 329 }
 330
 331
 332 static void RunEvents(unsigned int which)
 333 {
 334         if (which & 0x1800) // save or load (but not both)
 335         {
 336                 int do_it = 1;
 337
 338                 if (PsndOut != NULL)
 339                         FrameworkAudio_SetPause(1);
 340                 if (giz_screen == NULL)
 341                         giz_screen = fb_lock(1);
 342                 if ( emu_check_save_file(state_slot) &&
 343                                 (( (which & 0x1000) && (currentConfig.EmuOpt & 0x800)) || // load
 344                                  (!(which & 0x1000) && (currentConfig.EmuOpt & 0x200))) ) // save
 345                 {
 346                         int keys;
 347                         blit("", (which & 0x1000) ? "LOAD STATE? (PLAY=yes, STOP=no)" : "OVERWRITE SAVE? (PLAY=yes, STOP=no)");
 348                         while( !((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) )
 349                                 Sleep(50);
 350                         if (keys & PBTN_STOP) do_it = 0;
 351                         while(  ((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) ) // wait for release
 352                                 Sleep(50);
 353                         clearArea(0);
 354                 }
 355
 356                 if (do_it)
 357                 {
 358                         osd_text(4, 232, (which & 0x1000) ? "LOADING GAME" : "SAVING GAME");
 359                         PicoStateProgressCB = emu_stateCb;
 360                         emu_save_load_game((which & 0x1000) >> 12, 0);
 361                         PicoStateProgressCB = NULL;
 362                         Sleep(0);
 363                 }
 364
 365                 if (PsndOut != NULL)
 366                         FrameworkAudio_SetPause(0);
 367                 reset_timing = 1;
 368         }
 369         if (which & 0x0400) // switch renderer
 370         {
 371                 if (PicoOpt&0x10) { PicoOpt&=~0x10; currentConfig.EmuOpt |=  0x80; }
 372                 else              { PicoOpt|= 0x10; currentConfig.EmuOpt &= ~0x80; }
 373
 374                 vidResetMode();
 375
 376                 if (PicoOpt&0x10) {
 377                         strcpy(noticeMsg, " 8bit fast renderer");
 378                 } else if (currentConfig.EmuOpt&0x80) {
 379                         strcpy(noticeMsg, "16bit accurate renderer");
 380                 } else {
 381                         strcpy(noticeMsg, " 8bit accurate renderer");
 382                 }
 383
 384                 noticeMsgTime = GetTickCount();
 385         }
 386         if (which & 0x0300)
 387         {
 388                 if(which&0x0200) {
 389                         state_slot -= 1;
 390                         if(state_slot < 0) state_slot = 9;
 391                 } else {
 392                         state_slot += 1;
 393                         if(state_slot > 9) state_slot = 0;
 394                 }
 395                 sprintf(noticeMsg, "SAVE SLOT %i [%s]", state_slot, emu_check_save_file(state_slot) ? "USED" : "FREE");
 396                 noticeMsgTime = GetTickCount();
 397         }
 398 }
 399
 400 static void updateKeys(void)
 401 {
 402         unsigned int keys, allActions[2] = { 0, 0 }, events;
 403         static unsigned int prevEvents = 0;
 404         int i;
 405
 406         /* FIXME: port to input fw, merge with emu.c:emu_update_input() */
 407         keys = Framework_PollGetButtons();
 408         if (keys & PBTN_HOME)
 409                 engineState = PGS_Menu;
 410
 411         keys &= CONFIGURABLE_KEYS;
 412
 413         PicoPad[0] = allActions[0] & 0xfff;
 414         PicoPad[1] = allActions[1] & 0xfff;
 415
 416         if (allActions[0] & 0x7000) emu_DoTurbo(&PicoPad[0], allActions[0]);
 417         if (allActions[1] & 0x7000) emu_DoTurbo(&PicoPad[1], allActions[1]);
 418
 419         events = (allActions[0] | allActions[1]) >> 16;
 420
 421         // volume is treated in special way and triggered every frame
 422         if ((events & 0x6000) && PsndOut != NULL)
 423         {
 424                 int vol = currentConfig.volume;
 425                 if (events & 0x2000) {
 426                         if (vol < 100) vol++;
 427                 } else {
 428                         if (vol >   0) vol--;
 429                 }
 430                 FrameworkAudio_SetVolume(vol, vol);
 431                 sprintf(noticeMsg, "VOL: %02i ", vol);
 432                 noticeMsgTime = GetTickCount();
 433                 currentConfig.volume = vol;
 434         }
 435
 436         events &= ~prevEvents;
 437         if (events) RunEvents(events);
 438         if (movie_data) emu_updateMovie();
 439
 440         prevEvents = (allActions[0] | allActions[1]) >> 16;
 441 }
 442
 443 void plat_debug_cat(char *str)
 444 {
 445 }
 446
 447 static void simpleWait(DWORD until)
 448 {
 449         DWORD tval;
 450         int diff;
 451
 452         tval = GetTickCount();
 453         diff = (int)until - (int)tval;
 454         if (diff >= 2)
 455                 Sleep(diff - 1);
 456
 457         while ((tval = GetTickCount()) < until && until - tval < 512) // some simple overflow detection
 458                 spend_cycles(1024*2);
 459 }
 460
 461 void pemu_loop(void)
 462 {
 463         static int PsndRate_old = 0, PicoOpt_old = 0, pal_old = 0;
 464         char fpsbuff[24]; // fps count c string
 465         DWORD tval, tval_prev = 0, tval_thissec = 0; // timing
 466         int frames_done = 0, frames_shown = 0, oldmodes = 0, sec_ms = 1000;
 467         int target_fps, target_frametime, lim_time, tval_diff, i;
 468         char *notice = NULL;
 469
 470         lprintf("entered emu_Loop()\n");
 471
 472         fpsbuff[0] = 0;
 473
 474         // make sure we are in correct mode
 475         vidResetMode();
 476         if (currentConfig.scaling) PicoOpt|=0x4000;
 477         else PicoOpt&=~0x4000;
 478         Pico.m.dirtyPal = 1;
 479         oldmodes = ((Pico.video.reg[12]&1)<<2) ^ 0xc;
 480
 481         // pal/ntsc might have changed, reset related stuff
 482         target_fps = Pico.m.pal ? 50 : 60;
 483         target_frametime = Pico.m.pal ? (1000<<8)/50 : (1000<<8)/60+1;
 484         reset_timing = 1;
 485
 486         // prepare CD buffer
 487         if (PicoAHW & PAHW_MCD) PicoCDBufferInit();
 488
 489         // prepare sound stuff
 490         PsndOut = NULL;
 491         if (currentConfig.EmuOpt & 4)
 492         {
 493                 int ret, snd_excess_add, stereo;
 494                 if (PsndRate != PsndRate_old || (PicoOpt&0x0b) != (PicoOpt_old&0x0b) || Pico.m.pal != pal_old) {
 495                         PsndRerate(Pico.m.frame_count ? 1 : 0);
 496                 }
 497                 stereo=(PicoOpt&8)>>3;
 498                 snd_excess_add = ((PsndRate - PsndLen*target_fps)<<16) / target_fps;
 499                 snd_cbuf_samples = (PsndRate<<stereo) * 16 / target_fps;
 500                 lprintf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",
 501                         PsndRate, PsndLen, snd_excess_add, stereo, Pico.m.pal);
 502                 ret = FrameworkAudio_Init(PsndRate, snd_cbuf_samples, stereo);
 503                 if (ret != 0) {
 504                         lprintf("FrameworkAudio_Init() failed: %i\n", ret);
 505                         sprintf(noticeMsg, "sound init failed (%i), snd disabled", ret);
 506                         noticeMsgTime = GetTickCount();
 507                         currentConfig.EmuOpt &= ~4;
 508                 } else {
 509                         FrameworkAudio_SetVolume(currentConfig.volume, currentConfig.volume);
 510                         PicoWriteSound = updateSound;
 511                         snd_cbuff = FrameworkAudio_56448Buffer();
 512                         PsndOut = snd_cbuff + snd_cbuf_samples / 2; // start writing at the middle
 513                         snd_all_samples = 0;
 514                         PsndRate_old = PsndRate;
 515                         PicoOpt_old  = PicoOpt;
 516                         pal_old = Pico.m.pal;
 517                 }
 518         }
 519
 520         // loop?
 521         while (engineState == PGS_Running)
 522         {
 523                 int modes;
 524
 525                 tval = GetTickCount();
 526                 if (reset_timing || tval < tval_prev) {
 527                         //stdbg("timing reset");
 528                         reset_timing = 0;
 529                         tval_thissec = tval;
 530                         frames_shown = frames_done = 0;
 531                 }
 532
 533                 // show notice message?
 534                 if (noticeMsgTime) {
 535                         static int noticeMsgSum;
 536                         if (tval - noticeMsgTime > 2000) { // > 2.0 sec
 537                                 noticeMsgTime = 0;
 538                                 clearArea(0);
 539                                 notice = 0;
 540                         } else {
 541                                 int sum = noticeMsg[0]+noticeMsg[1]+noticeMsg[2];
 542                                 if (sum != noticeMsgSum) { clearArea(0); noticeMsgSum = sum; }
 543                                 notice = noticeMsg;
 544                         }
 545                 }
 546
 547                 // check for mode changes
 548                 modes = ((Pico.video.reg[12]&1)<<2)|(Pico.video.reg[1]&8);
 549                 if (modes != oldmodes) {
 550                         oldmodes = modes;
 551                         clearArea(1);
 552                 }
 553
 554                 // second passed?
 555                 if (tval - tval_thissec >= sec_ms)
 556                 {
 557 #ifdef BENCHMARK
 558                         static int bench = 0, bench_fps = 0, bench_fps_s = 0, bfp = 0, bf[4];
 559                         if(++bench == 10) {
 560                                 bench = 0;
 561                                 bench_fps_s = bench_fps;
 562                                 bf[bfp++ & 3] = bench_fps;
 563                                 bench_fps = 0;
 564                         }
 565                         bench_fps += frames_shown;
 566                         sprintf(fpsbuff, "%02i/%02i/%02i", frames_shown, bench_fps_s, (bf[0]+bf[1]+bf[2]+bf[3])>>2);
 567 #else
 568                         if(currentConfig.EmuOpt & 2)
 569                                 sprintf(fpsbuff, "%02i/%02i", frames_shown, frames_done);
 570 #endif
 571                         //tval_thissec += 1000;
 572                         tval_thissec += sec_ms;
 573
 574                         if (PsndOut != NULL)
 575                         {
 576                                 /* some code which tries to sync things to audio clock, the dirty way */
 577                                 static int audio_skew_prev = 0;
 578                                 int audio_skew, adj, co = 9, shift = 7;
 579                                 audio_skew = snd_all_samples*2 - FrameworkAudio_BufferPos();
 580                                 if (PsndRate == 22050) co = 10;
 581                                 if (PsndRate  > 22050) co = 11;
 582                                 if (PicoOpt&8) shift++;
 583                                 if (audio_skew < 0) {
 584                                         adj = -((-audio_skew) >> shift);
 585                                         if (audio_skew > -(6<<co)) adj>>=1;
 586                                         if (audio_skew > -(4<<co)) adj>>=1;
 587                                         if (audio_skew > -(2<<co)) adj>>=1;
 588                                         if (audio_skew > audio_skew_prev) adj>>=2; // going up already
 589                                 } else {
 590                                         adj = audio_skew >> shift;
 591                                         if (audio_skew < (6<<co)) adj>>=1;
 592                                         if (audio_skew < (4<<co)) adj>>=1;
 593                                         if (audio_skew < (2<<co)) adj>>=1;
 594                                         if (audio_skew < audio_skew_prev) adj>>=2;
 595                                 }
 596                                 audio_skew_prev = audio_skew;
 597                                 target_frametime += adj;
 598                                 sec_ms = (target_frametime * target_fps) >> 8;
 599                                 //stdbg("%i %i %i", audio_skew, adj, sec_ms);
 600                                 frames_done = frames_shown = 0;
 601                         }
 602                         else if (currentConfig.Frameskip < 0) {
 603                                 frames_done  -= target_fps; if (frames_done  < 0) frames_done  = 0;
 604                                 frames_shown -= target_fps; if (frames_shown < 0) frames_shown = 0;
 605                                 if (frames_shown > frames_done) frames_shown = frames_done;
 606                         } else {
 607                                 frames_done = frames_shown = 0;
 608                         }
 609                 }
 610 #ifdef PFRAMES
 611                 sprintf(fpsbuff, "%i", Pico.m.frame_count);
 612 #endif
 613
 614                 tval_prev = tval;
 615                 lim_time = (frames_done+1) * target_frametime;
 616                 if (currentConfig.Frameskip >= 0) // frameskip enabled
 617                 {
 618                         for (i = 0; i < currentConfig.Frameskip; i++) {
 619                                 updateKeys();
 620                                 SkipFrame(); frames_done++;
 621                                 if (PsndOut) { // do framelimitting if sound is enabled
 622                                         int tval_diff;
 623                                         tval = GetTickCount();
 624                                         tval_diff = (int)(tval - tval_thissec) << 8;
 625                                         if (tval_diff < lim_time) // we are too fast
 626                                                 simpleWait(tval + ((lim_time - tval_diff)>>8));
 627                                 }
 628                                 lim_time += target_frametime;
 629                         }
 630                 }
 631                 else // auto frameskip
 632                 {
 633                         int tval_diff;
 634                         tval = GetTickCount();
 635                         tval_diff = (int)(tval - tval_thissec) << 8;
 636                         if (tval_diff > lim_time)
 637                         {
 638                                 // no time left for this frame - skip
 639                                 if (tval_diff - lim_time >= (300<<8)) {
 640                                         /* something caused a slowdown for us (disk access? cache flush?)
 641                                          * try to recover by resetting timing... */
 642                                         reset_timing = 1;
 643                                         continue;
 644                                 }
 645                                 updateKeys();
 646                                 SkipFrame(); frames_done++;
 647                                 continue;
 648                         }
 649                 }
 650
 651                 updateKeys();
 652
 653                 if (currentConfig.EmuOpt&0x80)
 654                         /* be sure correct framebuffer is locked */
 655                         giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
 656
 657                 PicoFrame();
 658
 659                 if (giz_screen == NULL)
 660                         giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
 661
 662                 blit(fpsbuff, notice);
 663
 664                 if (giz_screen != NULL) {
 665                         fb_unlock();
 666                         giz_screen = NULL;
 667                 }
 668
 669                 if (currentConfig.EmuOpt&0x2000)
 670                         Framework2D_WaitVSync();
 671
 672                 if (currentConfig.EmuOpt&0x8000)
 673                         fb_flip();
 674
 675                 // check time
 676                 tval = GetTickCount();
 677                 tval_diff = (int)(tval - tval_thissec) << 8;
 678
 679                 if (currentConfig.Frameskip < 0 && tval_diff - lim_time >= (300<<8)) // slowdown detection
 680                         reset_timing = 1;
 681                 else if (PsndOut != NULL || currentConfig.Frameskip < 0)
 682                 {
 683                         // sleep if we are still too fast
 684                         if (tval_diff < lim_time)
 685                         {
 686                                 // we are too fast
 687                                 simpleWait(tval + ((lim_time - tval_diff) >> 8));
 688                         }
 689                 }
 690
 691                 frames_done++; frames_shown++;
 692         }
 693
 694
 695         if (PicoAHW & PAHW_MCD) PicoCDBufferFree();
 696
 697         if (PsndOut != NULL) {
 698                 PsndOut = snd_cbuff = NULL;
 699                 FrameworkAudio_Close();
 700         }
 701
 702         // save SRAM
 703         if ((currentConfig.EmuOpt & 1) && SRam.changed) {
 704                 emu_stateCb("Writing SRAM/BRAM..");
 705                 emu_save_load_game(0, 1);
 706                 SRam.changed = 0;
 707         }
 708 }
 709