game-maker selectable game update governor

src/net/torvald/terrarum/GameUpdateGovernor.kt

@@ -0,0 +1,53 @@
+package net.torvald.terrarum
+
+/**
+ * Created by minjaesong on 2022-12-25.
+ */
+interface GameUpdateGovernor {
+    /**
+     * @param tickInterval reciprocal of "tick rate" or "frame rate", depending on the type of the governor
+     * @param updateFunction what to do on `update`. Takes one argument that is delta-time
+     * @param renderFunction what to do on `render`. Takes one argument that is delta-time
+     */
+    fun update(deltaTime: Float, tickInterval: Second, updateFunction: (Float) -> Unit, renderFunction: (Float) -> Unit)
+    fun reset()
+}
+
+object Anarchy : GameUpdateGovernor {
+    override fun update(
+        deltaTime: Float,
+        tickInterval: Second,
+        updateFunction: (Float) -> Unit,
+        renderFunction: (Float) -> Unit
+    ) {
+        updateFunction(deltaTime)
+        renderFunction(deltaTime)
+    }
+
+    override fun reset() {
+    }
+}
+
+object LimitUpdateRate : GameUpdateGovernor {
+
+    private var akku = 0f
+
+    override fun update(deltaTime: Float, tickInterval: Second, updateFunction: (Float) -> Unit, renderFunction: (Float) -> Unit) {
+        akku += deltaTime
+
+        var i = 0L
+        while (akku >= tickInterval) {
+            App.measureDebugTime("Ingame.Update") { updateFunction(tickInterval) }
+            akku -= tickInterval
+            i += 1
+        }
+        App.setDebugTime("Ingame.UpdateCounter", i)
+
+        /** RENDER CODE GOES HERE */
+        App.measureDebugTime("Ingame.Render") { renderFunction(tickInterval) }
+    }
+
+    override fun reset() {
+        akku = 0f
+    }
+}