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         defaultConfig.s_PsndRate = 22050;
  78         defaultConfig.s_PicoCDBuffers = 0;
  79         defaultConfig.KeyBinds[ 2] = 1<<0; // SACB RLDU
  80         defaultConfig.KeyBinds[ 3] = 1<<1;
  81         defaultConfig.KeyBinds[ 0] = 1<<2;
  82         defaultConfig.KeyBinds[ 1] = 1<<3;
  83         defaultConfig.KeyBinds[ 5] = 1<<4;
  84         defaultConfig.KeyBinds[ 6] = 1<<5;
  85         defaultConfig.KeyBinds[ 7] = 1<<6;
  86         defaultConfig.KeyBinds[ 4] = 1<<7;
  87         defaultConfig.KeyBinds[13] = 1<<26; // switch rend
  88         defaultConfig.KeyBinds[ 8] = 1<<27; // save state
  89         defaultConfig.KeyBinds[ 9] = 1<<28; // load state
  90         defaultConfig.KeyBinds[12] = 1<<29; // vol up
  91         defaultConfig.KeyBinds[11] = 1<<30; // vol down
  92         defaultConfig.scaling = 0;
  93 }
  94
  95
  96 static int EmuScanBegin16(unsigned int num)
  97 {
  98         DrawLineDest = (unsigned short *) giz_screen + 321 * num;
  99
 100         if ((currentConfig.EmuOpt&0x4000) && (num&1) == 0) // (Pico.m.frame_count&1))
 101                 return 1; // skip next line
 102
 103         return 0;
 104 }
 105
 106 static int EmuScanBegin8(unsigned int num)
 107 {
 108         // draw like the fast renderer
 109         HighCol = gfx_buffer + 328 * num;
 110
 111         return 0;
 112 }
 113
 114 static void osd_text(int x, int y, const char *text)
 115 {
 116         int len = strlen(text) * 8 / 2;
 117         int *p, h;
 118         for (h = 0; h < 8; h++) {
 119                 p = (int *) ((unsigned short *) giz_screen+x+321*(y+h));
 120                 p = (int *) ((int)p & ~3); // align
 121                 memset32(p, 0, len);
 122         }
 123         emu_text_out16(x, y, text);
 124 }
 125
 126 /*
 127 void log1(void *p1, void *p2)
 128 {
 129         lprintf("%p %p %p\n", p1, p2, DrawLineDest);
 130 }
 131 */
 132
 133 static void cd_leds(void)
 134 {
 135         static int old_reg = 0;
 136         unsigned int col_g, col_r, *p;
 137
 138         if (!((Pico_mcd->s68k_regs[0] ^ old_reg) & 3)) return; // no change
 139         old_reg = Pico_mcd->s68k_regs[0];
 140
 141         p = (unsigned int *)((short *)giz_screen + 321*2+4+2);
 142         col_g = (old_reg & 2) ? 0x06000600 : 0;
 143         col_r = (old_reg & 1) ? 0xc000c000 : 0;
 144         *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r; p += 321/2 - 12/2 + 1;
 145         *p++ = col_g; p+=3; *p++ = col_r; p += 321/2 - 10/2;
 146         *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r;
 147 }
 148
 149
 150 static short localPal[0x100];
 151
 152 static void blit(const char *fps, const char *notice)
 153 {
 154         int emu_opt = currentConfig.EmuOpt;
 155
 156         if (PicoOpt&0x10)
 157         {
 158                 int lines_flags = 224;
 159                 // 8bit fast renderer
 160                 if (Pico.m.dirtyPal) {
 161                         Pico.m.dirtyPal = 0;
 162                         vidConvCpyRGB565(localPal, Pico.cram, 0x40);
 163                 }
 164                 // a hack for VR
 165                 if (PicoAHW & PAHW_SVP)
 166                         memset32((int *)(PicoDraw2FB+328*8+328*223), 0xe0e0e0e0, 328);
 167                 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
 168                 if (currentConfig.EmuOpt&0x4000)
 169                         lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
 170                 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
 171         }
 172         else if (!(emu_opt&0x80))
 173         {
 174                 int lines_flags;
 175                 // 8bit accurate renderer
 176                 if (Pico.m.dirtyPal) {
 177                         Pico.m.dirtyPal = 0;
 178                         vidConvCpyRGB565(localPal, Pico.cram, 0x40);
 179                         if (Pico.video.reg[0xC]&8) { // shadow/hilight mode
 180                                 //vidConvCpyRGB32sh(localPal+0x40, Pico.cram, 0x40);
 181                                 //vidConvCpyRGB32hi(localPal+0x80, Pico.cram, 0x40); // TODO?
 182                                 memcpy32((void *)(localPal+0xc0), (void *)(localPal+0x40), 0x40*2/4);
 183                                 localPal[0xc0] = 0x0600;
 184                                 localPal[0xd0] = 0xc000;
 185                                 localPal[0xe0] = 0x0000; // reserved pixels for OSD
 186                                 localPal[0xf0] = 0xffff;
 187                         }
 188                         /* no support
 189                         else if (rendstatus & 0x20) { // mid-frame palette changes
 190                                 vidConvCpyRGB565(localPal+0x40, HighPal, 0x40);
 191                                 vidConvCpyRGB565(localPal+0x80, HighPal+0x40, 0x40);
 192                         } */
 193                 }
 194                 lines_flags = (Pico.video.reg[1]&8) ? 240 : 224;
 195                 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
 196                 if (currentConfig.EmuOpt&0x4000)
 197                         lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
 198                 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
 199         }
 200
 201         if (notice || (emu_opt & 2)) {
 202                 int h = 232;
 203                 if (notice)      osd_text(4, h, notice);
 204                 if (emu_opt & 2) osd_text(OSD_FPS_X, h, fps);
 205         }
 206
 207         if ((emu_opt & 0x400) && (PicoAHW & PAHW_MCD))
 208                 cd_leds();
 209 }
 210
 211 // clears whole screen or just the notice area (in all buffers)
 212 static void clearArea(int full)
 213 {
 214         if (giz_screen == NULL)
 215                 giz_screen = fb_lock(1);
 216         if (full) memset32(giz_screen, 0, 320*240*2/4);
 217         else      memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
 218
 219         if (currentConfig.EmuOpt&0x8000) {
 220                 fb_unlock();
 221                 giz_screen = fb_lock(0);
 222                 if (full) memset32(giz_screen, 0, 320*240*2/4);
 223                 else      memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
 224         }
 225 }
 226
 227 static void vidResetMode(void)
 228 {
 229         giz_screen = fb_lock(1);
 230
 231         if (PicoOpt&0x10) {
 232         } else if (currentConfig.EmuOpt&0x80) {
 233                 PicoDrawSetOutFormat(PDF_RGB555, 0);
 234                 PicoDrawSetCallbacks(EmuScanBegin16, NULL);
 235         } else {
 236                 PicoDrawSetOutFormat(PDF_NONE, 0);
 237                 PicoDrawSetCallbacks(EmuScanBegin8, NULL);
 238         }
 239         if ((PicoOpt&0x10) || !(currentConfig.EmuOpt&0x80)) {
 240                 // setup pal for 8-bit modes
 241                 localPal[0xc0] = 0x0600;
 242                 localPal[0xd0] = 0xc000;
 243                 localPal[0xe0] = 0x0000; // reserved pixels for OSD
 244                 localPal[0xf0] = 0xffff;
 245         }
 246         Pico.m.dirtyPal = 1;
 247
 248         memset32(giz_screen, 0, 321*240*2/4);
 249         if (currentConfig.EmuOpt&0x8000) {
 250                 fb_unlock();
 251                 giz_screen = fb_lock(0);
 252                 memset32(giz_screen, 0, 321*240*2/4);
 253         }
 254         fb_unlock();
 255         giz_screen = NULL;
 256 }
 257
 258 /*
 259 #include <stdarg.h>
 260 static void stdbg(const char *fmt, ...)
 261 {
 262         static int cnt = 0;
 263         va_list vl;
 264
 265         sprintf(noticeMsg, "%x ", cnt++);
 266         va_start(vl, fmt);
 267         vsnprintf(noticeMsg+strlen(noticeMsg), sizeof(noticeMsg)-strlen(noticeMsg), fmt, vl);
 268         va_end(vl);
 269
 270         noticeMsgTime = GetTickCount();
 271 }
 272 */
 273
 274 static void updateSound(int len)
 275 {
 276         if (PicoOpt&8) len<<=1;
 277
 278         snd_all_samples += len;
 279         PsndOut += len;
 280         if (PsndOut - snd_cbuff >= snd_cbuf_samples)
 281         {
 282                 //if (PsndOut - snd_cbuff != snd_cbuf_samples)
 283                 //      stdbg("snd diff is %i, not %i", PsndOut - snd_cbuff, snd_cbuf_samples);
 284                 PsndOut = snd_cbuff;
 285         }
 286 }
 287
 288
 289 static void SkipFrame(void)
 290 {
 291         PicoSkipFrame=1;
 292         PicoFrame();
 293         PicoSkipFrame=0;
 294 }
 295
 296 /* forced frame to front buffer */
 297 void pemu_forced_frame(int opts, int no_scale)
 298 {
 299         int po_old = PicoOpt;
 300         int eo_old = currentConfig.EmuOpt;
 301
 302         PicoOpt &= ~0x10;
 303         PicoOpt |= opts|POPT_ACC_SPRITES;
 304         currentConfig.EmuOpt |= 0x80;
 305
 306         if (giz_screen == NULL)
 307                 giz_screen = fb_lock(1);
 308
 309         PicoDrawSetOutFormat(PDF_RGB555, 0);
 310         PicoDrawSetCallbacks(EmuScanBegin16, NULL);
 311         Pico.m.dirtyPal = 1;
 312         PicoFrameDrawOnly();
 313
 314         fb_unlock();
 315         giz_screen = NULL;
 316
 317         PicoOpt = po_old;
 318         currentConfig.EmuOpt = eo_old;
 319 }
 320
 321
 322 static void RunEvents(unsigned int which)
 323 {
 324         if (which & 0x1800) // save or load (but not both)
 325         {
 326                 int do_it = 1;
 327
 328                 if (PsndOut != NULL)
 329                         FrameworkAudio_SetPause(1);
 330                 if (giz_screen == NULL)
 331                         giz_screen = fb_lock(1);
 332                 if ( emu_check_save_file(state_slot) &&
 333                                 (( (which & 0x1000) && (currentConfig.EmuOpt & 0x800)) || // load
 334                                  (!(which & 0x1000) && (currentConfig.EmuOpt & 0x200))) ) // save
 335                 {
 336                         int keys;
 337                         blit("", (which & 0x1000) ? "LOAD STATE? (PLAY=yes, STOP=no)" : "OVERWRITE SAVE? (PLAY=yes, STOP=no)");
 338                         while( !((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) )
 339                                 Sleep(50);
 340                         if (keys & PBTN_STOP) do_it = 0;
 341                         while(  ((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) ) // wait for release
 342                                 Sleep(50);
 343                         clearArea(0);
 344                 }
 345
 346                 if (do_it)
 347                 {
 348                         osd_text(4, 232, (which & 0x1000) ? "LOADING GAME" : "SAVING GAME");
 349                         PicoStateProgressCB = emu_stateCb;
 350                         emu_save_load_game((which & 0x1000) >> 12, 0);
 351                         PicoStateProgressCB = NULL;
 352                         Sleep(0);
 353                 }
 354
 355                 if (PsndOut != NULL)
 356                         FrameworkAudio_SetPause(0);
 357                 reset_timing = 1;
 358         }
 359         if (which & 0x0400) // switch renderer
 360         {
 361                 if (PicoOpt&0x10) { PicoOpt&=~0x10; currentConfig.EmuOpt |=  0x80; }
 362                 else              { PicoOpt|= 0x10; currentConfig.EmuOpt &= ~0x80; }
 363
 364                 vidResetMode();
 365
 366                 if (PicoOpt&0x10) {
 367                         strcpy(noticeMsg, " 8bit fast renderer");
 368                 } else if (currentConfig.EmuOpt&0x80) {
 369                         strcpy(noticeMsg, "16bit accurate renderer");
 370                 } else {
 371                         strcpy(noticeMsg, " 8bit accurate renderer");
 372                 }
 373
 374                 noticeMsgTime = GetTickCount();
 375         }
 376         if (which & 0x0300)
 377         {
 378                 if(which&0x0200) {
 379                         state_slot -= 1;
 380                         if(state_slot < 0) state_slot = 9;
 381                 } else {
 382                         state_slot += 1;
 383                         if(state_slot > 9) state_slot = 0;
 384                 }
 385                 sprintf(noticeMsg, "SAVE SLOT %i [%s]", state_slot, emu_check_save_file(state_slot) ? "USED" : "FREE");
 386                 noticeMsgTime = GetTickCount();
 387         }
 388 }
 389
 390 static void updateKeys(void)
 391 {
 392         unsigned int keys, allActions[2] = { 0, 0 }, events;
 393         static unsigned int prevEvents = 0;
 394         int i;
 395
 396         /* FIXME: port to input fw, merge with emu.c:emu_update_input() */
 397         keys = Framework_PollGetButtons();
 398         if (keys & PBTN_HOME)
 399                 engineState = PGS_Menu;
 400
 401         keys &= CONFIGURABLE_KEYS;
 402
 403         PicoPad[0] = allActions[0] & 0xfff;
 404         PicoPad[1] = allActions[1] & 0xfff;
 405
 406         if (allActions[0] & 0x7000) emu_DoTurbo(&PicoPad[0], allActions[0]);
 407         if (allActions[1] & 0x7000) emu_DoTurbo(&PicoPad[1], allActions[1]);
 408
 409         events = (allActions[0] | allActions[1]) >> 16;
 410
 411         // volume is treated in special way and triggered every frame
 412         if ((events & 0x6000) && PsndOut != NULL)
 413         {
 414                 int vol = currentConfig.volume;
 415                 if (events & 0x2000) {
 416                         if (vol < 100) vol++;
 417                 } else {
 418                         if (vol >   0) vol--;
 419                 }
 420                 FrameworkAudio_SetVolume(vol, vol);
 421                 sprintf(noticeMsg, "VOL: %02i ", vol);
 422                 noticeMsgTime = GetTickCount();
 423                 currentConfig.volume = vol;
 424         }
 425
 426         events &= ~prevEvents;
 427         if (events) RunEvents(events);
 428         if (movie_data) emu_updateMovie();
 429
 430         prevEvents = (allActions[0] | allActions[1]) >> 16;
 431 }
 432
 433 void plat_debug_cat(char *str)
 434 {
 435 }
 436
 437 static void simpleWait(DWORD until)
 438 {
 439         DWORD tval;
 440         int diff;
 441
 442         tval = GetTickCount();
 443         diff = (int)until - (int)tval;
 444         if (diff >= 2)
 445                 Sleep(diff - 1);
 446
 447         while ((tval = GetTickCount()) < until && until - tval < 512) // some simple overflow detection
 448                 spend_cycles(1024*2);
 449 }
 450
 451 void pemu_loop(void)
 452 {
 453         static int PsndRate_old = 0, PicoOpt_old = 0, pal_old = 0;
 454         char fpsbuff[24]; // fps count c string
 455         DWORD tval, tval_prev = 0, tval_thissec = 0; // timing
 456         int frames_done = 0, frames_shown = 0, oldmodes = 0, sec_ms = 1000;
 457         int target_fps, target_frametime, lim_time, tval_diff, i;
 458         char *notice = NULL;
 459
 460         lprintf("entered emu_Loop()\n");
 461
 462         fpsbuff[0] = 0;
 463
 464         // make sure we are in correct mode
 465         vidResetMode();
 466         if (currentConfig.scaling) PicoOpt|=0x4000;
 467         else PicoOpt&=~0x4000;
 468         Pico.m.dirtyPal = 1;
 469         oldmodes = ((Pico.video.reg[12]&1)<<2) ^ 0xc;
 470
 471         // pal/ntsc might have changed, reset related stuff
 472         target_fps = Pico.m.pal ? 50 : 60;
 473         target_frametime = Pico.m.pal ? (1000<<8)/50 : (1000<<8)/60+1;
 474         reset_timing = 1;
 475
 476         // prepare CD buffer
 477         if (PicoAHW & PAHW_MCD) PicoCDBufferInit();
 478
 479         // prepare sound stuff
 480         PsndOut = NULL;
 481         if (currentConfig.EmuOpt & 4)
 482         {
 483                 int ret, snd_excess_add, stereo;
 484                 if (PsndRate != PsndRate_old || (PicoOpt&0x0b) != (PicoOpt_old&0x0b) || Pico.m.pal != pal_old) {
 485                         PsndRerate(Pico.m.frame_count ? 1 : 0);
 486                 }
 487                 stereo=(PicoOpt&8)>>3;
 488                 snd_excess_add = ((PsndRate - PsndLen*target_fps)<<16) / target_fps;
 489                 snd_cbuf_samples = (PsndRate<<stereo) * 16 / target_fps;
 490                 lprintf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",
 491                         PsndRate, PsndLen, snd_excess_add, stereo, Pico.m.pal);
 492                 ret = FrameworkAudio_Init(PsndRate, snd_cbuf_samples, stereo);
 493                 if (ret != 0) {
 494                         lprintf("FrameworkAudio_Init() failed: %i\n", ret);
 495                         sprintf(noticeMsg, "sound init failed (%i), snd disabled", ret);
 496                         noticeMsgTime = GetTickCount();
 497                         currentConfig.EmuOpt &= ~4;
 498                 } else {
 499                         FrameworkAudio_SetVolume(currentConfig.volume, currentConfig.volume);
 500                         PicoWriteSound = updateSound;
 501                         snd_cbuff = FrameworkAudio_56448Buffer();
 502                         PsndOut = snd_cbuff + snd_cbuf_samples / 2; // start writing at the middle
 503                         snd_all_samples = 0;
 504                         PsndRate_old = PsndRate;
 505                         PicoOpt_old  = PicoOpt;
 506                         pal_old = Pico.m.pal;
 507                 }
 508         }
 509
 510         // loop?
 511         while (engineState == PGS_Running)
 512         {
 513                 int modes;
 514
 515                 tval = GetTickCount();
 516                 if (reset_timing || tval < tval_prev) {
 517                         //stdbg("timing reset");
 518                         reset_timing = 0;
 519                         tval_thissec = tval;
 520                         frames_shown = frames_done = 0;
 521                 }
 522
 523                 // show notice message?
 524                 if (noticeMsgTime) {
 525                         static int noticeMsgSum;
 526                         if (tval - noticeMsgTime > 2000) { // > 2.0 sec
 527                                 noticeMsgTime = 0;
 528                                 clearArea(0);
 529                                 notice = 0;
 530                         } else {
 531                                 int sum = noticeMsg[0]+noticeMsg[1]+noticeMsg[2];
 532                                 if (sum != noticeMsgSum) { clearArea(0); noticeMsgSum = sum; }
 533                                 notice = noticeMsg;
 534                         }
 535                 }
 536
 537                 // check for mode changes
 538                 modes = ((Pico.video.reg[12]&1)<<2)|(Pico.video.reg[1]&8);
 539                 if (modes != oldmodes) {
 540                         oldmodes = modes;
 541                         clearArea(1);
 542                 }
 543
 544                 // second passed?
 545                 if (tval - tval_thissec >= sec_ms)
 546                 {
 547 #ifdef BENCHMARK
 548                         static int bench = 0, bench_fps = 0, bench_fps_s = 0, bfp = 0, bf[4];
 549                         if(++bench == 10) {
 550                                 bench = 0;
 551                                 bench_fps_s = bench_fps;
 552                                 bf[bfp++ & 3] = bench_fps;
 553                                 bench_fps = 0;
 554                         }
 555                         bench_fps += frames_shown;
 556                         sprintf(fpsbuff, "%02i/%02i/%02i", frames_shown, bench_fps_s, (bf[0]+bf[1]+bf[2]+bf[3])>>2);
 557 #else
 558                         if(currentConfig.EmuOpt & 2)
 559                                 sprintf(fpsbuff, "%02i/%02i", frames_shown, frames_done);
 560 #endif
 561                         //tval_thissec += 1000;
 562                         tval_thissec += sec_ms;
 563
 564                         if (PsndOut != NULL)
 565                         {
 566                                 /* some code which tries to sync things to audio clock, the dirty way */
 567                                 static int audio_skew_prev = 0;
 568                                 int audio_skew, adj, co = 9, shift = 7;
 569                                 audio_skew = snd_all_samples*2 - FrameworkAudio_BufferPos();
 570                                 if (PsndRate == 22050) co = 10;
 571                                 if (PsndRate  > 22050) co = 11;
 572                                 if (PicoOpt&8) shift++;
 573                                 if (audio_skew < 0) {
 574                                         adj = -((-audio_skew) >> shift);
 575                                         if (audio_skew > -(6<<co)) adj>>=1;
 576                                         if (audio_skew > -(4<<co)) adj>>=1;
 577                                         if (audio_skew > -(2<<co)) adj>>=1;
 578                                         if (audio_skew > audio_skew_prev) adj>>=2; // going up already
 579                                 } else {
 580                                         adj = audio_skew >> shift;
 581                                         if (audio_skew < (6<<co)) adj>>=1;
 582                                         if (audio_skew < (4<<co)) adj>>=1;
 583                                         if (audio_skew < (2<<co)) adj>>=1;
 584                                         if (audio_skew < audio_skew_prev) adj>>=2;
 585                                 }
 586                                 audio_skew_prev = audio_skew;
 587                                 target_frametime += adj;
 588                                 sec_ms = (target_frametime * target_fps) >> 8;
 589                                 //stdbg("%i %i %i", audio_skew, adj, sec_ms);
 590                                 frames_done = frames_shown = 0;
 591                         }
 592                         else if (currentConfig.Frameskip < 0) {
 593                                 frames_done  -= target_fps; if (frames_done  < 0) frames_done  = 0;
 594                                 frames_shown -= target_fps; if (frames_shown < 0) frames_shown = 0;
 595                                 if (frames_shown > frames_done) frames_shown = frames_done;
 596                         } else {
 597                                 frames_done = frames_shown = 0;
 598                         }
 599                 }
 600 #ifdef PFRAMES
 601                 sprintf(fpsbuff, "%i", Pico.m.frame_count);
 602 #endif
 603
 604                 tval_prev = tval;
 605                 lim_time = (frames_done+1) * target_frametime;
 606                 if (currentConfig.Frameskip >= 0) // frameskip enabled
 607                 {
 608                         for (i = 0; i < currentConfig.Frameskip; i++) {
 609                                 updateKeys();
 610                                 SkipFrame(); frames_done++;
 611                                 if (PsndOut) { // do framelimitting if sound is enabled
 612                                         int tval_diff;
 613                                         tval = GetTickCount();
 614                                         tval_diff = (int)(tval - tval_thissec) << 8;
 615                                         if (tval_diff < lim_time) // we are too fast
 616                                                 simpleWait(tval + ((lim_time - tval_diff)>>8));
 617                                 }
 618                                 lim_time += target_frametime;
 619                         }
 620                 }
 621                 else // auto frameskip
 622                 {
 623                         int tval_diff;
 624                         tval = GetTickCount();
 625                         tval_diff = (int)(tval - tval_thissec) << 8;
 626                         if (tval_diff > lim_time)
 627                         {
 628                                 // no time left for this frame - skip
 629                                 if (tval_diff - lim_time >= (300<<8)) {
 630                                         /* something caused a slowdown for us (disk access? cache flush?)
 631                                          * try to recover by resetting timing... */
 632                                         reset_timing = 1;
 633                                         continue;
 634                                 }
 635                                 updateKeys();
 636                                 SkipFrame(); frames_done++;
 637                                 continue;
 638                         }
 639                 }
 640
 641                 updateKeys();
 642
 643                 if (currentConfig.EmuOpt&0x80)
 644                         /* be sure correct framebuffer is locked */
 645                         giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
 646
 647                 PicoFrame();
 648
 649                 if (giz_screen == NULL)
 650                         giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
 651
 652                 blit(fpsbuff, notice);
 653
 654                 if (giz_screen != NULL) {
 655                         fb_unlock();
 656                         giz_screen = NULL;
 657                 }
 658
 659                 if (currentConfig.EmuOpt&0x2000)
 660                         Framework2D_WaitVSync();
 661
 662                 if (currentConfig.EmuOpt&0x8000)
 663                         fb_flip();
 664
 665                 // check time
 666                 tval = GetTickCount();
 667                 tval_diff = (int)(tval - tval_thissec) << 8;
 668
 669                 if (currentConfig.Frameskip < 0 && tval_diff - lim_time >= (300<<8)) // slowdown detection
 670                         reset_timing = 1;
 671                 else if (PsndOut != NULL || currentConfig.Frameskip < 0)
 672                 {
 673                         // sleep if we are still too fast
 674                         if (tval_diff < lim_time)
 675                         {
 676                                 // we are too fast
 677                                 simpleWait(tval + ((lim_time - tval_diff) >> 8));
 678                         }
 679                 }
 680
 681                 frames_done++; frames_shown++;
 682         }
 683
 684
 685         if (PicoAHW & PAHW_MCD) PicoCDBufferFree();
 686
 687         if (PsndOut != NULL) {
 688                 PsndOut = snd_cbuff = NULL;
 689                 FrameworkAudio_Close();
 690         }
 691
 692         // save SRAM
 693         if ((currentConfig.EmuOpt & 1) && SRam.changed) {
 694                 emu_stateCb("Writing SRAM/BRAM..");
 695                 emu_save_load_game(0, 1);
 696                 SRam.changed = 0;
 697         }
 698 }
 699