diff options
Diffstat (limited to 'engines/sci/engine/state.cpp')
| -rw-r--r-- | engines/sci/engine/state.cpp | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/engines/sci/engine/state.cpp b/engines/sci/engine/state.cpp index 85cf099a2c..13930d8a27 100644 --- a/engines/sci/engine/state.cpp +++ b/engines/sci/engine/state.cpp @@ -111,6 +111,7 @@ EngineState::EngineState(ResourceManager *res, Kernel *kernel, Vocabulary *voc, _doSoundType = SCI_VERSION_AUTODETECT; _lofsType = SCI_VERSION_AUTODETECT; _gfxFunctionsType = SCI_VERSION_AUTODETECT; + _moveCountType = kMoveCountUninitialized; } EngineState::~EngineState() { @@ -633,4 +634,40 @@ SciVersion EngineState::detectGfxFunctionsType() { return _gfxFunctionsType; } +MoveCountType EngineState::detectMoveCountType() { + if (_moveCountType == kMoveCountUninitialized) { + // SCI0/SCI01 games always increment move count + if (getSciVersion() <= SCI_VERSION_01) { + _moveCountType = kIncrementMoveCount; + return _moveCountType; + } + + reg_t motionClass = _segMan->findObjectByName("Motion"); + bool found = false; + + if (!motionClass.isNull()) { + Object *obj = _segMan->getObject(motionClass); + reg_t fptr; + + if (obj && lookup_selector(_segMan, motionClass, _kernel->_selectorCache.doit, NULL, &fptr) == kSelectorMethod) { + byte *buf = _segMan->getScript(fptr.segment)->_buf + fptr.offset; + int checksum = 0; + for (int i = 0; i < 8; i++) + checksum += *(buf++); + _moveCountType = (checksum == 0x216) ? kIncrementMoveCount : kIgnoreMoveCount; + found = true; + } + } + + if (!found) { + warning("Move count autodetection failed"); + _moveCountType = kIncrementMoveCount; // Most games do this, so best guess + } + + debugC(1, kDebugLevelVM, "Detected move count handling: %s", (_moveCountType == kIncrementMoveCount) ? "increment" : "ignore"); + } + + return _moveCountType; +} + } // End of namespace Sci |