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[gacela.git] / gacela_objects.lisp

diff --git a/gacela_objects.lisp b/gacela_objects.lisp
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+;;; 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))