X-Git-Url: https://git.jsancho.org/?a=blobdiff_plain;f=gacela%2Fimage.scm;h=236ac744fd420e83bf770e606346c46c02cf0d3a;hb=1a2289c59c999b73d932a60137967961c635c90a;hp=b1ee674bbe501fe38e8b514277665d49c3c2485d;hpb=12725e0c889f28354fc75cfb34683f9323dd04dd;p=gacela.git

diff --git a/gacela/image.scm b/gacela/image.scm
index b1ee674..236ac74 100644
--- a/gacela/image.scm
+++ b/gacela/image.scm
@@ -22,28 +22,70 @@
   #:use-module ((sdl2 image) #:prefix sdl2:)
   #:use-module ((sdl2 render) #:prefix sdl2:)
   #:use-module ((sdl2 surface) #:prefix sdl2:)
-  #:export (bitmap
-	    move-xy))
+  #:use-module (gl)
+  #:export (image
+            move
+            scale
+            over))
 
-(define (bitmap filename)
+(define (calculate proc-or-value)
+  (if (procedure? proc-or-value)
+      (proc-or-value)
+      proc-or-value))
+
+(define (image filename)
   (make-scene
-   "bitmap"
+   "image"
    (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-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))))
+
+(define* (scale scene x #:optional (y x) (z y))
+  (make-scene
+   "scale"
+   (lambda ()
+     (gl-scale (calculate x)
+               (calculate y)
+               (calculate z))
+     (display-scene scene))))
 
-(define (move-xy x y scene)
-  (define (to-integer n)
-    (inexact->exact (round n)))
+(define (over . scenes)
   (make-scene
-   "move-xy"
+   "over"
    (lambda ()
-     (let ((xy (list (to-integer (if (procedure? x) (x) x))
-		     (to-integer (if (procedure? y) (y) y)))))
-       (display-scene scene #:xy xy)))))
+     (let display ((sc scenes))
+       (cond ((not (null? sc))
+              (with-gl-push-matrix
+               (display-scene (car sc)))
+              (display (cdr sc))))))))