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SCI32: Implement ScummVM save/load

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This commit is contained in:
Colin Snover 2016-09-15 08:54:10 -05:00
parent b5d0fffb8b
commit 1eb6d90eec
3 changed files with 122 additions and 56 deletions
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125
engines/sci/sci.cpp
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@ -496,61 +496,86 @@ static byte patchGameRestoreSave[] = {
};
// SCI2 version: Same as above, but the second parameter to callk is a word
static byte patchGameRestoreSaveSci2[] = {
0x39, 0x03, // pushi 03
0x76, // push0
0x38, 0xff, 0xff, // pushi -1
0x76, // push0
0x43, 0xff, 0x06, 0x00, // callk kRestoreGame/kSaveGame (will get changed afterwards)
0x48, // ret
// and third parameter is a string reference
static byte patchGameRestoreSci2[] = {
0x39, 0x03, // pushi 03
0x76, // push0 (game name)
0x38, 0xff, 0xff, // pushi -1 (save number)
0x89, 0x1b, // lsg global[27] (game version)
0x43, 0xff, 0x06, 0x00, // callk kRestoreGame (0xFF will be overwritten by patcher)
0x48, // ret
};
// SCI21 version: Same as above, but the second parameter to callk is a word
static byte patchGameRestoreSaveSci21[] = {
0x39, 0x04, // pushi 04
0x76, // push0 // 0: save, 1: restore (will get changed afterwards)
0x76, // push0
0x38, 0xff, 0xff, // pushi -1
0x76, // push0
0x43, 0xff, 0x08, 0x00, // callk kSave (will get changed afterwards)
0x48, // ret
static byte patchGameSaveSci2[] = {
0x39, 0x04, // pushi 04
0x76, // push0 (game name)
0x38, 0xff, 0xff, // pushi -1 (save number)
0x76, // push0 (save description)
0x89, 0x1b, // lsg global[27] (game version)
0x43, 0xff, 0x08, 0x00, // callk kSaveGame (0xFF will be overwritten by patcher)
0x48, // ret
};
// SCI2.1mid version: Same as above, but with an extra subop parameter
static byte patchGameRestoreSci21[] = {
0x39, 0x04, // pushi 04
0x78, // push1 (subop)
0x76, // push0 (game name)
0x38, 0xff, 0xff, // pushi -1 (save number)
0x89, 0x1b, // lsg global[27] (game version)
0x43, 0xff, 0x08, 0x00, // callk kSave (0xFF will be overwritten by patcher)
0x48, // ret
};
static byte patchGameSaveSci21[] = {
0x39, 0x05, // pushi 05
0x76, // push0 (subop)
0x76, // push0 (game name)
0x38, 0xff, 0xff, // pushi -1 (save number)
0x76, // push0 (save description)
0x89, 0x1b, // lsg global[27] (game version)
0x43, 0xff, 0x0a, 0x00, // callk kSave (0xFF will be overwritten by patcher)
0x48, // ret
};
static void patchGameSaveRestoreCode(SegManager *segMan, reg_t methodAddress, byte id) {
Script *script = segMan->getScript(methodAddress.getSegment());
byte *patchPtr = const_cast<byte *>(script->getBuf(methodAddress.getOffset()));
if (getSciVersion() <= SCI_VERSION_1_1) {
memcpy(patchPtr, patchGameRestoreSave, sizeof(patchGameRestoreSave));
} else { // SCI2+
memcpy(patchPtr, patchGameRestoreSaveSci2, sizeof(patchGameRestoreSaveSci2));
if (g_sci->isBE()) {
// LE -> BE
patchPtr[9] = 0x00;
patchPtr[10] = 0x06;
}
}
memcpy(patchPtr, patchGameRestoreSave, sizeof(patchGameRestoreSave));
patchPtr[8] = id;
}
static void patchGameSaveRestoreCodeSci21(SegManager *segMan, reg_t methodAddress, byte id, bool doRestore) {
#ifdef ENABLE_SCI32
static void patchGameSaveRestoreCodeSci2(SegManager *segMan, reg_t methodAddress, byte id, bool doRestore) {
Script *script = segMan->getScript(methodAddress.getSegment());
byte *patchPtr = const_cast<byte *>(script->getBuf(methodAddress.getOffset()));
memcpy(patchPtr, patchGameRestoreSaveSci21, sizeof(patchGameRestoreSaveSci21));
int kcallOffset;
if (doRestore)
patchPtr[2] = 0x78; // push1
if (g_sci->isBE()) {
// LE -> BE
patchPtr[10] = 0x00;
patchPtr[11] = 0x08;
if (getSciVersion() < SCI_VERSION_2_1_MIDDLE) {
if (doRestore) {
memcpy(patchPtr, patchGameRestoreSci2, sizeof(patchGameRestoreSci2));
kcallOffset = 9;
} else {
memcpy(patchPtr, patchGameSaveSci2, sizeof(patchGameSaveSci2));
kcallOffset = 10;
}
} else {
if (doRestore) {
memcpy(patchPtr, patchGameRestoreSci21, sizeof(patchGameRestoreSci21));
kcallOffset = 10;
} else {
memcpy(patchPtr, patchGameSaveSci21, sizeof(patchGameSaveSci21));
kcallOffset = 11;
}
}
patchPtr[9] = id;
patchPtr[kcallOffset] = id;
if (g_sci->isBE()) {
SWAP(patchPtr[kcallOffset + 1], patchPtr[kcallOffset + 2]);
}
}
#endif
void SciEngine::patchGameSaveRestore() {
SegManager *segMan = _gamestate->_segMan;
@ -595,17 +620,21 @@ void SciEngine::patchGameSaveRestore() {
uint16 selectorId = gameSuperObject->getFuncSelector(methodNr);
Common::String methodName = _kernel->getSelectorName(selectorId);
if (methodName == "restore") {
if (kernelIdSave != kernelIdRestore)
#ifdef ENABLE_SCI32
if (getSciVersion() >= SCI_VERSION_2) {
patchGameSaveRestoreCodeSci2(segMan, gameSuperObject->getFunction(methodNr), kernelIdRestore, true);
} else
#endif
patchGameSaveRestoreCode(segMan, gameSuperObject->getFunction(methodNr), kernelIdRestore);
else
patchGameSaveRestoreCodeSci21(segMan, gameSuperObject->getFunction(methodNr), kernelIdRestore, true);
}
else if (methodName == "save") {
if (_gameId != GID_FAIRYTALES) { // Fairy Tales saves automatically without a dialog
if (kernelIdSave != kernelIdRestore)
#ifdef ENABLE_SCI32
if (getSciVersion() >= SCI_VERSION_2) {
patchGameSaveRestoreCodeSci2(segMan, gameSuperObject->getFunction(methodNr), kernelIdSave, false);
} else
#endif
patchGameSaveRestoreCode(segMan, gameSuperObject->getFunction(methodNr), kernelIdSave);
else
patchGameSaveRestoreCodeSci21(segMan, gameSuperObject->getFunction(methodNr), kernelIdSave, false);
}
}
}
@ -629,10 +658,12 @@ void SciEngine::patchGameSaveRestore() {
Common::String methodName = _kernel->getSelectorName(selectorId);
if (methodName == "save") {
if (_gameId != GID_FAIRYTALES) { // Fairy Tales saves automatically without a dialog
if (kernelIdSave != kernelIdRestore)
#ifdef ENABLE_SCI32
if (getSciVersion() >= SCI_VERSION_2) {
patchGameSaveRestoreCodeSci2(segMan, gameSuperObject->getFunction(methodNr), kernelIdSave, false);
} else
#endif
patchGameSaveRestoreCode(segMan, patchObjectSave->getFunction(methodNr), kernelIdSave);
else
patchGameSaveRestoreCodeSci21(segMan, patchObjectSave->getFunction(methodNr), kernelIdSave, false);
}
break;
}