mirror of
https://git.k-space.ee/arti/vt1200.git
synced 2026-10-30 12:03:54 +02:00
57 lines
2.2 KiB
Lua
57 lines
2.2 KiB
Lua
-- msg_snap.lua -- read-only frame side channel + on-demand screen snapshots.
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--
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-- No breakpoints and no firmware memory writes: this only reads the frame
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-- counter and takes MAME screenshots when the host creates the trigger file.
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--
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-- MSG_TRIGGER=<path> file the host writes; content: "<prefix> <count> <stride>"
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-- MSG_DIR=<dir> where PNGs go
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--
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-- The host writes "<prefix> 1 0" for one immediate frame, or e.g.
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-- "<prefix> 8 5" for eight snapshots five frames apart. The file is removed
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-- when consumed. Snapshots render through the emulated palette.
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local machine = manager.machine
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local dir = os.getenv("MSG_DIR") or "."
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local trigger = os.getenv("MSG_TRIGGER") or (dir .. "/trigger")
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local screen = nil
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for _, s in pairs(machine.screens) do screen = s; break end
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local frame = 0
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local job = nil
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local function consume_trigger()
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local fh = io.open(trigger, "r")
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if not fh then return end
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local text = fh:read("*a") or ""
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fh:close()
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os.remove(trigger)
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local prefix, count, stride = text:match("(%S+)%s+(%d+)%s+(%d+)")
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if not prefix then
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print("msg_snap: bad trigger " .. text)
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return
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end
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job = { prefix = prefix, left = tonumber(count), stride = tonumber(stride), next = frame }
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print(string.format("msg_snap: frame %d job %s x%d every %d", frame,
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prefix, job.left, job.stride))
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end
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emu.register_frame_done(function()
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frame = frame + 1
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consume_trigger()
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if job and frame >= job.next and screen then
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local out = string.format("%s/%s_frame%05d.png", dir, job.prefix, frame)
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local ok, err = pcall(function() return screen:snapshot(out) end)
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print(string.format("msg_snap: frame %d %s ok=%s err=%s", frame,
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out, tostring(ok), tostring(err)))
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job.left = job.left - 1
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job.next = frame + job.stride
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if job.left <= 0 then job = nil end
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end
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if frame % 500 == 0 then
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local cpu = machine.devices[':maincpu']
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print(string.format("msg_snap: frame %d PC=%08X", frame,
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cpu.state['PC'].value))
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end
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end, "vt1200-msg-snap")
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if machine.debugger then machine.debugger.execution_state = 'run' end
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