Fixed KQ5CD (regression from rev. 46656)

svn-id: r46839

1 files changed, 11 insertions, 3 deletions

diff --git a/engines/sci/engine/kmisc.cpp b/engines/sci/engine/kmisc.cpp
index 6522f78ce7..819b3a78b7 100644
--- a/engines/sci/engine/kmisc.cpp
+++ b/engines/sci/engine/kmisc.cpp
@@ -252,10 +252,18 @@ enum kPlatformOps {
 };
 
 reg_t kPlatform(EngineState *s, int argc, reg_t *argv) {
-	bool isWindows = ((SciEngine*)g_engine)->getPlatform() == Common::kPlatformWindows;
+	if (argc == 0) {
+		// This is called in KQ5CD with no parameters, where
+		// it seems to do some graphics driver check. This
+		// kernel function didn't have subfunctions then.
+		// If 0 is returned, the game functions normally,
+		// otherwise all the animations show up like a
+		// slideshow (e.g. in the intro). So we return 0 :)
+		return NULL_REG;
+	}
 
-	// No arguments is the same as operation 0
-	uint16 operation = (argc == 1) ? argv[0].toUint16() : 0;
+	bool isWindows = ((SciEngine*)g_engine)->getPlatform() == Common::kPlatformWindows;
+	uint16 operation = argv[0].toUint16();
 
 	switch (operation) {
 	case kPlatformUnk0: