1 ;;; Gacela, a GNU Guile extension for fast games development
2 ;;; Copyright (C) 2013 by Javier Sancho Fernandez <jsf at jsancho dot org>
4 ;;; This program is free software: you can redistribute it and/or modify
5 ;;; it under the terms of the GNU General Public License as published by
6 ;;; the Free Software Foundation, either version 3 of the License, or
7 ;;; (at your option) any later version.
9 ;;; This program is distributed in the hope that it will be useful,
10 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
11 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 ;;; GNU General Public License for more details.
14 ;;; You should have received a copy of the GNU General Public License
15 ;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
18 (define-module (gacela engine)
19 #:use-module (gacela system)
20 #:use-module (ice-9 receive)
21 #:use-module (ice-9 threads)
22 #:use-module (srfi srfi-9)
23 #:use-module (srfi srfi-9 gnu))
26 ;;; Engine definitions
28 (define-record-type engine
29 (make-engine-record entities mutex system)
31 (entities engine-entities set-engine-entities!)
32 (mutex engine-mutex set-engine-mutex!)
33 (system engine-system set-engine-system!))
35 (set-record-type-printer! engine
37 (format port "#<[engine] entities: ~a>"
38 (length (car (engine-entities record))))))
40 (define (make-engine . systems)
44 (if (not (= (length systems) 1))
45 (join-systems systems)
48 (define-syntax define-engine
52 (make-engine system ...)))))
58 ;;; Engine Access Protocol Interface
60 (define current-engine-mutex (make-mutex))
61 (define current-engine-list '())
63 (define (current-engine)
64 (with-mutex current-engine-mutex
65 (assoc-ref current-engine-list (current-thread))))
67 (define (set-current-engine! engine)
68 (with-mutex current-engine-mutex
69 (set! current-engine-list
71 (assoc-set! current-engine-list (current-thread) engine))
73 (assoc-remove! current-engine-list (current-thread)))))))
75 (define* (get-entity key #:key (engine (current-engine)))
76 (assoc key (car (engine-entities engine))))
78 (define-syntax define-entity-setter
81 (define (name! . args)
82 (let ((f (apply name args))
83 (engine (current-engine)))
84 (receive (e c r) (f (car (engine-entities engine)) (cadr (engine-entities engine)))
85 (set-engine-entities! engine (list e c))
88 (define-entity-setter new-entity! new-entity)
89 (define-entity-setter remove-entity! remove-entity)
90 (define-entity-setter set-entity! set-entity)
91 (define-entity-setter set-entity-components! set-entity-components)
92 (define-entity-setter remove-entity-components! remove-entity-components)
94 (define-syntax with-engine
97 (let ((old-engine (current-engine)))
98 (set-current-engine! engine)
99 (let ((res (with-mutex (engine-mutex engine)
102 (set-current-engine! old-engine)
105 (export current-engine
111 set-entity-components!
112 remove-entity-components!