mlange-42 / arche / 12169480381 / 1

Source File

100.0

/ecs/archetype.go

package ecs

import (
        "math"
        "reflect"
        "unsafe"

        "github.com/mlange-42/arche/ecs/stats"
)

const layoutChunkSize uint8 = 16

// layoutSize is the size of an archetype column layout in bytes.
var layoutSize uint32 = uint32(unsafe.Sizeof(layout{}))

// Helper for accessing data from an archetype
type archetypeAccess struct {
        basePointer          unsafe.Pointer // Pointer to the first component column layout.
        entityPointer        unsafe.Pointer // Pointer to the entity storage
        Mask                 Mask           // Archetype's mask
        RelationTarget       Entity         // Target entity of the archetype (if it has a relation component)
        RelationComponent    ID             // Relation component of the archetype
        HasRelationComponent bool           // Whether the archetype has a relation
}

// GetEntity returns the entity at the given index
func (a *archetypeAccess) GetEntity(index uint32) Entity {
        return *(*Entity)(unsafe.Add(a.entityPointer, entitySize*index))
}

// Get returns the component with the given ID at the given index
func (a *archetypeAccess) Get(index uint32, id ID) unsafe.Pointer {
        return a.getLayout(id).Get(index)
}

// HasComponent returns whether the archetype contains the given component ID.
func (a *archetypeAccess) HasComponent(id ID) bool {
        return a.getLayout(id).pointer != nil
}

// HasRelation returns whether the archetype has a relation component.
func (a *archetypeAccess) HasRelation() bool {
        return a.HasRelationComponent
}

// GetLayout returns the column layout for a component.
func (a *archetypeAccess) getLayout(id ID) *layout {
        return (*layout)(unsafe.Add(a.basePointer, layoutSize*uint32(id.id)))
}

// layout specification of a component column.
type layout struct {
        pointer  unsafe.Pointer // Pointer to the first element in the component column.
        itemSize uint32         // Component/step size
}

// Get returns a pointer to the item at the given index.
func (l *layout) Get(index uint32) unsafe.Pointer {
        if l.pointer == nil {
                return nil
        }
        return unsafe.Add(l.pointer, l.itemSize*index)
}

// archetype represents an ECS archetype
type archetype struct {
        *archetypeData
        node            *archNode // Node in the archetype graph.
        archetypeAccess           // Access helper, passed to queries.
        len             uint32    // Current number of entities.
        cap             uint32    // Current capacity.
}

type archetypeData struct {
        entityBuffer reflect.Value   // Reflection array containing entity data.
        layouts      []layout        // Column layouts by ID.
        buffers      []reflect.Value // Reflection arrays containing component data.
        indices      idMap[uint32]   // Mapping from IDs to buffer indices.
        index        int32           // Index of the archetype in the world.
}

// Init initializes an archetype
func (a *archetype) Init(node *archNode, data *archetypeData, index int32, forStorage bool, layouts uint8, relation Entity) {
        if !node.IsActive {
                node.IsActive = true
        }

        a.archetypeData = data
        a.buffers = make([]reflect.Value, len(node.Ids))
        a.indices = newIDMap[uint32]()
        a.index = index
        a.layouts = make([]layout, layouts)

        cap := 1
        if forStorage {
                cap = int(node.capacityIncrement)
        }

        for i, id := range node.Ids {
                tp := node.Types[i]
                size, align := tp.Size(), uintptr(tp.Align())
                size = (size + (align - 1)) / align * align

                a.buffers[i] = reflect.New(reflect.ArrayOf(cap, tp)).Elem()
                a.layouts[id.id] = layout{
                        a.buffers[i].Addr().UnsafePointer(),
                        uint32(size),
                }
                a.indices.Set(id.id, uint32(i))
        }
        a.entityBuffer = reflect.New(reflect.ArrayOf(cap, entityType)).Elem()

        a.archetypeAccess = archetypeAccess{
                basePointer:          unsafe.Pointer(&a.layouts[0]),
                entityPointer:        a.entityBuffer.Addr().UnsafePointer(),
                Mask:                 node.Mask,
                RelationTarget:       relation,
                RelationComponent:    node.Relation,
                HasRelationComponent: node.HasRelation,
        }

        a.node = node

        a.len = 0
        a.cap = uint32(cap)
}

// Add adds an entity with optionally zeroed components to the archetype
func (a *archetype) Alloc(entity Entity) uint32 {
        idx := a.len
        a.extend(1)
        a.addEntity(idx, &entity)
        a.len++
        return idx
}

// AllocN allocates storage for the given number of entities.
func (a *archetype) AllocN(count uint32) {
        a.extend(count)
        a.len += count
}

// Remove removes an entity and its components from the archetype.
//
// Performs a swap-remove and reports whether a swap was necessary
// (i.e. not the last entity that was removed).
func (a *archetype) Remove(index uint32) bool {
        swapped := a.removeEntity(index)

        old := a.len - 1

        if index != old {
                for _, id := range a.node.Ids {
                        lay := a.getLayout(id)
                        size := lay.itemSize
                        if size == 0 {
                                continue
                        }
                        src := unsafe.Add(lay.pointer, old*size)
                        dst := unsafe.Add(lay.pointer, index*size)
                        a.copy(src, dst, size)
                }
        }

        // Zero the free memory to allow the garbage collector
        // to take into account pointers in the removed component.
        a.ZeroAll(old)
        a.len--

        return swapped
}

// ZeroAll resets a block of storage in all buffers.
func (a *archetype) ZeroAll(index uint32) {
        for _, id := range a.node.Ids {
                a.Zero(index, id)
        }
}

// Zero resets a block of storage in one buffer.
func (a *archetype) Zero(index uint32, id ID) {
        lay := a.getLayout(id)
        size := lay.itemSize
        if size == 0 {
                return
        }
        dst := unsafe.Add(lay.pointer, index*size)
        a.copy(a.node.zeroPointer, dst, size)
}

// SetEntity overwrites an entity
func (a *archetype) SetEntity(index uint32, entity Entity) {
        a.addEntity(index, &entity)
}

// Set overwrites a component with the data behind the given pointer
func (a *archetype) Set(index uint32, id ID, comp interface{}) unsafe.Pointer {
        lay := a.getLayout(id)
        dst := a.Get(index, id)
        size := lay.itemSize
        if size == 0 {
                return dst
        }
        rValue := reflect.ValueOf(comp)

        src := rValue.UnsafePointer()
        a.copy(src, dst, size)
        return dst
}

// SetPointer overwrites a component with the data behind the given pointer
func (a *archetype) SetPointer(index uint32, id ID, comp unsafe.Pointer) unsafe.Pointer {
        lay := a.getLayout(id)
        dst := a.Get(index, id)
        size := lay.itemSize
        if size == 0 {
                return dst
        }

        a.copy(comp, dst, size)
        return dst
}

// Reset removes all entities and components.
//
// Does NOT free the reserved memory.
func (a *archetype) Reset() {
        if a.len == 0 {
                return
        }
        a.len = 0
        for _, buf := range a.buffers {
                buf.SetZero()
        }
}

// Deactivate the archetype for later re-use.
func (a *archetype) Deactivate() {
        a.Reset()
        a.index = -1
}

// Activate reactivates a de-activated archetype.
func (a *archetype) Activate(target Entity, index int32) {
        a.index = index
        a.RelationTarget = target
}

func (a *archetype) ExtendLayouts(count uint8) {
        if len(a.layouts) >= int(count) {
                return
        }
        temp := a.layouts
        a.layouts = make([]layout, count)
        copy(a.layouts, temp)
        a.archetypeAccess.basePointer = unsafe.Pointer(&a.layouts[0])
}

// IsActive returns whether the archetype is active.
// Otherwise, it is eligible for re-use.
func (a *archetype) IsActive() bool {
        return a.index >= 0
}

// Components returns the component IDs for this archetype
func (a *archetype) Components() []ID {
        return a.node.Ids
}

// Len reports the number of entities in the archetype
func (a *archetype) Len() uint32 {
        return a.len
}

// Cap reports the current capacity of the archetype
func (a *archetype) Cap() uint32 {
        return a.cap
}

// Stats generates statistics for an archetype
func (a *archetype) Stats(reg *componentRegistry) stats.Archetype {
        ids := a.Components()
        aCompCount := len(ids)
        aTypes := make([]reflect.Type, aCompCount)
        for j, id := range ids {
                aTypes[j], _ = reg.ComponentType(id.id)
        }

        cap := int(a.Cap())
        memPerEntity := 0
        for _, id := range a.node.Ids {
                lay := a.getLayout(id)
                memPerEntity += int(lay.itemSize)
        }
        memory := cap * (int(entitySize) + memPerEntity)

        return stats.Archetype{
                IsActive: a.IsActive(),
                Size:     int(a.Len()),
                Capacity: cap,
                Memory:   memory,
        }
}

// UpdateStats updates statistics for an archetype
func (a *archetype) UpdateStats(node *stats.Node, stats *stats.Archetype, reg *componentRegistry) {
        cap := int(a.Cap())
        memory := cap * (int(entitySize) + node.MemoryPerEntity)

        stats.IsActive = a.IsActive()
        stats.Size = int(a.Len())
        stats.Capacity = cap
        stats.Memory = memory
}

// copy from one pointer to another.
func (a *archetype) copy(src, dst unsafe.Pointer, itemSize uint32) {
        dstSlice := (*[math.MaxInt32]byte)(dst)[:itemSize:itemSize]
        srcSlice := (*[math.MaxInt32]byte)(src)[:itemSize:itemSize]
        copy(dstSlice, srcSlice)
}

// extend the memory buffers if necessary for adding an entity.
func (a *archetype) extend(by uint32) {
        required := a.len + by
        if a.cap >= required {
                return
        }
        a.cap = capacityU32(required, a.node.capacityIncrement)

        old := a.entityBuffer
        a.entityBuffer = reflect.New(reflect.ArrayOf(int(a.cap), entityType)).Elem()
        a.entityPointer = a.entityBuffer.Addr().UnsafePointer()
        reflect.Copy(a.entityBuffer, old)

        for _, id := range a.node.Ids {
                lay := a.getLayout(id)
                if lay.itemSize == 0 {
                        continue
                }
                index, _ := a.indices.Get(id.id)
                old := a.buffers[index]
                a.buffers[index] = reflect.New(reflect.ArrayOf(int(a.cap), old.Type().Elem())).Elem()
                lay.pointer = a.buffers[index].Addr().UnsafePointer()
                reflect.Copy(a.buffers[index], old)
        }
}

// Adds an entity at the given index. Does not extend the entity buffer.
func (a *archetype) addEntity(index uint32, entity *Entity) {
        dst := unsafe.Add(a.entityPointer, entitySize*index)
        src := unsafe.Pointer(entity)
        a.copy(src, dst, entitySize)
}

// removeEntity removes an entity from tne archetype.
// Components need to be removed separately.
func (a *archetype) removeEntity(index uint32) bool {
        old := a.len - 1

        if index == old {
                return false
        }

        src := unsafe.Add(a.entityPointer, old*entitySize)
        dst := unsafe.Add(a.entityPointer, index*entitySize)
        a.copy(src, dst, entitySize)

        return true
}

1	package ecs
2
3	import (
4	"math"
5	"reflect"
6	"unsafe"
7
8	"github.com/mlange-42/arche/ecs/stats"
9	)
10
11	const layoutChunkSize uint8 = 16
12
13	// layoutSize is the size of an archetype column layout in bytes.
14	var layoutSize uint32 = uint32(unsafe.Sizeof(layout{}))
15
16	// Helper for accessing data from an archetype
17	type archetypeAccess struct {
18	basePointer unsafe.Pointer // Pointer to the first component column layout.
19	entityPointer unsafe.Pointer // Pointer to the entity storage
20	Mask Mask // Archetype's mask
21	RelationTarget Entity // Target entity of the archetype (if it has a relation component)
22	RelationComponent ID // Relation component of the archetype
23	HasRelationComponent bool // Whether the archetype has a relation
24	}
25
26	// GetEntity returns the entity at the given index
27	func (a *archetypeAccess) GetEntity(index uint32) Entity {	4,996,303✔
28	return (Entity)(unsafe.Add(a.entityPointer, entitySize*index))	4,996,303✔
29	}	4,996,303✔
30
31	// Get returns the component with the given ID at the given index
32	func (a *archetypeAccess) Get(index uint32, id ID) unsafe.Pointer {	1,505,933✔
33	return a.getLayout(id).Get(index)	1,505,933✔
34	}	1,505,933✔
35
36	// HasComponent returns whether the archetype contains the given component ID.
37	func (a *archetypeAccess) HasComponent(id ID) bool {	1,864✔
38	return a.getLayout(id).pointer != nil	1,864✔
39	}	1,864✔
40
41	// HasRelation returns whether the archetype has a relation component.
42	func (a *archetypeAccess) HasRelation() bool {	28,910✔
43	return a.HasRelationComponent	28,910✔
44	}	28,910✔
45
46	// GetLayout returns the column layout for a component.
47	func (a archetypeAccess) getLayout(id ID) layout {	2,558,125✔
48	return (layout)(unsafe.Add(a.basePointer, layoutSizeuint32(id.id)))	2,558,125✔
49	}	2,558,125✔
50
51	// layout specification of a component column.
52	type layout struct {
53	pointer unsafe.Pointer // Pointer to the first element in the component column.
54	itemSize uint32 // Component/step size
55	}
56
57	// Get returns a pointer to the item at the given index.
58	func (l *layout) Get(index uint32) unsafe.Pointer {	1,505,931✔
59	if l.pointer == nil {	1,505,932✔
60	return nil	1✔
61	}	1✔
62	return unsafe.Add(l.pointer, l.itemSize*index)	1,505,930✔
63	}
64
65	// archetype represents an ECS archetype
66	type archetype struct {
67	*archetypeData
68	node *archNode // Node in the archetype graph.
69	archetypeAccess // Access helper, passed to queries.
70	len uint32 // Current number of entities.
71	cap uint32 // Current capacity.
72	}
73
74	type archetypeData struct {
75	entityBuffer reflect.Value // Reflection array containing entity data.
76	layouts []layout // Column layouts by ID.
77	buffers []reflect.Value // Reflection arrays containing component data.
78	indices idMap[uint32] // Mapping from IDs to buffer indices.
79	index int32 // Index of the archetype in the world.
80	}
81
82	// Init initializes an archetype
83	func (a archetype) Init(node archNode, data *archetypeData, index int32, forStorage bool, layouts uint8, relation Entity) {	1,512✔
84	if !node.IsActive {	2,861✔
85	node.IsActive = true	1,349✔
86	}	1,349✔
87
88	a.archetypeData = data	1,512✔
89	a.buffers = make([]reflect.Value, len(node.Ids))	1,512✔
90	a.indices = newIDMap[uint32]()	1,512✔
91	a.index = index	1,512✔
92	a.layouts = make([]layout, layouts)	1,512✔
93		1,512✔
94	cap := 1	1,512✔
95	if forStorage {	2,884✔
96	cap = int(node.capacityIncrement)	1,372✔
97	}	1,372✔
98
99	for i, id := range node.Ids {	7,125✔
100	tp := node.Types[i]	5,613✔
101	size, align := tp.Size(), uintptr(tp.Align())	5,613✔
102	size = (size + (align - 1)) / align * align	5,613✔
103		5,613✔
104	a.buffers[i] = reflect.New(reflect.ArrayOf(cap, tp)).Elem()	5,613✔
105	a.layouts[id.id] = layout{	5,613✔
106	a.buffers[i].Addr().UnsafePointer(),	5,613✔
107	uint32(size),	5,613✔
108	}	5,613✔
109	a.indices.Set(id.id, uint32(i))	5,613✔
110	}	5,613✔
111	a.entityBuffer = reflect.New(reflect.ArrayOf(cap, entityType)).Elem()	1,512✔
112		1,512✔
113	a.archetypeAccess = archetypeAccess{	1,512✔
114	basePointer: unsafe.Pointer(&a.layouts[0]),	1,512✔
115	entityPointer: a.entityBuffer.Addr().UnsafePointer(),	1,512✔
116	Mask: node.Mask,	1,512✔
117	RelationTarget: relation,	1,512✔
118	RelationComponent: node.Relation,	1,512✔
119	HasRelationComponent: node.HasRelation,	1,512✔
120	}	1,512✔
121		1,512✔
122	a.node = node	1,512✔
123		1,512✔
124	a.len = 0	1,512✔
125	a.cap = uint32(cap)	1,512✔
126	}
127
128	// Add adds an entity with optionally zeroed components to the archetype
129	func (a *archetype) Alloc(entity Entity) uint32 {	529,801✔
130	idx := a.len	529,801✔
131	a.extend(1)	529,801✔
132	a.addEntity(idx, &entity)	529,801✔
133	a.len++	529,801✔
134	return idx	529,801✔
135	}	529,801✔
136
137	// AllocN allocates storage for the given number of entities.
138	func (a *archetype) AllocN(count uint32) {	27,636✔
139	a.extend(count)	27,636✔
140	a.len += count	27,636✔
141	}	27,636✔
142
143	// Remove removes an entity and its components from the archetype.
144	//
145	// Performs a swap-remove and reports whether a swap was necessary
146	// (i.e. not the last entity that was removed).
147	func (a *archetype) Remove(index uint32) bool {	524,429✔
148	swapped := a.removeEntity(index)	524,429✔
149		524,429✔
150	old := a.len - 1	524,429✔
151		524,429✔
152	if index != old {	1,042,529✔
153	for _, id := range a.node.Ids {	1,036,445✔
154	lay := a.getLayout(id)	518,345✔
155	size := lay.itemSize	518,345✔
156	if size == 0 {	518,654✔
157	continue	309✔
158	}
159	src := unsafe.Add(lay.pointer, old*size)	518,036✔
160	dst := unsafe.Add(lay.pointer, index*size)	518,036✔
161	a.copy(src, dst, size)	518,036✔
162	}
163	}
164
165	// Zero the free memory to allow the garbage collector
166	// to take into account pointers in the removed component.
167	a.ZeroAll(old)	524,429✔
168	a.len--	524,429✔
169		524,429✔
170	return swapped	524,429✔
171	}
172
173	// ZeroAll resets a block of storage in all buffers.
174	func (a *archetype) ZeroAll(index uint32) {	524,429✔
175	for _, id := range a.node.Ids {	1,047,212✔
176	a.Zero(index, id)	522,783✔
177	}	522,783✔
178	}
179
180	// Zero resets a block of storage in one buffer.
181	func (a *archetype) Zero(index uint32, id ID) {	522,783✔
182	lay := a.getLayout(id)	522,783✔
183	size := lay.itemSize	522,783✔
184	if size == 0 {	525,934✔
185	return	3,151✔
186	}	3,151✔
187	dst := unsafe.Add(lay.pointer, index*size)	519,632✔
188	a.copy(a.node.zeroPointer, dst, size)	519,632✔
189	}
190
191	// SetEntity overwrites an entity
192	func (a *archetype) SetEntity(index uint32, entity Entity) {	2,761,728✔
193	a.addEntity(index, &entity)	2,761,728✔
194	}	2,761,728✔
195
196	// Set overwrites a component with the data behind the given pointer
197	func (a *archetype) Set(index uint32, id ID, comp interface{}) unsafe.Pointer {	938✔
198	lay := a.getLayout(id)	938✔
199	dst := a.Get(index, id)	938✔
200	size := lay.itemSize	938✔
201	if size == 0 {	1,011✔
202	return dst	73✔
203	}	73✔
204	rValue := reflect.ValueOf(comp)	865✔
205		865✔
206	src := rValue.UnsafePointer()	865✔
207	a.copy(src, dst, size)	865✔
208	return dst	865✔
209	}
210
211	// SetPointer overwrites a component with the data behind the given pointer
212	func (a *archetype) SetPointer(index uint32, id ID, comp unsafe.Pointer) unsafe.Pointer {	8,071✔
213	lay := a.getLayout(id)	8,071✔
214	dst := a.Get(index, id)	8,071✔
215	size := lay.itemSize	8,071✔
216	if size == 0 {	13,450✔
217	return dst	5,379✔
218	}	5,379✔
219
220	a.copy(comp, dst, size)	2,692✔
221	return dst	2,692✔
222	}
223
224	// Reset removes all entities and components.
225	//
226	// Does NOT free the reserved memory.
227	func (a *archetype) Reset() {	52,552✔
228	if a.len == 0 {	77,609✔
229	return	25,057✔
230	}	25,057✔
231	a.len = 0	27,495✔
232	for _, buf := range a.buffers {	55,024✔
233	buf.SetZero()	27,529✔
234	}	27,529✔
235	}
236
237	// Deactivate the archetype for later re-use.
238	func (a *archetype) Deactivate() {	27,427✔
239	a.Reset()	27,427✔
240	a.index = -1	27,427✔
241	}	27,427✔
242
243	// Activate reactivates a de-activated archetype.
244	func (a *archetype) Activate(target Entity, index int32) {	27,404✔
245	a.index = index	27,404✔
246	a.RelationTarget = target	27,404✔
247	}	27,404✔
248
249	func (a *archetype) ExtendLayouts(count uint8) {	8✔
250	if len(a.layouts) >= int(count) {	10✔
251	return	2✔
252	}	2✔
253	temp := a.layouts	6✔
254	a.layouts = make([]layout, count)	6✔
255	copy(a.layouts, temp)	6✔
256	a.archetypeAccess.basePointer = unsafe.Pointer(&a.layouts[0])	6✔
257	}
258
259	// IsActive returns whether the archetype is active.
260	// Otherwise, it is eligible for re-use.
261	func (a *archetype) IsActive() bool {	5,102,573✔
262	return a.index >= 0	5,102,573✔
263	}	5,102,573✔
264
265	// Components returns the component IDs for this archetype
266	func (a *archetype) Components() []ID {	2,991✔
267	return a.node.Ids	2,991✔
268	}	2,991✔
269
270	// Len reports the number of entities in the archetype
271	func (a *archetype) Len() uint32 {	5,758,363✔
272	return a.len	5,758,363✔
273	}	5,758,363✔
274
275	// Cap reports the current capacity of the archetype
276	func (a *archetype) Cap() uint32 {	5,100,047✔
277	return a.cap	5,100,047✔
278	}	5,100,047✔
279
280	// Stats generates statistics for an archetype
281	func (a archetype) Stats(reg componentRegistry) stats.Archetype {	113✔
282	ids := a.Components()	113✔
283	aCompCount := len(ids)	113✔
284	aTypes := make([]reflect.Type, aCompCount)	113✔
285	for j, id := range ids {	225✔
286	aTypes[j], _ = reg.ComponentType(id.id)	112✔
287	}	112✔
288
289	cap := int(a.Cap())	113✔
290	memPerEntity := 0	113✔
291	for _, id := range a.node.Ids {	225✔
292	lay := a.getLayout(id)	112✔
293	memPerEntity += int(lay.itemSize)	112✔
294	}	112✔
295	memory := cap * (int(entitySize) + memPerEntity)	113✔
296		113✔
297	return stats.Archetype{	113✔
298	IsActive: a.IsActive(),	113✔
299	Size: int(a.Len()),	113✔
300	Capacity: cap,	113✔
301	Memory: memory,	113✔
302	}	113✔
303	}
304
305	// UpdateStats updates statistics for an archetype
306	func (a archetype) UpdateStats(node stats.Node, stats stats.Archetype, reg componentRegistry) {	5,099,924✔
307	cap := int(a.Cap())	5,099,924✔
308	memory := cap * (int(entitySize) + node.MemoryPerEntity)	5,099,924✔
309		5,099,924✔
310	stats.IsActive = a.IsActive()	5,099,924✔
311	stats.Size = int(a.Len())	5,099,924✔
312	stats.Capacity = cap	5,099,924✔
313	stats.Memory = memory	5,099,924✔
314	}	5,099,924✔
315
316	// copy from one pointer to another.
317	func (a *archetype) copy(src, dst unsafe.Pointer, itemSize uint32) {	4,850,854✔
318	dstSlice := (*[math.MaxInt32]byte)(dst)[:itemSize:itemSize]	4,850,854✔
319	srcSlice := (*[math.MaxInt32]byte)(src)[:itemSize:itemSize]	4,850,854✔
320	copy(dstSlice, srcSlice)	4,850,854✔
321	}	4,850,854✔
322
323	// extend the memory buffers if necessary for adding an entity.
324	func (a *archetype) extend(by uint32) {	557,440✔
325	required := a.len + by	557,440✔
326	if a.cap >= required {	1,114,803✔
327	return	557,363✔
328	}	557,363✔
329	a.cap = capacityU32(required, a.node.capacityIncrement)	77✔
330		77✔
331	old := a.entityBuffer	77✔
332	a.entityBuffer = reflect.New(reflect.ArrayOf(int(a.cap), entityType)).Elem()	77✔
333	a.entityPointer = a.entityBuffer.Addr().UnsafePointer()	77✔
334	reflect.Copy(a.entityBuffer, old)	77✔
335		77✔
336	for _, id := range a.node.Ids {	156✔
337	lay := a.getLayout(id)	79✔
338	if lay.itemSize == 0 {	86✔
339	continue	7✔
340	}
341	index, _ := a.indices.Get(id.id)	72✔
342	old := a.buffers[index]	72✔
343	a.buffers[index] = reflect.New(reflect.ArrayOf(int(a.cap), old.Type().Elem())).Elem()	72✔
344	lay.pointer = a.buffers[index].Addr().UnsafePointer()	72✔
345	reflect.Copy(a.buffers[index], old)	72✔
346	}
347	}
348
349	// Adds an entity at the given index. Does not extend the entity buffer.
350	func (a archetype) addEntity(index uint32, entity Entity) {	3,291,529✔
351	dst := unsafe.Add(a.entityPointer, entitySize*index)	3,291,529✔
352	src := unsafe.Pointer(entity)	3,291,529✔
353	a.copy(src, dst, entitySize)	3,291,529✔
354	}	3,291,529✔
355
356	// removeEntity removes an entity from tne archetype.
357	// Components need to be removed separately.
358	func (a *archetype) removeEntity(index uint32) bool {	524,429✔
359	old := a.len - 1	524,429✔
360		524,429✔
361	if index == old {	530,758✔
362	return false	6,329✔
363	}	6,329✔
364
365	src := unsafe.Add(a.entityPointer, old*entitySize)	518,100✔
366	dst := unsafe.Add(a.entityPointer, index*entitySize)	518,100✔
367	a.copy(src, dst, entitySize)	518,100✔
368		518,100✔
369	return true	518,100✔
370	}