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-rw-r--r--src/Blocks/BlockComparator.h5
-rw-r--r--src/Blocks/BlockPiston.h6
-rw-r--r--src/Simulator/IncrementalRedstoneSimulator/PistonHandler.h29
-rw-r--r--src/Simulator/IncrementalRedstoneSimulator/RedstoneComparatorHandler.h38
4 files changed, 63 insertions, 15 deletions
diff --git a/src/Blocks/BlockComparator.h b/src/Blocks/BlockComparator.h
index 394b53a15..ffd1bde61 100644
--- a/src/Blocks/BlockComparator.h
+++ b/src/Blocks/BlockComparator.h
@@ -60,6 +60,11 @@ public:
return true;
}
+ inline static bool IsOn(NIBBLETYPE a_Meta)
+ {
+ return ((a_Meta & 0x8) == 0x8);
+ }
+
inline static Vector3i GetSideCoordinate(const Vector3i & a_Position, NIBBLETYPE a_Meta, bool a_bInverse)
{
auto Position = a_Position;
diff --git a/src/Blocks/BlockPiston.h b/src/Blocks/BlockPiston.h
index 30ccc168d..18b688256 100644
--- a/src/Blocks/BlockPiston.h
+++ b/src/Blocks/BlockPiston.h
@@ -93,6 +93,9 @@ public:
return 11;
}
+ /** Returns true if the piston (with the specified meta) is extended */
+ static inline bool IsExtended(NIBBLETYPE a_PistonMeta) { return ((a_PistonMeta & 0x8) != 0x0); }
+
private:
typedef std::unordered_set<Vector3i, VectorHasher<int>> Vector3iSet;
@@ -100,9 +103,6 @@ private:
/** Returns true if the piston (specified by blocktype) is a sticky piston */
static inline bool IsSticky(BLOCKTYPE a_BlockType) { return (a_BlockType == E_BLOCK_STICKY_PISTON); }
- /** Returns true if the piston (with the specified meta) is extended */
- static inline bool IsExtended(NIBBLETYPE a_PistonMeta) { return ((a_PistonMeta & 0x8) != 0x0); }
-
/** Returns true if the specified block can be pushed by a piston (and left intact) */
static inline bool CanPush(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
{
diff --git a/src/Simulator/IncrementalRedstoneSimulator/PistonHandler.h b/src/Simulator/IncrementalRedstoneSimulator/PistonHandler.h
index 1ee68e521..f82ebdf94 100644
--- a/src/Simulator/IncrementalRedstoneSimulator/PistonHandler.h
+++ b/src/Simulator/IncrementalRedstoneSimulator/PistonHandler.h
@@ -39,14 +39,37 @@ public:
virtual cVector3iArray Update(const Vector3i & a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta, PoweringData a_PoweringData) override
{
// LOGD("Evaluating pisty the piston (%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);
- if (a_PoweringData.PowerLevel > 0)
+ // Delay is used here to prevent an infinite loop (#3168)
+ if (DelayInfo == nullptr)
{
- cBlockPistonHandler::ExtendPiston(a_Position, &m_World);
+ bool ShouldBeExtended = (a_PoweringData.PowerLevel != 0);
+ if (ShouldBeExtended != cBlockPistonHandler::IsExtended(a_Meta))
+ {
+ Data->m_MechanismDelays[a_Position] = std::make_pair(1, ShouldBeExtended);
+ }
}
else
{
- cBlockPistonHandler::RetractPiston(a_Position, &m_World);
+ int DelayTicks;
+ bool ShouldBeExtended;
+ std::tie(DelayTicks, ShouldBeExtended) = *DelayInfo;
+
+ if (DelayTicks == 0)
+ {
+ if (ShouldBeExtended)
+ {
+ cBlockPistonHandler::ExtendPiston(a_Position, &m_World);
+ }
+ else
+ {
+ cBlockPistonHandler::RetractPiston(a_Position, &m_World);
+ }
+
+ Data->m_MechanismDelays.erase(a_Position);
+ }
}
return {};
diff --git a/src/Simulator/IncrementalRedstoneSimulator/RedstoneComparatorHandler.h b/src/Simulator/IncrementalRedstoneSimulator/RedstoneComparatorHandler.h
index 95881990d..9a250a1fe 100644
--- a/src/Simulator/IncrementalRedstoneSimulator/RedstoneComparatorHandler.h
+++ b/src/Simulator/IncrementalRedstoneSimulator/RedstoneComparatorHandler.h
@@ -99,22 +99,42 @@ public:
virtual cVector3iArray Update(const Vector3i & a_Position, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta, PoweringData a_PoweringData) 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);
- if (GetPowerLevel(a_Position, a_BlockType, a_Meta) > 0)
+ // Delay is used here to prevent an infinite loop (#3168)
+ if (DelayInfo == nullptr)
{
- m_World.SetBlockMeta(a_Position, a_Meta | 0x8);
+ 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));
+
+ bool ShouldBeOn = (GetPowerLevel(a_Position, a_BlockType, a_Meta) > 0); // Provide visual indication by examining *rear* power level
+ bool ShouldUpdate = (Power != PreviousFrontPower.PowerLevel); // "Business logic" (:P) - determine by examining *side* power levels
+
+ if (ShouldUpdate || (ShouldBeOn != cBlockComparatorHandler::IsOn(a_Meta)))
+ {
+ Data->m_MechanismDelays[a_Position] = std::make_pair(1, ShouldBeOn);
+ }
}
else
{
- m_World.SetBlockMeta(a_Position, a_Meta & 0x7);
- }
+ int DelayTicks;
+ bool ShouldPowerOn;
+ std::tie(DelayTicks, ShouldPowerOn) = *DelayInfo;
- 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());
+ 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 });
+ }
}
return {};