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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)
"Sets sprite scale-x and scale-y to the same value."
(set-sprite-scale-x! sprite scale)
(set-sprite-scale-y! sprite scale))
(define (load-sprite filename)
"Loads a sprite from file with default position, scaling, and rotation values."
(make-sprite (load-texture filename) 0 0 1 1 0))
(define (draw-sprite sprite)
"Renders a 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))))
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