use uint8 for interp ids and add custom binary marshalers

esync/clisync/esync_client.go

@@ -82,7 +82,7 @@ func applyEntityDiff(world donburi.World, networkId esync.NetworkId, components
 			// interpolated component
 			if !entry.HasComponent(timeCacheComponent) {
 				donburi.Add(entry, timeCacheComponent, &timeCacheData{
-					history: make(map[uint][]componentTimeData),
+					history: make(map[uint8][]componentTimeData),
 				})
 			}
 

esync/clisync/interpolation.go

@@ -26,7 +26,7 @@ type componentTimeData struct {
 // component key and contains a list of historic values for that type.
 type timeCacheData struct {
 	// map[component key]historic values
-	history map[uint][]componentTimeData
+	history map[uint8][]componentTimeData
 }
 
 var (

esync/esync_shared.go

@@ -1,6 +1,8 @@
 package esync
 
 import (
+	"bytes"
+	"encoding/binary"
 	"reflect"
 	"unsafe"
 
@@ -12,21 +14,48 @@ import (
 var InterpComponent = donburi.NewComponentType[InterpData]()
 
 type InterpData struct {
-	Components []uint
+	Components []uint8
+}
+
+func (id *InterpData) MarshalBinary() ([]byte, error) {
+	var buf bytes.Buffer
+	buf.Grow(len(id.Components))
+
+	for i := range id.Components {
+		binary.Write(&buf, binary.LittleEndian, id.Components[i])
+	}
+
+	return buf.Bytes(), nil
+}
+
+func (id *InterpData) UnmarshalBinary(data []byte) error {
+	buf := bytes.NewReader(data)
+
+	id.Components = make([]uint8, buf.Len())
+	for i := 0; i < len(id.Components); i++ {
+		binary.Read(buf, binary.LittleEndian, &id.Components[i])
+	}
+
+	return nil
 }
 
 func NewInterpData(components ...donburi.IComponentType) *InterpData {
-	ids := []uint{}
+	ids := []uint8{}
 	for i := range components {
-		ids = append(ids, interpolated.LookupId(components[i].Typ()))
+		key := interpolated.LookupId(components[i].Typ())
+		if key == 0 {
+			continue
+		}
+
+		ids = append(ids, key)
 	}
 
 	return &InterpData{
 		Components: ids,
 	}
 }
 
-func (i *InterpData) ComponentKeys() []uint {
+func (i *InterpData) ComponentKeys() []uint8 {
 	return i.Components
 }
 
@@ -75,30 +104,30 @@ var (
 //			T: lerp(from.Y, to.Y, delta),
 //		}
 //	})
-func RegisterInterpolated[T any](id uint, comp *donburi.ComponentType[T], lerp LerpFn[T]) error {
+func RegisterInterpolated[T any](id uint8, comp *donburi.ComponentType[T], lerp LerpFn[T]) error {
 	return interpolated.RegisterInterpolatedComponent(id, comp, lerp)
 }
 
 // LookInterpId returns the interpolation ID for the given type, if not present
 // then 0 is returned.
-func LookupInterpId(typ reflect.Type) uint {
+func LookupInterpId(typ reflect.Type) uint8 {
 	return interpolated.LookupId(typ)
 }
 
 // LookupInterpType returns the component type for the given interpolation ID,
 // if not present then an empty reflect.Type is returned.
-func LookupInterpType(id uint) reflect.Type {
+func LookupInterpType(id uint8) reflect.Type {
 	return interpolated.LookupType(id)
 }
 
 // LookupInterpSetter returns the setter function for the given interpolation ID.
 // This should always be type [esync.LerpFn]
-func LookupInterpSetter(id uint) any {
+func LookupInterpSetter(id uint8) any {
 	return interpolated.LookupSetter(id)
 }
 
 // RegisteredInterpId returns true if the given interpolation ID is registered.
-func RegisteredInterpId(id uint) bool {
+func RegisteredInterpId(id uint8) bool {
 	return interpolated.RegisteredId(id)
 }
 

typemapper/componentmapper.go

@@ -22,20 +22,20 @@ type interpolatedComponentData struct {
 type ComponentMapper struct {
 	lock sync.Mutex
 
-	typeToId      map[reflect.Type]uint
-	idToComponent map[uint]interpolatedComponentData
+	typeToId      map[reflect.Type]uint8
+	idToComponent map[uint8]interpolatedComponentData
 }
 
 func NewComponentMapper() *ComponentMapper {
 	return &ComponentMapper{
-		typeToId:      make(map[reflect.Type]uint),
-		idToComponent: make(map[uint]interpolatedComponentData),
+		typeToId:      make(map[reflect.Type]uint8),
+		idToComponent: make(map[uint8]interpolatedComponentData),
 	}
 }
 
 // RegisterInterpolatedComponent registers the given component and setter with
 // the provided ID, note that these IDs don't interfere with the normal esync.Register
-func (c *ComponentMapper) RegisterInterpolatedComponent(id uint, comp donburi.IComponentType, lerp any) error {
+func (c *ComponentMapper) RegisterInterpolatedComponent(id uint8, comp donburi.IComponentType, lerp any) error {
 	if lerp == nil {
 		return fmt.Errorf("must provide lerp function: %w", ErrNilLerpFunction)
 	}
@@ -60,7 +60,7 @@ func (c *ComponentMapper) RegisterInterpolatedComponent(id uint, comp donburi.IC
 	return nil
 }
 
-func (c *ComponentMapper) LookupSetter(id uint) any {
+func (c *ComponentMapper) LookupSetter(id uint8) any {
 	c.lock.Lock()
 	defer c.lock.Unlock()
 
@@ -75,22 +75,22 @@ func (c *ComponentMapper) RegisteredType(typ reflect.Type) bool {
 	return ok
 }
 
-func (c *ComponentMapper) RegisteredId(id uint) bool {
+func (c *ComponentMapper) RegisteredId(id uint8) bool {
 	c.lock.Lock()
 	defer c.lock.Unlock()
 
 	_, ok := c.idToComponent[id]
 	return ok
 }
 
-func (c *ComponentMapper) LookupType(id uint) reflect.Type {
+func (c *ComponentMapper) LookupType(id uint8) reflect.Type {
 	c.lock.Lock()
 	defer c.lock.Unlock()
 
 	return c.idToComponent[id].typ.Typ()
 }
 
-func (c *ComponentMapper) LookupId(typ reflect.Type) uint {
+func (c *ComponentMapper) LookupId(typ reflect.Type) uint8 {
 	c.lock.Lock()
 	defer c.lock.Unlock()