#:use-module ((sdl2 image) #:prefix sdl2:)
#:use-module ((sdl2 render) #:prefix sdl2:)
#:use-module ((sdl2 surface) #:prefix sdl2:)
+ #:use-module (gl)
#:export (bitmap
- move-xy))
+ move-xy
+ stretch))
(define (bitmap filename)
(make-scene
"bitmap"
(let ((image (sdl2:load-image filename))
- (texture #f))
- (let ((a 0))
- (lambda* (#:key (xy '(0 0)))
- (if (not texture)
- (set! texture (sdl2:surface->texture %sdl-renderer image)))
- (sdl2:clear-renderer %sdl-renderer)
- (sdl2:render-copy %sdl-renderer texture #:dest-rect (sdl2:make-rect (car xy) (cadr xy) (sdl2:surface-width image) (sdl2:surface-height image)))
- (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-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 texture-2d))))))
(define (move-xy x y scene)
(define (to-integer n)
"move-xy"
(lambda ()
(let ((xy (list (to-integer (if (procedure? x) (x) x))
- (to-integer (if (procedure? y) (y) y)))))
+ (to-integer (if (procedure? y) (y) y)))))
(display-scene scene #:xy xy)))))
+
+(define* (stretch scene x #:optional (y x) (z y))
+ (make-scene
+ "stretch"
+ (lambda ()
+ (gl-scale x y z)
+ (display-scene scene))))