Add sprite module.

1 files changed, 72 insertions, 0 deletions

diff --git a/2d/sprite.scm b/2d/sprite.scm
new file mode 100644
index 0000000..78bad6a
--- /dev/null
+++ b/2d/sprite.scm
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+;;; guile-2d
+;;; Copyright (C) 2013 David Thompson <dthompson2@worcester.edu>
+;;;
+;;; Guile-2d is free software: you can redistribute it and/or modify it
+;;; under the terms of the GNU Lesser General Public License as
+;;; published by the Free Software Foundation, either version 3 of the
+;;; License, or (at your option) any later version.
+;;;
+;;; Guile-2d is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; Lesser General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Lesser General Public
+;;; License along with this program.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; 2D sprite procedures.
+;;
+;;; Code:
+
+(define-module (2d sprite)
+  #:use-module (srfi srfi-9)
+  #:use-module (figl gl)
+  #:use-module (2d texture)
+  #:export (make-sprite
+            sprite?
+            sprite-texture
+            sprite-x
+            set-sprite-x!
+            sprite-y
+            set-sprite-y!
+            sprite-scale-x
+            set-sprite-scale-x!
+            sprite-scale-y
+            set-sprite-scale-y!
+            sprite-rotation
+            set-sprite-rotation!
+            set-sprite-scale!
+            load-sprite
+            draw-sprite))
+
+;; The <sprite> object represents a texture with a given position, scale, and
+;; rotation.
+(define-record-type <sprite>
+  (make-sprite texture x y scale-x scale-y rotation)
+  sprite?
+  (texture sprite-texture)
+  (x sprite-x set-sprite-x!)
+  (y sprite-y set-sprite-y!)
+  (scale-x sprite-scale-x set-sprite-scale-x!)
+  (scale-y sprite-scale-y set-sprite-scale-y!)
+  (rotation sprite-rotation set-sprite-rotation!))
+
+(define (set-sprite-scale! sprite scale)
+  (set-sprite-scale-x! sprite scale)
+  (set-sprite-scale-y! sprite scale))
+
+(define (load-sprite filename)
+  (make-sprite (load-texture filename) 0 0 1 1 0))
+
+(define (draw-sprite sprite)
+  (let* ((texture (sprite-texture sprite))
+         (w (texture-width texture))
+         (h (texture-height texture)))
+    (with-gl-push-matrix
+      (gl-translate (sprite-x sprite) (sprite-y sprite) 0)
+      (gl-rotate (sprite-rotation sprite) 0 0 1)
+      (gl-scale (sprite-scale-x sprite) (sprite-scale-y sprite) 0)
+      (texture-quad texture (- (/ w 2)) (- (/ h 2)) w h))))