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Codex Agent
42 lines
1.2 KiB
Lua
42 lines
1.2 KiB
Lua
-- Optional native-host display lifecycle.
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--
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-- The engine always owns simulation and drawing. A packaged host may install
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-- one backend to observe per-frame updates and prepare/finalize a render target
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-- around an otherwise unchanged draw. With no backend installed every method
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-- is a no-op, which is the normal desktop and mobile path.
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--
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-- Backend methods are optional:
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-- backend:update(dt)
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-- backend:beginFrame(kind, subject)
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-- backend:endFrame(kind, subject)
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--
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-- `kind` is "editor", "touch_editor", "launcher", or "game". `subject` is
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-- the object whose existing draw method runs between beginFrame and endFrame.
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local HostDisplay = {}
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local backend
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function HostDisplay.setBackend(value)
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if value ~= nil and type(value) ~= "table" then
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error("host display backend must be a table or nil", 2)
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end
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backend = value
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end
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function HostDisplay.update(dt)
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local fn = backend and backend.update
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if fn then return fn(backend, dt) end
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end
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function HostDisplay.beginFrame(kind, subject)
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local fn = backend and backend.beginFrame
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if fn then return fn(backend, kind, subject) end
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end
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function HostDisplay.endFrame(kind, subject)
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local fn = backend and backend.endFrame
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if fn then return fn(backend, kind, subject) end
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end
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return HostDisplay
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