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https://github.com/bryanthaboi/gen1recomp.git
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bryanthaboi
73 lines
2.3 KiB
Lua
73 lines
2.3 KiB
Lua
-- UI LETTERBOX: what fills the window around a 160x144 screen.
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--
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-- AUTO keeps what each screen was authored with (Gen 1 black, Gen 2 mostly
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-- white, the Pokedex and credits black); the other three override every
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-- screen uniformly. PALETTE takes the active COLORS ramp's paper shade, so
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-- the bars match the panel they frame instead of a fixed grey.
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local Letterbox = {}
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-- Set from applyOptions on both generations, the same shape GbcPalette.setMode
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-- and Tilt.setLevel use, so a draw call needs no options table in hand.
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Letterbox.mode = "auto"
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Letterbox.MODES = { "auto", "black", "white", "palette" }
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local LABELS = {
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auto = "AUTO", black = "BLACK", white = "WHITE", palette = "PALETTE",
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}
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function Letterbox.normalize(mode)
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for _, id in ipairs(Letterbox.MODES) do
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if mode == id then return id end
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end
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return "auto"
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end
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function Letterbox.label(mode)
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return LABELS[Letterbox.normalize(mode)]
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end
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function Letterbox.cycle(mode, dir)
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local at = 1
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for i, id in ipairs(Letterbox.MODES) do
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if id == Letterbox.normalize(mode) then at = i break end
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end
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local n = #Letterbox.MODES
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return Letterbox.MODES[(at - 1 + (dir or 1)) % n + 1]
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end
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-- r, g, b for `mode`, falling back to the screen's authored colour on AUTO.
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--
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-- `paper` is supplied by the caller, not looked up here: the two generations
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-- keep their picked palette in different modules (Gen 1 in PaletteFX, Gen 2 in
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-- GbcPalette) and GbcPalette.available() is true on both, so anything that
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-- sniffed for it answered with Gen 2's white default on a Gen 1 game.
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function Letterbox.color(mode, r, g, b, paper)
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mode = Letterbox.normalize(mode)
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if mode == "black" then return 0, 0, 0 end
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if mode == "white" then return 1, 1, 1 end
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if mode == "palette" and paper then
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local pr, pg, pb = paper()
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if pr then return pr, pg, pb end
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end
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return r or 0, g or 0, b or 0
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end
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function Letterbox.setMode(mode)
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Letterbox.mode = Letterbox.normalize(mode)
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return Letterbox.mode
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end
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function Letterbox.applyOptions(options)
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return Letterbox.setMode(options and options.uiLetterbox)
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end
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-- What a drawWidescreen should paint the window with, given the colour that
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-- screen was authored to use and its generation's paper reader.
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function Letterbox.fill(r, g, b, paper)
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return Letterbox.color(Letterbox.mode, r, g, b, paper)
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end
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return Letterbox
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