* Initial work on improved stubs
Simulates library behaviors for when a camera is not connected.
* Get* functions complete
I ended up leaving some stubs behind, but most of what I didn't do seem to be internal functions called by other libraries we'd be running HLE anyway.
* Finished stubs
Everything I can reasonably confirm the behavior of should behave as expected, emulating the behavior of a PS4 with no camera attached.
* sceCameraStart firmware check
This check only applies to higher eboot firmwares, since my previous test eboots used firmware 1.00 I completely missed this.
* sceCameraGetAutoExposureGain fix
When option is provided and valid, size is also set to 0.
* Track opened handles
Extremely basic for now, if the library was ever properly implemented this could be swapped for a map of some kind instead.
* Fix errors for sceCameraStart
The firmware-related parameter checks come after the library opened check.
* Promote sceCameraIsAttached log to info
Since you don't need to initialize the library to call this function, some games will call sceCameraIsAttached before anything else.
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