Removed unnecessary true.

CHANGELOG.md

@@ -0,0 +1,5 @@
+# Changelog
+
+## 0.1_beta
+
+* beta release

README.md

@@ -1,14 +1,13 @@
 # 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/v3.1-core/gl
 go get github.com/go-gl/glfw/v3.1/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
-* fullscreen
-* simple access to default resources like GetTex()
+* ~~limit FPS~~
+    - does this really work?
+* ~~fullscreen~~
+* ~~simple access to default resources like GetTex()~~
+* ~~text rendering + font loading~~
+* more options for GLFW

actor.go

@@ -1,7 +1,5 @@
 package goga
 
-import ()
-
 // An actor ID is a unique integer,
 // which can be used to reference an actor.
 type ActorId uint64

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 +1,87 @@
+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, ok := goga.GetSystemByName("spriteRenderer").(*goga.SpriteRenderer)
+
+	if !ok {
+		panic("Could not find renderer")
+	}
+
+	renderer.Add(sprite.Actor, sprite.Pos2D, sprite.Tex)
+
+	culling, ok := goga.GetSystemByName("culling2d").(*goga.Culling2D)
+
+	if !ok {
+		panic("Could not find culling")
+	}
+
+	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

@@ -55,6 +55,7 @@ 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/text/assets/dejavu.json

@@ -1,28 +0,0 @@
-[
-	{
-		"char": "A",
-		"x": 0,
-		"y": 0
-	},
-	{
-		"char": "b",
-		"x": 1,
-		"y": 0
-	},
-	{
-		"char": "e",
-		"x": 2,
-		"y": 0
-	},
-	{
-		"char": "r",
-		"x": 0,
-		"y": 1
-	},
-	{
-		"char": "'",
-		"x": 3,
-		"y": 0,
-		"offset": 0.5
-	}
-]

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

@@ -2,52 +2,70 @@ package main
 
 import (
 	"github.com/DeKugelschieber/go-game"
+	"github.com/go-gl/gl/v3.2-core/gl"
 )
 
 const (
-	gopher_path = "src/github.com/DeKugelschieber/go-game/demo/sprite/assets/gopher.png"
+	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
-	_, err := goga.LoadRes(gopher_path)
+	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)
 	}
 
-	// create sprite
-	tex, err := goga.GetTex("gopher.png")
+	pngLoader.KeepData = false
+	pngLoader.Filter = gl.LINEAR
+
+	// create font
+	tex, err := goga.GetTex("victor.png")
 
 	if err != nil {
 		panic(err)
 	}
 
-	sprite := goga.NewSprite(tex)
-	renderer, ok := goga.GetSystemByName("spriteRenderer").(*goga.SpriteRenderer)
+	font := goga.NewFont(tex, 16)
+
+	if err := font.FromJson(font_json, true); err != nil {
+		panic(err)
+	}
+
+	// setup renderer
+	renderer, ok := goga.GetSystemByName("textRenderer").(*goga.TextRenderer)
 
 	if !ok {
 		panic("Could not find renderer")
 	}
 
-	renderer.Add(sprite.Actor, sprite.Pos2D, sprite.Tex)
+	renderer.Font = font
 
-	culling, ok := goga.GetSystemByName("culling2d").(*goga.Culling2D)
-
-	if !ok {
-		panic("Could not find culling")
-	}
-
-	culling.Add(sprite.Actor, sprite.Pos2D)
+	// 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{1, 1, 1, 0},
+	options := goga.RunOptions{ClearColor: goga.Vec4{0, 0, 0, 0},
 		Resizable:           true,
 		SetViewportOnResize: true,
 		ExitOnClose:         true}

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/glfw/v3.1/glfw"
+	"github.com/go-gl/gl/v3.2-core/gl"
+	"github.com/go-gl/glfw/v3.2/glfw"
 	"log"
 	"math"
 	"runtime"
@@ -14,86 +14,6 @@ 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.
@@ -109,6 +29,9 @@ type RunOptions struct {
 	SetViewportOnResize bool
 	ResizeCallbackFunc  ResizeCallback
 	ExitOnClose         bool
+	RefreshRate         int
+	Fullscreen          bool
+	MonitorId           uint // index
 }
 
 // Main game object.
@@ -135,7 +58,8 @@ var (
 )
 
 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 {
+	if options != nil {
+		if options.Width > 0 {
 			width = options.Width
 		}
 
-	if options != nil && options.Height > 0 {
+		if options.Height > 0 {
 			height = options.Height
 		}
 
-	if options != nil && len(options.Title) > 0 {
+		if len(options.Title) > 0 {
 			title = options.Title
 		}
 
-	if options != nil {
 		exitOnClose = options.ExitOnClose
-	}
 
-	if options != nil && !options.Resizable {
+		if !options.Resizable {
 			glfw.WindowHint(glfw.Resizable, glfw.False)
 		}
+	}
 
-	wnd, err := glfw.CreateWindow(int(width), int(height), title, nil, nil)
+	var monitor *glfw.Monitor
+
+	if options != nil && options.Fullscreen {
+		monitors := glfw.GetMonitors()
+
+		if int(options.MonitorId) < len(monitors) {
+			monitor = monitors[options.MonitorId]
+		}
+	}
+
+	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 {
-		if exitOnClose && wnd.ShouldClose() {
+	for {
+		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 (
@@ -14,6 +14,44 @@ 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}
@@ -36,11 +74,6 @@ 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{}
@@ -55,31 +88,11 @@ 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{}
@@ -101,19 +114,6 @@ 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 {

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"
@@ -21,6 +21,27 @@ 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)
@@ -61,20 +82,6 @@ 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
-}
-
 // 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 (
@@ -14,6 +14,26 @@ 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 {
@@ -36,14 +56,6 @@ 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{}
@@ -60,18 +72,6 @@ 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.

pos.go

@@ -8,6 +8,13 @@ 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{}
@@ -38,13 +45,6 @@ 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{}

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 (
@@ -15,6 +15,19 @@ 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{}
@@ -30,19 +43,6 @@ 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 {

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 +1,122 @@
 package goga
 
-/*
 import (
-	"core"
-	"dp"
 	"encoding/json"
-	"geo"
-	"github.com/go-gl/gl/v4.5-core/gl"
+	"github.com/go-gl/gl/v3.2-core/gl"
 	"io/ioutil"
-	"util"
 )
 
 const (
 	char_padding       = 2
+	text_renderer_name = "textRenderer"
 )
 
-// Returns a new renderable text object.
-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 {
+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.
-// The characters must be placed within a grid,
-// the second parameter describes the width and height of one tile in pixel.
-func NewFont(tex *dp.Tex, tileSize int) *Font {
-	font := &Font{}
+// Font represents a texture mapped font.
+// It can be loaded from JSON together with a texture.
+type Font struct {
+	Tex              *Tex
+	tileSize         float64
+	CharPadding      Vec2
+	Space, Tab, Line float64
+	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.
+func NewFont(tex *Tex, tileSize float64) *Font {
+	font := Font{}
 	font.Tex = tex
-	font.tileSize = float64(tileSize)
-	font.CharPadding = geo.Vec2{0.05, 0.05}
+	font.tileSize = tileSize
+	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
+}
+
+// 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.
@@ -82,7 +135,7 @@ 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 +161,22 @@ 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}
-			max = geo.Vec2{min.X + f.tileSize, min.Y + f.tileSize}
-			size = geo.Vec2{1, 1}
+			min = Vec2{char.X * f.tileSize, char.Y * f.tileSize}
+			max = Vec2{min.X + f.tileSize, min.Y + f.tileSize}
+			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 +205,21 @@ 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}
-	max := geo.Vec2{float64(maxX) / texSize.X, float64(minY) / texSize.Y}
-
-	// size
-	size := geo.Vec2{float64(maxX-minX) / f.tileSize, float64(maxY-minY) / f.tileSize}
+	min := Vec2{float64(minX) / texSize.X, float64(maxY) / texSize.Y}
+	max := Vec2{float64(maxX) / texSize.X, float64(minY) / texSize.Y}
+	size := 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
@@ -176,20 +229,8 @@ func (f *Font) getChar(char byte) *Character {
 	return nil
 }
 
-type Text struct {
-	*Actor
-	*Pos2D
-
-	id     int
-	text   string
-	bounds geo.Vec2
-
-	index, vertex, texCoord *dp.VBO
-	vao                     *dp.VAO
-}
-
-// Deletes GL buffers bound to this text.
-func (t *Text) Drop() {
+// Deletes GL buffers bound to this text component.
+func (t *TextComponent) Drop() {
 	t.index.Drop()
 	t.vertex.Drop()
 	t.texCoord.Drop()
@@ -199,7 +240,6 @@ func (t *Text) Drop() {
 // 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 +261,7 @@ 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 +325,14 @@ 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()
-}
-
-func (t *Text) GetId() int {
-	return t.id
+	CheckGLError()
 }
 
 // Returns the text as string.
@@ -305,87 +341,86 @@ func (t *Text) GetText() string {
 }
 
 // Returns bounds of text, which is the size of characters.
-func (t *Text) GetBounds() geo.Vec2 {
-	return geo.Vec2{t.bounds.X * t.Size.X * t.Scale.X, t.bounds.Y * t.Size.Y * t.Scale.Y}
+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}
 }
 
-type TextRenderer struct {
-	Pos2D
-
-	Shader *dp.Shader
-	Camera *Camera
-	Font   *Font
-	Color  geo.Vec4
-	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 {
-	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.Size = geo.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.
-func (r *TextRenderer) Add(text *Text) {
-	r.texts = append(r.texts, text)
+// Frees recources created by text component.
+// This is called automatically when system gets removed.
+func (r *TextRenderer) Cleanup() {
+	for _, text := range r.texts {
+		text.Drop()
+	}
 }
 
-// Returns text by ID.
-func (r *TextRenderer) Get(id int) *Text {
+// Adds text to the renderer.
+func (r *TextRenderer) Add(actor *Actor, pos *Pos2D, text *TextComponent) bool {
+	id := actor.GetId()
+
 	for _, text := range r.texts {
-		if text.GetId() == id {
-			return text
+		if id == text.Actor.GetId() {
+			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.
-func (r *TextRenderer) Clear() {
-	r.texts = make([]*Text, 0)
+// Removes all texts.
+func (r *TextRenderer) RemoveAll() {
+	r.texts = make([]Text, 0)
 }
 
-// Renders sprites.
-func (r *TextRenderer) Render() {
+// Returns number of texts.
+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.SendUniform1i(TEXTRENDERER_TEX, 0)
-	r.Shader.SendUniform4f(TEXTRENDERER_COLOR, float32(r.Color.X), float32(r.Color.Y), float32(r.Color.Z), float32(r.Color.W))
+	r.Shader.SendMat3(Default_shader_text_ortho, *MultMat3(r.Camera.CalcOrtho(), r.CalcModel()))
+	r.Shader.SendUniform1i(Default_shader_text_tex, 0)
 	r.Font.Tex.Bind()
 
 	for i := range r.texts {
@@ -394,9 +429,9 @@ func (r *TextRenderer) Render() {
 		}
 
 		r.texts[i].vao.Bind()
-		r.Shader.SendMat3(TEXTRENDERER_MODEL, *r.texts[i].CalcModel())
+		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.SendMat3(Default_shader_text_model, *r.texts[i].CalcModel())
 
 		gl.DrawElements(gl.TRIANGLES, r.texts[i].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"
 )