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Copy pathecs.go
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429 lines (335 loc) · 8.42 KB
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package ecs
import (
"strconv"
"sync"
"sync/atomic"
)
type EntityID uint32
func (id EntityID) String() string {
return strconv.Itoa(int(id))
}
type ComponentID uint32
type Tag struct {
flags uint64 // limited to 64 components
inverse bool
}
func (tag Tag) matches(smallertag Tag) bool {
res := tag.flags&smallertag.flags == smallertag.flags
if smallertag.inverse {
return !res
}
return res
}
func (tag *Tag) binaryORInPlace(othertag Tag) *Tag {
tag.flags |= othertag.flags
return tag
}
func (tag *Tag) binaryNOTInPlace(othertag Tag) *Tag {
tag.flags ^= othertag.flags
return tag
}
func (tag Tag) clone() Tag {
return tag
}
func (tag Tag) Inverse(values ...bool) Tag {
clone := tag.clone()
inverse := true
if len(values) > 0 {
inverse = values[0]
}
clone.inverse = inverse
return clone
}
type View struct {
tag Tag
entities queryResultCollection
lock *sync.RWMutex
}
type queryResultCollection []*QueryResult
func (coll queryResultCollection) Entities() []*Entity {
res := make([]*Entity, len(coll))
for i, qr := range coll {
res[i] = qr.Entity
}
return res
}
func (v View) Get() queryResultCollection {
v.lock.RLock()
defer v.lock.RUnlock()
return v.entities
}
func (v *View) add(entity *Entity) {
v.lock.Lock()
v.entities = append(v.entities, entity.manager.GetEntityByID(
entity.ID,
v.tag,
))
v.lock.Unlock()
}
func (v *View) remove(entity *Entity) {
v.lock.RLock()
for i, qr := range v.entities {
if qr.Entity.ID == entity.ID {
maxbound := len(v.entities) - 1
v.entities[maxbound], v.entities[i] = v.entities[i], v.entities[maxbound]
v.entities = v.entities[:maxbound]
break
}
}
v.lock.RUnlock()
}
type Manager struct {
lock *sync.RWMutex
entityIdInc uint32
componentNumInc uint32 // limited to 64
entities []*Entity
entitiesByID map[EntityID]*Entity
components []*Component
views []*View
}
type Component struct {
id ComponentID
tag Tag
datalock *sync.RWMutex
data map[EntityID]interface{}
destructor func(entity *Entity, data interface{})
}
func (component *Component) SetDestructor(destructor func(entity *Entity, data interface{})) {
component.destructor = destructor
}
func (component Component) GetID() ComponentID {
return component.id
}
func (manager *Manager) CreateView(tagelements ...interface{}) *View {
tag := BuildTag(tagelements...)
view := &View{
tag: tag,
lock: &sync.RWMutex{},
}
entities := manager.Query(tag)
view.entities = make(queryResultCollection, len(entities))
manager.lock.Lock()
for i, entityresult := range entities {
view.entities[i] = entityresult
}
manager.views = append(manager.views, view)
manager.lock.Unlock()
return view
}
type Entity struct {
ID EntityID
tag Tag
manager *Manager
}
func (entity *Entity) GetID() EntityID {
return entity.ID
}
func NewManager() *Manager {
return &Manager{
entityIdInc: 0,
componentNumInc: 0,
entitiesByID: make(map[EntityID]*Entity),
lock: &sync.RWMutex{},
views: make([]*View, 0),
}
}
func BuildTag(elements ...interface{}) Tag {
tag := Tag{}
for _, element := range elements {
switch typedelement := element.(type) {
case *Component:
{
tag.binaryORInPlace(typedelement.tag)
}
case Tag:
{
tag.binaryORInPlace(typedelement)
}
default:
{
panic("Invalid type passed to BuildTag; accepts only <*Component> and <Tag> types.")
}
}
}
return tag
}
func (manager *Manager) NewEntity() *Entity {
nextid := ComponentID(atomic.AddUint32(&manager.componentNumInc, 1))
id := nextid - 1 // to start at 0
entity := &Entity{
ID: EntityID(id),
manager: manager,
}
manager.lock.Lock()
manager.entities = append(manager.entities, entity)
manager.entitiesByID[entity.ID] = entity
manager.lock.Unlock()
return entity
}
func (manager *Manager) NewComponent() *Component {
if manager.componentNumInc >= 63 {
panic("Component overflow (limited to 64)")
}
nextid := ComponentID(atomic.AddUint32(&manager.componentNumInc, 1))
id := nextid - 1 // to start at 0
tag := Tag{
flags: (1 << id), // set bit on position corresponding to component number
inverse: false,
}
component := &Component{
id: id,
tag: tag,
data: make(map[EntityID]interface{}),
datalock: &sync.RWMutex{},
}
manager.lock.Lock()
manager.components = append(manager.components, component)
manager.lock.Unlock()
return component
}
func (manager Manager) GetEntityByID(id EntityID, tagelements ...interface{}) *QueryResult {
manager.lock.RLock()
res, ok := manager.entitiesByID[id]
if !ok {
manager.lock.RUnlock()
return nil
}
tag := BuildTag(tagelements...)
components := manager.fetchComponentsForEntity(res, tag)
manager.lock.RUnlock()
if components == nil {
return nil
}
return &QueryResult{
Entity: res,
Components: components,
}
}
func (entity Entity) Matches(tag Tag) bool {
return entity.tag.matches(tag)
}
func (entity *Entity) AddComponent(component *Component, componentdata interface{}) *Entity {
component.datalock.Lock()
component.data[entity.ID] = componentdata
component.datalock.Unlock()
component.datalock.RLock()
tagbefore := entity.tag
entity.tag.binaryORInPlace(component.tag)
for _, view := range entity.manager.views {
if !tagbefore.matches(view.tag) && entity.tag.matches(view.tag) {
view.add(entity)
}
}
component.datalock.RUnlock()
return entity
}
func (entity *Entity) RemoveComponent(component *Component) *Entity {
if component.destructor != nil {
if data, ok := component.data[entity.ID]; ok {
component.destructor(entity, data)
}
}
component.datalock.Lock()
delete(component.data, entity.ID)
tagbefore := entity.tag
entity.tag.binaryNOTInPlace(component.tag)
for _, view := range entity.manager.views {
if tagbefore.matches(view.tag) && !entity.tag.matches(view.tag) {
view.remove(entity)
}
}
component.datalock.Unlock()
return entity
}
func (entity Entity) HasComponent(component *Component) bool {
return entity.tag.matches(component.tag)
}
func (entity Entity) GetComponentData(component *Component) (interface{}, bool) {
component.datalock.RLock()
data, ok := component.data[entity.ID]
component.datalock.RUnlock()
return data, ok
}
func (manager *Manager) DisposeEntities(entities ...*Entity) {
for _, entity := range entities {
manager.DisposeEntity(entity)
}
}
func (manager *Manager) DisposeEntity(entity interface{}) {
var typedentity *Entity
switch typeditem := entity.(type) {
case *QueryResult:
{
typedentity = typeditem.Entity
}
case QueryResult:
{
typedentity = typeditem.Entity
}
case *Entity:
{
typedentity = typeditem
}
default:
{
panic("Invalid type passed to DisposeEntity; accepts only <*QueryResult>, <QueryResult> and <*Entity> types.")
}
}
if typedentity == nil {
return
}
manager.lock.Lock()
for _, component := range manager.components {
if typedentity.HasComponent(component) {
typedentity.RemoveComponent(component)
}
}
delete(manager.entitiesByID, typedentity.ID)
manager.lock.Unlock()
}
type QueryResult struct {
Entity *Entity
Components map[*Component]interface{}
}
func (manager *Manager) fetchComponentsForEntity(entity *Entity, tag Tag) map[*Component]interface{} {
if !entity.tag.matches(tag) {
return nil
}
componentMap := make(map[*Component]interface{})
for _, component := range manager.components {
if tag.matches(component.tag) {
data, ok := entity.GetComponentData(component)
if !ok {
return nil // if one of the required components is not set, return nothing !
}
componentMap[component] = data
}
// fmt.Printf("-------------\n")
// fmt.Printf("%16b : %s\n", int64(tag), "tag")
// fmt.Printf("%16b : %s\n", int64(component.tag), "component.tag")
// fmt.Printf("%16b : %s\n", int64(entity.tag), "entity.tag")
// fmt.Printf("//////////////////\n")
}
return componentMap
}
func (manager *Manager) Query(tag Tag) queryResultCollection {
matches := make(queryResultCollection, 0)
manager.lock.RLock()
for _, entity := range manager.entities {
if entity.tag.matches(tag) {
componentMap := make(map[*Component]interface{})
for _, component := range manager.components {
if tag.matches(component.tag) {
data, _ := entity.GetComponentData(component)
componentMap[component] = data
}
}
matches = append(matches, &QueryResult{
Entity: entity,
Components: componentMap,
})
}
}
manager.lock.RUnlock()
return matches
}