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(in-package #:gol)
(asdf:load-systems :alexandria
:sdl2)
(use-package :alexandria)
(deftype grid (width height)
`(array integer (,width ,height)))
(defun next-generation (grid result)
(assert (equal (array-dimensions grid) (array-dimensions result)))
(destructuring-bind (m n) (array-dimensions grid)
(flet ((cell-value (i j)
(- (loop :for u :from (1- i) :repeat 3
:summing
(loop :for v :from (1- j) :repeat 3
:summing (aref grid (mod u m) (mod v n))))
(aref grid i j))))
(dotimes (i m)
(dotimes (j n)
(let ((x (aref grid i j))
(y (cell-value i j)))
(setf (aref result i j)
(if (zerop x)
(if (= y 3) 1 0)
(if (or (= y 2) (= y 3)) 1 0)))))))))
(defun draw-grid (renderer grid &key (cell-w 10) (cell-h 10))
(destructuring-bind (m n) (array-dimensions grid)
(dotimes (i m)
(dotimes (j n)
(let ((rect (sdl2:make-rect (* i cell-h) (* j cell-w) cell-w cell-h)))
(sdl2:render-draw-rect renderer rect)
(unless (zerop (aref grid i j))
(sdl2:render-fill-rect renderer rect)))))))
(defun run ()
(sdl2:with-init (:everything)
(sdl2:with-window (window)
(sdl2:with-renderer (renderer window)
(sdl2:with-event-loop ()
(:idle ()
(sdl2:set-render-draw-color renderer 255 255 255 255)
(sdl2:render-clear renderer)
(sdl2:set-render-draw-color renderer 0 0 0 255)
(draw-grid renderer *grid1*)
(sdl2:render-present renderer)
(sdl2:delay 200)
(next-generation *grid1* *grid2*)
(rotatef *grid1* *grid2*))
(:quit () t))))))
(defparameter *grid1* (make-array '(20 20) :initial-element 0))
(defparameter *grid2* (make-array '(20 20) :initial-element 0))
(setf (aref *grid1* 0 0) 1
(aref *grid1* 1 0) 1
(aref *grid1* 1 1) 1
(aref *grid1* 2 1) 1
(aref *grid1* 0 2) 1)
(run)
*grid1*
*grid2*
(progn
(next-generation *grid1* *grid2*)
(rotatef *grid1* *grid2*)
*grid2*)
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