Core/Movement: implement smooth waypoints

* delays can now be negative to support sniffed transition times from one waypoint path to another
* early transitions will now pick up the ongoing spline destination and start calculating their path from that point on
* waypoints may now use db side spline pathings in a new db table to support special spline shapes are not generated by normal pathfinding (e.g. scripted flight paths)
* current waypoints will still the work the way they did before for legacy and custom support

src/server/game/Movement/PathGenerator.cpp

@@ -19,6 +19,7 @@
 #include "PathGenerator.h"
 #include "Map.h"
 #include "Creature.h"
+#include "G3DPosition.hpp"
 #include "MMapFactory.h"
 #include "MMapManager.h"
 #include "Log.h"
@@ -55,21 +56,20 @@ PathGenerator::~PathGenerator()
     TC_LOG_DEBUG("maps.mmaps", "++ PathGenerator::~PathGenerator() for %u", _source->GetGUID().GetCounter());
 }
 
-bool PathGenerator::CalculatePath(float destX, float destY, float destZ, bool forceDest)
+bool PathGenerator::CalculatePath(float destX, float destY, float destZ, bool forceDest /*= false*/)
 {
-    float x, y, z;
-    _source->GetPosition(x, y, z);
+    return CalculatePath(PositionToVector3(_source->GetPosition()), G3D::Vector3(destX, destY, destZ), forceDest);
+}
 
-    if (!Trinity::IsValidMapCoord(destX, destY, destZ) || !Trinity::IsValidMapCoord(x, y, z))
+bool PathGenerator::CalculatePath(G3D::Vector3 const& startPoint, G3D::Vector3 const& endPoint, bool forceDest /*= false*/)
+{
+    if (!Trinity::IsValidMapCoord(startPoint.x, startPoint.y, startPoint.z) || !Trinity::IsValidMapCoord(endPoint.x, endPoint.y, endPoint.z))
         return false;
 
     TC_METRIC_EVENT("mmap_events", "CalculatePath", "");
 
-    G3D::Vector3 dest(destX, destY, destZ);
-    SetEndPosition(dest);
-
-    G3D::Vector3 start(x, y, z);
-    SetStartPosition(start);
+    SetEndPosition(endPoint);
+    SetStartPosition(startPoint);
 
     _forceDestination = forceDest;
 
@@ -79,7 +79,7 @@ bool PathGenerator::CalculatePath(float destX, float destY, float destZ, bool fo
     // check if the start and end point have a .mmtile loaded (can we pass via not loaded tile on the way?)
     const Unit* _sourceUnit = _source->ToUnit();
     if (!_navMesh || !_navMeshQuery || (_sourceUnit && _sourceUnit->HasUnitState(UNIT_STATE_IGNORE_PATHFINDING)) ||
-        !HaveTile(start) || !HaveTile(dest))
+        !HaveTile(startPoint) || !HaveTile(endPoint))
     {
         BuildShortcut();
         _type = PathType(PATHFIND_NORMAL | PATHFIND_NOT_USING_PATH);
@@ -88,7 +88,7 @@ bool PathGenerator::CalculatePath(float destX, float destY, float destZ, bool fo
 
     UpdateFilter();
 
-    BuildPolyPath(start, dest);
+    BuildPolyPath(startPoint, endPoint);
     return true;
 }