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
  30 static short *snd_cbuff = NULL;
  31 static int snd_cbuf_samples = 0, snd_all_samples = 0;
  32
  33
  34 static void blit(const char *fps, const char *notice);
  35 static void clearArea(int full);
  36
  37 int plat_get_root_dir(char *dst, int len)
  38 {
  39         if (len > 0) *dst = 0;
  40
  41         return 0;
  42 }
  43
  44 static void emu_msg_cb(const char *msg)
  45 {
  46         if (giz_screen != NULL) fb_unlock();
  47         giz_screen = fb_lock(1);
  48
  49         memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
  50         emu_text_out16(4, 232, msg);
  51         noticeMsgTime = GetTickCount() - 2000;
  52
  53         /* assumption: emu_msg_cb gets called only when something slow is about to happen */
  54         reset_timing = 1;
  55
  56         fb_unlock();
  57         giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
  58 }
  59
  60 void emu_stateCb(const char *str)
  61 {
  62         if (giz_screen != NULL) fb_unlock();
  63         giz_screen = fb_lock(1);
  64
  65         clearArea(0);
  66         blit("", str);
  67
  68         fb_unlock();
  69         giz_screen = NULL;
  70
  71         Sleep(0); /* yield the CPU, the system may need it */
  72 }
  73
  74 void pemu_prep_defconfig(void)
  75 {
  76         defaultConfig.s_PsndRate = 22050;
  77         defaultConfig.s_PicoCDBuffers = 0;
  78         defaultConfig.KeyBinds[ 2] = 1<<0; // SACB RLDU
  79         defaultConfig.KeyBinds[ 3] = 1<<1;
  80         defaultConfig.KeyBinds[ 0] = 1<<2;
  81         defaultConfig.KeyBinds[ 1] = 1<<3;
  82         defaultConfig.KeyBinds[ 5] = 1<<4;
  83         defaultConfig.KeyBinds[ 6] = 1<<5;
  84         defaultConfig.KeyBinds[ 7] = 1<<6;
  85         defaultConfig.KeyBinds[ 4] = 1<<7;
  86         defaultConfig.KeyBinds[13] = 1<<26; // switch rend
  87         defaultConfig.KeyBinds[ 8] = 1<<27; // save state
  88         defaultConfig.KeyBinds[ 9] = 1<<28; // load state
  89         defaultConfig.KeyBinds[12] = 1<<29; // vol up
  90         defaultConfig.KeyBinds[11] = 1<<30; // vol down
  91         defaultConfig.scaling = 0;
  92 }
  93
  94
  95 static int EmuScanBegin16(unsigned int num)
  96 {
  97         DrawLineDest = (unsigned short *) giz_screen + 321 * num;
  98
  99         if ((currentConfig.EmuOpt&0x4000) && (num&1) == 0) // (Pico.m.frame_count&1))
 100                 return 1; // skip next line
 101
 102         return 0;
 103 }
 104
 105 static int EmuScanBegin8(unsigned int num)
 106 {
 107         // draw like the fast renderer
 108         HighCol = gfx_buffer + 328 * num;
 109
 110         return 0;
 111 }
 112
 113 static void osd_text(int x, int y, const char *text)
 114 {
 115         int len = strlen(text) * 8 / 2;
 116         int *p, h;
 117         for (h = 0; h < 8; h++) {
 118                 p = (int *) ((unsigned short *) giz_screen+x+321*(y+h));
 119                 p = (int *) ((int)p & ~3); // align
 120                 memset32(p, 0, len);
 121         }
 122         emu_text_out16(x, y, text);
 123 }
 124
 125 /*
 126 void log1(void *p1, void *p2)
 127 {
 128         lprintf("%p %p %p\n", p1, p2, DrawLineDest);
 129 }
 130 */
 131
 132 static void cd_leds(void)
 133 {
 134         static int old_reg = 0;
 135         unsigned int col_g, col_r, *p;
 136
 137         if (!((Pico_mcd->s68k_regs[0] ^ old_reg) & 3)) return; // no change
 138         old_reg = Pico_mcd->s68k_regs[0];
 139
 140         p = (unsigned int *)((short *)giz_screen + 321*2+4+2);
 141         col_g = (old_reg & 2) ? 0x06000600 : 0;
 142         col_r = (old_reg & 1) ? 0xc000c000 : 0;
 143         *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r; p += 321/2 - 12/2 + 1;
 144         *p++ = col_g; p+=3; *p++ = col_r; p += 321/2 - 10/2;
 145         *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r;
 146 }
 147
 148
 149 static short localPal[0x100];
 150
 151 static void blit(const char *fps, const char *notice)
 152 {
 153         int emu_opt = currentConfig.EmuOpt;
 154
 155         if (PicoOpt&0x10)
 156         {
 157                 int lines_flags = 224;
 158                 // 8bit fast renderer
 159                 if (Pico.m.dirtyPal) {
 160                         Pico.m.dirtyPal = 0;
 161                         vidConvCpyRGB565(localPal, Pico.cram, 0x40);
 162                 }
 163                 // a hack for VR
 164                 if (PicoAHW & PAHW_SVP)
 165                         memset32((int *)(PicoDraw2FB+328*8+328*223), 0xe0e0e0e0, 328);
 166                 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
 167                 if (currentConfig.EmuOpt&0x4000)
 168                         lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
 169                 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
 170         }
 171         else if (!(emu_opt&0x80))
 172         {
 173                 int lines_flags;
 174                 // 8bit accurate renderer
 175                 if (Pico.m.dirtyPal) {
 176                         Pico.m.dirtyPal = 0;
 177                         vidConvCpyRGB565(localPal, Pico.cram, 0x40);
 178                         if (Pico.video.reg[0xC]&8) { // shadow/hilight mode
 179                                 //vidConvCpyRGB32sh(localPal+0x40, Pico.cram, 0x40);
 180                                 //vidConvCpyRGB32hi(localPal+0x80, Pico.cram, 0x40); // TODO?
 181                                 memcpy32((void *)(localPal+0xc0), (void *)(localPal+0x40), 0x40*2/4);
 182                                 localPal[0xc0] = 0x0600;
 183                                 localPal[0xd0] = 0xc000;
 184                                 localPal[0xe0] = 0x0000; // reserved pixels for OSD
 185                                 localPal[0xf0] = 0xffff;
 186                         }
 187                         /* no support
 188                         else if (rendstatus & 0x20) { // mid-frame palette changes
 189                                 vidConvCpyRGB565(localPal+0x40, HighPal, 0x40);
 190                                 vidConvCpyRGB565(localPal+0x80, HighPal+0x40, 0x40);
 191                         } */
 192                 }
 193                 lines_flags = (Pico.video.reg[1]&8) ? 240 : 224;
 194                 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
 195                 if (currentConfig.EmuOpt&0x4000)
 196                         lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
 197                 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
 198         }
 199
 200         if (notice || (emu_opt & 2)) {
 201                 int h = 232;
 202                 if (notice)      osd_text(4, h, notice);
 203                 if (emu_opt & 2) osd_text(OSD_FPS_X, h, fps);
 204         }
 205
 206         if ((emu_opt & 0x400) && (PicoAHW & PAHW_MCD))
 207                 cd_leds();
 208 }
 209
 210 // clears whole screen or just the notice area (in all buffers)
 211 static void clearArea(int full)
 212 {
 213         if (giz_screen == NULL)
 214                 giz_screen = fb_lock(1);
 215         if (full) memset32(giz_screen, 0, 320*240*2/4);
 216         else      memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
 217
 218         if (currentConfig.EmuOpt&0x8000) {
 219                 fb_unlock();
 220                 giz_screen = fb_lock(0);
 221                 if (full) memset32(giz_screen, 0, 320*240*2/4);
 222                 else      memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
 223         }
 224 }
 225
 226 static void vidResetMode(void)
 227 {
 228         giz_screen = fb_lock(1);
 229
 230         if (PicoOpt&0x10) {
 231         } else if (currentConfig.EmuOpt&0x80) {
 232                 PicoDrawSetOutFormat(PDF_RGB555, 0);
 233                 PicoDrawSetCallbacks(EmuScanBegin16, NULL);
 234         } else {
 235                 PicoDrawSetOutFormat(PDF_NONE, 0);
 236                 PicoDrawSetCallbacks(EmuScanBegin8, NULL);
 237         }
 238         if ((PicoOpt&0x10) || !(currentConfig.EmuOpt&0x80)) {
 239                 // setup pal for 8-bit modes
 240                 localPal[0xc0] = 0x0600;
 241                 localPal[0xd0] = 0xc000;
 242                 localPal[0xe0] = 0x0000; // reserved pixels for OSD
 243                 localPal[0xf0] = 0xffff;
 244         }
 245         Pico.m.dirtyPal = 1;
 246
 247         memset32(giz_screen, 0, 321*240*2/4);
 248         if (currentConfig.EmuOpt&0x8000) {
 249                 fb_unlock();
 250                 giz_screen = fb_lock(0);
 251                 memset32(giz_screen, 0, 321*240*2/4);
 252         }
 253         fb_unlock();
 254         giz_screen = NULL;
 255 }
 256
 257 /*
 258 #include <stdarg.h>
 259 static void stdbg(const char *fmt, ...)
 260 {
 261         static int cnt = 0;
 262         va_list vl;
 263
 264         sprintf(noticeMsg, "%x ", cnt++);
 265         va_start(vl, fmt);
 266         vsnprintf(noticeMsg+strlen(noticeMsg), sizeof(noticeMsg)-strlen(noticeMsg), fmt, vl);
 267         va_end(vl);
 268
 269         noticeMsgTime = GetTickCount();
 270 }
 271 */
 272
 273 static void updateSound(int len)
 274 {
 275         snd_all_samples += len / 2;
 276         PsndOut += len / 2;
 277         if (PsndOut - snd_cbuff >= snd_cbuf_samples)
 278         {
 279                 //if (PsndOut - snd_cbuff != snd_cbuf_samples)
 280                 //      stdbg("snd diff is %i, not %i", PsndOut - snd_cbuff, snd_cbuf_samples);
 281                 PsndOut = snd_cbuff;
 282         }
 283 }
 284
 285
 286 static void SkipFrame(void)
 287 {
 288         PicoSkipFrame=1;
 289         PicoFrame();
 290         PicoSkipFrame=0;
 291 }
 292
 293 /* forced frame to front buffer */
 294 void pemu_forced_frame(int no_scale, int do_emu)
 295 {
 296         int po_old = PicoOpt;
 297         int eo_old = currentConfig.EmuOpt;
 298
 299         PicoOpt &= ~0x10;
 300         PicoOpt |= POPT_ACC_SPRITES;
 301         if (!no_scale)
 302                 PicoOpt |= POPT_EN_SOFTSCALE;
 303         currentConfig.EmuOpt |= 0x80;
 304
 305         if (giz_screen == NULL)
 306                 giz_screen = fb_lock(1);
 307
 308         PicoDrawSetOutFormat(PDF_RGB555, 0);
 309         PicoDrawSetCallbacks(EmuScanBegin16, NULL);
 310         Pico.m.dirtyPal = 1;
 311         PicoFrameDrawOnly();
 312
 313         fb_unlock();
 314         giz_screen = NULL;
 315
 316         PicoOpt = po_old;
 317         currentConfig.EmuOpt = eo_old;
 318 }
 319
 320
 321 static void RunEvents(unsigned int which)
 322 {
 323         if (which & 0x1800) // save or load (but not both)
 324         {
 325                 int do_it = 1;
 326
 327                 if (PsndOut != NULL)
 328                         FrameworkAudio_SetPause(1);
 329                 if (giz_screen == NULL)
 330                         giz_screen = fb_lock(1);
 331                 if ( emu_check_save_file(state_slot) &&
 332                                 (( (which & 0x1000) && (currentConfig.EmuOpt & 0x800)) || // load
 333                                  (!(which & 0x1000) && (currentConfig.EmuOpt & 0x200))) ) // save
 334                 {
 335                         int keys;
 336                         blit("", (which & 0x1000) ? "LOAD STATE? (PLAY=yes, STOP=no)" : "OVERWRITE SAVE? (PLAY=yes, STOP=no)");
 337                         while( !((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) )
 338                                 Sleep(50);
 339                         if (keys & PBTN_STOP) do_it = 0;
 340                         while(  ((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) ) // wait for release
 341                                 Sleep(50);
 342                         clearArea(0);
 343                 }
 344
 345                 if (do_it)
 346                 {
 347                         osd_text(4, 232, (which & 0x1000) ? "LOADING GAME" : "SAVING GAME");
 348                         PicoStateProgressCB = emu_stateCb;
 349                         emu_save_load_game((which & 0x1000) >> 12, 0);
 350                         PicoStateProgressCB = NULL;
 351                         Sleep(0);
 352                 }
 353
 354                 if (PsndOut != NULL)
 355                         FrameworkAudio_SetPause(0);
 356                 reset_timing = 1;
 357         }
 358         if (which & 0x0400) // switch renderer
 359         {
 360                 if (PicoOpt&0x10) { PicoOpt&=~0x10; currentConfig.EmuOpt |=  0x80; }
 361                 else              { PicoOpt|= 0x10; currentConfig.EmuOpt &= ~0x80; }
 362
 363                 vidResetMode();
 364
 365                 if (PicoOpt&0x10) {
 366                         strcpy(noticeMsg, " 8bit fast renderer");
 367                 } else if (currentConfig.EmuOpt&0x80) {
 368                         strcpy(noticeMsg, "16bit accurate renderer");
 369                 } else {
 370                         strcpy(noticeMsg, " 8bit accurate renderer");
 371                 }
 372
 373                 noticeMsgTime = GetTickCount();
 374         }
 375         if (which & 0x0300)
 376         {
 377                 if(which&0x0200) {
 378                         state_slot -= 1;
 379                         if(state_slot < 0) state_slot = 9;
 380                 } else {
 381                         state_slot += 1;
 382                         if(state_slot > 9) state_slot = 0;
 383                 }
 384                 sprintf(noticeMsg, "SAVE SLOT %i [%s]", state_slot, emu_check_save_file(state_slot) ? "USED" : "FREE");
 385                 noticeMsgTime = GetTickCount();
 386         }
 387 }
 388
 389 static void updateKeys(void)
 390 {
 391         unsigned int keys, allActions[2] = { 0, 0 }, events;
 392         static unsigned int prevEvents = 0;
 393         int i;
 394
 395         /* FIXME: port to input fw, merge with emu.c:emu_update_input() */
 396         keys = Framework_PollGetButtons();
 397         if (keys & PBTN_HOME)
 398                 engineState = PGS_Menu;
 399
 400         keys &= CONFIGURABLE_KEYS;
 401
 402         PicoPad[0] = allActions[0] & 0xfff;
 403         PicoPad[1] = allActions[1] & 0xfff;
 404
 405         if (allActions[0] & 0x7000) emu_DoTurbo(&PicoPad[0], allActions[0]);
 406         if (allActions[1] & 0x7000) emu_DoTurbo(&PicoPad[1], allActions[1]);
 407
 408         events = (allActions[0] | allActions[1]) >> 16;
 409
 410         // volume is treated in special way and triggered every frame
 411         if ((events & 0x6000) && PsndOut != NULL)
 412         {
 413                 int vol = currentConfig.volume;
 414                 if (events & 0x2000) {
 415                         if (vol < 100) vol++;
 416                 } else {
 417                         if (vol >   0) vol--;
 418                 }
 419                 FrameworkAudio_SetVolume(vol, vol);
 420                 sprintf(noticeMsg, "VOL: %02i ", vol);
 421                 noticeMsgTime = GetTickCount();
 422                 currentConfig.volume = vol;
 423         }
 424
 425         events &= ~prevEvents;
 426         if (events) RunEvents(events);
 427         if (movie_data) emu_updateMovie();
 428
 429         prevEvents = (allActions[0] | allActions[1]) >> 16;
 430 }
 431
 432 void plat_debug_cat(char *str)
 433 {
 434 }
 435
 436 static void simpleWait(DWORD until)
 437 {
 438         DWORD tval;
 439         int diff;
 440
 441         tval = GetTickCount();
 442         diff = (int)until - (int)tval;
 443         if (diff >= 2)
 444                 Sleep(diff - 1);
 445
 446         while ((tval = GetTickCount()) < until && until - tval < 512) // some simple overflow detection
 447                 spend_cycles(1024*2);
 448 }
 449
 450 void pemu_loop(void)
 451 {
 452         static int PsndRate_old = 0, PicoOpt_old = 0, pal_old = 0;
 453         char fpsbuff[24]; // fps count c string
 454         DWORD tval, tval_prev = 0, tval_thissec = 0; // timing
 455         int frames_done = 0, frames_shown = 0, oldmodes = 0, sec_ms = 1000;
 456         int target_fps, target_frametime, lim_time, tval_diff, i;
 457         char *notice = NULL;
 458
 459         lprintf("entered emu_Loop()\n");
 460
 461         fpsbuff[0] = 0;
 462
 463         // make sure we are in correct mode
 464         vidResetMode();
 465         if (currentConfig.scaling) PicoOpt|=0x4000;
 466         else PicoOpt&=~0x4000;
 467         Pico.m.dirtyPal = 1;
 468         oldmodes = ((Pico.video.reg[12]&1)<<2) ^ 0xc;
 469
 470         // pal/ntsc might have changed, reset related stuff
 471         target_fps = Pico.m.pal ? 50 : 60;
 472         target_frametime = Pico.m.pal ? (1000<<8)/50 : (1000<<8)/60+1;
 473         reset_timing = 1;
 474
 475         // prepare CD buffer
 476         if (PicoAHW & PAHW_MCD) PicoCDBufferInit();
 477
 478         // prepare sound stuff
 479         PsndOut = NULL;
 480         if (currentConfig.EmuOpt & 4)
 481         {
 482                 int ret, snd_excess_add, stereo;
 483                 if (PsndRate != PsndRate_old || (PicoOpt&0x0b) != (PicoOpt_old&0x0b) || Pico.m.pal != pal_old) {
 484                         PsndRerate(Pico.m.frame_count ? 1 : 0);
 485                 }
 486                 stereo=(PicoOpt&8)>>3;
 487                 snd_excess_add = ((PsndRate - PsndLen*target_fps)<<16) / target_fps;
 488                 snd_cbuf_samples = (PsndRate<<stereo) * 16 / target_fps;
 489                 lprintf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",
 490                         PsndRate, PsndLen, snd_excess_add, stereo, Pico.m.pal);
 491                 ret = FrameworkAudio_Init(PsndRate, snd_cbuf_samples, stereo);
 492                 if (ret != 0) {
 493                         lprintf("FrameworkAudio_Init() failed: %i\n", ret);
 494                         sprintf(noticeMsg, "sound init failed (%i), snd disabled", ret);
 495                         noticeMsgTime = GetTickCount();
 496                         currentConfig.EmuOpt &= ~4;
 497                 } else {
 498                         FrameworkAudio_SetVolume(currentConfig.volume, currentConfig.volume);
 499                         PicoWriteSound = updateSound;
 500                         snd_cbuff = FrameworkAudio_56448Buffer();
 501                         PsndOut = snd_cbuff + snd_cbuf_samples / 2; // start writing at the middle
 502                         snd_all_samples = 0;
 503                         PsndRate_old = PsndRate;
 504                         PicoOpt_old  = PicoOpt;
 505                         pal_old = Pico.m.pal;
 506                 }
 507         }
 508
 509         // loop?
 510         while (engineState == PGS_Running)
 511         {
 512                 int modes;
 513
 514                 tval = GetTickCount();
 515                 if (reset_timing || tval < tval_prev) {
 516                         //stdbg("timing reset");
 517                         reset_timing = 0;
 518                         tval_thissec = tval;
 519                         frames_shown = frames_done = 0;
 520                 }
 521
 522                 // show notice message?
 523                 if (noticeMsgTime) {
 524                         static int noticeMsgSum;
 525                         if (tval - noticeMsgTime > 2000) { // > 2.0 sec
 526                                 noticeMsgTime = 0;
 527                                 clearArea(0);
 528                                 notice = 0;
 529                         } else {
 530                                 int sum = noticeMsg[0]+noticeMsg[1]+noticeMsg[2];
 531                                 if (sum != noticeMsgSum) { clearArea(0); noticeMsgSum = sum; }
 532                                 notice = noticeMsg;
 533                         }
 534                 }
 535
 536                 // check for mode changes
 537                 modes = ((Pico.video.reg[12]&1)<<2)|(Pico.video.reg[1]&8);
 538                 if (modes != oldmodes) {
 539                         oldmodes = modes;
 540                         clearArea(1);
 541                 }
 542
 543                 // second passed?
 544                 if (tval - tval_thissec >= sec_ms)
 545                 {
 546 #ifdef BENCHMARK
 547                         static int bench = 0, bench_fps = 0, bench_fps_s = 0, bfp = 0, bf[4];
 548                         if(++bench == 10) {
 549                                 bench = 0;
 550                                 bench_fps_s = bench_fps;
 551                                 bf[bfp++ & 3] = bench_fps;
 552                                 bench_fps = 0;
 553                         }
 554                         bench_fps += frames_shown;
 555                         sprintf(fpsbuff, "%02i/%02i/%02i", frames_shown, bench_fps_s, (bf[0]+bf[1]+bf[2]+bf[3])>>2);
 556 #else
 557                         if(currentConfig.EmuOpt & 2)
 558                                 sprintf(fpsbuff, "%02i/%02i", frames_shown, frames_done);
 559 #endif
 560                         //tval_thissec += 1000;
 561                         tval_thissec += sec_ms;
 562
 563                         if (PsndOut != NULL)
 564                         {
 565                                 /* some code which tries to sync things to audio clock, the dirty way */
 566                                 static int audio_skew_prev = 0;
 567                                 int audio_skew, adj, co = 9, shift = 7;
 568                                 audio_skew = snd_all_samples*2 - FrameworkAudio_BufferPos();
 569                                 if (PsndRate == 22050) co = 10;
 570                                 if (PsndRate  > 22050) co = 11;
 571                                 if (PicoOpt&8) shift++;
 572                                 if (audio_skew < 0) {
 573                                         adj = -((-audio_skew) >> shift);
 574                                         if (audio_skew > -(6<<co)) adj>>=1;
 575                                         if (audio_skew > -(4<<co)) adj>>=1;
 576                                         if (audio_skew > -(2<<co)) adj>>=1;
 577                                         if (audio_skew > audio_skew_prev) adj>>=2; // going up already
 578                                 } else {
 579                                         adj = audio_skew >> shift;
 580                                         if (audio_skew < (6<<co)) adj>>=1;
 581                                         if (audio_skew < (4<<co)) adj>>=1;
 582                                         if (audio_skew < (2<<co)) adj>>=1;
 583                                         if (audio_skew < audio_skew_prev) adj>>=2;
 584                                 }
 585                                 audio_skew_prev = audio_skew;
 586                                 target_frametime += adj;
 587                                 sec_ms = (target_frametime * target_fps) >> 8;
 588                                 //stdbg("%i %i %i", audio_skew, adj, sec_ms);
 589                                 frames_done = frames_shown = 0;
 590                         }
 591                         else if (currentConfig.Frameskip < 0) {
 592                                 frames_done  -= target_fps; if (frames_done  < 0) frames_done  = 0;
 593                                 frames_shown -= target_fps; if (frames_shown < 0) frames_shown = 0;
 594                                 if (frames_shown > frames_done) frames_shown = frames_done;
 595                         } else {
 596                                 frames_done = frames_shown = 0;
 597                         }
 598                 }
 599 #ifdef PFRAMES
 600                 sprintf(fpsbuff, "%i", Pico.m.frame_count);
 601 #endif
 602
 603                 tval_prev = tval;
 604                 lim_time = (frames_done+1) * target_frametime;
 605                 if (currentConfig.Frameskip >= 0) // frameskip enabled
 606                 {
 607                         for (i = 0; i < currentConfig.Frameskip; i++) {
 608                                 updateKeys();
 609                                 SkipFrame(); frames_done++;
 610                                 if (PsndOut) { // do framelimitting if sound is enabled
 611                                         int tval_diff;
 612                                         tval = GetTickCount();
 613                                         tval_diff = (int)(tval - tval_thissec) << 8;
 614                                         if (tval_diff < lim_time) // we are too fast
 615                                                 simpleWait(tval + ((lim_time - tval_diff)>>8));
 616                                 }
 617                                 lim_time += target_frametime;
 618                         }
 619                 }
 620                 else // auto frameskip
 621                 {
 622                         int tval_diff;
 623                         tval = GetTickCount();
 624                         tval_diff = (int)(tval - tval_thissec) << 8;
 625                         if (tval_diff > lim_time)
 626                         {
 627                                 // no time left for this frame - skip
 628                                 if (tval_diff - lim_time >= (300<<8)) {
 629                                         /* something caused a slowdown for us (disk access? cache flush?)
 630                                          * try to recover by resetting timing... */
 631                                         reset_timing = 1;
 632                                         continue;
 633                                 }
 634                                 updateKeys();
 635                                 SkipFrame(); frames_done++;
 636                                 continue;
 637                         }
 638                 }
 639
 640                 updateKeys();
 641
 642                 if (currentConfig.EmuOpt&0x80)
 643                         /* be sure correct framebuffer is locked */
 644                         giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
 645
 646                 PicoFrame();
 647
 648                 if (giz_screen == NULL)
 649                         giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
 650
 651                 blit(fpsbuff, notice);
 652
 653                 if (giz_screen != NULL) {
 654                         fb_unlock();
 655                         giz_screen = NULL;
 656                 }
 657
 658                 if (currentConfig.EmuOpt&0x2000)
 659                         Framework2D_WaitVSync();
 660
 661                 if (currentConfig.EmuOpt&0x8000)
 662                         fb_flip();
 663
 664                 // check time
 665                 tval = GetTickCount();
 666                 tval_diff = (int)(tval - tval_thissec) << 8;
 667
 668                 if (currentConfig.Frameskip < 0 && tval_diff - lim_time >= (300<<8)) // slowdown detection
 669                         reset_timing = 1;
 670                 else if (PsndOut != NULL || currentConfig.Frameskip < 0)
 671                 {
 672                         // sleep if we are still too fast
 673                         if (tval_diff < lim_time)
 674                         {
 675                                 // we are too fast
 676                                 simpleWait(tval + ((lim_time - tval_diff) >> 8));
 677                         }
 678                 }
 679
 680                 frames_done++; frames_shown++;
 681         }
 682
 683
 684         if (PicoAHW & PAHW_MCD) PicoCDBufferFree();
 685
 686         if (PsndOut != NULL) {
 687                 PsndOut = snd_cbuff = NULL;
 688                 FrameworkAudio_Close();
 689         }
 690
 691         // save SRAM
 692         if ((currentConfig.EmuOpt & 1) && SRam.changed) {
 693                 emu_stateCb("Writing SRAM/BRAM..");
 694                 emu_save_load_game(0, 1);
 695                 SRam.changed = 0;
 696         }
 697 }
 698