diff options
| -rw-r--r-- | engines/sci/engine/script_patches.cpp | 60 |
1 files changed, 58 insertions, 2 deletions
diff --git a/engines/sci/engine/script_patches.cpp b/engines/sci/engine/script_patches.cpp index a954d65a90..6915e12a0e 100644 --- a/engines/sci/engine/script_patches.cpp +++ b/engines/sci/engine/script_patches.cpp @@ -2775,9 +2775,64 @@ static const uint16 sq4CdSignatureWalkInFromBelowRoom45[] = { static const uint16 sq4CdPatchWalkInFromBelowRoom45[] = { PATCH_ADDTOOFFSET(+2), - 0x38, PATCH_UINT16(0x00bc), // pushi 00BCh + 0x38, PATCH_UINT16(0x00bc), // pushi 00BCh PATCH_ADDTOOFFSET(+15), - 0x38, PATCH_UINT16(0x00bb), // pushi 00BBh + 0x38, PATCH_UINT16(0x00bb), // pushi 00BBh + PATCH_END +}; + +// It seems that Sierra forgot to set a script flag, when cleaning out the bank account +// in Space Quest 4 CD. This was probably caused by the whole bank account interaction +// getting a rewrite and polish in the CD version. +// +// Because of this bug, points for changing back clothes will not get awarded, which +// makes it impossible to get a perfect point score in the CD version of the game. +// The points are awarded by rm371::doit in script 371. +// +// We fix this. Bug also happened, when using the original interpreter. +// Bug does not happen for PC floppy. +// +// Attention: Some Let's Plays on youtube show that points are in fact awarded. Which is true. +// But those Let's Plays were actually created by playing a hacked Space Quest 4 version +// (which is part Floppy, part CD version - we consider it to be effectively pirated) +// and not the actual CD version of Space Quest 4. +// It's easy to identify - talkie + store called "Radio Shack" -> is hacked version. +// +// Applies to at least: English PC CD +// Responsible method: but2Script::changeState(2) +// Fixes bug: #6866 +static const uint16 sq4CdSignatureGetPointsForChangingBackClothes[] = { + 0x35, 0x02, // ldi 02 + SIG_MAGICDWORD, + 0x1a, // eq? + 0x30, SIG_UINT16(0x006a), // bnt [state 3] + 0x76, + SIG_ADDTOOFFSET(+46), // jump over "withdraw funds" code + 0x33, 0x33, // jmp [end of state 2, set cycles code] + SIG_ADDTOOFFSET(+51), // jump over "clean bank account" code + 0x35, 0x02, // ldi 02 + 0x65, 0x1a, // aTop cycles + 0x33, 0x0b, // jmp [toss/ret] + 0x3c, // dup + 0x35, 0x03, // ldi 03 + 0x1a, // eq? + 0x31, 0x05, // bnt [toss/ret] + SIG_END +}; + +static const uint16 sq4CdPatchGetPointsForChangingBackClothes[] = { + PATCH_ADDTOOFFSET(+3), + 0x30, PATCH_UINT16(0x0070), // bnt [state 3] + PATCH_ADDTOOFFSET(+47), // "withdraw funds" code + 0x33, 0x39, // jmp [end of state 2, set cycles code] + PATCH_ADDTOOFFSET(+51), + 0x78, // push1 + 0x39, 0x1d, // ldi 1Dh + 0x45, 0x07, 0x02, // call export 7 of script 0 (set flag) -> effectively sets global 73h, bit 2 + 0x35, 0x02, // ldi 02 + 0x65, 0x1c, // aTop cycles + 0x33, 0x05, // jmp [toss/ret] + // check for state 3 code removed to save 6 bytes PATCH_END }; @@ -2876,6 +2931,7 @@ static const SciScriptPatcherEntry sq4Signatures[] = { { true, 298, "Floppy: endless flight", 1, sq4FloppySignatureEndlessFlight, sq4FloppyPatchEndlessFlight }, { true, 700, "Floppy: throw stuff at sequel police bug", 1, sq4FloppySignatureThrowStuffAtSequelPoliceBug, sq4FloppyPatchThrowStuffAtSequelPoliceBug }, { true, 45, "CD: walk in from below for room 45 fix", 1, sq4CdSignatureWalkInFromBelowRoom45, sq4CdPatchWalkInFromBelowRoom45 }, + { true, 396, "CD: get points for changing back clothes fix",1, sq4CdSignatureGetPointsForChangingBackClothes, sq4CdPatchGetPointsForChangingBackClothes }, { true, 0, "CD: Babble icon speech and subtitles fix", 1, sq4CdSignatureBabbleIcon, sq4CdPatchBabbleIcon }, { true, 818, "CD: Speech and subtitles option", 1, sq4CdSignatureTextOptions, sq4CdPatchTextOptions }, { true, 818, "CD: Speech and subtitles option button", 1, sq4CdSignatureTextOptionsButton, sq4CdPatchTextOptionsButton }, |