From 318a25c1f850ed3ad62bfcee82a13d80ccd86e8e Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Fri, 2 Aug 2013 20:24:03 -0400
Subject: Refactor pack-sprite-vertices.

---
 2d/sprite.scm | 88 ++++++++++++++++++++++++-----------------------------------
 1 file changed, 36 insertions(+), 52 deletions(-)

(limited to '2d/sprite.scm')

diff --git a/2d/sprite.scm b/2d/sprite.scm
index b5c3fec..e2a4e4a 100644
--- a/2d/sprite.scm
+++ b/2d/sprite.scm
@@ -58,45 +58,46 @@
 (define r-offset (packed-struct-offset sprite-vertex r))
 (define s-offset (packed-struct-offset sprite-vertex s))
 
+
+
 (define (pack-sprite-vertices vertices offset x y width height origin-x origin-y
-                              scale-x scale-y rotation u v u2 v2 color)
-  (let* ((color (rgba->gl-color color))
-         (local-x1 (* (- origin-x) scale-x))
-         (local-y1 (* (- origin-y) scale-y))
-         (local-x2 (* (- width origin-x) scale-x))
-         (local-y2 (* (- height origin-y) scale-y))
-         (r (vector-ref color 0))
-         (g (vector-ref color 1))
-         (b (vector-ref color 2))
-         (a (vector-ref color 3)))
+                              scale-x scale-y rotation s1 t1 s2 t2 color)
+  (define (pack-sprite x1 y1 x2 y2 x3 y3 x4 y4)
+    (let* ((color (rgba->gl-color color))
+           (r (vector-ref color 0))
+           (g (vector-ref color 1))
+           (b (vector-ref color 2))
+           (a (vector-ref color 3)))
+      ;; Vertices go counter clockwise, starting from the top-left
+      ;; corner.
+      (pack vertices offset sprite-vertex
+            x1 y1
+            r g b a
+            s1 t1)
+      (pack vertices (+ offset 1) sprite-vertex
+            x2 y2
+            r g b a
+            s1 t2)
+      (pack vertices (+ offset 2) sprite-vertex
+            x3 y3
+            r g b a
+            s2 t2)
+      (pack vertices (+ offset 3) sprite-vertex
+            x4 y4
+            r g b a
+            s2 t1)))
+
+  (let ((local-x1 (* (- origin-x) scale-x))
+        (local-y1 (* (- origin-y) scale-y))
+        (local-x2 (* (- width origin-x) scale-x))
+        (local-y2 (* (- height origin-y) scale-y)))
     (if (= rotation 0)
         (begin
           (let ((x1 (+ x local-x1))
                 (y1 (+ y local-y1))
-                (x2 (+ x local-x1))
-                (y2 (+ y local-y2))
-                (x3 (+ x local-x2))
-                (y3 (+ y local-y2))
-                (x4 (+ x local-x2))
-                (y4 (+ y local-y1)))
-            ;; Vertices go counter clockwise, starting from the top-left
-            ;; corner.
-            (pack vertices offset sprite-vertex
-                  x1 y1
-                  r g b a
-                  u v)
-            (pack vertices (+ offset 1) sprite-vertex
-                  x2 y2
-                  r g b a
-                  u v2)
-            (pack vertices (+ offset 2) sprite-vertex
-                  x3 y3
-                  r g b a
-                  u2 v2)
-            (pack vertices (+ offset 3) sprite-vertex
-                  x4 y4
-                  r g b a
-                  u2 v)))
+                (x2 (+ x local-x2))
+                (y2 (+ y local-y2)))
+            (pack-sprite x1 y1 x1 y2 x2 y2 x2 y1)))
         (begin
           (let* ((sin (sin-degrees rotation))
                  (cos (cos-degrees rotation))
@@ -108,24 +109,7 @@
                  (y3 (+ y (* sin local-x2) (* cos local-y2)))
                  (x4 (+ x1 (- x3 x2)))
                  (y4 (- y3 (- y2 y1))))
-            ;; Vertices go counter clockwise, starting from the top-left
-            ;; corner.
-            (pack vertices offset sprite-vertex
-                  x1 y1
-                  r g b a
-                  u v)
-            (pack vertices (+ offset 1) sprite-vertex
-                  x2 y2
-                  r g b a
-                  u v2)
-            (pack vertices (+ offset 2) sprite-vertex
-                  x3 y3
-                  r g b a
-                  u2 v2)
-            (pack vertices (+ offset 3) sprite-vertex
-                  x4 y4
-                  r g b a
-                  u2 v))))))
+            (pack-sprite x1 y1 x2 y2 x3 y3 x4 y4))))))
 
 (define (draw-sprite-vertices texture vertices size)
   (let ((pointer-type (tex-coord-pointer-type float)))
-- 
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