public SDS MergeWith(SDS other, MergeStrategy strategy, EntityChange.ExecutionContext ctx)
{
if (Generation != other.Generation)
{
throw new IntegrityViolation("Generation mismatch: " + Generation + " != " + other.Generation);
}
SDS exclusiveSource = null;
int exclusiveChoice = 0;
if (strategy == MergeStrategy.Exclusive || strategy == MergeStrategy.ExclusiveWithPositionCorrection)
{
exclusiveChoice = SelectExclusiveSource(this, other);
exclusiveSource = (exclusiveChoice == -1 ? this : other);
}
InconsistencyCoverage merged = InconsistencyCoverage.GetMinimum(IC, other.IC);
EntityPool pool = new EntityPool(ctx);
foreach (var e in this.FinalEntities)
{
if (IC.IsInconsistentR(ctx.LocalSpace.Relativate(e.ID.Position)))
{
continue; //for now
}
pool.Insert(e);
}
foreach (var e in other.FinalEntities)
{
if (other.IC.IsInconsistentR(ctx.LocalSpace.Relativate(e.ID.Position)))
{
continue; //for now
}
if (pool.Contains(e.ID.Guid))
{
continue;
}
pool.Insert(e);
}
//at this point we merged all fully consistent entities from either. If the inconsistent areas did not overlap then the result should contain all entities in their consistent state
if (!merged.IsFullyConsistent)
{
if (strategy == MergeStrategy.EntitySelective)
{
MergeInconsistentEntitiesComp(pool, this, other, merged, ctx);
}
else
{
MergeInconsistentEntitiesEx(pool, exclusiveSource, strategy == MergeStrategy.ExclusiveWithPositionCorrection, merged, ctx);
}
}
return(new SDS(Generation, pool.ToArray(), merged));
}
private static void MergeInconsistentEntitiesEx(EntityPool pool, SDS source, bool correctLocations, InconsistencyCoverage ic, EntityChange.ExecutionContext ctx)
{
const float searchScope = 0.5f;
foreach (var e0 in source.FinalEntities)
{
if (pool.Contains(e0.ID.Guid))
{
continue; //already good
}
var c0 = ctx.LocalSpace.Relativate(e0.ID.Position);
if (ic.IsInconsistentR(c0))
{
pool.Insert(e0);
}
else
{
if (correctLocations)
{
var c = c0;
if (ic.FindInconsistentPlacementCandidateR(ref c, searchScope))
{
Entity me = e0.Relocate(c);
pool.Insert(me);
}
}
//only increases overaccounted entities:
//if (merged.ic.FindInconsistentPlacementCandidate(c0,searchScope))
//{
// Entity me = *e0;
// me.coordinates = c0 + shardOffset;
// merged.entities.InsertEntity(me);
//}
}
}
}
private static void MergeInconsistentEntitiesComp(EntityPool pool, SDS s0, SDS s1, InconsistencyCoverage ic, EntityChange.ExecutionContext ctx)
{
var a = new EntityPool(s0.FinalEntities, ctx);
var b = new EntityPool(s1.FinalEntities, ctx);
const float searchScope = 0.5f;
foreach (var e0 in a)
{
if (pool.Contains(e0.ID.Guid))
{
continue; //already good
}
//entity is inconsistent and not in merged state yet
var c0 = ctx.LocalSpace.Relativate(e0.ID.Position);
var e1 = b.Find(e0.ID.Guid);
var c1 = e1 != null?ctx.LocalSpace.Relativate(e1.ID.Position) : Vec3.Zero;
if (!ic.IsInconsistentR(c0))
{
//this is tricky. entity not merged, but would reside in consistent space (bad).
if (e1 != null)
{
// ASSERT__(b.ic.IsInconsistent(c1)); //otherwise it would have been added prior, and we would not be here
//so this entity exists in both SDS'
{
//we now have the same entity twice, both inconsistent, residing each in the consistent space of the other SDS'
//let's assume the entity isn't supposed to exist here anyways
Entity candidate = null;
int sc = s0.IC.GetInconsistencyAtR(c0).CompareTo(s1.IC.GetInconsistencyAtR(c1));
if (sc < 0)
{
candidate = e0;
}
else if (sc > 0)
{
candidate = e1;
}
else if (e0.CompareTo(e1) < 0)
{
candidate = e0;
}
else
{
candidate = e1;
}
var c = ctx.LocalSpace.Relativate(candidate.ID.Position);
if (ic.FindInconsistentPlacementCandidateR(ref c, searchScope))
{
Entity me = candidate.Relocate(ctx.LocalSpace.DeRelativate(c));
pool.Insert(me);
}
}
}
else
{
//entity exists only in local SDS.
//let's assume the entity isn't supposed to exist here anyways
//TEntityCoords c = Frac(e0->coordinates);
//if (merged.ic.FindInconsistentPlacementCandidate(c,searchScope))
//{
// Entity copy = *e0;
// copy.coordinates = c + shardOffset;
// //ASSERT__(merged.ic.IsInconsistent(Frac(copy.coordinates)));
// merged.entities.InsertEntity(copy);
//}
//else
// FATAL__("bad");
}
}
else
{
//entity location is inconsistent in both SDS'. This is expected to be the most common case
if (e1 != null)
{
if (e1.Equals(e0))
{
//probably actually consistent
// ASSERT__(merged.ic.IsInconsistent(Frac(e0->coordinates)));
pool.Insert(e0);
}
else
{
if (!ic.IsInconsistentR(c1))
{
Debug.Assert(ic.IsInconsistentR(c0));
pool.Insert(e0);
}
else
{
Entity candidate = null;
int sc = s0.IC.GetInconsistencyAtR(c0).CompareTo(s1.IC.GetInconsistencyAtR(c1));
if (sc < 0)
{
candidate = e0;
}
else if (sc > 0)
{
candidate = e1;
}
else if (e0.CompareTo(e1) < 0)
{
candidate = e0;
}
else
{
candidate = e1;
}
//common case. Choose one
//ASSERT__(ic.IsInconsistentR(candidate->coordinates-shardOffset));
pool.Insert(candidate);
}
}
}
else
{
//only e0 exists
int sc = s0.IC.GetInconsistencyAtR(c0).CompareTo(s1.IC.GetInconsistencyAtR(c0));
//ASSERT__(merged.ic.IsInconsistent(Frac(e0->coordinates)));
if (sc <= 0)
{
pool.Insert(e0);
}
}
}
}
foreach (var e0 in b)
{
if (pool.Contains(e0.ID.Guid))
{
continue; //already good
}
//entity is inconsistent and not in merged state yet
var c0 = ctx.LocalSpace.Relativate(e0.ID.Position);
//const auto c1 = e1 ? (e1->coordinates - shardOffset) : TEntityCoords();
if (!ic.IsInconsistentR(c0))
{
#if false
//this is tricky. entity not merged, but would reside in consistent space (bad).
if (e1)
{
//case handled
//FATAL__("bad");
}
else
{
//entity exists only in local SDS.
//let's assume the entity isn't supposed to exist here anyways
//TEntityCoords c = Frac(e0->coordinates);
//if (merged.ic.FindInconsistentPlacementCandidate(c,searchScope))
//{
// Entity copy = *e0;
// copy.coordinates = c + shardOffset;
// //ASSERT__(merged.ic.IsInconsistent(Frac(copy.coordinates)));
// merged.entities.InsertEntity(copy);
//}
/* else
* FATAL__("bad");*/
}
#endif
}
else
{
var e1 = a.Find(e0.ID.Guid);
//entity location is inconsistent in both SDS'. This is expected to be the most common case
if (e1 != null)
{
//case handled
//FATAL__("bad");
}
else
{
//only e0 exists
int sc = s0.IC.GetInconsistencyAtR(c0).CompareTo(s1.IC.GetInconsistencyAtR(c0));
//ASSERT__(merged.ic.IsInconsistent(Frac(e0->coordinates)));
if (sc >= 0)
{
pool.Insert(e0);
}
}
}
}
}