honeylisp/game/tiles.fnl

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(local util (require :lib.util))
(local lume (require :lib.lume))
(local files (require :game.files))
(local flags [:walkable])
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(local flag-to-bit {})
(each [iflag flag (ipairs flags)]
(tset flag-to-bit flag (bit.lshift 1 (- iflag 1))))
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(fn appendgfx [org gfx ?key ?label-prefix]
(each [_ g (ipairs gfx)]
(when g.label (org:append (.. (or ?label-prefix "") g.label)))
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(org:append [:bytes (. g (or ?key :gfx))])))
(fn appendtiles [org]
(local tiles files.game.tiles)
(org:append [:align 0x100] :tileset)
(appendgfx org tiles)
(appendgfx org files.game.portraits nil :portrait-)
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(org:append :tileflags)
(each [_ tile (ipairs tiles)]
(var flags 0)
(each [flag _ (pairs tile.flags)]
(set flags (bit.bor flags (. flag-to-bit flag))))
(org:append [:db flags])))
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(fn append-portraitwords [vm ?overrides]
(local overrides (or ?overrides {}))
(each [_ p (ipairs files.game.portraits)]
(let [wordname (.. :draw-portrait- p.label)
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override (. overrides p.label)]
(vm:word wordname :show-footer
(if override (override p.label) [:vm :lit (.. :portrait- p.label)])
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:draw-portrait))))
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(fn encode-yx [xy]
(if xy (bit.bor (bit.lshift (- xy.y 1) 8) (- xy.x 1)) 0xffff))
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(fn encode-itile [itile]
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(bit.bor
(bit.lshift (bit.band (- itile 1) 0x07) 5)
(bit.rshift (bit.band (- itile 1) 0xf8) 3)))
(fn decode-itile [enctile]
(+ 1 (bit.bor
(bit.lshift (bit.band enctile 0x1f) 3)
(bit.rshift (bit.band enctile 0xe0) 5))))
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(fn find-itile [tiles label ?itilenext]
(local itile (or ?itilenext 1))
(local tile (. tiles itile))
(assert (not= tile nil) (.. "No such tile " label))
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(if (= tile.label label) (encode-itile itile)
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(find-itile tiles label (+ itile 1))))
{: appendtiles : appendgfx : append-portraitwords : flags : flag-to-bit : find-itile
: encode-yx : encode-itile : decode-itile}
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