- (texture #f))
- (let ((a 0))
- (lambda ()
- (if (not texture)
- (set! texture (sdl2:surface->texture %sdl-renderer image)))
- ;; (set! a (+ a 1))
- ;; (format #t "~a steps with texture ~a~%" a texture))))))
- (sdl2:clear-renderer %sdl-renderer)
- (sdl2:render-copy %sdl-renderer texture)
- (sdl2:present-renderer %sdl-renderer))))))
+ (texture #f)
+ (w/2 0)
+ (h/2 0))
+ (lambda ()
+ (when (not texture)
+ (set! texture (sdl2:surface->texture %sdl-renderer image))
+ (set! w/2 (/ (sdl2:surface-width image) 2))
+ (set! h/2 (/ (sdl2:surface-height image) 2)))
+ (gl-enable (oes-framebuffer-object texture-2d))
+ (sdl2:bind-texture texture)
+ (gl-enable (oes-framebuffer-object blend))
+ (set-gl-blend-function (blending-factor-src src-alpha)
+ (blending-factor-dest one-minus-src-alpha))
+ (gl-begin (begin-mode quads)
+ (gl-texture-coordinates 0 0)
+ (gl-vertex (- w/2) h/2 0)
+ (gl-texture-coordinates 1 0)
+ (gl-vertex w/2 h/2 0)
+ (gl-texture-coordinates 1 1)
+ (gl-vertex w/2 (- h/2) 0)
+ (gl-texture-coordinates 0 1)
+ (gl-vertex (- w/2) (- h/2) 0))
+ (gl-disable (oes-framebuffer-object blend))
+ (gl-disable (oes-framebuffer-object texture-2d))))))
+
+(define* (move scene x y #:optional (z 0))
+ (make-scene
+ "move"
+ (lambda ()
+ (gl-translate (calculate x)
+ (calculate y)
+ (calculate z))
+ (display-scene scene))))