Shamusworld >> Repos - apple2/blob - src/apple2.cpp

   1 //
   2 // Apple 2 SDL Portable Apple Emulator
   3 //
   4 // by James Hammons
   5 // © 2014 Underground Software
   6 //
   7 // Loosely based on AppleWin by Tom Charlesworth which was based on AppleWin by
   8 // Oliver Schmidt which was based on AppleWin by Michael O'Brien. :-) Parts are
   9 // also derived from ApplePC. Too bad it was closed source--it could have been
  10 // *the* premier Apple II emulator out there.
  11 //
  12 // JLH = James Hammons <jlhamm@acm.org>
  13 //
  14 // WHO  WHEN        WHAT
  15 // ---  ----------  ------------------------------------------------------------
  16 // JLH  11/12/2005  Initial port to SDL
  17 // JLH  11/18/2005  Wired up graphic soft switches
  18 // JLH  12/02/2005  Setup timer subsystem for more accurate time keeping
  19 // JLH  12/12/2005  Added preliminary state saving support
  20 // JLH  09/24/2013  Added //e support
  21 //
  22
  23 // STILL TO DO:
  24 //
  25 // - Port to SDL [DONE]
  26 // - GUI goodies
  27 // - Weed out unneeded functions [DONE]
  28 // - Disk I/O [DONE]
  29 // - 128K IIe related stuff [DONE]
  30 // - State loading/saving
  31 //
  32
  33 #include "apple2.h"
  34
  35 #include <SDL2/SDL.h>
  36 #include <fstream>
  37 #include <string>
  38 #include <iomanip>
  39 #include <iostream>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <time.h>
  43 #include "log.h"
  44 #include "video.h"
  45 #include "sound.h"
  46 #include "settings.h"
  47 #include "v65c02.h"
  48 #include "applevideo.h"
  49 #include "timing.h"
  50 #include "floppy.h"
  51 #include "firmware.h"
  52 #include "mmu.h"
  53
  54 #include "gui/gui.h"
  55
  56 // Debug and misc. defines
  57
  58 #define THREADED_65C02
  59 #define CPU_THREAD_OVERFLOW_COMPENSATION
  60 #define DEBUG_LC
  61 //#define CPU_CLOCK_CHECKING
  62 //#define THREAD_DEBUGGING
  63 #define SOFT_SWITCH_DEBUGGING
  64
  65 // Global variables
  66
  67 uint8_t ram[0x10000], rom[0x10000];                     // RAM & ROM spaces
  68 uint8_t ram2[0x10000];                                          // Auxillary RAM
  69 //uint8_t diskRom[0x100];                                               // Disk ROM space
  70 V65C02REGS mainCPU;                                                     // v65C02 execution context
  71 uint8_t appleType = APPLE_TYPE_IIE;
  72 FloppyDrive floppyDrive;
  73 //bool powerOnState = true;                                     // Virtual power switch
  74 bool powerStateChangeRequested = false;
  75
  76 // Local variables
  77
  78 uint8_t lastKeyPressed = 0;
  79 bool keyDown = false;
  80 bool openAppleDown = false;
  81 bool closedAppleDown = false;
  82 bool store80Mode = false;
  83 bool vbl = false;
  84 bool slotCXROM = false;
  85 bool slotC3ROM = false;
  86 bool ramrd = false;
  87 bool ramwrt = false;
  88 bool altzp = false;
  89 bool ioudis = true;
  90 bool dhires = false;
  91 // Language card state (ROM read, no write)
  92 uint8_t lcState = 0x02;
  93
  94 static bool running = true;                                     // Machine running state flag...
  95 static uint32_t startTicks;
  96 static bool pauseMode = false;
  97 static bool fullscreenDebounce = false;
  98 static bool capsLock = false;
  99 static bool capsLockDebounce = false;
 100
 101 // Local functions (technically, they're global...)
 102
 103 bool LoadImg(char * filename, uint8_t * ram, int size);
 104 static void SaveApple2State(const char * filename);
 105 static bool LoadApple2State(const char * filename);
 106 static void ResetApple2State(void);
 107
 108 // Local timer callback functions
 109
 110 static void FrameCallback(void);
 111 static void BlinkTimer(void);
 112
 113 #ifdef THREADED_65C02
 114 // Test of threaded execution of 6502
 115 static SDL_Thread * cpuThread = NULL;
 116 //static SDL_mutex * cpuMutex = NULL;
 117 static SDL_cond * cpuCond = NULL;
 118 static SDL_sem * mainSem = NULL;
 119 static bool cpuFinished = false;
 120 //static bool cpuSleep = false;
 121
 122 // NB: Apple //e Manual sez 6502 is running @ 1,022,727 Hz
 123
 124 // Let's try a thread...
 125 /*
 126 Here's how it works: Execute 1 frame's worth, then sleep.
 127 Other stuff wakes it up
 128 */
 129 int CPUThreadFunc(void * data)
 130 {
 131         // Mutex must be locked for conditional to work...
 132         // Also, must be created in the thread that uses it...
 133         SDL_mutex * cpuMutex = SDL_CreateMutex();
 134
 135 // decrement mainSem...
 136 //SDL_SemWait(mainSem);
 137 #ifdef CPU_THREAD_OVERFLOW_COMPENSATION
 138         float overflow = 0.0;
 139 #endif
 140
 141         do
 142         {
 143 // This is never set to true anywhere...
 144 //              if (cpuSleep)
 145 //                      SDL_CondWait(cpuCond, cpuMutex);
 146
 147 // decrement mainSem...
 148 #ifdef THREAD_DEBUGGING
 149 WriteLog("CPU: SDL_SemWait(mainSem);\n");
 150 #endif
 151                 SDL_SemWait(mainSem);
 152
 153 // There are exactly 800 slices of 21.333 cycles per frame, so it works out
 154 // evenly.
 155 #ifdef THREAD_DEBUGGING
 156 WriteLog("CPU: Execute65C02(&mainCPU, cycles);\n");
 157 #endif
 158                 for(int i=0; i<800; i++)
 159                 {
 160                         uint32_t cycles = 21;
 161                         overflow += 0.333333334;
 162
 163                         if (overflow > 1.0)
 164                         {
 165                                 cycles++;
 166                                 overflow -= 1.0;
 167                         }
 168
 169                         Execute65C02(&mainCPU, cycles);
 170                         WriteSampleToBuffer();
 171
 172                         // Dunno if this is correct (seems to be close enough)...
 173                         vbl = (i < 670 ? true : false);
 174                 }
 175
 176 #ifdef THREAD_DEBUGGING
 177 WriteLog("CPU: SDL_mutexP(cpuMutex);\n");
 178 #endif
 179                 SDL_mutexP(cpuMutex);
 180 // increment mainSem...
 181 #ifdef THREAD_DEBUGGING
 182 WriteLog("CPU: SDL_SemPost(mainSem);\n");
 183 #endif
 184                 SDL_SemPost(mainSem);
 185 #ifdef THREAD_DEBUGGING
 186 WriteLog("CPU: SDL_CondWait(cpuCond, cpuMutex);\n");
 187 #endif
 188                 SDL_CondWait(cpuCond, cpuMutex);
 189
 190 #ifdef THREAD_DEBUGGING
 191 WriteLog("CPU: SDL_mutexV(cpuMutex);\n");
 192 #endif
 193                 SDL_mutexV(cpuMutex);
 194         }
 195         while (!cpuFinished);
 196
 197         SDL_DestroyMutex(cpuMutex);
 198
 199         return 0;
 200 }
 201 #endif
 202
 203
 204 #if 1
 205 //
 206 // Request a change in the power state of the emulated Apple
 207 //
 208 void SetPowerState(void)
 209 {
 210 //      powerOnState = state;
 211 //      pauseMode = !state;
 212
 213 //      if (!pauseMode)
 214 //      {
 215 //printf("Turning on...\n");
 216                 // Transitioning from OFF to ON
 217 //              mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
 218 //              SoundResume();
 219 //      }
 220 //      else
 221 //      {
 222 //printf("Turning off...\n");
 223                 // Turn it off...
 224 //              SoundPause();
 225 //      }
 226         powerStateChangeRequested = true;
 227 }
 228 #endif
 229
 230
 231 //
 232 // Load a file into RAM/ROM image space
 233 //
 234 bool LoadImg(char * filename, uint8_t * ram, int size)
 235 {
 236         FILE * fp = fopen(filename, "rb");
 237
 238         if (fp == NULL)
 239                 return false;
 240
 241         fread(ram, 1, size, fp);
 242         fclose(fp);
 243
 244         return true;
 245 }
 246
 247
 248 static void SaveApple2State(const char * filename)
 249 {
 250 }
 251
 252
 253 static bool LoadApple2State(const char * filename)
 254 {
 255         return false;
 256 }
 257
 258
 259 static void ResetApple2State(void)
 260 {
 261         keyDown = false;
 262         openAppleDown = false;
 263         closedAppleDown = false;
 264         store80Mode = false;
 265         vbl = false;
 266         slotCXROM = false;
 267         slotC3ROM = false;
 268         ramrd = false;
 269         ramwrt = false;
 270         altzp = false;
 271         ioudis = true;
 272         dhires = false;
 273         lcState = 0x02;
 274 //      SwitchLC();                     // Make sure MMU is in sane state
 275 //NOPE, does nothing    SetupAddressMap();
 276         ResetMMUPointers();
 277
 278         // Without this, you can wedge the system :-/
 279         memset(ram, 0, 0x10000);
 280 //      memset(ram2, 0, 0x10000);
 281         mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
 282 }
 283
 284
 285 #ifdef CPU_CLOCK_CHECKING
 286 uint8_t counter = 0;
 287 uint32_t totalCPU = 0;
 288 uint64_t lastClock = 0;
 289 #endif
 290 //
 291 // Main loop
 292 //
 293 int main(int /*argc*/, char * /*argv*/[])
 294 {
 295         InitLog("./apple2.log");
 296         LoadSettings();
 297         srand(time(NULL));                                                                      // Initialize RNG
 298
 299         // Zero out memory
 300         memset(ram, 0, 0x10000);
 301         memset(rom, 0, 0x10000);
 302         memset(ram2, 0, 0x10000);
 303
 304         // Set up MMU
 305         SetupAddressMap();
 306         ResetMMUPointers();
 307
 308         // Set up V65C02 execution context
 309         memset(&mainCPU, 0, sizeof(V65C02REGS));
 310         mainCPU.RdMem = AppleReadMem;
 311         mainCPU.WrMem = AppleWriteMem;
 312         mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
 313
 314 //      alternateCharset = true;
 315 //      if (!LoadImg(settings.BIOSPath, rom + 0xD000, 0x3000))
 316         if (!LoadImg(settings.BIOSPath, rom + 0xC000, 0x4000))
 317         {
 318                 WriteLog("Could not open file '%s'!\n", settings.BIOSPath);
 319                 return -1;
 320         }
 321
 322 //Load up disk image from config file (for now)...
 323         floppyDrive.LoadImage(settings.diskImagePath1, 0);
 324         floppyDrive.LoadImage(settings.diskImagePath2, 1);
 325 //      floppyDrive.LoadImage("./disks/temp.nib", 1);   // Load temp .nib file into second drive...
 326
 327         WriteLog("About to initialize video...\n");
 328
 329         if (!InitVideo())
 330         {
 331                 std::cout << "Aborting!" << std::endl;
 332                 return -1;
 333         }
 334
 335         GUI::Init(sdlRenderer);
 336
 337         // Have to do this *after* video init but *before* sound init...!
 338 //Shouldn't be necessary since we're not doing emulation in the ISR...
 339         if (settings.autoStateSaving)
 340         {
 341                 // Load last state from file...
 342                 if (!LoadApple2State(settings.autoStatePath))
 343                         WriteLog("Unable to use Apple2 state file \"%s\"!\n", settings.autoStatePath);
 344         }
 345
 346         WriteLog("About to initialize audio...\n");
 347         SoundInit();
 348         SetupBlurTable();                                                       // Set up the color TV emulation blur table
 349         running = true;                                                         // Set running status...
 350         InitializeEventList();                                          // Clear the event list before we use it...
 351         SetCallbackTime(FrameCallback, 16666.66666667); // Set frame to fire at 1/60 s interval
 352         SetCallbackTime(BlinkTimer, 250000);            // Set up blinking at 1/4 s intervals
 353         startTicks = SDL_GetTicks();
 354
 355 #ifdef THREADED_65C02
 356         cpuCond = SDL_CreateCond();
 357         mainSem = SDL_CreateSemaphore(1);
 358         cpuThread = SDL_CreateThread(CPUThreadFunc, NULL, NULL);
 359 //Hmm... CPU does POST (+1), wait, then WAIT (-1)
 360 //      SDL_sem * mainMutex = SDL_CreateMutex();
 361 #endif
 362
 363         WriteLog("Entering main loop...\n");
 364
 365         while (running)
 366         {
 367                 double timeToNextEvent = GetTimeToNextEvent();
 368 #ifndef THREADED_65C02
 369                 Execute65C02(&mainCPU, USEC_TO_M6502_CYCLES(timeToNextEvent));
 370 #endif
 371
 372 #ifdef CPU_CLOCK_CHECKING
 373 #ifndef THREADED_65C02
 374 totalCPU += USEC_TO_M6502_CYCLES(timeToNextEvent);
 375 #endif
 376 #endif
 377                 HandleNextEvent();
 378         }
 379
 380 #ifdef THREADED_65C02
 381 WriteLog("Main: cpuFinished = true;\n");
 382 cpuFinished = true;
 383 //#warning "If sound thread is behind, CPU thread will never wake up... !!! FIX !!!" [DONE]
 384 //What to do? How do you know when the CPU is sleeping???
 385 //USE A CONDITIONAL!!! OF COURSE!!!!!!11!11!11!!!1!
 386 //Nope, use a semaphore...
 387 WriteLog("Main: SDL_SemWait(mainSem);\n");
 388         // Only do this if NOT in power off/emulation paused mode!
 389         if (!pauseMode)
 390                 // Should lock until CPU thread is waiting...
 391                 SDL_SemWait(mainSem);
 392 #endif
 393
 394 WriteLog("Main: SDL_CondSignal(cpuCond);//thread is probably asleep, wake it up\n");
 395         SDL_CondSignal(cpuCond);//thread is probably asleep, wake it up
 396 WriteLog("Main: SDL_WaitThread(cpuThread, NULL);\n");
 397         SDL_WaitThread(cpuThread, NULL);
 398 //nowok:SDL_WaitThread(CPUThreadFunc, NULL);
 399 WriteLog("Main: SDL_DestroyCond(cpuCond);\n");
 400         SDL_DestroyCond(cpuCond);
 401         SDL_DestroySemaphore(mainSem);
 402
 403         if (settings.autoStateSaving)
 404         {
 405                 // Save state here...
 406                 SaveApple2State(settings.autoStatePath);
 407         }
 408
 409         floppyDrive.SaveImage(0);
 410         floppyDrive.SaveImage(1);
 411
 412         SoundDone();
 413         VideoDone();
 414         SaveSettings();
 415         LogDone();
 416
 417         return 0;
 418 }
 419
 420
 421 /*
 422 Apple II keycodes
 423 -----------------
 424
 425 Key     Aln CTL SHF BTH
 426 -----------------------
 427 space   $A0     $A0     $A0 $A0         No xlation
 428 RETURN  $8D     $8D     $8D     $8D             No xlation
 429 0               $B0     $B0     $B0     $B0             Need to screen shift+0 (?)
 430 1!              $B1 $B1 $A1 $A1         No xlation
 431 2"              $B2     $B2     $A2     $A2             No xlation
 432 3#              $B3     $B3     $A3     $A3             No xlation
 433 4$              $B4     $B4     $A4     $A4             No xlation
 434 5%              $B5     $B5     $A5     $A5             No xlation
 435 6&              $B6     $B6     $A6     $A6             No xlation
 436 7'              $B7     $B7     $A7     $A7             No xlation
 437 8(              $B8     $B8     $A8     $A8             No xlation
 438 9)              $B9     $B9     $A9     $A9             No xlation
 439 :*              $BA     $BA     $AA     $AA             No xlation
 440 ;+              $BB     $BB     $AB     $AB             No xlation
 441 ,<              $AC     $AC     $BC     $BC             No xlation
 442 -=              $AD     $AD     $BD     $BD             No xlation
 443 .>              $AE     $AE     $BE     $BE             No xlation
 444 /?              $AF     $AF     $BF     $BF             No xlation
 445 A               $C1     $81     $C1     $81
 446 B               $C2     $82     $C2     $82
 447 C               $C3     $83     $C3     $83
 448 D               $C4     $84     $C4     $84
 449 E               $C5     $85     $C5     $85
 450 F               $C6     $86     $C6     $86
 451 G               $C7     $87     $C7     $87
 452 H               $C8     $88     $C8     $88
 453 I               $C9     $89     $C9     $89
 454 J               $CA     $8A     $CA     $8A
 455 K               $CB     $8B     $CB     $8B
 456 L               $CC     $8C     $CC     $8C
 457 M               $CD     $8D     $DD     $9D             -> ODD
 458 N^              $CE     $8E     $DE     $9E             -> ODD
 459 O               $CF     $8F     $CF     $8F
 460 P@              $D0     $90     $C0     $80             Need to xlate CTL+SHFT+P & SHFT+P (?)
 461 Q               $D1     $91     $D1     $91
 462 R               $D2     $92     $D2     $92
 463 S               $D3     $93     $D3     $93
 464 T               $D4     $94     $D4     $94
 465 U               $D5     $95     $D5     $95
 466 V               $D6     $96     $D6     $96
 467 W               $D7     $97     $D7     $97
 468 X               $D8     $98     $D8     $98
 469 Y               $D9     $99     $D9     $99
 470 Z               $DA     $9A     $DA     $9A
 471 <-              $88     $88     $88     $88
 472 ->              $95     $95     $95     $95
 473 ESC             $9B     $9B     $9B     $9B             No xlation
 474
 475 */
 476 //static uint64_t lastCPUCycles = 0;
 477 static uint32_t frameCount = 0;
 478 static void FrameCallback(void)
 479 {
 480         SDL_Event event;
 481
 482         while (SDL_PollEvent(&event))
 483         {
 484                 switch (event.type)
 485                 {
 486 // Problem with using SDL_TEXTINPUT is that it causes key delay. :-/
 487 #if 0
 488                 case SDL_TEXTINPUT:
 489 //Need to do some key translation here, and screen out non-apple keys as well...
 490 //(really, could do it all in SDL_KEYDOWN, would just have to get symbols &
 491 // everything else done separately. this is slightly easier. :-P)
 492 //                      if (event.key.keysym.sym == SDLK_TAB)   // Prelim key screening...
 493                         if (event.edit.text[0] == '\t') // Prelim key screening...
 494                                 break;
 495
 496                         lastKeyPressed = event.edit.text[0];
 497                         keyDown = true;
 498
 499                         //kludge: should have a caps lock thingy here...
 500                         //or all uppercase for ][+...
 501 //                      if (lastKeyPressed >= 'a' && lastKeyPressed <='z')
 502 //                              lastKeyPressed &= 0xDF;         // Convert to upper case...
 503
 504                         break;
 505 #endif
 506                 case SDL_KEYDOWN:
 507                         // Use ALT+Q to exit, as well as the usual window decoration method
 508                         if (event.key.keysym.sym == SDLK_q && (event.key.keysym.mod & KMOD_ALT))
 509                                 running = false;
 510
 511                         // CTRL+RESET key emulation (mapped to CTRL+`)
 512 // This doesn't work...
 513 //                      if (event.key.keysym.sym == SDLK_BREAK && (event.key.keysym.mod & KMOD_CTRL))
 514 //                      if (event.key.keysym.sym == SDLK_PAUSE && (event.key.keysym.mod & KMOD_CTRL))
 515                         if (event.key.keysym.sym == SDLK_BACKQUOTE && (event.key.keysym.mod & KMOD_CTRL))
 516                         {
 517 //NOTE that this shouldn't take place until the key is lifted... !!! FIX !!!
 518 //ALSO it seems to leave the machine in an inconsistent state vis-a-vis the language card...
 519                                 mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
 520                                 break;
 521                         }
 522
 523                         if (event.key.keysym.sym == SDLK_RIGHT)
 524                                 lastKeyPressed = 0x15, keyDown = true;
 525                         else if (event.key.keysym.sym == SDLK_LEFT)
 526                                 lastKeyPressed = 0x08, keyDown = true;
 527                         else if (event.key.keysym.sym == SDLK_UP)
 528                                 lastKeyPressed = 0x0B, keyDown = true;
 529                         else if (event.key.keysym.sym == SDLK_DOWN)
 530                                 lastKeyPressed = 0x0A, keyDown = true;
 531                         else if (event.key.keysym.sym == SDLK_RETURN)
 532                                 lastKeyPressed = 0x0D, keyDown = true;
 533                         else if (event.key.keysym.sym == SDLK_ESCAPE)
 534                                 lastKeyPressed = 0x1B, keyDown = true;
 535                         else if (event.key.keysym.sym == SDLK_BACKSPACE)
 536                                 lastKeyPressed = 0x7F, keyDown = true;
 537
 538                         // Fix CTRL+key combo...
 539                         if (event.key.keysym.mod & KMOD_CTRL)
 540                         {
 541                                 if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
 542                                 {
 543                                         lastKeyPressed = (event.key.keysym.sym - SDLK_a) + 1;
 544                                         keyDown = true;
 545 //printf("Key combo pressed: CTRL+%c\n", lastKeyPressed + 0x40);
 546                                         break;
 547                                 }
 548                         }
 549
 550 #if 1
 551                         // Fix SHIFT+key combo...
 552                         if (event.key.keysym.mod & KMOD_SHIFT)
 553                         {
 554                                 if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
 555                                 {
 556                                         lastKeyPressed = (event.key.keysym.sym - SDLK_a) + 0x41;
 557                                         keyDown = true;
 558 //printf("Key combo pressed: CTRL+%c\n", lastKeyPressed + 0x40);
 559                                         break;
 560                                 }
 561                                 else if (event.key.keysym.sym == SDLK_1)
 562                                 {
 563                                         lastKeyPressed = '!';
 564                                         keyDown = true;
 565                                         break;
 566                                 }
 567                                 else if (event.key.keysym.sym == SDLK_2)
 568                                 {
 569                                         lastKeyPressed = '@';
 570                                         keyDown = true;
 571                                         break;
 572                                 }
 573                                 else if (event.key.keysym.sym == SDLK_3)
 574                                 {
 575                                         lastKeyPressed = '#';
 576                                         keyDown = true;
 577                                         break;
 578                                 }
 579                                 else if (event.key.keysym.sym == SDLK_3)
 580                                 {
 581                                         lastKeyPressed = '#';
 582                                         keyDown = true;
 583                                         break;
 584                                 }
 585                                 else if (event.key.keysym.sym == SDLK_4)
 586                                 {
 587                                         lastKeyPressed = '$';
 588                                         keyDown = true;
 589                                         break;
 590                                 }
 591                                 else if (event.key.keysym.sym == SDLK_5)
 592                                 {
 593                                         lastKeyPressed = '%';
 594                                         keyDown = true;
 595                                         break;
 596                                 }
 597                                 else if (event.key.keysym.sym == SDLK_6)
 598                                 {
 599                                         lastKeyPressed = '^';
 600                                         keyDown = true;
 601                                         break;
 602                                 }
 603                                 else if (event.key.keysym.sym == SDLK_7)
 604                                 {
 605                                         lastKeyPressed = '&';
 606                                         keyDown = true;
 607                                         break;
 608                                 }
 609                                 else if (event.key.keysym.sym == SDLK_8)
 610                                 {
 611                                         lastKeyPressed = '*';
 612                                         keyDown = true;
 613                                         break;
 614                                 }
 615                                 else if (event.key.keysym.sym == SDLK_9)
 616                                 {
 617                                         lastKeyPressed = '(';
 618                                         keyDown = true;
 619                                         break;
 620                                 }
 621                                 else if (event.key.keysym.sym == SDLK_0)
 622                                 {
 623                                         lastKeyPressed = ')';
 624                                         keyDown = true;
 625                                         break;
 626                                 }
 627                                 else if (event.key.keysym.sym == SDLK_MINUS)
 628                                 {
 629                                         lastKeyPressed = '_';
 630                                         keyDown = true;
 631                                         break;
 632                                 }
 633                                 else if (event.key.keysym.sym == SDLK_EQUALS)
 634                                 {
 635                                         lastKeyPressed = '+';
 636                                         keyDown = true;
 637                                         break;
 638                                 }
 639                                 else if (event.key.keysym.sym == SDLK_LEFTBRACKET)
 640                                 {
 641                                         lastKeyPressed = '{';
 642                                         keyDown = true;
 643                                         break;
 644                                 }
 645                                 else if (event.key.keysym.sym == SDLK_RIGHTBRACKET)
 646                                 {
 647                                         lastKeyPressed = '}';
 648                                         keyDown = true;
 649                                         break;
 650                                 }
 651                                 else if (event.key.keysym.sym == SDLK_BACKSLASH)
 652                                 {
 653                                         lastKeyPressed = '|';
 654                                         keyDown = true;
 655                                         break;
 656                                 }
 657                                 else if (event.key.keysym.sym == SDLK_SEMICOLON)
 658                                 {
 659                                         lastKeyPressed = ':';
 660                                         keyDown = true;
 661                                         break;
 662                                 }
 663                                 else if (event.key.keysym.sym == SDLK_QUOTE)
 664                                 {
 665                                         lastKeyPressed = '"';
 666                                         keyDown = true;
 667                                         break;
 668                                 }
 669                                 else if (event.key.keysym.sym == SDLK_COMMA)
 670                                 {
 671                                         lastKeyPressed = '<';
 672                                         keyDown = true;
 673                                         break;
 674                                 }
 675                                 else if (event.key.keysym.sym == SDLK_PERIOD)
 676                                 {
 677                                         lastKeyPressed = '>';
 678                                         keyDown = true;
 679                                         break;
 680                                 }
 681                                 else if (event.key.keysym.sym == SDLK_SLASH)
 682                                 {
 683                                         lastKeyPressed = '?';
 684                                         keyDown = true;
 685                                         break;
 686                                 }
 687                                 else if (event.key.keysym.sym == SDLK_BACKQUOTE)
 688                                 {
 689                                         lastKeyPressed = '~';
 690                                         keyDown = true;
 691                                         break;
 692                                 }
 693                         }
 694 #endif
 695
 696                         // General keys...
 697                         if (event.key.keysym.sym >= SDLK_SPACE && event.key.keysym.sym <= SDLK_z)
 698                         {
 699                                 lastKeyPressed = event.key.keysym.sym;
 700                                 keyDown = true;
 701
 702                                 // Check for Caps Lock key...
 703                                 if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z && capsLock)
 704                                         lastKeyPressed -= 0x20;
 705
 706                                 break;
 707                         }
 708
 709                         if (event.key.keysym.sym == SDLK_PAUSE)
 710                         {
 711                                 pauseMode = !pauseMode;
 712
 713                                 if (pauseMode)
 714                                 {
 715                                         SoundPause();
 716                                         SpawnMessage("*** PAUSED ***");
 717                                 }
 718                                 else
 719                                 {
 720                                         SoundResume();
 721                                         SpawnMessage("*** RESUME ***");
 722                                 }
 723                         }
 724
 725                         // Paddle buttons 0 & 1
 726                         if (event.key.keysym.sym == SDLK_INSERT)
 727                                 openAppleDown = true;
 728                         if (event.key.keysym.sym == SDLK_PAGEUP)
 729                                 closedAppleDown = true;
 730
 731                         if (event.key.keysym.sym == SDLK_F11)
 732                                 dumpDis = !dumpDis;                             // Toggle the disassembly process
 733
 734 /*else if (event.key.keysym.sym == SDLK_F9)
 735 {
 736         floppyDrive.CreateBlankImage(0);
 737 //      SpawnMessage("Image cleared...");
 738 }//*/
 739 /*else if (event.key.keysym.sym == SDLK_F10)
 740 {
 741         floppyDrive.SwapImages();
 742 //      SpawnMessage("Image swapped...");
 743 }//*/
 744
 745                         if (event.key.keysym.sym == SDLK_F2)// Toggle the palette
 746                                 TogglePalette();
 747                         else if (event.key.keysym.sym == SDLK_F3)// Cycle through screen types
 748                                 CycleScreenTypes();
 749                         else if (event.key.keysym.sym == SDLK_F5)
 750                         {
 751                                 VolumeDown();
 752                                 char volStr[19] = "[****************]";
 753 //                              volStr[GetVolume()] = 0;
 754                                 for(int i=GetVolume(); i<16; i++)
 755                                         volStr[1 + i] = '-';
 756                                 SpawnMessage("Volume: %s", volStr);
 757                         }
 758                         else if (event.key.keysym.sym == SDLK_F6)
 759                         {
 760                                 VolumeUp();
 761                                 char volStr[19] = "[****************]";
 762 //                              volStr[GetVolume()] = 0;
 763                                 for(int i=GetVolume(); i<16; i++)
 764                                         volStr[1 + i] = '-';
 765                                 SpawnMessage("Volume: %s", volStr);
 766                         }
 767                         else if (event.key.keysym.sym == SDLK_F12)
 768                         {
 769                                 if (!fullscreenDebounce)
 770                                 {
 771                                         ToggleFullScreen();
 772                                         fullscreenDebounce = true;
 773                                 }
 774                         }
 775
 776                         if (event.key.keysym.sym == SDLK_CAPSLOCK)
 777                         {
 778                                 if (!capsLockDebounce)
 779                                 {
 780                                         capsLock = !capsLock;
 781                                         capsLockDebounce = true;
 782                                 }
 783                         }
 784
 785                         break;
 786                 case SDL_KEYUP:
 787                         if (event.key.keysym.sym == SDLK_F12)
 788                                 fullscreenDebounce = false;
 789                         if (event.key.keysym.sym == SDLK_CAPSLOCK)
 790                                 capsLockDebounce = false;
 791
 792                         // Paddle buttons 0 & 1
 793                         if (event.key.keysym.sym == SDLK_INSERT)
 794                                 openAppleDown = false;
 795                         if (event.key.keysym.sym == SDLK_PAGEUP)
 796                                 closedAppleDown = false;
 797
 798 //                      if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
 799 //                              keyDown = false;
 800
 801                         break;
 802                 case SDL_MOUSEBUTTONDOWN:
 803                         GUI::MouseDown(event.motion.x, event.motion.y, event.motion.state);
 804                         break;
 805                 case SDL_MOUSEBUTTONUP:
 806                         GUI::MouseUp(event.motion.x, event.motion.y, event.motion.state);
 807                         break;
 808                 case SDL_MOUSEMOTION:
 809                         GUI::MouseMove(event.motion.x, event.motion.y, event.motion.state);
 810                         break;
 811                 case SDL_WINDOWEVENT:
 812                         if (event.window.event == SDL_WINDOWEVENT_LEAVE)
 813                                 GUI::MouseMove(0, 0, 0);
 814
 815                         break;
 816                 case SDL_QUIT:
 817                         running = false;
 818                 }
 819         }
 820
 821         // Handle power request from the GUI
 822         if (powerStateChangeRequested)
 823         {
 824                 if (GUI::powerOnState)
 825                 {
 826                         pauseMode = false;
 827 //                      SoundResume();
 828                         // Unlock the CPU thread...
 829                         SDL_SemPost(mainSem);
 830                 }
 831                 else
 832                 {
 833                         pauseMode = true;
 834                         // Should lock until CPU thread is waiting...
 835                         SDL_SemWait(mainSem);
 836 //                      SoundPause();
 837                         ResetApple2State();
 838                 }
 839
 840                 powerStateChangeRequested = false;
 841         }
 842
 843 //#warning "!!! Taking MAJOR time hit with the video frame rendering !!!"
 844 //      if (!pauseMode)
 845         {
 846                 RenderVideoFrame();
 847         }
 848
 849         RenderScreenBuffer();
 850         GUI::Render(sdlRenderer);
 851         SDL_RenderPresent(sdlRenderer);
 852         SetCallbackTime(FrameCallback, 16666.66666667);
 853
 854 #ifdef CPU_CLOCK_CHECKING
 855 //We know it's stopped, so we can get away with this...
 856 counter++;
 857 if (counter == 60)
 858 {
 859         uint64_t clock = GetCurrentV65C02Clock();
 860 //totalCPU += (uint32_t)(clock - lastClock);
 861
 862         printf("Executed %u cycles...\n", (uint32_t)(clock - lastClock));
 863         lastClock = clock;
 864 //      totalCPU = 0;
 865         counter = 0;
 866 }
 867 #endif
 868
 869 // This is the problem: If you set the interval to 16, it runs faster than
 870 // 1/60s per frame. If you set it to 17, it runs slower. What we need is to
 871 // have it do 16 for one frame, then 17 for two others. Then it should average
 872 // out to 1/60s per frame every 3 frames.
 873         frameCount = (frameCount + 1) % 3;
 874         uint32_t waitFrameTime = 17 - (frameCount == 0 ? 1 : 0);
 875
 876         // Wait for next frame...
 877         while (SDL_GetTicks() - startTicks < waitFrameTime)
 878                 SDL_Delay(1);
 879
 880         startTicks = SDL_GetTicks();
 881 #if 0
 882         uint64_t cpuCycles = GetCurrentV65C02Clock();
 883         uint32_t cyclesBurned = (uint32_t)(cpuCycles - lastCPUCycles);
 884         WriteLog("FrameCallback: used %i cycles\n", cyclesBurned);
 885         lastCPUCycles = cpuCycles
 886 #endif
 887
 888 //let's wait, then signal...
 889 //works longer, but then still falls behind...
 890 #ifdef THREADED_65C02
 891         if (!pauseMode)
 892                 SDL_CondSignal(cpuCond);//OK, let the CPU go another frame...
 893 #endif
 894 }
 895
 896
 897 static void BlinkTimer(void)
 898 {
 899         flash = !flash;
 900         SetCallbackTime(BlinkTimer, 250000);            // Set up blinking at 1/4 sec intervals
 901 }
 902
 903
 904 /*
 905 Next problem is this: How to have events occur and synchronize with the rest
 906 of the threads?
 907
 908   o Have the CPU thread manage the timer mechanism? (need to have a method of carrying
 909     remainder CPU cycles over...)
 910
 911 One way would be to use a fractional accumulator, then subtract 1 every
 912 time it overflows. Like so:
 913
 914 double overflow = 0;
 915 uint32_t time = 20;
 916 while (!done)
 917 {
 918         Execute6808(&soundCPU, time);
 919         overflow += 0.289115646;
 920         if (overflow > 1.0)
 921         {
 922                 overflow -= 1.0;
 923                 time = 21;
 924         }
 925         else
 926                 time = 20;
 927 }
 928 */