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(import scheme
(chicken base)
(chicken process-context)
(only srfi-197 chain)
(prefix sdl2 "sdl2:")
(prefix sdl2-ttf "ttf:")
(prefix sdl2-image "img:")
downstroke-engine
downstroke-world
downstroke-tilemap
downstroke-renderer
downstroke-input
downstroke-physics
downstroke-assets
downstroke-entity
downstroke-sound
downstroke-scene-loader)
(define +debug?+ (and (member "--debug" (command-line-arguments)) #t))
(define (make-player)
(list #:type 'player
#:x 100 #:y 50
#:width 16 #:height 16
#:vx 0 #:vy 0
#:gravity? #t #:on-ground? #f
#:tile-id 1 #:tags '(player)))
(define (player-vx input)
(cond ((input-held? input 'left) -3)
((input-held? input 'right) 3)
(else 0)))
(define (update-player player input tm)
(let ((jump? (input-pressed? input 'a)))
(when (and jump? (entity-ref player #:on-ground? #f))
(play-sound 'jump))
(chain (entity-set player #:vx (player-vx input))
(apply-jump _ jump?)
(apply-acceleration _)
(apply-gravity _)
(apply-velocity-x _)
(resolve-tile-collisions-x _ tm)
(apply-velocity-y _)
(resolve-tile-collisions-y _ tm)
(detect-on-solid _ tm))))
(define *game*
(make-game
title: "Demo: Platformer" width: 600 height: 400
debug?: +debug?+
preload: (lambda (game)
(init-audio!)
(load-sounds! '((jump . "demo/assets/jump.wav"))))
create: (lambda (game)
(game-scene-set! game
(chain (game-load-scene! game "demo/assets/level-0.tmx")
(scene-add-entity _ (make-player))
(update-scene _ camera-target: 'player))))
update: (lambda (game dt)
(let* ((input (game-input game))
(scene (game-scene game))
(tm (scene-tilemap scene))
(player (update-player (car (scene-entities scene)) input tm)))
(game-scene-set! game
(update-scene scene entities: (list player)))))))
(game-run! *game*)
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