making xinput to actually work (tested with xbone gamepad)

src/net/torvald/terrarum/controller/XinputControllerAdapter.kt

@@ -0,0 +1,78 @@
+package net.torvald.terrarum.controller
+
+import com.github.strikerx3.jxinput.XInputAxes
+import com.github.strikerx3.jxinput.XInputDevice
+import net.torvald.terrarum.AppLoader
+import kotlin.math.roundToInt
+
+/**
+ * Created by minjaesong on 2019-02-09.
+ */
+class XinputControllerAdapter(val c: XInputDevice): TerrarumController {
+
+    override fun getButton(index: Int): Boolean {
+        if (c.poll()) {
+            val button = c.components.buttons
+
+            return when (index) {
+                0 -> button.a
+                1 -> button.b
+                2 -> button.x
+                3 -> button.y
+                4 -> button.lShoulder
+                5 -> button.rShoulder
+                6 -> button.back
+                7 -> button.start
+                8 -> getAxis(4) >= AppLoader.gamepadDeadzone
+                9 -> getAxis(5) >= AppLoader.gamepadDeadzone
+                else -> throw UnsupportedOperationException("Unknown button: $index")
+            }
+        }
+        return false
+    }
+
+    override fun getAxis(index: Int): Float {
+        if (c.poll()) {
+            val axes = c.components.axes
+
+            return when (index) {
+                0 -> axes.ly
+                1 -> axes.lx
+                2 -> axes.ry
+                3 -> axes.rx
+                4 -> axes.lt
+                5 -> axes.rt
+                else -> throw UnsupportedOperationException("Unknown axis: $index")
+            }
+        }
+        return -1f
+    }
+
+    override fun getPov(): Int {
+        if (c.poll()) {
+            val axes = c.components.axes
+
+            return when (axes.dpad) {
+                XInputAxes.DPAD_CENTER -> 0
+                XInputAxes.DPAD_UP_LEFT -> TerrarumController.POV_NW
+                XInputAxes.DPAD_UP -> TerrarumController.POV_N
+                XInputAxes.DPAD_UP_RIGHT -> TerrarumController.POV_NE
+                XInputAxes.DPAD_RIGHT -> TerrarumController.POV_E
+                XInputAxes.DPAD_DOWN_RIGHT -> TerrarumController.POV_SE
+                XInputAxes.DPAD_DOWN -> TerrarumController.POV_S
+                XInputAxes.DPAD_DOWN_LEFT -> TerrarumController.POV_SW
+                XInputAxes.DPAD_LEFT -> TerrarumController.POV_W
+                else -> throw UnsupportedOperationException("Unknown pov: ${axes.dpad}")
+            }
+        }
+        return -1
+    }
+
+    override fun getName(): String {
+        return "(XInput Compatible)"
+    }
+
+    override fun setRumble(left: Float, right: Float) {
+        c.setVibration((left * 65535f).roundToInt(), (right * 65535f).roundToInt())
+    }
+}