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 u32 fps_debug = 0;
  45
  46 #ifdef GP2X_BUILD
  47 u32 frameskip_value = 2;
  48
  49 u64 frame_count_initial_timestamp = 0;
  50 u64 last_frame_interval_timestamp;
  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 #endif
 201
 202   extern char *cpu_mode_names[];
 203
 204   init_gamepak_buffer();
 205
 206   // Copy the directory path of the executable into main_path
 207
 208 #ifdef ARM_ARCH
 209   // ChangeWorkingDirectory will null out the filename out of the path
 210   ChangeWorkingDirectory(argv[0]);
 211 #endif
 212
 213   getcwd(main_path, 512);
 214   load_config_file();
 215
 216   gamepak_filename[0] = 0;
 217
 218 #ifdef PSP_BUILD
 219   delay_us(2500000);
 220 #endif
 221
 222 #ifdef GP2X_BUILD
 223   // Overclocking GP2X and MMU patch goes here
 224   gp2x_init();
 225 #endif
 226
 227   init_video();
 228
 229 #ifdef GP2X_BUILD
 230   sprintf(bios_filename, "%s/%s", main_path, "gba_bios.bin");
 231   if(load_bios(bios_filename) == -1)
 232 #else
 233   if(load_bios("gba_bios.bin") == -1)
 234 #endif
 235   {
 236     gui_action_type gui_action = CURSOR_NONE;
 237
 238     debug_screen_start();
 239     debug_screen_printl("Sorry, but gpSP requires a Gameboy Advance BIOS   ");
 240     debug_screen_printl("image to run correctly. Make sure to get an       ");
 241     debug_screen_printl("authentic one, it'll be exactly 16384 bytes large ");
 242     debug_screen_printl("and should have the following md5sum value:       ");
 243     debug_screen_printl("                                                  ");
 244     debug_screen_printl("a860e8c0b6d573d191e4ec7db1b1e4f6                  ");
 245     debug_screen_printl("                                                  ");
 246     debug_screen_printl("When you do get it name it gba_bios.bin and put it");
 247     debug_screen_printl("in the same directory as gpSP.                    ");
 248     debug_screen_printl("                                                  ");
 249     debug_screen_printl("Press any button to exit.                         ");
 250
 251     debug_screen_update();
 252
 253     while(gui_action == CURSOR_NONE)
 254     {
 255       gui_action = get_gui_input();
 256       delay_us(15000);
 257     }
 258
 259     debug_screen_end();
 260
 261     quit();
 262   }
 263
 264   if(bios_rom[0] != 0x18)
 265   {
 266     gui_action_type gui_action = CURSOR_NONE;
 267
 268     debug_screen_start();
 269     debug_screen_printl("You have an incorrect BIOS image.                 ");
 270     debug_screen_printl("While many games will work fine, some will not. It");
 271     debug_screen_printl("is strongly recommended that you obtain the       ");
 272     debug_screen_printl("correct BIOS file. Do NOT report any bugs if you  ");
 273     debug_screen_printl("are seeing this message.                          ");
 274     debug_screen_printl("                                                  ");
 275     debug_screen_printl("Press any button to resume, at your own risk.     ");
 276
 277     debug_screen_update();
 278
 279     while(gui_action == CURSOR_NONE)
 280     {
 281       gui_action = get_gui_input();
 282       delay_us(15000);
 283     }
 284
 285     debug_screen_end();
 286   }
 287
 288   init_main();
 289   init_sound();
 290
 291   init_input();
 292
 293   video_resolution_large();
 294
 295   if(argc > 1)
 296   {
 297     if(load_gamepak(argv[1]) == -1)
 298     {
 299 #ifdef PC_BUILD
 300       printf("Failed to load gamepak %s, exiting.\n", load_filename);
 301 #endif
 302       exit(-1);
 303     }
 304
 305     set_gba_resolution(screen_scale);
 306     video_resolution_small();
 307
 308     init_cpu();
 309     init_memory();
 310   }
 311   else
 312   {
 313     if(load_file(file_ext, load_filename) == -1)
 314     {
 315       menu(copy_screen());
 316     }
 317     else
 318     {
 319       if(load_gamepak(load_filename) == -1)
 320       {
 321 #ifdef PC_BUILD
 322         printf("Failed to load gamepak %s, exiting.\n", load_filename);
 323 #endif
 324         exit(-1);
 325       }
 326
 327       set_clock_speed();
 328       set_gba_resolution(screen_scale);
 329       video_resolution_small();
 330
 331       init_cpu();
 332       init_memory();
 333     }
 334   }
 335
 336   last_frame = 0;
 337
 338   // We'll never actually return from here.
 339
 340 #ifdef PSP_BUILD
 341   execute_arm_translate(execute_cycles);
 342 #else
 343
 344 #ifdef GP2X_BUILD
 345   get_ticks_us(&frame_count_initial_timestamp);
 346 #endif
 347
 348 /*  u8 current_savestate_filename[512];
 349   get_savestate_filename_noshot(savestate_slot,
 350    current_savestate_filename);
 351   load_state(current_savestate_filename); */
 352
 353 //  debug_on();
 354
 355   if(argc > 2)
 356   {
 357     current_debug_state = COUNTDOWN_BREAKPOINT;
 358     breakpoint_value = strtol(argv[2], NULL, 16);
 359   }
 360
 361   trigger_ext_event();
 362
 363   execute_arm_translate(execute_cycles);
 364   execute_arm(execute_cycles);
 365 #endif
 366   return 0;
 367 }
 368
 369 void print_memory_stats(u32 *counter, u32 *region_stats, char *stats_str)
 370 {
 371   u32 other_region_counter = region_stats[0x1] + region_stats[0xE] +
 372    region_stats[0xF];
 373   u32 rom_region_counter = region_stats[0x8] + region_stats[0x9] +
 374    region_stats[0xA] + region_stats[0xB] + region_stats[0xC] +
 375    region_stats[0xD];
 376   u32 _counter = *counter;
 377
 378   printf("memory access stats: %s (out of %d)\n", stats_str, _counter);
 379   printf("bios: %f%%\tiwram: %f%%\tewram: %f%%\tvram: %f\n",
 380    region_stats[0x0] * 100.0 / _counter, region_stats[0x3] * 100.0 /
 381    _counter,
 382    region_stats[0x2] * 100.0 / _counter, region_stats[0x6] * 100.0 /
 383    _counter);
 384
 385   printf("oam: %f%%\tpalette: %f%%\trom: %f%%\tother: %f%%\n",
 386    region_stats[0x7] * 100.0 / _counter, region_stats[0x5] * 100.0 /
 387    _counter,
 388    rom_region_counter * 100.0 / _counter, other_region_counter * 100.0 /
 389    _counter);
 390
 391   *counter = 0;
 392   memset(region_stats, 0, sizeof(u32) * 16);
 393 }
 394
 395 u32 event_cycles = 0;
 396 const u32 event_cycles_trigger = 60 * 5;
 397 u32 no_alpha = 0;
 398
 399 void trigger_ext_event()
 400 {
 401   static u32 event_number = 0;
 402   static u64 benchmark_ticks[16];
 403   u64 new_ticks;
 404   u8 current_savestate_filename[512];
 405
 406   return;
 407
 408   if(event_number)
 409   {
 410     get_ticks_us(&new_ticks);
 411     benchmark_ticks[event_number - 1] =
 412      new_ticks - benchmark_ticks[event_number - 1];
 413   }
 414
 415   current_frameskip_type = no_frameskip;
 416   no_alpha = 0;
 417   synchronize_flag = 0;
 418
 419   get_savestate_filename_noshot(savestate_slot,
 420    current_savestate_filename);
 421   load_state(current_savestate_filename);
 422
 423   switch(event_number)
 424   {
 425     case 0:
 426       // Full benchmark, run normally
 427       break;
 428
 429     case 1:
 430       // No alpha blending
 431       no_alpha = 1;
 432       break;
 433
 434     case 2:
 435       // No video benchmark
 436       // Set frameskip really high + manual
 437       current_frameskip_type = manual_frameskip;
 438       frameskip_value = 1000000;
 439       break;
 440
 441     case 3:
 442       // No CPU benchmark
 443       // Put CPU in halt mode, put it in IRQ mode with interrupts off
 444       reg[CPU_HALT_STATE] = CPU_HALT;
 445       reg[REG_CPSR] = 0xD2;
 446       break;
 447
 448     case 4:
 449       // No CPU or video benchmark
 450       reg[CPU_HALT_STATE] = CPU_HALT;
 451       reg[REG_CPSR] = 0xD2;
 452       current_frameskip_type = manual_frameskip;
 453       frameskip_value = 1000000;
 454       break;
 455
 456     case 5:
 457     {
 458       // Done
 459       char *print_strings[] =
 460       {
 461         "Full test   ",
 462         "No blending ",
 463         "No video    ",
 464         "No CPU      ",
 465         "No CPU/video",
 466         "CPU speed   ",
 467         "Video speed ",
 468         "Alpha cost  "
 469       };
 470       u32 i;
 471
 472       benchmark_ticks[6] = benchmark_ticks[0] - benchmark_ticks[2];
 473       benchmark_ticks[5] = benchmark_ticks[0] - benchmark_ticks[4] -
 474        benchmark_ticks[6];
 475       benchmark_ticks[7] = benchmark_ticks[0] - benchmark_ticks[1];
 476
 477       printf("Benchmark results (%d frames): \n", event_cycles_trigger);
 478       for(i = 0; i < 8; i++)
 479       {
 480         printf("   %s: %d ms (%f ms per frame)\n",
 481          print_strings[i], (u32)benchmark_ticks[i] / 1000,
 482          (float)(benchmark_ticks[i] / (1000.0 * event_cycles_trigger)));
 483         if(i == 4)
 484           printf("\n");
 485       }
 486       quit();
 487     }
 488   }
 489
 490   event_cycles = 0;
 491
 492   get_ticks_us(benchmark_ticks + event_number);
 493   event_number++;
 494 }
 495
 496 static u32 fps = 60;
 497 static u32 frames_drawn = 60;
 498
 499 u32 update_gba()
 500 {
 501   irq_type irq_raised = IRQ_NONE;
 502
 503   do
 504   {
 505     cpu_ticks += execute_cycles;
 506
 507     reg[CHANGED_PC_STATUS] = 0;
 508
 509     if(gbc_sound_update)
 510     {
 511       gbc_update_count++;
 512       update_gbc_sound(cpu_ticks);
 513       gbc_sound_update = 0;
 514     }
 515
 516     update_timer(0);
 517     update_timer(1);
 518     update_timer(2);
 519     update_timer(3);
 520
 521     video_count -= execute_cycles;
 522
 523     if(video_count <= 0)
 524     {
 525       u32 vcount = io_registers[REG_VCOUNT];
 526       u32 dispstat = io_registers[REG_DISPSTAT];
 527
 528       if((dispstat & 0x02) == 0)
 529       {
 530         // Transition from hrefresh to hblank
 531         video_count += (272);
 532         dispstat |= 0x02;
 533
 534         if((dispstat & 0x01) == 0)
 535         {
 536           u32 i;
 537           if(oam_update)
 538             oam_update_count++;
 539
 540           if(no_alpha)
 541             io_registers[REG_BLDCNT] = 0;
 542           update_scanline();
 543
 544           // If in visible area also fire HDMA
 545           for(i = 0; i < 4; i++)
 546           {
 547             if(dma[i].start_type == DMA_START_HBLANK)
 548               dma_transfer(dma + i);
 549           }
 550         }
 551
 552         if(dispstat & 0x10)
 553           irq_raised |= IRQ_HBLANK;
 554       }
 555       else
 556       {
 557         // Transition from hblank to next line
 558         video_count += 960;
 559         dispstat &= ~0x02;
 560
 561         vcount++;
 562
 563         if(vcount == 160)
 564         {
 565           // Transition from vrefresh to vblank
 566           u32 i;
 567
 568           dispstat |= 0x01;
 569           if(dispstat & 0x8)
 570           {
 571             irq_raised |= IRQ_VBLANK;
 572           }
 573
 574           affine_reference_x[0] =
 575            (s32)(address32(io_registers, 0x28) << 4) >> 4;
 576           affine_reference_y[0] =
 577            (s32)(address32(io_registers, 0x2C) << 4) >> 4;
 578           affine_reference_x[1] =
 579            (s32)(address32(io_registers, 0x38) << 4) >> 4;
 580           affine_reference_y[1] =
 581            (s32)(address32(io_registers, 0x3C) << 4) >> 4;
 582
 583           for(i = 0; i < 4; i++)
 584           {
 585             if(dma[i].start_type == DMA_START_VBLANK)
 586               dma_transfer(dma + i);
 587           }
 588         }
 589         else
 590
 591         if(vcount == 228)
 592         {
 593           // Transition from vblank to next screen
 594           dispstat &= ~0x01;
 595           frame_ticks++;
 596
 597   #ifdef PC_BUILD
 598         printf("frame update (%x), %d instructions total, %d RAM flushes\n",
 599            reg[REG_PC], instruction_count - last_frame, flush_ram_count);
 600           last_frame = instruction_count;
 601
 602 /*          printf("%d gbc audio updates\n", gbc_update_count);
 603           printf("%d oam updates\n", oam_update_count); */
 604           gbc_update_count = 0;
 605           oam_update_count = 0;
 606           flush_ram_count = 0;
 607   #endif
 608
 609           if(update_input())
 610             continue;
 611
 612           update_gbc_sound(cpu_ticks);
 613
 614           if(fps_debug)
 615           {
 616             char print_buffer[32];
 617             sprintf(print_buffer, "%d (%d)", fps, frames_drawn);
 618             print_string(print_buffer, 0xFFFF, 0x000, 0, 0);
 619           }
 620
 621           update_screen();
 622
 623           synchronize();
 624
 625           if(update_backup_flag)
 626             update_backup();
 627
 628           process_cheats();
 629
 630           event_cycles++;
 631           if(event_cycles == event_cycles_trigger)
 632           {
 633             trigger_ext_event();
 634             continue;
 635           }
 636
 637           vcount = 0;
 638         }
 639
 640         if(vcount == (dispstat >> 8))
 641         {
 642           // vcount trigger
 643           dispstat |= 0x04;
 644           if(dispstat & 0x20)
 645           {
 646             irq_raised |= IRQ_VCOUNT;
 647           }
 648         }
 649         else
 650         {
 651           dispstat &= ~0x04;
 652         }
 653
 654         io_registers[REG_VCOUNT] = vcount;
 655       }
 656       io_registers[REG_DISPSTAT] = dispstat;
 657     }
 658
 659     if(irq_raised)
 660       raise_interrupt(irq_raised);
 661
 662     execute_cycles = video_count;
 663
 664     check_timer(0);
 665     check_timer(1);
 666     check_timer(2);
 667     check_timer(3);
 668   } while(reg[CPU_HALT_STATE] != CPU_ACTIVE);
 669
 670   return execute_cycles;
 671 }
 672
 673 u64 last_screen_timestamp = 0;
 674 u32 frame_speed = 15000;
 675
 676
 677 #ifdef PSP_BUILD
 678
 679 u32 real_frame_count = 0;
 680 u32 virtual_frame_count = 0;
 681 u32 num_skipped_frames = 0;
 682
 683 void vblank_interrupt_handler(u32 sub, u32 *parg)
 684 {
 685   real_frame_count++;
 686 }
 687
 688 void synchronize()
 689 {
 690   char char_buffer[64];
 691   u64 new_ticks, time_delta;
 692   s32 used_frameskip = frameskip_value;
 693
 694   if(!synchronize_flag)
 695   {
 696     print_string("--FF--", 0xFFFF, 0x000, 0, 0);
 697     used_frameskip = 4;
 698     virtual_frame_count = real_frame_count - 1;
 699   }
 700
 701   skip_next_frame = 0;
 702
 703   virtual_frame_count++;
 704
 705   if(real_frame_count >= virtual_frame_count)
 706   {
 707     if((real_frame_count > virtual_frame_count) &&
 708      (current_frameskip_type == auto_frameskip) &&
 709      (num_skipped_frames < frameskip_value))
 710     {
 711       skip_next_frame = 1;
 712       num_skipped_frames++;
 713     }
 714     else
 715     {
 716       virtual_frame_count = real_frame_count;
 717       num_skipped_frames = 0;
 718     }
 719
 720     // Here so that the home button return will eventually work.
 721     // If it's not running fullspeed anyway this won't really hurt
 722     // it much more.
 723
 724     delay_us(1);
 725   }
 726   else
 727   {
 728     if(synchronize_flag)
 729       sceDisplayWaitVblankStart();
 730   }
 731
 732   if(current_frameskip_type == manual_frameskip)
 733   {
 734     frameskip_counter = (frameskip_counter + 1) %
 735      (used_frameskip + 1);
 736     if(random_skip)
 737     {
 738       if(frameskip_counter != (rand() % (used_frameskip + 1)))
 739         skip_next_frame = 1;
 740     }
 741     else
 742     {
 743       if(frameskip_counter)
 744         skip_next_frame = 1;
 745     }
 746   }
 747
 748 /*  sprintf(char_buffer, "%08d %08d %d %d %d\n",
 749    real_frame_count, virtual_frame_count, num_skipped_frames,
 750    real_frame_count - virtual_frame_count, skip_next_frame);
 751   print_string(char_buffer, 0xFFFF, 0x0000, 0, 10); */
 752
 753 /*
 754     sprintf(char_buffer, "%02d %02d %06d %07d", frameskip, (u32)ms_needed,
 755      ram_translation_ptr - ram_translation_cache, rom_translation_ptr -
 756      rom_translation_cache);
 757     print_string(char_buffer, 0xFFFF, 0x0000, 0, 0);
 758 */
 759 }
 760
 761 #endif
 762
 763 #ifdef GP2X_BUILD
 764
 765 u32 real_frame_count = 0;
 766 u32 virtual_frame_count = 0;
 767 u32 num_skipped_frames = 0;
 768 u32 interval_skipped_frames;
 769 u32 frames;
 770
 771 const u32 frame_interval = 60;
 772
 773 void synchronize()
 774 {
 775   u64 new_ticks;
 776   u64 time_delta;
 777
 778   get_ticks_us(&new_ticks);
 779   time_delta = new_ticks - last_screen_timestamp;
 780   last_screen_timestamp = new_ticks;
 781
 782   skip_next_frame = 0;
 783   virtual_frame_count++;
 784
 785   real_frame_count = ((new_ticks -
 786     frame_count_initial_timestamp) * 3) / 50000;
 787
 788   if(real_frame_count >= virtual_frame_count)
 789   {
 790     if((real_frame_count > virtual_frame_count) &&
 791      (current_frameskip_type == auto_frameskip) &&
 792      (num_skipped_frames < frameskip_value))
 793     {
 794       skip_next_frame = 1;
 795       num_skipped_frames++;
 796     }
 797     else
 798     {
 799       virtual_frame_count = real_frame_count;
 800       num_skipped_frames = 0;
 801     }
 802   }
 803
 804   frames++;
 805
 806   if(frames == frame_interval)
 807   {
 808     u32 new_fps;
 809     u32 new_frames_drawn;
 810
 811     time_delta = new_ticks - last_frame_interval_timestamp;
 812     new_fps = (u64)((u64)1000000 * (u64)frame_interval) / time_delta;
 813     new_frames_drawn =
 814      (frame_interval - interval_skipped_frames) * (60 / frame_interval);
 815
 816     // Left open for rolling averages
 817     fps = new_fps;
 818     frames_drawn = new_frames_drawn;
 819
 820     last_frame_interval_timestamp = new_ticks;
 821     interval_skipped_frames = 0;
 822     frames = 0;
 823   }
 824
 825   if(current_frameskip_type == manual_frameskip)
 826   {
 827     frameskip_counter = (frameskip_counter + 1) %
 828      (frameskip_value + 1);
 829     if(random_skip)
 830     {
 831       if(frameskip_counter != (rand() % (frameskip_value + 1)))
 832         skip_next_frame = 1;
 833     }
 834     else
 835     {
 836       if(frameskip_counter)
 837         skip_next_frame = 1;
 838     }
 839   }
 840
 841   interval_skipped_frames += skip_next_frame;
 842
 843   if(!synchronize_flag)
 844     print_string("--FF--", 0xFFFF, 0x000, 0, 0);
 845 }
 846
 847 #endif
 848
 849
 850 #ifdef PC_BUILD
 851
 852 u32 ticks_needed_total = 0;
 853 float us_needed = 0.0;
 854 u32 frames = 0;
 855 const u32 frame_interval = 60;
 856
 857 void synchronize()
 858 {
 859   u64 new_ticks;
 860   u64 time_delta;
 861   char char_buffer[64];
 862
 863   get_ticks_us(&new_ticks);
 864   time_delta = new_ticks - last_screen_timestamp;
 865   last_screen_timestamp = new_ticks;
 866   ticks_needed_total += time_delta;
 867
 868   skip_next_frame = 0;
 869
 870   if((time_delta < frame_speed) && synchronize_flag)
 871   {
 872     delay_us(frame_speed - time_delta);
 873   }
 874
 875   frames++;
 876
 877   if(frames == frame_interval)
 878   {
 879     us_needed = (float)ticks_needed_total / frame_interval;
 880     ticks_needed_total = 0;
 881     frames = 0;
 882   }
 883
 884   if(current_frameskip_type == manual_frameskip)
 885   {
 886     frameskip_counter = (frameskip_counter + 1) %
 887      (frameskip_value + 1);
 888     if(random_skip)
 889     {
 890       if(frameskip_counter != (rand() % (frameskip_value + 1)))
 891         skip_next_frame = 1;
 892     }
 893     else
 894     {
 895       if(frameskip_counter)
 896         skip_next_frame = 1;
 897     }
 898   }
 899
 900   if(synchronize_flag == 0)
 901     print_string("--FF--", 0xFFFF, 0x000, 0, 0);
 902
 903   sprintf(char_buffer, "gpSP: %.1fms %.1ffps", us_needed / 1000.0,
 904    1000000.0 / us_needed);
 905   SDL_WM_SetCaption(char_buffer, "gpSP");
 906
 907 /*
 908     sprintf(char_buffer, "%02d %02d %06d %07d", frameskip, (u32)ms_needed,
 909      ram_translation_ptr - ram_translation_cache, rom_translation_ptr -
 910      rom_translation_cache);
 911     print_string(char_buffer, 0xFFFF, 0x0000, 0, 0);
 912 */
 913 }
 914
 915 #endif
 916
 917 void quit()
 918 {
 919   if(!update_backup_flag)
 920     update_backup_force();
 921
 922   sound_exit();
 923
 924 #ifdef REGISTER_USAGE_ANALYZE
 925   print_register_usage();
 926 #endif
 927
 928 #ifdef PSP_BUILD
 929   sceKernelExitGame();
 930 #else
 931   SDL_Quit();
 932
 933 #ifdef GP2X_BUILD
 934   gp2x_quit();
 935 #endif
 936
 937   exit(0);
 938 #endif
 939 }
 940
 941 void reset_gba()
 942 {
 943   init_main();
 944   init_memory();
 945   init_cpu();
 946   reset_sound();
 947 }
 948
 949 #ifdef PSP_BUILD
 950
 951 u32 file_length(u8 *filename, s32 dummy)
 952 {
 953   SceIoStat stats;
 954   sceIoGetstat(filename, &stats);
 955   return stats.st_size;
 956 }
 957
 958 void delay_us(u32 us_count)
 959 {
 960   sceKernelDelayThread(us_count);
 961 }
 962
 963 void get_ticks_us(u64 *tick_return)
 964 {
 965   u64 ticks;
 966   sceRtcGetCurrentTick(&ticks);
 967
 968   *tick_return = (ticks * 1000000) / sceRtcGetTickResolution();
 969 }
 970
 971 #else
 972
 973 u32 file_length(u8 *dummy, FILE *fp)
 974 {
 975   u32 length;
 976
 977   fseek(fp, 0, SEEK_END);
 978   length = ftell(fp);
 979   fseek(fp, 0, SEEK_SET);
 980
 981   return length;
 982 }
 983
 984 #ifdef PC_BUILD
 985
 986 void delay_us(u32 us_count)
 987 {
 988   SDL_Delay(us_count / 1000);
 989 }
 990
 991 void get_ticks_us(u64 *ticks_return)
 992 {
 993   *ticks_return = (SDL_GetTicks() * 1000);
 994 }
 995
 996 #else
 997
 998 void delay_us(u32 us_count)
 999 {
1000   //usleep(us_count);
1001   SDL_Delay(us_count / 1000);
1002 }
1003
1004 void get_ticks_us(u64 *ticks_return)
1005 {
1006   struct timeval current_time;
1007   gettimeofday(&current_time, NULL);
1008
1009   *ticks_return =
1010    (u64)current_time.tv_sec * 1000000 + current_time.tv_usec;
1011 }
1012
1013 #endif
1014
1015 #endif
1016
1017 void change_ext(u8 *src, u8 *buffer, u8 *extension)
1018 {
1019   u8 *dot_position;
1020   strcpy(buffer, src);
1021   dot_position = strrchr(buffer, '.');
1022
1023   if(dot_position)
1024     strcpy(dot_position, extension);
1025 }
1026
1027 #define main_savestate_builder(type)                                          \
1028 void main_##type##_savestate(file_tag_type savestate_file)                    \
1029 {                                                                             \
1030   file_##type##_variable(savestate_file, cpu_ticks);                          \
1031   file_##type##_variable(savestate_file, execute_cycles);                     \
1032   file_##type##_variable(savestate_file, video_count);                        \
1033   file_##type##_array(savestate_file, timer);                                 \
1034 }                                                                             \
1035
1036 main_savestate_builder(read);
1037 main_savestate_builder(write_mem);
1038
1039
1040 void printout(void *str, u32 val)
1041 {
1042   printf(str, val);
1043 }
1044
1045 void set_clock_speed()
1046 {
1047   static u32 clock_speed_old = default_clock_speed;
1048   if (clock_speed != clock_speed_old)
1049   {
1050     printf("about to set CPU clock to %iMHz\n", clock_speed);
1051   #ifdef PSP_BUILD
1052     scePowerSetClockFrequency(clock_speed, clock_speed, clock_speed / 2);
1053   #elif defined(GP2X_BUILD)
1054     set_FCLK(clock_speed);
1055   #endif
1056     clock_speed_old = clock_speed;
1057   }
1058 }
1059