0f9c33e02f in 2011 broke selector
breakpoints of the type "ObjName::", which previously caught all
selector sends of the named object.
Thanks to TMM and snover for noticing.
In SSCI, games could never start at tick 0 because the video
benchmarking code on game startup would take several ticks to
run. In ScummVM, where the benchmarking code is disabled, it
becomes possible for games to start at tick 0. This can break a
lot of kernel code, which uses tick 0 as a special value
indicating that a feature is not active. For example, in GK2,
the music at the start of the game will not fade in on systems
that are fast enough to start audio playback at tick 0, since
a fade start tick of 0 is used to indicate audio fade is disabled.
Fixes Trac#9830.
Calling to SciEngine::syncSoundSettings from GuestAdditions
recurses back into GuestAdditions, which is obviously not
desirable. Even when it didn't manage to cause infinite recursion
(as in SQ6 demo), it would make the UI behave in broken ways (e.g.
the +/- buttons on the music slider in SQ6 would not work because
the UI would just get updated immediately back to the closest
rounded value).
1. Unlocking all resources of a type using a resource ID of -1 is
gone in SCI32;
2. Audio locks need to be serialized starting in GK2 for the game's
modified kDoAudio(1) call;
3. Audio locks in SCI3 must work more like SSCI, since at least
Lighthouse's `BackMusic::fade` method will attempt to unlock
audio that was never locked by a script. In SSCI (and now in
ScummVM too) this is a no-op; previously in ScummVM, it would
remove Audio32's own lock on the audio resource, resulting in a
use-after-free;
4. kDoAudio(1) starting in GK2 returns the number of active
*not-in-memory* channels being played, not the total number of
active channels.
Fixes Trac#9675.
This seems to have been added in SCI1.1 and continued through
SCI32; older games with digital SFX (like KQ5CD) did not convert
the resource type in kLock.
This is not known to fix any problem, but was a noted difference
in the implementation between ScummVM and SSCI.
Willem Jan Palenstijn
Colin Snover
Walter van Niftrik
Thierry Crozat
Paul Gilbert
Tarek Soliman