Entity generation changed from unit16 to uint32

CHANGELOG.md

@@ -18,6 +18,10 @@ This change was necessary to get the same performance as before, despite the mor
 * Adds functions `ComponentType(*World, ID) reflect.Type` and `ResourceType(*World, ID) reflect.Type` (#315)
 * Adds methods `World.Ids(Entity) []ID` and `Query.Ids() []ID` (#315)
 
+### Other
+
+* Entity generation data type changed from `uint16` to `uint32` (#317)
+
 ## [[v0.9.0]](https://github.com/mlange-42/arche/compare/v0.8.1...v0.9.0)
 
 ### Infrastructure

ecs/entity.go

@@ -22,7 +22,7 @@ var entityIndexSize uint32 = uint32(reflect.TypeOf(entityIndex{}).Size())
 // The zero value should be used to indicate "nil", and can be checked with [Entity.IsZero].
 type Entity struct {
 	id  eid    // Entity ID
-	gen uint16 // Entity generation
+	gen uint32 // Entity generation
 }
 
 // newEntity creates a new Entity.
@@ -31,7 +31,7 @@ func newEntity(id eid) Entity {
 }
 
 // newEntityGen creates a new Entity with a given generation.
-func newEntityGen(id eid, gen uint16) Entity {
+func newEntityGen(id eid, gen uint32) Entity {
 	return Entity{id, gen}
 }
 

ecs/pool.go

@@ -20,7 +20,7 @@ type entityPool struct {
 // newEntityPool creates a new, initialized Entity pool.
 func newEntityPool(capacityIncrement uint32) entityPool {
 	entities := make([]Entity, 1, capacityIncrement)
-	entities[0] = Entity{0, math.MaxUint16}
+	entities[0] = Entity{0, math.MaxUint32}
 	return entityPool{
 		entities:          entities,
 		next:              0,

ecs/pool_test.go

@@ -16,7 +16,7 @@ func TestEntityPool(t *testing.T) {
 	p := newEntityPool(128)
 
 	expectedAll := []Entity{newEntity(0), newEntity(1), newEntity(2), newEntity(3), newEntity(4), newEntity(5)}
-	expectedAll[0].gen = math.MaxUint16
+	expectedAll[0].gen = math.MaxUint32
 
 	for i := 0; i < 5; i++ {
 		_ = p.Get()