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 "emu.h"
  14 #include "menu.h"
  15 #include "giz.h"
  16 #include "asm_utils.h"
  17
  18 #include <Pico/PicoInt.h>
  19
  20 #ifdef BENCHMARK
  21 #define OSD_FPS_X 220
  22 #else
  23 #define OSD_FPS_X 260
  24 #endif
  25
  26 // main 300K gfx-related buffer. Used by menu and renderers.
  27 unsigned char gfx_buffer[321*240*2*2];
  28 char romFileName[MAX_PATH];
  29 int engineState;
  30
  31 unsigned char *PicoDraw2FB = gfx_buffer;  // temporary buffer for alt renderer ( (8+320)*(8+240+8) )
  32 int reset_timing = 0;
  33
  34 static int combo_keys = 0, combo_acts = 0; // keys and actions which need button combos
  35 static DWORD noticeMsgTime = 0;
  36 static short *snd_cbuff = NULL;
  37 static int snd_cbuf_samples = 0, snd_all_samples = 0;
  38
  39
  40 static void blit(const char *fps, const char *notice);
  41 static void clearArea(int full);
  42
  43 void emu_noticeMsgUpdated(void)
  44 {
  45         noticeMsgTime = GetTickCount();
  46 }
  47
  48 void emu_getMainDir(char *dst, int len)
  49 {
  50         if (len > 0) *dst = 0;
  51 }
  52
  53 static void emu_msg_cb(const char *msg)
  54 {
  55         if (giz_screen == NULL)
  56                 giz_screen = Framework2D_LockBuffer();
  57
  58         memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
  59         emu_textOut16(4, 232, msg);
  60         noticeMsgTime = GetTickCount() - 2000;
  61
  62         /* assumption: emu_msg_cb gets called only when something slow is about to happen */
  63         reset_timing = 1;
  64 }
  65
  66 static void emu_state_cb(const char *str)
  67 {
  68         if (giz_screen == NULL)
  69                 giz_screen = Framework2D_LockBuffer();
  70
  71         clearArea(0);
  72         blit("", str);
  73
  74         Framework2D_UnlockBuffer();
  75         giz_screen = NULL;
  76
  77         Sleep(0); /* yield the CPU, the system may need it */
  78 }
  79
  80 static void emu_msg_tray_open(void)
  81 {
  82         strcpy(noticeMsg, "CD tray opened");
  83         noticeMsgTime = GetTickCount();
  84 }
  85
  86
  87 void emu_Init(void)
  88 {
  89         // make dirs for saves, cfgs, etc.
  90         mkdir("mds", 0777);
  91         mkdir("srm", 0777);
  92         mkdir("brm", 0777);
  93         mkdir("cfg", 0777);
  94
  95         PicoInit();
  96         PicoMessage = emu_msg_cb;
  97         PicoMCDopenTray = emu_msg_tray_open;
  98         PicoMCDcloseTray = menu_loop_tray;
  99 }
 100
 101 void emu_Deinit(void)
 102 {
 103         // save SRAM
 104         if((currentConfig.EmuOpt & 1) && SRam.changed) {
 105                 emu_SaveLoadGame(0, 1);
 106                 SRam.changed = 0;
 107         }
 108
 109         if (!(currentConfig.EmuOpt & 0x20)) {
 110                 FILE *f = fopen(PicoConfigFile, "r+b");
 111                 if (!f) emu_WriteConfig(0);
 112                 else {
 113                         // if we already have config, reload it, except last ROM
 114                         fseek(f, sizeof(currentConfig.lastRomFile), SEEK_SET);
 115                         fread(&currentConfig.EmuOpt, 1, sizeof(currentConfig) - sizeof(currentConfig.lastRomFile), f);
 116                         fseek(f, 0, SEEK_SET);
 117                         fwrite(&currentConfig, 1, sizeof(currentConfig), f);
 118                         fflush(f);
 119                         fclose(f);
 120                 }
 121         }
 122
 123         PicoExit();
 124 }
 125
 126 void emu_setDefaultConfig(void)
 127 {
 128         memset(&currentConfig, 0, sizeof(currentConfig));
 129         currentConfig.lastRomFile[0] = 0;
 130         currentConfig.EmuOpt  = 0x1f | 0x680; // | confirm_save, cd_leds, 16bit rend
 131         currentConfig.PicoOpt = 0x07 | 0xc00; // | cd_pcm, cd_cdda
 132         currentConfig.PsndRate = 22050;
 133         currentConfig.PicoRegion = 0; // auto
 134         currentConfig.PicoAutoRgnOrder = 0x184; // US, EU, JP
 135         currentConfig.Frameskip = -1; // auto
 136         currentConfig.volume = 50;
 137         currentConfig.KeyBinds[ 2] = 1<<0; // SACB RLDU
 138         currentConfig.KeyBinds[ 3] = 1<<1;
 139         currentConfig.KeyBinds[ 0] = 1<<2;
 140         currentConfig.KeyBinds[ 1] = 1<<3;
 141         currentConfig.KeyBinds[ 5] = 1<<4;
 142         currentConfig.KeyBinds[ 6] = 1<<5;
 143         currentConfig.KeyBinds[ 7] = 1<<6;
 144         currentConfig.KeyBinds[ 4] = 1<<7;
 145         currentConfig.KeyBinds[13] = 1<<26; // switch rend
 146         currentConfig.KeyBinds[ 8] = 1<<27; // save state
 147         currentConfig.KeyBinds[ 9] = 1<<28; // load state
 148         currentConfig.KeyBinds[12] = 1<<29; // vol up
 149         currentConfig.KeyBinds[11] = 1<<30; // vol down
 150         currentConfig.PicoCDBuffers = 0;
 151         currentConfig.scaling = 0;
 152 }
 153
 154
 155 static int EmuScan16(unsigned int num, void *sdata)
 156 {
 157         if (!(Pico.video.reg[1]&8)) num += 8;
 158         DrawLineDest = (unsigned short *) giz_screen + 321*(num+1);
 159
 160         if ((currentConfig.EmuOpt&0x4000) && (num&1) == (Pico.m.frame_count&1))
 161                 return 1; // skip next line
 162
 163         return 0;
 164 }
 165
 166 static int EmuScan8(unsigned int num, void *sdata)
 167 {
 168         // draw like the fast renderer
 169         if (!(Pico.video.reg[1]&8)) num += 8;
 170         HighCol = gfx_buffer + 328*(num+1);
 171
 172         return 0;
 173 }
 174
 175 static void osd_text(int x, int y, const char *text)
 176 {
 177         int len = strlen(text) * 8 / 2;
 178         int *p, h;
 179         for (h = 0; h < 8; h++) {
 180                 p = (int *) ((unsigned short *) giz_screen+x+321*(y+h));
 181                 p = (int *) ((int)p & ~3); // align
 182                 memset32(p, 0, len);
 183         }
 184         emu_textOut16(x, y, text);
 185 }
 186
 187 /*
 188 void log1(void *p1, void *p2)
 189 {
 190         lprintf("%p %p %p\n", p1, p2, DrawLineDest);
 191 }
 192 */
 193
 194 static void cd_leds(void)
 195 {
 196         static int old_reg = 0;
 197         unsigned int col_g, col_r, *p;
 198
 199         if (!((Pico_mcd->s68k_regs[0] ^ old_reg) & 3)) return; // no change
 200         old_reg = Pico_mcd->s68k_regs[0];
 201
 202         p = (unsigned int *)((short *)giz_screen + 321*2+4+2);
 203         col_g = (old_reg & 2) ? 0x06000600 : 0;
 204         col_r = (old_reg & 1) ? 0xc000c000 : 0;
 205         *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r; p += 321/2 - 12/2 + 1;
 206         *p++ = col_g; p+=3; *p++ = col_r; p += 321/2 - 10/2;
 207         *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r;
 208 }
 209
 210
 211 static short localPal[0x100];
 212
 213 static void blit(const char *fps, const char *notice)
 214 {
 215         int emu_opt = currentConfig.EmuOpt;
 216
 217         if (PicoOpt&0x10)
 218         {
 219                 int lines_flags = 224;
 220                 // 8bit fast renderer
 221                 if (Pico.m.dirtyPal) {
 222                         Pico.m.dirtyPal = 0;
 223                         vidConvCpyRGB565(localPal, Pico.cram, 0x40);
 224                 }
 225                 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
 226                 if (currentConfig.EmuOpt&0x4000)
 227                         lines_flags|=(Pico.m.frame_count&1)?0x20000:0x40000;
 228                 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
 229         }
 230         else if (!(emu_opt&0x80))
 231         {
 232                 int lines_flags;
 233                 // 8bit accurate renderer
 234                 if (Pico.m.dirtyPal) {
 235                         Pico.m.dirtyPal = 0;
 236                         vidConvCpyRGB565(localPal, Pico.cram, 0x40);
 237                         if (Pico.video.reg[0xC]&8) { // shadow/hilight mode
 238                                 //vidConvCpyRGB32sh(localPal+0x40, Pico.cram, 0x40);
 239                                 //vidConvCpyRGB32hi(localPal+0x80, Pico.cram, 0x40); // TODO?
 240                                 blockcpy(localPal+0xc0, localPal+0x40, 0x40*2);
 241                                 localPal[0xc0] = 0x0600;
 242                                 localPal[0xd0] = 0xc000;
 243                                 localPal[0xe0] = 0x0000; // reserved pixels for OSD
 244                                 localPal[0xf0] = 0xffff;
 245                         }
 246                         /* no support
 247                         else if (rendstatus & 0x20) { // mid-frame palette changes
 248                                 vidConvCpyRGB565(localPal+0x40, HighPal, 0x40);
 249                                 vidConvCpyRGB565(localPal+0x80, HighPal+0x40, 0x40);
 250                         } */
 251                 }
 252                 lines_flags = (Pico.video.reg[1]&8) ? 240 : 224;
 253                 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
 254                 if (currentConfig.EmuOpt&0x4000)
 255                         lines_flags|=(Pico.m.frame_count&1)?0x20000:0x40000;
 256                 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
 257         }
 258
 259         if (notice || (emu_opt & 2)) {
 260                 int h = 232;
 261                 if (notice)      osd_text(4, h, notice);
 262                 if (emu_opt & 2) osd_text(OSD_FPS_X, h, fps);
 263         }
 264
 265         if ((emu_opt & 0x400) && (PicoMCD & 1))
 266                 cd_leds();
 267 }
 268
 269 // clears whole screen or just the notice area (in all buffers)
 270 static void clearArea(int full)
 271 {
 272         if (giz_screen == NULL)
 273                 giz_screen = Framework2D_LockBuffer();
 274         if (full) memset32(giz_screen, 0, 320*240*2/4);
 275         else      memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
 276 }
 277
 278 static void vidResetMode(void)
 279 {
 280         giz_screen = Framework2D_LockBuffer();
 281
 282         if (PicoOpt&0x10) {
 283         } else if (currentConfig.EmuOpt&0x80) {
 284                 PicoDrawSetColorFormat(1);
 285                 PicoScan = EmuScan16;
 286         } else {
 287                 PicoDrawSetColorFormat(-1);
 288                 PicoScan = EmuScan8;
 289         }
 290         if ((PicoOpt&0x10) || !(currentConfig.EmuOpt&0x80)) {
 291                 // setup pal for 8-bit modes
 292                 localPal[0xc0] = 0x0600;
 293                 localPal[0xd0] = 0xc000;
 294                 localPal[0xe0] = 0x0000; // reserved pixels for OSD
 295                 localPal[0xf0] = 0xffff;
 296         }
 297         Pico.m.dirtyPal = 1;
 298
 299         memset32(giz_screen, 0, 321*240*2/4);
 300         Framework2D_UnlockBuffer();
 301         giz_screen = NULL;
 302 }
 303
 304 /*
 305 #include <stdarg.h>
 306 static void stdbg(const char *fmt, ...)
 307 {
 308         static int cnt = 0;
 309         va_list vl;
 310
 311         sprintf(noticeMsg, "%x ", cnt++);
 312         va_start(vl, fmt);
 313         vsnprintf(noticeMsg+strlen(noticeMsg), sizeof(noticeMsg)-strlen(noticeMsg), fmt, vl);
 314         va_end(vl);
 315
 316         noticeMsgTime = GetTickCount();
 317 }
 318 */
 319
 320 static void updateSound(int len)
 321 {
 322         if (PicoOpt&8) len<<=1;
 323
 324         snd_all_samples += len;
 325         PsndOut += len;
 326         if (PsndOut - snd_cbuff >= snd_cbuf_samples)
 327         {
 328                 //if (PsndOut - snd_cbuff != snd_cbuf_samples)
 329                 //      stdbg("snd diff is %i, not %i", PsndOut - snd_cbuff, snd_cbuf_samples);
 330                 PsndOut = snd_cbuff;
 331         }
 332 }
 333
 334
 335 static void SkipFrame(void)
 336 {
 337         PicoSkipFrame=1;
 338         PicoFrame();
 339         PicoSkipFrame=0;
 340 }
 341
 342 void emu_forcedFrame(void)
 343 {
 344         int po_old = PicoOpt;
 345         int eo_old = currentConfig.EmuOpt;
 346
 347         PicoOpt &= ~0x0010;
 348         PicoOpt |=  0x4080; // soft_scale | acc_sprites
 349         currentConfig.EmuOpt |= 0x80;
 350
 351         if (giz_screen == NULL)
 352                 giz_screen = Framework2D_LockBuffer();
 353
 354         PicoDrawSetColorFormat(1);
 355         PicoScan = EmuScan16;
 356         PicoScan((unsigned) -1, NULL);
 357         Pico.m.dirtyPal = 1;
 358         PicoFrameDrawOnly();
 359
 360         Framework2D_UnlockBuffer();
 361         giz_screen = NULL;
 362
 363         PicoOpt = po_old;
 364         currentConfig.EmuOpt = eo_old;
 365 }
 366
 367
 368 static void RunEvents(unsigned int which)
 369 {
 370         if (which & 0x1800) // save or load (but not both)
 371         {
 372                 int do_it = 1;
 373
 374                 if (PsndOut != NULL)
 375                         FrameworkAudio_SetPause(1);
 376                 if (giz_screen == NULL)
 377                         giz_screen = Framework2D_LockBuffer();
 378                 if ( emu_checkSaveFile(state_slot) &&
 379                                 (( (which & 0x1000) && (currentConfig.EmuOpt & 0x800)) || // load
 380                                  (!(which & 0x1000) && (currentConfig.EmuOpt & 0x200))) ) // save
 381                 {
 382                         int keys;
 383                         blit("", (which & 0x1000) ? "LOAD STATE? (PLAY=yes, STOP=no)" : "OVERWRITE SAVE? (PLAY=yes, STOP=no)");
 384                         while( !((keys = Framework_PollGetButtons()) & (BTN_PLAY|BTN_STOP)) )
 385                                 Sleep(50);
 386                         if (keys & BTN_STOP) do_it = 0;
 387                         while(  ((keys = Framework_PollGetButtons()) & (BTN_PLAY|BTN_STOP)) ) // wait for release
 388                                 Sleep(50);
 389                         clearArea(0);
 390                 }
 391
 392                 if (do_it)
 393                 {
 394                         osd_text(4, 232, (which & 0x1000) ? "LOADING GAME" : "SAVING GAME");
 395                         PicoStateProgressCB = emu_state_cb;
 396                         emu_SaveLoadGame((which & 0x1000) >> 12, 0);
 397                         PicoStateProgressCB = NULL;
 398                         Sleep(0);
 399                 }
 400
 401                 if (PsndOut != NULL)
 402                         FrameworkAudio_SetPause(0);
 403                 reset_timing = 1;
 404         }
 405         if (which & 0x0400) // switch renderer
 406         {
 407                 if (PicoOpt&0x10) { PicoOpt&=~0x10; currentConfig.EmuOpt |=  0x80; }
 408                 else              { PicoOpt|= 0x10; currentConfig.EmuOpt &= ~0x80; }
 409
 410                 vidResetMode();
 411
 412                 if (PicoOpt&0x10) {
 413                         strcpy(noticeMsg, " 8bit fast renderer");
 414                 } else if (currentConfig.EmuOpt&0x80) {
 415                         strcpy(noticeMsg, "16bit accurate renderer");
 416                 } else {
 417                         strcpy(noticeMsg, " 8bit accurate renderer");
 418                 }
 419
 420                 noticeMsgTime = GetTickCount();
 421         }
 422         if (which & 0x0300)
 423         {
 424                 if(which&0x0200) {
 425                         state_slot -= 1;
 426                         if(state_slot < 0) state_slot = 9;
 427                 } else {
 428                         state_slot += 1;
 429                         if(state_slot > 9) state_slot = 0;
 430                 }
 431                 sprintf(noticeMsg, "SAVE SLOT %i [%s]", state_slot, emu_checkSaveFile(state_slot) ? "USED" : "FREE");
 432                 noticeMsgTime = GetTickCount();
 433         }
 434 }
 435
 436 static void updateKeys(void)
 437 {
 438         unsigned int keys, allActions[2] = { 0, 0 }, events;
 439         static unsigned int prevEvents = 0;
 440         int i;
 441
 442         keys = Framework_PollGetButtons();
 443         if (keys & BTN_HOME)
 444                 engineState = PGS_Menu;
 445
 446         keys &= CONFIGURABLE_KEYS;
 447
 448         for (i = 0; i < 32; i++)
 449         {
 450                 if (keys & (1 << i))
 451                 {
 452                         int pl, acts = currentConfig.KeyBinds[i];
 453                         if (!acts) continue;
 454                         pl = (acts >> 16) & 1;
 455                         if (combo_keys & (1 << i))
 456                         {
 457                                 int u = i+1, acts_c = acts & combo_acts;
 458                                 // let's try to find the other one
 459                                 if (acts_c)
 460                                         for (; u < 32; u++)
 461                                                 if ( (currentConfig.KeyBinds[u] & acts_c) && (keys & (1 << u)) ) {
 462                                                         allActions[pl] |= acts_c;
 463                                                         keys &= ~((1 << i) | (1 << u));
 464                                                         break;
 465                                                 }
 466                                 // add non-combo actions if combo ones were not found
 467                                 if (!acts_c || u == 32)
 468                                         allActions[pl] |= acts & ~combo_acts;
 469                         } else {
 470                                 allActions[pl] |= acts;
 471                         }
 472                 }
 473         }
 474
 475         PicoPad[0] = (unsigned short) allActions[0];
 476         PicoPad[1] = (unsigned short) allActions[1];
 477
 478         events = (allActions[0] | allActions[1]) >> 16;
 479
 480         // volume is treated in special way and triggered every frame
 481         if ((events & 0x6000) && PsndOut != NULL)
 482         {
 483                 int vol = currentConfig.volume;
 484                 if (events & 0x2000) {
 485                         if (vol < 100) vol++;
 486                 } else {
 487                         if (vol >   0) vol--;
 488                 }
 489                 FrameworkAudio_SetVolume(vol, vol);
 490                 sprintf(noticeMsg, "VOL: %02i", vol);
 491                 noticeMsgTime = GetTickCount();
 492                 currentConfig.volume = vol;
 493         }
 494
 495         events &= ~prevEvents;
 496         if (events) RunEvents(events);
 497         if (movie_data) emu_updateMovie();
 498
 499         prevEvents = (allActions[0] | allActions[1]) >> 16;
 500 }
 501
 502 static void find_combos(void)
 503 {
 504         int act, u;
 505
 506         // find out which keys and actions are combos
 507         combo_keys = combo_acts = 0;
 508         for (act = 0; act < 32; act++)
 509         {
 510                 int keyc = 0;
 511                 if (act == 16 || act == 17) continue; // player2 flag
 512                 for (u = 0; u < 32; u++)
 513                 {
 514                         if (currentConfig.KeyBinds[u] & (1 << act)) keyc++;
 515                 }
 516                 if (keyc > 1)
 517                 {
 518                         // loop again and mark those keys and actions as combo
 519                         for (u = 0; u < 32; u++)
 520                         {
 521                                 if (currentConfig.KeyBinds[u] & (1 << act)) {
 522                                         combo_keys |= 1 << u;
 523                                         combo_acts |= 1 << act;
 524                                 }
 525                         }
 526                 }
 527         }
 528 }
 529
 530
 531 static void simpleWait(DWORD until)
 532 {
 533         DWORD tval;
 534         int diff;
 535
 536         tval = GetTickCount();
 537         diff = (int)until - (int)tval;
 538         if (diff >= 2)
 539                 Sleep(diff - 1);
 540
 541         while ((tval = GetTickCount()) < until && until - tval < 512) // some simple overflow detection
 542                 spend_cycles(1024*2);
 543 }
 544
 545 void emu_Loop(void)
 546 {
 547         static int PsndRate_old = 0, PicoOpt_old = 0, pal_old = 0;
 548         char fpsbuff[24]; // fps count c string
 549         DWORD tval, tval_prev = 0, tval_thissec = 0; // timing
 550         int frames_done = 0, frames_shown = 0, oldmodes = 0, sec_ms = 1000;
 551         int target_fps, target_frametime, lim_time, tval_diff, i;
 552         char *notice = NULL;
 553
 554         lprintf("entered emu_Loop()\n");
 555
 556         fpsbuff[0] = 0;
 557
 558         // make sure we are in correct mode
 559         vidResetMode();
 560         if (currentConfig.scaling) PicoOpt|=0x4000;
 561         else PicoOpt&=~0x4000;
 562         Pico.m.dirtyPal = 1;
 563         oldmodes = ((Pico.video.reg[12]&1)<<2) ^ 0xc;
 564         find_combos();
 565
 566         // pal/ntsc might have changed, reset related stuff
 567         target_fps = Pico.m.pal ? 50 : 60;
 568         target_frametime = Pico.m.pal ? (1000<<8)/50 : (1000<<8)/60+1;
 569         reset_timing = 1;
 570
 571         // prepare CD buffer
 572         if (PicoMCD & 1) PicoCDBufferInit();
 573
 574         // prepare sound stuff
 575         PsndOut = NULL;
 576         if (currentConfig.EmuOpt & 4)
 577         {
 578                 int ret, snd_excess_add, stereo;
 579                 if (PsndRate != PsndRate_old || (PicoOpt&0x0b) != (PicoOpt_old&0x0b) || Pico.m.pal != pal_old) {
 580                         sound_rerate(Pico.m.frame_count ? 1 : 0);
 581                 }
 582                 stereo=(PicoOpt&8)>>3;
 583                 snd_excess_add = ((PsndRate - PsndLen*target_fps)<<16) / target_fps;
 584                 snd_cbuf_samples = (PsndRate<<stereo) * 16 / target_fps;
 585                 lprintf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",
 586                         PsndRate, PsndLen, snd_excess_add, stereo, Pico.m.pal);
 587                 ret = FrameworkAudio_Init(PsndRate, snd_cbuf_samples, stereo);
 588                 if (ret != 0) {
 589                         lprintf("FrameworkAudio_Init() failed: %i\n", ret);
 590                         sprintf(noticeMsg, "sound init failed (%i), snd disabled", ret);
 591                         noticeMsgTime = GetTickCount();
 592                         currentConfig.EmuOpt &= ~4;
 593                 } else {
 594                         FrameworkAudio_SetVolume(currentConfig.volume, currentConfig.volume);
 595                         PicoWriteSound = updateSound;
 596                         snd_cbuff = FrameworkAudio_56448Buffer();
 597                         PsndOut = snd_cbuff + snd_cbuf_samples / 2; // start writing at the middle
 598                         snd_all_samples = 0;
 599                         PsndRate_old = PsndRate;
 600                         PicoOpt_old  = PicoOpt;
 601                         pal_old = Pico.m.pal;
 602                 }
 603         }
 604
 605         // loop?
 606         while (engineState == PGS_Running)
 607         {
 608                 int modes;
 609
 610                 tval = GetTickCount();
 611                 if (reset_timing || tval < tval_prev) {
 612                         //stdbg("timing reset");
 613                         reset_timing = 0;
 614                         tval_thissec = tval;
 615                         frames_shown = frames_done = 0;
 616                 }
 617
 618                 // show notice message?
 619                 if (noticeMsgTime) {
 620                         static int noticeMsgSum;
 621                         if (tval - noticeMsgTime > 2000) { // > 2.0 sec
 622                                 noticeMsgTime = 0;
 623                                 clearArea(0);
 624                                 notice = 0;
 625                         } else {
 626                                 int sum = noticeMsg[0]+noticeMsg[1]+noticeMsg[2];
 627                                 if (sum != noticeMsgSum) { clearArea(0); noticeMsgSum = sum; }
 628                                 notice = noticeMsg;
 629                         }
 630                 }
 631
 632                 // check for mode changes
 633                 modes = ((Pico.video.reg[12]&1)<<2)|(Pico.video.reg[1]&8);
 634                 if (modes != oldmodes) {
 635                         oldmodes = modes;
 636                         clearArea(1);
 637                 }
 638
 639                 // second passed?
 640                 if (tval - tval_thissec >= sec_ms)
 641                 {
 642 #ifdef BENCHMARK
 643                         static int bench = 0, bench_fps = 0, bench_fps_s = 0, bfp = 0, bf[4];
 644                         if(++bench == 10) {
 645                                 bench = 0;
 646                                 bench_fps_s = bench_fps;
 647                                 bf[bfp++ & 3] = bench_fps;
 648                                 bench_fps = 0;
 649                         }
 650                         bench_fps += frames_shown;
 651                         sprintf(fpsbuff, "%02i/%02i/%02i", frames_shown, bench_fps_s, (bf[0]+bf[1]+bf[2]+bf[3])>>2);
 652 #else
 653                         if(currentConfig.EmuOpt & 2)
 654                                 sprintf(fpsbuff, "%02i/%02i", frames_shown, frames_done);
 655 #endif
 656                         //tval_thissec += 1000;
 657                         tval_thissec += sec_ms;
 658
 659                         if (PsndOut != NULL)
 660                         {
 661                                 /* some code which tries to sync things to audio clock, the dirty way */
 662                                 static int audio_skew_prev = 0;
 663                                 int audio_skew, adj, co = 9, shift = 7;
 664                                 audio_skew = snd_all_samples*2 - FrameworkAudio_BufferPos();
 665                                 if (PsndRate == 22050) co = 10;
 666                                 if (PsndRate  > 22050) co = 11;
 667                                 if (PicoOpt&8) shift++;
 668                                 if (audio_skew < 0) {
 669                                         adj = -((-audio_skew) >> shift);
 670                                         if (audio_skew > -(6<<co)) adj>>=1;
 671                                         if (audio_skew > -(4<<co)) adj>>=1;
 672                                         if (audio_skew > -(2<<co)) adj>>=1;
 673                                         if (audio_skew > audio_skew_prev) adj>>=2; // going up already
 674                                 } else {
 675                                         adj = audio_skew >> shift;
 676                                         if (audio_skew < (6<<co)) adj>>=1;
 677                                         if (audio_skew < (4<<co)) adj>>=1;
 678                                         if (audio_skew < (2<<co)) adj>>=1;
 679                                         if (audio_skew < audio_skew_prev) adj>>=2;
 680                                 }
 681                                 audio_skew_prev = audio_skew;
 682                                 target_frametime += adj;
 683                                 sec_ms = (target_frametime * target_fps) >> 8;
 684                                 //stdbg("%i %i %i", audio_skew, adj, sec_ms);
 685                                 frames_done = frames_shown = 0;
 686                         }
 687                         else if (currentConfig.Frameskip < 0) {
 688                                 frames_done  -= target_fps; if (frames_done  < 0) frames_done  = 0;
 689                                 frames_shown -= target_fps; if (frames_shown < 0) frames_shown = 0;
 690                                 if (frames_shown > frames_done) frames_shown = frames_done;
 691                         } else {
 692                                 frames_done = frames_shown = 0;
 693                         }
 694                 }
 695 #ifdef PFRAMES
 696                 sprintf(fpsbuff, "%i", Pico.m.frame_count);
 697 #endif
 698
 699                 tval_prev = tval;
 700                 lim_time = (frames_done+1) * target_frametime;
 701                 if (currentConfig.Frameskip >= 0) // frameskip enabled
 702                 {
 703                         for (i = 0; i < currentConfig.Frameskip; i++) {
 704                                 updateKeys();
 705                                 SkipFrame(); frames_done++;
 706                                 if (PsndOut) { // do framelimitting if sound is enabled
 707                                         int tval_diff;
 708                                         tval = GetTickCount();
 709                                         tval_diff = (int)(tval - tval_thissec) << 8;
 710                                         if (tval_diff < lim_time) // we are too fast
 711                                                 simpleWait(tval + ((lim_time - tval_diff)>>8));
 712                                 }
 713                                 lim_time += target_frametime;
 714                         }
 715                 }
 716                 else // auto frameskip
 717                 {
 718                         int tval_diff;
 719                         tval = GetTickCount();
 720                         tval_diff = (int)(tval - tval_thissec) << 8;
 721                         if (tval_diff > lim_time)
 722                         {
 723                                 // no time left for this frame - skip
 724                                 if (tval_diff - lim_time >= (300<<8)) {
 725                                         /* something caused a slowdown for us (disk access? cache flush?)
 726                                          * try to recover by resetting timing... */
 727                                         reset_timing = 1;
 728                                         continue;
 729                                 }
 730                                 updateKeys();
 731                                 SkipFrame(); frames_done++;
 732                                 continue;
 733                         }
 734                 }
 735
 736                 updateKeys();
 737
 738                 if (giz_screen == NULL && (currentConfig.EmuOpt&0x80))
 739                         giz_screen = Framework2D_LockBuffer();
 740                 if (!(PicoOpt&0x10))
 741                         PicoScan((unsigned) -1, NULL);
 742
 743                 PicoFrame();
 744
 745                 if (currentConfig.EmuOpt&0x2000)
 746                         Framework2D_WaitVSync();
 747
 748                 if (giz_screen == NULL)
 749                         giz_screen = Framework2D_LockBuffer();
 750
 751                 blit(fpsbuff, notice);
 752
 753                 if (giz_screen != NULL) {
 754                         Framework2D_UnlockBuffer();
 755                         giz_screen = NULL;
 756                 }
 757
 758                 // check time
 759                 tval = GetTickCount();
 760                 tval_diff = (int)(tval - tval_thissec) << 8;
 761
 762                 if (currentConfig.Frameskip < 0 && tval_diff - lim_time >= (300<<8)) // slowdown detection
 763                         reset_timing = 1;
 764                 else if (PsndOut != NULL || currentConfig.Frameskip < 0)
 765                 {
 766                         // sleep if we are still too fast
 767                         if (tval_diff < lim_time)
 768                         {
 769                                 // we are too fast
 770                                 simpleWait(tval + ((lim_time - tval_diff) >> 8));
 771                         }
 772                 }
 773
 774                 frames_done++; frames_shown++;
 775         }
 776
 777
 778         if (PicoMCD & 1) PicoCDBufferFree();
 779
 780         if (PsndOut != NULL) {
 781                 PsndOut = snd_cbuff = NULL;
 782                 FrameworkAudio_Close();
 783         }
 784
 785         // save SRAM
 786         if ((currentConfig.EmuOpt & 1) && SRam.changed) {
 787                 emu_state_cb("Writing SRAM/BRAM..");
 788                 emu_SaveLoadGame(0, 1);
 789                 SRam.changed = 0;
 790         }
 791 }
 792
 793
 794 void emu_ResetGame(void)
 795 {
 796         PicoReset(0);
 797         reset_timing = 1;
 798 }
 799