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         Pico.est.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         Pico.est.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 static void cd_leds(void)
 126 {
 127         static int old_reg = 0;
 128         unsigned int col_g, col_r, *p;
 129
 130         if (!((Pico_mcd->s68k_regs[0] ^ old_reg) & 3)) return; // no change
 131         old_reg = Pico_mcd->s68k_regs[0];
 132
 133         p = (unsigned int *)((short *)giz_screen + 321*2+4+2);
 134         col_g = (old_reg & 2) ? 0x06000600 : 0;
 135         col_r = (old_reg & 1) ? 0xc000c000 : 0;
 136         *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r; p += 321/2 - 12/2 + 1;
 137         *p++ = col_g; p+=3; *p++ = col_r; p += 321/2 - 10/2;
 138         *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r;
 139 }
 140
 141
 142 static short localPal[0x100];
 143
 144 static void blit(const char *fps, const char *notice)
 145 {
 146         int emu_opt = currentConfig.EmuOpt;
 147
 148         if (PicoOpt&0x10)
 149         {
 150                 int lines_flags = 224;
 151                 // 8bit fast renderer
 152                 if (Pico.m.dirtyPal) {
 153                         Pico.m.dirtyPal = 0;
 154                         vidConvCpyRGB565(localPal, Pico.cram, 0x40);
 155                 }
 156                 // a hack for VR
 157                 if (PicoAHW & PAHW_SVP)
 158                         memset32((int *)(Pico.est.Draw2FB+328*8+328*223), 0xe0e0e0e0, 328);
 159                 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
 160                 if (currentConfig.EmuOpt&0x4000)
 161                         lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
 162                 vidCpy8to16((unsigned short *)giz_screen+321*8, Pico.est.Draw2FB+328*8, localPal, lines_flags);
 163         }
 164         else if (!(emu_opt&0x80))
 165         {
 166                 int lines_flags;
 167                 // 8bit accurate renderer
 168                 if (Pico.m.dirtyPal) {
 169                         Pico.m.dirtyPal = 0;
 170                         vidConvCpyRGB565(localPal, Pico.cram, 0x40);
 171                         if (Pico.video.reg[0xC]&8) { // shadow/hilight mode
 172                                 //vidConvCpyRGB32sh(localPal+0x40, Pico.cram, 0x40);
 173                                 //vidConvCpyRGB32hi(localPal+0x80, Pico.cram, 0x40); // TODO?
 174                                 memcpy32((void *)(localPal+0xc0), (void *)(localPal+0x40), 0x40*2/4);
 175                                 localPal[0xc0] = 0x0600;
 176                                 localPal[0xd0] = 0xc000;
 177                                 localPal[0xe0] = 0x0000; // reserved pixels for OSD
 178                                 localPal[0xf0] = 0xffff;
 179                         }
 180                         /* no support
 181                         else if (rendstatus & 0x20) { // mid-frame palette changes
 182                                 vidConvCpyRGB565(localPal+0x40, HighPal, 0x40);
 183                                 vidConvCpyRGB565(localPal+0x80, HighPal+0x40, 0x40);
 184                         } */
 185                 }
 186                 lines_flags = (Pico.video.reg[1]&8) ? 240 : 224;
 187                 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
 188                 if (currentConfig.EmuOpt&0x4000)
 189                         lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
 190                 vidCpy8to16((unsigned short *)giz_screen+321*8, Pico.est.Draw2FB+328*8, localPal, lines_flags);
 191         }
 192
 193         if (notice || (emu_opt & 2)) {
 194                 int h = 232;
 195                 if (notice)      osd_text(4, h, notice);
 196                 if (emu_opt & 2) osd_text(OSD_FPS_X, h, fps);
 197         }
 198
 199         if ((emu_opt & 0x400) && (PicoAHW & PAHW_MCD))
 200                 cd_leds();
 201 }
 202
 203 // clears whole screen or just the notice area (in all buffers)
 204 static void clearArea(int full)
 205 {
 206         if (giz_screen == NULL)
 207                 giz_screen = fb_lock(1);
 208         if (full) memset32(giz_screen, 0, 320*240*2/4);
 209         else      memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
 210
 211         if (currentConfig.EmuOpt&0x8000) {
 212                 fb_unlock();
 213                 giz_screen = fb_lock(0);
 214                 if (full) memset32(giz_screen, 0, 320*240*2/4);
 215                 else      memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
 216         }
 217 }
 218
 219 static void vidResetMode(void)
 220 {
 221         giz_screen = fb_lock(1);
 222
 223         if (PicoOpt&0x10) {
 224         } else if (currentConfig.EmuOpt&0x80) {
 225                 PicoDrawSetOutFormat(PDF_RGB555, 0);
 226                 PicoDrawSetCallbacks(EmuScanBegin16, NULL);
 227         } else {
 228                 PicoDrawSetOutFormat(PDF_NONE, 0);
 229                 PicoDrawSetCallbacks(EmuScanBegin8, NULL);
 230         }
 231         if ((PicoOpt&0x10) || !(currentConfig.EmuOpt&0x80)) {
 232                 // setup pal for 8-bit modes
 233                 localPal[0xc0] = 0x0600;
 234                 localPal[0xd0] = 0xc000;
 235                 localPal[0xe0] = 0x0000; // reserved pixels for OSD
 236                 localPal[0xf0] = 0xffff;
 237         }
 238         Pico.m.dirtyPal = 1;
 239
 240         memset32(giz_screen, 0, 321*240*2/4);
 241         if (currentConfig.EmuOpt&0x8000) {
 242                 fb_unlock();
 243                 giz_screen = fb_lock(0);
 244                 memset32(giz_screen, 0, 321*240*2/4);
 245         }
 246         fb_unlock();
 247         giz_screen = NULL;
 248 }
 249
 250 /*
 251 #include <stdarg.h>
 252 static void stdbg(const char *fmt, ...)
 253 {
 254         static int cnt = 0;
 255         va_list vl;
 256
 257         sprintf(noticeMsg, "%x ", cnt++);
 258         va_start(vl, fmt);
 259         vsnprintf(noticeMsg+strlen(noticeMsg), sizeof(noticeMsg)-strlen(noticeMsg), fmt, vl);
 260         va_end(vl);
 261
 262         noticeMsgTime = GetTickCount();
 263 }
 264 */
 265
 266 static void updateSound(int len)
 267 {
 268         snd_all_samples += len / 2;
 269         PsndOut += len / 2;
 270         if (PsndOut - snd_cbuff >= snd_cbuf_samples)
 271         {
 272                 //if (PsndOut - snd_cbuff != snd_cbuf_samples)
 273                 //      stdbg("snd diff is %i, not %i", PsndOut - snd_cbuff, snd_cbuf_samples);
 274                 PsndOut = snd_cbuff;
 275         }
 276 }
 277
 278
 279 static void SkipFrame(void)
 280 {
 281         PicoSkipFrame=1;
 282         PicoFrame();
 283         PicoSkipFrame=0;
 284 }
 285
 286 /* forced frame to front buffer */
 287 void pemu_forced_frame(int no_scale, int do_emu)
 288 {
 289         int po_old = PicoOpt;
 290         int eo_old = currentConfig.EmuOpt;
 291
 292         PicoOpt &= ~0x10;
 293         PicoOpt |= POPT_ACC_SPRITES;
 294         if (!no_scale)
 295                 PicoOpt |= POPT_EN_SOFTSCALE;
 296         currentConfig.EmuOpt |= 0x80;
 297
 298         if (giz_screen == NULL)
 299                 giz_screen = fb_lock(1);
 300
 301         PicoDrawSetOutFormat(PDF_RGB555, 0);
 302         PicoDrawSetCallbacks(EmuScanBegin16, NULL);
 303         Pico.m.dirtyPal = 1;
 304         PicoFrameDrawOnly();
 305
 306         fb_unlock();
 307         giz_screen = NULL;
 308
 309         PicoOpt = po_old;
 310         currentConfig.EmuOpt = eo_old;
 311 }
 312
 313
 314 static void RunEvents(unsigned int which)
 315 {
 316         if (which & 0x1800) // save or load (but not both)
 317         {
 318                 int do_it = 1;
 319
 320                 if (PsndOut != NULL)
 321                         FrameworkAudio_SetPause(1);
 322                 if (giz_screen == NULL)
 323                         giz_screen = fb_lock(1);
 324                 if ( emu_check_save_file(state_slot) &&
 325                                 (( (which & 0x1000) && (currentConfig.EmuOpt & 0x800)) || // load
 326                                  (!(which & 0x1000) && (currentConfig.EmuOpt & 0x200))) ) // save
 327                 {
 328                         int keys;
 329                         blit("", (which & 0x1000) ? "LOAD STATE? (PLAY=yes, STOP=no)" : "OVERWRITE SAVE? (PLAY=yes, STOP=no)");
 330                         while( !((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) )
 331                                 Sleep(50);
 332                         if (keys & PBTN_STOP) do_it = 0;
 333                         while(  ((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) ) // wait for release
 334                                 Sleep(50);
 335                         clearArea(0);
 336                 }
 337
 338                 if (do_it)
 339                 {
 340                         osd_text(4, 232, (which & 0x1000) ? "LOADING GAME" : "SAVING GAME");
 341                         PicoStateProgressCB = emu_stateCb;
 342                         emu_save_load_game((which & 0x1000) >> 12, 0);
 343                         PicoStateProgressCB = NULL;
 344                         Sleep(0);
 345                 }
 346
 347                 if (PsndOut != NULL)
 348                         FrameworkAudio_SetPause(0);
 349                 reset_timing = 1;
 350         }
 351         if (which & 0x0400) // switch renderer
 352         {
 353                 if (PicoOpt&0x10) { PicoOpt&=~0x10; currentConfig.EmuOpt |=  0x80; }
 354                 else              { PicoOpt|= 0x10; currentConfig.EmuOpt &= ~0x80; }
 355
 356                 vidResetMode();
 357
 358                 if (PicoOpt&0x10) {
 359                         strcpy(noticeMsg, " 8bit fast renderer");
 360                 } else if (currentConfig.EmuOpt&0x80) {
 361                         strcpy(noticeMsg, "16bit accurate renderer");
 362                 } else {
 363                         strcpy(noticeMsg, " 8bit accurate renderer");
 364                 }
 365
 366                 noticeMsgTime = GetTickCount();
 367         }
 368         if (which & 0x0300)
 369         {
 370                 if(which&0x0200) {
 371                         state_slot -= 1;
 372                         if(state_slot < 0) state_slot = 9;
 373                 } else {
 374                         state_slot += 1;
 375                         if(state_slot > 9) state_slot = 0;
 376                 }
 377                 sprintf(noticeMsg, "SAVE SLOT %i [%s]", state_slot, emu_check_save_file(state_slot) ? "USED" : "FREE");
 378                 noticeMsgTime = GetTickCount();
 379         }
 380 }
 381
 382 static void updateKeys(void)
 383 {
 384         unsigned int keys, allActions[2] = { 0, 0 }, events;
 385         static unsigned int prevEvents = 0;
 386         int i;
 387
 388         /* FIXME: port to input fw, merge with emu.c:emu_update_input() */
 389         keys = Framework_PollGetButtons();
 390         if (keys & PBTN_HOME)
 391                 engineState = PGS_Menu;
 392
 393         keys &= CONFIGURABLE_KEYS;
 394
 395         PicoPad[0] = allActions[0] & 0xfff;
 396         PicoPad[1] = allActions[1] & 0xfff;
 397
 398         if (allActions[0] & 0x7000) emu_DoTurbo(&PicoPad[0], allActions[0]);
 399         if (allActions[1] & 0x7000) emu_DoTurbo(&PicoPad[1], allActions[1]);
 400
 401         events = (allActions[0] | allActions[1]) >> 16;
 402
 403         // volume is treated in special way and triggered every frame
 404         if ((events & 0x6000) && PsndOut != NULL)
 405         {
 406                 int vol = currentConfig.volume;
 407                 if (events & 0x2000) {
 408                         if (vol < 100) vol++;
 409                 } else {
 410                         if (vol >   0) vol--;
 411                 }
 412                 FrameworkAudio_SetVolume(vol, vol);
 413                 sprintf(noticeMsg, "VOL: %02i ", vol);
 414                 noticeMsgTime = GetTickCount();
 415                 currentConfig.volume = vol;
 416         }
 417
 418         events &= ~prevEvents;
 419         if (events) RunEvents(events);
 420         if (movie_data) emu_updateMovie();
 421
 422         prevEvents = (allActions[0] | allActions[1]) >> 16;
 423 }
 424
 425 void plat_debug_cat(char *str)
 426 {
 427 }
 428
 429 static void simpleWait(DWORD until)
 430 {
 431         DWORD tval;
 432         int diff;
 433
 434         tval = GetTickCount();
 435         diff = (int)until - (int)tval;
 436         if (diff >= 2)
 437                 Sleep(diff - 1);
 438
 439         while ((tval = GetTickCount()) < until && until - tval < 512) // some simple overflow detection
 440                 spend_cycles(1024*2);
 441 }
 442
 443 void pemu_loop(void)
 444 {
 445         static int PsndRate_old = 0, PicoOpt_old = 0, pal_old = 0;
 446         char fpsbuff[24]; // fps count c string
 447         DWORD tval, tval_prev = 0, tval_thissec = 0; // timing
 448         int frames_done = 0, frames_shown = 0, oldmodes = 0, sec_ms = 1000;
 449         int target_fps, target_frametime, lim_time, tval_diff, i;
 450         char *notice = NULL;
 451
 452         lprintf("entered emu_Loop()\n");
 453
 454         fpsbuff[0] = 0;
 455
 456         // make sure we are in correct mode
 457         vidResetMode();
 458         if (currentConfig.scaling) PicoOpt|=0x4000;
 459         else PicoOpt&=~0x4000;
 460         Pico.m.dirtyPal = 1;
 461         oldmodes = ((Pico.video.reg[12]&1)<<2) ^ 0xc;
 462
 463         // pal/ntsc might have changed, reset related stuff
 464         target_fps = Pico.m.pal ? 50 : 60;
 465         target_frametime = Pico.m.pal ? (1000<<8)/50 : (1000<<8)/60+1;
 466         reset_timing = 1;
 467
 468         // prepare CD buffer
 469         if (PicoAHW & PAHW_MCD) PicoCDBufferInit();
 470
 471         // prepare sound stuff
 472         PsndOut = NULL;
 473         if (currentConfig.EmuOpt & 4)
 474         {
 475                 int ret, snd_excess_add, stereo;
 476                 if (PsndRate != PsndRate_old || (PicoOpt&0x0b) != (PicoOpt_old&0x0b) || Pico.m.pal != pal_old) {
 477                         PsndRerate(Pico.m.frame_count ? 1 : 0);
 478                 }
 479                 stereo=(PicoOpt&8)>>3;
 480                 snd_excess_add = ((PsndRate - PsndLen*target_fps)<<16) / target_fps;
 481                 snd_cbuf_samples = (PsndRate<<stereo) * 16 / target_fps;
 482                 lprintf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",
 483                         PsndRate, PsndLen, snd_excess_add, stereo, Pico.m.pal);
 484                 ret = FrameworkAudio_Init(PsndRate, snd_cbuf_samples, stereo);
 485                 if (ret != 0) {
 486                         lprintf("FrameworkAudio_Init() failed: %i\n", ret);
 487                         sprintf(noticeMsg, "sound init failed (%i), snd disabled", ret);
 488                         noticeMsgTime = GetTickCount();
 489                         currentConfig.EmuOpt &= ~4;
 490                 } else {
 491                         FrameworkAudio_SetVolume(currentConfig.volume, currentConfig.volume);
 492                         PicoWriteSound = updateSound;
 493                         snd_cbuff = FrameworkAudio_56448Buffer();
 494                         PsndOut = snd_cbuff + snd_cbuf_samples / 2; // start writing at the middle
 495                         snd_all_samples = 0;
 496                         PsndRate_old = PsndRate;
 497                         PicoOpt_old  = PicoOpt;
 498                         pal_old = Pico.m.pal;
 499                 }
 500         }
 501
 502         // loop?
 503         while (engineState == PGS_Running)
 504         {
 505                 int modes;
 506
 507                 tval = GetTickCount();
 508                 if (reset_timing || tval < tval_prev) {
 509                         //stdbg("timing reset");
 510                         reset_timing = 0;
 511                         tval_thissec = tval;
 512                         frames_shown = frames_done = 0;
 513                 }
 514
 515                 // show notice message?
 516                 if (noticeMsgTime) {
 517                         static int noticeMsgSum;
 518                         if (tval - noticeMsgTime > 2000) { // > 2.0 sec
 519                                 noticeMsgTime = 0;
 520                                 clearArea(0);
 521                                 notice = 0;
 522                         } else {
 523                                 int sum = noticeMsg[0]+noticeMsg[1]+noticeMsg[2];
 524                                 if (sum != noticeMsgSum) { clearArea(0); noticeMsgSum = sum; }
 525                                 notice = noticeMsg;
 526                         }
 527                 }
 528
 529                 // check for mode changes
 530                 modes = ((Pico.video.reg[12]&1)<<2)|(Pico.video.reg[1]&8);
 531                 if (modes != oldmodes) {
 532                         oldmodes = modes;
 533                         clearArea(1);
 534                 }
 535
 536                 // second passed?
 537                 if (tval - tval_thissec >= sec_ms)
 538                 {
 539 #ifdef BENCHMARK
 540                         static int bench = 0, bench_fps = 0, bench_fps_s = 0, bfp = 0, bf[4];
 541                         if(++bench == 10) {
 542                                 bench = 0;
 543                                 bench_fps_s = bench_fps;
 544                                 bf[bfp++ & 3] = bench_fps;
 545                                 bench_fps = 0;
 546                         }
 547                         bench_fps += frames_shown;
 548                         sprintf(fpsbuff, "%02i/%02i/%02i", frames_shown, bench_fps_s, (bf[0]+bf[1]+bf[2]+bf[3])>>2);
 549 #else
 550                         if(currentConfig.EmuOpt & 2)
 551                                 sprintf(fpsbuff, "%02i/%02i", frames_shown, frames_done);
 552 #endif
 553                         //tval_thissec += 1000;
 554                         tval_thissec += sec_ms;
 555
 556                         if (PsndOut != NULL)
 557                         {
 558                                 /* some code which tries to sync things to audio clock, the dirty way */
 559                                 static int audio_skew_prev = 0;
 560                                 int audio_skew, adj, co = 9, shift = 7;
 561                                 audio_skew = snd_all_samples*2 - FrameworkAudio_BufferPos();
 562                                 if (PsndRate == 22050) co = 10;
 563                                 if (PsndRate  > 22050) co = 11;
 564                                 if (PicoOpt&8) shift++;
 565                                 if (audio_skew < 0) {
 566                                         adj = -((-audio_skew) >> shift);
 567                                         if (audio_skew > -(6<<co)) adj>>=1;
 568                                         if (audio_skew > -(4<<co)) adj>>=1;
 569                                         if (audio_skew > -(2<<co)) adj>>=1;
 570                                         if (audio_skew > audio_skew_prev) adj>>=2; // going up already
 571                                 } else {
 572                                         adj = audio_skew >> shift;
 573                                         if (audio_skew < (6<<co)) adj>>=1;
 574                                         if (audio_skew < (4<<co)) adj>>=1;
 575                                         if (audio_skew < (2<<co)) adj>>=1;
 576                                         if (audio_skew < audio_skew_prev) adj>>=2;
 577                                 }
 578                                 audio_skew_prev = audio_skew;
 579                                 target_frametime += adj;
 580                                 sec_ms = (target_frametime * target_fps) >> 8;
 581                                 //stdbg("%i %i %i", audio_skew, adj, sec_ms);
 582                                 frames_done = frames_shown = 0;
 583                         }
 584                         else if (currentConfig.Frameskip < 0) {
 585                                 frames_done  -= target_fps; if (frames_done  < 0) frames_done  = 0;
 586                                 frames_shown -= target_fps; if (frames_shown < 0) frames_shown = 0;
 587                                 if (frames_shown > frames_done) frames_shown = frames_done;
 588                         } else {
 589                                 frames_done = frames_shown = 0;
 590                         }
 591                 }
 592 #ifdef PFRAMES
 593                 sprintf(fpsbuff, "%i", Pico.m.frame_count);
 594 #endif
 595
 596                 tval_prev = tval;
 597                 lim_time = (frames_done+1) * target_frametime;
 598                 if (currentConfig.Frameskip >= 0) // frameskip enabled
 599                 {
 600                         for (i = 0; i < currentConfig.Frameskip; i++) {
 601                                 updateKeys();
 602                                 SkipFrame(); frames_done++;
 603                                 if (PsndOut) { // do framelimitting if sound is enabled
 604                                         int tval_diff;
 605                                         tval = GetTickCount();
 606                                         tval_diff = (int)(tval - tval_thissec) << 8;
 607                                         if (tval_diff < lim_time) // we are too fast
 608                                                 simpleWait(tval + ((lim_time - tval_diff)>>8));
 609                                 }
 610                                 lim_time += target_frametime;
 611                         }
 612                 }
 613                 else // auto frameskip
 614                 {
 615                         int tval_diff;
 616                         tval = GetTickCount();
 617                         tval_diff = (int)(tval - tval_thissec) << 8;
 618                         if (tval_diff > lim_time)
 619                         {
 620                                 // no time left for this frame - skip
 621                                 if (tval_diff - lim_time >= (300<<8)) {
 622                                         /* something caused a slowdown for us (disk access? cache flush?)
 623                                          * try to recover by resetting timing... */
 624                                         reset_timing = 1;
 625                                         continue;
 626                                 }
 627                                 updateKeys();
 628                                 SkipFrame(); frames_done++;
 629                                 continue;
 630                         }
 631                 }
 632
 633                 updateKeys();
 634
 635                 if (currentConfig.EmuOpt&0x80)
 636                         /* be sure correct framebuffer is locked */
 637                         giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
 638
 639                 PicoFrame();
 640
 641                 if (giz_screen == NULL)
 642                         giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
 643
 644                 blit(fpsbuff, notice);
 645
 646                 if (giz_screen != NULL) {
 647                         fb_unlock();
 648                         giz_screen = NULL;
 649                 }
 650
 651                 if (currentConfig.EmuOpt&0x2000)
 652                         Framework2D_WaitVSync();
 653
 654                 if (currentConfig.EmuOpt&0x8000)
 655                         fb_flip();
 656
 657                 // check time
 658                 tval = GetTickCount();
 659                 tval_diff = (int)(tval - tval_thissec) << 8;
 660
 661                 if (currentConfig.Frameskip < 0 && tval_diff - lim_time >= (300<<8)) // slowdown detection
 662                         reset_timing = 1;
 663                 else if (PsndOut != NULL || currentConfig.Frameskip < 0)
 664                 {
 665                         // sleep if we are still too fast
 666                         if (tval_diff < lim_time)
 667                         {
 668                                 // we are too fast
 669                                 simpleWait(tval + ((lim_time - tval_diff) >> 8));
 670                         }
 671                 }
 672
 673                 frames_done++; frames_shown++;
 674         }
 675
 676
 677         if (PicoAHW & PAHW_MCD) PicoCDBufferFree();
 678
 679         if (PsndOut != NULL) {
 680                 PsndOut = snd_cbuff = NULL;
 681                 FrameworkAudio_Close();
 682         }
 683
 684         // save SRAM
 685         if ((currentConfig.EmuOpt & 1) && SRam.changed) {
 686                 emu_stateCb("Writing SRAM/BRAM..");
 687                 emu_save_load_game(0, 1);
 688                 SRam.changed = 0;
 689         }
 690 }
 691