honeylisp/editor/tiledraw.fnl

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(fn pal-from-bit [bit]
(if bit
(values [20 207 253] [255 106 60])
(values [255 68 253] [20 245 60])))
(fn pal-from-byte [byte]
(pal-from-bit (not= 0 (bit.band byte 0x80))))
(fn putpixel [x y color]
(when color
(love.graphics.setColor (/ (. color 1) 255) (/ (. color 2) 255) (/ (. color 3) 255))
(love.graphics.points (+ x 0.5) (+ y 0.5))))
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(fn make-canvas [w h f]
(local canvas (love.graphics.newCanvas w h))
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(local prevcanvas (love.graphics.getCanvas))
(canvas:setFilter :nearest :nearest)
(local scissor [(love.graphics.getScissor)])
(love.graphics.setScissor)
(love.graphics.setCanvas canvas)
(love.graphics.clear 0 0 0)
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(f canvas)
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(love.graphics.setCanvas prevcanvas)
(love.graphics.setScissor (table.unpack scissor))
(love.graphics.setColor 1 1 1 1)
canvas)
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(fn draw-byte [bytes ibyte xoffset y ?state ?prevpal]
(local byte (string.byte (bytes:sub ibyte ibyte)))
(var prevstate nil)
(var state (or ?state :off))
(var pal [(pal-from-byte byte)])
(var prevpal (or ?prevpal pal))
(for [bitx 0 6]
(local x (+ bitx xoffset))
(local bit (not= 0 (bit.band byte (bit.lshift 1 bitx))))
(local prevart (. prevpal (+ 1 (% x 2))))
(local art (. pal (+ 1 (% x 2))))
(set prevstate state)
(set prevpal pal)
(set state
(match [prevstate bit]
[:off false] :off
[:off true] :rising
[:rising false] :falling
[:rising true] :on
[:falling false] :off
[:falling true] :rising
[:on true] :on
[:on false] :falling))
(local white [255 255 255])
(local (prevcolor color)
(match [prevstate state]
[_ :on] (values white white)
[:off :rising] (values nil art)
[:falling :rising] (values prevart art)))
(putpixel (- x 1) y prevcolor)
(putpixel x y color))
(values state pal))
(fn tilestrip-to-sprite [tiles]
(make-canvas (* 14 (length tiles)) 16 (fn [canvas]
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(for [y 0 15]
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(var state nil)
(var prevpal nil)
(each [itile tile (ipairs tiles)]
(local x (* (- itile 1) 14))
(set (state prevpal) (draw-byte tile (+ y 1) x y state prevpal))
(set (state prevpal) (draw-byte tile (+ y 17) (+ x 7) y state prevpal)))))))
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(fn tile-to-sprite [tile] (if tile (tilestrip-to-sprite [tile]) (make-canvas 14 16 #nil)))
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(fn portrait-to-sprite [gfx]
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(local top (tilestrip-to-sprite [(gfx:sub 1 32) (gfx:sub 65 96)]))
(local bottom (tilestrip-to-sprite [(gfx:sub 33 64) (gfx:sub 97 128)]))
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(make-canvas 28 32 (fn [canvas]
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(love.graphics.draw top 0 0)
(love.graphics.draw bottom 0 16))))
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(fn char-to-sprite [gfx]
(make-canvas 7 8 (fn [canvas]
(for [y 0 7]
(draw-byte gfx (+ y 1) 0 y)))))
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(fn TileCache [tiles ?spritegen]
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{: tiles
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:spritegen (or ?spritegen tile-to-sprite)
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:tilesprites []
:tile (fn [self itile] (or (. self.tiles itile) {:flags {}}))
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:cachekey (fn [itile ?key] (.. (or ?key :gfx) itile))
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:update-tile
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(fn [self itile tile ?key]
(tset self.tiles itile
(-> (self:tile itile)
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(doto (tset (or ?key :gfx) tile))))
(tset self.tilesprites (self.cachekey itile ?key) nil))
:set-flag
(fn [self itile flag clear]
(tset (. self.tiles itile :flags) flag (if clear nil true)))
:load
(fn [self tiles]
(set self.tiles tiles)
(set self.tilesprites []))
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:sprite
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(fn [self itile ?key]
(local key (self.cachekey itile ?key))
(when (and (= nil (. self.tilesprites key)) (not= nil (. self.tiles itile)))
(tset self.tilesprites key (self.spritegen (. self.tiles itile (or ?key :gfx)))))
(. self.tilesprites key))})
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{: tile-to-sprite : tilestrip-to-sprite : portrait-to-sprite : char-to-sprite : pal-from-bit : pal-from-byte : TileCache}
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