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/*
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* C64_Be.h - Put the pieces together, Be specific stuff
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*
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* Frodo (C) 1994-1997,2002-2005 Christian Bauer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <KernelKit.h>
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#include <device/Joystick.h>
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#include <device/DigitalPort.h>
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#undef PROFILING
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/*
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* Constructor, system-dependent things
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*/
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void C64::c64_ctor1(void)
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{
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joy[0] = joy[1] = NULL;
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joy_geek_port[0] = joy_geek_port[1] = false;
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}
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void C64::c64_ctor2(void)
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{
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// Initialize joystick variables
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joy_minx = joy_miny = 32767;
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joy_maxx = joy_maxy = 0;
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// Initialize semaphores (initially acquired)
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pause_sem = create_sem(0, "Frodo Pause Semaphore");
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sound_sync_sem = create_sem(0, "Frodo Sound Sync Semaphore");
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// Preset speedometer start time
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start_time = system_time();
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}
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/*
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* Destructor, system-dependent things
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*/
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void C64::c64_dtor(void)
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{
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delete_sem(pause_sem);
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delete_sem(sound_sync_sem);
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}
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/*
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* Start main emulation thread
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*/
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void C64::Run(void)
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{
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// Reset chips
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TheCPU->Reset();
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TheSID->Reset();
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TheCIA1->Reset();
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TheCIA2->Reset();
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TheCPU1541->Reset();
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// Patch kernal IEC routines
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orig_kernal_1d84 = Kernal[0x1d84];
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orig_kernal_1d85 = Kernal[0x1d85];
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PatchKernal(ThePrefs.FastReset, ThePrefs.Emul1541Proc);
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// Start the CPU thread
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the_thread = spawn_thread(thread_invoc, "Frodo 6510", B_URGENT_DISPLAY_PRIORITY, this);
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thread_running = true;
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quit_thyself = false;
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have_a_break = false;
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resume_thread(the_thread);
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}
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/*
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* Stop main emulation thread
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*/
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void C64::Quit(void)
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{
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long ret;
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// Ask the thread to quit itself if it is running
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if (thread_running) {
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if (have_a_break)
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Resume();
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quit_thyself = true;
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wait_for_thread(the_thread, &ret);
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thread_running = false;
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}
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}
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/*
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* Pause main emulation thread
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*/
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void C64::Pause(void)
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{
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// Ask the thread to pause and wait for acknowledge
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if (thread_running && !have_a_break) {
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have_a_break = true;
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acquire_sem(pause_sem);
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TheSID->PauseSound();
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}
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}
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/*
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* Resume main emulation thread
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*/
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void C64::Resume(void)
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{
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if (thread_running && have_a_break) {
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have_a_break = false;
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release_sem(pause_sem);
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TheSID->ResumeSound();
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}
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}
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/*
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* Vertical blank: Poll keyboard and joysticks, update window
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*/
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void C64::VBlank(bool draw_frame)
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{
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bigtime_t elapsed_time;
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long speed_index;
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// To avoid deadlocks on quitting
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if (quit_thyself) return;
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// Pause requested?
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if (have_a_break) {
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release_sem(pause_sem); // Acknowledge pause
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acquire_sem(pause_sem); // Wait for resume
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}
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// Poll keyboard
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TheDisplay->PollKeyboard(TheCIA1->KeyMatrix, TheCIA1->RevMatrix, &joykey);
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// Poll joysticks
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TheCIA1->Joystick1 = poll_joystick(0);
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TheCIA1->Joystick2 = poll_joystick(1);
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if (ThePrefs.JoystickSwap) {
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uint8 tmp = TheCIA1->Joystick1;
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TheCIA1->Joystick1 = TheCIA1->Joystick2;
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TheCIA1->Joystick2 = tmp;
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}
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// Joystick keyboard emulation
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if (TheDisplay->NumLock())
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TheCIA1->Joystick1 &= joykey;
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else
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TheCIA1->Joystick2 &= joykey;
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// Count TOD clocks
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TheCIA1->CountTOD();
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TheCIA2->CountTOD();
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// Update window if needed
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if (draw_frame) {
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TheDisplay->Update();
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// Calculate time between VBlanks, display speedometer
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elapsed_time = system_time() - start_time;
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speed_index = 20000 * 100 * ThePrefs.SkipFrames / (elapsed_time + 1);
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// Limit speed to 100% if desired (20ms/frame)
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// If the SID emulation is on and no frames are skipped, synchronize to the SID
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if (ThePrefs.LimitSpeed && speed_index > 100) {
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if (ThePrefs.SIDType == SIDTYPE_DIGITAL && ThePrefs.SkipFrames == 1) {
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long l;
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get_sem_count(sound_sync_sem, &l);
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if (l > 0) // Avoid C64 lagging behind
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acquire_sem_etc(sound_sync_sem, l+1, 0, 0);
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else
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acquire_sem(sound_sync_sem);
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} else
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snooze(ThePrefs.SkipFrames * 20000 - elapsed_time);
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speed_index = 100;
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}
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start_time = system_time();
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TheDisplay->Speedometer(speed_index);
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}
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}
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/*
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* Called by SID after playing 1/50 sec of sound
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*/
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void C64::SoundSync(void)
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{
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release_sem(sound_sync_sem);
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}
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/*
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* Open/close joystick drivers given old and new state of
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* joystick preferences
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*/
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void C64::open_close_joystick(int port, int oldjoy, int newjoy)
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{
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if (oldjoy != newjoy) {
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joy_minx = joy_miny = 32767; // Reset calibration
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joy_maxx = joy_maxy = 0;
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if (joy[port]) {
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if (joy_geek_port[port]) {
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((BDigitalPort *)joy[port])->Close();
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delete (BDigitalPort *)joy[port];
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} else {
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((BJoystick *)joy[port])->Close();
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delete (BJoystick *)joy[port];
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}
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joy[port] = NULL;
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}
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switch (newjoy) {
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case 1:
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joy[port] = new BJoystick;
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((BJoystick *)joy[port])->Open("joystick1");
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joy_geek_port[port] = false;
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break;
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case 2:
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joy[port] = new BJoystick;
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((BJoystick *)joy[port])->Open("joystick2");
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joy_geek_port[port] = false;
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break;
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case 3:
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joy[port] = new BDigitalPort;
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((BDigitalPort *)joy[port])->Open("DigitalA");
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joy_geek_port[port] = true;
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break;
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case 4:
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joy[port] = new BDigitalPort;
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((BDigitalPort *)joy[port])->Open("DigitalB");
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joy_geek_port[port] = true;
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break;
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}
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}
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}
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void C64::open_close_joysticks(int oldjoy1, int oldjoy2, int newjoy1, int newjoy2)
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{
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open_close_joystick(0, oldjoy1, newjoy1);
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open_close_joystick(1, oldjoy2, newjoy2);
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}
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/*
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* Poll joystick port, return CIA mask
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*/
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uint8 C64::poll_joystick(int port)
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{
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uint8 j = 0xff;
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if (joy[port] == NULL)
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return j;
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if (joy_geek_port[port]) {
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// GeekPort
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uint8 val;
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if (((BDigitalPort *)joy[port])->Read(&val) == 1)
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j = val | 0xe0;
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} else {
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// Joystick port
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BJoystick *p = (BJoystick *)joy[port];
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if (p->Update() != B_ERROR) {
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if (p->horizontal > joy_maxx)
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joy_maxx = p->horizontal;
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if (p->horizontal < joy_minx)
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joy_minx = p->horizontal;
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if (p->vertical > joy_maxy)
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joy_maxy = p->vertical;
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if (p->vertical < joy_miny)
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joy_miny = p->vertical;
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if (!p->button1)
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j &= 0xef; // Button
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if (joy_maxx-joy_minx < 100 || joy_maxy-joy_miny < 100)
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return j;
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if (p->horizontal < (joy_minx + (joy_maxx-joy_minx)/3))
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j &= 0xf7; // Right
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else if (p->horizontal > (joy_minx + 2*(joy_maxx-joy_minx)/3))
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j &= 0xfb; // Left
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if (p->vertical < (joy_miny + (joy_maxy-joy_miny)/3))
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j &= 0xfd; // Down
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else if (p->vertical > (joy_miny + 2*(joy_maxy-joy_miny)/3))
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j &= 0xfe; // Up
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}
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}
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return j;
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}
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/*
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* The emulation's main loop
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*/
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long C64::thread_invoc(void *obj)
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{
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((C64 *)obj)->thread_func();
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return 0;
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}
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void C64::thread_func(void)
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{
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#ifdef PROFILING
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static bigtime_t vic_time_acc = 0;
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static bigtime_t sid_time_acc = 0;
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static bigtime_t cia_time_acc = 0;
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static bigtime_t cpu_time_acc = 0;
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#endif
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#ifdef FRODO_SC
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while (!quit_thyself) {
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// The order of calls is important here
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if (TheVIC->EmulateCycle())
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TheSID->EmulateLine();
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TheCIA1->CheckIRQs();
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TheCIA2->CheckIRQs();
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TheCIA1->EmulateCycle();
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TheCIA2->EmulateCycle();
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TheCPU->EmulateCycle();
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if (ThePrefs.Emul1541Proc) {
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TheCPU1541->CountVIATimers(1);
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if (!TheCPU1541->Idle)
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TheCPU1541->EmulateCycle();
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}
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CycleCounter++;
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#else
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while (!quit_thyself) {
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// The order of calls is important here
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#ifdef PROFILING
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bigtime_t start_time = system_time();
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#endif
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int cycles = TheVIC->EmulateLine();
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#ifdef PROFILING
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bigtime_t vic_time = system_time();
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#endif
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TheSID->EmulateLine();
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#ifdef PROFILING
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bigtime_t sid_time = system_time();
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#endif
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#if !PRECISE_CIA_CYCLES
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TheCIA1->EmulateLine(ThePrefs.CIACycles);
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TheCIA2->EmulateLine(ThePrefs.CIACycles);
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#endif
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#ifdef PROFILING
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bigtime_t cia_time = system_time();
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#endif
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if (ThePrefs.Emul1541Proc) {
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int cycles_1541 = ThePrefs.FloppyCycles;
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TheCPU1541->CountVIATimers(cycles_1541);
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if (!TheCPU1541->Idle) {
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// 1541 processor active, alternately execute
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// 6502 and 6510 instructions until both have
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// used up their cycles
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while (cycles >= 0 || cycles_1541 >= 0)
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if (cycles > cycles_1541)
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cycles -= TheCPU->EmulateLine(1);
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else
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cycles_1541 -= TheCPU1541->EmulateLine(1);
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} else
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TheCPU->EmulateLine(cycles);
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} else
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// 1541 processor disabled, only emulate 6510
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TheCPU->EmulateLine(cycles);
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#ifdef PROFILING
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bigtime_t cpu_time = system_time();
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vic_time_acc += vic_time - start_time;
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sid_time_acc += sid_time - vic_time;
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cia_time_acc += cia_time - sid_time;
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cpu_time_acc += cpu_time - cia_time;
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#endif
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#endif
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}
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#ifdef PROFILING
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bigtime_t total_time = vic_time_acc + sid_time_acc + cia_time_acc + cpu_time_acc;
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printf("VIC: %Ld\n", vic_time_acc * 100 / total_time);
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printf("SID: %Ld\n", sid_time_acc * 100 / total_time);
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printf("CIA: %Ld\n", cia_time_acc * 100 / total_time);
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printf("CPU: %Ld\n", cpu_time_acc * 100 / total_time);
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#endif
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}
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