TaikoZhongandClaude Opus 5.5
2f7291d4ec
The collab backdrops (and the default donbg band) replay exported movies
whose per-frame channels were Lua tables of numbers: 38 MB that Lua
compiled on every song start (0.7 s for the TOHO pack; game screen init
1.5-1.6 s -> 0.9-1.0 s in-game), plus ~19 MB of Lua memory per pack.
Each per-frame array is now {base, step, width, "digits"}: value = base +
step * n, n being the frame's width chars in base 92 (printable ASCII
without '"' and '\'). One string constant compiles in a fraction of the
time; bg_objects/packed_channel.lua decodes the frame being drawn.
Quantization: 0.05 px, 0.005 deg, 5e-5 scale, 1/1024 alpha and tint;
every value of all 77 files checked against the original within half a
step.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
87 lines
3.2 KiB
Lua
87 lines
3.2 KiB
Lua
-- Cabinet-faithful donbg band player.
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-- Data: background/bg_data/donbg_anim/a_NN_Mp.lua; textures: donbga_NN_Mp/s<c>.png.
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local DonBGAnim = {}
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DonBGAnim.__index = DonBGAnim
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local FRAME_MS = 1000.0 / 60.0 -- the band steps at 60 Hz
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local ONE = string.byte("1")
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-- name: a collab band ("b_001_1p": bg_data/donbg_anim/b_001_1p.lua, donbga_b_001_1p/);
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-- nil for the default band picked by index
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function DonBGAnim.new(index, player_num, path, name)
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local subset = name and ("donbga_" .. name) or string.format("donbga_%02d_%dp", index, player_num)
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name = name or string.format("a_%02d_%dp", index, player_num)
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local ok, data = pcall(require, "background/bg_data/donbg_anim/" .. name)
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if not ok or type(data) ~= "table" or not (data.normal or data.top) then return nil end
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local self = setmetatable({}, DonBGAnim)
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self.name = name
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self.path = path
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self.subset = subset
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tex.load_folder(path, self.subset)
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self.data = data
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self.ids = {}
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self.elapsed = 0
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self.last_ms = nil
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return self
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end
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function DonBGAnim:id_of(shape)
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local id = self.ids[shape]
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if id == nil then
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id = tex.get_texture(self.path .. "/" .. self.subset .. "/s" .. shape) or false
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self.ids[shape] = id
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end
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return id or nil
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end
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function DonBGAnim:update(current_ms)
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if self.last_ms then
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local dt = current_ms - self.last_ms
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if dt > 0 and dt < 500 then self.elapsed = self.elapsed + dt end
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end
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self.last_ms = current_ms
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end
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local ch = require("background/bg_objects/packed_channel") -- number, per-frame table or packed string
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-- draw one state with a global fade, the band's top-left at (0, y)
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function DonBGAnim:draw_state(state, fade, y)
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local list = self.data[state]
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if not list or fade <= 0.002 then return end
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local frame = math.floor(self.elapsed / FRAME_MS)
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local shapes = self.data.shapes
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for k = 1, #list do
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local e = list[k]
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local i = (frame % e.period) + 1
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local a = ch(e.a, i)
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if a > 0.002 and e.on then
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if e.on:byte((frame % e.on_period) + 1) ~= ONE then a = 0 end
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end
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if a > 0.002 then
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local s = shapes[e.shape]
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local id = s and self:id_of(e.shape)
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if id then
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local sx, sy = ch(e.sx, i), ch(e.sy, i)
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-- mir: a mirroring placement; the texture flips inside its rect, so the
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-- origin moves to the other side of the png
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local mir = e.mir and ch(e.mir, i) == 1
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-- cr/cg/cb: the placement's colour multiply
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local col = e.cr and { ch(e.cr, i) * 255, ch(e.cg, i) * 255, ch(e.cb, i) * 255, 255 } or nil
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tex.draw_texture(id, {
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color = col,
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x = ch(e.tx, i),
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y = y + ch(e.ty, i),
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x2 = s[1] * (sx - 1),
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y2 = s[2] * (sy - 1),
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origin = { (mir and (s[1] - s[3]) or s[3]) * sx, s[4] * sy },
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rotation = ch(e.rot, i),
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fade = a * fade,
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mirror = mir and "horizontal" or nil,
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})
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end
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end
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end
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end
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return DonBGAnim
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