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-rw-r--r--game.scm26
1 files changed, 15 insertions, 11 deletions
diff --git a/game.scm b/game.scm
index 925562e..74c4da8 100644
--- a/game.scm
+++ b/game.scm
@@ -368,38 +368,42 @@
(abort-to-prompt %script-tag delay))
;; Bullets:
+ (define-type bullet-pool
+ %make-bullet-pool
+ bullet-pool?
+ (length bullet-pool-length set-bullet-pool-length!)
+ (capacity bullet-pool-capacity set-bullet-pool-capacity!)
+ (bullets bullet-pool-bullets set-bullet-pool-bullets!))
;; per bullet: type, x, y, dx, dy
(define %bullet-size (+ 4 8 8 8 8))
(define (make-bullet-pool capacity)
- (let ((pool (make-bytevector (* capacity %bullet-size))))
- (vector 0 capacity pool)))
+ (let ((bullets (make-bytevector (* capacity %bullet-size))))
+ (%make-bullet-pool 0 capacity bullets)))
(define (bullet-pool-offset i)
(* i %bullet-size))
(define (bullet-pool-add! pool type x y dx dy)
(match pool
- (#(length capacity bullets)
+ (#('bullet-pool length capacity bullets)
(let ((offset (bullet-pool-offset length)))
(s32-set! bullets offset type)
(f64-set! bullets (+ offset 4) x)
(f64-set! bullets (+ offset 12) y)
(f64-set! bullets (+ offset 20) dx)
(f64-set! bullets (+ offset 28) dy)
- (vector-set! pool 0 (+ length 1))))))
+ (set-bullet-pool-length! pool (+ length 1))))))
(define (bullet-pool-remove! pool i)
(match pool
- (#(length capacity bullets)
+ (#('bullet-pool length capacity bullets)
(when (and (>= i 0) (< i length))
(let ((at (bullet-pool-offset i))
(start (bullet-pool-offset (- length 1))))
(bytevector-copy! bullets at bullets start (+ start %bullet-size))
- (vector-set! pool 0 (- length 1)))))))
+ (set-bullet-pool-length! pool (- length 1)))))))
(define (bullet-pool-reset! pool)
- (match pool
- (#(length capacity bullets)
- (vector-set! pool 0 0))))
+ (set-bullet-pool-length! pool 0))
(define (bullet-pool-update! pool collide)
(match pool
- (#(length capacity bullets)
+ (#('bullet-pool length capacity bullets)
(let loop ((i 0) (k length))
(when (< i k)
(let* ((offset (bullet-pool-offset i))
@@ -420,7 +424,7 @@
(loop (+ i 1) k)))))))))
(define (draw-bullets pool image w h)
(match pool
- (#(length capacity bullets)
+ (#('bullet-pool length capacity bullets)
(do ((i 0 (+ i 1)))
((= i length))
(let* ((offset (bullet-pool-offset i))