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(import scheme
(chicken base)
(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)
(define *game*
(make-game
title: "Demo: Platformer" width: 600 height: 400
preload: (lambda (game)
(init-audio!)
(load-sounds! '((jump . "demo/assets/jump.wav")))
(game-asset-set! game 'tilemap
(load-tilemap "demo/assets/level-0.tmx")))
create: (lambda (game)
(let* ((tm (game-asset game 'tilemap))
(tex (sdl2:create-texture-from-surface
(game-renderer game)
(tileset-image (tilemap-tileset tm))))
(player (list #:type 'player
#:x 100 #:y 50
#:width 16 #:height 16
#:vx 0 #:vy 0
#:gravity? #t
#:on-ground? #f
#:tile-id 1)))
(game-scene-set! game
(make-scene
entities: (list player)
tilemap: tm
camera: (make-camera x: 0 y: 0)
tileset-texture: tex))))
update: (lambda (game dt)
(let* ((input (game-input game))
(scene (game-scene game))
(tm (scene-tilemap scene))
(player (car (scene-entities scene)))
(player (entity-set player #:vx
(cond
((input-held? input 'left) -3)
((input-held? input 'right) 3)
(else 0))))
(_ (when (and (input-pressed? input 'a)
(entity-ref player #:on-ground? #f))
(play-sound 'jump)))
(player (apply-jump player (input-pressed? input 'a)))
(player (apply-acceleration player))
(player (apply-gravity player))
(player (apply-velocity-x player))
(player (resolve-tile-collisions-x player tm))
(player (apply-velocity-y player))
(player (resolve-tile-collisions-y player tm))
(player (detect-ground player tm)))
(let ((cam-x (max 0 (- (entity-ref player #:x 0) 300))))
(camera-x-set! (scene-camera scene) cam-x))
(scene-entities-set! scene (list player))))))
(game-run! *game*)
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