This subop is used only by RAMA.
The VMD objects in RAMA's game code contain a frame rate field,
which is usually -1, but occasionally is not. In the cases where
it is not -1, it appears to be either set for a video with sound
(so the value doesn't do anything to that video), or it is just
resetting back to the baked-in frame rate of the video file (so
it doesn't need to exist, except to fix videos broken by earlier
played videos with explicit frame rates).
Since this is a global state flag that does not get reset in SSCI,
the ultimate effect of kPlayVMDSetFrameRate in RAMA is that it does
nothing to any of the videos where the explicit frame rate is set,
but it does inadvertently cause *other* videos with no sound and no
explicit frame rate to have a different frame rate depending upon
what was played earlier in the game (and whether or not the engine
was restarted in the meantime).
This bad transferring of frame rates is most noticeable with the
exit-video of the vidmail player, which is played when you back out
after selecting a vidmail. Its nominal framerate is 10fps, but it
will play at whatever frame rate was last set by some other video
that happened to have an explicit frame rate, even if that frame
rate was bogus.
So, just ignore all calls to this subop, as it is fatally buggy.
Near the end of the game, RAMA will start trying to store some
invalid references. This does not affect the save game negatively
in any way, but it was causing the kernel to assert a signature
failure.
In the original interpreter, is it valid to pass a null reference
to both kArray(GetData) (it just acts as an identity function when
the passed argument is not an object) and to kString functions (it
always dereferences to an empty string).
Fixes Trac#10039.
Non-use of these kernel calls was assumed by reviewing script
disassembly by SV, but it turns out that SV was not picking up
script patches correctly in SCI3 games, so this data is no longer
considered reliable.
Upon investigation of Sound code across SCI32 games, it was
determined that there are actually (at least) 3 different
revisions, not just a single SCI2.1 version. This patch only
changes the parts of Sound code that are relevant to the correct
use of Audio32.
Fixes Trac#9736, Trac#9756, Trac#9767, Trac#9791.
This "fix" is more of a hack, in the interest of making the game
completable. The root cause is a combination of two problems in
the game scripts:
1. Blink::init expects to receive either 0 or 2 arguments, but
it assumes that if it received *any* arguments, it must have
received 2 arguments. This assumption is wrong, though,
because--
2. soTorinWhoAreYou::changeState(0) calls
poPecandEyes::setCycle(Blink) without including a second
argument (the blink speed).
This ends up with the second parameter being some garbage, and
that garbage gets sent to kRandom which then complains about
receiving garbage.
The correct fix for this would be to fix soTorinWhoAreYou (in
script 51400) to pass a second argument to setCycle, but there are
not enough obvious spare bytes for a quick and easy patch, so this
workaround will have to do for now.
Fixes Trac#9779.
Also added in depth comments about the currently known variations
Returning the RNG seed is now implemented (although it seems no
games actually use this functionality, it seems to be just script
bugs).
Also remove Torin kRandom workarounds.
Hoyle5 will spin on kGetTime between 15 and 300 ticks in multiple
game scripts in order to delay execution (for example, after
choosing opponents and clicking "okay"). This causes ScummVM to
be unresponsive and wastes CPU time.
This commit patches the spin subroutines to instead call a kernel
function (kWait) that waits without a spin loop. This kernel
function was removed in SCI2, and has been added back in ScummVM
specifically for Hoyle5, so this patch will not work with the
original interpreter.
Game scripts pass an extra argument which is never used in SSCI.
This happens e.g. when warping from room 620 to room 860 in
LSL6hires.
Adding a signature for kPalVarySetVary for SCI2.1early games only
does not work because KQ7 1.51 is detected as SCI2.1early but the
interpreter includes kPalVary code that matches SCI2.1mid.
Fixes Trac#9611.
