Removed Add() method from System interface, added 2D culling.

culling.go

@@ -0,0 +1,99 @@
+package goga
+
+import (
+	"log"
+)
+
+const (
+	culling_2d_name = "culling2d"
+)
+
+type Cullable struct {
+	*Actor
+	*Pos2D
+}
+
+type Culling2D struct {
+	cullables []Cullable
+	viewport  Vec4
+}
+
+// Creates a new sprite culling system.
+// To update the viewport, call SetViewport().
+func NewCulling2D(x, y, width, height int) *Culling2D {
+	culling := &Culling2D{}
+	culling.cullables = make([]Cullable, 0)
+	culling.viewport = Vec4{float64(x), float64(y), float64(width), float64(height)}
+
+	return culling
+}
+
+// Sets the culling outer bounds.
+// Actors outside of this box won't be rendered.
+func (c *Culling2D) SetViewport(x, y, width, height int) {
+	c.viewport = Vec4{float64(x), float64(y), float64(width), float64(height)}
+}
+
+func (c *Culling2D) Cleanup() {}
+
+// Adds actor with Pos2D to the system.
+func (c *Culling2D) Add(actor *Actor, pos *Pos2D) bool {
+	id := actor.GetId()
+
+	for _, cull := range c.cullables {
+		if id == cull.Actor.GetId() {
+			return false
+		}
+	}
+
+	c.cullables = append(c.cullables, Cullable{actor, pos})
+
+	return true
+}
+
+// Removes actor with Pos2D from system.
+func (c *Culling2D) Remove(actor *Actor) bool {
+	return c.RemoveById(actor.GetId())
+}
+
+// Removes actor with Pos2D from system by ID.
+func (c *Culling2D) RemoveById(id ActorId) bool {
+	for i, cull := range c.cullables {
+		if cull.GetId() == id {
+			c.cullables = append(c.cullables[:i], c.cullables[i+1:]...)
+			return true
+		}
+	}
+
+	return false
+}
+
+// Removes all cullable objects.
+func (c *Culling2D) RemoveAll() {
+	c.cullables = make([]Cullable, 0)
+}
+
+// Returns number of cullable objects.
+func (c *Culling2D) Len() int {
+	return len(c.cullables)
+}
+
+func (c *Culling2D) GetName() string {
+	return culling_2d_name
+}
+
+// Updates visibility of all contained sprites.
+func (c *Culling2D) Update(delta float64) {
+	for i := range c.cullables {
+		if c.cullables[i].Pos.X > c.viewport.Z ||
+			c.cullables[i].Pos.X+c.cullables[i].Size.X < c.viewport.X ||
+			c.cullables[i].Pos.Y > c.viewport.W ||
+			c.cullables[i].Pos.Y+c.cullables[i].Size.Y < c.viewport.Y {
+			c.cullables[i].Visible = false
+			log.Print("h")
+		} else {
+			c.cullables[i].Visible = true
+			log.Print("s")
+		}
+	}
+}

game.go

@@ -227,6 +227,7 @@ func initGoga(width, height int) {
 	EnableAlphaBlending(true)
 	AddLoader(&PngLoader{gl.LINEAR, false})
 	AddSystem(NewSpriteRenderer(nil, nil, false))
+	AddSystem(NewCulling2D(0, 0, width, height))
 }
 
 func cleanup() {
@@ -296,13 +297,23 @@ func EnableAlphaBlending(enable bool) {
 	}
 }
 
-// Sets GL viewport.
+// Sets GL viewport and updates default resources and systems.
 func SetViewport(x, y, width, height int32) {
 	viewportWidth = int(width)
 	viewportHeight = int(height)
+
 	DefaultCamera.SetViewport(int(x), int(y), viewportWidth, viewportHeight)
 	DefaultCamera.CalcRatio()
 	DefaultCamera.CalcOrtho()
+
+	if culling2d := GetSystemByName(culling_2d_name); culling2d != nil {
+		system, ok := culling2d.(*Culling2D)
+
+		if ok {
+			system.SetViewport(int(x), int(y), viewportWidth, viewportHeight)
+		}
+	}
+
 	gl.Viewport(x, y, width, height)
 }
 

sprite.go

@@ -87,27 +87,23 @@ func (s *SpriteRenderer) Cleanup() {
 }
 
 // Adds sprite to the renderer.
-func (s *SpriteRenderer) Add(actor interface{}) bool {
-	sprite, ok := actor.(*Sprite)
+func (s *SpriteRenderer) Add(actor *Actor, pos *Pos2D, tex *Tex) bool {
+	id := actor.GetId()
 
-	if !ok {
-		return false
+	for _, sprite := range s.sprites {
+		if id == sprite.Actor.GetId() {
+			return false
+		}
 	}
 
-	s.sprites = append(s.sprites, *sprite)
+	s.sprites = append(s.sprites, Sprite{actor, pos, tex})
 
 	return true
 }
 
 // Removes sprite from renderer.
-func (s *SpriteRenderer) Remove(actor interface{}) bool {
-	sprite, ok := actor.(*Sprite)
-
-	if !ok {
-		return false
-	}
-
-	return s.RemoveById(sprite.Actor.GetId())
+func (s *SpriteRenderer) Remove(actor *Actor) bool {
+	return s.RemoveById(actor.GetId())
 }
 
 // Removes sprite from renderer by ID.

system.go

@@ -10,8 +10,7 @@ import ()
 type System interface {
 	Update(float64)
 	Cleanup()
-	Add(interface{}) bool
-	Remove(interface{}) bool
+	Remove(*Actor) bool
 	RemoveById(ActorId) bool
 	RemoveAll()
 	Len() int
@@ -76,34 +75,11 @@ func updateSystems(delta float64) {
 	}
 }
 
-// Takes an actor and tries to add it to all systems that accept it.
-// This maybe not as performant as directly adding it to the right system.
-// Returns true if it could be added to at least one system, else false.
-func AddActor(actor interface{}) bool {
-	accepted := false
-
-	for _, system := range systems {
-		if system.Add(actor) {
-			accepted = true
-		}
-	}
-
-	return accepted
-}
-
 // Removes an actor from all systems.
 // This maybe not as performant as directly removing it from the right system.
 // Returns true if it could be removed from at least one system, else false.
-func RemoveActor(actor interface{}) bool {
-	removed := false
-
-	for _, system := range systems {
-		if system.Remove(actor) {
-			removed = true
-		}
-	}
-
-	return removed
+func RemoveActor(actor *Actor) bool {
+	return RemoveActorById(actor.GetId())
 }
 
 // Removes an actor from all systems by ID.