| 1 |
/* |
| 2 |
* C64_Amiga.h - Put the pieces together, Amiga specific stuff |
| 3 |
* |
| 4 |
* Frodo (C) 1994-1997,2002-2003 Christian Bauer |
| 5 |
* |
| 6 |
* This program is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU General Public License |
| 17 |
* along with this program; if not, write to the Free Software |
| 18 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 |
*/ |
| 20 |
|
| 21 |
#include <proto/exec.h> |
| 22 |
#include <proto/timer.h> |
| 23 |
|
| 24 |
|
| 25 |
// Library bases |
| 26 |
struct Device *TimerBase; |
| 27 |
|
| 28 |
|
| 29 |
/* |
| 30 |
* Constructor, system-dependent things |
| 31 |
*/ |
| 32 |
|
| 33 |
void C64::c64_ctor1(void) |
| 34 |
{ |
| 35 |
// Open game_io |
| 36 |
game_port = CreateMsgPort(); |
| 37 |
game_io = (struct IOStdReq *)CreateIORequest(game_port, sizeof(IOStdReq)); |
| 38 |
game_io->io_Message.mn_Node.ln_Type = NT_UNKNOWN; |
| 39 |
game_open = port_allocated = false; |
| 40 |
if (!OpenDevice("gameport.device", 1, (struct IORequest *)game_io, 0)) |
| 41 |
game_open = true; |
| 42 |
} |
| 43 |
|
| 44 |
void C64::c64_ctor2(void) |
| 45 |
{ |
| 46 |
// Initialize joystick variables |
| 47 |
joy_state = 0xff; |
| 48 |
|
| 49 |
// Open timer_io |
| 50 |
timer_port = CreateMsgPort(); |
| 51 |
timer_io = (struct timerequest *)CreateIORequest(timer_port, sizeof(struct timerequest)); |
| 52 |
OpenDevice(TIMERNAME, UNIT_MICROHZ, (struct IORequest *)timer_io, 0); |
| 53 |
|
| 54 |
// Get timer base |
| 55 |
TimerBase = timer_io->tr_node.io_Device; |
| 56 |
|
| 57 |
// Preset speedometer start time |
| 58 |
GetSysTime(&start_time); |
| 59 |
} |
| 60 |
|
| 61 |
|
| 62 |
/* |
| 63 |
* Destructor, system-dependent things |
| 64 |
*/ |
| 65 |
|
| 66 |
void C64::c64_dtor(void) |
| 67 |
{ |
| 68 |
// Stop and delete timer_io |
| 69 |
if (timer_io != NULL) { |
| 70 |
if (!CheckIO((struct IORequest *)timer_io)) |
| 71 |
WaitIO((struct IORequest *)timer_io); |
| 72 |
CloseDevice((struct IORequest *)timer_io); |
| 73 |
DeleteIORequest((struct IORequest *)timer_io); |
| 74 |
} |
| 75 |
|
| 76 |
if (timer_port != NULL) |
| 77 |
DeleteMsgPort(timer_port); |
| 78 |
|
| 79 |
if (game_open) { |
| 80 |
if (!CheckIO((struct IORequest *)game_io)) { |
| 81 |
AbortIO((struct IORequest *)game_io); |
| 82 |
WaitIO((struct IORequest *)game_io); |
| 83 |
} |
| 84 |
CloseDevice((struct IORequest *)game_io); |
| 85 |
} |
| 86 |
|
| 87 |
if (game_io != NULL) |
| 88 |
DeleteIORequest((struct IORequest *)game_io); |
| 89 |
|
| 90 |
if (game_port != NULL) |
| 91 |
DeleteMsgPort(game_port); |
| 92 |
} |
| 93 |
|
| 94 |
|
| 95 |
/* |
| 96 |
* Start emulation |
| 97 |
*/ |
| 98 |
|
| 99 |
void C64::Run(void) |
| 100 |
{ |
| 101 |
// Reset chips |
| 102 |
TheCPU->Reset(); |
| 103 |
TheSID->Reset(); |
| 104 |
TheCIA1->Reset(); |
| 105 |
TheCIA2->Reset(); |
| 106 |
TheCPU1541->Reset(); |
| 107 |
|
| 108 |
// Patch kernal IEC routines |
| 109 |
orig_kernal_1d84 = Kernal[0x1d84]; |
| 110 |
orig_kernal_1d85 = Kernal[0x1d85]; |
| 111 |
PatchKernal(ThePrefs.FastReset, ThePrefs.Emul1541Proc); |
| 112 |
|
| 113 |
// Start timer_io |
| 114 |
timer_io->tr_node.io_Command = TR_ADDREQUEST; |
| 115 |
timer_io->tr_time.tv_secs = 0; |
| 116 |
timer_io->tr_time.tv_micro = ThePrefs.SkipFrames * 20000; // 20ms per frame |
| 117 |
SendIO((struct IORequest *)timer_io); |
| 118 |
|
| 119 |
// Start the CPU thread |
| 120 |
thread_running = true; |
| 121 |
quit_thyself = false; |
| 122 |
have_a_break = false; |
| 123 |
thread_func(); |
| 124 |
} |
| 125 |
|
| 126 |
|
| 127 |
/* |
| 128 |
* Stop emulation |
| 129 |
*/ |
| 130 |
|
| 131 |
void C64::Quit(void) |
| 132 |
{ |
| 133 |
// Ask the thread to quit itself if it is running |
| 134 |
if (thread_running) { |
| 135 |
quit_thyself = true; |
| 136 |
thread_running = false; |
| 137 |
} |
| 138 |
} |
| 139 |
|
| 140 |
|
| 141 |
/* |
| 142 |
* Pause emulation |
| 143 |
*/ |
| 144 |
|
| 145 |
void C64::Pause(void) |
| 146 |
{ |
| 147 |
TheSID->PauseSound(); |
| 148 |
} |
| 149 |
|
| 150 |
|
| 151 |
/* |
| 152 |
* Resume emulation |
| 153 |
*/ |
| 154 |
|
| 155 |
void C64::Resume(void) |
| 156 |
{ |
| 157 |
TheSID->ResumeSound(); |
| 158 |
} |
| 159 |
|
| 160 |
|
| 161 |
/* |
| 162 |
* Vertical blank: Poll keyboard and joysticks, update window |
| 163 |
*/ |
| 164 |
|
| 165 |
void C64::VBlank(bool draw_frame) |
| 166 |
{ |
| 167 |
struct timeval end_time; |
| 168 |
long speed_index; |
| 169 |
|
| 170 |
// Poll keyboard |
| 171 |
TheDisplay->PollKeyboard(TheCIA1->KeyMatrix, TheCIA1->RevMatrix, &joykey); |
| 172 |
|
| 173 |
// Poll joysticks |
| 174 |
TheCIA1->Joystick1 = poll_joystick(0); |
| 175 |
TheCIA1->Joystick2 = poll_joystick(1); |
| 176 |
|
| 177 |
if (ThePrefs.JoystickSwap) { |
| 178 |
uint8 tmp = TheCIA1->Joystick1; |
| 179 |
TheCIA1->Joystick1 = TheCIA1->Joystick2; |
| 180 |
TheCIA1->Joystick2 = tmp; |
| 181 |
} |
| 182 |
|
| 183 |
// Joystick keyboard emulation |
| 184 |
if (TheDisplay->NumLock()) |
| 185 |
TheCIA1->Joystick1 &= joykey; |
| 186 |
else |
| 187 |
TheCIA1->Joystick2 &= joykey; |
| 188 |
|
| 189 |
// Count TOD clocks |
| 190 |
TheCIA1->CountTOD(); |
| 191 |
TheCIA2->CountTOD(); |
| 192 |
|
| 193 |
// Update window if needed |
| 194 |
if (draw_frame) { |
| 195 |
TheDisplay->Update(); |
| 196 |
|
| 197 |
// Calculate time between VBlanks, display speedometer |
| 198 |
GetSysTime(&end_time); |
| 199 |
SubTime(&end_time, &start_time); |
| 200 |
speed_index = 20000 * 100 * ThePrefs.SkipFrames / (end_time.tv_micro + 1); |
| 201 |
|
| 202 |
// Abort timer_io if speed limiter is off |
| 203 |
if (!ThePrefs.LimitSpeed) { |
| 204 |
if (!CheckIO((struct IORequest *)timer_io)) |
| 205 |
AbortIO((struct IORequest *)timer_io); |
| 206 |
} else if (speed_index > 100) |
| 207 |
speed_index = 100; |
| 208 |
|
| 209 |
// Wait for timer_io (limit speed) |
| 210 |
WaitIO((struct IORequest *)timer_io); |
| 211 |
|
| 212 |
// Restart timer_io |
| 213 |
timer_io->tr_node.io_Command = TR_ADDREQUEST; |
| 214 |
timer_io->tr_time.tv_secs = 0; |
| 215 |
timer_io->tr_time.tv_micro = ThePrefs.SkipFrames * 20000; // 20ms per frame |
| 216 |
SendIO((struct IORequest *)timer_io); |
| 217 |
|
| 218 |
GetSysTime(&start_time); |
| 219 |
|
| 220 |
TheDisplay->Speedometer(speed_index); |
| 221 |
} |
| 222 |
} |
| 223 |
|
| 224 |
|
| 225 |
/* |
| 226 |
* Open/close joystick drivers given old and new state of |
| 227 |
* joystick preferences |
| 228 |
*/ |
| 229 |
|
| 230 |
void C64::open_close_joysticks(int oldjoy1, int oldjoy2, int newjoy1, int newjoy2) |
| 231 |
{ |
| 232 |
if (game_open && (oldjoy2 != newjoy2)) |
| 233 |
|
| 234 |
if (newjoy2) { // Open joystick |
| 235 |
joy_state = 0xff; |
| 236 |
port_allocated = false; |
| 237 |
|
| 238 |
// Allocate game port |
| 239 |
BYTE ctype; |
| 240 |
Forbid(); |
| 241 |
game_io->io_Command = GPD_ASKCTYPE; |
| 242 |
game_io->io_Data = &ctype; |
| 243 |
game_io->io_Length = 1; |
| 244 |
DoIO((struct IORequest *)game_io); |
| 245 |
|
| 246 |
if (ctype != GPCT_NOCONTROLLER) |
| 247 |
Permit(); |
| 248 |
else { |
| 249 |
ctype = GPCT_ABSJOYSTICK; |
| 250 |
game_io->io_Command = GPD_SETCTYPE; |
| 251 |
game_io->io_Data = &ctype; |
| 252 |
game_io->io_Length = 1; |
| 253 |
DoIO((struct IORequest *)game_io); |
| 254 |
Permit(); |
| 255 |
|
| 256 |
port_allocated = true; |
| 257 |
|
| 258 |
// Set trigger conditions |
| 259 |
game_trigger.gpt_Keys = GPTF_UPKEYS | GPTF_DOWNKEYS; |
| 260 |
game_trigger.gpt_Timeout = 65535; |
| 261 |
game_trigger.gpt_XDelta = 1; |
| 262 |
game_trigger.gpt_YDelta = 1; |
| 263 |
game_io->io_Command = GPD_SETTRIGGER; |
| 264 |
game_io->io_Data = &game_trigger; |
| 265 |
game_io->io_Length = sizeof(struct GamePortTrigger); |
| 266 |
DoIO((struct IORequest *)game_io); |
| 267 |
|
| 268 |
// Flush device buffer |
| 269 |
game_io->io_Command = CMD_CLEAR; |
| 270 |
DoIO((struct IORequest *)game_io); |
| 271 |
|
| 272 |
// Start reading joystick events |
| 273 |
game_io->io_Command = GPD_READEVENT; |
| 274 |
game_io->io_Data = &game_event; |
| 275 |
game_io->io_Length = sizeof(struct InputEvent); |
| 276 |
SendIO((struct IORequest *)game_io); |
| 277 |
} |
| 278 |
|
| 279 |
} else { // Close joystick |
| 280 |
|
| 281 |
// Abort game_io |
| 282 |
if (!CheckIO((struct IORequest *)game_io)) { |
| 283 |
AbortIO((struct IORequest *)game_io); |
| 284 |
WaitIO((struct IORequest *)game_io); |
| 285 |
} |
| 286 |
|
| 287 |
// Free game port |
| 288 |
if (port_allocated) { |
| 289 |
BYTE ctype = GPCT_NOCONTROLLER; |
| 290 |
game_io->io_Command = GPD_SETCTYPE; |
| 291 |
game_io->io_Data = &ctype; |
| 292 |
game_io->io_Length = 1; |
| 293 |
DoIO((struct IORequest *)game_io); |
| 294 |
|
| 295 |
port_allocated = false; |
| 296 |
} |
| 297 |
} |
| 298 |
} |
| 299 |
|
| 300 |
|
| 301 |
/* |
| 302 |
* Poll joystick port, return CIA mask |
| 303 |
*/ |
| 304 |
|
| 305 |
uint8 C64::poll_joystick(int port) |
| 306 |
{ |
| 307 |
if (port == 0) |
| 308 |
return 0xff; |
| 309 |
|
| 310 |
if (game_open && port_allocated) { |
| 311 |
|
| 312 |
// Joystick event arrived? |
| 313 |
while (GetMsg(game_port) != NULL) { |
| 314 |
|
| 315 |
// Yes, analyze event |
| 316 |
switch (game_event.ie_Code) { |
| 317 |
case IECODE_LBUTTON: // Button pressed |
| 318 |
joy_state &= 0xef; |
| 319 |
break; |
| 320 |
|
| 321 |
case IECODE_LBUTTON | IECODE_UP_PREFIX: // Button released |
| 322 |
joy_state |= 0x10; |
| 323 |
break; |
| 324 |
|
| 325 |
case IECODE_NOBUTTON: // Joystick moved |
| 326 |
if (game_event.ie_X == 1) |
| 327 |
joy_state &= 0xf7; // Right |
| 328 |
if (game_event.ie_X == -1) |
| 329 |
joy_state &= 0xfb; // Left |
| 330 |
if (game_event.ie_X == 0) |
| 331 |
joy_state |= 0x0c; |
| 332 |
if (game_event.ie_Y == 1) |
| 333 |
joy_state &= 0xfd; // Down |
| 334 |
if (game_event.ie_Y == -1) |
| 335 |
joy_state &= 0xfe; // Up |
| 336 |
if (game_event.ie_Y == 0) |
| 337 |
joy_state |= 0x03; |
| 338 |
break; |
| 339 |
} |
| 340 |
|
| 341 |
// Start reading the next event |
| 342 |
game_io->io_Command = GPD_READEVENT; |
| 343 |
game_io->io_Data = &game_event; |
| 344 |
game_io->io_Length = sizeof(struct InputEvent); |
| 345 |
SendIO((struct IORequest *)game_io); |
| 346 |
} |
| 347 |
return joy_state; |
| 348 |
|
| 349 |
} else |
| 350 |
return 0xff; |
| 351 |
} |
| 352 |
|
| 353 |
|
| 354 |
/* |
| 355 |
* The emulation's main loop |
| 356 |
*/ |
| 357 |
|
| 358 |
void C64::thread_func(void) |
| 359 |
{ |
| 360 |
while (!quit_thyself) { |
| 361 |
|
| 362 |
#ifdef FRODO_SC |
| 363 |
// The order of calls is important here |
| 364 |
if (TheVIC->EmulateCycle()) |
| 365 |
TheSID->EmulateLine(); |
| 366 |
TheCIA1->CheckIRQs(); |
| 367 |
TheCIA2->CheckIRQs(); |
| 368 |
TheCIA1->EmulateCycle(); |
| 369 |
TheCIA2->EmulateCycle(); |
| 370 |
TheCPU->EmulateCycle(); |
| 371 |
|
| 372 |
if (ThePrefs.Emul1541Proc) { |
| 373 |
TheCPU1541->CountVIATimers(1); |
| 374 |
if (!TheCPU1541->Idle) |
| 375 |
TheCPU1541->EmulateCycle(); |
| 376 |
} |
| 377 |
CycleCounter++; |
| 378 |
#else |
| 379 |
// The order of calls is important here |
| 380 |
int cycles = TheVIC->EmulateLine(); |
| 381 |
TheSID->EmulateLine(); |
| 382 |
#if !PRECISE_CIA_CYCLES |
| 383 |
TheCIA1->EmulateLine(ThePrefs.CIACycles); |
| 384 |
TheCIA2->EmulateLine(ThePrefs.CIACycles); |
| 385 |
#endif |
| 386 |
|
| 387 |
if (ThePrefs.Emul1541Proc) { |
| 388 |
int cycles_1541 = ThePrefs.FloppyCycles; |
| 389 |
TheCPU1541->CountVIATimers(cycles_1541); |
| 390 |
|
| 391 |
if (!TheCPU1541->Idle) { |
| 392 |
// 1541 processor active, alternately execute |
| 393 |
// 6502 and 6510 instructions until both have |
| 394 |
// used up their cycles |
| 395 |
while (cycles >= 0 || cycles_1541 >= 0) |
| 396 |
if (cycles > cycles_1541) |
| 397 |
cycles -= TheCPU->EmulateLine(1); |
| 398 |
else |
| 399 |
cycles_1541 -= TheCPU1541->EmulateLine(1); |
| 400 |
} else |
| 401 |
TheCPU->EmulateLine(cycles); |
| 402 |
} else |
| 403 |
// 1541 processor disabled, only emulate 6510 |
| 404 |
TheCPU->EmulateLine(cycles); |
| 405 |
#endif |
| 406 |
} |
| 407 |
} |
