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SCI: Fix QFG4 Runes puzzle, bug #10965
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@sluicebox @bluegr
sluicebox authored and bluegr committed May 23, 2019
1 parent b1964b1 commit 67a29ad
Showing 1 changed file with 106 additions and 0 deletions.
106 changes: 106 additions & 0 deletions engines/sci/engine/script_patches.cpp
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Expand Up @@ -11294,6 +11294,110 @@ static const uint16 qfg4LeftoversPatch[] = {
PATCH_END
};

// The runes puzzle in room 800 often rejects the correct answer. When a letter
// is selected it turns red but it's not applied until after a 30 tick delay
// with no visual indicator. If a letter is clicked during that delay then the
// previous letter is silently skipped, which is common since the correct
// answer contains the same letter consecutively.
//
// There are two approaches to fixing this: remove the delay or disable input
// during it. We do both. Letters are now applied as soon as they turn red, but
// the delay prevented the puzzle from ending abruptly, and so we still pause
// after the puzzle is solved but disable input. This preserves the puzzle's
// external behavior while making it impossible to click too fast.
//
// This bug is in all versions but the CD version exacerbates it with its broken
// dial. Sierra upgraded the Cycle classes which changed the behavior the dial
// depends on. CycleTo no longer supports wrapping around cel ranges and so the
// dial can't move from "C" to "O" (cels 7 to 0) and doesn't spin around when
// selecting the same letter twice as it did in floppy.
//
// Applies to: All versions
// Responsible methods: proc_58 in script 801, runePuz:handleEvent, sTurnTheDial:changeState
// Fixes bug: #10965
static const uint16 qfg4RunesPuzzleSignature1[] = {
SIG_MAGICDWORD,
0x38, SIG_UINT16(0x0163), // pushi 0163
0x45, 0x02, SIG_UINT16(0x0002), // callb proc0_2 [ set flag 355, puzzle is solved ]
0x38, SIG_SELECTOR16(dispose), // pushi dispose
0x76, // push0
0x72, SIG_UINT16(0x0010), // lofsa runesPuz
0x4a, SIG_UINT16(0x0004), // send 04 [ runesPuz dispose: ]
SIG_END
};

static const uint16 qfg4RunesPuzzlePatch1[] = {
PATCH_ADDTOOFFSET(+7),
0x32, PATCH_UINT16(0x0007), // jmp 0007 [ don't exit puzzle immediately ]
PATCH_END
};

static const uint16 qfg4RunesPuzzleSignature2[] = {
// runePuz:handleEvent
0x63, SIG_ADDTOOFFSET(+1), // pToa register [ always zero, the following code is unused ]
SIG_MAGICDWORD,
0x31, 0x21, // bnt 21 [ handle mouse/key down events ]
0x39, 0x04, // pushi 04
0x39, SIG_ADDTOOFFSET(+1), // pushi type
0x76, // push0
0x87, 0x01, // lap 01
0x4a, SIG_UINT16(0x0004), // send 04 [ event type? ]
SIG_ADDTOOFFSET(+1349),
// sTurnTheDial:changeState
0x30, SIG_UINT16(0x0112), // bnt 0112 [ state 2 ]
SIG_ADDTOOFFSET(+268),
0x35, 0x1e, // ldi 1e
0x65, SIG_ADDTOOFFSET(+1), // aTop ticks
0x33, 0x20, // jmp 20 [ end of method ]
0x3c, // dup
0x35, 0x02, // ldi 02
0x1a, // eq?
0x31, 0x1a, // bnt 1a [ end of method ]
0x76, // push0
0x40, SIG_ADDTOOFFSET(+2), // call proc_58 [ apply letter to puzzle ]
SIG_UINT16(0x0000),
0x38, SIG_SELECTOR16(canControl), // pushi canControl
0x78, // push1
0x78, // push1
0x51, SIG_ADDTOOFFSET(+1), // class User
0x4a, SIG_UINT16(0x0006), // send 06 [ User canControl: 1 (unnecessary) ]
0x38, SIG_SELECTOR16(dispose), // pushi dispose
0x76, // push0
0x72, SIG_ADDTOOFFSET(+2), // lofsa sTurnTheDial
0x4a, SIG_UINT16(0x0004), // send 04 [ sTurnTheDial dispose: (unnecessary) ]
SIG_END
};

static const uint16 qfg4RunesPuzzlePatch2[] = {
// runePuz:handleEvent
0x78, // push1
0x38, PATCH_UINT16(0x0163), // pushi 0163
0x45, 0x04, PATCH_UINT16(0x0002), // callb proc0_3 [ is puzzle solved? ]
0x31, 0x1b, // bnt 1b [ handle mouse/key down events ]
0x32, PATCH_UINT16(0x01ec), // jmp 01ec [ ignore events if puzzle is solved ]
PATCH_ADDTOOFFSET(+1350),
// sTurnTheDial:changeState
0x30, PATCH_UINT16(0x0123), // bnt 0123 [ state 2 ]
PATCH_ADDTOOFFSET(+268),
0x76, // push0
0x40, PATCH_GETORIGINALUINT16ADJUST(+1648, +12), // call proc_58 [ apply letter to puzzle ]
PATCH_UINT16(0x0000),
0x39, 0x01, // push1
0x38, PATCH_UINT16(0x0163), // pushi 0163
0x45, 0x04, PATCH_UINT16(0x0002), // callb proc0_3 [ is puzzle solved? ]
0x31, 0x10, // bnt 10 [ end of method ]
0x35, 0x1e, // ldi 1e
0x65, PATCH_GETORIGINALBYTE(+1637), // aTop ticks [ pause 30 ticks before exiting puzzle ]
0x33, 0x0a, // jmp 0a [ end of method ]
0x38, PATCH_SELECTOR16(dispose), // pushi dispose
0x76, // push0
0x72, PATCH_UINT16(0x0010), // lofsa runesPuz
0x4a, PATCH_UINT16(0x0004), // send 04 [ runesPuz dispose: ]
0x3a, // toss
0x48, // ret
PATCH_END
};

// script, description, signature patch
static const SciScriptPatcherEntry qfg4Signatures[] = {
{ true, 0, "prevent autosave from deleting save games", 1, qfg4AutosaveSignature, qfg4AutosavePatch },
Expand Down Expand Up @@ -11352,6 +11456,8 @@ static const SciScriptPatcherEntry qfg4Signatures[] = {
{ true, 710, "fix tentacle retraction for mage (2/2)", 1, qfg4PitRopeMageSignature2, qfg4PitRopeMagePatch2 },
{ true, 800, "fix setScaler calls", 1, qfg4SetScalerSignature, qfg4SetScalerPatch },
{ true, 800, "fix grapnel removing hero's scaler", 1, qfg4RopeScalerSignature, qfg4RopeScalerPatch },
{ true, 801, "fix runes puzzle (1/2)", 1, qfg4RunesPuzzleSignature1, qfg4RunesPuzzlePatch1 },
{ true, 801, "fix runes puzzle (2/2)", 1, qfg4RunesPuzzleSignature2, qfg4RunesPuzzlePatch2 },
{ true, 803, "fix sliding down slope", 1, qfg4SlidingDownSlopeSignature, qfg4SlidingDownSlopePatch },
{ true, 810, "fix conditional void calls", 1, qfg4ConditionalVoidSignature, qfg4ConditionalVoidPatch },
{ true, 830, "fix conditional void calls", 2, qfg4ConditionalVoidSignature, qfg4ConditionalVoidPatch },
Expand Down

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