break up gameplay stuff

Sources/Voxelotl/Game.swift

@@ -0,0 +1,53 @@
+import simd
+
+struct Instance {
+  var position: SIMD3<Float> = .zero
+  var scale: SIMD3<Float>    = .one
+  var rotation: simd_quatf   = .identity
+  var color: SIMD4<Float>    = .one
+}
+
+class Game: GameDelegate {
+
+  private var fpsCalculator = FPSCalculator()
+  var camera = Camera(fov: 60, size: .one, range: 0.03...25)
+  var player = Player()
+  var projection: matrix_float4x4 = .identity
+
+  func fixedUpdate(_ time: GameTime) {
+    
+  }
+
+  func update(_ time: GameTime) {
+    let deltaTime = Float(time.delta.asFloat)
+    fpsCalculator.frame(deltaTime: time.delta) { fps in
+      print("FPS: \(fps)")
+    }
+
+    player.update(deltaTime: deltaTime)
+    camera.position = player.position
+    camera.rotation =
+      simd_quatf(angle: player.rotation.y, axis: .init(1, 0, 0)) *
+      simd_quatf(angle: player.rotation.x, axis: .init(0, 1, 0))
+  }
+
+  func draw(_ renderer: Renderer, _ time: GameTime) {
+    let totalTime = Float(time.total.asFloat)
+
+    let instances: [Instance] = [
+      Instance(
+        position: .init(0, sin(totalTime * 1.5) * 0.5, -2),
+        scale: .init(repeating: 0.25),
+        rotation: .init(angle: totalTime * 3.0, axis: .init(0, 1, 0)),
+        color: .init(0.5, 0.5, 1, 1)),
+      Instance(position: .init(0, -1, 0), scale: .init(10, 0.1, 10)),
+      Instance(position: .init(-2.5, 0, -3), color: .init(1, 0.5, 0.75, 1)),
+      Instance(position: .init(-2.5, -0.5, -5), color: .init(0.75, 1, 1, 1))
+    ]
+    renderer.batch(instances: instances, camera: self.camera)
+  }
+
+  func resize(_ size: Size<Int>) {
+    self.camera.setSize(size)
+  }
+}