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[ark-physics-kit] feat: separate sync to and update systems
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| import Foundation | ||
|
|
||
| /** | ||
| * A system which syncs from the physics world. | ||
| */ | ||
| class ArkPhysicsSyncSystem: UpdateSystem { | ||
| var active: Bool | ||
| var scene: AbstractArkPhysicsScene? | ||
| var eventManager: ArkEventManager | ||
| var arkECS: ArkECS | ||
| weak var sceneUpdateDelegate: ArkPhysicsContactUpdateDelegate? | ||
|
|
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| init(simulator: AbstractPhysicsArkSimulator, | ||
| eventManager: ArkEventManager, | ||
| arkECS: ArkECS, | ||
| active: Bool = true) { | ||
| self.active = active | ||
| self.scene = simulator.physicsScene | ||
| self.eventManager = eventManager | ||
| self.arkECS = arkECS | ||
| } | ||
|
|
||
| func update(deltaTime: TimeInterval, arkECS: ArkECS) { | ||
| } | ||
|
|
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| private func getPhysicsComponents(_ arkECS: ArkECS) -> [(Entity, PhysicsComponent)] { | ||
| arkECS.getEntities(with: [PhysicsComponent.self]).compactMap { entity in | ||
| guard let physicsComponent = arkECS.getComponent(ofType: PhysicsComponent.self, for: entity) else { | ||
| return nil | ||
| } | ||
| return (entity, physicsComponent) | ||
| } | ||
| } | ||
|
|
||
| func syncFromPhysicsEngine() { | ||
| let syncStrategies: [ComponentSyncing] = [PhysicsComponentSync(), | ||
| PositionComponentSync(), | ||
| RotationComponentSync()] | ||
|
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| scene?.forEachEntity(perform: { entity, physicsBody in | ||
| syncStrategies.forEach { strategy in | ||
| strategy.sync(entity: entity, with: physicsBody, using: self.arkECS) | ||
| } | ||
| }) | ||
| } | ||
|
|
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| // MARK: Impulse application | ||
| func apply(impulse: CGVector, to entity: Entity, arkECS: ArkECS) { | ||
| guard var physicsComponent: PhysicsComponent = | ||
| arkECS.getComponent(ofType: PhysicsComponent.self, for: entity) else { | ||
| return | ||
| } | ||
| physicsComponent.impulse = impulse | ||
| arkECS.upsertComponent(physicsComponent, to: entity) | ||
| } | ||
|
|
||
| func apply(angularImpulse: CGFloat, to entity: Entity, arkECS: ArkECS) { | ||
| guard var physicsComponent: PhysicsComponent = | ||
| arkECS.getComponent(ofType: PhysicsComponent.self, for: entity) else { | ||
| return | ||
| } | ||
| physicsComponent.angularImpulse = angularImpulse | ||
| arkECS.upsertComponent(physicsComponent, to: entity) | ||
| } | ||
|
|
||
| // MARK: Handle Collision | ||
| func handleCollisionBegan(between entityA: Entity, and entityB: Entity) { | ||
| let arkCollisionEvent = makeCollisionEvent(ArkCollisionBeganEvent.self, entityA, entityB) | ||
| self.eventManager.emit(arkCollisionEvent) | ||
| } | ||
|
|
||
| func handleCollisionEnd(between entityA: Entity, and entityB: Entity) { | ||
| let arkCollisionEvent = makeCollisionEvent(ArkCollisionEndedEvent.self, entityA, entityB) | ||
| self.eventManager.emit(arkCollisionEvent) | ||
| } | ||
|
|
||
| private func makeCollisionEvent<T: ArkCollisionEventProtocol> (_ eventType: T.Type, | ||
| _ entityA: Entity, | ||
| _ entityB: Entity) -> T { | ||
| let entityACategoryBitMask = scene?.getPhysicsBody(for: entityA)?.categoryBitMask ?? 0 | ||
| let entityBCategoryBitMask = scene?.getPhysicsBody(for: entityB)?.categoryBitMask ?? 0 | ||
| let arkCollisionEvent = T(eventData: ArkCollisionEventData( | ||
| entityA: entityA, | ||
| entityACategoryBitMask: entityACategoryBitMask, | ||
| entityB: entityB, | ||
| entityBCategoryBitMask: entityBCategoryBitMask), | ||
| priority: 0) | ||
| return arkCollisionEvent | ||
| } | ||
| } | ||
|
|
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| extension ArkPhysicsSyncSystem: ArkPhysicsContactUpdateDelegate { | ||
| func didContactBegin(between entityA: Entity, and entityB: Entity) { | ||
| handleCollisionBegan(between: entityA, and: entityB) | ||
| } | ||
|
|
||
| func didContactEnd(between entityA: Entity, and entityB: Entity) { | ||
| handleCollisionEnd(between: entityA, and: entityB) | ||
| } | ||
| } | ||
|
|
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| extension ArkPhysicsSyncSystem: ArkPhysicsSceneUpdateLoopDelegate { | ||
| func update(_ deltaTime: TimeInterval) { | ||
| syncFromPhysicsEngine() | ||
| } | ||
| } | ||
|
|
||
| protocol ArkCollisionEventProtocol: ArkEvent { | ||
| init(eventData: ArkCollisionEventData, priority: Int?) | ||
| } | ||
|
|
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| struct ArkCollisionEventData: ArkEventData { | ||
| var name = "" | ||
| var entityA: Entity | ||
| var entityACategoryBitMask: UInt32 | ||
| var entityB: Entity | ||
| var entityBCategoryBitMask: UInt32 | ||
| } | ||
|
|
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| struct ArkCollisionEndedEvent: ArkCollisionEventProtocol { | ||
| static var id = UUID() | ||
| var eventData: ArkCollisionEventData | ||
| var priority: Int? | ||
|
|
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| init(eventData: ArkCollisionEventData, priority: Int? = 10) { | ||
| self.eventData = eventData | ||
| } | ||
| } | ||
|
|
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| struct ArkCollisionBeganEvent: ArkCollisionEventProtocol { | ||
| static var id = UUID() | ||
| var eventData: ArkCollisionEventData | ||
| var priority: Int? | ||
|
|
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| init(eventData: ArkCollisionEventData, priority: Int? = 10) { | ||
| self.eventData = eventData | ||
| self.priority = priority | ||
| } | ||
| } | ||
|
|
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| protocol ComponentSyncing { | ||
| func sync(entity: Entity, with physicsBody: AbstractArkPhysicsBody, using arkECS: ArkECS) | ||
| } | ||
|
|
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| struct PhysicsComponentSync: ComponentSyncing { | ||
| func sync(entity: Entity, with physicsBody: AbstractArkPhysicsBody, using arkECS: ArkECS) { | ||
| guard var physicsComponent: PhysicsComponent = | ||
| arkECS.getComponent(ofType: PhysicsComponent.self, for: entity) else { | ||
| return } | ||
| physicsComponent.velocity = physicsBody.velocity | ||
| physicsComponent.mass = physicsBody.mass | ||
| physicsComponent.affectedByGravity = physicsBody.affectedByGravity | ||
| physicsComponent.linearDamping = physicsBody.linearDamping | ||
| physicsComponent.isDynamic = physicsBody.isDynamic | ||
| physicsComponent.allowsRotation = physicsBody.allowsRotation | ||
| physicsComponent.restitution = physicsBody.restitution | ||
| physicsComponent.friction = physicsBody.friction | ||
|
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| physicsComponent.categoryBitMask = physicsBody.categoryBitMask | ||
| physicsComponent.contactTestBitMask = physicsBody.contactTestBitMask | ||
| physicsComponent.collisionBitMask = physicsBody.collisionBitMask | ||
| arkECS.upsertComponent(physicsComponent, to: entity) | ||
| } | ||
| } | ||
|
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| struct PositionComponentSync: ComponentSyncing { | ||
| func sync(entity: Entity, with physicsBody: AbstractArkPhysicsBody, using arkECS: ArkECS) { | ||
| guard let positionComponent: PositionComponent = | ||
| arkECS.getComponent(ofType: PositionComponent.self, for: entity) else { | ||
| return } | ||
| var newPositionComp = positionComponent | ||
| newPositionComp.position = physicsBody.position | ||
| arkECS.upsertComponent(newPositionComp, to: entity) | ||
| } | ||
| } | ||
|
|
||
| struct RotationComponentSync: ComponentSyncing { | ||
| func sync(entity: Entity, with physicsBody: AbstractArkPhysicsBody, using arkECS: ArkECS) { | ||
| guard var rotationComponent: RotationComponent = | ||
| arkECS.getComponent(ofType: RotationComponent.self, for: entity) else { | ||
| return } | ||
| rotationComponent.angleInRadians = physicsBody.zRotation | ||
| arkECS.upsertComponent(rotationComponent, to: entity) | ||
| } | ||
| } |
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