1 files changed, 49 insertions, 60 deletions

diff --git a/src/Simulator/IncrementalRedstoneSimulator/RedstoneComparatorHandler.h b/src/Simulator/IncrementalRedstoneSimulator/RedstoneComparatorHandler.h
index 34c217e67..95881990d 100644
--- a/src/Simulator/IncrementalRedstoneSimulator/RedstoneComparatorHandler.h
+++ b/src/Simulator/IncrementalRedstoneSimulator/RedstoneComparatorHandler.h
@@ -18,33 +18,8 @@ public:
 	{
 	}
 
-	unsigned char GetFrontPowerLevel(const Vector3i & a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta, unsigned char a_HighestSidePowerLevel, unsigned char a_HighestRearPowerLevel)
+	unsigned char GetFrontPowerLevel(const Vector3i & a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta, unsigned char a_HighestSidePowerLevel)
 	{
-		if (cBlockComparatorHandler::IsInSubtractionMode(a_Meta))
-		{
-			// Subtraction mode
-			return static_cast<unsigned char>(std::max(static_cast<char>(a_HighestRearPowerLevel) - a_HighestSidePowerLevel, 0));
-		}
-		else
-		{
-			// Comparison mode
-			return (std::max(a_HighestSidePowerLevel, a_HighestRearPowerLevel) == a_HighestSidePowerLevel) ? 0 : a_HighestRearPowerLevel;
-		}
-	}
-
-	virtual unsigned char GetPowerDeliveredToPosition(const Vector3i & a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta, const Vector3i & a_QueryPosition, BLOCKTYPE a_QueryBlockType) override
-	{
-		UNUSED(a_QueryPosition);
-		UNUSED(a_QueryBlockType);
-
-		return (cBlockComparatorHandler::GetFrontCoordinate(a_Position, a_Meta & 0x3) == a_QueryPosition) ? static_cast<cIncrementalRedstoneSimulator *>(m_World.GetRedstoneSimulator())->GetChunkData()->GetCachedPowerData(a_Position).PowerLevel : 0;
-	}
-
-	virtual unsigned char GetPowerLevel(const Vector3i & a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta) override
-	{
-		UNUSED(a_Position);
-		UNUSED(a_BlockType);
-
 		class cContainerCallback : public cBlockEntityCallback
 		{
 		public:
@@ -56,13 +31,12 @@ public:
 			{
 				auto & Contents = static_cast<cBlockEntityWithItems *>(a_BlockEntity)->GetContents();
 				float Fullness = 0;  // Is a floating-point type to allow later calculation to produce a non-truncated value
-
 				for (int Slot = 0; Slot != Contents.GetNumSlots(); ++Slot)
 				{
-					Fullness += static_cast<float>(Contents.GetSlot(Slot).m_ItemCount) / Contents.GetSlot(Slot).GetMaxStackSize();
+					Fullness += Contents.GetSlot(Slot).m_ItemCount / Contents.GetSlot(Slot).GetMaxStackSize();
 				}
 
-				m_SignalStrength = (Fullness < 0.001 /* container empty? */) ? 0 : static_cast<unsigned char>(1 + (Fullness / Contents.GetNumSlots()) * 14);
+				m_SignalStrength = static_cast<unsigned char>(1 + (Fullness / Contents.GetNumSlots()) * 14);
 				return false;
 			}
 
@@ -72,7 +46,6 @@ public:
 		auto RearCoordinate = cBlockComparatorHandler::GetRearCoordinate(a_Position, a_Meta & 0x3);
 		m_World.DoWithBlockEntityAt(RearCoordinate.x, RearCoordinate.y, RearCoordinate.z, CCB);
 		auto RearPower = CCB.m_SignalStrength;
-
 		auto PotentialSourceHandler = cIncrementalRedstoneSimulator::CreateComponent(m_World, m_World.GetBlock(RearCoordinate), static_cast<cIncrementalRedstoneSimulator *>(m_World.GetRedstoneSimulator())->GetChunkData());
 		if (PotentialSourceHandler != nullptr)
 		{
@@ -84,48 +57,64 @@ public:
 			}
 		}
 
-		return RearPower;
+		if ((a_Meta & 0x4) == 0x4)
+		{
+			// Subtraction mode
+			return static_cast<unsigned char>(std::max(static_cast<char>(RearPower) - a_HighestSidePowerLevel, 0));
+		}
+		else
+		{
+			// Comparison mode
+			return (std::max(a_HighestSidePowerLevel, RearPower) == a_HighestSidePowerLevel) ? 0 : RearPower;
+		}
 	}
 
-	virtual cVector3iArray Update(const Vector3i & a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta, PoweringData a_PoweringData) override
+	virtual unsigned char GetPowerDeliveredToPosition(const Vector3i & a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta, const Vector3i & a_QueryPosition, BLOCKTYPE a_QueryBlockType) override
 	{
-		// Note that a_PoweringData here contains the maximum * side * power level, as specified by GetValidSourcePositions
-		// LOGD("Evaluating ALU the comparator (%d %d %d)", a_Position.x, a_Position.y, a_Position.z);
-		auto Data = static_cast<cIncrementalRedstoneSimulator *>(m_World.GetRedstoneSimulator())->GetChunkData();
-		auto DelayInfo = Data->GetMechanismDelayInfo(a_Position);
+		UNUSED(a_QueryPosition);
+		UNUSED(a_QueryBlockType);
 
-		// Delay is used here to prevent an infinite loop (#3168)
-		if (DelayInfo == nullptr)
-		{
-			auto RearPower = GetPowerLevel(a_Position, a_BlockType, a_Meta);
-			auto FrontPower = GetFrontPowerLevel(a_Position, a_BlockType, a_Meta, a_PoweringData.PowerLevel, RearPower);
-			auto PreviousFrontPower = static_cast<cIncrementalRedstoneSimulator *>(m_World.GetRedstoneSimulator())->GetChunkData()->ExchangeUpdateOncePowerData(a_Position, PoweringData(a_PoweringData.PoweringBlock, FrontPower));
+		return (cBlockComparatorHandler::GetFrontCoordinate(a_Position, a_Meta & 0x3) == a_QueryPosition) ? static_cast<cIncrementalRedstoneSimulator *>(m_World.GetRedstoneSimulator())->GetChunkData()->GetCachedPowerData(a_Position).PowerLevel : 0;
+	}
 
-			bool ShouldBeOn = (RearPower > 0);  // Provide visual indication by examining * rear * power level
-			bool ShouldUpdate = (FrontPower != PreviousFrontPower.PowerLevel);  // "Business logic" (:P) - determine by examining *side* power levels
+	virtual unsigned char GetPowerLevel(const Vector3i & a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta) override
+	{
+		UNUSED(a_Position);
+		UNUSED(a_BlockType);
 
-			if (ShouldUpdate || (ShouldBeOn != cBlockComparatorHandler::IsOn(a_Meta)))
+		auto RearCoordinate = cBlockComparatorHandler::GetRearCoordinate(a_Position, a_Meta & 0x3);
+		auto PotentialSourceHandler = cIncrementalRedstoneSimulator::CreateComponent(m_World, m_World.GetBlock(RearCoordinate), static_cast<cIncrementalRedstoneSimulator *>(m_World.GetRedstoneSimulator())->GetChunkData());
+		if (PotentialSourceHandler != nullptr)
+		{
+			BLOCKTYPE Type;
+			NIBBLETYPE Meta;
+			if (m_World.GetBlockTypeMeta(RearCoordinate.x, RearCoordinate.y, RearCoordinate.z, Type, Meta))
 			{
-				Data->m_MechanismDelays[a_Position] = std::make_pair(1, ShouldBeOn);
+				return PotentialSourceHandler->GetPowerDeliveredToPosition(RearCoordinate, Type, Meta, a_Position, a_BlockType);
 			}
 		}
+
+		return 0;
+	}
+
+	virtual cVector3iArray Update(const Vector3i & a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta, PoweringData a_PoweringData) override
+	{
+		// LOGD("Evaluating ALU the comparator (%d %d %d)", a_Position.x, a_Position.y, a_Position.z);
+
+		if (GetPowerLevel(a_Position, a_BlockType, a_Meta) > 0)
+		{
+			m_World.SetBlockMeta(a_Position, a_Meta | 0x8);
+		}
 		else
 		{
-			int DelayTicks;
-			bool ShouldPowerOn;
-			std::tie(DelayTicks, ShouldPowerOn) = *DelayInfo;
+			m_World.SetBlockMeta(a_Position, a_Meta & 0x7);
+		}
 
-			if (DelayTicks == 0)
-			{
-				m_World.SetBlockMeta(a_Position, ShouldPowerOn ? (a_Meta | 0x8) : (a_Meta & 0x7));
-				Data->m_MechanismDelays.erase(a_Position);
-
-				// Assume that an update (to front power) is needed.
-				// Note: potential inconsistencies will arise as power data is updated before-delay due to limitations of the power data caching functionality (only stores one bool)
-				// This means that other mechanisms like wires may get our new power data before our delay has finished
-				// This also means that we have to manually update ourselves to be aware of any changes that happened in the previous redstone tick
-				return StaticAppend(GetAdjustedRelatives(a_Position, GetRelativeLaterals()), { a_Position });
-			}
+		auto Power = GetFrontPowerLevel(a_Position, a_BlockType, a_Meta, a_PoweringData.PowerLevel);
+		auto PreviousFrontPower = static_cast<cIncrementalRedstoneSimulator *>(m_World.GetRedstoneSimulator())->GetChunkData()->ExchangeUpdateOncePowerData(a_Position, PoweringData(a_PoweringData.PoweringBlock, Power));
+		if (Power != PreviousFrontPower.PowerLevel)
+		{
+			return GetAdjustedRelatives(a_Position, GetRelativeLaterals());
 		}
 
 		return {};