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 DWORD noticeMsgTime = 0;
  32 static short *snd_cbuff = NULL;
  33 static int snd_cbuf_samples = 0, snd_all_samples = 0;
  34
  35
  36 static void blit(const char *fps, const char *notice);
  37 static void clearArea(int full);
  38
  39 void plat_status_msg(const char *format, ...)
  40 {
  41         /* TODO */
  42         noticeMsgTime = GetTickCount();
  43 }
  44
  45 int plat_get_root_dir(char *dst, int len)
  46 {
  47         if (len > 0) *dst = 0;
  48
  49         return 0;
  50 }
  51
  52 static void emu_msg_cb(const char *msg)
  53 {
  54         if (giz_screen != NULL) fb_unlock();
  55         giz_screen = fb_lock(1);
  56
  57         memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
  58         emu_textOut16(4, 232, msg);
  59         noticeMsgTime = GetTickCount() - 2000;
  60
  61         /* assumption: emu_msg_cb gets called only when something slow is about to happen */
  62         reset_timing = 1;
  63
  64         fb_unlock();
  65         giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
  66 }
  67
  68 void emu_stateCb(const char *str)
  69 {
  70         if (giz_screen != NULL) fb_unlock();
  71         giz_screen = fb_lock(1);
  72
  73         clearArea(0);
  74         blit("", str);
  75
  76         fb_unlock();
  77         giz_screen = NULL;
  78
  79         Sleep(0); /* yield the CPU, the system may need it */
  80 }
  81
  82 void pemu_prep_defconfig(void)
  83 {
  84         memset(&defaultConfig, 0, sizeof(defaultConfig));
  85         defaultConfig.EmuOpt    = 0x1d | 0x680; // | confirm_save, cd_leds, 16bit rend
  86         defaultConfig.s_PicoOpt = 0x0f | POPT_EN_MCD_PCM|POPT_EN_MCD_CDDA|POPT_EN_SVP_DRC|POPT_ACC_SPRITES;
  87         defaultConfig.s_PsndRate = 22050;
  88         defaultConfig.s_PicoRegion = 0; // auto
  89         defaultConfig.s_PicoAutoRgnOrder = 0x184; // US, EU, JP
  90         defaultConfig.s_PicoCDBuffers = 0;
  91         defaultConfig.Frameskip = -1; // auto
  92         defaultConfig.volume = 50;
  93         defaultConfig.KeyBinds[ 2] = 1<<0; // SACB RLDU
  94         defaultConfig.KeyBinds[ 3] = 1<<1;
  95         defaultConfig.KeyBinds[ 0] = 1<<2;
  96         defaultConfig.KeyBinds[ 1] = 1<<3;
  97         defaultConfig.KeyBinds[ 5] = 1<<4;
  98         defaultConfig.KeyBinds[ 6] = 1<<5;
  99         defaultConfig.KeyBinds[ 7] = 1<<6;
 100         defaultConfig.KeyBinds[ 4] = 1<<7;
 101         defaultConfig.KeyBinds[13] = 1<<26; // switch rend
 102         defaultConfig.KeyBinds[ 8] = 1<<27; // save state
 103         defaultConfig.KeyBinds[ 9] = 1<<28; // load state
 104         defaultConfig.KeyBinds[12] = 1<<29; // vol up
 105         defaultConfig.KeyBinds[11] = 1<<30; // vol down
 106         defaultConfig.scaling = 0;
 107         defaultConfig.turbo_rate = 15;
 108 }
 109
 110
 111 static int EmuScanBegin16(unsigned int num)
 112 {
 113         if (!(Pico.video.reg[1]&8)) num += 8;
 114         DrawLineDest = (unsigned short *) giz_screen + 321 * num;
 115
 116         if ((currentConfig.EmuOpt&0x4000) && (num&1) == 0) // (Pico.m.frame_count&1))
 117                 return 1; // skip next line
 118
 119         return 0;
 120 }
 121
 122 static int EmuScanBegin8(unsigned int num)
 123 {
 124         // draw like the fast renderer
 125         if (!(Pico.video.reg[1]&8)) num += 8;
 126         HighCol = gfx_buffer + 328 * num;
 127
 128         return 0;
 129 }
 130
 131 static void osd_text(int x, int y, const char *text)
 132 {
 133         int len = strlen(text) * 8 / 2;
 134         int *p, h;
 135         for (h = 0; h < 8; h++) {
 136                 p = (int *) ((unsigned short *) giz_screen+x+321*(y+h));
 137                 p = (int *) ((int)p & ~3); // align
 138                 memset32(p, 0, len);
 139         }
 140         emu_textOut16(x, y, text);
 141 }
 142
 143 /*
 144 void log1(void *p1, void *p2)
 145 {
 146         lprintf("%p %p %p\n", p1, p2, DrawLineDest);
 147 }
 148 */
 149
 150 static void cd_leds(void)
 151 {
 152         static int old_reg = 0;
 153         unsigned int col_g, col_r, *p;
 154
 155         if (!((Pico_mcd->s68k_regs[0] ^ old_reg) & 3)) return; // no change
 156         old_reg = Pico_mcd->s68k_regs[0];
 157
 158         p = (unsigned int *)((short *)giz_screen + 321*2+4+2);
 159         col_g = (old_reg & 2) ? 0x06000600 : 0;
 160         col_r = (old_reg & 1) ? 0xc000c000 : 0;
 161         *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r; p += 321/2 - 12/2 + 1;
 162         *p++ = col_g; p+=3; *p++ = col_r; p += 321/2 - 10/2;
 163         *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r;
 164 }
 165
 166
 167 static short localPal[0x100];
 168
 169 static void blit(const char *fps, const char *notice)
 170 {
 171         int emu_opt = currentConfig.EmuOpt;
 172
 173         if (PicoOpt&0x10)
 174         {
 175                 int lines_flags = 224;
 176                 // 8bit fast renderer
 177                 if (Pico.m.dirtyPal) {
 178                         Pico.m.dirtyPal = 0;
 179                         vidConvCpyRGB565(localPal, Pico.cram, 0x40);
 180                 }
 181                 // a hack for VR
 182                 if (PicoRead16Hook == PicoSVPRead16)
 183                         memset32((int *)(PicoDraw2FB+328*8+328*223), 0xe0e0e0e0, 328);
 184                 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
 185                 if (currentConfig.EmuOpt&0x4000)
 186                         lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
 187                 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
 188         }
 189         else if (!(emu_opt&0x80))
 190         {
 191                 int lines_flags;
 192                 // 8bit accurate renderer
 193                 if (Pico.m.dirtyPal) {
 194                         Pico.m.dirtyPal = 0;
 195                         vidConvCpyRGB565(localPal, Pico.cram, 0x40);
 196                         if (Pico.video.reg[0xC]&8) { // shadow/hilight mode
 197                                 //vidConvCpyRGB32sh(localPal+0x40, Pico.cram, 0x40);
 198                                 //vidConvCpyRGB32hi(localPal+0x80, Pico.cram, 0x40); // TODO?
 199                                 memcpy32((void *)(localPal+0xc0), (void *)(localPal+0x40), 0x40*2/4);
 200                                 localPal[0xc0] = 0x0600;
 201                                 localPal[0xd0] = 0xc000;
 202                                 localPal[0xe0] = 0x0000; // reserved pixels for OSD
 203                                 localPal[0xf0] = 0xffff;
 204                         }
 205                         /* no support
 206                         else if (rendstatus & 0x20) { // mid-frame palette changes
 207                                 vidConvCpyRGB565(localPal+0x40, HighPal, 0x40);
 208                                 vidConvCpyRGB565(localPal+0x80, HighPal+0x40, 0x40);
 209                         } */
 210                 }
 211                 lines_flags = (Pico.video.reg[1]&8) ? 240 : 224;
 212                 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
 213                 if (currentConfig.EmuOpt&0x4000)
 214                         lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
 215                 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
 216         }
 217
 218         if (notice || (emu_opt & 2)) {
 219                 int h = 232;
 220                 if (notice)      osd_text(4, h, notice);
 221                 if (emu_opt & 2) osd_text(OSD_FPS_X, h, fps);
 222         }
 223
 224         if ((emu_opt & 0x400) && (PicoAHW & PAHW_MCD))
 225                 cd_leds();
 226 }
 227
 228 // clears whole screen or just the notice area (in all buffers)
 229 static void clearArea(int full)
 230 {
 231         if (giz_screen == NULL)
 232                 giz_screen = fb_lock(1);
 233         if (full) memset32(giz_screen, 0, 320*240*2/4);
 234         else      memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
 235
 236         if (currentConfig.EmuOpt&0x8000) {
 237                 fb_unlock();
 238                 giz_screen = fb_lock(0);
 239                 if (full) memset32(giz_screen, 0, 320*240*2/4);
 240                 else      memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
 241         }
 242 }
 243
 244 static void vidResetMode(void)
 245 {
 246         giz_screen = fb_lock(1);
 247
 248         if (PicoOpt&0x10) {
 249         } else if (currentConfig.EmuOpt&0x80) {
 250                 PicoDrawSetColorFormat(1);
 251                 PicoScanBegin = EmuScanBegin16;
 252         } else {
 253                 PicoDrawSetColorFormat(-1);
 254                 PicoScanBegin = EmuScanBegin8;
 255         }
 256         if ((PicoOpt&0x10) || !(currentConfig.EmuOpt&0x80)) {
 257                 // setup pal for 8-bit modes
 258                 localPal[0xc0] = 0x0600;
 259                 localPal[0xd0] = 0xc000;
 260                 localPal[0xe0] = 0x0000; // reserved pixels for OSD
 261                 localPal[0xf0] = 0xffff;
 262         }
 263         Pico.m.dirtyPal = 1;
 264
 265         memset32(giz_screen, 0, 321*240*2/4);
 266         if (currentConfig.EmuOpt&0x8000) {
 267                 fb_unlock();
 268                 giz_screen = fb_lock(0);
 269                 memset32(giz_screen, 0, 321*240*2/4);
 270         }
 271         fb_unlock();
 272         giz_screen = NULL;
 273 }
 274
 275 /*
 276 #include <stdarg.h>
 277 static void stdbg(const char *fmt, ...)
 278 {
 279         static int cnt = 0;
 280         va_list vl;
 281
 282         sprintf(noticeMsg, "%x ", cnt++);
 283         va_start(vl, fmt);
 284         vsnprintf(noticeMsg+strlen(noticeMsg), sizeof(noticeMsg)-strlen(noticeMsg), fmt, vl);
 285         va_end(vl);
 286
 287         noticeMsgTime = GetTickCount();
 288 }
 289 */
 290
 291 static void updateSound(int len)
 292 {
 293         if (PicoOpt&8) len<<=1;
 294
 295         snd_all_samples += len;
 296         PsndOut += len;
 297         if (PsndOut - snd_cbuff >= snd_cbuf_samples)
 298         {
 299                 //if (PsndOut - snd_cbuff != snd_cbuf_samples)
 300                 //      stdbg("snd diff is %i, not %i", PsndOut - snd_cbuff, snd_cbuf_samples);
 301                 PsndOut = snd_cbuff;
 302         }
 303 }
 304
 305
 306 static void SkipFrame(void)
 307 {
 308         PicoSkipFrame=1;
 309         PicoFrame();
 310         PicoSkipFrame=0;
 311 }
 312
 313 /* forced frame to front buffer */
 314 void pemu_forced_frame(int opts)
 315 {
 316         int po_old = PicoOpt;
 317         int eo_old = currentConfig.EmuOpt;
 318
 319         PicoOpt &= ~0x10;
 320         PicoOpt |= opts|POPT_ACC_SPRITES;
 321         currentConfig.EmuOpt |= 0x80;
 322
 323         if (giz_screen == NULL)
 324                 giz_screen = fb_lock(1);
 325
 326         PicoDrawSetColorFormat(1);
 327         PicoScanBegin = EmuScanBegin16;
 328         Pico.m.dirtyPal = 1;
 329         PicoFrameDrawOnly();
 330
 331         fb_unlock();
 332         giz_screen = NULL;
 333
 334         PicoOpt = po_old;
 335         currentConfig.EmuOpt = eo_old;
 336 }
 337
 338
 339 static void RunEvents(unsigned int which)
 340 {
 341         if (which & 0x1800) // save or load (but not both)
 342         {
 343                 int do_it = 1;
 344
 345                 if (PsndOut != NULL)
 346                         FrameworkAudio_SetPause(1);
 347                 if (giz_screen == NULL)
 348                         giz_screen = fb_lock(1);
 349                 if ( emu_check_save_file(state_slot) &&
 350                                 (( (which & 0x1000) && (currentConfig.EmuOpt & 0x800)) || // load
 351                                  (!(which & 0x1000) && (currentConfig.EmuOpt & 0x200))) ) // save
 352                 {
 353                         int keys;
 354                         blit("", (which & 0x1000) ? "LOAD STATE? (PLAY=yes, STOP=no)" : "OVERWRITE SAVE? (PLAY=yes, STOP=no)");
 355                         while( !((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) )
 356                                 Sleep(50);
 357                         if (keys & PBTN_STOP) do_it = 0;
 358                         while(  ((keys = Framework_PollGetButtons()) & (PBTN_PLAY|PBTN_STOP)) ) // wait for release
 359                                 Sleep(50);
 360                         clearArea(0);
 361                 }
 362
 363                 if (do_it)
 364                 {
 365                         osd_text(4, 232, (which & 0x1000) ? "LOADING GAME" : "SAVING GAME");
 366                         PicoStateProgressCB = emu_stateCb;
 367                         emu_save_load_game((which & 0x1000) >> 12, 0);
 368                         PicoStateProgressCB = NULL;
 369                         Sleep(0);
 370                 }
 371
 372                 if (PsndOut != NULL)
 373                         FrameworkAudio_SetPause(0);
 374                 reset_timing = 1;
 375         }
 376         if (which & 0x0400) // switch renderer
 377         {
 378                 if (PicoOpt&0x10) { PicoOpt&=~0x10; currentConfig.EmuOpt |=  0x80; }
 379                 else              { PicoOpt|= 0x10; currentConfig.EmuOpt &= ~0x80; }
 380
 381                 vidResetMode();
 382
 383                 if (PicoOpt&0x10) {
 384                         strcpy(noticeMsg, " 8bit fast renderer");
 385                 } else if (currentConfig.EmuOpt&0x80) {
 386                         strcpy(noticeMsg, "16bit accurate renderer");
 387                 } else {
 388                         strcpy(noticeMsg, " 8bit accurate renderer");
 389                 }
 390
 391                 noticeMsgTime = GetTickCount();
 392         }
 393         if (which & 0x0300)
 394         {
 395                 if(which&0x0200) {
 396                         state_slot -= 1;
 397                         if(state_slot < 0) state_slot = 9;
 398                 } else {
 399                         state_slot += 1;
 400                         if(state_slot > 9) state_slot = 0;
 401                 }
 402                 sprintf(noticeMsg, "SAVE SLOT %i [%s]", state_slot, emu_check_save_file(state_slot) ? "USED" : "FREE");
 403                 noticeMsgTime = GetTickCount();
 404         }
 405 }
 406
 407 static void updateKeys(void)
 408 {
 409         unsigned int keys, allActions[2] = { 0, 0 }, events;
 410         static unsigned int prevEvents = 0;
 411         int i;
 412
 413         /* FIXME: port to input fw, merge with emu.c:emu_update_input() */
 414         keys = Framework_PollGetButtons();
 415         if (keys & PBTN_HOME)
 416                 engineState = PGS_Menu;
 417
 418         keys &= CONFIGURABLE_KEYS;
 419
 420         PicoPad[0] = allActions[0] & 0xfff;
 421         PicoPad[1] = allActions[1] & 0xfff;
 422
 423         if (allActions[0] & 0x7000) emu_DoTurbo(&PicoPad[0], allActions[0]);
 424         if (allActions[1] & 0x7000) emu_DoTurbo(&PicoPad[1], allActions[1]);
 425
 426         events = (allActions[0] | allActions[1]) >> 16;
 427
 428         // volume is treated in special way and triggered every frame
 429         if ((events & 0x6000) && PsndOut != NULL)
 430         {
 431                 int vol = currentConfig.volume;
 432                 if (events & 0x2000) {
 433                         if (vol < 100) vol++;
 434                 } else {
 435                         if (vol >   0) vol--;
 436                 }
 437                 FrameworkAudio_SetVolume(vol, vol);
 438                 sprintf(noticeMsg, "VOL: %02i ", vol);
 439                 noticeMsgTime = GetTickCount();
 440                 currentConfig.volume = vol;
 441         }
 442
 443         events &= ~prevEvents;
 444         if (events) RunEvents(events);
 445         if (movie_data) emu_updateMovie();
 446
 447         prevEvents = (allActions[0] | allActions[1]) >> 16;
 448 }
 449
 450 void plat_debug_cat(char *str)
 451 {
 452 }
 453
 454 static void simpleWait(DWORD until)
 455 {
 456         DWORD tval;
 457         int diff;
 458
 459         tval = GetTickCount();
 460         diff = (int)until - (int)tval;
 461         if (diff >= 2)
 462                 Sleep(diff - 1);
 463
 464         while ((tval = GetTickCount()) < until && until - tval < 512) // some simple overflow detection
 465                 spend_cycles(1024*2);
 466 }
 467
 468 void pemu_loop(void)
 469 {
 470         static int PsndRate_old = 0, PicoOpt_old = 0, pal_old = 0;
 471         char fpsbuff[24]; // fps count c string
 472         DWORD tval, tval_prev = 0, tval_thissec = 0; // timing
 473         int frames_done = 0, frames_shown = 0, oldmodes = 0, sec_ms = 1000;
 474         int target_fps, target_frametime, lim_time, tval_diff, i;
 475         char *notice = NULL;
 476
 477         lprintf("entered emu_Loop()\n");
 478
 479         fpsbuff[0] = 0;
 480
 481         // make sure we are in correct mode
 482         vidResetMode();
 483         if (currentConfig.scaling) PicoOpt|=0x4000;
 484         else PicoOpt&=~0x4000;
 485         Pico.m.dirtyPal = 1;
 486         oldmodes = ((Pico.video.reg[12]&1)<<2) ^ 0xc;
 487
 488         // pal/ntsc might have changed, reset related stuff
 489         target_fps = Pico.m.pal ? 50 : 60;
 490         target_frametime = Pico.m.pal ? (1000<<8)/50 : (1000<<8)/60+1;
 491         reset_timing = 1;
 492
 493         // prepare CD buffer
 494         if (PicoAHW & PAHW_MCD) PicoCDBufferInit();
 495
 496         // prepare sound stuff
 497         PsndOut = NULL;
 498         if (currentConfig.EmuOpt & 4)
 499         {
 500                 int ret, snd_excess_add, stereo;
 501                 if (PsndRate != PsndRate_old || (PicoOpt&0x0b) != (PicoOpt_old&0x0b) || Pico.m.pal != pal_old) {
 502                         PsndRerate(Pico.m.frame_count ? 1 : 0);
 503                 }
 504                 stereo=(PicoOpt&8)>>3;
 505                 snd_excess_add = ((PsndRate - PsndLen*target_fps)<<16) / target_fps;
 506                 snd_cbuf_samples = (PsndRate<<stereo) * 16 / target_fps;
 507                 lprintf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",
 508                         PsndRate, PsndLen, snd_excess_add, stereo, Pico.m.pal);
 509                 ret = FrameworkAudio_Init(PsndRate, snd_cbuf_samples, stereo);
 510                 if (ret != 0) {
 511                         lprintf("FrameworkAudio_Init() failed: %i\n", ret);
 512                         sprintf(noticeMsg, "sound init failed (%i), snd disabled", ret);
 513                         noticeMsgTime = GetTickCount();
 514                         currentConfig.EmuOpt &= ~4;
 515                 } else {
 516                         FrameworkAudio_SetVolume(currentConfig.volume, currentConfig.volume);
 517                         PicoWriteSound = updateSound;
 518                         snd_cbuff = FrameworkAudio_56448Buffer();
 519                         PsndOut = snd_cbuff + snd_cbuf_samples / 2; // start writing at the middle
 520                         snd_all_samples = 0;
 521                         PsndRate_old = PsndRate;
 522                         PicoOpt_old  = PicoOpt;
 523                         pal_old = Pico.m.pal;
 524                 }
 525         }
 526
 527         // loop?
 528         while (engineState == PGS_Running)
 529         {
 530                 int modes;
 531
 532                 tval = GetTickCount();
 533                 if (reset_timing || tval < tval_prev) {
 534                         //stdbg("timing reset");
 535                         reset_timing = 0;
 536                         tval_thissec = tval;
 537                         frames_shown = frames_done = 0;
 538                 }
 539
 540                 // show notice message?
 541                 if (noticeMsgTime) {
 542                         static int noticeMsgSum;
 543                         if (tval - noticeMsgTime > 2000) { // > 2.0 sec
 544                                 noticeMsgTime = 0;
 545                                 clearArea(0);
 546                                 notice = 0;
 547                         } else {
 548                                 int sum = noticeMsg[0]+noticeMsg[1]+noticeMsg[2];
 549                                 if (sum != noticeMsgSum) { clearArea(0); noticeMsgSum = sum; }
 550                                 notice = noticeMsg;
 551                         }
 552                 }
 553
 554                 // check for mode changes
 555                 modes = ((Pico.video.reg[12]&1)<<2)|(Pico.video.reg[1]&8);
 556                 if (modes != oldmodes) {
 557                         oldmodes = modes;
 558                         clearArea(1);
 559                 }
 560
 561                 // second passed?
 562                 if (tval - tval_thissec >= sec_ms)
 563                 {
 564 #ifdef BENCHMARK
 565                         static int bench = 0, bench_fps = 0, bench_fps_s = 0, bfp = 0, bf[4];
 566                         if(++bench == 10) {
 567                                 bench = 0;
 568                                 bench_fps_s = bench_fps;
 569                                 bf[bfp++ & 3] = bench_fps;
 570                                 bench_fps = 0;
 571                         }
 572                         bench_fps += frames_shown;
 573                         sprintf(fpsbuff, "%02i/%02i/%02i", frames_shown, bench_fps_s, (bf[0]+bf[1]+bf[2]+bf[3])>>2);
 574 #else
 575                         if(currentConfig.EmuOpt & 2)
 576                                 sprintf(fpsbuff, "%02i/%02i", frames_shown, frames_done);
 577 #endif
 578                         //tval_thissec += 1000;
 579                         tval_thissec += sec_ms;
 580
 581                         if (PsndOut != NULL)
 582                         {
 583                                 /* some code which tries to sync things to audio clock, the dirty way */
 584                                 static int audio_skew_prev = 0;
 585                                 int audio_skew, adj, co = 9, shift = 7;
 586                                 audio_skew = snd_all_samples*2 - FrameworkAudio_BufferPos();
 587                                 if (PsndRate == 22050) co = 10;
 588                                 if (PsndRate  > 22050) co = 11;
 589                                 if (PicoOpt&8) shift++;
 590                                 if (audio_skew < 0) {
 591                                         adj = -((-audio_skew) >> shift);
 592                                         if (audio_skew > -(6<<co)) adj>>=1;
 593                                         if (audio_skew > -(4<<co)) adj>>=1;
 594                                         if (audio_skew > -(2<<co)) adj>>=1;
 595                                         if (audio_skew > audio_skew_prev) adj>>=2; // going up already
 596                                 } else {
 597                                         adj = audio_skew >> shift;
 598                                         if (audio_skew < (6<<co)) adj>>=1;
 599                                         if (audio_skew < (4<<co)) adj>>=1;
 600                                         if (audio_skew < (2<<co)) adj>>=1;
 601                                         if (audio_skew < audio_skew_prev) adj>>=2;
 602                                 }
 603                                 audio_skew_prev = audio_skew;
 604                                 target_frametime += adj;
 605                                 sec_ms = (target_frametime * target_fps) >> 8;
 606                                 //stdbg("%i %i %i", audio_skew, adj, sec_ms);
 607                                 frames_done = frames_shown = 0;
 608                         }
 609                         else if (currentConfig.Frameskip < 0) {
 610                                 frames_done  -= target_fps; if (frames_done  < 0) frames_done  = 0;
 611                                 frames_shown -= target_fps; if (frames_shown < 0) frames_shown = 0;
 612                                 if (frames_shown > frames_done) frames_shown = frames_done;
 613                         } else {
 614                                 frames_done = frames_shown = 0;
 615                         }
 616                 }
 617 #ifdef PFRAMES
 618                 sprintf(fpsbuff, "%i", Pico.m.frame_count);
 619 #endif
 620
 621                 tval_prev = tval;
 622                 lim_time = (frames_done+1) * target_frametime;
 623                 if (currentConfig.Frameskip >= 0) // frameskip enabled
 624                 {
 625                         for (i = 0; i < currentConfig.Frameskip; i++) {
 626                                 updateKeys();
 627                                 SkipFrame(); frames_done++;
 628                                 if (PsndOut) { // do framelimitting if sound is enabled
 629                                         int tval_diff;
 630                                         tval = GetTickCount();
 631                                         tval_diff = (int)(tval - tval_thissec) << 8;
 632                                         if (tval_diff < lim_time) // we are too fast
 633                                                 simpleWait(tval + ((lim_time - tval_diff)>>8));
 634                                 }
 635                                 lim_time += target_frametime;
 636                         }
 637                 }
 638                 else // auto frameskip
 639                 {
 640                         int tval_diff;
 641                         tval = GetTickCount();
 642                         tval_diff = (int)(tval - tval_thissec) << 8;
 643                         if (tval_diff > lim_time)
 644                         {
 645                                 // no time left for this frame - skip
 646                                 if (tval_diff - lim_time >= (300<<8)) {
 647                                         /* something caused a slowdown for us (disk access? cache flush?)
 648                                          * try to recover by resetting timing... */
 649                                         reset_timing = 1;
 650                                         continue;
 651                                 }
 652                                 updateKeys();
 653                                 SkipFrame(); frames_done++;
 654                                 continue;
 655                         }
 656                 }
 657
 658                 updateKeys();
 659
 660                 if (currentConfig.EmuOpt&0x80)
 661                         /* be sure correct framebuffer is locked */
 662                         giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
 663
 664                 PicoFrame();
 665
 666                 if (giz_screen == NULL)
 667                         giz_screen = fb_lock((currentConfig.EmuOpt&0x8000) ? 0 : 1);
 668
 669                 blit(fpsbuff, notice);
 670
 671                 if (giz_screen != NULL) {
 672                         fb_unlock();
 673                         giz_screen = NULL;
 674                 }
 675
 676                 if (currentConfig.EmuOpt&0x2000)
 677                         Framework2D_WaitVSync();
 678
 679                 if (currentConfig.EmuOpt&0x8000)
 680                         fb_flip();
 681
 682                 // check time
 683                 tval = GetTickCount();
 684                 tval_diff = (int)(tval - tval_thissec) << 8;
 685
 686                 if (currentConfig.Frameskip < 0 && tval_diff - lim_time >= (300<<8)) // slowdown detection
 687                         reset_timing = 1;
 688                 else if (PsndOut != NULL || currentConfig.Frameskip < 0)
 689                 {
 690                         // sleep if we are still too fast
 691                         if (tval_diff < lim_time)
 692                         {
 693                                 // we are too fast
 694                                 simpleWait(tval + ((lim_time - tval_diff) >> 8));
 695                         }
 696                 }
 697
 698                 frames_done++; frames_shown++;
 699         }
 700
 701
 702         if (PicoAHW & PAHW_MCD) PicoCDBufferFree();
 703
 704         if (PsndOut != NULL) {
 705                 PsndOut = snd_cbuff = NULL;
 706                 FrameworkAudio_Close();
 707         }
 708
 709         // save SRAM
 710         if ((currentConfig.EmuOpt & 1) && SRam.changed) {
 711                 emu_stateCb("Writing SRAM/BRAM..");
 712                 emu_save_load_game(0, 1);
 713                 SRam.changed = 0;
 714         }
 715 }
 716