Possible to reverse directions in gamepad mapping

mappings/default.conf

@@ -10,6 +10,15 @@ abs_ry = 4
 abs_throttle = 6
 abs_rudder = 7
 
+reverse_x = false
+reverse_y = false
+reverse_rx = false
+reverse_ry = false
+reverse_dpad_y = false
+reverse_dpad_x = false
+reverse_throttle = false
+reverse_rudder = false
+
 btn_south = 304
 btn_east = 305
 btn_north = 307

src/com/limelight/input/EvdevAbsolute.java

@@ -18,7 +18,9 @@ public class EvdevAbsolute {
 	private int avg;
 	private int range;
 	
-	public EvdevAbsolute(String filename, int axis) {
+	private boolean reverse;
+	
+	public EvdevAbsolute(String filename, int axis, boolean reverse) {
 		ByteBuffer buffer = ByteBuffer.allocate(6*4);
 		buffer.order(ByteOrder.nativeOrder());
 		byte[] data = buffer.array();
@@ -30,6 +32,8 @@ public class EvdevAbsolute {
 		int max = buffer.getInt();
 		avg = (min+max)/2;
 		range = max-avg;
+		
+		this.reverse = reverse;
 	}
 	
 	private int getRequest(int dir, int type, int nr, int size) {
@@ -42,7 +46,7 @@ public class EvdevAbsolute {
 	 * @return input value as short
 	 */
 	public short getShort(int value) {
-		return (short) ((value-avg) * range / Short.MAX_VALUE);
+		return (short) ((value-avg) * (reverse?-range:range) / Short.MAX_VALUE);
 	}
 	
 	/**
@@ -51,7 +55,7 @@ public class EvdevAbsolute {
 	 * @return input value as byte
 	 */
 	public byte getByte(int value) {
-		return (byte) ((value-avg) * range / Byte.MAX_VALUE);
+		return (byte) ((value-avg) * (reverse?-range:range) / Byte.MAX_VALUE);
 	}
 	
 	/**
@@ -59,11 +63,11 @@ public class EvdevAbsolute {
 	 * @param value received input
 	 * @return input value as direction
 	 */
-	public byte getDirection(int value) {
+	public int getDirection(int value) {
 		if (value>(avg+range/4))
-			return UP;
+			return (reverse?DOWN:UP);
 		else if (value<(avg-range/4))
-			return DOWN;
+			return (reverse?UP:DOWN);
 		else
 			return NONE;
 	}

src/com/limelight/input/EvdevHandler.java

@@ -50,14 +50,14 @@ public class EvdevHandler implements Runnable {
 		inputBuffer = ByteBuffer.allocate(EvdevConstants.MAX_STRUCT_SIZE_BYTES);
 		inputBuffer.order(ByteOrder.nativeOrder());
 		
-		absLX = new EvdevAbsolute(device, mapping.abs_x);
-		absLY = new EvdevAbsolute(device, mapping.abs_y);
-		absRX = new EvdevAbsolute(device, mapping.abs_rx);
-		absRY = new EvdevAbsolute(device, mapping.abs_ry);
-		absLT = new EvdevAbsolute(device, mapping.abs_rudder);
-		absRT = new EvdevAbsolute(device, mapping.abs_throttle);
-		absDX = new EvdevAbsolute(device, mapping.abs_dpad_x);
-		absDY = new EvdevAbsolute(device, mapping.abs_dpad_y);
+		absLX = new EvdevAbsolute(device, mapping.abs_x, mapping.reverse_x);
+		absLY = new EvdevAbsolute(device, mapping.abs_y, mapping.reverse_y);
+		absRX = new EvdevAbsolute(device, mapping.abs_rx, mapping.reverse_rx);
+		absRY = new EvdevAbsolute(device, mapping.abs_ry, mapping.reverse_ry);
+		absLT = new EvdevAbsolute(device, mapping.abs_rudder, mapping.reverse_rudder);
+		absRT = new EvdevAbsolute(device, mapping.abs_throttle, mapping.reverse_throttle);
+		absDX = new EvdevAbsolute(device, mapping.abs_dpad_x, mapping.reverse_dpad_x);
+		absDY = new EvdevAbsolute(device, mapping.abs_dpad_y, mapping.reverse_dpad_y);
 		
 		translator = new KeyboardTranslator(conn);
 	}

src/com/limelight/input/GamepadMapping.java

@@ -24,6 +24,11 @@ public class GamepadMapping {
 	public short abs_throttle = EvdevConstants.ABS_THROTTLE;
 	public short abs_rudder = EvdevConstants.ABS_RUDDER;
 	
+	public boolean reverse_x, reverse_y;
+	public boolean reverse_rx, reverse_ry;
+	public boolean reverse_dpad_y, reverse_dpad_x;
+	public boolean reverse_throttle, reverse_rudder;
+	
 	public short btn_south = EvdevConstants.BTN_SOUTH;
 	public short btn_east = EvdevConstants.BTN_EAST;
 	public short btn_north = EvdevConstants.BTN_NORTH;
@@ -48,8 +53,12 @@ public class GamepadMapping {
 		
 		for (Map.Entry entry:props.entrySet()) {
 			try {
-				Field field = this.getClass().getField(entry.getKey().toString());
-				field.setShort(this, Short.parseShort(entry.getValue().toString()));
+				String key = entry.getKey().toString();
+				Field field = this.getClass().getField(key);
+				if (key.startsWith("reverse_"))
+					field.setBoolean(this, Boolean.parseBoolean(entry.getValue().toString()));
+				else
+					field.setShort(this, Short.parseShort(entry.getValue().toString()));
 			} catch (NoSuchFieldException e) {
 				System.err.println("No mapping found named " + entry.getKey());
 			} catch (NumberFormatException e) {