main.scm 10.7 KB
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(add-to-load-path "/usr/local/share/guile/site/2.2/")

(use-modules (srfi srfi-1)
             (srfi srfi-9)

             (ice-9 threads)
             (oop goops)

             (sdl2)
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             (sdl2 ttf)
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             (sdl2 video)
             (sdl2 rect)
             (sdl2 render)
             (sdl2 surface)
             (sdl2 events)
             )

(define-public *unspecified* ((@ (guile) if) #f #f))

(define-syntax set!
  (syntax-rules (=)
    ((_) *unspecified*)

    ((_ field = (op args ...) rest ...)
     (begin ((@ (guile) set!) field (op field args ...))
            (set! rest ...)))

    ((_ field proc)
     ((@ (guile) set!) field proc))

    ((_ field proc rest ...)
     (begin ((@ (guile) set!) field proc) (set! rest ...)))))

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(define (signum x)
  (cond ((zero? x) 0)
        ((positive? x) 1)
        (else -1)))

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(define (parse-map spec)
  (let ((arr (make-array #f (length spec) (string-length (car spec)))))
    (array-index-map! arr
                      (lambda (i j)
                        (case (string-ref (list-ref spec i) j)
                          ((#\space) 'space)
                          ((#\#) 'wall))))
    arr))

(define game-map
  (parse-map
   '("########"
     "#      #"
     "#  ### #"
     "#  #   #"
     "########")))

(define-values (board-height board-width)
  (apply values (array-dimensions game-map)))

(define (cross-product l1 l2)
  (concatenate
   (map (lambda (a)
          (map (lambda (b) (list a b))
               l2))
        l1)))

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(define pi 3.141592653589793)
(define tau (* 2 pi))
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(define-class <v3> ()
  (x #:accessor x #:init-keyword #:x)
  (y #:accessor y #:init-keyword #:y)
  (z #:accessor z #:init-keyword #:z))
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(define* (v3 #:optional (x 0) (y 0) (z 0))
  (make <v3> #:x x #:y y #:z z))
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(define-method (+ (v <v3>) (u <v3>))
  (v3 (+ (x v) (x u))
      (+ (y v) (y u))
      (+ (z v) (z u))))

(define-method (* (a <number>) (v <v3>))
  (v3 (* a (x v))
      (* a (y v))
      (* a (z v))))
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(define (vector-length v)
  (sqrt (+ (* (x v) (x v))
           (* (y v) (y v))
           (* (z v) (z v)))))

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(define-class <player> ()
  (pos #:accessor p #:init-form (v3 1 1))
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  (angle #:accessor a #:init-value 0)
  (feild-of-view #:accessor fov #:init-value (/ tau 6)))
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(define (get-t)
  (define t (gettimeofday))
  (+ (cdr t) (* 1000000 (car t))))

(define current-tile-size (make-parameter 50))
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(define current-renderer (make-parameter #f))

(define int (compose inexact->exact floor))

(define (draw-line x1 y1 x2 y2)
  (render-draw-line
   (current-renderer)
   (int (* (current-tile-size) x1)) (int (* (current-tile-size) y1))
   (int (* (current-tile-size) x2)) (int (* (current-tile-size) y2))))

(define (fill-rect x y w h)
 (render-fill-rect
  (current-renderer)
  (make-rect (int (* (current-tile-size) x))
             (int (* (current-tile-size) y))
             (int (* (current-tile-size) w))
             (int (* (current-tile-size) h)))))

(define (draw-line x1 y1 x2 y2)
  (render-draw-line
   (current-renderer)
   (int (* x1 (current-tile-size))) (int (* y1 (current-tile-size)))
   (int (* x2 (current-tile-size))) (int (* y2 (current-tile-size)))))

(define (make-rect* x y w h)
  (make-rect (int (* x (current-tile-size)))
             (int (* y (current-tile-size)))
             (int (* w (current-tile-size)))
             (int (* h (current-tile-size)))))

(define (fill-rects rects)
  (render-fill-rects (current-renderer) rects))

(define* (set-draw-color r g b #:optional (a #xFF))
  (set-render-draw-color (current-renderer) r g b a))

(define (clear)
  (clear-renderer (current-renderer)))

(define (present)
  (present-renderer (current-renderer)))

(define player (make <player> #:x 1 #:y 1 #:a 0))
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(define ray-count 64)
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(define keys-down (make-parameter '()))

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(define current-font (make-parameter #f))

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(define cached-rays #f)

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(define (update dt)

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  (let ((ev (poll-event)))
    (cond #; [(keyboard-event-repeat? ev) #f] ;; TODO implement in bindings
     [(and (keyboard-down-event? ev)
           (not (memv (keyboard-event-scancode ev)
                   (keys-down))))
      (keys-down (cons (keyboard-event-scancode ev)
                       (keys-down)))]
     [(keyboard-up-event? ev)
      (keys-down (delv (keyboard-event-scancode ev)
                       (keys-down)))]))


  (let ((ret
         (fold (lambda (key ret)
                 (case key
                   ((x q) 'game-end)
                   ((w) (set! (p player) = (+ (* dt 0.000003
                                                 (v3 (cos (a player))
                                                     (sin (a player)))))
                              cached-rays #f)
                    ret)
                   ((s) (set! (p player) = (+ (* dt 0.000003 -1
                                                 (v3 (cos (a player))
                                                     (sin (a player)))))
                              cached-rays #f) ret)
                   ;; ((a) (set! (p player) = (+ (* dt 0.000003 -1
                   ;;                               (v3 (sin (a player))
                   ;;                                   (cos (a player)))))) ret)
                   ;; ((d) (set! (p player) = (+ (* dt 0.000003
                   ;;                               (v3 (sin (a player))
                   ;;                                   (cos (a player)))))) ret)
                   ((j) (set! (a player) = (- (* dt 0.000003))
                              cached-rays #f) ret)
                   ((p) (set! (a player) = (+ (* dt 0.000003))
                              cached-rays #f) ret)
                   (else ret)
                   ))
               #f (keys-down))))

    (unless cached-rays
      (set! cached-rays (ray-trace player ray-count)))
    ret)
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  )

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(define (ray-trace player ray-count)
  (let ((x (x (p player)))
        (y (y (p player))))
    (map
     (lambda (a)
       (let loop ((dx 0)
                  (dy 0))
         (let ((nx (+ x dx))
               (ny (+ y dy)))
           (let ((ix (int nx))
                 (iy (int ny)))
             (if (or (not (and (<= 0 nx board-width)
                               (<= 0 ny board-height)))
                     (eq? 'wall (array-ref game-map iy ix)))
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                 (cons
                  (min (- dx (round dx))
                       (- dy (round dy)))
                  (v3 dx dy))
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                 (loop (+ dx (* 0.1 (cos a))) (+ dy (* 0.1 (sin a)))))))))
     (iota ray-count (- (a player) (/ (fov player) 2))
           (/ (fov player) ray-count)))))
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(define fps-time (get-t))
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(define (draw-map)
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  (set-draw-color #xFF #xFF #xFF)
  (clear)

  (set-draw-color 0 0 #xFF)

  (fill-rects
   (filter-map
    (lambda (pt)
      (if (eq? 'wall (array-ref game-map (y pt) (x pt)))
          (make-rect* (x pt) (y pt)
                      1 1)
          #f))
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    (map (lambda (p) (apply v3 p))
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         (cross-product (iota board-width) (iota board-height)))))

  (set-draw-color 0 0 0)

  (for-each (lambda (i) (draw-line
                    0 i
                    board-width i))
            (iota board-height))

  (for-each (lambda (i) (draw-line
                    i 0
                    i board-height))
            (iota board-width))


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  (set-draw-color #xFF 0 0)

  (fill-rect
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   (- (x (p player)) 0.1)
   (- (y (p player)) 0.1)
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   0.2 0.2)

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  (let ((pp (p player)))
   (for-each (lambda (p)
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               (let ((v (+ pp (cdr p))))
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                 (draw-line (x pp) (y pp)
                            (x v)  (y v))))
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             cached-rays
             ))
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  (set-draw-color 0 #xFF 0)

  (draw-line
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   (x (p player)) (y (p player))
   (+ (cos (a player)) (x (p player)))
   (+ (sin (a player)) (y (p player))))
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  ;; (present)
  )
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(define (draw-first-person-perspective)
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  (set-draw-color #xBB #xBB #xFF)
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  (clear)

  (set-draw-color #x33 #x33 #x33)
  (render-fill-rect (current-renderer)
                    (make-rect 0 240 640 240))

  (set-draw-color 0 #xEE #xEE)

  (for-each (lambda (i p)
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              (let ((pos-on-wall (car p))
                    (ray (cdr p)))
                (let* ((l (vector-length ray))
                       (segment-height (- 480 (* 70 l))))
                  (set-draw-color 0
                                  (int (min #xFF (- #x100 (* #x100 (/ l 7)))))
                                  (int (min #xFF (- #x100 (* #x100 (/ l 7))))))
                  (render-fill-rect
                   (current-renderer)
                   (make-rect (int (* i (/ 640 ray-count)))
                              (int (/ (- 480 segment-height) 2))
                              (int (1+ (/ 640 ray-count)))
                              (int segment-height))))))
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            (iota ray-count)
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            cached-rays)
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  )

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(define texture #f)

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(define (draw window rend)
  (parameterize ((current-renderer rend))
    (set-draw-color #xFF #xFF #xFF)
    (clear)

    (let ((texture (make-texture rend 'rgba8888 'target
                                   (* 8 (current-tile-size))
                                   (* 5 (current-tile-size)))))
      (set-render-target! rend texture)
      (set-draw-color #xFF #xFF #xFF)
      (draw-map)
      (set-render-target! rend #f)
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      ;; Camera
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      (draw-first-person-perspective)

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      ;; minimap
      (render-copy rend texture
                   #:dstrect (list 0 0
                                   (* 2 (current-tile-size))
                                   (* 2 (current-tile-size))))
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      (delete-texture! texture))
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    ;; FPS counter
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    (let ((nt (get-t)))
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      (let ((surf (render-font-solid
                   (current-font)
                   (format #f "FPS: ~,2f" (/ 1000000 (- nt fps-time)))
                   (make-color 0 0 0 #xFF))))
        (render-copy (current-renderer)
                     (surface->texture (current-renderer) surf)
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                     #:dstrect (list 1 1
                                     (surface-width surf)
                                     (surface-height surf))))

      (set! fps-time nt))

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    (present)
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    ))
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(define (main-loop window)
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  (define rend (make-renderer window '(accelerated #; vsync texture)))
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  (define last-t (get-t))

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  (let loop ((counter 0))
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    ;; (usleep (int (/ 1000000 (* 60 60))))
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    ;; (sigaction SIGINT (lambda (sig) (set! looping #f)))

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    (if (= counter 1)
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        (begin (draw window rend) (loop 0))
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        (let ((dt (let ((t (get-t)))
                    (let ((dt (- t last-t)))
                      (set! last-t t)
                      dt))))
          (if (update dt)
              'return
              (begin
                (usleep (int (/ (- 1000000 dt) 100)))
                (loop (1+ counter))))))))
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(sdl-init)
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(ttf-init)

(current-font (load-font "/usr/share/fonts/OTF/FiraMono-Regular.otf" 12))

(format #t "Loaded font ~a~%" (current-font))
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(call-with-window
    (make-window
     #:title "Wolf 3D"
     #:size '(640 480))
  main-loop)

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(ttf-quit)
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(sdl-quit)