Lower case error strings.

Added Position and SetAsTarget method to Display.
Display resize is automatically acknowledged.

allegro5/bitmap.go

@@ -6,7 +6,6 @@ import "C"
 
 import (
 	"errors"
-	"fmt"
 	"image"
 	"image/color"
 	"unsafe"
@@ -56,7 +55,7 @@ type Rotation struct {
 func NewBitmap(width, height int) (*Bitmap, error) {
 	b := C.al_create_bitmap(C.int(width), C.int(height))
 	if nil == b {
-		return nil, fmt.Errorf("Error creating bitmap")
+		return nil, errors.New("error creating bitmap")
 	}
 	return &Bitmap{b, width, height}, nil
 }
@@ -98,7 +97,7 @@ func LoadBitmap(path string) (*Bitmap, error) {
 	defer C.free(unsafe.Pointer(p))
 	b := C.al_load_bitmap(p)
 	if nil == b {
-		return nil, fmt.Errorf("Error loading bitmap")
+		return nil, errors.New("error loading bitmap")
 	}
 	width := int(C.al_get_bitmap_width(b))
 	height := int(C.al_get_bitmap_height(b))

allegro5/display.go

@@ -4,7 +4,7 @@ package allegro5
 import "C"
 
 import (
-	"fmt"
+	"errors"
 	"unsafe"
 )
 
@@ -41,7 +41,7 @@ func NewDisplay(width, height int, options NewDisplayOptions) (*Display, error)
 	C.al_set_new_display_flags(flags)
 	d := C.al_create_display(C.int(width), C.int(height))
 	if nil == d {
-		return nil, fmt.Errorf("Error creating display")
+		return nil, errors.New("error creating display")
 	}
 	return &Display{d}, nil
 }
@@ -59,6 +59,16 @@ func (d *Display) Height() int {
 	return int(C.al_get_display_height(d.display))
 }
 
+func (d *Display) Position() (int, int) {
+	var x, y C.int
+	C.al_get_window_position(d.display, &x, &y)
+	return int(x), int(y)
+}
+
+func (d *Display) SetAsTarget() {
+	C.al_set_target_backbuffer(d.display)
+}
+
 func (d *Display) SetWindowTitle(title string) {
 	t := C.CString(title)
 	defer C.free(unsafe.Pointer(t))

allegro5/event.go

@@ -4,7 +4,7 @@ package allegro5
 import "C"
 
 import (
-	"fmt"
+	"errors"
 	"unsafe"
 )
 
@@ -120,7 +120,7 @@ type MouseMoveEvent struct {
 func NewEventQueue() (*EventQueue, error) {
 	q := C.al_create_event_queue()
 	if nil == q {
-		return nil, fmt.Errorf("Unable to create event queue")
+		return nil, errors.New("unable to create event queue")
 	}
 	return &EventQueue{q}, nil
 }
@@ -152,6 +152,7 @@ func (eq *EventQueue) mapEvent(e *C.ALLEGRO_EVENT) Event {
 		return &DisplayOrientationEvent{eb, toDisplayOrientation(display.orientation)}
 	case C.ALLEGRO_EVENT_DISPLAY_RESIZE:
 		display := (*C.ALLEGRO_DISPLAY_EVENT)(unsafe.Pointer(e))
+		C.al_acknowledge_resize(display.source)
 		return &DisplayResizeEvent{eb, int(display.x), int(display.y), int(display.width), int(display.height)}
 	case C.ALLEGRO_EVENT_MOUSE_AXES:
 		mouse := (*C.ALLEGRO_MOUSE_EVENT)(unsafe.Pointer(e))

allegro5/font.go

@@ -28,7 +28,7 @@ func LoadTTFFont(path string, size int) (*Font, error) {
 
 	f := C.al_load_ttf_font(p, C.int(size), 0)
 	if nil == f {
-		return nil, fmt.Errorf("Unable to load TTF font '%s'", path)
+		return nil, fmt.Errorf("unable to load ttf font '%s'", path)
 	}
 	return &Font{f}, nil
 }

allegro5/system.go

@@ -11,7 +11,7 @@ package allegro5
 import "C"
 
 import (
-	"fmt"
+	"errors"
 )
 
 type InitConfig struct {
@@ -27,25 +27,25 @@ var InitAll = InitConfig{true, true, true, true, true}
 // Init initializes the Allegro system
 func Init(config InitConfig) error {
 	if !bool(C.init()) {
-		return fmt.Errorf("Failed to initialize Allegro")
+		return errors.New("failed to initialize Allegro")
 	}
 	if config.Font && !bool(C.al_init_font_addon()) {
-		return fmt.Errorf("Failed to initialize font addon")
+		return errors.New("failed to initialize font addon")
 	}
 	if config.Font && !bool(C.al_init_ttf_addon()) {
-		return fmt.Errorf("Failed to initialize ttf addon")
+		return errors.New("failed to initialize ttf addon")
 	}
 	if config.Image && !bool(C.al_init_image_addon()) {
-		return fmt.Errorf("Failed to initialize image addon")
+		return errors.New("failed to initialize image addon")
 	}
 	if config.Primitives && !bool(C.al_init_primitives_addon()) {
-		return fmt.Errorf("Failed to initialize primitives addon")
+		return errors.New("failed to initialize primitives addon")
 	}
 	if config.Keyboard && !bool(C.al_install_keyboard()) {
-		return fmt.Errorf("Failed to install keyboard")
+		return errors.New("failed to install keyboard")
 	}
 	if config.Mouse && !bool(C.al_install_mouse()) {
-		return fmt.Errorf("Failed to install mouse")
+		return errors.New("failed to install mouse")
 	}
 	return nil
 }