According to the documentation, the BIOS will
always initialize a valid video configuration
before the application is started, so applications can reasonably expect to be able to inherit that
mode by just querying it or making small
modifications to it and leaving other parameters
untouched. Some of the SDK sample programs, such
as the MGL samples, rely on this behavior.
To accomodate this, if no video mode has been
configured when _VidConfig() is called, initialize and enable video in Nuance's default state if the
application doesn't specify a main display config. Separate booleans still track whether the actual
main plane or overlay plane contain valid surfaces.
According to the documentation, the BIOS will always initialize a valid video configuration before the application is started, so applications can reasonably expect to be able to inherit that mode by just querying it or making small modifications to it and leaving other parameters untouched. Some of the SDK sample programs, such as the MGL samples, rely on this behavior.
To accomodate this, if no video mode has been configured when _VidConfig() is called, initialize and enable video in Nuance's default state if the application doesn't specify a main display config. Separate booleans still track whether the actual main plane or overlay plane contain valid surfaces.