Enable transparency

[gacela.git] / gacela / image.scm

diff --git a/gacela/image.scm b/gacela/image.scm
index 2af2b4b732ab98685fe349488b4ecb0bcf01a749..6acff1dbe0e0d5717f7ae040f6d0de54e4d244f0 100644 (file)
--- a/gacela/image.scm
+++ b/gacela/image.scm
@@ -47,6 +47,9 @@
          (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)
@@ -56,6 +59,7 @@
          (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))