factor out renderLoop

gfx/gfx.go

@@ -28,12 +28,12 @@ type context struct {
 	w     *pixelgl.Window
 }
 
-type spriteBank struct {
+type SpriteBank struct {
 	racer    pixel.Picture
 	obstacle pixel.Picture
 }
 
-func NewSpriteBank() (*spriteBank, error) {
+func NewSpriteBank() (*SpriteBank, error) {
 	racer, err := loadPicture("shuttle.png")
 	if err != nil {
 		return nil, fmt.Errorf("load picture: %w", err)
@@ -44,7 +44,7 @@ func NewSpriteBank() (*spriteBank, error) {
 		return nil, fmt.Errorf("load picture: %w", err)
 	}
 
-	return &spriteBank{
+	return &SpriteBank{
 		racer:    racer,
 		obstacle: ob,
 	}, nil
@@ -63,7 +63,7 @@ func loadPicture(path string) (pixel.Picture, error) {
 	return pixel.PictureDataFromImage(img), nil
 }
 
-func Render(rs RenderState, sOld, sNew game.State, w *pixelgl.Window, sb spriteBank) RenderState {
+func Render(rs RenderState, sOld, sNew game.State, w *pixelgl.Window, sb SpriteBank) RenderState {
 	bgBatch := pixel.NewBatch(new(pixel.TrianglesData), nil)
 	renderBackground(w, bgBatch)
 

main.go

@@ -44,35 +44,7 @@ func run() error {
 	stateCA := make(chan game.State)
 	stateCB := make(chan game.State)
 
-	go func(s game.State, sOld game.State, stateC <-chan game.State) {
+	go renderLoop(w, rs, s, sOld, stateCA, sb)
-		var (
-			frames = 0
-			second = time.Tick(time.Second)
-		)
-
-		for !w.Closed() {
-			if rs.Frame == rs.Frames {
-				select {
-				case ss := <-stateCA:
-					sOld = s
-					s = ss
-					rs.Frame = 0
-				default:
-				}
-			}
-
-			rs = gfx.Render(rs, sOld, s, w, *sb)
-			w.Update()
-			frames++
-
-			select {
-			case <-second:
-				w.SetTitle(fmt.Sprintf("%s | FPS: %d", cfg.Title, frames))
-				frames = 0
-			default:
-			}
-		}
-	}(s, sOld, stateCA)
 
 	for !w.Closed() {
 		switch {
@@ -109,3 +81,33 @@ func pixelRun() {
 func main() {
 	pixelgl.Run(pixelRun)
 }
+
+func renderLoop(w *pixelgl.Window, rs gfx.RenderState, s game.State, sOld game.State, stateC <-chan game.State, sb *gfx.SpriteBank) {
+	var (
+		frames = 0
+		second = time.Tick(time.Second)
+	)
+
+	for !w.Closed() {
+		if rs.Frame == rs.Frames {
+			select {
+			case ss := <-stateC:
+				sOld = s
+				s = ss
+				rs.Frame = 0
+			default:
+			}
+		}
+
+		rs = gfx.Render(rs, sOld, s, w, *sb)
+		w.Update()
+		frames++
+
+		select {
+		case <-second:
+			w.SetTitle(fmt.Sprintf("%s | FPS: %d", "Relay", frames))
+			frames = 0
+		default:
+		}
+	}
+}