api/joy: prevent idempotent keypressed passed to receiver

2 files changed, 4 insertions, 1 deletions

diff --git a/opentrack/win32-joystick.cpp b/opentrack/win32-joystick.cpp
index f4bfba76..73e27f80 100644
--- a/opentrack/win32-joystick.cpp
+++ b/opentrack/win32-joystick.cpp
@@ -169,7 +169,7 @@ bool win32_joy_ctx::joy::poll(fn f)
     
     for (int i = 0; i < 128; i++)
     {
-        const bool state = !!(js.rgbButtons[i] & 0x80);
+        const bool state = !!(js.rgbButtons[i] & 0x80) && js.rgbButtons[i] != js_old.rgbButtons[i];
         if (state != pressed[i])
         {
             f(guid, i, state);
@@ -178,6 +178,8 @@ bool win32_joy_ctx::joy::poll(fn f)
         pressed[i] = state;
     }
     
+    js_old = js;
+    
     return true;
 }
 
diff --git a/opentrack/win32-joystick.hpp b/opentrack/win32-joystick.hpp
index e68ea2c6..df00aee7 100644
--- a/opentrack/win32-joystick.hpp
+++ b/opentrack/win32-joystick.hpp
@@ -76,6 +76,7 @@ private:
         QString guid, name;
         bool pressed[128];
         Timer first_timer;
+        DIJOYSTATE2 js_old;
 
         joy(LPDIRECTINPUTDEVICE8 handle, const QString& guid, const QString& name)
             : joy_handle(handle), guid(guid), name(name)