101 lines
3.4 KiB
Fennel
101 lines
3.4 KiB
Fennel
(fn pal-from-bit [bit]
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(if bit
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(values [20 207 253] [255 106 60])
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(values [255 68 253] [20 245 60])))
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(fn pal-from-byte [byte]
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(pal-from-bit (not= 0 (bit.band byte 0x80))))
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(fn putpixel [x y color]
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(when color
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(love.graphics.setColor (/ (. color 1) 255) (/ (. color 2) 255) (/ (. color 3) 255))
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(love.graphics.points (+ x 0.5) (+ y 0.5))))
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(fn make-canvas [w h f]
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(local canvas (love.graphics.newCanvas w h))
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(canvas:setFilter :nearest :nearest)
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(local scissor [(love.graphics.getScissor)])
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(love.graphics.setScissor)
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(love.graphics.setCanvas canvas)
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(love.graphics.clear 0 0 0)
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(f canvas)
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(love.graphics.setCanvas)
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(love.graphics.setScissor (table.unpack scissor))
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(love.graphics.setColor 1 1 1 1)
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canvas)
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(fn tile-to-sprite [tile]
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(make-canvas 14 16 (fn [canvas]
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(for [y 0 15]
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(local byte1 (string.byte (tile:sub (+ y 1) (+ y 1))))
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(local byte2 (string.byte (tile:sub (+ y 17) (+ y 17))))
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(local pal1 [(pal-from-byte byte1)])
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(local pal2 [(pal-from-byte byte2)])
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(var prevstate :off)
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(var state :off)
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(for [x 0 13]
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(local byte (if (< x 7) byte1 byte2))
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(local bitx (if (< x 7) x (- x 7)))
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(local bit (not= 0 (bit.band byte (bit.lshift 1 bitx))))
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(local prevpal (if (< x 8) pal1 pal2))
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(local pal (if (< x 7) pal1 pal2))
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(local prevart (. prevpal (+ 1 (% x 2))))
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(local art (. pal (+ 1 (% x 2))))
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(set prevstate state)
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(set state
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(match [prevstate bit]
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[:off false] :off
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[:off true] :rising
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[:rising false] :falling
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[:rising true] :on
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[:falling false] :off
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[:falling true] :rising
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[:on true] :on
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[:on false] :falling))
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(local white [255 255 255])
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(local (prevcolor color)
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(match [prevstate state]
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[_ :on] (values white white)
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[:off :rising] (values nil art)
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[:falling :rising] (values prevart art)))
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(putpixel (- x 1) y prevcolor)
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(putpixel x y color))))))
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(fn portrait-to-sprite [gfx]
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(print "generating portrait")
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(local tl (tile-to-sprite (gfx:sub 1 32)))
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(local bl (tile-to-sprite (gfx:sub 33 64)))
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(local tr (tile-to-sprite (gfx:sub 65 96)))
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(local br (tile-to-sprite (gfx:sub 97 128)))
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(make-canvas 28 32 (fn [canvas]
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(love.graphics.draw tl 0 0)
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(love.graphics.draw bl 0 16)
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(love.graphics.draw tr 14 0)
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(love.graphics.draw br 14 16))))
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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 []
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:tile (fn [self itile] (or (. self.tiles itile) {:flags {}}))
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:update-tile
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(fn [self itile tile]
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(tset self.tiles itile
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(-> (self:tile itile)
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(doto (tset :gfx tile))))
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(tset self.tilesprites itile nil))
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:set-flag
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(fn [self itile flag clear]
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(tset (. self.tiles itile :flags) flag (if clear nil true)))
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:load
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(fn [self tiles]
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(set self.tiles tiles)
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(set self.tilesprites []))
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:sprite
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(fn [self itile]
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(when (and (= nil (. self.tilesprites itile)) (not= nil (. self.tiles itile)))
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(tset self.tilesprites itile (self.spritegen (. self.tiles itile :gfx))))
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(. self.tilesprites itile))})
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{: tile-to-sprite : portrait-to-sprite : pal-from-bit : pal-from-byte : TileCache}
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