(define-module (gacela system)
+ #:use-module (ice-9 receive)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9))
;;; 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 (normalize-components components)
+ (map
+ (lambda (c)
+ (if (record? c)
+ `(,(get-component-type c) . ,c)
+ c))
+ components))
-(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))
+ (nc (normalize-components new-components)))
+ (values
+ (acons key nc entities)
+ (register-components key
+ (map (lambda (c) (car c)) nc)
+ 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* ((nc (normalize-components new-components))
+ (clist (map (lambda (c) (car c)) (assoc-ref entities key)))
+ (nclist (map (lambda (c) (car c)) nc)))
+ (values
+ (assoc-set! entities key nc)
+ (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)) (normalize-components new-components)) entities components))
+
+(define (set-entities new-entities entities components)
+ (cond ((null? new-entities)
+ (values entities components))
+ (else
+ (cond ((not (caar new-entities))
+ (receive (e c k) (new-entity (cdar new-entities) entities components)
+ (set-entities (cdr new-entities) e c)))
+ ((not (cdar new-entities))
+ (receive (e c) (remove-entity (caar new-entities) entities components)
+ (set-entities (cdr new-entities) e c)))
+ (else
+ (receive (e c) (set-entity-components (caar new-entities) (cdar new-entities) entities components)
+ (set-entities (cdr new-entities) e c)))))))
+
+
+(export new-entity
+ remove-entity
+ set-entity
+ set-entity-components
+ set-entities)
;;; Making systems
(lambda (entities components)
(let* ((e (find-entities-by-components components component-types))
(e* (map (lambda (x) (assoc x entities)) e))
- (e** (map (lambda (x) (cons (car x) (filter (lambda (x) (memq (get-component-type x) component-types)) (cdr x)))) e*))
+ (e** (map (lambda (x) (cons (car x) (filter (lambda (x) (memq (car x) component-types)) (cdr x)))) e*))
(res (system-fun e**)))
(lambda* (#:optional (entities2 #f) (components2 #f))
- (let* ((e2 (if (and entities2 components2)
- (find-entities-by-components components2 component-types)
- e))
- (e2* (if (and entities2 components2)
- (map (lambda (x) (assoc x entities2)) e2)
- e*))
- (e2** (if (and entities2 components2)
- (map (lambda (x) (cons (car x) (filter (lambda (x) (memq (get-component-type x) component-types)) (cdr x)))) e2*)
- e**)))
- e2**)))))
-
-; ((1 a b) (2 a b c) (3 c))
-; ((1 a b) (2 a b))
-; ((1 a) (a b))
-; ((1 a) (3 c) (4 a b))
+ (let ((e (if (and entities2 components2) entities2 entities))
+ (c (if (and entities2 components2) components2 components)))
+ (set-entities res e c))))))
+
+
+(define (join-systems . systems)
+ (lambda (entities components)
+ (let run ((s systems) (e entities) (c components))
+ (cond ((null? s)
+ (values e c))
+ (else
+ (receive (e2 c2) (((car s) e c))
+ (run (cdr s) e2 c2)))))))
+
+
+(define (threaded-systems . systems)
+ (lambda (entities components)
+ (let run-wait ((thd
+ (map
+ (lambda (s)
+ (call-with-new-thread
+ (lambda () (s entities components))))
+ systems))
+ (e entities) (c components))
+ (cond ((null? thd)
+ (values e c))
+ (else
+ (receive (e2 c2) ((join-thread (car thd)) e c)
+ (run-wait (cdr thd) e2 c2)))))))
+
(export find-entities-by-components
- make-system)
+ make-system
+ join-systems
+ threaded-systems)