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55 lines
1.1 KiB
Go
Executable File
55 lines
1.1 KiB
Go
Executable File
package entity
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type EntityFlag byte
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const (
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EntityFlag_None EntityFlag = 0
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EntityFlag_Alive EntityFlag = 1 << (iota - 1)
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)
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const (
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GenerationShiftBits = 64 - 8
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FlagsShiftBits = 64 - 16
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IndexBitMask = 0x00_00_FFFF_FFFF_FFFF
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)
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type Entity interface {
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baseEntity()
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GetHandle() EntityHandle
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}
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type EntityHandle uint64
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var _ Entity = &BaseEntity{}
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type BaseEntity struct {
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// Byte 1: Generation; Byte 2: Flags; Bytes 3-8: Index
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ID EntityHandle
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}
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func (be BaseEntity) baseEntity() {}
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func (be BaseEntity) GetHandle() EntityHandle {
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return be.ID
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}
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func (e *BaseEntity) HasFlag(ef EntityFlag) bool {
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return GetFlags(e.ID)&ef > 0
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}
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func GetGeneration(id EntityHandle) byte {
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return byte(id >> GenerationShiftBits)
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}
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func GetFlags(id EntityHandle) EntityFlag {
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return EntityFlag(id >> FlagsShiftBits)
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}
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func GetIndex(id EntityHandle) uint64 {
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return uint64(id & IndexBitMask)
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}
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func NewEntityId(generation byte, flags EntityFlag, index uint64) EntityHandle {
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return EntityHandle(index | (uint64(generation) << GenerationShiftBits) | (uint64(flags) << FlagsShiftBits))
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}
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