#:use-module (srfi srfi-9 gnu))
-;;; Engine Properties
-
-(define* (get-property property-path #:key (engine (current-engine)))
- (let ((entities (get-entities-by-components (list (car property-path)) #:engine engine)))
- (cond ((null? entities)
- #f)
- (else
- (let loop ((property (get-component (car property-path) (car entities)))
- (path (cdr property-path)))
- (cond ((or (null? path) (not property))
- property)
- (else
- (loop (assoc-ref property (car path)) (cdr path)))))))))
-
-(define* (set-property! property-path value #:key (engine (current-engine)))
- (define (loop property path)
- (cond ((null? path)
- value)
- (else
- (assoc-set! (or property '()) (car path) (loop (assoc-ref property (car path)) (cdr path))))))
-
- (let ((entities (get-entities-by-components (list (car property-path)) #:engine engine)))
- (cond ((null? entities)
- (new-entity! `(,(car property-path) . ,(loop '() (cdr property-path)))))
- (else
- (set-entity-components! (get-key (car entities)) `(,(car property-path) . ,(loop (get-component (car property-path) (car entities)) (cdr property-path))))))))
-
-(export get-property
- set-property!)
-
-
;;; Engine Inner Properties
(define (default-step) 0.1)
;;; Engine definitions
(define-record-type engine
- (make-engine-record entities mutex running-mutex system)
+ (make-engine-record entities mutex running-mutex systems)
engine?
(entities engine-entities set-engine-entities!)
(mutex engine-mutex set-engine-mutex!)
(running-mutex engine-running-mutex set-engine-running-mutex!)
- (system engine-system set-engine-system!))
+ (systems engine-systems set-engine-systems!))
(set-record-type-printer! engine
(lambda (record port)
(format port "#<[engine] state: ~a, entities: ~a>"
(if (engine-running? record) "Running" "Stopped")
- (length (car (engine-entities record))))))
+ (entity-count (engine-entities record)))))
(define (make-engine . systems)
(make-engine-record
- (receive (e c) ((new-entity (default-engine-inner-properties)) '() '())
- (list e c))
+ (make-entity-set (new-entity (default-engine-inner-properties)))
(make-mutex)
(make-mutex)
- (apply group-systems systems)))
+ systems))
(define-syntax define-engine
(syntax-rules ()
engine-running?)
-;;; Engine Access Protocol Interface
-
-(define current-engine-mutex (make-mutex))
-(define current-engine-list '())
-
-(define (current-engine)
- (with-mutex current-engine-mutex
- (assoc-ref current-engine-list (current-thread))))
-
-(define (set-current-engine! engine)
- (with-mutex current-engine-mutex
- (set! current-engine-list
- (cond (engine
- (assoc-set! current-engine-list (current-thread) engine))
- (else
- (assoc-remove! current-engine-list (current-thread)))))))
-
-(define* (get-entity key #:key (engine (current-engine)))
- (assoc key (car (engine-entities engine))))
-
-(define* (get-entities-by-components component-types #:key (engine (current-engine)))
- (map (lambda (e)
- (get-entity e #:engine engine))
- (find-entities-by-components (cadr (engine-entities engine)) component-types)))
-
-(define-syntax define-entity-setter
- (syntax-rules ()
- ((_ name! name)
- (define (name! . args)
- (let ((f (apply name args))
- (engine (current-engine)))
- (receive (e c r) (f (car (engine-entities engine)) (cadr (engine-entities engine)))
- (set-engine-entities! engine (list e c))
- r))))))
-
-(define-entity-setter new-entity! new-entity)
-(define-entity-setter remove-entity! remove-entity)
-(define-entity-setter set-entity! set-entity)
-(define-entity-setter set-entity-components! set-entity-components)
-(define-entity-setter remove-entity-components! remove-entity-components)
-
-(define-syntax with-engine
- (syntax-rules ()
- ((_ engine body ...)
- (let ((old-engine (current-engine)))
- (set-current-engine! engine)
- (let ((res (with-mutex (engine-mutex engine)
- body
- ...)))
- (set-current-engine! old-engine)
- res)))))
-
-(define (set-engine-systems! engine . systems)
- (with-mutex (engine-mutex engine)
- (set-engine-system! engine (apply group-systems systems))))
-
-(export current-engine
- set-current-engine!
- get-entity
- get-entities-by-components
- new-entity!
- remove-entity!
- set-entity!
- set-entity-components!
- remove-entity-components!
- with-engine
- set-engine-systems!)
-
-
;;; Engine execution
(define (start-engine engine)
(let ((t (current-utime))
(delay 0)
(halt #f))
- (with-engine engine
- (receive (e c) ((apply (engine-system engine) (engine-entities engine)))
- (set-engine-entities! engine (list e c)))
- (set! delay (- (inexact->exact (* (get-property '(engine-inner-properties step)) 1000000))
+ (with-mutex (engine-mutex engine)
+ (for-each
+ (lambda (s) (eval-system s engine))
+ (engine-systems engine))
+ (set! delay (- (inexact->exact (* (engine-property engine 'step) 1000000))
(- (current-utime) t)))
- (set! halt (engine-stopping? #:clean #t)))
+ (set! halt (engine-stopping? engine #:clean #t)))
(cond ((not halt)
(cond ((> delay 0)
(usleep delay)))
(loop)))))))))
+(define (eval-system system engine)
+ (call-with-values
+ (lambda () (system (engine-entities engine)))
+ (lambda vals
+ (let ((changes (car vals)))
+ (cond ((entities-changes? changes)
+ (set-engine-entities! engine
+ (modify-entities (engine-entities engine)
+ (get-entities-changes changes))))))
+ (apply values vals))))
+
+(define-syntax with-engine
+ (syntax-rules ()
+ ((_ engine component-types form ...)
+ (with-mutex (engine-mutex engine)
+ (eval-system (make-system component-types form ...) engine)))))
+
(define (stop-engine engine)
- (with-engine engine
- (new-entity! '(engine-halt . #t)))
+ (with-engine engine ()
+ (entities-changes
+ (list
+ (new-entity '(engine-halt . #t)))))
'engine-halt)
-(define* (engine-stopping? #:key (engine (current-engine)) (clean #f))
- (let ((halt #f))
- (let halt-engine ((halts (get-entities-by-components '(engine-halt))))
- (cond ((not (null? halts))
- (set! halt #t)
- (cond (clean
- (remove-entity! (caar halts))
- (halt-engine (cdr halts)))))))
- halt))
+(define* (engine-stopping? engine #:key (clean #f))
+ (let ((halts (eval-system
+ (make-system ((halt (engine-halt))) halt)
+ engine)))
+ (cond ((and clean (not (null? halts)))
+ (eval-system
+ (make-system () (entities-changes (map (lambda (h) (remove-entity (car h))) halts)))
+ engine)))
+ (not (null? halts))))
(export start-engine
- stop-engine
- engine-stopping?)
+ with-engine
+ stop-engine)
+
+
+;;; Properties
+
+(define (engine-property engine name)
+ (eval-system
+ (make-system ((props (engine-inner-properties)))
+ (assoc-ref
+ (assoc-ref (cdar props) 'engine-inner-properties)
+ name))
+ engine))
+
+(define (set-engine-property! engine name value)
+ (eval-system
+ (make-system ((props (engine-inner-properties)))
+ (entities-changes
+ (list
+ (set-entity (caar props)
+ (car
+ (assoc-set! (cdar props) 'engine-inner-properties
+ (assoc-set! (assoc-ref (cdar props) 'engine-inner-properties)
+ name
+ value)))))))
+ engine)
+ value)
+
+(export engine-property
+ set-engine-property!)
projects / gacela.git / blobdiff