(define-module (gacela system)
+ #:use-module (ice-9 receive)
#:use-module (srfi srfi-1)
- #:use-module (srfi srfi-9))
+ #:use-module (srfi srfi-9)
+ #:use-module (srfi srfi-9 gnu))
;;; Component definitions
(string-concatenate
(map (lambda (a) (if (symbol? a) (symbol->string a) a)) args))))
-(define-macro (define-component name . args)
- `(begin
- (use-modules (srfi srfi-9) (srfi srfi-9 gnu))
- (define-record-type ,name
- (,(symbol-concatenate "make-" name) ,@args)
- ,(symbol-concatenate name "?")
- ,@(map (lambda (a) (list a (symbol-concatenate name "-" a) (symbol-concatenate "set-" name "-" a "!"))) args))
- (set-record-type-printer! ,name
- (lambda (record port)
- (format port "#<[~a]" ',name)
- ,@(map (lambda (a) `(format port " ~a: ~a" ',a (,(symbol-concatenate name "-" a) record))) args)
- (format port ">")))
- ',name))
+(define-syntax define-component
+ (lambda (x)
+ (define (concat . args)
+ (datum->syntax x
+ (apply symbol-concatenate
+ (map (lambda (a)
+ (if (string? a)
+ a
+ (syntax->datum a)))
+ args))))
+ (syntax-case x ()
+ ((_ name field ...)
+ (with-syntax ((make-name (concat "make-" #'name))
+ (name? (concat #'name "?"))
+ ((field-getter ...) (map (lambda (f) (concat #'name "-" f)) #'(field ...)))
+ ((field-setter ...) (map (lambda (f) (concat "set-" #'name "-" f "!")) #'(field ...))))
+ #'(begin
+ (define-record-type name
+ (make-name field ...)
+ name?
+ (field field-getter field-setter)
+ ...)
+ (set-record-type-printer! name
+ (lambda (record port)
+ (format port "#<[~a]" 'name)
+ (format port " ~a: ~a" 'field (field-getter record))
+ ...
+ (format port ">")))
+ 'name))))))
(define (export-component component)
(let ((name (record-type-name component))
;;; 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)
+ (lambda (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)
+ (lambda (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)
+ (lambda (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)
+ (lambda (entities components)
+ (let ((nc (normalize-components new-components))
+ (clist (alist-copy (assoc-ref entities key))))
+ (for-each
+ (lambda (c)
+ (assoc-set! clist (car c) (cdr c)))
+ nc)
+ (values
+ (assoc-set! entities key clist)
+ (register-components key (map (lambda (c) (car c)) nc) components)))))
+
+(define (remove-entity-components key . old-components)
+ (lambda (entities components)
+ (let ((clist (alist-copy (assoc-ref entities key))))
+ (for-each
+ (lambda (c)
+ (assoc-remove! clist c))
+ old-components)
+ (values
+ (assoc-set! entities key clist)
+ (unregister-components key old-components components)))))
+
+(define (modify-entities changes entities components)
+ (cond ((null? changes)
+ (values entities components))
+ (else
+ (receive (e c) ((car changes) entities components)
+ (modify-entities (cdr changes) e c)))))
+
+(export new-entity
+ remove-entity
+ set-entity
+ set-entity-components
+ remove-entity-components
+ modify-entities)
;;; Making systems
(cond ((null? (cdr t)) e*)
(else
(lset-intersection eq? e* (find-entities-by-components c (cdr t)))))))))
-
-(define (make-system component-types system-fun)
+(define-syntax make-system
+ (syntax-rules ()
+ ((_ component-types system-func)
+ (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 (car x) 'component-types)) (cdr x)))) e*))
+ (res (system-func e**)))
+ (lambda* (#:optional (entities2 #f) (components2 #f))
+ (let ((e (if (and entities2 components2) entities2 entities))
+ (c (if (and entities2 components2) components2 components)))
+ (modify-entities res e c))))))))
+
+(define-syntax define-system
+ (syntax-rules ()
+ ((_ (name . component-types) system-func)
+ (define name (make-system component-types system-func)))))
+
+(define (join-systems . 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*))
- (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 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)
+ define-system
+ make-system
+ join-systems
+ threaded-systems)
+
+
+;;; Entities and components access inside systems
+
+(define (get-key entity)
+ (car entity))
+
+(define (get-component component-name entity)
+ (assoc-ref (cdr entity) component-name))
+
+(export get-key
+ get-component)
projects / gacela.git / blobdiff