Foreground's update, caused by GAMESTATE->m_fMusicSeconds moving backwards.
This happens due to frame skips confusing GameSoundManager::GetFrameTimingAdjustment.
It expects that, when the framerate is stable, each frame will take 1/FPS.
If we skip a frame, it thinks one frame is 30ms late, and tries to
adjust by 30-16ms. Reduce the threshold for this adjustment to half a frame;
if we're that much late, the problem isn't scheduling jitter--we've probably
dropped a frame, and adjusting here is incorrect.
In case that isn't enough, clamp fDeltaTime in Foreground, too.
I suspect this makes it pretty much impossible to use (although the guy with the pad has the glowing report of, "and it seemed to work OK") but without actually having a pad with which to test, it's about all I can do.
Screens typically have two general simple models of transitioning;
either the menu elements transition out, or we drop a fade on top
of everything. The former leaves the background in place, the
latter doesn't. Transitioning is usually used when we're going
to a screen with the same background; fading is used otherwise.
(There are combinations of these, and more complex modes, but
these are the basics.)
Traditionally, cancelling has always wiped. It usually goes back
to the title menu, which rarely has the same background; and it's
an uncommon path, so it's not worth setting up a full transition
for. However, for cases where we don't go all the way back, this
is incorrect; it looks very strange to press escape in the options
submenu or the player options menu, and to have it wipe the screen.
I've dealt with this in the past by setting up a "cancel" transition
that simply runs "Off" and waits. That works, but it's a pain, since
the wait duration needs to line up with the length of the transition.
Instead, add a transition mode "CancelTransitionsOut" that causes
Cancel to run the Out transition directly. (This also plays the
start sound, due to a discrepency right now: with Out, it's the
screen's job to play the sound, but with Cancel, it's the transition's
job. Figure that out later ...)
Ultimately, we should be able to have full CancelCommand transitions
if we want, but the SWME TweenOnScreen/TweenOffScreen code transition
needs to be completed first (replacing individual transitions with a
single "On"/"Off" command).
Chris Danford