mirror of
https://github.com/bryanthaboi/gen1recomp.git
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bryanthaboi
52 lines
1.9 KiB
Lua
52 lines
1.9 KiB
Lua
-- ROM extraction, off the main thread. The extractor's require closure needs
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-- only love.filesystem, love.image, love.math and love.system, none of which
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-- are main-thread-only, so it runs here instead of as a coroutine the frame
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-- loop resumed for 8ms out of every 16.7ms.
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--
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-- The caller clears the stale cache and writes the completion marker itself;
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-- this only fills the tree between those two steps, so the "marker appears
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-- last" order isReady() depends on stays on one thread.
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require("love.filesystem")
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require("love.image")
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require("love.math")
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require("love.system")
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require("love.timer")
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local version, prefix, romData, progressName, resultName, romSha1 = ...
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local progressChannel = love.thread.getChannel(progressName)
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local resultChannel = love.thread.getChannel(resultName)
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-- RomExtractor:tick fires per item, thousands of times per import; a channel
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-- push each would cost more than the work it reports.
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local PROGRESS_HZ = 20
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local ok, err = pcall(function()
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local CacheFs = require("src.import.CacheFs")
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CacheFs.prefix = prefix
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local manifest = require("src.import.RomManifest").decode(version)
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local RomExtractor =
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require("src.core.GameVersion").generation(version) == 2
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and require("src.import.RomExtractorGen2")
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or require("src.import.RomExtractor")
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local lastPush, lastStage = 0, nil
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local extractor = RomExtractor.new(romData, manifest,
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function(progress, total, stage, current, stageTotal)
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local now = love.timer.getTime()
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-- Stage changes always go through, or the caption goes stale.
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if stage ~= lastStage or now - lastPush >= 1 / PROGRESS_HZ then
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lastPush, lastStage = now, stage
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progressChannel:push({
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progress = progress, total = total, stage = stage,
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current = current, stageTotal = stageTotal,
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})
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end
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end, romSha1)
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extractor:run()
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end)
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resultChannel:push({ ok = ok, error = ok and nil or tostring(err) })
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