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Improve entity flags+add freeListSize to registry

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This commit is contained in:
bloeys
2022-12-06 04:51:03 +04:00
parent 36488ead04
commit 23a6689346
2 changed files with 21 additions and 12 deletions
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13
entity/entity.go
View File

@ -3,9 +3,8 @@ package entity
type EntityFlag byte
const (
EntityFlag_Unknown EntityFlag = 0
EntityFlag_Dead EntityFlag = 1 << (iota - 1)
EntityFlag_Alive
EntityFlag_None EntityFlag = 0
EntityFlag_Alive EntityFlag = 1 << (iota - 1)
)
const (
@ -25,8 +24,8 @@ func GetGeneration(id uint64) byte {
return byte(id >> GenerationShiftBits)
}
func GetFlags(id uint64) byte {
return byte(id >> FlagsShiftBits)
func GetFlags(id uint64) EntityFlag {
return EntityFlag(id >> FlagsShiftBits)
}
func GetIndex(id uint64) uint64 {
@ -34,10 +33,10 @@ func GetIndex(id uint64) uint64 {
}
func (e *Entity) HasFlag(ef EntityFlag) bool {
return GetFlags(e.ID)&byte(ef) > 0
return GetFlags(e.ID)&ef > 0
}
func NewEntityId(generation, flags byte, index uint64) uint64 {
func NewEntityId(generation byte, flags EntityFlag, index uint64) uint64 {
return index | (uint64(generation) << GenerationShiftBits) | (uint64(flags) << FlagsShiftBits)
}

20
entity/registry.go
View File

@ -4,6 +4,12 @@ import (
"github.com/bloeys/nmage/assert"
)
var (
// The number of slots required to be in the free list before the free list
// is used for creating new entries
FreeListUsageThreshold uint32 = 20
)
type freeListitem struct {
EntityIndex uint64
nextFree *freeListitem
@ -12,7 +18,9 @@ type freeListitem struct {
type Registry struct {
EntityCount uint64
Entities []Entity
FreeList *freeListitem
FreeList *freeListitem
FreeListSize uint32
}
func (r *Registry) NewEntity() *Entity {
@ -22,17 +30,18 @@ func (r *Registry) NewEntity() *Entity {
entityToUseIndex := uint64(0)
var entityToUse *Entity = nil
if r.FreeList != nil {
if r.FreeList != nil && r.FreeListSize > FreeListUsageThreshold {
entityToUseIndex = r.FreeList.EntityIndex
entityToUse = &r.Entities[entityToUseIndex]
r.FreeList = r.FreeList.nextFree
r.FreeListSize--
} else {
for i := 0; i < len(r.Entities); i++ {
e := &r.Entities[i]
if GetFlags(e.ID) != byte(EntityFlag_Unknown) && !e.HasFlag(EntityFlag_Dead) {
if e.HasFlag(EntityFlag_Alive) {
continue
}
@ -47,7 +56,7 @@ func (r *Registry) NewEntity() *Entity {
}
r.EntityCount++
entityToUse.ID = NewEntityId(GetGeneration(entityToUse.ID)+1, byte(EntityFlag_Alive), entityToUseIndex)
entityToUse.ID = NewEntityId(GetGeneration(entityToUse.ID)+1, EntityFlag_Alive, entityToUseIndex)
assert.T(entityToUse.ID != 0, "Entity ID must not be zero")
return entityToUse
}
@ -78,12 +87,13 @@ func (r *Registry) FreeEntity(id uint64) {
eIndex := GetIndex(e.ID)
e.Comps = []Comp{}
e.ID = NewEntityId(GetGeneration(e.ID), byte(EntityFlag_Dead), eIndex)
e.ID = NewEntityId(GetGeneration(e.ID), EntityFlag_None, eIndex)
r.FreeList = &freeListitem{
EntityIndex: eIndex,
nextFree: r.FreeList,
}
r.FreeListSize++
}
func NewRegistry(size uint32) *Registry {