Added support for borderless windows.

allg5ui/rendererfactory.go

@@ -13,6 +13,7 @@ type rendererFactory struct{}
 
 func (f rendererFactory) New(title string, width, height int, opts ui.NewRendererOptions) (ui.Renderer, error) {
 	renderer, err := NewRenderer(width, height, allg5.NewDisplayOptions{
+		Frameless: opts.Borderless,
 		Resizable: opts.Resizable,
 		Vsync:     opts.VSync,
 	})

sdlui/renderer.go

@@ -33,6 +33,7 @@ var _ ui.Renderer = &Renderer{}
 var _ ui.Texture = &Renderer{}
 
 type NewRendererOptions struct {
+	Borderless bool
 	Location   sdl.Point
 	Resizable  bool
 	VSync      bool
@@ -57,6 +58,9 @@ func NewRenderer(title string, width, height int32, opts NewRendererOptions) (*R
 	}
 	sdl.SetHint(sdl.HINT_RENDER_SCALE_QUALITY, "1")
 	windowFlags := uint32(sdl.WINDOW_SHOWN)
+	if opts.Borderless {
+		windowFlags |= sdl.WINDOW_BORDERLESS
+	}
 	if opts.Resizable {
 		windowFlags |= sdl.WINDOW_RESIZABLE
 	}

sdlui/rendererfactory.go

@@ -18,6 +18,7 @@ func (f rendererFactory) New(title string, width, height int, opts ui.NewRendere
 		location.Y = int32(opts.Location.Y)
 	}
 	return NewRenderer(title, int32(width), int32(height), NewRendererOptions{
+		Borderless: opts.Borderless,
 		Location:   location,
 		Resizable:  opts.Resizable,
 		VSync:      opts.VSync,

ui/rendererfactory.go

@@ -41,6 +41,7 @@ func SetRendererFactory(factory RendererFactory) {
 // NewRendererOptions provides options when creating a new renderer.
 type NewRendererOptions struct {
 	Location   *geom.PointF32
+	Borderless bool
 	Resizable  bool
 	VSync      bool
 }