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SCI: Fix QFG3 floating spears in GOG version

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Fixes bug #11426
This commit is contained in:
sluicebox 2021-04-07 11:29:22 -07:00
parent 4714d67188
commit f58e87baea
1 changed files with 32 additions and 0 deletions
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32
engines/sci/engine/script_patches.cpp
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@ -13269,6 +13269,37 @@ static const uint16 qfg3PatchNrsAngerGuardian[] = {
PATCH_END
};
// The NRS fan-patch, which is included with the GOG release, has a script bug
// which causes spears to float during the moving target contest in room 460.
// The patch throttles the speed of several room objects with a technique that
// assumes there will only be one instance of each. trackSpear is responsible
// for updating the position of a spear that hits the moving target and one of
// these is created for each spear. Each trackSpear uses the same variable to
// enforce their doit throttling and so they stomp on each other's values.
// Subsequent trackSpears never make it past the throttling code and are stuck.
//
// We fix this by patching out the buggy trackSpear throttling. Disabling this
// code has no effect on speed because it turns out that trackSpear isn't
// responsible for any speeds in the first place.
//
// Applies to: Any version with NRS patches 460.HEP/SCR, such as GOG
// Responsible method: trackSpear:doit
// Fixes bug: #11426
static const uint16 qfg3SignatureNrsFloatingSpears[] = {
0x78, // push1
SIG_MAGICDWORD,
0x89, 0x58, // lsg 58 [ game time ]
0x83, 0x67, // lal 67 [ game time of previous trackSpear:doit ]
SIG_ADDTOOFFSET(+15),
0xa3, 0x67, // sal 67 [ store game time ]
SIG_END
};
static const uint16 qfg3PatchNrsFloatingSpears[] = {
0x32, PATCH_UINT16(0x0013), // jmp 0013 [ skip trackSpear throttling ]
PATCH_END
};
// script, description, signature patch
static const SciScriptPatcherEntry qfg3Signatures[] = {
{ true, 944, "import dialog continuous calls", 1, qfg3SignatureImportDialog, qfg3PatchImportDialog },
@ -13280,6 +13311,7 @@ static const SciScriptPatcherEntry qfg3Signatures[] = {
{ true, 285, "missing points for telling about initiation heap", 1, qfg3SignatureMissingPoints1, qfg3PatchMissingPoints1 },
{ true, 285, "missing points for telling about initiation script", 1, qfg3SignatureMissingPoints2a, qfg3PatchMissingPoints2 },
{ true, 285, "missing points for telling about initiation script", 1, qfg3SignatureMissingPoints2b, qfg3PatchMissingPoints2 },
{ true, 460, "NRS: floating spears", 1, qfg3SignatureNrsFloatingSpears, qfg3PatchNrsFloatingSpears },
{ true, 550, "combat speed throttling script", 1, qfg3SignatureCombatSpeedThrottling1, qfg3PatchCombatSpeedThrottling1 },
{ true, 550, "combat speed throttling heap", 1, qfg3SignatureCombatSpeedThrottling2, qfg3PatchCombatSpeedThrottling2 },
{ true, 750, "hero goes out of bounds in room 750", 2, qfg3SignatureRoom750Bounds1, qfg3PatchRoom750Bounds1 },