Implement code to unpack anim steps into UObject

Source/Integration/AnimQueue.cpp

@@ -47,15 +47,15 @@ FString FlxAnimQueueDecoder::DebugString(std::string_view queue) {
 	FlxAnimQueueDecoder decoder(queue);
 	while (!decoder.AtEOF()) {
 		FlxAnimStep step = decoder.ReadStep();
-		FString stepdebug = FlxAnimStepDecoder::DebugString(step);
+		FString stepdebug = FlxAnimStepDecoder::DebugString(step.Body);
 		result.Appendf(TEXT("%s\n"), *stepdebug);
 	}
 	return result;
 }
 
-FString FlxAnimStepDecoder::DebugString(const FlxAnimStep& step) {
+FString FlxAnimStepDecoder::DebugString(std::string_view body) {
 	FString result;
-	FlxAnimStepDecoder decoder(step);
+	FlxAnimStepDecoder decoder(body);
 	bool first = true;
 	while (!decoder.AtEOF()) {
 		FlxAnimField field = decoder.ReadField();
@@ -83,6 +83,78 @@ FString FlxAnimStepDecoder::DebugString(const FlxAnimStep& step) {
 	return result;
 }
 
+bool FlxAnimStepDecoder::ClearProperties(const FString& prefix, UObject* obj) {
+	UClass* uclass = obj->GetClass();
+	if (prefix.IsEmpty()) {
+		return false;
+	}
+	FName prefixlo(prefix);
+	FName prefixhi(prefix + TEXT("\xFFFF"));
+	for (TFieldIterator<FProperty> It(uclass); It; ++It)
+	{
+		FProperty* fprop = *It;
+		bool match1 = (fprop->GetFName().Compare(prefixlo) > 0);
+		bool match2 = (fprop->GetFName().Compare(prefixhi) < 0);
+		if (match1 && match2) {
+			uint8* pptr = fprop->ContainerPtrToValuePtr<uint8>(obj);
+			fprop->ClearValue(pptr);
+		}
+	}
+	return true;
+}
+
+bool FlxAnimStepDecoder::SetProperty(const FString& name, UObject* obj, const FlxAnimField& field) {
+	UClass* uclass = obj->GetClass();
+	FName nname(name);
+	switch (field.Type) {
+		case ElxAnimValueType::STRING: {
+			FStrProperty* fprop = FindFProperty<FStrProperty>(uclass, nname);
+			if (fprop == nullptr) return false;
+			FString* pptr = fprop->ContainerPtrToValuePtr<FString>(obj);
+			*pptr = FString(field.S.size(), (const UTF8CHAR*)field.S.data());
+			return true;
+		}
+		case ElxAnimValueType::NUMBER: {
+			FDoubleProperty* fprop = FindFProperty<FDoubleProperty>(uclass, nname);
+			if (fprop == nullptr) return false;
+			double* pptr = fprop->ContainerPtrToValuePtr<double>(obj);
+			fprop->SetPropertyValue(pptr, field.X);
+			return true;
+		}
+		case ElxAnimValueType::BOOLEAN: {
+			FBoolProperty* fprop = FindFProperty<FBoolProperty>(uclass, nname);
+			if (fprop == nullptr) return false;
+			uint8* pptr = fprop->ContainerPtrToValuePtr<uint8>(obj);
+			fprop->SetPropertyValue(pptr, (field.X == 1.0));
+			return true;
+		}
+		case ElxAnimValueType::XYZ: {
+			FStructProperty* fprop = FindFProperty<FStructProperty>(uclass, nname);
+			if (fprop == nullptr) return false;
+			if (fprop->Struct != TBaseStructure<FVector>::Get()) return false;
+			FVector* pptr = fprop->ContainerPtrToValuePtr<FVector>(obj);
+			*pptr = FVector(field.X, field.Y, field.Z);
+			return true;
+		}
+	}
+	return false;
+}
+
+#pragma optimize("", off)
+bool FlxAnimStepDecoder::UnpackInto(std::string_view body, const FString& prefix, bool preclear, UObject* obj) {
+	UClass* uclass = obj->GetClass();
+	FlxAnimStepDecoder decoder(body);
+	bool ok = true;
+	if (preclear) {
+		ok &= ClearProperties(prefix, obj);
+	}
+	while (!decoder.AtEOF()) {
+		FlxAnimField field = decoder.ReadField();
+		FString sname(field.Name.size(), (const UTF8CHAR*)field.Name.data());
+		ok &= SetProperty(prefix + sname, obj, field);
+	}
+	return ok;
+}
 
 FlxAnimTracker::FlxAnimTracker() {
 	AQ.Empty();

Source/Integration/AnimQueue.h

@@ -141,11 +141,12 @@ class FlxAnimStepDecoder {
 private:
 	FlxStringDecoder Decoder;
 
+	static bool ClearProperties(const FString& prefix, UObject* obj);
+	static bool SetProperty(const FString& name, UObject *obj, const FlxAnimField& value);
 public:
 	// Initialize the FlxAnimStepDecoder from the FlxAnimStep.
 	// 
-	FlxAnimStepDecoder(const FlxAnimStep &step) : Decoder(step.Body) {}
+	FlxAnimStepDecoder(std::string_view body) : Decoder(body) {}
-	FlxAnimStepDecoder(const FlxAnimStoredStep& step) : Decoder(step.Body) {}
 
 	// Return true if the parser has reached the end of the string.
 	//
@@ -157,7 +158,33 @@ public:
 
 	// Convert an AnimStep to an FString.
 	//
-	static FString DebugString(const FlxAnimStep &step);
+	static FString DebugString(std::string_view body);
+
+	// Unpack an AnimStep into a UObject
+	//
+	// Stores the key-value pairs of the animation step into
+	// properties of a UObject.  For example, if the key-value
+	// pair "color=blue" is present in the AnimStep, then this
+	// routine tries to find a string property "color" in the
+	// UObject, and then it sets that property to "blue."
+	//
+	// Returns true if all of the key-value pairs in the
+	// animation step could be unpacked into fields of the UObject.
+	// This could fail, for instance, if the UObject just doesn't
+	// contain one of the necessary properties.  It can also
+	// fail if there's a type mismatch.  For example, "color=blue"
+	// cannot be stored in a property "color" of type int.
+	//
+	// The prefix is prepended to the key names.  For example,
+	// if one of the key-value pairs is "color=blue", and the
+	// prefix is "aq", then the property "aqColor=blue" will be
+	// stored in the UObject.
+	//
+	// If pre-clear is true, then all properties of the UObject
+	// starting with the specified prefix are cleared before
+	// unpacking the animation step.
+	//
+	static bool UnpackInto(std::string_view body, const FString &prefix, bool preclear, UObject* obj);
 };
 
 ////////////////////////////////////////////////

Source/Integration/IntegrationGameModeBase.cpp

@@ -104,6 +104,15 @@ void AIntegrationGameModeBase::MaybeTriggerUpdateTask(float deltaseconds) {
 	}
 }
 
+//#pragma optimize( "", off )
+//void SetLocal(UObject* obj, const char *name, int value) {
+//	FString sname((const UTF8CHAR *)name);
+//	FName nname(sname);
+//	UClass* uclass = obj->GetClass();
+//	FProperty* fprop = FindFProperty<FProperty>(uclass, nname);
+//	FStructProperty* sprop = FindFProperty<FStructProperty>(uclass, nname);
+//}
+
 void AIntegrationGameModeBase::UpdateTangibles() {
 	if (!Playing) return;
 	FlxLockedWrapper w(LockableWrapper);
@@ -130,6 +139,9 @@ void AIntegrationGameModeBase::UpdateTangibles() {
 		FlxAnimStoredStep step;
 		ElxAnimPlaybackMode mode = t->AnimTracker.GetNextStep(step);
 		bool started = false;
+		if (mode != ElxAnimPlaybackMode::INVALID) {
+			FlxAnimStepDecoder::UnpackInto(step.Body, TEXT("aq"), true, t->Actor);
+		}
 		switch (mode) {
 		case ElxAnimPlaybackMode::INVALID:
 			started = false; // Nothing to do.