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-rw-r--r--src/Mobs/Path.cpp260
1 files changed, 202 insertions, 58 deletions
diff --git a/src/Mobs/Path.cpp b/src/Mobs/Path.cpp
index dd306af13..e987381f7 100644
--- a/src/Mobs/Path.cpp
+++ b/src/Mobs/Path.cpp
@@ -6,20 +6,15 @@
#include "Path.h"
#include "../Chunk.h"
+#define JUMP_G_COST 20
+
#define DISTANCE_MANHATTAN 0 // 1: More speed, a bit less accuracy 0: Max accuracy, less speed.
#define HEURISTICS_ONLY 0 // 1: Much more speed, much less accurate.
-#define CALCULATIONS_PER_STEP 5 // Higher means more CPU load but faster path calculations.
+#define CALCULATIONS_PER_STEP 10 // Higher means more CPU load but faster path calculations.
// The only version which guarantees the shortest path is 0, 0.
-enum class eCellStatus {OPENLIST, CLOSEDLIST, NOLIST};
-struct cPathCell
-{
- Vector3i m_Location; // Location of the cell in the world.
- int m_F, m_G, m_H; // F, G, H as defined in regular A*.
- eCellStatus m_Status; // Which list is the cell in? Either non, open, or closed.
- cPathCell * m_Parent; // Cell's parent, as defined in regular A*.
- bool m_IsSolid; // Is the cell an air or a solid? Partial solids are currently considered solids.
-};
+
+
@@ -37,24 +32,40 @@ bool compareHeuristics::operator()(cPathCell * & a_Cell1, cPathCell * & a_Cell2)
/* cPath implementation */
cPath::cPath(
cChunk & a_Chunk,
- const Vector3i & a_StartingPoint, const Vector3i & a_EndingPoint, int a_MaxSteps,
+ const Vector3d & a_StartingPoint, const Vector3d & a_EndingPoint, int a_MaxSteps,
double a_BoundingBoxWidth, double a_BoundingBoxHeight,
int a_MaxUp, int a_MaxDown
) :
- m_Destination(a_EndingPoint.Floor()),
- m_Source(a_StartingPoint.Floor()),
+
m_CurrentPoint(0), // GetNextPoint increments this to 1, but that's fine, since the first cell is always a_StartingPoint
- m_Chunk(&a_Chunk)
+ m_Chunk(&a_Chunk),
+ m_BadChunkFound(false)
{
// TODO: if src not walkable OR dest not walkable, then abort.
// Borrow a new "isWalkable" from ProcessIfWalkable, make ProcessIfWalkable also call isWalkable
+ a_BoundingBoxWidth = 1; // Until we improve physics, if ever.
+
+ m_BoundingBoxWidth = CeilC(a_BoundingBoxWidth);
+ m_BoundingBoxHeight = CeilC(a_BoundingBoxHeight);
+ m_HalfWidth = a_BoundingBoxWidth / 2;
+
+ int HalfWidthInt = FloorC(a_BoundingBoxWidth / 2);
+ m_Source.x = FloorC(a_StartingPoint.x - HalfWidthInt);
+ m_Source.y = FloorC(a_StartingPoint.y);
+ m_Source.z = FloorC(a_StartingPoint.z - HalfWidthInt);
+
+ m_Destination.x = FloorC(a_EndingPoint.x - HalfWidthInt);
+ m_Destination.y = FloorC(a_EndingPoint.y);
+ m_Destination.z = FloorC(a_EndingPoint.z - HalfWidthInt);
+
if (GetCell(m_Source)->m_IsSolid || GetCell(m_Destination)->m_IsSolid)
{
m_Status = ePathFinderStatus::PATH_NOT_FOUND;
return;
}
+ m_NearestPointToTarget = GetCell(m_Source);
m_Status = ePathFinderStatus::CALCULATING;
m_StepsLeft = a_MaxSteps;
@@ -81,15 +92,20 @@ cPath::~cPath()
ePathFinderStatus cPath::Step(cChunk & a_Chunk)
{
m_Chunk = &a_Chunk;
-
if (m_Status != ePathFinderStatus::CALCULATING)
{
return m_Status;
}
- if (m_StepsLeft == 0)
+ if (m_BadChunkFound)
{
FinishCalculation(ePathFinderStatus::PATH_NOT_FOUND);
+ return m_Status;
+ }
+
+ if (m_StepsLeft == 0)
+ {
+ AttemptToFindAlternative();
}
else
{
@@ -102,9 +118,9 @@ ePathFinderStatus cPath::Step(cChunk & a_Chunk)
break; // if we're here, m_Status must have changed either to PATH_FOUND or PATH_NOT_FOUND.
}
}
- }
- m_Chunk = nullptr;
+ m_Chunk = nullptr;
+ }
return m_Status;
}
@@ -112,6 +128,17 @@ ePathFinderStatus cPath::Step(cChunk & a_Chunk)
+Vector3i cPath::AcceptNearbyPath()
+{
+ ASSERT(m_Status == ePathFinderStatus::NEARBY_FOUND);
+ m_Status = ePathFinderStatus::PATH_FOUND;
+ return m_Destination;
+}
+
+
+
+
+
bool cPath::IsSolid(const Vector3i & a_Location)
{
ASSERT(m_Chunk != nullptr);
@@ -119,6 +146,7 @@ bool cPath::IsSolid(const Vector3i & a_Location)
auto Chunk = m_Chunk->GetNeighborChunk(a_Location.x, a_Location.z);
if ((Chunk == nullptr) || !Chunk->IsValid())
{
+ m_BadChunkFound = true;
return true;
}
m_Chunk = Chunk;
@@ -129,13 +157,19 @@ bool cPath::IsSolid(const Vector3i & a_Location)
int RelZ = a_Location.z - m_Chunk->GetPosZ() * cChunkDef::Width;
m_Chunk->GetBlockTypeMeta(RelX, a_Location.y, RelZ, BlockType, BlockMeta);
- if ((BlockType == E_BLOCK_FENCE) || (BlockType == E_BLOCK_FENCE_GATE))
+ if (
+ (BlockType == E_BLOCK_FENCE) ||
+ (BlockType == E_BLOCK_FENCE_GATE) ||
+ (BlockType == E_BLOCK_NETHER_BRICK_FENCE) ||
+ ((BlockType >= E_BLOCK_SPRUCE_FENCE_GATE) && (BlockType <= E_BLOCK_ACACIA_FENCE))
+ )
{
+ // TODO move this out of IsSolid to a proper place.
GetCell(a_Location + Vector3i(0, 1, 0))->m_IsSolid = true; // Mobs will always think that the fence is 2 blocks high and therefore won't jump over.
}
if (BlockType == E_BLOCK_STATIONARY_WATER)
{
- GetCell(a_Location + Vector3i(0, -1, 0))->m_IsSolid = true; // Mobs will always think that the fence is 2 blocks high and therefore won't jump over.
+ GetCell(a_Location + Vector3i(0, -1, 0))->m_IsSolid = true;
}
return cBlockInfo::IsSolid(BlockType);
@@ -149,50 +183,81 @@ bool cPath::Step_Internal()
{
cPathCell * CurrentCell = OpenListPop();
- // Path not reachable, open list exauhsted.
+ // Path not reachable.
if (CurrentCell == nullptr)
{
- FinishCalculation(ePathFinderStatus::PATH_NOT_FOUND);
- ASSERT(m_Status == ePathFinderStatus::PATH_NOT_FOUND);
+ AttemptToFindAlternative();
return true;
}
// Path found.
- if (
- (CurrentCell->m_Location == m_Destination + Vector3i(0, 0, 1)) ||
- (CurrentCell->m_Location == m_Destination + Vector3i(1, 0, 0)) ||
- (CurrentCell->m_Location == m_Destination + Vector3i(-1, 0, 0)) ||
- (CurrentCell->m_Location == m_Destination + Vector3i(0, 0, -1)) ||
- (CurrentCell->m_Location == m_Destination + Vector3i(0, -1, 0))
- )
+ if (CurrentCell->m_Location == m_Destination)
{
- do
- {
- m_PathPoints.push_back(CurrentCell->m_Location); // Populate the cPath with points.
- CurrentCell = CurrentCell->m_Parent;
- } while (CurrentCell != nullptr);
-
+ BuildPath();
FinishCalculation(ePathFinderStatus::PATH_FOUND);
return true;
}
- // Calculation not finished yet, process a currentCell by inspecting all neighbors.
+ // Calculation not finished yet.
+ // Check if we have a new NearestPoint.
+ // TODO I don't like this that much, there should be a smarter way.
+ if ((m_Destination - CurrentCell->m_Location).Length() < 5)
+ {
+ if (m_Rand.NextInt(4) == 0)
+ {
+ m_NearestPointToTarget = CurrentCell;
+ }
+ }
+ else if (CurrentCell->m_H < m_NearestPointToTarget->m_H)
+ {
+ m_NearestPointToTarget = CurrentCell;
+ }
+ // process a currentCell by inspecting all neighbors.
+
- // Check North, South, East, West on all 3 different heights.
- int i;
- for (i = -1; i <= 1; ++i)
+ // Check North, South, East, West on our height.
+ ProcessIfWalkable(CurrentCell->m_Location + Vector3i(1, 0, 0), CurrentCell, 10);
+ ProcessIfWalkable(CurrentCell->m_Location + Vector3i(-1, 0, 0), CurrentCell, 10);
+ ProcessIfWalkable(CurrentCell->m_Location + Vector3i(0, 0, 1), CurrentCell, 10);
+ ProcessIfWalkable(CurrentCell->m_Location + Vector3i(0, 0, -1), CurrentCell, 10);
+
+ // Check diagonals on XY plane.
+ // x = -1: west, x = 1: east.
+ for (int x = -1; x <= 1; x += 2)
{
- ProcessIfWalkable(CurrentCell->m_Location + Vector3i(1, i, 0), CurrentCell, 10);
- ProcessIfWalkable(CurrentCell->m_Location + Vector3i(-1, i, 0), CurrentCell, 10);
- ProcessIfWalkable(CurrentCell->m_Location + Vector3i(0, i, 1), CurrentCell, 10);
- ProcessIfWalkable(CurrentCell->m_Location + Vector3i(0, i, -1), CurrentCell, 10);
+ if (GetCell(CurrentCell->m_Location + Vector3i(x, 0, 0))->m_IsSolid) // If there's a solid our east / west.
+ {
+ if (!GetCell(CurrentCell->m_Location + Vector3i(0, 1, 0))->m_IsSolid) // If there isn't a solid above.
+ {
+ ProcessIfWalkable(CurrentCell->m_Location + Vector3i(x, 1, 0), CurrentCell, JUMP_G_COST); // Check east-up / west-up.
+ }
+ }
+ else
+ {
+ ProcessIfWalkable(CurrentCell->m_Location + Vector3i(x, -1, 0), CurrentCell, 14); // Else check east-down / west-down.
+ }
+ }
+
+ // Check diagonals on the YZ plane.
+ for (int z = -1; z <= 1; z += 2)
+ {
+ if (GetCell(CurrentCell->m_Location + Vector3i(0, 0, z))->m_IsSolid) // If there's a solid our north / south.
+ {
+ if (!GetCell(CurrentCell->m_Location + Vector3i(0, 1, 0))->m_IsSolid) // If there isn't a solid above.
+ {
+ ProcessIfWalkable(CurrentCell->m_Location + Vector3i(0, 1, z), CurrentCell, JUMP_G_COST); // Check north-up / south-up.
+ }
+ }
+ else
+ {
+ ProcessIfWalkable(CurrentCell->m_Location + Vector3i(0, -1, z), CurrentCell, 14); // Else check north-down / south-down.
+ }
}
- // Check diagonals on mob's height only.
- int x, z;
- for (x = -1; x <= 1; x += 2)
+ // Check diagonals on the XZ plane. (Normal diagonals, this plane is special because of gravity, etc)
+ for (int x = -1; x <= 1; x += 2)
{
- for (z = -1; z <= 1; z += 2)
+ for (int z = -1; z <= 1; z += 2)
{
// This condition prevents diagonal corner cutting.
if (!GetCell(CurrentCell->m_Location + Vector3i(x, 0, 0))->m_IsSolid && !GetCell(CurrentCell->m_Location + Vector3i(0, 0, z))->m_IsSolid)
@@ -213,6 +278,38 @@ bool cPath::Step_Internal()
+void cPath::AttemptToFindAlternative()
+{
+ if (m_NearestPointToTarget == GetCell(m_Source))
+ {
+ FinishCalculation(ePathFinderStatus::PATH_NOT_FOUND);
+ }
+ else
+ {
+ m_Destination = m_NearestPointToTarget->m_Location;
+ BuildPath();
+ FinishCalculation(ePathFinderStatus::NEARBY_FOUND);
+ }
+}
+
+
+
+
+
+void cPath::BuildPath()
+{
+ cPathCell * CurrentCell = GetCell(m_Destination);
+ do
+ {
+ m_PathPoints.push_back(CurrentCell->m_Location); // Populate the cPath with points.
+ CurrentCell = CurrentCell->m_Parent;
+ } while (CurrentCell != nullptr);
+}
+
+
+
+
+
void cPath::FinishCalculation()
{
m_Map.clear();
@@ -225,6 +322,10 @@ void cPath::FinishCalculation()
void cPath::FinishCalculation(ePathFinderStatus a_NewStatus)
{
+ if (m_BadChunkFound)
+ {
+ a_NewStatus = ePathFinderStatus::PATH_NOT_FOUND;
+ }
m_Status = a_NewStatus;
FinishCalculation();
}
@@ -250,7 +351,7 @@ cPathCell * cPath::OpenListPop() // Popping from the open list also means addin
{
if (m_OpenList.size() == 0)
{
- return nullptr; // We've exhausted the search space and nothing was found, this will trigger a PATH_NOT_FOUND status.
+ return nullptr; // We've exhausted the search space and nothing was found, this will trigger a PATH_NOT_FOUND or NEARBY_FOUND status.
}
cPathCell * Ret = m_OpenList.top();
@@ -269,7 +370,53 @@ si::setBlock((Ret)->m_Location.x, (Ret)->m_Location.y, (Ret)->m_Location.z, debu
void cPath::ProcessIfWalkable(const Vector3i & a_Location, cPathCell * a_Parent, int a_Cost)
{
cPathCell * cell = GetCell(a_Location);
- if (!cell->m_IsSolid && GetCell(a_Location + Vector3i(0, -1, 0))->m_IsSolid && !GetCell(a_Location + Vector3i(0, 1, 0))->m_IsSolid)
+ int x, y, z;
+
+ // Make sure we fit in the position.
+ for (y = 0; y < m_BoundingBoxHeight; ++y)
+ {
+ for (x = 0; x < m_BoundingBoxWidth; ++x)
+ {
+ for (z = 0; z < m_BoundingBoxWidth; ++z)
+ {
+ if (GetCell(a_Location + Vector3i(x, y, z))->m_IsSolid)
+ {
+ return;
+ }
+ }
+ }
+ }
+
+ /*y =-1;
+ for (x = 0; x < m_BoundingBoxWidth; ++x)
+ {
+ for (z = 0; z < m_BoundingBoxWidth; ++z)
+ {
+ if (!GetCell(a_Location + Vector3i(x, y, z))->m_IsSolid)
+ {
+ return;
+ }
+ }
+ }
+ ProcessCell(cell, a_Parent, a_Cost);*/
+
+ // Make sure there's at least 1 piece of solid below us.
+
+ bool GroundFlag = false;
+ y =-1;
+ for (x = 0; x < m_BoundingBoxWidth; ++x)
+ {
+ for (z = 0; z < m_BoundingBoxWidth; ++z)
+ {
+ if (GetCell(a_Location + Vector3i(x, y, z))->m_IsSolid)
+ {
+ GroundFlag = true;
+ break;
+ }
+ }
+ }
+
+ if (GroundFlag)
{
ProcessCell(cell, a_Parent, a_Cost);
}
@@ -338,23 +485,20 @@ void cPath::ProcessCell(cPathCell * a_Cell, cPathCell * a_Caller, int a_GDelta)
cPathCell * cPath::GetCell(const Vector3i & a_Location)
{
// Create the cell in the hash table if it's not already there.
- cPathCell * Cell;
if (m_Map.count(a_Location) == 0) // Case 1: Cell is not on any list. We've never checked this cell before.
{
- Cell = new cPathCell();
- Cell->m_Location = a_Location;
- m_Map[a_Location] = UniquePtr<cPathCell>(Cell);
- Cell->m_IsSolid = IsSolid(a_Location);
- Cell->m_Status = eCellStatus::NOLIST;
+ m_Map[a_Location].m_Location = a_Location;
+ m_Map[a_Location].m_IsSolid = IsSolid(a_Location);
+ m_Map[a_Location].m_Status = eCellStatus::NOLIST;
#ifdef COMPILING_PATHFIND_DEBUGGER
#ifdef COMPILING_PATHFIND_DEBUGGER_MARK_UNCHECKED
si::setBlock(a_Location.x, a_Location.y, a_Location.z, debug_unchecked, Cell->m_IsSolid ? NORMAL : MINI);
#endif
#endif
- return Cell;
+ return &m_Map[a_Location];
}
else
{
- return m_Map[a_Location].get();
+ return &m_Map[a_Location];
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-02 06:20:07 +0200