96 lines
3.1 KiB
Fennel
96 lines
3.1 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} (require :game.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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; if we really need more we could have one page for entities and one page for link data
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; hellmaze level 2 from MS-DOS Neut Tower has 36 entities - good excuse to simplify IMO
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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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:act 1
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:deact 2
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:tog 3
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})
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(vm:word :entity-count :lit :map-entity-count :bget)
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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 #(hi org.entity.org)]
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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.code:append :responder [:dw 0])
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(vm:word :get-responder :lit :responder :get)
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(vm:word :responder-itile :get-responder :get :itile-at)
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(vm:word :entity>do ; entity ev --
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:over :lit :responder :dup :get :>r :set
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:swap 2 :+ :get :execute
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:r> :lit :responder :set)
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(vm:word :linked-entity :get-responder :dup 4 :+ :get :dup (vm:if [:dup :. :execute] [:drop 6 :+ :dup :. :get]) :dup :.)
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(vm:word :touch-entity ; yx -- f
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:entity-at :dup (vm:when ev.touch :entity>do vm.true))
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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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(vm:word :handle-onoff ; ev off on --
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:<rot (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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[ev.tog :dup :responder-itile := (vm:if [:drop :set-respondertile] [:set-respondertile :drop])]
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[:else :drop :drop]))
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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 :dup :. := (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 :door ; ev --
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:dup :. :dup (vm:case
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[ev.touch :drop :responder-itile (itile :dooropen) := (vm:when :move-player)]
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[:else (itile :doorclosed) (itile :dooropen) :handle-onoff]))
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(vm:word :switch ; ev --
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:dup ev.touch := (vm:when :drop ev.tog)
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:dup (itile :switchoff) (itile :switchon) :handle-onoff
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(itile :switchon) :activate-link)
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(vm:word :term ; ev --
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:dup ev.touch := (vm:when :drop ev.act)
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:dup (itile :termoff) (itile :termon) :handle-onoff)
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(fn append-from-map [map entity-org]
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(each [_ 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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[:db (- entity.x 1)] [:db (- entity.y 1)]
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[:ref entity.func]
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(if (and entity.linkword (> (length entity.linkword) 0)) [:ref entity.linkword] [:dw 0])
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(if entity.link [:dw (+ entity-org.org (* (- entity.link 1) 8))] [:dw 0]))))
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{: ev : append-from-map}
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