80 lines
2.1 KiB
Fennel
80 lines
2.1 KiB
Fennel
(local tile (require :game.tiles))
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(local {: vm : mapw : maph : itile : controlstate} (require :game.defs))
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(local {: walkable} tile.flag-to-bit)
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(vm:word :movement-dir ; key -- dyx
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(vm:case [(string.byte "I") 0xff00]
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[(string.byte "J") 0x00ff]
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[(string.byte "K") 0x0001]
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[(string.byte "M") 0x0100]
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[:else 0x0000]))
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(vm:def :yx+ ; yx yx -- yx
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[:lda vm.TOP :x]
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[:clc] [:adc vm.ST1 :x]
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[:sta vm.ST1 :x]
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[:lda vm.TOPH :x]
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[:clc] [:adc vm.ST1H :x]
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[:sta vm.ST1H :x]
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(vm:drop))
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(vm:var :player-yx 0x0a0a)
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(vm:word :draw-player ; --
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:player-yx :dup (vm:if [:get :dup 0xffff := (vm:if [:drop] [:yx>screen :player-tile :drawtile])] [:drop]))
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(vm:var :noclip)
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(vm:word :move-if-clear ; yx -- f
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:noclip :get (vm:if [:drop vm.false] [:movable-player-flag :flag-at? :not]))
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(vm:const :movable-player-flag ; -- flag
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walkable)
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(vm:word :move-player-to ; yx --
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:player-yx :dup :get :dup 0xffff := (vm:if [:drop] [:drawtile-at])
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:set :draw-player)
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(vm:word :move-noop :drop vm.false)
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(vm:word :handle-general-move ; yx -- f
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(vm:if-or [[:dup :map-specific-move] [:dup :move-if-clear]]
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[:drop vm.true] [:move-noop]))
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(vm:def :yxclip? ; yx -- f
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[:block
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[:lda vm.TOP :x]
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[:cmp mapw]
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[:bcs :clipped]
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[:lda vm.TOPH :x]
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[:cmp maph]
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[:bcs :clipped]
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[:lda 0] [:sta vm.TOP :x] [:sta vm.TOPH :x] (vm:ret)
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:clipped
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[:lda 0xff] [:sta vm.TOP :x] [:sta vm.TOPH :x]])
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(vm:word :try-move-player ; dir --
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:player-yx :get :yx+ ; yxnew
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(vm:if-or [[:dup :yxclip?] [:dup :touch-entity] [:dup :handle-general-move]]
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[:drop :player-yx :get])
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; always "move" so that player can visibly change direction
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; touch-entity can modify player-yx so we have to refetch
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:move-player-to)
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(vm:word :two-frame :tick-count :get 0x1f :& 0x10 :<)
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(vm:word :player-tile ; -- ptile
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(itile :player-frame1) :lookup-tile)
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(vm:word :flag-at? ; yx flag -- f
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:swap :itile-at :lookup-flags :&)
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(vm:word :player-key ; key --
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(vm:ifchain
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[:movement-dir :dup]
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[:try-move-player :load-next-level]
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[:drop]))
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(vm:word :full-redraw :drawmap :player-redraw)
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(vm:word :player-redraw :draw-player)
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