Add comments

graphicscontext.go

@@ -45,6 +45,7 @@ func (c *graphicsContext) preUpdate() error {
 }
 
 func (c *graphicsContext) postUpdate() error {
+	// TODO: In WebGL, we don't need to clear the image here.
 	if err := c.defaultRenderTarget.Clear(); err != nil {
 		return err
 	}

internal/graphics/internal/opengl/context.go

@@ -160,7 +160,6 @@ func (c *Context) DeleteFramebuffer(f Framebuffer) {
 func (c *Context) NewShader(shaderType ShaderType, source string) (Shader, error) {
 	s := gl.CreateShader(uint32(shaderType))
 	if s == 0 {
-		println(gl.GetError())
 		return 0, errors.New("glCreateShader failed")
 	}
 

internal/ui/ui_js.go

@@ -243,6 +243,7 @@ func (u *userInterface) start(width, height, scale int, title string) (actualSca
 func (*userInterface) size() (width, height int) {
 	a := canvas.Get("dataset").Get("ebitenActualScale").Int()
 	if a == 0 {
+		// a == 0 only on the initial state.
 		return
 	}
 	width = canvas.Get("width").Int() / a

run.go

@@ -105,9 +105,6 @@ func Run(f func(*Image) error, width, height, scale int, title string) error {
 		}
 		audio.Tick()
 		ui.SwapBuffers()
-		if err != nil {
-			return err
-		}
 
 		// Calc the current FPS.
 		now := ui.Now()