112 lines
3.7 KiB
Fennel
112 lines
3.7 KiB
Fennel
(local util (require :lib.util))
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(local tiles (util.require :game.tiles))
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(local {: vm : org : itile : say : say-runon : controlstate} (require :bitsy.defs))
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(local {: lo : hi} util)
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; Entity memory layout:
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; +0 - yx
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; +2 - event handler
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; +4 - link word
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; +6 - link pointer
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; All entities exist in a single page in RAM - with this structure we can have up to 32
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; (players are handled specially and never require a link)
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; The entity count for a level is stored after the map.
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(local ev {
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:touch 0
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:noop -1
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})
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(vm:def :lookup-entity ; i -- entity
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[:lda vm.TOP :x]
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[:asl :a] [:asl :a] [:asl :a] ; x8
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[:sta vm.TOP :x]
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[:lda :map-page] [:clc] [:adc 1]
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[:sta vm.TOPH :x])
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(vm:word :entity-at ; yx -- entity|0
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:>r 0 :entity-count
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(vm:while [:dup] :dec ; entity|0 i
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:dup :lookup-entity :get :rtop :=
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(vm:when :lookup-entity :swap)
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) :drop :rdrop)
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(vm:var :responder 0)
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(vm:word :get-responder :responder :get)
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(vm:word :entity-itile :get :itile-at)
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(vm:word :responder-itile :get-responder :entity-itile)
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(vm:word :entity>do ; entity ev --
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:over :responder :dup :get :>r :set
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:swap 2 :+ :get :execute
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:r> :responder :set)
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(vm:word :link-arg ; e -- a
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6 :+ :get)
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(vm:word :linked-entity :get-responder :dup 4 :+ :get :dup (vm:if [:execute] [:drop :link-arg]))
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(vm:word :entity-at>do ; yx ev -- f
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:>r :entity-at :dup (vm:if [:r> :entity>do vm.true] [:rdrop]))
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(vm:word :touch-entity ; yx -- f
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ev.touch :entity-at>do)
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(vm:word :untouch-entity ; yx --
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ev.untouch :entity-at>do :drop)
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(vm:word :entity-around>do ; yx ev --
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:over 0x0100 :yx+ :over :entity-at>do :drop
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:over 0x0001 :yx+ :over :entity-at>do :drop
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:over 0xff00 :yx+ :over :entity-at>do :drop
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:swap 0x00ff :yx+ :swap :entity-at>do :drop)
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(vm:word :set-entitytile ; e itile --
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:swap :get :swap :update-itile)
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(vm:word :set-respondertile ; itile --
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:get-responder :get :swap :update-itile)
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; run only when processing an ev.touch event
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(vm:word :transparent-entity-move ; -- f
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:get-responder :get :dup :handle-general-move
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:swap :over :not (vm:if [:move-player-to] [:drop]))
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(vm:var :pre-handled-tile 0)
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(vm:var :pre-handled-ev 0)
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(vm:word :handle-onoff ; ev off on --
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:responder-itile :pre-handled-tile :set :<rot
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:dup ev.tog := (vm:when
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:drop :dup :responder-itile := (vm:if [ev.deact] [ev.act])
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) :dup :pre-handled-ev :set (vm:case
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[ev.act :swap :drop :set-respondertile]
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[ev.deact :drop :set-respondertile]
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[:else :drop :drop]))
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(vm:word :on-handled ; xp-on xp-off --
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:responder-itile :pre-handled-tile :get := (vm:if
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[:drop :drop]
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[:pre-handled-ev :get ev.act :=
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(vm:if [:drop] [:swap :drop]) :execute]))
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(vm:word :activation-ev? ; ev -- f
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:dup ev.act := :over ev.deact := :| :swap ev.tog := :|)
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(vm:word :activate-link ; ev itile-on --
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:swap :activation-ev? (vm:if [
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:responder-itile := (vm:if [ev.act] [ev.deact])
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:linked-entity :swap :entity>do
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] [:drop]))
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(vm:word :move-to-responder :get-responder :get :move-player-to)
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(vm:word :disappear :get-responder 0 :set-entitytile 0xffff :get-responder :set)
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(fn append-from-map [map entity-org prefix]
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(entity-org:append [:align 0x100])
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(each [ientity entity (ipairs map.objects)]
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(when entity.name
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(entity-org:append entity.name))
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(entity-org:append
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(.. prefix "-entity-" ientity)
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[:db (- entity.x 1)] [:db (- entity.y 1)]
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[:ref (if entity.advanced entity.func (.. prefix "-entity-word-" ientity))]
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(if (and entity.advanced entity.linkword (> (length entity.linkword) 0)) [:ref entity.linkword] [:dw 0])
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(if entity.link [:ref (.. prefix "-entity-" entity.link)]
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(and entity.advanced entity.linkentity) [:ref entity.linkentity]
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[:dw 0]))))
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{: ev : append-from-map}
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