X-Git-Url: https://git.jsancho.org/?p=gacela.git;a=blobdiff_plain;f=src%2Fsystem.scm;h=50e9534b451f34c961150745e30bf49f433133ac;hp=d3566652bd0e8e995fe0fe684d4bd6dfdfc3aee1;hb=f3d35ed115ff03f513c93a05325885e44da10891;hpb=1b809e1a58ec2a94903b4b44101d706fd0f27c81

diff --git a/src/system.scm b/src/system.scm
index d356665..50e9534 100644
--- a/src/system.scm
+++ b/src/system.scm
@@ -16,9 +16,34 @@
 
 
 (define-module (gacela system)
+  #:use-module ((bongodb) #:renamer (symbol-prefix-proc 'bongodb:))
   #: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)
+  #:export (define-component
+	    export-component
+	    get-component-type
+	    make-entity-set
+	    entity-list
+	    entity-count
+	    new-entity
+	    get-entity
+	    remove-entity
+	    set-entity
+	    set-entity-components
+	    remove-entity-components
+	    modify-entities
+	    entities-changes
+	    entities-changes?
+	    get-entities-changes
+	    find-entities-by-components
+	    define-system
+	    make-system
+	    join-systems
+	    thread-systems
+	    get-key
+	    get-component))
 
 
 ;;; Component definitions
@@ -28,19 +53,44 @@
    (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))))
+    (define (filtered-args args)
+      (let ((datum (map (lambda (a) (syntax->datum a)) args)))
+	(map (lambda (a) (datum->syntax x a))
+	     (map (lambda (a) (if (list? a) (car a) a))
+		  (filter (lambda (a) (not (keyword? a))) datum)))))
+    (syntax-case x ()
+      ((_ name field ...)
+       (with-syntax ((make-name (concat "make-" #'name))
+		     (make-name-record (concat "make-" #'name "-record"))
+		     (name? (concat #'name "?"))
+		     ((field-name ...) (filtered-args #'(field ...)))
+		     ((field-getter ...) (map (lambda (f) (concat #'name "-" f)) (filtered-args #'(field ...))))
+		     ((field-setter ...) (map (lambda (f) (concat "set-" #'name "-" f "!")) (filtered-args #'(field ...)))))
+         #'(begin
+	     (define* (make-name field ...)
+	       (make-name-record field-name ...))
+	     (define-record-type name
+	       (make-name-record field-name ...)
+	       name?
+	       (field-name field-getter field-setter)
+	       ...)
+	     (set-record-type-printer! name
+	       (lambda (record port)
+		 (format port "#<[~a]" 'name)
+		 (format port " ~a: ~a" 'field-name (field-getter record))
+		 ...
+		 (format port ">")))
+	     'name))))))
 
 (define (export-component component)
   (let ((name (record-type-name component))
@@ -59,116 +109,172 @@
 (define (get-component-type component)
   (record-type-name (record-type-descriptor component)))
 
-(export define-component
-	export-component
-	get-component-type)
-
 
 ;;; Entities and components
 
-(define (register-components entity components clist)
-  (cond ((null? components) clist)
-	(else
-	 (let* ((type (car components))
-		(elist (assoc-ref clist type)))
-	   (register-components entity (cdr components)
-	     (assoc-set! clist type
-	       (cond (elist
-		      (lset-adjoin eq? elist entity))
-		     (else
-		      (list 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))
-
-(define (set-entities new-entities entities components)
-  (cond ((null? new-entities)
-	 (values entities components))
+(define (make-entity-set . changes)
+  (modify-entities (bongodb:make-collection) changes))
+
+(define (entity-list entity-set)
+  (bongodb:find entity-set))
+
+(define (entity-count entity-set)
+  (bongodb:count entity-set))
+
+(define (normalize-components components)
+  (map
+   (lambda (c)
+     (if (record? c)
+	 `(,(get-component-type c) . ,c)
+	 c))
+   components))
+
+(define (entity-ref key entity-set)
+  (hash-get-handle (car entity-set) key))
+
+(define (new-entity entity-set . new-components)
+  (receive (new-set new-keys) (bongodb:insert entity-set (normalize-components new-components))
+    (values new-set (car new-keys))))
+
+(define (get-entity entity-set key)
+  (let ((entity (bongodb:find entity-set (bongodb:$eq '_id key))))
+    (and entity (car entity))))
+
+(define (remove-entity key)
+  (lambda (entity-set)
+    (let ((clist (entity-component-names key entity-set))
+	  (entity (entity-ref key entity-set)))
+      (hash-remove! (car entity-set) key)
+      (unregister-components key clist (cdr entity-set))
+      (values
+       entity-set
+       entity))))
+
+(define (set-entity key . new-components)
+  (lambda (entity-set)
+    (let* ((nc (normalize-components new-components))
+	   (clist (entity-component-names key entity-set))
+	   (nclist (component-names nc)))
+      (hash-set! (car entity-set) key nc)
+      (register-components key
+       (lset-difference eq? nclist clist)
+       (unregister-components key (lset-difference eq? clist nclist) (cdr entity-set)))
+      (values
+       entity-set
+       (cons key nc)))))
+
+(define (set-entity-components key . new-components)
+  (lambda (entity-set)
+    (let ((nc (normalize-components new-components))
+	  (clist (alist-copy (hash-ref (car entity-set) key))))
+      (for-each
+       (lambda (c)
+	 (set! clist (assoc-set! clist (car c) (cdr c))))
+       nc)
+      (hash-set! (car entity-set) key clist)
+      (register-components key (component-names nc) (cdr entity-set))
+      (values
+       entity-set
+       (cons key clist)))))
+
+(define (remove-entity-components key . old-components)
+  (lambda (entity-set)
+    (let ((clist (alist-copy (hash-ref (car entity-set) key))))
+      (for-each
+       (lambda (c)
+	 (set! clist (assoc-remove! clist c)))
+       old-components)
+      (hash-set! (car entity-set) key clist)
+      (unregister-components key old-components (cdr entity-set))
+      (values
+       entity-set
+       (cons key clist)))))
+
+(define (modify-entities entity-set changes)
+  (cond ((null? changes)
+	 entity-set)
 	(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)
+	 (modify-entities ((car changes) entity-set) (cdr changes)))))
 
 
 ;;; Making systems
 
-(define* (find-entities-by-components c t)
-  (cond ((null? t) '())
+(define-record-type entities-changes-type
+  (entities-changes changes)
+  entities-changes?
+  (changes get-entities-changes))
+
+(define (append-changes changes)
+  (entities-changes
+   (apply append
+	  (map get-entities-changes changes))))
+
+(define (find-entities-by-components entity-set clist)
+  (cond ((null? clist) '())
 	(else
-	 (let* ((e (assoc-ref c (car t)))
-		(e* (if e e '())))
-	   (cond ((null? (cdr t)) e*)
-		 (else
-		  (lset-intersection eq? e* (find-entities-by-components c (cdr t)))))))))
-		  
-
-(define (make-system component-types system-fun)
-  (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-fun e**)))
-      (lambda* (#:optional (entities2 #f) (components2 #f))
-	(let ((e (if (and entities2 components2) entities2 entities))
-	      (c (if (and entities2 components2) components2 components)))
-	  (set-entities res e c))))))
-
-
-(export find-entities-by-components
-	make-system)
+	 (let ((e (hash-ref (cdr entity-set) (car clist) '()))
+	       (e* (find-entities-by-components entity-set (cdr clist))))
+	   (if (null? e*)
+	       e
+	       (lset-intersection eq? e e*))))))
+
+(define-syntax make-system
+  (syntax-rules ()
+    ((_ ((name (component-type ...)) ...) form ...)
+     (lambda (entity-set)
+       (let ((name (map (lambda (x)
+			  (cons (car x)
+				(filter (lambda (x)
+					  (memq (car x) '(component-type ...)))
+					(cdr x))))
+			(map (lambda (x)
+			       (entity-ref x entity-set))
+			     (find-entities-by-components entity-set '(component-type ...)))))
+	     ...)
+	 form
+	 ...)))))
+
+(define-syntax define-system
+  (syntax-rules ()
+    ((_ system-name ((name (component-type ...)) ...) form ...)
+     (define system-name
+       (make-system ((name (component-type ...)) ...)
+         form
+	 ...)))))
+
+(define (composed-systems-result results)
+  (let ((changes (filter (lambda (r) (entities-changes? r)) results)))
+    (cond ((null? changes)
+	   (car results))
+	  (else
+	   (append-changes changes)))))
+
+(define (join-systems . systems)
+  (lambda (entity-set)
+    (let run ((s systems) (res '()))
+      (cond ((null? s)
+	     (composed-systems-result res))
+	    (else
+	     (run (cdr s) (cons ((car s) entity-set) res)))))))
+
+(define (thread-systems . systems)
+  (lambda (entity-set)
+    (let run-wait ((thd
+		    (map (lambda (s)
+			   (call-with-new-thread
+			    (lambda () (s entity-set))))
+			 systems))
+		   (res '()))
+      (cond ((null? thd)
+	     (composed-systems-result res))
+	    (else
+	     (run-wait (cdr thd) (cons (join-thread (car thd)) res)))))))
+
+
+;;; Entities and components access inside systems
+
+(define (get-key entity)
+  (car entity))
+
+(define (get-component component-name entity)
+  (assoc-ref (cdr entity) component-name))