Implement joystick rumble. #522

Call `rtcEnableRumble()` in the core if the rtc is enabled during ROM
loading.

On `systemCartridgeRumble(bool)` events from the core, set the state in
`wxSDLJoy` accordingly, to either rumbling or not rumbling based on the
boolean parameter.

On the `50ms` joystick poll events, use `SDL_JoystickRumble()` to enable
rumble on both the low and high frequencies at maximum for the poll time
of `50ms`, to be set or reset again on the next poll event.

Tested in Drill Dozer, rumbling is being activated. Will need testing
from users as well to see if this is implemented correctly.

Fix #522.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

src/wx/panel.cpp

@@ -226,7 +226,11 @@ void GameArea::LoadGame(const wxString& name)
 
         if (cfg->HasGroup(id)) {
             cfg->SetPath(id);
-            rtcEnable(cfg->Read(wxT("rtcEnabled"), rtcEnabled));
+            bool enable_rtc = cfg->Read(wxT("rtcEnabled"), rtcEnabled);
+
+            rtcEnable(enable_rtc);
+            rtcEnableRumble(enable_rtc);
+
             int fsz = cfg->Read(wxT("flashSize"), (long)0);
 
             if (fsz != 0x10000 && fsz != 0x20000)
@@ -247,6 +251,7 @@ void GameArea::LoadGame(const wxString& name)
             cfg->SetPath(wxT("/"));
         } else {
             rtcEnable(rtcEnabled);
+            rtcEnableRumble(rtcEnabled);
             flashSetSize(0x10000 << winFlashSize);
 
             if (cpuSaveType < 0 || cpuSaveType > 5)
@@ -269,6 +274,7 @@ void GameArea::LoadGame(const wxString& name)
         // this **MUST** be called **AFTER** setting sample rate because the core calls soundInit()
         soundSetThrottle(throttle);
         soundFiltering = (float)gopts.gba_sound_filter / 100.0f;
+
         CPUInit(gopts.gba_bios.mb_fn_str(), useBiosFileGBA);
 
         if (useBiosFileGBA && !useBios) {

src/wx/sys.cpp

@@ -458,7 +458,10 @@ uint32_t systemGetClock()
     return wxGetApp().timer.Time();
 }
 
-void systemCartridgeRumble(bool) {}
+void systemCartridgeRumble(bool b)
+{
+    wxGetApp().frame->SetJoystickRumble(b);
+}
 
 static uint8_t sensorDarkness = 0xE8; // total darkness (including daylight on rainy days)
 

src/wx/widgets/sdljoy.cpp

@@ -121,7 +121,7 @@ void wxSDLJoy::Add(int joy)
         joystate[joy].dev = SDL_JoystickOpen(joy);
 
     if (nosticks && joystate[joy].dev) {
-        Start(50);
+        Start(poll_time_ms);
         nosticks = false;
     }
 }
@@ -238,6 +238,16 @@ void wxSDLJoy::Notify()
 
                 joystate[i].curval[nax + nhat + j] = val;
             }
+
         }
     }
+
+    // do rumble only on device 0
+    SDL_Joystick* dev = joystate[0].dev;
+    if (dev) {
+        if (rumbling)
+            SDL_JoystickRumble(dev, 0xFFFF, 0xFFFF, poll_time_ms);
+        else
+            SDL_JoystickRumble(dev, 0, 0, 0);
+    }
 }

src/wx/widgets/wx/sdljoy.h

@@ -56,6 +56,9 @@ public:
     // 0 is returned if joy is invalid
     int GetNumButtons(int joy);
 
+    // true = currently rumbling, false = turn off rumbling
+    void SetRumble(bool b) { rumbling = b; }
+
     virtual ~wxSDLJoy();
 
 protected:
@@ -64,7 +67,9 @@ protected:
     wxSDLJoyState* joystate;
     wxEvtHandler* evthandler;
     bool nosticks;
+    bool rumbling = false;
     void Notify();
+    uint16_t poll_time_ms = 50;
 };
 
 enum {

src/wx/wxvbam.h

@@ -326,6 +326,8 @@ public:
 
     virtual bool DialogOpened() { return dialog_opened != 0; }
 
+    virtual void SetJoystickRumble(bool b) { joy.SetRumble(b); }
+
     // required for building from xrc
     DECLARE_DYNAMIC_CLASS(MainFrame);
     // required for event handling