Applied ringbuff to resolv_tailored for reducing memory usage.

resolv_tailored/cell.go

@@ -2,8 +2,8 @@ package resolv
 
 // Cell is used to contain and organize Object information.
 type Cell struct {
-	X, Y    int       // The X and Y position of the cell in the Space - note that this is in Grid position, not World position.
-	Objects []*Object // The Objects that a Cell contains.
+	X, Y    int         // The X and Y position of the cell in the Space - note that this is in Grid position, not World position.
+	Objects *RingBuffer // The Objects that a Cell contains.
 }
 
 // newCell creates a new cell at the specified X and Y position. Should not be used directly.
@@ -11,25 +11,27 @@ func newCell(x, y int) *Cell {
 	return &Cell{
 		X:       x,
 		Y:       y,
-		Objects: []*Object{},
+		Objects: NewRingBuffer(16), // A single cell is so small thus wouldn't have many touching objects simultaneously
 	}
 }
 
 // register registers an object with a Cell. Should not be used directly.
 func (cell *Cell) register(obj *Object) {
 	if !cell.Contains(obj) {
-		cell.Objects = append(cell.Objects, obj)
+		cell.Objects.Put(obj)
 	}
 }
 
 // unregister unregisters an object from a Cell. Should not be used directly.
 func (cell *Cell) unregister(obj *Object) {
-
-	for i, o := range cell.Objects {
-
+	rb := cell.Objects
+	for i := rb.StFrameId; i < rb.EdFrameId; i++ {
+		o := rb.GetByFrameId(i).(*Object)
 		if o == obj {
-			cell.Objects[i] = cell.Objects[len(cell.Objects)-1]
-			cell.Objects = cell.Objects[:len(cell.Objects)-1]
+			// swap with the st element
+			rb.SetByFrameId(rb.GetByFrameId(rb.StFrameId), i)
+			// pop the current st element
+			rb.Pop()
 			break
 		}
 
@@ -39,7 +41,9 @@ func (cell *Cell) unregister(obj *Object) {
 
 // Contains returns whether a Cell contains the specified Object at its position.
 func (cell *Cell) Contains(obj *Object) bool {
-	for _, o := range cell.Objects {
+	rb := cell.Objects
+	for i := rb.StFrameId; i < rb.EdFrameId; i++ {
+		o := rb.GetByFrameId(i).(*Object)
 		if o == obj {
 			return true
 		}
@@ -49,7 +53,9 @@ func (cell *Cell) Contains(obj *Object) bool {
 
 // ContainsTags returns whether a Cell contains an Object that has the specified tag at its position.
 func (cell *Cell) ContainsTags(tags ...string) bool {
-	for _, o := range cell.Objects {
+	rb := cell.Objects
+	for i := rb.StFrameId; i < rb.EdFrameId; i++ {
+		o := rb.GetByFrameId(i).(*Object)
 		if o.HasTags(tags...) {
 			return true
 		}
@@ -59,5 +65,5 @@ func (cell *Cell) ContainsTags(tags ...string) bool {
 
 // Occupied returns whether a Cell contains any Objects at all.
 func (cell *Cell) Occupied() bool {
-	return len(cell.Objects) > 0
+	return 0 < cell.Objects.Cnt
 }