MOHAWK: Add a generic temp var for use by Myst scripts.

svn-id: r54632

3 files changed, 24 insertions, 15 deletions

diff --git a/engines/mohawk/myst_scripts.cpp b/engines/mohawk/myst_scripts.cpp
index 533bda8ba9..85c90249d7 100644
--- a/engines/mohawk/myst_scripts.cpp
+++ b/engines/mohawk/myst_scripts.cpp
@@ -217,8 +217,13 @@ MystScript MystScriptParser::readScript(Common::SeekableReadStream *stream, Myst
 }
 
 uint16 MystScriptParser::getVar(uint16 var) {
-	warning("Unimplemented var getter 0x%02x (%d)", var, var);
-	return _vm->_varStore->getVar(var);
+	switch(var) {
+	case 105:
+		return _tempVar;
+	default:
+		warning("Unimplemented var getter 0x%02x (%d)", var, var);
+		return _vm->_varStore->getVar(var);
+	}
 }
 
 void MystScriptParser::toggleVar(uint16 var) {
@@ -227,8 +232,14 @@ void MystScriptParser::toggleVar(uint16 var) {
 }
 
 bool MystScriptParser::setVarValue(uint16 var, uint16 value) {
-	warning("Unimplemented var setter 0x%02x (%d)", var, var);
-	_vm->_varStore->setVar(var, value);
+	if (var == 105) {
+		if (_tempVar != value)
+			_tempVar = value;
+	} else {
+		warning("Unimplemented var setter 0x%02x (%d)", var, var);
+		_vm->_varStore->setVar(var, value);
+	}
+
 	return false;
 }
 
diff --git a/engines/mohawk/myst_scripts.h b/engines/mohawk/myst_scripts.h
index 249345e2f2..c0d2ce6a70 100644
--- a/engines/mohawk/myst_scripts.h
+++ b/engines/mohawk/myst_scripts.h
@@ -131,20 +131,20 @@ protected:
 		const char *desc;
 	};
 
-	const MystOpcode *_opcodes;
-	void setupOpcodes();
-	MystResource *_invokingResource;
 	uint16 _opcodeCount;
+	const MystOpcode *_opcodes;
 
-	static const uint8 stack_map[];
-	static const uint16 start_card[];
+	MystResource *_invokingResource;
 
 	uint16 _savedCardId;
 	uint16 _savedCursorId;
+	uint16 _tempVar; // Generic temp var used by the scripts
 
-	void varUnusedCheck(uint16 op, uint16 var);
-
+	static const uint8 stack_map[];
+	static const uint16 start_card[];
 
+	void setupOpcodes();
+	void varUnusedCheck(uint16 op, uint16 var);
 };
 
 }
diff --git a/engines/mohawk/myst_scripts_myst.cpp b/engines/mohawk/myst_scripts_myst.cpp
index 33ce2f88f2..3020d26d15 100644
--- a/engines/mohawk/myst_scripts_myst.cpp
+++ b/engines/mohawk/myst_scripts_myst.cpp
@@ -2680,10 +2680,8 @@ void MystScriptParser_Myst::opcode_203(uint16 op, uint16 var, uint16 argc, uint1
 		break;
 	case kMystStack:
 		// Used for Card 4138 (Dock Forechamber Door)
-		if (argc == 0) {
-			g_opcode203Parameters.enabled = true;
-		} else
-			unknown(op, var, argc, argv);
+		// Set forechamber door to closed
+		setVarValue(105, 0);
 		break;
 	case kMechanicalStack:
 		// Used for Card 6043 (Weapons Rack with Snake Box)