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