+;;; Gacela, a GNU Common Lisp extension for fast games development
+;;; Copyright (C) 2009 by Javier Sancho Fernandez <jsf at jsancho dot 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/>.
+
+
+(eval-when (compile load eval)
+ (when (not (find-package 'gacela)) (make-package 'gacela :nicknames '(gg) :use '(lisp)))
+ (in-package 'gacela :nicknames '(gg) :use '(lisp)))
+
+
+;;; Behaviours of objects
+
+(defmacro make-behaviour (name attr &rest code)
+ `(defun ,(get-behaviour-fun-name name) (object)
+ (let ,(mapcar #'attribute-definition attr)
+ ,@code
+ ,(cons 'progn (mapcar #'attribute-save (reverse attr)))
+ object)))
+
+(defun get-behaviour-fun-name (name)
+ (intern (concatenate 'string "BEHAVIOUR-" (string name)) 'gacela))
+
+(defun attribute-name (attribute)
+ (intern (string attribute) 'keyword))
+
+(defun attribute-definition (attribute)
+ (let* ((name (cond ((listp attribute) (car attribute))
+ (t attribute)))
+ (pname (attribute-name name))
+ (value (cond ((listp attribute) (cadr attribute)))))
+ `(,name (getf object ,pname ,value))))
+
+(defun attribute-save (attribute)
+ (let* ((name (cond ((listp attribute) (car attribute))
+ (t attribute)))
+ (pname (attribute-name name)))
+ `(setf (getf object ,pname) ,name)))
+
+
+
+;;; Objects Factory
+
+(let (active-objects objects-to-add objects-to-kill)
+ (defun add-object (object)
+ (push object objects-to-add))
+
+ (defun kill-object (object)
+ (push object objects-to-kill))
+
+ (defun kill-all-objects ()
+ (setq active-objects nil objects-to-add nil objects-to-kill nil))
+
+ (defun refresh-active-objects ()
+ (cond (objects-to-add
+ (setq active-objects (union active-objects objects-to-add))
+ (setq objects-to-add nil)))
+ (cond (objects-to-kill
+ (setq active-objects (reverse (set-difference active-objects objects-to-kill)))
+ (setq objects-to-kill nil))))
+
+ (defun render-boxes ()
+ (labels ((render (l)
+ (cond (l (funcall (render-fun-name (car l)))
+ (render (cdr l))))))
+ (render visible-boxes))))
+
+
+(defmacro make-box (name attr &rest code)
+ `(progn
+ (let ,(union '((rx 0) (ry 0) (rz 0)) attr)
+ (defun ,(render-fun-name name) () ,@code)
+ (defun ,(get-props-fun-name name) () (list :rx rx :ry ry :rz rz)))
+ (add-box ',name)))
+
+(defmacro make-object (name &key attr bhv look)
+ `(let ((object '(:name ,name)))
+ (union object
+ (union ,(make-object-attributes attr)
+ (union ,(make-object-behaviour bhv)
+ ,(make-object-look look))))))
+
+(defun make-object-attributes (attr))
+
+(defun make-object-behaviour (bhv))
+
+(defun make-object-look (look))