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SCI: Add a workaround for script bug #3537232

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The bug in question is "SCI: SQ4 Floppy DOS title screen skipping too
quickly", and is caused by game scripts not waiting between palette calls
This commit is contained in:
Filippos Karapetis 2012-06-24 19:52:37 +03:00
parent 478fd0ed29
commit 99de89c974
1 changed files with 14 additions and 0 deletions
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14
engines/sci/engine/kgraphics.cpp
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@ -645,6 +645,20 @@ reg_t kPaletteAnimate(EngineState *s, int argc, reg_t *argv) {
if (paletteChanged)
g_sci->_gfxPalette->kernelAnimateSet();
// WORKAROUND: The game scripts in SQ4 floppy count the number of elapsed
// cycles in the intro from the number of successive kAnimate calls during
// the palette cycling effect, while showing the SQ4 logo. This worked in
// older computers because each animate call took awhile to complete.
// Normally, such scripts are handled automatically by our speed throttler,
// however in this case there are no calls to kGameIsRestarting (where the
// speed throttler gets called) between the different palette animation calls.
// Thus, we add a small delay between each animate call to make the whole
// palette animation effect slower and visible, and not have the logo screen
// get skipped because the scripts don't wait between animation steps. Fixes
// bug #3537232.
if (g_sci->getGameId() == GID_SQ4 && !g_sci->isCD() && s->currentRoomNumber() == 1)
g_sci->sleep(10);
return s->r_acc;
}