From 395aa7d1c312e495517701be11c21425d9a5838e Mon Sep 17 00:00:00 2001
From: Elizabeth Hunt <me@liz.coffee>
Date: Sun, 26 Oct 2025 17:25:13 -0700
Subject: Checkpoint

---
 .../kotlin/coffee/liz/ecs/physics/PhysicsSystem.kt | 26 ++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 composeApp/src/commonMain/kotlin/coffee/liz/ecs/physics/PhysicsSystem.kt

(limited to 'composeApp/src/commonMain/kotlin/coffee/liz/ecs/physics/PhysicsSystem.kt')

diff --git a/composeApp/src/commonMain/kotlin/coffee/liz/ecs/physics/PhysicsSystem.kt b/composeApp/src/commonMain/kotlin/coffee/liz/ecs/physics/PhysicsSystem.kt
new file mode 100644
index 0000000..703e614
--- /dev/null
+++ b/composeApp/src/commonMain/kotlin/coffee/liz/ecs/physics/PhysicsSystem.kt
@@ -0,0 +1,26 @@
+package coffee.liz.ecs.physics
+
+import coffee.liz.ecs.Entity
+import coffee.liz.ecs.TickedSystem
+import coffee.liz.ecs.World
+import kotlin.time.Duration
+
+internal fun interface CollisionResolver<Outside> {
+    fun resolveCollision(world: World<Outside>, a: Entity, b: Entity)
+}
+
+abstract class PhysicsSystem<Outside>(
+    physicsTickRate: Duration
+): TickedSystem<Outside>(physicsTickRate), CollisionResolver<Outside> {
+    private val integrationTick = IntegrationTick<Outside>()
+    private val collisionTick = CollisionTick(this)
+
+    abstract override fun resolveCollision(world: World<Outside>, a: Entity, b: Entity)
+
+    override fun update(world: World<Outside>, state: Outside, ticks: Int) {
+        for (tick in 1..ticks) {
+            collisionTick.runTick(world)
+            integrationTick.runTick(world)
+        }
+    }
+}
\ No newline at end of file
-- 
cgit v1.2.3-70-g09d2