More code restructuring and system access functions.

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 0.2_beta
+
+* code restructuring
+* added system access functions (like GetSpriteRenderer())
+
 ## 0.1_beta
 
 * beta release

README.md

@@ -7,8 +7,8 @@ Game engine written in Go using OpenGL and GLFW. Mostly for 2D rendering, but al
 go-game requires OpenGL and GLFW. The following three steps install everything you need:
 
 ```
-go get github.com/go-gl/gl/v3.1-core/gl
+go get github.com/go-gl/gl/v3.2-core/gl
-go get github.com/go-gl/glfw/v3.1/glfw
+go get github.com/go-gl/glfw/v3.2/glfw
 go get github.com/DeKugelschieber/go-game
 ```
 

actor.go

@@ -1,5 +1,9 @@
 package goga
 
+var (
+	actorIdGen = ActorId(0)
+)
+
 // An actor ID is a unique integer,
 // which can be used to reference an actor.
 type ActorId uint64
@@ -10,10 +14,6 @@ type Actor struct {
 	id ActorId
 }
 
-var (
-	actorIdGen = ActorId(0)
-)
-
 // Creates a new basic actor with unique ID.
 func NewActor() *Actor {
 	actorIdGen++

culling.go

@@ -80,14 +80,14 @@ func (c *Culling2D) GetName() string {
 
 // Updates visibility of all contained sprites.
 func (c *Culling2D) Update(delta float64) {
-	for i := range c.cullables {
+	for _, cullable := range c.cullables {
-		if c.cullables[i].Pos.X > c.viewport.Z ||
+		if cullable.Pos.X > c.viewport.Z ||
-			c.cullables[i].Pos.X+c.cullables[i].Size.X < c.viewport.X ||
+			cullable.Pos.X+cullable.Size.X < c.viewport.X ||
-			c.cullables[i].Pos.Y > c.viewport.W ||
+			cullable.Pos.Y > c.viewport.W ||
-			c.cullables[i].Pos.Y+c.cullables[i].Size.Y < c.viewport.Y {
+			cullable.Pos.Y+cullable.Size.Y < c.viewport.Y {
-			c.cullables[i].Visible = false
+			cullable.Visible = false
 		} else {
-			c.cullables[i].Visible = true
+			cullable.Visible = true
 		}
 	}
 }

demo/input/input.go

@@ -33,20 +33,10 @@ func (g *Game) Setup() {
 	sprite.Size.X = sprite.Size.X / 4
 	sprite.Size.Y = sprite.Size.Y / 4
 	g.sprite = sprite
-	renderer, ok := goga.GetSystemByName("spriteRenderer").(*goga.SpriteRenderer)
+	renderer := goga.GetSpriteRenderer()
-
-	if !ok {
-		panic("Could not find renderer")
-	}
-
 	renderer.Add(sprite.Actor, sprite.Pos2D, sprite.Tex)
 
-	culling, ok := goga.GetSystemByName("culling2d").(*goga.Culling2D)
+	culling := goga.GetCulling2DSystem()
-
-	if !ok {
-		panic("Could not find culling")
-	}
-
 	culling.Add(sprite.Actor, sprite.Pos2D)
 
 	// register input listeners

demo/keyframe/keyframe.go

@@ -39,12 +39,7 @@ func (g *Game) Setup() {
 	sprite.KeyframeAnimation = goga.NewKeyframeAnimation(0, 7, true, 20)
 
 	// add to renderer
-	renderer, ok := goga.GetSystemByName("keyframeRenderer").(*goga.KeyframeRenderer)
+	renderer := goga.GetKeyframeRenderer()
-
-	if !ok {
-		panic("Could not find renderer")
-	}
-
 	renderer.Add(sprite.Actor, sprite.Pos2D, sprite.Tex, sprite.KeyframeSet, sprite.KeyframeAnimation)
 }
 

demo/model/model.go

@@ -36,12 +36,7 @@ func (g *Game) Setup() {
 	mesh := goga.NewMesh(ply.IndexBuffer, ply.VertexBuffer, ply.TexCoordBuffer)
 
 	model := goga.NewModel(mesh, tex)
-	renderer, ok := goga.GetSystemByName("modelRenderer").(*goga.ModelRenderer)
+	renderer := goga.GetModelRenderer()
-
-	if !ok {
-		panic("Could not find renderer")
-	}
-
 	renderer.Prepare(model)
 	renderer.Add(model.Actor, model.Pos3D, model.Tex, model.Mesh)
 	g.model = model

demo/sprite/sprite.go

@@ -26,20 +26,10 @@ func (g *Game) Setup() {
 	}
 
 	sprite := goga.NewSprite(tex)
-	renderer, ok := goga.GetSystemByName("spriteRenderer").(*goga.SpriteRenderer)
+	renderer := goga.GetSpriteRenderer()
-
-	if !ok {
-		panic("Could not find renderer")
-	}
-
 	renderer.Add(sprite.Actor, sprite.Pos2D, sprite.Tex)
 
-	culling, ok := goga.GetSystemByName("culling2d").(*goga.Culling2D)
+	culling := goga.GetCulling2DSystem()
-
-	if !ok {
-		panic("Could not find culling")
-	}
-
 	culling.Add(sprite.Actor, sprite.Pos2D)
 }
 

demo/text/text.go

@@ -45,12 +45,7 @@ func (g *Game) Setup() {
 	}
 
 	// setup renderer
-	renderer, ok := goga.GetSystemByName("textRenderer").(*goga.TextRenderer)
+	renderer := goga.GetTextRenderer()
-
-	if !ok {
-		panic("Could not find renderer")
-	}
-
 	renderer.Font = font
 
 	// create and add text

game.go

@@ -16,6 +16,20 @@ const (
 	default_exit_on_close = true
 )
 
+var (
+	running        = true
+	clearColor     = Vec4{}
+	clearBuffer    []uint32
+	viewportWidth  int
+	viewportHeight int
+
+	// Default resources
+	DefaultCamera     *Camera
+	Default2DShader   *Shader
+	Default3DShader   *Shader
+	DefaultTextShader *Shader
+)
+
 // If set in RunOptions, the function will be called on window resize.
 type ResizeCallback func(width, height int)
 
@@ -43,20 +57,6 @@ type Game interface {
 	Update(float64)
 }
 
-var (
-	running        = true
-	clearColor     = Vec4{}
-	clearBuffer    []uint32
-	viewportWidth  int
-	viewportHeight int
-
-	// Default resources
-	DefaultCamera     *Camera
-	Default2DShader   *Shader
-	Default3DShader   *Shader
-	DefaultTextShader *Shader
-)
-
 func init() {
 	// GL functions must be called from main thread,
 	// so we disable multithreading by the runtime here.

keyframe.go

@@ -14,44 +14,6 @@ type Keyframe struct {
 	Min, Max Vec2
 }
 
-// A set of keyframes making up an animation.
-type KeyframeSet struct {
-	Keyframes []Keyframe
-}
-
-// Keyframe animation component.
-// It has a start and an end frame, a play speed and option to loop.
-type KeyframeAnimation struct {
-	Start, End    int
-	Loop          bool
-	Speed         float64
-	Current       int
-	Interpolation float64
-}
-
-// An animated sprite is a sprite with keyframe animation information.
-// It will be updated and rendered by the KeyframeRenderer.
-type AnimatedSprite struct {
-	*Actor
-	*Pos2D
-	*Tex
-	*KeyframeSet
-	*KeyframeAnimation
-}
-
-// The keyframe renderer renders animated sprites.
-// It has a 2D position component, to move all sprites at once.
-type KeyframeRenderer struct {
-	Pos2D
-
-	Shader *Shader
-	Camera *Camera
-
-	sprites       []AnimatedSprite
-	index, vertex *VBO
-	vao           *VAO
-}
-
 // Creates a new single keyframe with texture VBO.
 func NewKeyframe(min, max Vec2) *Keyframe {
 	keyframe := &Keyframe{Min: min, Max: max}
@@ -74,6 +36,11 @@ func NewKeyframe(min, max Vec2) *Keyframe {
 	return keyframe
 }
 
+// A set of keyframes making up an animation.
+type KeyframeSet struct {
+	Keyframes []Keyframe
+}
+
 // Creates a new empty keyframe set with given size.
 func NewKeyframeSet() *KeyframeSet {
 	set := &KeyframeSet{}
@@ -88,11 +55,31 @@ func (s *KeyframeSet) Add(frame *Keyframe) int {
 	return len(s.Keyframes)
 }
 
+// Keyframe animation component.
+// It has a start and an end frame, a play speed and option to loop.
+type KeyframeAnimation struct {
+	Start, End    int
+	Loop          bool
+	Speed         float64
+	Current       int
+	Interpolation float64
+}
+
 // Creates a new keyframe animation with given start, end and loop.
 func NewKeyframeAnimation(start, end int, loop bool, speed float64) *KeyframeAnimation {
 	return &KeyframeAnimation{start, end, loop, speed, 0, 0}
 }
 
+// An animated sprite is a sprite with keyframe animation information.
+// It will be updated and rendered by the KeyframeRenderer.
+type AnimatedSprite struct {
+	*Actor
+	*Pos2D
+	*Tex
+	*KeyframeSet
+	*KeyframeAnimation
+}
+
 // Creates a new animated sprite.
 func NewAnimatedSprite(tex *Tex, set *KeyframeSet, width, height int) *AnimatedSprite {
 	sprite := &AnimatedSprite{}
@@ -114,6 +101,19 @@ func NewAnimatedSprite(tex *Tex, set *KeyframeSet, width, height int) *AnimatedS
 	return sprite
 }
 
+// The keyframe renderer renders animated sprites.
+// It has a 2D position component, to move all sprites at once.
+type KeyframeRenderer struct {
+	Pos2D
+
+	Shader *Shader
+	Camera *Camera
+
+	sprites       []AnimatedSprite
+	index, vertex *VBO
+	vao           *VAO
+}
+
 // Creates a new keyframe renderer using given shader and camera.
 // If shader and/or camera are nil, the default one will be used.
 func NewKeyframeRenderer(shader *Shader, camera *Camera) *KeyframeRenderer {
@@ -206,22 +206,22 @@ func (s *KeyframeRenderer) GetName() string {
 // Updates animation state and renders sprites.
 func (s *KeyframeRenderer) Update(delta float64) {
 	// update animation state
-	for i := range s.sprites {
+	for _, sprite := range s.sprites {
-		if s.sprites[i].KeyframeAnimation == nil {
+		if sprite.KeyframeAnimation == nil {
 			continue
 		}
 
-		s.sprites[i].Interpolation += delta * s.sprites[i].KeyframeAnimation.Speed
+		sprite.Interpolation += delta * sprite.KeyframeAnimation.Speed
 
-		if s.sprites[i].Interpolation > 1 {
+		if sprite.Interpolation > 1 {
-			s.sprites[i].Interpolation = 0
+			sprite.Interpolation = 0
-			s.sprites[i].Current++
+			sprite.Current++
 
-			if s.sprites[i].Current > s.sprites[i].KeyframeAnimation.End {
+			if sprite.Current > sprite.KeyframeAnimation.End {
-				if s.sprites[i].KeyframeAnimation.Loop {
+				if sprite.KeyframeAnimation.Loop {
-					s.sprites[i].Current = s.sprites[i].KeyframeAnimation.Start
+					sprite.Current = sprite.KeyframeAnimation.Start
 				} else {
-					s.sprites[i].Current = s.sprites[i].KeyframeAnimation.End
+					sprite.Current = sprite.KeyframeAnimation.End
 				}
 			}
 		}
@@ -233,17 +233,17 @@ func (s *KeyframeRenderer) Update(delta float64) {
 	s.Shader.SendUniform1i(Default_shader_2D_tex, 0)
 	s.vao.Bind()
 
-	for i := range s.sprites {
+	for _, sprite := range s.sprites {
-		if !s.sprites[i].Visible {
+		if !sprite.Visible {
 			continue
 		}
 
-		texCoord := s.sprites[i].KeyframeSet.Keyframes[s.sprites[i].Current].texCoord
+		texCoord := sprite.KeyframeSet.Keyframes[sprite.Current].texCoord
 		texCoord.Bind()
 		texCoord.AttribPointer(s.Shader.GetAttribLocation(Default_shader_2D_texcoord_attrib), 2, gl.FLOAT, false, 0)
 
-		s.Shader.SendMat3(Default_shader_2D_model, *s.sprites[i].CalcModel())
+		s.Shader.SendMat3(Default_shader_2D_model, *sprite.CalcModel())
-		s.sprites[i].Tex.Bind()
+		sprite.Tex.Bind()
 
 		gl.DrawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, nil)
 	}

loader.go

@@ -21,27 +21,6 @@ type PngLoader struct {
 	KeepData bool
 }
 
-// Standford ply file resource.
-type Ply struct {
-	name string
-	path string
-	ext  string
-
-	firstLine, data, hasVertex, hasTexCoord, hasNormal bool
-	elements, faces                                    int
-	indices                                            []uint32
-	vertices, texCoords, normals                       []float32
-
-	IndexBuffer, VertexBuffer, TexCoordBuffer, NormalBuffer *VBO
-}
-
-// Loads ply files and creates VBOs within the Ply resource.
-// The indices must be present as triangles.
-// Expected type is float32. If it fails to parse, it will panic.
-type PlyLoader struct {
-	VboUsage uint32
-}
-
 func (p *PngLoader) Load(file string) (Res, error) {
 	// load texture
 	imgFile, err := os.Open(file)
@@ -82,6 +61,27 @@ func (p *PngLoader) Ext() string {
 	return "png"
 }
 
+// Standford ply file resource.
+type Ply struct {
+	name string
+	path string
+	ext  string
+
+	firstLine, data, hasVertex, hasTexCoord, hasNormal bool
+	elements, faces                                    int
+	indices                                            []uint32
+	vertices, texCoords, normals                       []float32
+
+	IndexBuffer, VertexBuffer, TexCoordBuffer, NormalBuffer *VBO
+}
+
+// Loads ply files and creates VBOs within the Ply resource.
+// The indices must be present as triangles.
+// Expected type is float32. If it fails to parse, it will panic.
+type PlyLoader struct {
+	VboUsage uint32
+}
+
 // Drops contained GL buffers.
 func (p *Ply) Drop() {
 	if p.IndexBuffer != nil {

model.go

@@ -14,26 +14,6 @@ type Mesh struct {
 	Vao                     *VAO
 }
 
-// Model is an actor having a 3D position, a texture and a 3D mesh.
-type Model struct {
-	*Actor
-	*Pos3D
-	*Tex
-	*Mesh
-}
-
-// The model renderer is a system rendering models.
-// It has a 3D position component, to move all models at once.
-type ModelRenderer struct {
-	Pos3D
-
-	Shader *Shader
-	Camera *Camera
-	ortho  bool
-
-	models []Model
-}
-
 // Creates a new mesh with given GL buffers.
 // The VAO must be prepared by ModelRenderer.
 func NewMesh(index, vertex, texcoord *VBO) *Mesh {
@@ -56,6 +36,14 @@ func (m *Mesh) Drop() {
 	m.Vao.Drop()
 }
 
+// Model is an actor having a 3D position, a texture and a 3D mesh.
+type Model struct {
+	*Actor
+	*Pos3D
+	*Tex
+	*Mesh
+}
+
 // Creates a new model with given mesh and texture.
 func NewModel(mesh *Mesh, tex *Tex) *Model {
 	model := &Model{}
@@ -72,6 +60,18 @@ func NewModel(mesh *Mesh, tex *Tex) *Model {
 	return model
 }
 
+// The model renderer is a system rendering models.
+// It has a 3D position component, to move all models at once.
+type ModelRenderer struct {
+	Pos3D
+
+	Shader *Shader
+	Camera *Camera
+	ortho  bool
+
+	models []Model
+}
+
 // Creates a new model renderer using given shader and camera.
 // If shader and/or camera are nil, the default one will be used.
 // Orth can be set to true, to use orthogonal projection.
@@ -174,20 +174,20 @@ func (s *ModelRenderer) Update(delta float64) {
 
 	var tid uint32
 
-	for i := range s.models {
+	for _, model := range s.models {
-		if !s.models[i].Visible {
+		if !model.Visible {
 			continue
 		}
 
-		s.Shader.SendMat4(Default_shader_3D_model, *s.models[i].CalcModel())
+		s.Shader.SendMat4(Default_shader_3D_model, *model.CalcModel())
-		s.models[i].Vao.Bind()
+		model.Vao.Bind()
 
 		// prevent texture switching when not neccessary
-		if tid != s.models[i].Tex.GetId() {
+		if tid != model.Tex.GetId() {
-			tid = s.models[i].Tex.GetId()
+			tid = model.Tex.GetId()
-			s.models[i].Tex.Bind()
+			model.Tex.Bind()
 		}
 
-		gl.DrawElements(gl.TRIANGLES, s.models[i].Index.Size(), gl.UNSIGNED_INT, nil)
+		gl.DrawElements(gl.TRIANGLES, model.Index.Size(), gl.UNSIGNED_INT, nil)
 	}
 }

pos.go

@@ -8,13 +8,6 @@ type Pos2D struct {
 	M                          Mat3
 }
 
-// Position component for 3D objects
-type Pos3D struct {
-	Pos, Size, Scale, RotPoint, Rot Vec3
-	Visible                         bool
-	M                               Mat4
-}
-
 // Creates a default initialized Pos2D.
 func NewPos2D() *Pos2D {
 	m := Mat3{}
@@ -45,6 +38,13 @@ func (p *Pos2D) PointInRect(point Vec2) bool {
 	return point.X > p.Pos.X && point.X < p.Pos.X+p.Size.X*p.Scale.X && point.Y > p.Pos.Y && point.Y < p.Pos.Y+p.Size.Y*p.Scale.Y
 }
 
+// Position component for 3D objects
+type Pos3D struct {
+	Pos, Size, Scale, RotPoint, Rot Vec3
+	Visible                         bool
+	M                               Mat4
+}
+
 // Creates a default initialized Pos3D.
 func NewPos3D() *Pos3D {
 	m := Mat4{}

scene.go

@@ -4,6 +4,11 @@ import (
 	"log"
 )
 
+var (
+	scenes      []Scene
+	activeScene Scene
+)
+
 // A scene used to switch between game states.
 // The Cleanup() method is called when a scene is removed
 // or the program is stopped. It can be used to cleanup open resources
@@ -19,11 +24,6 @@ type Scene interface {
 	GetName() string
 }
 
-var (
-	scenes      []Scene
-	activeScene Scene
-)
-
 // Adds a scene to game.
 // Returns false if the scene exists already.
 // The first scene added will be set active.

sprite.go

@@ -15,19 +15,6 @@ type Sprite struct {
 	*Tex
 }
 
-// The sprite renderer is a system rendering sprites.
-// It has a 2D position component, to move all sprites at once.
-type SpriteRenderer struct {
-	Pos2D
-
-	Shader *Shader
-	Camera *Camera
-
-	sprites                 []Sprite
-	index, vertex, texCoord *VBO
-	vao                     *VAO
-}
-
 // Creates a new sprite with given texture.
 func NewSprite(tex *Tex) *Sprite {
 	sprite := &Sprite{}
@@ -43,6 +30,19 @@ func NewSprite(tex *Tex) *Sprite {
 	return sprite
 }
 
+// The sprite renderer is a system rendering sprites.
+// It has a 2D position component, to move all sprites at once.
+type SpriteRenderer struct {
+	Pos2D
+
+	Shader *Shader
+	Camera *Camera
+
+	sprites                 []Sprite
+	index, vertex, texCoord *VBO
+	vao                     *VAO
+}
+
 // Creates a new sprite renderer using given shader and camera.
 // If shader and/or camera are nil, the default one will be used.
 func NewSpriteRenderer(shader *Shader, camera *Camera, flip bool) *SpriteRenderer {
@@ -140,17 +140,17 @@ func (s *SpriteRenderer) Update(delta float64) {
 	s.vao.Bind()
 	var tid uint32
 
-	for i := range s.sprites {
+	for _, sprite := range s.sprites {
-		if !s.sprites[i].Visible {
+		if !sprite.Visible {
 			continue
 		}
 
-		s.Shader.SendMat3(Default_shader_2D_model, *s.sprites[i].CalcModel())
+		s.Shader.SendMat3(Default_shader_2D_model, *sprite.CalcModel())
 
 		// prevent texture switching when not neccessary
-		if tid != s.sprites[i].Tex.GetId() {
+		if tid != sprite.Tex.GetId() {
-			tid = s.sprites[i].Tex.GetId()
+			tid = sprite.Tex.GetId()
-			s.sprites[i].Tex.Bind()
+			sprite.Tex.Bind()
 		}
 
 		gl.DrawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, nil)

system.go

@@ -2,6 +2,10 @@ package goga
 
 import ()
 
+var (
+	systems []System
+)
+
 // A system provides logic for actors satisfying required components.
 // They are automatically updated on each frame.
 // When a system is removed from systems, the Cleanup() method will be called.
@@ -17,10 +21,6 @@ type System interface {
 	GetName() string
 }
 
-var (
-	systems []System
-)
-
 // Adds a system to the game.
 // Returns false if the system exists already.
 func AddSystem(system System) bool {

system_util.go

@@ -0,0 +1,51 @@
+package goga
+
+func GetSpriteRenderer() *SpriteRenderer {
+	renderer, ok := GetSystemByName(sprite_renderer_name).(*SpriteRenderer)
+
+	if !ok {
+		panic("Could not obtain sprite renderer")
+	}
+
+	return renderer
+}
+
+func GetModelRenderer() *ModelRenderer {
+	renderer, ok := GetSystemByName(model_renderer_name).(*ModelRenderer)
+
+	if !ok {
+		panic("Could not obtain model renderer")
+	}
+
+	return renderer
+}
+
+func GetCulling2DSystem() *Culling2D {
+	system, ok := GetSystemByName(culling_2d_name).(*Culling2D)
+
+	if !ok {
+		panic("Could not obtain culling system")
+	}
+
+	return system
+}
+
+func GetKeyframeRenderer() *KeyframeRenderer {
+	renderer, ok := GetSystemByName(keyframe_sprite_renderer_name).(*KeyframeRenderer)
+
+	if !ok {
+		panic("Could not obtain keyframe renderer")
+	}
+
+	return renderer
+}
+
+func GetTextRenderer() *TextRenderer {
+	renderer, ok := GetSystemByName(text_renderer_name).(*TextRenderer)
+
+	if !ok {
+		panic("Could not obtain text renderer")
+	}
+
+	return renderer
+}

text.go

@@ -32,36 +32,6 @@ type Font struct {
 	chars            []character
 }
 
-// Renderable text component.
-// Use together with Text and create using NewText().
-type TextComponent struct {
-	Color Vec4
-
-	text                    string
-	bounds                  Vec2
-	index, vertex, texCoord *VBO
-	vao                     *VAO
-}
-
-// Text is an actor representing text rendered as texture mapped font.
-// Each Text has a position and its own buffers.
-type Text struct {
-	*Actor
-	*Pos2D
-	*TextComponent
-}
-
-// The text renderer is a system rendering 2D texture mapped font.
-// It has a 2D position component, to move all texts at once.
-type TextRenderer struct {
-	Pos2D
-
-	Shader *Shader
-	Camera *Camera
-	Font   *Font
-	texts  []Text
-}
-
 // Creates a new font for given texture.
 // The tile size specifies the size of one character tile on texture.
 // Characters must be added afterwards.
@@ -78,47 +48,6 @@ func NewFont(tex *Tex, tileSize float64) *Font {
 	return &font
 }
 
-// Returns a new renderable text object.
-func NewText(font *Font, textStr string) *Text {
-	text := Text{}
-	text.Actor = NewActor()
-	text.Pos2D = NewPos2D()
-	text.TextComponent = &TextComponent{}
-	text.index = NewVBO(gl.ELEMENT_ARRAY_BUFFER)
-	text.vertex = NewVBO(gl.ARRAY_BUFFER)
-	text.texCoord = NewVBO(gl.ARRAY_BUFFER)
-	text.vao = NewVAO()
-	text.SetText(font, textStr)
-	text.Color = Vec4{1, 1, 1, 1}
-	text.Size = Vec2{1, 1}
-	text.Scale = Vec2{1, 1}
-	text.Visible = true
-
-	return &text
-}
-
-// Creates a new text renderer using given shader, camera and font.
-// If shader and/or camera are nil, the default one will be used.
-func NewTextRenderer(shader *Shader, camera *Camera, font *Font) *TextRenderer {
-	if shader == nil {
-		shader = DefaultTextShader
-	}
-
-	if camera == nil {
-		camera = DefaultCamera
-	}
-
-	renderer := &TextRenderer{}
-	renderer.Shader = shader
-	renderer.Camera = camera
-	renderer.Font = font
-	renderer.texts = make([]Text, 0)
-	renderer.Size = Vec2{1, 1}
-	renderer.Scale = Vec2{1, 1}
-
-	return renderer
-}
-
 // Loads characters from JSON file.
 // Format:
 //
@@ -229,6 +158,17 @@ func (f *Font) getChar(char byte) *character {
 	return nil
 }
 
+// Renderable text component.
+// Use together with Text and create using NewText().
+type TextComponent struct {
+	Color Vec4
+
+	text                    string
+	bounds                  Vec2
+	index, vertex, texCoord *VBO
+	vao                     *VAO
+}
+
 // Deletes GL buffers bound to this text component.
 func (t *TextComponent) Drop() {
 	t.index.Drop()
@@ -237,6 +177,33 @@ func (t *TextComponent) Drop() {
 	t.vao.Drop()
 }
 
+// Text is an actor representing text rendered as texture mapped font.
+// Each Text has a position and its own buffers.
+type Text struct {
+	*Actor
+	*Pos2D
+	*TextComponent
+}
+
+// Returns a new renderable text object.
+func NewText(font *Font, textStr string) *Text {
+	text := Text{}
+	text.Actor = NewActor()
+	text.Pos2D = NewPos2D()
+	text.TextComponent = &TextComponent{}
+	text.index = NewVBO(gl.ELEMENT_ARRAY_BUFFER)
+	text.vertex = NewVBO(gl.ARRAY_BUFFER)
+	text.texCoord = NewVBO(gl.ARRAY_BUFFER)
+	text.vao = NewVAO()
+	text.SetText(font, textStr)
+	text.Color = Vec4{1, 1, 1, 1}
+	text.Size = Vec2{1, 1}
+	text.Scale = Vec2{1, 1}
+	text.Visible = true
+
+	return &text
+}
+
 // Sets the given string as text and (re)creates buffers.
 func (t *Text) SetText(font *Font, text string) {
 	t.text = text
@@ -345,6 +312,39 @@ func (t *Text) GetBounds() Vec2 {
 	return Vec2{t.bounds.X * t.Size.X * t.Scale.X, t.bounds.Y * t.Size.Y * t.Scale.Y}
 }
 
+// The text renderer is a system rendering 2D texture mapped font.
+// It has a 2D position component, to move all texts at once.
+type TextRenderer struct {
+	Pos2D
+
+	Shader *Shader
+	Camera *Camera
+	Font   *Font
+	texts  []Text
+}
+
+// Creates a new text renderer using given shader, camera and font.
+// If shader and/or camera are nil, the default one will be used.
+func NewTextRenderer(shader *Shader, camera *Camera, font *Font) *TextRenderer {
+	if shader == nil {
+		shader = DefaultTextShader
+	}
+
+	if camera == nil {
+		camera = DefaultCamera
+	}
+
+	renderer := &TextRenderer{}
+	renderer.Shader = shader
+	renderer.Camera = camera
+	renderer.Font = font
+	renderer.texts = make([]Text, 0)
+	renderer.Size = Vec2{1, 1}
+	renderer.Scale = Vec2{1, 1}
+
+	return renderer
+}
+
 // Prepares given text for rendering.
 func (r *TextRenderer) Prepare(text *Text) {
 	text.vao = NewVAO()
@@ -423,15 +423,15 @@ func (r *TextRenderer) Update(delta float64) {
 	r.Shader.SendUniform1i(Default_shader_text_tex, 0)
 	r.Font.Tex.Bind()
 
-	for i := range r.texts {
+	for _, text := range r.texts {
-		if !r.texts[i].Visible {
+		if !text.Visible {
 			continue
 		}
 
-		r.texts[i].vao.Bind()
+		text.vao.Bind()
-		r.Shader.SendUniform4f(Default_shader_text_color, float32(r.texts[i].Color.X), float32(r.texts[i].Color.Y), float32(r.texts[i].Color.Z), float32(r.texts[i].Color.W))
+		r.Shader.SendUniform4f(Default_shader_text_color, float32(text.Color.X), float32(text.Color.Y), float32(text.Color.Z), float32(text.Color.W))
-		r.Shader.SendMat3(Default_shader_text_model, *r.texts[i].CalcModel())
+		r.Shader.SendMat3(Default_shader_text_model, *text.CalcModel())
 
-		gl.DrawElements(gl.TRIANGLES, r.texts[i].index.Size(), gl.UNSIGNED_INT, nil)
+		gl.DrawElements(gl.TRIANGLES, text.index.Size(), gl.UNSIGNED_INT, nil)
 	}
 }