ZVISION: Workaround for bug #6770

Explicitly check if the time tunnel is open (and therefore shown in
close-up) before executing the scripts that draw the lever that is
shown in the normal view. This apparently doesn't happen in the
original engine, which suggests there may be a ScummVM bug. But it
still doesn't seem like the *wrong* thing to do here.

1 files changed, 18 insertions, 0 deletions

diff --git a/engines/zvision/scripting/scr_file_handling.cpp b/engines/zvision/scripting/scr_file_handling.cpp
index a8344ad5f4..cfbde110ad 100644
--- a/engines/zvision/scripting/scr_file_handling.cpp
+++ b/engines/zvision/scripting/scr_file_handling.cpp
@@ -141,6 +141,24 @@ bool ScriptManager::parseCriteria(Common::SeekableReadStream &stream, Common::Li
 		criteriaList.back().push_back(entry);
 	}
 
+	// WORKAROUND for a script bug in Zork: Grand Inquisitor, room me2j
+	// (Closing the Time Tunnels). When the time tunnel is open the game
+	// shows a close-up of only the tunnel, instead of showing the entire
+	// booth. However, the scripts that draw the lever in its correct
+	// state do not test this flag, causing it to be drawn when it should
+	// not be. This bug does not happen in the original game, suggesting
+	// a ScummVM bug. But I'm not aware of any other such glitches, and it
+	// still seems like a correct way of working around bug #6770.
+	if (_engine->getGameId() == GID_GRANDINQUISITOR && key == 9536) {
+		Puzzle::CriteriaEntry entry;
+		entry.key = 9404; // me2j_time_tunnel_open
+		entry.criteriaOperator = Puzzle::EQUAL_TO;
+		entry.argumentIsAKey = false;
+		entry.argument = 0;
+
+		criteriaList.back().push_back(entry);
+	}
+
 	while (!stream.eos() && !line.contains('}')) {
 		Puzzle::CriteriaEntry entry;