gdx 1.10/lwjgl3 migration; removing old Lua stuffs

src/net/torvald/terrarum/TerrarumScreenSize.kt

@@ -0,0 +1,48 @@
+package net.torvald.terrarum
+
+class TerrarumScreenSize(scrw: Int = defaultW, scrh: Int = defaultH) {
+
+    companion object {
+        const val minimumW = 1080
+        const val minimumH = 720
+        const val defaultW = 1280
+        const val defaultH = 720
+
+        const val TV_SAFE_GRAPHICS = 0.05f // as per EBU recommendation (https://tech.ebu.ch/docs/r/r095.pdf)
+        const val TV_SAFE_ACTION = 0.035f // as per EBU recommendation (https://tech.ebu.ch/docs/r/r095.pdf)
+    }
+
+    var screenW: Int = 0; private set
+    var screenH: Int = 0; private set
+    var screenWf: Float = 0f; private set
+    var screenHf: Float = 0f; private set
+    var halfScreenW: Int = 0; private set
+    var halfScreenH: Int = 0; private set
+    var halfScreenWf: Float = 0f; private set
+    var halfScreenHf: Float = 0f; private set
+    var aspectRatio: Float = 0f; private set
+
+
+
+    val tvSafeGraphicsWidth: Int; get() = Math.round(screenW * TV_SAFE_GRAPHICS)
+    val tvSafeGraphicsHeight: Int; get() = Math.round(screenH * TV_SAFE_GRAPHICS)
+    val tvSafeActionWidth: Int; get() = Math.round(screenW * TV_SAFE_ACTION)
+    val tvSafeActionHeight: Int; get() = Math.round(screenH * TV_SAFE_ACTION)
+
+    init {
+        setDimension(maxOf(minimumW, scrw), maxOf(minimumH, scrh))
+    }
+
+    fun setDimension(scrw: Int, scrh: Int) {
+        screenW = scrw and 0x7FFFFFFE
+        screenH = scrh and 0x7FFFFFFE
+        screenWf = scrw.toFloat()
+        screenHf = scrh.toFloat()
+        halfScreenW = screenW / 2
+        halfScreenH = screenH / 2
+        halfScreenWf = screenWf / 2f
+        halfScreenHf = screenHf / 2f
+        aspectRatio = screenWf / screenHf
+    }
+
+}