[refactor] represent scene as a vector; [refactor] shared text shader

1 files changed, 11 insertions, 1 deletions

diff --git a/examples/09-ghoulspree.lisp b/examples/09-ghoulspree.lisp
index b3c0106..a92299a 100644
--- a/examples/09-ghoulspree.lisp
+++ b/examples/09-ghoulspree.lisp
@@ -58,6 +58,16 @@ on which boundary VAL is outside of."
     `(loop for (,a . ,more-a) on ,ls do
       (loop for ,b in ,more-a do (progn ,@body)) )))
 
+(defmacro with-pairs ((a b) vector &rest body)
+  (alexandria:with-gensyms (idxa idxb vec)
+    `(loop
+       with ,vec = ,vector
+       for ,idxa from 0 to (- (length ,vec) 2)
+       for ,a = (aref ,vec ,idxa) do
+         (loop for ,idxb from (1+ ,idxa) to (1- (length ,vec))
+               for ,b = (aref ,vec ,idxb) do
+                 (progn ,@body)))))
+
 (defun handle-collision (g1 g2 &optional (friction 0.99))
   (with-slots ((dx1 dx) (dy1 dy) (dr1 dr)) g1
     (with-slots ((dx2 dx) (dy2 dy) (dr2 dr)) g2
@@ -93,7 +103,7 @@ on which boundary VAL is outside of."
               (gravity-on-p app))
             (accelleration
               (/ 9.8 (ww:fps app)))) 
-        (loop for ghoul in (ww::application-scene app)
+        (loop for ghoul across (ww::application-scene app)
               do (advance-pos ghoul)
               when gravity
                 do (apply-gravity-to ghoul accelleration)