More code restructuring and system access functions.

CHANGELOG.md

@@ -0,0 +1,10 @@
+# Changelog
+
+## 0.2_beta
+
+* code restructuring
+* added system access functions (like GetSpriteRenderer())
+
+## 0.1_beta
+
+* beta release

README.md

@@ -1,15 +1,14 @@
 # go-game (package "goga")
 
 Game engine written in Go using OpenGL and GLFW. Mostly for 2D rendering, but also capable of rendering 3D, providing everything to get you started.
-**Under heavy development, do not use yet!**
 
 ## Install
 
 go-game requires OpenGL and GLFW. The following three steps install everything you need:
 
 ```
-go get github.com/go-gl/gl/v4.5-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
 ```
 
@@ -17,18 +16,16 @@ You also need a cgo compiler (typically gcc) and GL/GLFW development libraries a
 
 ## Usage
 
-*WIP*
-
 Examples can be found within the demo folder. For full reference visit: https://godoc.org/github.com/DeKugelschieber/go-game
 
 ## Dependencies
 
 * https://github.com/go-gl/gl
-    - 4.5-core
+    - 3.1-core
 * https://github.com/go-gl/glfw
     - 3.1
 
-To use an older GL version, you need to replace the GL imports in package goga. It should mostly be compatible down to 3.x.
+To use a different GL version, you need to replace the GL imports in package goga.
 
 ## Contribute
 

ToDo.md

@@ -2,6 +2,9 @@
 
 * ~~cleanup resources~~
 * more logging
-* limit FPS
+* ~~limit FPS~~
-* fullscreen
+    - does this really work?
-* simple access to default resources like GetTex()
+* ~~fullscreen~~
+* ~~simple access to default resources like GetTex()~~
+* ~~text rendering + font loading~~
+* more options for GLFW

actor.go

@@ -1,6 +1,8 @@
 package goga
 
-import ()
+var (
+	actorIdGen = ActorId(0)
+)
 
 // An actor ID is a unique integer,
 // which can be used to reference an actor.
@@ -12,10 +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
 		}
 	}
 }

default_shader.go

@@ -0,0 +1,83 @@
+package goga
+
+const (
+	// constants for default 2D shader
+	Default_shader_2D_vertex_attrib   = "vertex"
+	Default_shader_2D_texcoord_attrib = "texCoord"
+	Default_shader_2D_ortho           = "o"
+	Default_shader_2D_model           = "m"
+	Default_shader_2D_tex             = "tex"
+
+	// source for 2D shader
+	default_shader_2d_vertex_src = `#version 130
+		uniform mat3 o, m;
+		in vec2 vertex;
+		in vec2 texCoord;
+		out vec2 tc;
+		void main(){
+			tc = texCoord;
+			gl_Position = vec4(o*m*vec3(vertex, 1.0), 1.0);
+		}`
+	default_shader_2d_fragment_src = `#version 130
+		precision highp float;
+		uniform sampler2D tex;
+		in vec2 tc;
+		out vec4 color;
+		void main(){
+			color = texture(tex, tc);
+		}`
+
+	// constants for default 3D shader
+	Default_shader_3D_vertex_attrib   = "vertex"
+	Default_shader_3D_texcoord_attrib = "texCoord"
+	Default_shader_3D_pv              = "pv"
+	Default_shader_3D_model           = "m"
+	Default_shader_3D_tex             = "tex"
+
+	// source for 3D shader
+	default_shader_3d_vertex_src = `#version 130
+		uniform mat4 pv, m;
+		in vec3 vertex;
+		in vec2 texCoord;
+		out vec2 tc;
+		void main(){
+			tc = texCoord;
+			gl_Position = pv*m*vec4(vertex, 1.0);
+		}`
+	default_shader_3d_fragment_src = `#version 130
+		precision highp float;
+		uniform sampler2D tex;
+		in vec2 tc;
+		out vec4 color;
+		void main(){
+			color = texture(tex, tc);
+		}`
+
+	// constants for default text shader
+	Default_shader_text_vertex_attrib   = "vertex"
+	Default_shader_text_texcoord_attrib = "texCoord"
+	Default_shader_text_ortho           = "o"
+	Default_shader_text_model           = "m"
+	Default_shader_text_tex             = "tex"
+	Default_shader_text_color           = "color"
+
+	// source for text shader
+	default_shader_text_vertex_src = `#version 130
+		uniform mat3 o, m;
+		in vec2 vertex;
+		in vec2 texCoord;
+		out vec2 tc;
+		void main(){
+			tc = texCoord;
+			gl_Position = vec4(o*m*vec3(vertex, 1.0), 1.0);
+		}`
+	default_shader_text_fragment_src = `#version 130
+		precision highp float;
+		uniform sampler2D tex;
+		uniform vec4 color;
+		in vec2 tc;
+		out vec4 c;
+		void main(){
+			c = texture(tex, tc)*color;
+		}`
+)

demo/input/input.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"github.com/DeKugelschieber/go-game"
+	"github.com/go-gl/glfw/v3.2/glfw"
+)
+
+const (
+	gopher_path = "src/github.com/DeKugelschieber/go-game/demo/input/assets/gopher.png"
+)
+
+type Game struct {
+	mouseX, mouseY float64
+	sprite         *goga.Sprite
+}
+
+func (g *Game) Setup() {
+	// load texture
+	_, err := goga.LoadRes(gopher_path)
+
+	if err != nil {
+		panic(err)
+	}
+
+	// create sprite
+	tex, err := goga.GetTex("gopher.png")
+
+	if err != nil {
+		panic(err)
+	}
+
+	sprite := goga.NewSprite(tex)
+	sprite.Size.X = sprite.Size.X / 4
+	sprite.Size.Y = sprite.Size.Y / 4
+	g.sprite = sprite
+	renderer := goga.GetSpriteRenderer()
+	renderer.Add(sprite.Actor, sprite.Pos2D, sprite.Tex)
+
+	culling := goga.GetCulling2DSystem()
+	culling.Add(sprite.Actor, sprite.Pos2D)
+
+	// register input listeners
+	goga.AddKeyboardListener(g)
+	goga.AddMouseListener(g)
+}
+
+func (g *Game) Update(delta float64) {}
+
+func (g *Game) OnKeyEvent(key glfw.Key, code int, action glfw.Action, mod glfw.ModifierKey) {
+	// ESC
+	if key == 256 {
+		goga.Stop()
+	}
+}
+
+func (g *Game) OnMouseButton(button glfw.MouseButton, action glfw.Action, mod glfw.ModifierKey) {
+	if button == 0 {
+		g.sprite.Pos.X = g.mouseX
+		g.sprite.Pos.Y = g.mouseY
+	}
+}
+
+func (g *Game) OnMouseMove(x float64, y float64) {
+	g.mouseX = x
+	g.mouseY = y
+}
+
+func (g *Game) OnMouseScroll(x float64, y float64) {}
+
+func main() {
+	game := Game{}
+	options := goga.RunOptions{ClearColor: goga.Vec4{1, 1, 1, 0},
+		Resizable:           true,
+		SetViewportOnResize: true,
+		ExitOnClose:         true}
+	goga.Run(&game, &options)
+}

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)
 }
 
@@ -55,6 +50,7 @@ func main() {
 	options := goga.RunOptions{ClearColor: goga.Vec4{0, 0, 0, 0},
 		Resizable:           true,
 		SetViewportOnResize: true,
-		ExitOnClose:         true}
+		ExitOnClose:         true,
+		Fullscreen:          true}
 	goga.Run(&game, &options)
 }

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/assets/victor.json

@@ -0,0 +1,113 @@
+[
+    {"char":"a", "x": 0, "y": 0, "offset": 0},
+    {"char":"b", "x": 1, "y": 0, "offset": 0},
+    {"char":"c", "x": 2, "y": 0, "offset": 0},
+    {"char":"d", "x": 3, "y": 0, "offset": 0},
+    {"char":"e", "x": 4, "y": 0, "offset": 0},
+    {"char":"f", "x": 5, "y": 0, "offset": 0},
+    {"char":"g", "x": 6, "y": 0, "offset": 0},
+    {"char":"h", "x": 7, "y": 0, "offset": 0},
+    {"char":"i", "x": 8, "y": 0, "offset": 0},
+    {"char":"j", "x": 9, "y": 0, "offset": 0},
+    {"char":"k", "x": 10, "y": 0, "offset": 0},
+    {"char":"l", "x": 11, "y": 0, "offset": 0},
+    {"char":"m", "x": 12, "y": 0, "offset": 0},
+    {"char":"n", "x": 13, "y": 0, "offset": 0},
+    {"char":"o", "x": 14, "y": 0, "offset": 0},
+    {"char":"p", "x": 15, "y": 0, "offset": 0},
+    {"char":"q", "x": 16, "y": 0, "offset": 0},
+    {"char":"r", "x": 17, "y": 0, "offset": 0},
+    {"char":"s", "x": 18, "y": 0, "offset": 0},
+    {"char":"t", "x": 19, "y": 0, "offset": 0},
+    {"char":"u", "x": 20, "y": 0, "offset": 0},
+    {"char":"v", "x": 21, "y": 0, "offset": 0},
+    {"char":"w", "x": 22, "y": 0, "offset": 0},
+    {"char":"x", "x": 23, "y": 0, "offset": 0},
+    {"char":"y", "x": 24, "y": 0, "offset": 0},
+    {"char":"z", "x": 25, "y": 0, "offset": 0},
+
+    {"char":"A", "x": 0, "y": 0, "offset": 0},
+    {"char":"B", "x": 1, "y": 0, "offset": 0},
+    {"char":"C", "x": 2, "y": 0, "offset": 0},
+    {"char":"D", "x": 3, "y": 0, "offset": 0},
+    {"char":"E", "x": 4, "y": 0, "offset": 0},
+    {"char":"F", "x": 5, "y": 0, "offset": 0},
+    {"char":"G", "x": 6, "y": 0, "offset": 0},
+    {"char":"H", "x": 7, "y": 0, "offset": 0},
+    {"char":"I", "x": 8, "y": 0, "offset": 0},
+    {"char":"J", "x": 9, "y": 0, "offset": 0},
+    {"char":"K", "x": 10, "y": 0, "offset": 0},
+    {"char":"L", "x": 11, "y": 0, "offset": 0},
+    {"char":"M", "x": 12, "y": 0, "offset": 0},
+    {"char":"N", "x": 13, "y": 0, "offset": 0},
+    {"char":"O", "x": 14, "y": 0, "offset": 0},
+    {"char":"P", "x": 15, "y": 0, "offset": 0},
+    {"char":"Q", "x": 16, "y": 0, "offset": 0},
+    {"char":"R", "x": 17, "y": 0, "offset": 0},
+    {"char":"S", "x": 18, "y": 0, "offset": 0},
+    {"char":"T", "x": 19, "y": 0, "offset": 0},
+    {"char":"U", "x": 20, "y": 0, "offset": 0},
+    {"char":"V", "x": 21, "y": 0, "offset": 0},
+    {"char":"W", "x": 22, "y": 0, "offset": 0},
+    {"char":"X", "x": 23, "y": 0, "offset": 0},
+    {"char":"Y", "x": 24, "y": 0, "offset": 0},
+    {"char":"Z", "x": 25, "y": 0, "offset": 0},
+
+    {"char":"0", "x": 26, "y": 0, "offset": 0},
+    {"char":"1", "x": 27, "y": 0, "offset": 0},
+    {"char":"2", "x": 28, "y": 0, "offset": 0},
+    {"char":"3", "x": 29, "y": 0, "offset": 0},
+    {"char":"4", "x": 30, "y": 0, "offset": 0},
+    {"char":"5", "x": 31, "y": 0, "offset": 0},
+    {"char":"6", "x": 32, "y": 0, "offset": 0},
+    {"char":"7", "x": 33, "y": 0, "offset": 0},
+    {"char":"8", "x": 34, "y": 0, "offset": 0},
+    {"char":"9", "x": 35, "y": 0, "offset": 0},
+
+    {"char":"ö", "x": 36, "y": 0, "offset": 0},
+    {"char":"ä", "x": 37, "y": 0, "offset": 0},
+    {"char":"ü", "x": 38, "y": 0, "offset": 0},
+    {"char":"ß", "x": 39, "y": 0, "offset": 0},
+
+    {"char":"Ö", "x": 36, "y": 0, "offset": 0},
+    {"char":"Ä", "x": 37, "y": 0, "offset": 0},
+    {"char":"Ü", "x": 38, "y": 0, "offset": 0},
+
+    {"char":",", "x": 68, "y": 0, "offset": -0.25},
+    {"char":";", "x": 69, "y": 0, "offset": 0},
+    {"char":".", "x": 70, "y": 0, "offset": 0},
+    {"char":":", "x": 71, "y": 0, "offset": 0},
+    {"char":"-", "x": 72, "y": 0, "offset": 0},
+    {"char":"_", "x": 73, "y": 0, "offset": 0},
+
+    {"char":"^", "x": 40, "y": 0, "offset": 0},
+    {"char":"°", "x": 41, "y": 0, "offset": 0},
+    {"char":"!", "x": 42, "y": 0, "offset": 0},
+    {"char":"\"", "x": 43, "y": 0, "offset": 0},
+    {"char":"§", "x": 44, "y": 0, "offset": 0},
+    {"char":"$", "x": 45, "y": 0, "offset": 0},
+    {"char":"%", "x": 46, "y": 0, "offset": 0},
+    {"char":"&", "x": 47, "y": 0, "offset": 0},
+    {"char":"/", "x": 48, "y": 0, "offset": 0},
+    {"char":"(", "x": 49, "y": 0, "offset": 0},
+    {"char":")", "x": 50, "y": 0, "offset": 0},
+    {"char":"=", "x": 51, "y": 0, "offset": 0},
+    {"char":"?", "x": 52, "y": 0, "offset": 0},
+    {"char":"`", "x": 53, "y": 0, "offset": 0},
+    {"char":"²", "x": 54, "y": 0, "offset": 0},
+    {"char":"³", "x": 55, "y": 0, "offset": 0},
+    {"char":"{", "x": 56, "y": 0, "offset": 0},
+    {"char":"[", "x": 57, "y": 0, "offset": 0},
+    {"char":"]", "x": 58, "y": 0, "offset": 0},
+    {"char":"}", "x": 59, "y": 0, "offset": 0},
+    {"char":"\\", "x": 60, "y": 0, "offset": 0},
+    {"char":"+", "x": 61, "y": 0, "offset": 0},
+    {"char":"*", "x": 62, "y": 0, "offset": 0},
+    {"char":"~", "x": 63, "y": 0, "offset": 0},
+    {"char":"#", "x": 64, "y": 0, "offset": 0},
+    {"char":"<", "x": 65, "y": 0, "offset": 0},
+    {"char":">", "x": 66, "y": 0, "offset": 0},
+    {"char":"|", "x": 67, "y": 0, "offset": 0},
+    {"char":"'", "x": 68, "y": 0, "offset": 0},
+    {"char":"'", "x": 69, "y": 0, "offset": 0}
+]

demo/text/text.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"github.com/DeKugelschieber/go-game"
+	"github.com/go-gl/gl/v3.2-core/gl"
+)
+
+const (
+	font_path = "src/github.com/DeKugelschieber/go-game/demo/text/assets/victor.png"
+	font_json = "src/github.com/DeKugelschieber/go-game/demo/text/assets/victor.json"
+)
+
+type Game struct{}
+
+func (g *Game) Setup() {
+	// load texture
+	pngLoader, ok := goga.GetLoaderByExt("png").(*goga.PngLoader)
+
+	if !ok {
+		panic("Could not get PNG loader")
+	}
+
+	pngLoader.KeepData = true
+	pngLoader.Filter = gl.NEAREST
+	_, err := goga.LoadRes(font_path)
+
+	if err != nil {
+		panic(err)
+	}
+
+	pngLoader.KeepData = false
+	pngLoader.Filter = gl.LINEAR
+
+	// create font
+	tex, err := goga.GetTex("victor.png")
+
+	if err != nil {
+		panic(err)
+	}
+
+	font := goga.NewFont(tex, 16)
+
+	if err := font.FromJson(font_json, true); err != nil {
+		panic(err)
+	}
+
+	// setup renderer
+	renderer := goga.GetTextRenderer()
+	renderer.Font = font
+
+	// create and add text
+	text := goga.NewText(font, "Hello, World!_")
+	text.Size = goga.Vec2{16, 16}
+	text.Pos = goga.Vec2{20, 20}
+	renderer.Prepare(text)
+	renderer.Add(text.Actor, text.Pos2D, text.TextComponent)
+}
+
+func (g *Game) Update(delta float64) {}
+
+func main() {
+	game := Game{}
+	options := goga.RunOptions{ClearColor: goga.Vec4{0, 0, 0, 0},
+		Resizable:           true,
+		SetViewportOnResize: true,
+		ExitOnClose:         true}
+	goga.Run(&game, &options)
+}

drop.go

@@ -7,7 +7,7 @@ type Dropable interface {
 }
 
 // Drops given GL objects.
-// Objects must implement the Dropable inteface.
+// Objects must implement the Dropable interface.
 func Drop(objects []Dropable) {
 	for _, obj := range objects {
 		obj.Drop()

fbo.go

@@ -1,7 +1,7 @@
 package goga
 
 import (
-	"github.com/go-gl/gl/v4.5-core/gl"
+	"github.com/go-gl/gl/v3.2-core/gl"
 )
 
 // Frame Buffer Object.

game.go

@@ -1,8 +1,8 @@
 package goga
 
 import (
-	"github.com/go-gl/gl/v4.5-core/gl"
+	"github.com/go-gl/gl/v3.2-core/gl"
-	"github.com/go-gl/glfw/v3.1/glfw"
+	"github.com/go-gl/glfw/v3.2/glfw"
 	"log"
 	"math"
 	"runtime"
@@ -14,112 +14,8 @@ const (
 	default_height        = uint32(400)
 	default_title         = "Game"
 	default_exit_on_close = true
-
-	// constants for default 2D shader
-	Default_shader_2D_vertex_attrib   = "vertex"
-	Default_shader_2D_texcoord_attrib = "texCoord"
-	Default_shader_2D_ortho           = "o"
-	Default_shader_2D_model           = "m"
-	Default_shader_2D_tex             = "tex"
-
-	// source for 2D shader
-	default_shader_2d_vertex_src = `#version 130
-		uniform mat3 o, m;
-		in vec2 vertex;
-		in vec2 texCoord;
-		out vec2 tc;
-		void main(){
-			tc = texCoord;
-			gl_Position = vec4(o*m*vec3(vertex, 1.0), 1.0);
-		}`
-	default_shader_2d_fragment_src = `#version 130
-		precision highp float;
-		uniform sampler2D tex;
-		in vec2 tc;
-		out vec4 color;
-		void main(){
-			color = texture(tex, tc);
-		}`
-
-	// constants for default 3D shader
-	Default_shader_3D_vertex_attrib   = "vertex"
-	Default_shader_3D_texcoord_attrib = "texCoord"
-	Default_shader_3D_pv              = "pv"
-	Default_shader_3D_model           = "m"
-	Default_shader_3D_tex             = "tex"
-
-	// source for 3D shader
-	default_shader_3d_vertex_src = `#version 130
-		uniform mat4 pv, m;
-		in vec3 vertex;
-		in vec2 texCoord;
-		out vec2 tc;
-		void main(){
-			tc = texCoord;
-			gl_Position = pv*m*vec4(vertex, 1.0);
-		}`
-	default_shader_3d_fragment_src = `#version 130
-		precision highp float;
-		uniform sampler2D tex;
-		in vec2 tc;
-		out vec4 color;
-		void main(){
-			color = texture(tex, tc);
-		}`
-
-	// constants for default text shader
-	Default_shader_text_vertex_attrib   = "vertex"
-	Default_shader_text_texcoord_attrib = "texCoord"
-	Default_shader_text_ortho           = "o"
-	Default_shader_text_model           = "m"
-	Default_shader_text_tex             = "tex"
-	Default_shader_text_color           = "color"
-
-	// source for text shader
-	default_shader_text_vertex_src = `#version 130
-		uniform mat3 o, m;
-		in vec2 vertex;
-		in vec2 texCoord;
-		out vec2 tc;
-		void main(){
-			tc = texCoord;
-			gl_Position = vec4(o*m*vec3(vertex, 1.0), 1.0);
-		}`
-	default_shader_text_fragment_src = `#version 130
-		precision highp float;
-		uniform sampler2D tex;
-		uniform vec4 color;
-		in vec2 tc;
-		out vec4 c;
-		void main(){
-			c = texture(tex, tc)*color;
-		}`
 )
 
-// If set in RunOptions, the function will be called on window resize.
-type ResizeCallback func(width, height int)
-
-// Run options allow to set some parameters on startup.
-type RunOptions struct {
-	Title               string
-	Width               uint32
-	Height              uint32
-	ClearColor          Vec4
-	Resizable           bool
-	SetViewportOnResize bool
-	ResizeCallbackFunc  ResizeCallback
-	ExitOnClose         bool
-}
-
-// Main game object.
-// Setup will be called before the main loop and after GL context has been created.
-// Update will be called each frame. This can be used to switch scenes or end game on win state.
-// For game logic, System should be used.
-type Game interface {
-	Setup()
-	Update(float64)
-}
-
 var (
 	running        = true
 	clearColor     = Vec4{}
@@ -134,8 +30,36 @@ var (
 	DefaultTextShader *Shader
 )
 
+// If set in RunOptions, the function will be called on window resize.
+type ResizeCallback func(width, height int)
+
+// Run options allow to set some parameters on startup.
+type RunOptions struct {
+	Title               string
+	Width               uint32
+	Height              uint32
+	ClearColor          Vec4
+	Resizable           bool
+	SetViewportOnResize bool
+	ResizeCallbackFunc  ResizeCallback
+	ExitOnClose         bool
+	RefreshRate         int
+	Fullscreen          bool
+	MonitorId           uint // index
+}
+
+// Main game object.
+// Setup will be called before the main loop and after GL context has been created.
+// Update will be called each frame. This can be used to switch scenes or end game on win state.
+// For game logic, System should be used.
+type Game interface {
+	Setup()
+	Update(float64)
+}
+
 func init() {
-	// GL functions must be called from main thread.
+	// GL functions must be called from main thread,
+	// so we disable multithreading by the runtime here.
 	log.Print("Locking OS thread")
 	runtime.LockOSThread()
 }
@@ -168,32 +92,52 @@ func Run(game Game, options *RunOptions) {
 	title := default_title
 	exitOnClose := default_exit_on_close
 
-	if options != nil && options.Width > 0 {
-		width = options.Width
-	}
-
-	if options != nil && options.Height > 0 {
-		height = options.Height
-	}
-
-	if options != nil && len(options.Title) > 0 {
-		title = options.Title
-	}
-
 	if options != nil {
+		if options.Width > 0 {
+			width = options.Width
+		}
+
+		if options.Height > 0 {
+			height = options.Height
+		}
+
+		if len(options.Title) > 0 {
+			title = options.Title
+		}
+
 		exitOnClose = options.ExitOnClose
+
+		if !options.Resizable {
+			glfw.WindowHint(glfw.Resizable, glfw.False)
+		}
 	}
 
-	if options != nil && !options.Resizable {
+	var monitor *glfw.Monitor
-		glfw.WindowHint(glfw.Resizable, glfw.False)
+
+	if options != nil && options.Fullscreen {
+		monitors := glfw.GetMonitors()
+
+		if int(options.MonitorId) < len(monitors) {
+			monitor = monitors[options.MonitorId]
+		}
 	}
 
-	wnd, err := glfw.CreateWindow(int(width), int(height), title, nil, nil)
+	if monitor != nil {
+		videoMode := monitor.GetVideoMode()
+		width = uint32(videoMode.Width)
+		height = uint32(videoMode.Height)
+	}
+
+	wnd, err := glfw.CreateWindow(int(width), int(height), title, monitor, nil)
 
 	if err != nil {
 		panic("Error creating GLFW window: " + err.Error())
 	}
 
+	if options != nil && options.RefreshRate != 0 {
+		glfw.WindowHint(glfw.RefreshRate, options.RefreshRate)
+	}
+
 	// window event handlers
 	wnd.SetSizeCallback(func(w *glfw.Window, width, height int) {
 		if options == nil {
@@ -211,6 +155,8 @@ func Run(game Game, options *RunOptions) {
 		}
 	})
 
+	initInput(wnd)
+
 	// make GL context current
 	wnd.MakeContextCurrent()
 
@@ -235,8 +181,8 @@ func Run(game Game, options *RunOptions) {
 	delta := time.Duration(0)
 	var deltaSec float64
 
-	for running {
+	for {
-		if exitOnClose && wnd.ShouldClose() {
+		if !running || exitOnClose && wnd.ShouldClose() {
 			cleanup()
 			return
 		}
@@ -310,6 +256,7 @@ func initGoga(width, height int) {
 	AddSystem(NewModelRenderer(nil, nil, false))
 	AddSystem(NewCulling2D(0, 0, width, height))
 	AddSystem(NewKeyframeRenderer(nil, nil))
+	AddSystem(NewTextRenderer(nil, nil, nil)) // font must be set outside!
 }
 
 func cleanup() {

gl_util.go

@@ -1,7 +1,7 @@
 package goga
 
 import (
-	"github.com/go-gl/gl/v4.5-core/gl"
+	"github.com/go-gl/gl/v3.2-core/gl"
 	"log"
 )
 

input.go

@@ -0,0 +1,98 @@
+package goga
+
+import (
+	"github.com/go-gl/glfw/v3.2/glfw"
+)
+
+var (
+	keyboardListener []KeyboardListener
+	mouseListener    []MouseListener
+)
+
+// Interface for keyboard input events.
+// Implement and register to receive keyboard input.
+type KeyboardListener interface {
+	OnKeyEvent(glfw.Key, int, glfw.Action, glfw.ModifierKey)
+}
+
+// Interface for mouse input events.
+// Implement and register to receive mouse input.
+type MouseListener interface {
+	OnMouseButton(glfw.MouseButton, glfw.Action, glfw.ModifierKey)
+	OnMouseMove(float64, float64)
+	OnMouseScroll(float64, float64)
+}
+
+func initInput(wnd *glfw.Window) {
+	wnd.SetKeyCallback(keyboardCallback)
+	wnd.SetMouseButtonCallback(mouseButtonCallback)
+	wnd.SetCursorPosCallback(mouseMoveCallback)
+	wnd.SetScrollCallback(mouseScrollCallback)
+
+	keyboardListener = make([]KeyboardListener, 0)
+	mouseListener = make([]MouseListener, 0)
+}
+
+func keyboardCallback(wnd *glfw.Window, key glfw.Key, code int, action glfw.Action, mod glfw.ModifierKey) {
+	for _, listener := range keyboardListener {
+		listener.OnKeyEvent(key, code, action, mod)
+	}
+}
+
+func mouseButtonCallback(wnd *glfw.Window, button glfw.MouseButton, action glfw.Action, mod glfw.ModifierKey) {
+	for _, listener := range mouseListener {
+		listener.OnMouseButton(button, action, mod)
+	}
+}
+
+func mouseMoveCallback(wnd *glfw.Window, x float64, y float64) {
+	for _, listener := range mouseListener {
+		listener.OnMouseMove(x, float64(viewportHeight)-y)
+	}
+}
+
+func mouseScrollCallback(wnd *glfw.Window, x float64, y float64) {
+	for _, listener := range mouseListener {
+		listener.OnMouseScroll(x, y)
+	}
+}
+
+// Adds a new keyboard listener.
+func AddKeyboardListener(listener KeyboardListener) {
+	keyboardListener = append(keyboardListener, listener)
+}
+
+// Removes given keyboard listener if found.
+func RemoveKeyboardListener(listener KeyboardListener) {
+	for i, l := range keyboardListener {
+		if l == listener {
+			keyboardListener = append(keyboardListener[:i], keyboardListener[i+1:]...)
+			return
+		}
+	}
+}
+
+// Removes all registered keyboard listeners.
+func RemoveAllKeyboardListener() {
+	keyboardListener = make([]KeyboardListener, 0)
+}
+
+// Adds a new mouse listener.
+func AddMouseListener(listener MouseListener) {
+	mouseListener = append(mouseListener, listener)
+}
+
+// Removes given mouse listener if found.
+func RemoveMouseListener(listener MouseListener) {
+	for i, l := range mouseListener {
+		if l == listener {
+			mouseListener = append(mouseListener[:i], mouseListener[i+1:]...)
+			return
+		}
+	}
+}
+
+// Removes all registered mouse listeners.
+func RemoveAllMouseListener() {
+	mouseListener = make([]MouseListener, 0)
+}

keyframe.go

@@ -1,7 +1,7 @@
 package goga
 
 import (
-	"github.com/go-gl/gl/v4.5-core/gl"
+	"github.com/go-gl/gl/v3.2-core/gl"
 )
 
 const (
@@ -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

@@ -3,7 +3,7 @@ package goga
 import (
 	"bufio"
 	"errors"
-	"github.com/go-gl/gl/v4.5-core/gl"
+	"github.com/go-gl/gl/v3.2-core/gl"
 	"image"
 	"image/draw"
 	"image/png"
@@ -75,6 +75,13 @@ type Ply struct {
 	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 {
@@ -124,13 +131,6 @@ func (p *Ply) SetExt(ext string) {
 	p.ext = ext
 }
 
-// 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 *PlyLoader) Load(file string) (Res, error) {
 	handle, err := os.Open(file)
 	defer handle.Close()

model.go

@@ -1,7 +1,7 @@
 package goga
 
 import (
-	"github.com/go-gl/gl/v4.5-core/gl"
+	"github.com/go-gl/gl/v3.2-core/gl"
 )
 
 const (
@@ -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)
 	}
 }

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.

shader.go

@@ -2,7 +2,7 @@ package goga
 
 import (
 	"errors"
-	"github.com/go-gl/gl/v4.5-core/gl"
+	"github.com/go-gl/gl/v3.2-core/gl"
 	"log"
 	"strings"
 )

sprite.go

@@ -1,7 +1,7 @@
 package goga
 
 import (
-	"github.com/go-gl/gl/v4.5-core/gl"
+	"github.com/go-gl/gl/v3.2-core/gl"
 )
 
 const (
@@ -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
+}

tex.go

@@ -1,7 +1,7 @@
 package goga
 
 import (
-	"github.com/go-gl/gl/v4.5-core/gl"
+	"github.com/go-gl/gl/v3.2-core/gl"
 	"image"
 )
 

text.go

@@ -1,69 +1,51 @@
 package goga
 
-/*
 import (
-	"core"
-	"dp"
 	"encoding/json"
-	"geo"
+	"github.com/go-gl/gl/v3.2-core/gl"
-	"github.com/go-gl/gl/v4.5-core/gl"
 	"io/ioutil"
-	"util"
 )
 
 const (
-	char_padding = 2
+	char_padding       = 2
+	text_renderer_name = "textRenderer"
 )
 
-// Returns a new renderable text object.
+type character struct {
-func NewText(font *Font, text string) *Text {
-	t := &Text{id: core.NextId()}
-	t.text = text
-	t.index = dp.NewVBO(gl.ELEMENT_ARRAY_BUFFER)
-	t.vertex = dp.NewVBO(gl.ARRAY_BUFFER)
-	t.texCoord = dp.NewVBO(gl.ARRAY_BUFFER)
-	t.vao = dp.NewVAO()
-	t.SetText(font, text)
-	t.Size = geo.Vec2{1, 1}
-	t.Scale = geo.Vec2{1, 1}
-	t.Visible = true
-
-	return t
-}
-
-type Character struct {
 	char           byte
-	min, max, size geo.Vec2
+	min, max, size Vec2
 	offset         float64
 }
 
-type Font struct {
-	Tex              *dp.Tex
-	tileSize         float64
-	CharPadding      geo.Vec2
-	Space, Tab, Line float64
-	chars            []Character
-}
-
 type jsonChar struct {
 	Char         string
 	X, Y, Offset float64
 }
 
-// Creates a new font from texture. Characters must be added afterwards.
+// Font represents a texture mapped font.
-// The characters must be placed within a grid,
+// It can be loaded from JSON together with a texture.
-// the second parameter describes the width and height of one tile in pixel.
+type Font struct {
-func NewFont(tex *dp.Tex, tileSize int) *Font {
+	Tex              *Tex
-	font := &Font{}
+	tileSize         float64
+	CharPadding      Vec2
+	Space, Tab, Line float64
+	chars            []character
+}
+
+// Creates a new font for given texture.
+// The tile size specifies the size of one character tile on texture.
+// Characters must be added afterwards.
+func NewFont(tex *Tex, tileSize float64) *Font {
+	font := Font{}
 	font.Tex = tex
-	font.tileSize = float64(tileSize)
+	font.tileSize = tileSize
-	font.CharPadding = geo.Vec2{0.05, 0.05}
+	font.CharPadding = Vec2{0.05, 0.05}
 	font.Space = 0.3
 	font.Tab = 1.2
 	font.Line = 1
-	font.chars = make([]Character, 0)
+	font.chars = make([]character, 0)
 
-	return font
+	return &font
 }
 
 // Loads characters from JSON file.
@@ -82,7 +64,7 @@ func NewFont(tex *dp.Tex, tileSize int) *Font {
 // Where x and y start in the upper left corner of the texture, both of type int.
 // Offset is optional and can be used to move a character up or down (relative to others).
 // If cut is set to true, the characters will be true typed.
-func (f *Font) LoadFromJson(path string, cut bool) error {
+func (f *Font) FromJson(path string, cut bool) error {
 	// load file content
 	content, err := ioutil.ReadFile(path)
 
@@ -108,21 +90,22 @@ func (f *Font) extractChars(chars []jsonChar, cut bool) {
 			continue
 		}
 
-		var min, max, size geo.Vec2
+		var min, max, size Vec2
 
 		if !cut {
-			min = geo.Vec2{char.X * f.tileSize, char.Y * f.tileSize}
+			min = Vec2{char.X * f.tileSize, char.Y * f.tileSize}
-			max = geo.Vec2{min.X + f.tileSize, min.Y + f.tileSize}
+			max = Vec2{min.X + f.tileSize, min.Y + f.tileSize}
-			size = geo.Vec2{1, 1}
+			size = Vec2{1, 1}
 		} else {
 			min, max, size = f.cutChar(int(char.X), int(char.Y))
 		}
 
-		f.chars = append(f.chars, Character{char.Char[0], min, max, size, char.Offset})
+		f.chars = append(f.chars, character{char.Char[0], min, max, size, char.Offset})
 	}
 }
 
-func (f *Font) cutChar(x, y int) (geo.Vec2, geo.Vec2, geo.Vec2) {
+func (f *Font) cutChar(x, y int) (Vec2, Vec2, Vec2) {
+	// find min/max corners of character on texture
 	minX := int(f.Tex.GetSize().X)
 	minY := int(f.Tex.GetSize().Y)
 	maxX := 0
@@ -151,22 +134,21 @@ func (f *Font) cutChar(x, y int) (geo.Vec2, geo.Vec2, geo.Vec2) {
 		}
 	}
 
+	// add padding
 	minX -= char_padding
 	maxX += char_padding
 	minY -= char_padding
 	maxY += char_padding
 
 	texSize := f.Tex.GetSize()
-	min := geo.Vec2{float64(minX) / texSize.X, float64(maxY) / texSize.Y}
+	min := Vec2{float64(minX) / texSize.X, float64(maxY) / texSize.Y}
-	max := geo.Vec2{float64(maxX) / texSize.X, float64(minY) / texSize.Y}
+	max := Vec2{float64(maxX) / texSize.X, float64(minY) / texSize.Y}
-
+	size := Vec2{float64(maxX-minX) / f.tileSize, float64(maxY-minY) / f.tileSize}
-	// size
-	size := geo.Vec2{float64(maxX-minX) / f.tileSize, float64(maxY-minY) / f.tileSize}
 
 	return min, max, size
 }
 
-func (f *Font) getChar(char byte) *Character {
+func (f *Font) getChar(char byte) *character {
 	for _, character := range f.chars {
 		if character.char == char {
 			return &character
@@ -176,30 +158,55 @@ func (f *Font) getChar(char byte) *Character {
 	return nil
 }
 
-type Text struct {
+// Renderable text component.
-	*Actor
+// Use together with Text and create using NewText().
-	*Pos2D
+type TextComponent struct {
+	Color Vec4
 
-	id     int
+	text                    string
-	text   string
+	bounds                  Vec2
-	bounds geo.Vec2
+	index, vertex, texCoord *VBO
-
+	vao                     *VAO
-	index, vertex, texCoord *dp.VBO
-	vao                     *dp.VAO
 }
 
-// Deletes GL buffers bound to this text.
+// Deletes GL buffers bound to this text component.
-func (t *Text) Drop() {
+func (t *TextComponent) Drop() {
 	t.index.Drop()
 	t.vertex.Drop()
 	t.texCoord.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
-
 	indices := make([]uint32, len(text)*6)
 	vertices := make([]float32, len(text)*8)
 	texCoords := make([]float32, len(text)*8)
@@ -221,7 +228,7 @@ func (t *Text) SetText(font *Font, text string) {
 
 	// create vertices/texCoords
 	index = 0
-	offset := geo.Vec2{}
+	offset := Vec2{}
 	var width, height float64
 
 	for i := 0; i < len(text)*8 && int(index) < len(text); i += 8 {
@@ -285,18 +292,14 @@ func (t *Text) SetText(font *Font, text string) {
 		}
 	}
 
-	t.bounds = geo.Vec2{width, height}
+	t.bounds = Vec2{width, height}
 
 	// fill GL buffer
 	t.index.Fill(gl.Ptr(indices[:chars*6]), 4, chars*6, gl.STATIC_DRAW)
 	t.vertex.Fill(gl.Ptr(vertices[:chars*8]), 4, chars*8, gl.STATIC_DRAW)
 	t.texCoord.Fill(gl.Ptr(texCoords[:chars*8]), 4, chars*8, gl.STATIC_DRAW)
 
-	util.CheckGLError()
+	CheckGLError()
-}
-
-func (t *Text) GetId() int {
-	return t.id
 }
 
 // Returns the text as string.
@@ -305,98 +308,130 @@ func (t *Text) GetText() string {
 }
 
 // Returns bounds of text, which is the size of characters.
-func (t *Text) GetBounds() geo.Vec2 {
+func (t *Text) GetBounds() Vec2 {
-	return geo.Vec2{t.bounds.X * t.Size.X * t.Scale.X, t.bounds.Y * t.Size.Y * t.Scale.Y}
+	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 *dp.Shader
+	Shader *Shader
 	Camera *Camera
 	Font   *Font
-	Color  geo.Vec4
+	texts  []Text
-	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 *dp.Shader, camera *Camera, font *Font) *TextRenderer {
+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.Color = geo.Vec4{1, 1, 1, 1}
+	renderer.texts = make([]Text, 0)
-	renderer.texts = make([]*Text, 0)
+	renderer.Size = Vec2{1, 1}
-	renderer.Size = geo.Vec2{1, 1}
+	renderer.Scale = Vec2{1, 1}
-	renderer.Scale = geo.Vec2{1, 1}
 
 	return renderer
 }
 
-// Prepares a text for rendering.
+// Prepares given text for rendering.
 func (r *TextRenderer) Prepare(text *Text) {
-	text.vao = dp.NewVAO()
+	text.vao = NewVAO()
 	text.vao.Bind()
 	r.Shader.EnableVertexAttribArrays()
 	text.index.Bind()
 	text.vertex.Bind()
-	text.vertex.AttribPointer(r.Shader.GetAttribLocation(TEXTRENDERER_VERTEX_ATTRIB), 2, gl.FLOAT, false, 0)
+	text.vertex.AttribPointer(r.Shader.GetAttribLocation(Default_shader_text_vertex_attrib), 2, gl.FLOAT, false, 0)
 	text.texCoord.Bind()
-	text.texCoord.AttribPointer(r.Shader.GetAttribLocation(TEXTRENDERER_TEXCOORD_ATTRIB), 2, gl.FLOAT, false, 0)
+	text.texCoord.AttribPointer(r.Shader.GetAttribLocation(Default_shader_text_texcoord_attrib), 2, gl.FLOAT, false, 0)
 	text.vao.Unbind()
 }
 
-// Adds text to the renderer.
+// Frees recources created by text component.
-func (r *TextRenderer) Add(text *Text) {
+// This is called automatically when system gets removed.
-	r.texts = append(r.texts, text)
+func (r *TextRenderer) Cleanup() {
+	for _, text := range r.texts {
+		text.Drop()
+	}
 }
 
-// Returns text by ID.
+// Adds text to the renderer.
-func (r *TextRenderer) Get(id int) *Text {
+func (r *TextRenderer) Add(actor *Actor, pos *Pos2D, text *TextComponent) bool {
+	id := actor.GetId()
+
 	for _, text := range r.texts {
-		if text.GetId() == id {
+		if id == text.Actor.GetId() {
-			return text
+			return false
 		}
 	}
 
-	return nil
+	r.texts = append(r.texts, Text{actor, pos, text})
+
+	return true
+}
+
+// Removes text from renderer.
+func (r *TextRenderer) Remove(actor *Actor) bool {
+	return r.RemoveById(actor.GetId())
 }
 
 // Removes text from renderer by ID.
-func (r *TextRenderer) Remove(id int) *Text {
+func (r *TextRenderer) RemoveById(id ActorId) bool {
 	for i, text := range r.texts {
-		if text.GetId() == id {
+		if text.Actor.GetId() == id {
 			r.texts = append(r.texts[:i], r.texts[i+1:]...)
-			return text
+			return true
 		}
 	}
 
-	return nil
+	return false
 }
 
-// Removes all sprites.
+// Removes all texts.
-func (r *TextRenderer) Clear() {
+func (r *TextRenderer) RemoveAll() {
-	r.texts = make([]*Text, 0)
+	r.texts = make([]Text, 0)
 }
 
-// Renders sprites.
+// Returns number of texts.
-func (r *TextRenderer) Render() {
+func (r *TextRenderer) Len() int {
+	return len(r.texts)
+}
+
+func (r *TextRenderer) GetName() string {
+	return text_renderer_name
+}
+
+// Renders texts.
+func (r *TextRenderer) Update(delta float64) {
+	if r.Font == nil {
+		return
+	}
+
 	r.Shader.Bind()
-	r.Shader.SendMat3(TEXTRENDERER_ORTHO, *geo.MultMat3(r.Camera.CalcOrtho(), r.CalcModel()))
+	r.Shader.SendMat3(Default_shader_text_ortho, *MultMat3(r.Camera.CalcOrtho(), r.CalcModel()))
-	r.Shader.SendUniform1i(TEXTRENDERER_TEX, 0)
+	r.Shader.SendUniform1i(Default_shader_text_tex, 0)
-	r.Shader.SendUniform4f(TEXTRENDERER_COLOR, float32(r.Color.X), float32(r.Color.Y), float32(r.Color.Z), float32(r.Color.W))
 	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.SendMat3(TEXTRENDERER_MODEL, *r.texts[i].CalcModel())
+		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, *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)
 	}
 }
-*/

vao.go

@@ -1,7 +1,7 @@
 package goga
 
 import (
-	"github.com/go-gl/gl/v4.5-core/gl"
+	"github.com/go-gl/gl/v3.2-core/gl"
 )
 
 // Vertex Array Object.

vbo.go

@@ -1,7 +1,7 @@
 package goga
 
 import (
-	"github.com/go-gl/gl/v4.5-core/gl"
+	"github.com/go-gl/gl/v3.2-core/gl"
 	"unsafe"
 )