Improve joystick button reset procedure

Android/jni/jnihooks.c

@@ -291,7 +291,7 @@ void Java_org_deadc0de_apple2ix_Apple2View_nativeRender(JNIEnv *env, jclass cls)
 void Java_org_deadc0de_apple2ix_Apple2Activity_nativeReboot(JNIEnv *env, jclass cls, jint resetState) {
     LOG("...");
     if (resetState) {
-        // joystick button settings should be balanced by c_joystick_reset() triggered on CPU thread
+        // joystick button settings should be balanced by joystick_reset() triggered on CPU thread
         if (resetState == 1) {
             run_args.joy_button0 = 0xff;
             run_args.joy_button1 = 0x0;

src/cpu-supp.c

@@ -662,7 +662,7 @@ void cpu65_uninterrupt(int reason) {
 }
 
 void cpu65_reboot(void) {
-    run_args.joy_button0 = 0xff; // OpenApple -- should be balanced by c_joystick_reset() triggers on CPU thread
+    run_args.joy_button0 = 0xff; // OpenApple -- should be balanced by joystick_reset() triggers on CPU thread
     cpu65_interrupt(ResetSig);
 }
 

src/interface.c

@@ -1089,7 +1089,7 @@ void c_interface_parameters()
         else if ((ch == kESC) || c_keys_is_interface_key(ch))
         {
             timing_initialize();
-            c_joystick_reset();
+            joystick_reset();
 #if !TESTING
             prefs_save();
 #endif
@@ -1183,7 +1183,7 @@ void c_interface_parameters()
             /* calibrate joystick */
             if ((ch == 13) && (option == OPT_CALIBRATE))
             {
-                c_joystick_reset();
+                joystick_reset();
                 c_calibrate_joystick();
                 c_interface_print_screen( screen );
             }
@@ -1246,7 +1246,7 @@ void c_interface_parameters()
                     ch = toupper(ch);
                     if (ch == 'Y')
                     {
-                        c_joystick_reset();
+                        joystick_reset();
                         cpu65_reboot();
                         c_interface_exit(ch);
                         break;

src/joystick.c

@@ -32,6 +32,11 @@ short joy_step = 1;
 bool joy_auto_recenter = false;
 #endif
 
+static struct {
+    video_frame_callback_fn frameCallback;
+    uint8_t frameCount;
+} joystickReset = { 0 };
+
 void (*joydriver_resetJoystick)(void) = NULL;
 
 static void joystick_prefsChanged(const char *domain) {
@@ -59,8 +64,13 @@ static void joystick_prefsChanged(const char *domain) {
 #endif
 }
 
-static __attribute__((constructor)) void _init_joystick(void) {
+static void _init_joystick(void) {
     prefs_registerListener(PREF_DOMAIN_JOYSTICK, &joystick_prefsChanged);
+    video_registerFrameCallback(&joystickReset.frameCallback);
+}
+
+static __attribute__((constructor)) void __init_joystick(void) {
+    emulator_registerStartupCallback(CTOR_PRIORITY_LATE, &_init_joystick);
 }
 
 #ifdef INTERFACE_CLASSIC
@@ -270,24 +280,24 @@ void c_calibrate_joystick()
 #endif // INTERFACE_CLASSIC
 
 #if !TESTING
-// HACK : avoid resetting joystick button values too quickly. This should allow for ClosedApple-Reset. (This is still a
-// race, but hopefully much less likely to trigger).
-static void *_joystick_resetDelayed(void *ctx) {
-    (void)ctx;
-    SCOPE_TRACE_INTERFACE("_joystick_resetDelayed");
+// NOTE : reset joystick buttons after a number of frames, which should allow for Open/Closed-Apple reset sequence.
+void _joystick_frameCallback(uint8_t textFlashCounter) {
+    (void)textFlashCounter;
 
-    // delay
-    sleep(1);
+    // When activated, this is called every video frame -- ~16.688 millis
 
-    run_args.joy_button0 = 0x0;
-    run_args.joy_button1 = 0x0;
+    ASSERT_ON_CPU_THREAD();
 
-    return NULL;
+    --joystickReset.frameCount;
+    if (joystickReset.frameCount == 0) {
+        run_args.joy_button0 = 0x0;
+        run_args.joy_button1 = 0x0;
+        joystickReset.frameCallback = NULL; // unlatch
+    }
 }
 #endif
 
-void c_joystick_reset(void)
-{
+void joystick_reset(void) {
     if (joydriver_resetJoystick) {
         joydriver_resetJoystick();
     }
@@ -297,10 +307,8 @@ void c_joystick_reset(void)
     run_args.joy_button0 = 0x0;
     run_args.joy_button1 = 0x0;
 #else
-    pthread_t pid;
-    int err = TEMP_FAILURE_RETRY(pthread_create(&pid, NULL, (void *)&_joystick_resetDelayed, (void *)NULL));
-    assert(!err);
-    pthread_detach(pid);
+    joystickReset.frameCount = 2; // >= 1 full frame of processing insures that reset is handled
+    joystickReset.frameCallback = &_joystick_frameCallback;
 #endif
 
     joy_x = HALF_JOY_RANGE;

src/joystick.h

@@ -43,7 +43,7 @@ extern bool joy_auto_recenter;
 extern short joy_step;
 #endif
 
-void c_joystick_reset(void);
+void joystick_reset(void);
 
 #ifdef INTERFACE_CLASSIC
 void c_calibrate_joystick(void);

src/video/glnode.c

@@ -134,7 +134,7 @@ static void _glnode_initGLUTPost(void) {
     glutSpecialUpFunc(gldriver_on_key_special_up);
     //glutMouseFunc(gldriver_mouse);
     //glutMotionFunc(gldriver_mouse_drag);
-    c_joystick_reset();
+    joystick_reset();
 }
 #endif
 

src/vm.c

@@ -1501,7 +1501,7 @@ void vm_initialize(void) {
     _initialize_tables();
     disk6_init();
     _initialize_iie_switches();
-    c_joystick_reset();
+    joystick_reset();
 }
 
 bool vm_saveState(StateHelper_s *helper) {