diff options
| -rw-r--r-- | engines/sci/engine/script_patches.cpp | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/engines/sci/engine/script_patches.cpp b/engines/sci/engine/script_patches.cpp index 4d429bbd8f..fe547cbedf 100644 --- a/engines/sci/engine/script_patches.cpp +++ b/engines/sci/engine/script_patches.cpp @@ -5556,6 +5556,34 @@ static const uint16 laurabow1PatchLeftStairsLockupFix[] = { PATCH_END }; +// LB1's fingerprint copy protection randomly rejects the correct answer and may +// even fail to draw a fingerprint. myCopy:init selects the fingerprint by +// generating random loop and cel numbers for view 553, but it passes incorrect +// ranges to kRandom. If kRandom returns the maximum value then the loop or cel +// overflow and a different image is displayed than what was intended. +// +// We correct the ranges from 0-600 and 1-1000 to 0-599 and 0-999 so that +// invalid cel 6 and loop 10 are never used after the script divides by 10. +// +// Applies to: DOS, Amiga, Atari ST +// Responsible method: myCopy:init +static const uint16 laurabow1SignatureCopyProtectionRandomFix[] = { + 0x38, SIG_UINT16(0x0258), // pushi 600d + SIG_ADDTOOFFSET(+10), + SIG_MAGICDWORD, + 0x78, // push1 + 0x38, SIG_UINT16(0x03e8), // pushi 1000d + SIG_END +}; + +static const uint16 laurabow1PatchCopyProtectionRandomFix[] = { + 0x38, PATCH_UINT16(0x0257), // pushi 599d + PATCH_ADDTOOFFSET(+10), + 0x76, // push0 + 0x38, PATCH_UINT16(0x03e7), // pushi 999d + PATCH_END +}; + // script, description, signature patch static const SciScriptPatcherEntry laurabow1Signatures[] = { { true, 4, "easter egg view fix", 1, laurabow1SignatureEasterEggViewFix, laurabow1PatchEasterEggViewFix }, @@ -5568,6 +5596,7 @@ static const SciScriptPatcherEntry laurabow1Signatures[] = { { true, 58, "chapel candles persistence", 1, laurabow1SignatureChapelCandlesPersistence, laurabow1PatchChapelCandlesPersistence }, { true, 236, "tell Lilly about Gertie blocking fix 1/2", 1, laurabow1SignatureTellLillyAboutGerieBlockingFix1, laurabow1PatchTellLillyAboutGertieBlockingFix1 }, { true, 236, "tell Lilly about Gertie blocking fix 2/2", 1, laurabow1SignatureTellLillyAboutGerieBlockingFix2, laurabow1PatchTellLillyAboutGertieBlockingFix2 }, + { true, 414, "copy protection random fix", 1, laurabow1SignatureCopyProtectionRandomFix, laurabow1PatchCopyProtectionRandomFix }, { true, 998, "obstacle collision lockups fix", 1, laurabow1SignatureObstacleCollisionLockupsFix, laurabow1PatchObstacleCollisionLockupsFix }, SCI_SIGNATUREENTRY_TERMINATOR }; |