(no commit message)

[gacela.git] / src / gacela_mobs.scm

diff --git a/src/gacela_mobs.scm b/src/gacela_mobs.scm
index ede4235cb653b04fc96f7a1489b21a7e5eff6554..927d8b138af7125823b8b549e1dcf20605211e83 100755 (executable)
--- a/src/gacela_mobs.scm
+++ b/src/gacela_mobs.scm
@@ -51,13 +51,83 @@
 (define (process-mobs mobs)
   (for-each (lambda (m) (m #:render)) mobs))
 
+
+;;; Actions and looks for mobs
+
+(define (get-attr list name default)
+  (let ((value (assoc-ref list name)))
+    (cond (value (car value))
+         (else default))))
+
+(define (attr-def attr)
+  (let ((name (car attr))
+       (value (cadr attr)))
+    `(,name (get-attr attributes ',name ',value))))
+
+(define (attr-save attr)
+  (let ((name (car attr)))
+    `(assoc-set! attributes ',name (list ,name))))
+
+(define-macro (define-action action-head . code)
+  (let ((name (car action-head)) (attr (cdr action-head)))
+    `(define ,name
+       (lambda-action ,attr ,@code))))
+
+(define-macro (lambda-action attr . code)
+  `(lambda (attributes)
+     (let ,(map attr-def attr)
+       ,@code
+       ,(cons 'begin (map attr-save attr))
+       attributes)))
+
+(define-macro (lambda-look . look)
+  (define (process-look look)
+    (cond ((null? look) (values '() '()))
+         (else
+          (let ((line (car look)))
+            (receive (lines images) (process-look (cdr look))
+                     (cond ((string? line)
+                            (let ((var (gensym)))
+                              (values (cons `(draw-texture ,var) lines)
+                                      (cons `(,var (load-texture ,line)) images))))
+                           (else
+                            (values (cons line lines)
+                                    images))))))))
+
+  (receive (look-lines look-images) (process-look look)
+          `(let ,look-images
+               (lambda ()
+                 (glPushMatrix)
+                 ,@look-lines
+                 (glPopMatrix)))))
+
+
+;;; Making mobs
+
 (define-macro (define-mob mob-head . look)
   (let ((name (car mob-head)) (attr (cdr mob-head)))
     `(define ,name
-       (let ((attr ',attr))
-        (lambda (option)
-          (case option
-            ((#:render)
-             (glPushMatrix)
-             ,@(map (lambda (x) (if (string? x) `(draw-image ,x) x)) look)
-             (glPopMatrix))))))))
+       (lambda-mob ,attr ,@look))))
+
+(define-macro (lambda-mob attr . look)
+  `(let ((mob #f))
+     (set! mob
+          (let ((attr ',attr) (actions '()) (renders '()))
+            (lambda (option . params)
+              (case option
+                ((get-attr)
+                 attr)
+                ((set-attr)
+                 (if (not (null? params)) (set! attr (car params))))
+                ((get-actions)
+                 actions)
+                ((set-actions)
+                 (if (not (null? params)) (set! actions (car params))))
+                ((get-renders)
+                 renders)
+                ((set-renders)
+                 (if (not (null? params)) (set! renders (car params))))))))
+     (cond ((not (null? ',look))
+           (display ',look)
+           (newline)))
+     mob))