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;;; Sly
;;; Copyright © 2016 David Thompson <davet@gnu.org>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program 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
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(use-modules (sly)
(sly render sprite-batch)
(srfi srfi-1))
(load "common.scm")
(define (make-sprite-rects size texture)
(let ((width (texture-width texture))
(height (texture-height texture)))
(list-tabulate size
(lambda _
(make-rect (- (random 640) 32) (- (random 480) 32)
width height)))))
(define (render-sprites batch texture rects)
(lambda (gfx)
(with-sprite-batch batch gfx
(for-each (lambda (rect)
(sprite-batch-add! batch gfx texture rect))
rects))))
(define-signal size 1000)
(define-signal sprites
(let ((texture (on-start (load-texture "images/p1_front.png"))))
(signal-map-maybe render-sprites
(signal-map (lambda (size started?)
(and started? (make-sprite-batch size)))
size game-started?)
texture
(signal-map-maybe make-sprite-rects size texture))))
(define-signal scene
(signal-let ((sprites sprites))
(if sprites
(with-camera (2d-camera #:area (make-rect 0 0 640 480))
sprites)
render-nothing)))
(with-window (make-window #:title "Sprite Batch")
(run-game-loop scene))
;;; Local Variables:
;;; compile-command: "../pre-inst-env guile sprite-batch.scm"
;;; End:
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