AGI: Resource checking for setView/setLoop/setCel

Also loading view resources in case they are not loaded on set.view
Fixes crash in Larry 1 for Apple IIgs after getting beaten up
by taxi driver (was an original game bug). Even makes it work now.
Original interpreter closed down in this situation.
For setLoop() and setCel() error()s were added for this case
to avoid crashes.
Also: screenObj->viewData renamed to screenObj->viewResource

2 files changed, 34 insertions, 12 deletions

diff --git a/engines/agi/view.cpp b/engines/agi/view.cpp
index ac3e60ee6d..322afd8ec0 100644
--- a/engines/agi/view.cpp
+++ b/engines/agi/view.cpp
@@ -111,7 +111,6 @@ int AgiEngine::decodeView(byte *resourceData, uint16 resourceSize, int16 viewNr)
 
 	byte  *celCompressedData = nullptr;
 	uint16 celCompressedSize = 0;
-//	byte  *rawBitmap = nullptr;
 
 	debugC(5, kDebugLevelResources, "decode_view(%d)", viewNr);
 
@@ -431,14 +430,28 @@ void AgiEngine::unloadView(int16 viewNr) {
  * @param viewNr number of AGI view resource
  */
 void AgiEngine::setView(ScreenObjEntry *screenObj, int16 viewNr) {
-	screenObj->viewData = &_game.views[viewNr];
+	if (!(_game.dirView[viewNr].flags & RES_LOADED)) {
+		// View resource currently not loaded, this is probably a game bug
+		// Load the resource now to fix the issue, and give out a warning
+		// This happens in at least Larry 1 for Apple IIgs right after getting beaten up by taxi driver
+		// Original interpreter bombs out in this situation saying "view not loaded, Press ESC to quit"
+		warning("setView() called on screen object %d to use view %d, but view not loaded", screenObj->objectNr, viewNr);
+		warning("probably game script bug, trying to load view into memory");
+		if (agiLoadResource(RESOURCETYPE_VIEW, viewNr) != errOK) {
+			// loading failed, we better error() out now
+			error("setView() called to set view %d for screen object %d, which is not loaded atm and loading failed", viewNr, screenObj->objectNr);
+			return;
+		};
+	}
+
+	screenObj->viewResource = &_game.views[viewNr];
 	screenObj->currentViewNr = viewNr;
-	screenObj->loopCount = screenObj->viewData->loopCount;
+	screenObj->loopCount = screenObj->viewResource->loopCount;
 	screenObj->viewReplaced = true;
 
 	if (getVersion() < 0x2000) {
-		screenObj->stepSize = screenObj->viewData->headerStepSize;
-		screenObj->cycleTime = screenObj->viewData->headerCycleTime;
+		screenObj->stepSize = screenObj->viewResource->headerStepSize;
+		screenObj->cycleTime = screenObj->viewResource->headerCycleTime;
 		screenObj->cycleTimeCount = 0;
 	}
 	if (screenObj->currentLoopNr >= screenObj->loopCount) {
@@ -454,7 +467,11 @@ void AgiEngine::setView(ScreenObjEntry *screenObj, int16 viewNr) {
  * @param loopNr number of loop
  */
 void AgiEngine::setLoop(ScreenObjEntry *screenObj, int16 loopNr) {
-	assert(screenObj->viewData != NULL);
+	if (!(_game.dirView[screenObj->currentViewNr].flags & RES_LOADED)) {
+		error("setLoop() called on screen object %d, which has no loaded view resource assigned to it", screenObj->objectNr);
+		return;
+	}
+	assert(screenObj->viewResource);
 
 	if (screenObj->loopCount == 0) {
 		warning("setLoop() called on screen object %d, which has no loops (view %d)", screenObj->objectNr, screenObj->currentViewNr);
@@ -493,7 +510,16 @@ void AgiEngine::setLoop(ScreenObjEntry *screenObj, int16 loopNr) {
  * @param celNr number of cel
  */
 void AgiEngine::setCel(ScreenObjEntry *screenObj, int16 celNr) {
-	assert(screenObj->viewData != NULL);
+	if (!(_game.dirView[screenObj->currentViewNr].flags & RES_LOADED)) {
+		error("setCel() called on screen object %d, which has no loaded view resource assigned to it", screenObj->objectNr);
+		return;
+	}
+	assert(screenObj->viewResource);
+
+	if (screenObj->loopCount == 0) {
+		warning("setLoop() called on screen object %d, which has no loops (view %d)", screenObj->objectNr, screenObj->currentViewNr);
+		return;
+	}
 
 	AgiViewLoop *curViewLoop = &_game.views[screenObj->currentViewNr].loop[screenObj->currentLoopNr];
 
diff --git a/engines/agi/view.h b/engines/agi/view.h
index 04021260a3..e59916da78 100644
--- a/engines/agi/view.h
+++ b/engines/agi/view.h
@@ -47,10 +47,6 @@ struct AgiView {
 	byte *description;
 	int16 loopCount;
 	AgiViewLoop *loop;
-
-	//struct ViewLoop *loop;
-	//bool agi256_2;
-	//byte *resourceData;
 };
 
 enum MotionType {
@@ -98,7 +94,7 @@ struct ScreenObjEntry {
 	int16 yPos;
 	uint8 currentViewNr;
 	bool viewReplaced;
-	struct AgiView *viewData;
+	struct AgiView *viewResource;
 	uint8 currentLoopNr;
 	uint8 loopCount;
 	struct AgiViewLoop *loopData;