Discussion
It turns out there's more to the SDL initializers then I thought, those were calls to internal wrappers!
Initializing the audio also involves registering a callback (in an Audio Source) to supply audio data from the emulator, as well as a buffer for that callback to read from.
Updating the audio (during the mainloop) emulates the sound system, & synchronously copies the data over where that callback can see it.
And there's a finalizer.
6/7!!
The joystick initializer also show a message box indicating whether it was successful.
The video initializer also configures the output mode, with its update routine invoking the correct routine for the machine we're emulating (and depending on whether we're skipping a frame) before carefully copying the output bitmap over to SDL with fullscreen & emulated lightgun input handled specially. And there's a finalizer.
Nothing more to say for the sync subsystem.
7/7 Fin for today!
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