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;;; Lisparuga
;;; Copyright © 2020 David Thompson <dthompson2@worcester.edu>
;;;
;;; Lisparuga 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.
;;;
;;; Lisparuga 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 Lisparuga. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Abstraction for loading game data from the file system, including
;; automatically reloading the data when it changes.
;;
;;; Code:
(define-module (lisparuga asset)
#:use-module (chickadee render texture)
#:use-module (ice-9 ftw)
#:use-module (ice-9 match)
#:use-module (oop goops)
#:use-module (srfi srfi-1)
#:use-module (lisparuga inotify)
#:export (<asset>
artifact
file-name
loader
args
watch-assets
watching-assets?
watch-asset-directory
reload-modified-assets
clear-asset-cache
asset-ref
define-asset
load-tile-atlas))
(define-class <asset> ()
(watch? #:allocation #:class #:init-form #f)
;; class slots for asset cache and live reloading
(inotify #:allocation #:class #:init-form #f)
;; file-name -> assets mapping
(asset-file-map #:allocation #:class #:init-form (make-hash-table))
;; args -> artifact mapping
(artifact-cache #:allocation #:class #:init-form (make-weak-value-hash-table))
;; asset -> artifact mapping
(asset-artifact-map #:allocation #:class #:init-form (make-weak-key-hash-table))
(watches #:allocation #:class #:init-form '())
;; instance slots
(file-name #:getter file-name #:init-keyword #:file-name)
(loader #:getter loader #:init-keyword #:loader)
(loader-args #:getter loader-args #:init-form '()
#:init-keyword #:loader-args))
(define (absolute-file-name file-name)
(if (absolute-file-name? file-name)
file-name
(string-append (getcwd) "/" file-name)))
(define-method (initialize (asset <asset>) initargs)
(next-method)
;; Convert file name to an absolute file name.
(slot-set! asset 'file-name (absolute-file-name (file-name asset)))
;; Add asset to the file-name -> asset map
(let* ((asset-file-map (class-slot-ref <asset> 'asset-file-map))
;; Using a weak key hash table instead of a list to keep
;; track of all the assets that are associated with a file.
;; This way, their presence in the cache won't save them from
;; the GC.
(sub-table (or (hash-ref asset-file-map (file-name asset))
(let ((wt (make-weak-key-hash-table)))
(hash-set! asset-file-map (file-name asset) wt)
wt))))
(hash-set! sub-table asset asset)))
(define (asset-inotify)
(class-slot-ref <asset> 'inotify))
(define (asset-file-map)
(class-slot-ref <asset> 'asset-file-map))
(define (artifact-cache)
(class-slot-ref <asset> 'artifact-cache))
(define (asset-artifact-map)
(class-slot-ref <asset> 'asset-artifact-map))
(define (asset-watches)
(class-slot-ref <asset> 'watches))
(define (watch-assets watch?)
(let ((old-watch? (watching-assets?)))
(class-slot-set! <asset> 'watch? watch?)
(cond
;; Watching is being turned on.
((and watch? (not old-watch?))
;; Retroactively add watches for all existing assets.
(hash-for-each (lambda (file-name assets)
(watch-asset-directory (dirname file-name)))
(asset-file-map)))
;; Watching is being turned off.
((and (not watch?) old-watch?)
;; Deactive inotify watches.
(for-each inotify-watch-remove! (inotify-watches (asset-inotify)))))))
(define (watching-assets?)
(class-slot-ref <asset> 'watch?))
(define (directory-watched? dir)
(find (lambda (watch)
(string=? (inotify-watch-file-name watch) dir))
(asset-watches)))
(define (watch-asset-directory dir)
;; Lazily activate inotify.
(unless (asset-inotify)
(class-slot-set! <asset> 'inotify (make-inotify)))
;; Add watch if it doesn't already exist.
(unless (directory-watched? dir)
(class-slot-set! <asset> 'watches
(cons (inotify-add-watch! (asset-inotify)
dir
'(create close-write moved-to))
(asset-watches)))))
(define (reload-modified-assets)
(let ((inotify (asset-inotify)))
(when inotify
(while (inotify-pending-events? inotify)
(let* ((event (inotify-read-event inotify))
(type (inotify-event-type event))
(file-name (string-append (inotify-watch-file-name
(inotify-event-watch event))
"/"
(inotify-event-file-name event)))
(assets (hash-ref (asset-file-map) file-name)))
(cond
((and assets (or (eq? type 'close-write) (eq? type 'moved-to)))
;; Expire everything from cache, then reload.
(hash-for-each (lambda (key asset)
(expire-cached-artifact (cache-key asset)))
assets)
(hash-for-each (lambda (key asset)
(load! asset))
assets))))))))
(define (cache-key asset)
(list (loader asset) (file-name asset) (loader-args asset)))
(define (cache-artifact key artifact)
(hash-set! (artifact-cache) key artifact))
(define (expire-cached-artifact key)
(hash-remove! (artifact-cache) key))
(define (clear-asset-cache)
(hash-clear! (artifact-cache))
(hash-clear! (asset-artifact-map)))
(define (fetch-cached-artifact key)
(hash-ref (artifact-cache) key))
(define (load-artifact cache-key loader file-name loader-args add-watch?)
(or (fetch-cached-artifact cache-key)
(let ((artifact (apply loader file-name loader-args)))
(cache-artifact cache-key artifact)
(when (and add-watch? (watching-assets?))
(watch-asset-directory (dirname file-name)))
artifact)))
(define* (load! asset #:optional add-watch?)
(let ((thing (load-artifact (cache-key asset)
(loader asset)
(file-name asset)
(loader-args asset)
add-watch?)))
(hashq-set! (asset-artifact-map) asset thing)
thing))
(define-method (asset-ref (asset <asset>))
;; Assets are lazy-loaded upon first access.
(or (hashq-ref (asset-artifact-map) asset)
(load! asset #t)))
;; Make assets that are outside of the cache "just work".
(define-method (asset-ref x) x)
;; Handy syntax for defining new assets.
(define-syntax-rule (define-asset name
(loader file-name loader-args ...))
(define name
(make <asset>
#:file-name file-name
#:loader loader
#:loader-args (list loader-args ...))))
;; Convenience procedure for loading tilesets
(define* (load-tile-atlas file-name tile-width tile-height
#:key (margin 0) (spacing 0))
(split-texture (load-image file-name) tile-width tile-height
#:margin margin #:spacing spacing))
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