80 lines
2.5 KiB
Lua
80 lines
2.5 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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function DonBGAnim.new(index, player_num, path)
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local name = 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 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 = string.format("donbga_%02d_%dp", index, player_num)
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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 function ch(v, i)
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if type(v) == "number" then return v end
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return v[i]
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end
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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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tex.draw_texture(id, {
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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 = { 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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})
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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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