;;; Entities and components
-(define (new-entity new-components entities components)
- (let ((key (gensym)))
- (values
- (acons key (map (lambda (c) `(,(get-component-type c) . ,c)) new-components) entities)
- (register-components key new-components components)
- key)))
-
-(define* (register-components entity components clist)
+(define (register-components entity components clist)
(cond ((null? components) clist)
(else
- (let* ((type (get-component-type (car components)))
+ (let* ((type (car components))
(elist (assoc-ref clist type)))
(register-components entity (cdr components)
(assoc-set! clist type
(else
(list entity)))))))))
-(export new-entity)
+(define (unregister-components entity components clist)
+ (cond ((null? components) clist)
+ (else
+ (let* ((type (car components))
+ (elist (lset-difference eq? (assoc-ref clist type) (list entity))))
+ (unregister-components entity (cdr components)
+ (cond ((null? elist)
+ (assoc-remove! clist type))
+ (else
+ (assoc-set! clist type elist))))))))
+
+(define (new-entity new-components entities components)
+ (let ((key (gensym)))
+ (values
+ (acons key new-components entities)
+ (register-components key
+ (map (lambda (c) (car c)) new-components)
+ components)
+ key)))
+
+(define (remove-entity key entities components)
+ (let ((clist (map (lambda (c) (car c)) (assoc-ref entities key))))
+ (values
+ (assoc-remove! entities key)
+ (unregister-components key clist components))))
+
+(define (set-entity key new-components entities components)
+ (let ((clist (map (lambda (c) (car c)) (assoc-ref entities key)))
+ (nclist (map (lambda (c) (car c)) new-components)))
+ (values
+ (assoc-set! entities key new-components)
+ (register-components key (lset-difference eq? nclist clist)
+ (unregister-components key (lset-difference eq? clist nclist) components)))))
+
+(define (set-entity-components key new-components entities components)
+ (define (set-components clist new-components)
+ (cond ((null? new-components)
+ clist)
+ (else
+ (set-components
+ (if (cdar new-components)
+ (assoc-set! clist (caar new-components) (cdar new-components))
+ (assoc-remove! clist (caar new-components)))
+ (cdr new-components)))))
+ (set-entity key (set-components (alist-copy (assoc-ref entities key)) new-components) entities components))
+
+
+(export new-entity
+ remove-entity
+ set-entity
+ set-entity-components)
;;; Making systems