248 lines
9.6 KiB
Fennel
248 lines
9.6 KiB
Fennel
(local state (require :state))
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(local mapper (require :mapper))
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(local overlay (require :overlay))
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(local pi math.pi)
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(var count-down true)
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; ### Screen Size ###
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(var (screen-width screen-height) (love.window.getMode))
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(love.mouse.setGrabbed true)
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(love.mouse.setRelativeMode true)
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; ### Map Information ###
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(var (map spawn) (mapper.generate))
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; ### Texture Information ###
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(var walls [])
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(var wall-textures (love.filesystem.getDirectoryItems "assets/textures/walls"))
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(var (tex-height tex-width) (values 64 64))
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(var skybox [])
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(var skybox-textures (love.filesystem.getDirectoryItems "assets/textures/skybox"))
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(each [_ v (ipairs wall-textures)]
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(local wall {})
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(tset wall :t (love.graphics.newImage (.. "assets/textures/walls/" v)))
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(tset wall :w (love.graphics.getWidth (. wall :t)))
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(tset wall :h (love.graphics.getHeight (. wall :t)))
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(table.insert walls wall))
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(each [_ v (ipairs skybox-textures)]
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(local skyb {})
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(tset skyb :t (love.graphics.newImage (.. "assets/textures/skybox/" v)))
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(tset skyb :w (love.graphics.getWidth (. skyb :t)))
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(tset skyb :h (love.graphics.getHeight (. skyb :t)))
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(table.insert skybox skyb))
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; ### "Player" variables ###
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(var (posx posy) (values (+ (. spawn :x) 0.5) (+ (. spawn :y) 0.5)))
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(var (dirx diry) (values -1.0 0.0)) ; Initial direction vector
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(var (planex planey) (values 0 0.66)) ; Camera plane
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; ### Offset experimentation ###
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(var (offst-x offst-y) (values 0 0))
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{
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:draw (fn love.draw []
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(state.setDirX dirx)
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(state.setDirY diry)
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; Mouse-Look
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(love.graphics.translate offst-x offst-y)
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; "Skybox"
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; Draw a big thing before everything else
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; (love.graphics.draw (. skybox 1 :t) -20 -20)
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; WALL CASTING
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(for [i 0 screen-width]
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; Calculate ray position and direction
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; Originals, giving a fish-eye lens effect:
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; (var camerax (/ (* 2 i) (- screen-width 1)))
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; (var (ray-dir-x ray-dir-y) (values (+ dirx (* planex camerax)) (+ diry (* planey camerax))))
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(var camerax (- (/ (* 2 i) (- screen-width 1)) 1.0))
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(var (ray-dir-x ray-dir-y) (values (+ dirx (* planex camerax)) (+ diry (* planey camerax))))
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; Which map square we're in
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(var (mapx mapy) (values (math.floor posx) (math.floor posy)))
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; Length of ray from current position to next x or y side
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(var (side-dist-x side-dist-y) (values 0 0))
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; Length of ray from one x or y side to the next x or y side
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; (var (delta-dist-x delta-dist-y) (values
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; (math.sqrt (+ 1 (/ (* ray-dir-y ray-dir-y) (* ray-dir-x ray-dir-x))))
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; (math.sqrt (+ 1 (/ (* ray-dir-x ray-dir-x) (* ray-dir-y ray-dir-y))))))
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; (var (delta-dist-x delta-dist-y) (values
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; (math.sqrt (+ 1 (* (/ ray-dir-y ray-dir-x) (/ ray-dir-y ray-dir-x))))
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; (math.sqrt (+ 1 (* (/ ray-dir-x ray-dir-y) (/ ray-dir-x ray-dir-y))))))
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(var (delta-dist-x delta-dist-y) (values (math.abs (/ 1 ray-dir-x)) (math.abs (/ 1 ray-dir-y))))
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(var perp-wall-dist 0)
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; Direction to step in, x or y
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(var (stepx stepy) (values 0 0))
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; Side the ray hits, x (0) or y (1)
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(var side 0)
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; Calculate step and initial side-dist-*
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(if (< ray-dir-x 0)
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(do
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(set stepx -1)
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(set side-dist-x (* (- posx mapx) delta-dist-x)))
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(do
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(set stepx 1)
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(set side-dist-x (* (- (+ mapx 1.0) posx) delta-dist-x))))
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(if (< ray-dir-y 0)
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(do
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(set stepy -1)
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(set side-dist-y (* (- posy mapy) delta-dist-y)))
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(do
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(set stepy 1)
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(set side-dist-y (* (- (+ mapy 1.0) posy) delta-dist-y))))
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; Perform DDA (Digital Differential Analysis)
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(var hit false)
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(while (not hit)
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(if (< side-dist-x side-dist-y)
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(do
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(set side-dist-x (+ side-dist-x delta-dist-x))
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(set mapx (+ mapx stepx))
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(set side 0))
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(do
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(set side-dist-y (+ side-dist-y delta-dist-y))
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(set mapy (+ mapy stepy))
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(set side 1)))
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(if (> (. map mapx mapy) 0) (set hit true)))
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; Calculate distance of perpendicular ray, to avoid fisheye effect
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(if (= side 0)
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(set perp-wall-dist (- side-dist-x delta-dist-x))
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(set perp-wall-dist (- side-dist-y delta-dist-y)))
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; Calculate height of line to draw on screen
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(var line-height (/ screen-height perp-wall-dist))
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; Calculate lowest and highest pixel to fill in current stripe
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(var draw-start (+ (/ (- line-height) 2) (/ screen-height 2)))
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(if (< draw-start 0) (set draw-start 0))
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(var draw-end (+ (/ line-height 2) (/ screen-height 2)))
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(if (>= draw-end screen-height) (set draw-end (- screen-height 1)))
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; Draw textured wall
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;; Choose texture
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; (var tex-num (. walls (. map mapx mapy)))
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(var tex-num (. walls (math.floor (/ (. map mapx mapy) 10))))
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;; Calculate exactly where the wall was hit
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(var wallx 0)
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(if (= side 0)
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(set wallx (+ posy (* perp-wall-dist ray-dir-y)))
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(set wallx (+ posx (* perp-wall-dist ray-dir-x))))
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(set wallx (- wallx (math.floor wallx)))
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;; Find the x-coordinate on the texture
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(var tex-x (math.floor (* wallx (. tex-num :w))))
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(if (and (= side 0) (> ray-dir-x 0)) (set tex-x (- (. tex-num :w) tex-x 1)))
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(if (and (= side 1) (< ray-dir-y 0)) (set tex-x (- (. tex-num :w) tex-x 1)))
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;; Draw the texture, accounting for "fog"
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(var fog-dist (- 1 (/ perp-wall-dist 10)))
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(var light-dist (- 0.8 (/ perp-wall-dist 5)))
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(love.graphics.setColor light-dist light-dist light-dist fog-dist)
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; (love.graphics.draw (. tex-num :t)
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; (love.graphics.newQuad tex-x 0 1 (. tex-num :h) (. tex-num :w) (. tex-num :h))
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; i draw-start 0 1 (/ line-height (. tex-num :h)))
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; (when (= (. map mapx mapy) 3)
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(for [q 0 (% (. map mapx mapy) 10)]
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(set fog-dist (- fog-dist 0.1))
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(set light-dist (- light-dist 0.1))
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(love.graphics.setColor light-dist light-dist light-dist fog-dist)
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(love.graphics.draw (. tex-num :t)
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(love.graphics.newQuad tex-x 0 1 (. tex-num :h) (. tex-num :w) (. tex-num :h))
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i (- draw-start (* line-height q)) 0 1 (/ line-height (. tex-num :h)))
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)
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; )
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)
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(overlay.overlay offst-x offst-y)
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)
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:update (fn update [dt]
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(var mvspeed (* dt 3.0))
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(var rtspeed (* dt 1.0))
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(when (love.keyboard.isDown "w")
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(when (= 0 (. map (math.floor (+ (* mvspeed dirx) posx)) (math.floor posy)))
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(set posx (+ (* mvspeed dirx) posx))
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(state.modDis mvspeed))
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(when (= 0 (. map (math.floor posx) (math.floor (+ (* mvspeed diry) posy))))
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(set posy (+ (* mvspeed diry) posy))
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(state.modDis mvspeed))
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)
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(when (love.keyboard.isDown "s")
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(when (= 0 (. map (math.floor (- posx (* mvspeed dirx))) (math.floor posy)))
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(set posx (- posx (* mvspeed dirx)))
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(state.modDis mvspeed))
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(when (= 0 (. map (math.floor posx) (math.floor (- posy (* mvspeed diry)))))
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(set posy (- posy (* mvspeed diry)))
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(state.modDis mvspeed))
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)
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(when (love.keyboard.isDown "d")
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(when (= 0 (. map (math.floor (+ (* mvspeed planex) posx)) (math.floor posy)))
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(set posx (+ (* mvspeed planex) posx))
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(state.modDis mvspeed))
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(when (= 0 (. map (math.floor posx) (math.floor (+ (* mvspeed planey) posy))))
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(set posy (+ (* mvspeed planey) posy))
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(state.modDis mvspeed))
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)
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(when (love.keyboard.isDown "a")
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(when (= 0 (. map (math.floor (- posx (* mvspeed planex))) (math.floor posy)))
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(set posx (- posx (* mvspeed planex)))
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(state.modDis mvspeed))
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(when (= 0 (. map (math.floor posx) (math.floor (- posy (* mvspeed planey)))))
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(set posy (- posy (* mvspeed planey)))
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(state.modDis mvspeed))
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)
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(when (love.keyboard.isDown "e")
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(var old-dirx dirx)
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(set dirx (- (* dirx (math.cos (- rtspeed))) (* diry (math.sin (- rtspeed)))))
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(set diry (+ (* old-dirx (math.sin (- rtspeed))) (* diry (math.cos (- rtspeed)))))
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(var old-planex planex)
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(set planex (- (* planex (math.cos (- rtspeed))) (* planey (math.sin (- rtspeed)))))
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(set planey (+ (* old-planex (math.sin (- rtspeed))) (* planey (math.cos (- rtspeed)))))
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)
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(when (love.keyboard.isDown "q")
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(var old-dirx dirx)
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(set dirx (- (* dirx (math.cos rtspeed)) (* diry (math.sin rtspeed))))
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(set diry (+ (* old-dirx (math.sin rtspeed)) (* diry (math.cos rtspeed))))
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(var old-planex planex)
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(set planex (- (* planex (math.cos rtspeed)) (* planey (math.sin rtspeed))))
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(set planey (+ (* old-planex (math.sin rtspeed)) (* planey (math.cos rtspeed))))
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)
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(if (= 0 (% (+ 1 (math.floor (state.getDis))) 10))
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(when count-down
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(set count-down false)
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(state.modO -1))
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(set count-down true))
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)
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:mousemoved (fn mousemoved [x y dx dy]
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(var rtspeed (* dx -0.001))
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(var yawspeed (* dy -0.5))
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(var old-dirx dirx)
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(set dirx (- (* dirx (math.cos rtspeed)) (* diry (math.sin rtspeed))))
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(set diry (+ (* old-dirx (math.sin rtspeed)) (* diry (math.cos rtspeed))))
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(var old-planex planex)
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(set planex (- (* planex (math.cos rtspeed)) (* planey (math.sin rtspeed))))
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(set planey (+ (* old-planex (math.sin rtspeed)) (* planey (math.cos rtspeed))))
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(set offst-y (+ offst-y yawspeed))
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)
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:keypressed (fn keypressed [k]
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(when (= k "x") (love.event.quit))
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)
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}
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