Introduce a BJoystick::GetButtonValues() function that aligns with the other

Get*Values() functions but retrieves an arbitrary amount of button states using
a boolean array. This overcomes the 32 button limitation on the API side. Right
now the function does simply set the first 32 states from the button bitmap, as
the BJoystick to driver interface hasn't been adapted yet.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41882 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/device/Joystick.h

@@ -64,6 +64,16 @@ public:
 
 			int32			CountButtons();
 			uint32			ButtonValues(int32 forStick = 0);
+								// Allows access to the first 32 buttons where
+								// each set bit indicates a pressed button.
+			status_t		GetButtonValues(bool* outButtons,
+								int32 forStick = 0);
+								// Haiku extension. Allows to retrieve the state
+								// of an arbitrary count of buttons. The
+								// outButtons argument is an array of boolean
+								// values with at least CountButtons() elements.
+								// True means the button is pressed and false
+								// means it is released.
 			status_t		GetButtonNameAt(int32 index,
 								BString* outName);
 

src/kits/device/Joystick.cpp

@@ -4,6 +4,7 @@
  * Distributed under the terms of the MIT License.
  */
 
+
 #include <Joystick.h>
 #include <JoystickTweaker.h>
 
@@ -433,6 +434,35 @@ BJoystick::ButtonValues(int32 forStick)
 }
 
 
+status_t
+BJoystick::GetButtonValues(bool *outButtons, int32 forStick)
+{
+	CALLED();
+
+	if (fJoystickInfo == NULL || fExtendedJoystick == NULL)
+		return B_NO_INIT;
+
+	if (forStick < 0
+		|| forStick >= (int32)fJoystickInfo->module_info.num_sticks)
+		return B_BAD_INDEX;
+
+	extended_joystick *extendedJoystick
+		= (extended_joystick *)fExtendedJoystick->ItemAt(forStick);
+	if (extendedJoystick == NULL)
+		return B_NO_INIT;
+
+	int16 buttonCount = fJoystickInfo->module_info.num_buttons;
+	for (int16 i = 0; i < buttonCount; i++) {
+		if (buttonCount >= 32)
+			outButtons[i] = false;
+		else
+			outButtons[i] = (extendedJoystick->buttons & (1 << i)) != 0;
+	}
+
+	return B_OK;
+}
+
+
 status_t
 BJoystick::GetButtonNameAt(int32 index, BString *outName)
 {