Added some extra display related functions.

allg5/bitmap.go

@@ -220,6 +220,10 @@ func (b *Bitmap) Height() int {
 	return b.height
 }
 
+func (b *Bitmap) IsVideo() bool {
+	return C.al_get_bitmap_flags(b.bitmap)&C.ALLEGRO_VIDEO_BITMAP == C.ALLEGRO_VIDEO_BITMAP
+}
+
 func (b *Bitmap) Image() image.Image {
 	im := image.NewRGBA(image.Rect(0, 0, b.width, b.height))
 	region := C.al_lock_bitmap(b.bitmap, C.ALLEGRO_PIXEL_FORMAT_ABGR_8888, C.ALLEGRO_LOCK_READONLY)

allg5/display.go

@@ -19,6 +19,8 @@ type NewDisplayOptions struct {
 	Windowed   bool
 	Maximized  bool
 	Frameless  bool
+	Shaders    bool
+	OpenGL     bool
 }
 
 // NewDisplay creates a display
@@ -39,6 +41,12 @@ func NewDisplay(width, height int, options NewDisplayOptions) (*Display, error)
 			flags |= C.ALLEGRO_MAXIMIZED
 		}
 	}
+	if options.OpenGL {
+		flags |= C.ALLEGRO_OPENGL
+	}
+	if options.Shaders {
+		flags |= C.ALLEGRO_PROGRAMMABLE_PIPELINE
+	}
 	C.al_set_new_display_flags(flags)
 	d := C.al_create_display(C.int(width), C.int(height))
 	if d == nil {
@@ -47,7 +55,7 @@ func NewDisplay(width, height int, options NewDisplayOptions) (*Display, error)
 	return &Display{d}, nil
 }
 
-// Flips flips the buffer to the display
+// Flip flips the buffer to the display
 func (d *Display) Flip() {
 	C.al_flip_display()
 }

ui/allg5ui/renderer.go

@@ -149,6 +149,8 @@ func (r *Renderer) DefaultTarget() ui.Image {
 	return &uiImage{r.disp.Target()}
 }
 
+func (r *Renderer) Display() *allg5.Display { return r.disp }
+
 func (r *Renderer) DrawImage(im ui.Image, p geom.PointF32) {
 	bmp := r.mustGetBitmap(im)
 	x, y := snap(p)