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SCI: Fix QFG1VGA inventory weight warn, bug #10942

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Fix a script bug that breaks the game when picking mushrooms or other
actions if they trigger an inventory weight warning
This commit is contained in:
sluicebox 2019-04-22 21:26:53 -07:00 • committed by Filippos Karapetis
parent 8c32927f39
commit b568680e56
1 changed files with 55 additions and 0 deletions
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55
engines/sci/engine/script_patches.cpp
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@ -7896,6 +7896,60 @@ static const uint16 qfg1vgaPatchSpeedTest[] = {
PATCH_END
};
// QFG1VGA has a bug where exceeding the weight limit during certain scenes
// breaks the character screen for the rest of the game. Picking mushrooms,
// searching cheetaurs, and fetching the seed are among the vulnerable actions.
//
// When adding inventory, ego:get displays a warning if the new items exceed the
// weight limit. If this happens while qfgMessager is displaying a message
// then both will display at the same time but only one will be disposed. This
// leaves an extra entry in the kernel's window list for the rest of the game.
// kDisplay then sends text to the wrong window, breaking the character screen
// and others, and prevents the player from ever viewing their stats.
//
// We fix this by adding a check to ego:get that skips displaying messages if a
// dialog already exists. This is what Sierra did in the Mac version after
// reverting the scene-specific patches they issued for the PC version.
//
// Applies to: PC Floppy
// Responsible method: ego:get
// Fixes bug: #10942
static const uint16 qfg1vgaSignatureInventoryWeightWarn[] = {
0x8f, 0x00, // lsp 00
0x35, 0x01, // ldi 01
0x1a, // eq?
0x31, 0x04, // bnt 04
0x35, 0x01, // ldi 01
0x33, 0x02, // jmp 02
0x87, 0x02, // lap 02
0xa5, SIG_MAGICDWORD, 0x01, // sat 01
0x38, SIG_UINT16(0x024d), // pushi amount [ hard-coded for PC ]
0x76, // push0
0x85, 0x00, // lat 00
0x4a, 0x04, // send 04 [ temp0 amount? ]
0xa5, 0x02, // sat 02
SIG_ADDTOOFFSET(+0x0092),
0x8d, 0x01, // lst 01
SIG_END
};
static const uint16 qfg1vgaPatchInventoryWeightWarn[] = {
0x87, 0x00, // lap 00
0x78, // push1 [ save 1 byte ]
0x1a, // eq?
0x2f, 0x02, // bt 02 [ save 4 bytes ]
0x87, 0x02, // lap 02
0xa5, 0x01, // sat 01
0x38, PATCH_UINT16(0x024d), // pushi amount [ hard-coded for PC ]
0x76, // push0
0x85, 0x00, // lat 00
0x4a, 0x04, // send 04 [ temp0 amount? ]
0xa5, 0x02, // sat 02
0x81, 0x19, // lag 19 [ dialog ]
0x2e, PATCH_UINT16(0x0092), // bt 0092 [ skip messages if dialog ]
PATCH_END
};
// The baby antwerps in room 78 lockup the game if they get in ego's way when
// exiting south. They also crash the interpreter if they wander too far off
// the screen. These problems also occur in Sierra's interpreter.
@ -8071,6 +8125,7 @@ static const uint16 qfg1vgaPatchMacLogoIntroSkip[] = {
// script, description, signature patch
static const SciScriptPatcherEntry qfg1vgaSignatures[] = {
{ true, 0, "inventory weight warning", 1, qfg1vgaSignatureInventoryWeightWarn, qfg1vgaPatchInventoryWeightWarn },
{ true, 41, "moving to castle gate", 1, qfg1vgaSignatureMoveToCastleGate, qfg1vgaPatchMoveToCastleGate },
{ true, 55, "healer's hut, no delay for buy/steal", 1, qfg1vgaSignatureHealerHutNoDelay, qfg1vgaPatchHealerHutNoDelay },
{ true, 73, "brutus script freeze glitch", 1, qfg1vgaSignatureBrutusScriptFreeze, qfg1vgaPatchBrutusScriptFreeze },