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;;; Sly
;;; Copyright (C) 2014 David Thompson <dthompson2@worcester.edu>
;;;
;;; 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/>.
;;; Commentary:
;;
;; Asset cache.
;;
;;; Code:
(define-module (sly cache)
#:use-module (srfi srfi-9)
#:export (make-cache
cache?
cache-ref
cache-set!
cached?
cached))
(define-record-type <cache>
(%make-cache table max-size)
cache?
(table cache-table)
(max-size cache-max-size))
(define (make-cache max-size)
(%make-cache (make-weak-key-hash-table) max-size))
(define (cache-miss! cache proc args)
(let ((results (call-with-values (lambda ()
(apply proc args))
list)))
(hash-set! (cache-table cache) (cons proc args) results)
results))
(define (cache-ref cache proc args)
(hash-ref (cache-table cache) (cons proc args)))
(define (cached cache proc . args)
(apply values (or (cache-ref cache proc args)
(cache-miss! cache proc args))))
(define (cache-clear! cache)
(hash-clear! (cache-table cache)))
(define-syntax-rule (define-cached (name arg ...)
default-cache docstring body ...)
(define (name arg ...)
docstring
(cached default-cache (lambda (arg ...) body ...) arg ...)))
(define font-cache (make-cache 100))
(define-cached (load-font filename) font-cache
"Hello."
(display "load!\n")
(format #f "loaded font ~a" filename))
(define texture-cache (make-cache 100))
(define (%load-texture filename)
(display "load!\n")
(format #f "~a loaded" filename))
(define (load-texture filename)
(cached texture-cache %load-texture filename))
(load-texture "foo.jpg")
(cached texture-cache "bar" (load-texture "foo"))
(define-cached (load-texture filename)
())
(load-cache 'image "images/p1_front.png")
(load-asset cache 'font "fonts/sans.ttf" 16)
(load-asset 'clear)
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