Added function to easily access loaded textures.

ToDo.md

@@ -4,3 +4,4 @@
 * more logging
 * limit FPS
 * fullscreen
+* simple access to default resources like GetTex()

demo/sprite/sprite.go

@@ -11,24 +11,25 @@ const (
 type Game struct{}
 
 func (g *Game) Setup() {
-	res, err := goga.LoadRes(gopher_path)
+	// load texture
+	_, err := goga.LoadRes(gopher_path)
 
 	if err != nil {
 		panic(err)
 	}
 
-	tex, ok := res.(*goga.Tex)
+	// create sprite
+	tex, err := goga.GetTex("gopher.png")
 
-	if !ok {
-		panic("Resource is not a texture")
+	if err != nil {
+		panic(err)
 	}
 
 	sprite := goga.NewSprite(tex)
 	goga.AddActor(sprite)
 }
 
-func (g *Game) Update(delta float64) {
-}
+func (g *Game) Update(delta float64) {}
 
 func main() {
 	game := Game{}

res_util.go

@@ -0,0 +1,23 @@
+package goga
+
+import (
+	"errors"
+)
+
+// Finds and returns a Tex resource.
+// If not found or when the resource is of wrong type, an error will be returned.
+func GetTex(name string) (*Tex, error) {
+	res := GetResByName(name)
+
+	if res == nil {
+		return nil, errors.New("Resource not found")
+	}
+
+	tex, ok := res.(*Tex)
+
+	if !ok {
+		return nil, errors.New("Resource was not of type *Tex")
+	}
+
+	return tex, nil
+}