main.c

   1 /* gameplaySP
   2  *
   3  * Copyright (C) 2006 Exophase <exophase@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of
   8  * the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include "common.h"
  21
  22 #ifdef PSP_BUILD
  23
  24 //PSP_MODULE_INFO("gpSP", 0x1000, 0, 6);
  25 //PSP_MAIN_THREAD_ATTR(THREAD_ATTR_USER);
  26
  27 void vblank_interrupt_handler(u32 sub, u32 *parg);
  28
  29 #endif
  30
  31 timer_type timer[4];
  32
  33 //debug_state current_debug_state = COUNTDOWN_BREAKPOINT;
  34 //debug_state current_debug_state = PC_BREAKPOINT;
  35 u32 breakpoint_value = 0x7c5000;
  36 debug_state current_debug_state = RUN;
  37 //debug_state current_debug_state = STEP_RUN;
  38
  39 //u32 breakpoint_value = 0;
  40
  41 frameskip_type current_frameskip_type = auto_frameskip;
  42 u32 global_cycles_per_instruction = 1;
  43 u32 random_skip = 0;
  44
  45 #ifdef GP2X_BUILD
  46 u32 frameskip_value = 2;
  47
  48 u64 frame_count_initial_timestamp = 0;
  49 u64 last_frame_interval_timestamp;
  50 u32 gp2x_fps_debug = 0;
  51
  52 void gp2x_init(void);
  53 void gp2x_quit(void);
  54 #else
  55
  56 u32 frameskip_value = 4;
  57 #endif
  58 u32 skip_next_frame = 0;
  59
  60 u32 frameskip_counter = 0;
  61
  62 u32 cpu_ticks = 0;
  63 u32 frame_ticks = 0;
  64
  65 u32 execute_cycles = 960;
  66 s32 video_count = 960;
  67 u32 ticks;
  68
  69 u32 arm_frame = 0;
  70 u32 thumb_frame = 0;
  71 u32 last_frame = 0;
  72
  73 u32 cycle_memory_access = 0;
  74 u32 cycle_pc_relative_access = 0;
  75 u32 cycle_sp_relative_access = 0;
  76 u32 cycle_block_memory_access = 0;
  77 u32 cycle_block_memory_sp_access = 0;
  78 u32 cycle_block_memory_words = 0;
  79 u32 cycle_dma16_words = 0;
  80 u32 cycle_dma32_words = 0;
  81 u32 flush_ram_count = 0;
  82 u32 gbc_update_count = 0;
  83 u32 oam_update_count = 0;
  84
  85 u32 synchronize_flag = 1;
  86
  87 u32 update_backup_flag = 1;
  88 #ifdef GP2X_BUILD
  89 u32 clock_speed = 200;
  90 #else
  91 u32 clock_speed = 333;
  92 #endif
  93 u8 main_path[512];
  94
  95 void trigger_ext_event();
  96
  97 #define check_count(count_var)                                                \
  98   if(count_var < execute_cycles)                                              \
  99     execute_cycles = count_var;                                               \
 100
 101 #define check_timer(timer_number)                                             \
 102   if(timer[timer_number].status == TIMER_PRESCALE)                            \
 103     check_count(timer[timer_number].count);                                   \
 104
 105 #define update_timer(timer_number)                                            \
 106   if(timer[timer_number].status != TIMER_INACTIVE)                            \
 107   {                                                                           \
 108     if(timer[timer_number].status != TIMER_CASCADE)                           \
 109     {                                                                         \
 110       timer[timer_number].count -= execute_cycles;                            \
 111       io_registers[REG_TM##timer_number##D] =                                 \
 112        -(timer[timer_number].count >> timer[timer_number].prescale);          \
 113     }                                                                         \
 114                                                                               \
 115     if(timer[timer_number].count <= 0)                                        \
 116     {                                                                         \
 117       if(timer[timer_number].irq == TIMER_TRIGGER_IRQ)                        \
 118         irq_raised |= IRQ_TIMER##timer_number;                                \
 119                                                                               \
 120       if((timer_number != 3) &&                                               \
 121        (timer[timer_number + 1].status == TIMER_CASCADE))                     \
 122       {                                                                       \
 123         timer[timer_number + 1].count--;                                      \
 124         io_registers[REG_TM0D + (timer_number + 1) * 2] =                     \
 125          -(timer[timer_number + 1].count);                                    \
 126       }                                                                       \
 127                                                                               \
 128       if(timer_number < 2)                                                    \
 129       {                                                                       \
 130         if(timer[timer_number].direct_sound_channels & 0x01)                  \
 131           sound_timer(timer[timer_number].frequency_step, 0);                 \
 132                                                                               \
 133         if(timer[timer_number].direct_sound_channels & 0x02)                  \
 134           sound_timer(timer[timer_number].frequency_step, 1);                 \
 135       }                                                                       \
 136                                                                               \
 137       timer[timer_number].count +=                                            \
 138        (timer[timer_number].reload << timer[timer_number].prescale);          \
 139     }                                                                         \
 140   }                                                                           \
 141
 142 u8 *file_ext[] = { ".gba", ".bin", ".zip", NULL };
 143
 144 #ifdef ARM_ARCH
 145 void ChangeWorkingDirectory(char *exe)
 146 {
 147 #ifndef _WIN32_WCE
 148   char *s = strrchr(exe, '/');
 149   if (s != NULL) {
 150     *s = '\0';
 151     chdir(exe);
 152     *s = '/';
 153   }
 154 #endif
 155 }
 156 #endif
 157
 158 void init_main()
 159 {
 160   u32 i;
 161
 162   skip_next_frame = 0;
 163
 164   for(i = 0; i < 4; i++)
 165   {
 166     dma[i].start_type = DMA_INACTIVE;
 167     dma[i].direct_sound_channel = DMA_NO_DIRECT_SOUND;
 168     timer[i].status = TIMER_INACTIVE;
 169     timer[i].reload = 0x10000;
 170     timer[i].stop_cpu_ticks = 0;
 171   }
 172
 173   timer[0].direct_sound_channels = TIMER_DS_CHANNEL_BOTH;
 174   timer[1].direct_sound_channels = TIMER_DS_CHANNEL_NONE;
 175
 176   cpu_ticks = 0;
 177   frame_ticks = 0;
 178
 179   execute_cycles = 960;
 180   video_count = 960;
 181
 182   flush_translation_cache_rom();
 183   flush_translation_cache_ram();
 184   flush_translation_cache_bios();
 185 }
 186
 187 int main(int argc, char *argv[])
 188 {
 189   u32 i;
 190   u32 vcount = 0;
 191   u32 ticks;
 192   u32 dispstat;
 193   u8 load_filename[512];
 194   u8 bios_filename[512];
 195
 196 #ifdef PSP_BUILD
 197   sceKernelRegisterSubIntrHandler(PSP_VBLANK_INT, 0,
 198    vblank_interrupt_handler, NULL);
 199   sceKernelEnableSubIntr(PSP_VBLANK_INT, 0);
 200 #elif !defined(GP2X_BUILD)
 201   freopen("CON", "wb", stdout);
 202 #endif
 203
 204   extern char *cpu_mode_names[];
 205
 206   init_gamepak_buffer();
 207
 208   // Copy the directory path of the executable into main_path
 209
 210 #ifdef ARM_ARCH
 211   // ChangeWorkingDirectory will null out the filename out of the path
 212   ChangeWorkingDirectory(argv[0]);
 213 #endif
 214
 215   getcwd(main_path, 512);
 216   load_config_file();
 217
 218   gamepak_filename[0] = 0;
 219
 220 #ifdef PSP_BUILD
 221   delay_us(2500000);
 222 #endif
 223
 224 #ifdef GP2X_BUILD
 225   // Overclocking GP2X and MMU patch goes here
 226   gp2x_init();
 227 #endif
 228
 229   init_video();
 230
 231 #ifdef GP2X_BUILD
 232   sprintf(bios_filename, "%s/%s", main_path, "gba_bios.bin");
 233   if(load_bios(bios_filename) == -1)
 234 #else
 235   if(load_bios("gba_bios.bin") == -1)
 236 #endif
 237   {
 238     gui_action_type gui_action = CURSOR_NONE;
 239
 240     debug_screen_start();
 241     debug_screen_printl("Sorry, but gpSP requires a Gameboy Advance BIOS   ");
 242     debug_screen_printl("image to run correctly. Make sure to get an       ");
 243     debug_screen_printl("authentic one, it'll be exactly 16384 bytes large ");
 244     debug_screen_printl("and should have the following md5sum value:       ");
 245     debug_screen_printl("                                                  ");
 246     debug_screen_printl("a860e8c0b6d573d191e4ec7db1b1e4f6                  ");
 247     debug_screen_printl("                                                  ");
 248     debug_screen_printl("When you do get it name it gba_bios.bin and put it");
 249     debug_screen_printl("in the same directory as gpSP.                    ");
 250     debug_screen_printl("                                                  ");
 251     debug_screen_printl("Press any button to exit.                         ");
 252
 253     debug_screen_update();
 254
 255     while(gui_action == CURSOR_NONE)
 256     {
 257       gui_action = get_gui_input();
 258       delay_us(15000);
 259     }
 260
 261     debug_screen_end();
 262
 263     quit();
 264   }
 265
 266   if(bios_rom[0] != 0x18)
 267   {
 268     gui_action_type gui_action = CURSOR_NONE;
 269
 270     debug_screen_start();
 271     debug_screen_printl("You have an incorrect BIOS image.                 ");
 272     debug_screen_printl("While many games will work fine, some will not. It");
 273     debug_screen_printl("is strongly recommended that you obtain the       ");
 274     debug_screen_printl("correct BIOS file. Do NOT report any bugs if you  ");
 275     debug_screen_printl("are seeing this message.                          ");
 276     debug_screen_printl("                                                  ");
 277     debug_screen_printl("Press any button to resume, at your own risk.     ");
 278
 279     debug_screen_update();
 280
 281     while(gui_action == CURSOR_NONE)
 282     {
 283       gui_action = get_gui_input();
 284       delay_us(15000);
 285     }
 286
 287     debug_screen_end();
 288   }
 289
 290   init_main();
 291   init_sound();
 292
 293   init_input();
 294
 295   video_resolution_large();
 296
 297   if(argc > 1)
 298   {
 299     if(load_gamepak(argv[1]) == -1)
 300     {
 301 #ifdef PC_BUILD
 302       printf("Failed to load gamepak %s, exiting.\n", load_filename);
 303 #endif
 304       exit(-1);
 305     }
 306
 307     set_gba_resolution(screen_scale);
 308     video_resolution_small();
 309
 310     init_cpu();
 311     init_memory();
 312   }
 313   else
 314   {
 315     if(load_file(file_ext, load_filename) == -1)
 316     {
 317       menu(copy_screen());
 318     }
 319     else
 320     {
 321       if(load_gamepak(load_filename) == -1)
 322       {
 323 #ifdef PC_BUILD
 324         printf("Failed to load gamepak %s, exiting.\n", load_filename);
 325 #endif
 326         exit(-1);
 327       }
 328
 329       set_gba_resolution(screen_scale);
 330       video_resolution_small();
 331
 332       init_cpu();
 333       init_memory();
 334     }
 335   }
 336
 337   last_frame = 0;
 338
 339   // We'll never actually return from here.
 340
 341 #ifdef PSP_BUILD
 342   execute_arm_translate(execute_cycles);
 343 #else
 344
 345 #ifdef GP2X_BUILD
 346   get_ticks_us(&frame_count_initial_timestamp);
 347 #endif
 348
 349 /*  u8 current_savestate_filename[512];
 350   get_savestate_filename_noshot(savestate_slot,
 351    current_savestate_filename);
 352   load_state(current_savestate_filename); */
 353
 354 //  debug_on();
 355
 356   if(argc > 2)
 357   {
 358     current_debug_state = COUNTDOWN_BREAKPOINT;
 359     breakpoint_value = strtol(argv[2], NULL, 16);
 360   }
 361
 362   trigger_ext_event();
 363
 364   execute_arm_translate(execute_cycles);
 365   execute_arm(execute_cycles);
 366 #endif
 367   return 0;
 368 }
 369
 370 void print_memory_stats(u32 *counter, u32 *region_stats, char *stats_str)
 371 {
 372   u32 other_region_counter = region_stats[0x1] + region_stats[0xE] +
 373    region_stats[0xF];
 374   u32 rom_region_counter = region_stats[0x8] + region_stats[0x9] +
 375    region_stats[0xA] + region_stats[0xB] + region_stats[0xC] +
 376    region_stats[0xD];
 377   u32 _counter = *counter;
 378
 379   printf("memory access stats: %s (out of %d)\n", stats_str, _counter);
 380   printf("bios: %f%%\tiwram: %f%%\tewram: %f%%\tvram: %f\n",
 381    region_stats[0x0] * 100.0 / _counter, region_stats[0x3] * 100.0 /
 382    _counter,
 383    region_stats[0x2] * 100.0 / _counter, region_stats[0x6] * 100.0 /
 384    _counter);
 385
 386   printf("oam: %f%%\tpalette: %f%%\trom: %f%%\tother: %f%%\n",
 387    region_stats[0x7] * 100.0 / _counter, region_stats[0x5] * 100.0 /
 388    _counter,
 389    rom_region_counter * 100.0 / _counter, other_region_counter * 100.0 /
 390    _counter);
 391
 392   *counter = 0;
 393   memset(region_stats, 0, sizeof(u32) * 16);
 394 }
 395
 396 u32 event_cycles = 0;
 397 const u32 event_cycles_trigger = 60 * 5;
 398 u32 no_alpha = 0;
 399
 400 void trigger_ext_event()
 401 {
 402   static u32 event_number = 0;
 403   static u64 benchmark_ticks[16];
 404   u64 new_ticks;
 405   u8 current_savestate_filename[512];
 406
 407   return;
 408
 409   if(event_number)
 410   {
 411     get_ticks_us(&new_ticks);
 412     benchmark_ticks[event_number - 1] =
 413      new_ticks - benchmark_ticks[event_number - 1];
 414   }
 415
 416   current_frameskip_type = no_frameskip;
 417   no_alpha = 0;
 418   synchronize_flag = 0;
 419
 420   get_savestate_filename_noshot(savestate_slot,
 421    current_savestate_filename);
 422   load_state(current_savestate_filename);
 423
 424   switch(event_number)
 425   {
 426     case 0:
 427       // Full benchmark, run normally
 428       break;
 429
 430     case 1:
 431       // No alpha blending
 432       no_alpha = 1;
 433       break;
 434
 435     case 2:
 436       // No video benchmark
 437       // Set frameskip really high + manual
 438       current_frameskip_type = manual_frameskip;
 439       frameskip_value = 1000000;
 440       break;
 441
 442     case 3:
 443       // No CPU benchmark
 444       // Put CPU in halt mode, put it in IRQ mode with interrupts off
 445       reg[CPU_HALT_STATE] = CPU_HALT;
 446       reg[REG_CPSR] = 0xD2;
 447       break;
 448
 449     case 4:
 450       // No CPU or video benchmark
 451       reg[CPU_HALT_STATE] = CPU_HALT;
 452       reg[REG_CPSR] = 0xD2;
 453       current_frameskip_type = manual_frameskip;
 454       frameskip_value = 1000000;
 455       break;
 456
 457     case 5:
 458     {
 459       // Done
 460       char *print_strings[] =
 461       {
 462         "Full test   ",
 463         "No blending ",
 464         "No video    ",
 465         "No CPU      ",
 466         "No CPU/video",
 467         "CPU speed   ",
 468         "Video speed ",
 469         "Alpha cost  "
 470       };
 471       u32 i;
 472
 473       benchmark_ticks[6] = benchmark_ticks[0] - benchmark_ticks[2];
 474       benchmark_ticks[5] = benchmark_ticks[0] - benchmark_ticks[4] -
 475        benchmark_ticks[6];
 476       benchmark_ticks[7] = benchmark_ticks[0] - benchmark_ticks[1];
 477
 478       printf("Benchmark results (%d frames): \n", event_cycles_trigger);
 479       for(i = 0; i < 8; i++)
 480       {
 481         printf("   %s: %d ms (%f ms per frame)\n",
 482          print_strings[i], (u32)benchmark_ticks[i] / 1000,
 483          (float)(benchmark_ticks[i] / (1000.0 * event_cycles_trigger)));
 484         if(i == 4)
 485           printf("\n");
 486       }
 487       quit();
 488     }
 489   }
 490
 491   event_cycles = 0;
 492
 493   get_ticks_us(benchmark_ticks + event_number);
 494   event_number++;
 495 }
 496
 497 static u32 fps = 60;
 498 static u32 frames_drawn = 60;
 499
 500 u32 update_gba()
 501 {
 502   irq_type irq_raised = IRQ_NONE;
 503
 504   do
 505   {
 506     cpu_ticks += execute_cycles;
 507
 508     reg[CHANGED_PC_STATUS] = 0;
 509
 510     if(gbc_sound_update)
 511     {
 512       gbc_update_count++;
 513       update_gbc_sound(cpu_ticks);
 514       gbc_sound_update = 0;
 515     }
 516
 517     update_timer(0);
 518     update_timer(1);
 519     update_timer(2);
 520     update_timer(3);
 521
 522     video_count -= execute_cycles;
 523
 524     if(video_count <= 0)
 525     {
 526       u32 vcount = io_registers[REG_VCOUNT];
 527       u32 dispstat = io_registers[REG_DISPSTAT];
 528
 529       if((dispstat & 0x02) == 0)
 530       {
 531         // Transition from hrefresh to hblank
 532         video_count += (272);
 533         dispstat |= 0x02;
 534
 535         if((dispstat & 0x01) == 0)
 536         {
 537           u32 i;
 538           if(oam_update)
 539             oam_update_count++;
 540
 541           if(no_alpha)
 542             io_registers[REG_BLDCNT] = 0;
 543           update_scanline();
 544
 545           // If in visible area also fire HDMA
 546           for(i = 0; i < 4; i++)
 547           {
 548             if(dma[i].start_type == DMA_START_HBLANK)
 549               dma_transfer(dma + i);
 550           }
 551         }
 552
 553         if(dispstat & 0x10)
 554           irq_raised |= IRQ_HBLANK;
 555       }
 556       else
 557       {
 558         // Transition from hblank to next line
 559         video_count += 960;
 560         dispstat &= ~0x02;
 561
 562         vcount++;
 563
 564         if(vcount == 160)
 565         {
 566           // Transition from vrefresh to vblank
 567           u32 i;
 568
 569           dispstat |= 0x01;
 570           if(dispstat & 0x8)
 571           {
 572             irq_raised |= IRQ_VBLANK;
 573           }
 574
 575           affine_reference_x[0] =
 576            (s32)(address32(io_registers, 0x28) << 4) >> 4;
 577           affine_reference_y[0] =
 578            (s32)(address32(io_registers, 0x2C) << 4) >> 4;
 579           affine_reference_x[1] =
 580            (s32)(address32(io_registers, 0x38) << 4) >> 4;
 581           affine_reference_y[1] =
 582            (s32)(address32(io_registers, 0x3C) << 4) >> 4;
 583
 584           for(i = 0; i < 4; i++)
 585           {
 586             if(dma[i].start_type == DMA_START_VBLANK)
 587               dma_transfer(dma + i);
 588           }
 589         }
 590         else
 591
 592         if(vcount == 228)
 593         {
 594           // Transition from vblank to next screen
 595           dispstat &= ~0x01;
 596           frame_ticks++;
 597
 598   #ifdef PC_BUILD
 599         printf("frame update (%x), %d instructions total, %d RAM flushes\n",
 600            reg[REG_PC], instruction_count - last_frame, flush_ram_count);
 601           last_frame = instruction_count;
 602
 603 /*          printf("%d gbc audio updates\n", gbc_update_count);
 604           printf("%d oam updates\n", oam_update_count); */
 605           gbc_update_count = 0;
 606           oam_update_count = 0;
 607           flush_ram_count = 0;
 608   #endif
 609
 610           if(update_input())
 611             continue;
 612
 613           update_gbc_sound(cpu_ticks);
 614
 615           if(gp2x_fps_debug)
 616           {
 617             char print_buffer[32];
 618             sprintf(print_buffer, "%d (%d)", fps, frames_drawn);
 619             print_string(print_buffer, 0xFFFF, 0x000, 0, 0);
 620           }
 621
 622           update_screen();
 623
 624           synchronize();
 625
 626           if(update_backup_flag)
 627             update_backup();
 628
 629           process_cheats();
 630
 631           event_cycles++;
 632           if(event_cycles == event_cycles_trigger)
 633           {
 634             trigger_ext_event();
 635             continue;
 636           }
 637
 638           vcount = 0;
 639         }
 640
 641         if(vcount == (dispstat >> 8))
 642         {
 643           // vcount trigger
 644           dispstat |= 0x04;
 645           if(dispstat & 0x20)
 646           {
 647             irq_raised |= IRQ_VCOUNT;
 648           }
 649         }
 650         else
 651         {
 652           dispstat &= ~0x04;
 653         }
 654
 655         io_registers[REG_VCOUNT] = vcount;
 656       }
 657       io_registers[REG_DISPSTAT] = dispstat;
 658     }
 659
 660     if(irq_raised)
 661       raise_interrupt(irq_raised);
 662
 663     execute_cycles = video_count;
 664
 665     check_timer(0);
 666     check_timer(1);
 667     check_timer(2);
 668     check_timer(3);
 669   } while(reg[CPU_HALT_STATE] != CPU_ACTIVE);
 670
 671   return execute_cycles;
 672 }
 673
 674 u64 last_screen_timestamp = 0;
 675 u32 frame_speed = 15000;
 676
 677
 678 #ifdef PSP_BUILD
 679
 680 u32 real_frame_count = 0;
 681 u32 virtual_frame_count = 0;
 682 u32 num_skipped_frames = 0;
 683
 684 void vblank_interrupt_handler(u32 sub, u32 *parg)
 685 {
 686   real_frame_count++;
 687 }
 688
 689 void synchronize()
 690 {
 691   char char_buffer[64];
 692   u64 new_ticks, time_delta;
 693   s32 used_frameskip = frameskip_value;
 694
 695   if(!synchronize_flag)
 696   {
 697     print_string("--FF--", 0xFFFF, 0x000, 0, 0);
 698     used_frameskip = 4;
 699     virtual_frame_count = real_frame_count - 1;
 700   }
 701
 702   skip_next_frame = 0;
 703
 704   virtual_frame_count++;
 705
 706   if(real_frame_count >= virtual_frame_count)
 707   {
 708     if((real_frame_count > virtual_frame_count) &&
 709      (current_frameskip_type == auto_frameskip) &&
 710      (num_skipped_frames < frameskip_value))
 711     {
 712       skip_next_frame = 1;
 713       num_skipped_frames++;
 714     }
 715     else
 716     {
 717       virtual_frame_count = real_frame_count;
 718       num_skipped_frames = 0;
 719     }
 720
 721     // Here so that the home button return will eventually work.
 722     // If it's not running fullspeed anyway this won't really hurt
 723     // it much more.
 724
 725     delay_us(1);
 726   }
 727   else
 728   {
 729     if(synchronize_flag)
 730       sceDisplayWaitVblankStart();
 731   }
 732
 733   if(current_frameskip_type == manual_frameskip)
 734   {
 735     frameskip_counter = (frameskip_counter + 1) %
 736      (used_frameskip + 1);
 737     if(random_skip)
 738     {
 739       if(frameskip_counter != (rand() % (used_frameskip + 1)))
 740         skip_next_frame = 1;
 741     }
 742     else
 743     {
 744       if(frameskip_counter)
 745         skip_next_frame = 1;
 746     }
 747   }
 748
 749 /*  sprintf(char_buffer, "%08d %08d %d %d %d\n",
 750    real_frame_count, virtual_frame_count, num_skipped_frames,
 751    real_frame_count - virtual_frame_count, skip_next_frame);
 752   print_string(char_buffer, 0xFFFF, 0x0000, 0, 10); */
 753
 754 /*
 755     sprintf(char_buffer, "%02d %02d %06d %07d", frameskip, (u32)ms_needed,
 756      ram_translation_ptr - ram_translation_cache, rom_translation_ptr -
 757      rom_translation_cache);
 758     print_string(char_buffer, 0xFFFF, 0x0000, 0, 0);
 759 */
 760 }
 761
 762 #endif
 763
 764 #ifdef GP2X_BUILD
 765
 766 u32 real_frame_count = 0;
 767 u32 virtual_frame_count = 0;
 768 u32 num_skipped_frames = 0;
 769 u32 interval_skipped_frames;
 770 u32 frames;
 771
 772 const u32 frame_interval = 60;
 773
 774 void synchronize()
 775 {
 776   u64 new_ticks;
 777   u64 time_delta;
 778
 779   get_ticks_us(&new_ticks);
 780   time_delta = new_ticks - last_screen_timestamp;
 781   last_screen_timestamp = new_ticks;
 782
 783   skip_next_frame = 0;
 784   virtual_frame_count++;
 785
 786   real_frame_count = ((new_ticks -
 787     frame_count_initial_timestamp) * 3) / 50000;
 788
 789   if(real_frame_count >= virtual_frame_count)
 790   {
 791     if((real_frame_count > virtual_frame_count) &&
 792      (current_frameskip_type == auto_frameskip) &&
 793      (num_skipped_frames < frameskip_value))
 794     {
 795       skip_next_frame = 1;
 796       num_skipped_frames++;
 797     }
 798     else
 799     {
 800       virtual_frame_count = real_frame_count;
 801       num_skipped_frames = 0;
 802     }
 803   }
 804
 805   frames++;
 806
 807   if(frames == frame_interval)
 808   {
 809     u32 new_fps;
 810     u32 new_frames_drawn;
 811
 812     time_delta = new_ticks - last_frame_interval_timestamp;
 813     new_fps = (u64)((u64)1000000 * (u64)frame_interval) / time_delta;
 814     new_frames_drawn =
 815      (frame_interval - interval_skipped_frames) * (60 / frame_interval);
 816
 817     // Left open for rolling averages
 818     fps = new_fps;
 819     frames_drawn = new_frames_drawn;
 820
 821     last_frame_interval_timestamp = new_ticks;
 822     interval_skipped_frames = 0;
 823     frames = 0;
 824   }
 825
 826   if(current_frameskip_type == manual_frameskip)
 827   {
 828     frameskip_counter = (frameskip_counter + 1) %
 829      (frameskip_value + 1);
 830     if(random_skip)
 831     {
 832       if(frameskip_counter != (rand() % (frameskip_value + 1)))
 833         skip_next_frame = 1;
 834     }
 835     else
 836     {
 837       if(frameskip_counter)
 838         skip_next_frame = 1;
 839     }
 840   }
 841
 842   interval_skipped_frames += skip_next_frame;
 843
 844   if(!synchronize_flag)
 845     print_string("--FF--", 0xFFFF, 0x000, 0, 0);
 846 }
 847
 848 #endif
 849
 850
 851 #ifdef PC_BUILD
 852
 853 u32 ticks_needed_total = 0;
 854 float us_needed = 0.0;
 855 u32 frames = 0;
 856 const u32 frame_interval = 60;
 857
 858 void synchronize()
 859 {
 860   u64 new_ticks;
 861   u64 time_delta;
 862   char char_buffer[64];
 863
 864   get_ticks_us(&new_ticks);
 865   time_delta = new_ticks - last_screen_timestamp;
 866   last_screen_timestamp = new_ticks;
 867   ticks_needed_total += time_delta;
 868
 869   skip_next_frame = 0;
 870
 871   if((time_delta < frame_speed) && synchronize_flag)
 872   {
 873     delay_us(frame_speed - time_delta);
 874   }
 875
 876   frames++;
 877
 878   if(frames == frame_interval)
 879   {
 880     us_needed = (float)ticks_needed_total / frame_interval;
 881     ticks_needed_total = 0;
 882     frames = 0;
 883   }
 884
 885   if(current_frameskip_type == manual_frameskip)
 886   {
 887     frameskip_counter = (frameskip_counter + 1) %
 888      (frameskip_value + 1);
 889     if(random_skip)
 890     {
 891       if(frameskip_counter != (rand() % (frameskip_value + 1)))
 892         skip_next_frame = 1;
 893     }
 894     else
 895     {
 896       if(frameskip_counter)
 897         skip_next_frame = 1;
 898     }
 899   }
 900
 901   if(synchronize_flag == 0)
 902     print_string("--FF--", 0xFFFF, 0x000, 0, 0);
 903
 904   sprintf(char_buffer, "gpSP: %.1fms %.1ffps", us_needed / 1000.0,
 905    1000000.0 / us_needed);
 906   SDL_WM_SetCaption(char_buffer, "gpSP");
 907
 908 /*
 909     sprintf(char_buffer, "%02d %02d %06d %07d", frameskip, (u32)ms_needed,
 910      ram_translation_ptr - ram_translation_cache, rom_translation_ptr -
 911      rom_translation_cache);
 912     print_string(char_buffer, 0xFFFF, 0x0000, 0, 0);
 913 */
 914 }
 915
 916 #endif
 917
 918 void quit()
 919 {
 920   if(!update_backup_flag)
 921     update_backup_force();
 922
 923   sound_exit();
 924
 925 #ifdef REGISTER_USAGE_ANALYZE
 926   print_register_usage();
 927 #endif
 928
 929 #ifdef PSP_BUILD
 930   sceKernelExitGame();
 931 #else
 932   SDL_Quit();
 933
 934 #ifdef GP2X_BUILD
 935   gp2x_quit();
 936 #endif
 937
 938   exit(0);
 939 #endif
 940 }
 941
 942 void reset_gba()
 943 {
 944   init_main();
 945   init_memory();
 946   init_cpu();
 947   reset_sound();
 948 }
 949
 950 #ifdef PSP_BUILD
 951
 952 u32 file_length(u8 *filename, s32 dummy)
 953 {
 954   SceIoStat stats;
 955   sceIoGetstat(filename, &stats);
 956   return stats.st_size;
 957 }
 958
 959 void delay_us(u32 us_count)
 960 {
 961   sceKernelDelayThread(us_count);
 962 }
 963
 964 void get_ticks_us(u64 *tick_return)
 965 {
 966   u64 ticks;
 967   sceRtcGetCurrentTick(&ticks);
 968
 969   *tick_return = (ticks * 1000000) / sceRtcGetTickResolution();
 970 }
 971
 972 #else
 973
 974 u32 file_length(u8 *dummy, FILE *fp)
 975 {
 976   u32 length;
 977
 978   fseek(fp, 0, SEEK_END);
 979   length = ftell(fp);
 980   fseek(fp, 0, SEEK_SET);
 981
 982   return length;
 983 }
 984
 985 #ifdef PC_BUILD
 986
 987 void delay_us(u32 us_count)
 988 {
 989   SDL_Delay(us_count / 1000);
 990 }
 991
 992 void get_ticks_us(u64 *ticks_return)
 993 {
 994   *ticks_return = (SDL_GetTicks() * 1000);
 995 }
 996
 997 #else
 998
 999 void delay_us(u32 us_count)
1000 {
1001   //usleep(us_count);
1002   SDL_Delay(us_count / 1000);
1003 }
1004
1005 void get_ticks_us(u64 *ticks_return)
1006 {
1007   struct timeval current_time;
1008   gettimeofday(&current_time, NULL);
1009
1010   *ticks_return =
1011    (u64)current_time.tv_sec * 1000000 + current_time.tv_usec;
1012 }
1013
1014 #endif
1015
1016 #endif
1017
1018 void change_ext(u8 *src, u8 *buffer, u8 *extension)
1019 {
1020   u8 *dot_position;
1021   strcpy(buffer, src);
1022   dot_position = strrchr(buffer, '.');
1023
1024   if(dot_position)
1025     strcpy(dot_position, extension);
1026 }
1027
1028 #define main_savestate_builder(type)                                          \
1029 void main_##type##_savestate(file_tag_type savestate_file)                    \
1030 {                                                                             \
1031   file_##type##_variable(savestate_file, cpu_ticks);                          \
1032   file_##type##_variable(savestate_file, execute_cycles);                     \
1033   file_##type##_variable(savestate_file, video_count);                        \
1034   file_##type##_array(savestate_file, timer);                                 \
1035 }                                                                             \
1036
1037 main_savestate_builder(read);
1038 main_savestate_builder(write_mem);
1039
1040
1041 void printout(void *str, u32 val)
1042 {
1043   printf(str, val);
1044 }