Checkpoint

1 files changed, 25 insertions, 0 deletions

diff --git a/composeApp/src/commonMain/kotlin/coffee/liz/ecs/GameLoop.kt b/composeApp/src/commonMain/kotlin/coffee/liz/ecs/GameLoop.kt
new file mode 100644
index 0000000..713586d
--- /dev/null
+++ b/composeApp/src/commonMain/kotlin/coffee/liz/ecs/GameLoop.kt
@@ -0,0 +1,25 @@
+package coffee.liz.ecs
+
+import kotlin.time.Duration.Companion.nanoseconds
+
+abstract class GameLoop<Outside> {
+    private var world: World<Outside>? = null
+    private var lastUpdate: Long? = null
+
+    fun load(world: World<Outside>) {
+        this.world = world
+        this.lastUpdate = null
+    }
+
+    abstract fun render(world: World<Outside>)
+    abstract fun outsideState(): Outside
+
+    fun loop(now: Long) {
+        val world = this.world ?: error("World not loaded")
+        val outsideState = outsideState()
+        val dt = (now - (lastUpdate ?: now)).nanoseconds
+        world.update(outsideState, dt)
+        render(world)
+        lastUpdate = now
+    }
+}
\ No newline at end of file