private void OnGridFixtureChange(GridFixtureChangeEvent args)
{
// Look this is jank but it's a placeholder until we design it.
if (args.NewFixtures.Count == 0)
{
return;
}
var manager = Comp <FixturesComponent>(args.NewFixtures[0].Body.Owner);
foreach (var fixture in args.NewFixtures)
{
_fixtures.SetMass(fixture, fixture.Area * TileMassMultiplier, manager, false);
_fixtures.SetRestitution(fixture, 0.1f, manager, false);
}
_fixtures.FixtureUpdate(manager, args.NewFixtures[0].Body);
}
public void AddCollisionMask(FixturesComponent component, Fixture fixture, int mask)
{
if ((fixture.CollisionMask & mask) == mask)
{
return;
}
DebugTools.Assert(component.Fixtures.ContainsKey(fixture.ID));
fixture._collisionMask |= mask;
if (TryComp <PhysicsComponent>(component.Owner, out var body))
{
_fixtures.FixtureUpdate(component, body);
}
_broadphaseSystem.Refilter(fixture);
}
internal void RegenerateCollision(EntityUid gridEuid, MapChunk chunk, List <Box2i> rectangles)
{
if (!_enabled)
{
return;
}
DebugTools.Assert(chunk.FilledTiles > 0);
if (!EntityManager.TryGetComponent(gridEuid, out PhysicsComponent? physicsComponent))
{
Logger.ErrorS("physics", $"Trying to regenerate collision for {gridEuid} that doesn't have {nameof(physicsComponent)}");
return;
}
if (!EntityManager.TryGetComponent(gridEuid, out FixturesComponent? fixturesComponent))
{
Logger.ErrorS("physics", $"Trying to regenerate collision for {gridEuid} that doesn't have {nameof(fixturesComponent)}");
return;
}
var origin = chunk.Indices * chunk.ChunkSize;
// So we store a reference to the fixture on the chunk because it's easier to cross-reference it.
// This is because when we get multiple fixtures per chunk there's no easy way to tell which the old one
// corresponds with.
// We also ideally want to avoid re-creating the fixture every time a tile changes and pushing that data
// to the client hence we diff it.
// Additionally, we need to handle map deserialization where content may have stored its own data
// on the grid (e.g. mass) which we want to preserve.
var newFixtures = new List <Fixture>();
Span <Vector2> vertices = stackalloc Vector2[4];
foreach (var rectangle in rectangles)
{
var bounds = ((Box2)rectangle.Translated(origin)).Enlarged(_fixtureEnlargement);
var poly = new PolygonShape();
vertices[0] = bounds.BottomLeft;
vertices[1] = bounds.BottomRight;
vertices[2] = bounds.TopRight;
vertices[3] = bounds.TopLeft;
poly.SetVertices(vertices);
var newFixture = new Fixture(
poly,
MapGridHelpers.CollisionGroup,
MapGridHelpers.CollisionGroup,
true)
{
ID = $"grid_chunk-{bounds.Left}-{bounds.Bottom}",
Body = physicsComponent
};
newFixtures.Add(newFixture);
}
var toRemove = new RemQueue <Fixture>();
// Check if we even need to issue an eventbus event
var updated = false;
foreach (var oldFixture in chunk.Fixtures)
{
var existing = false;
// Handle deleted / updated fixtures
// (TODO: Check IDs and cross-reference for updates?)
for (var i = newFixtures.Count - 1; i >= 0; i--)
{
var fixture = newFixtures[i];
if (!oldFixture.Equals(fixture))
{
continue;
}
existing = true;
newFixtures.RemoveSwap(i);
break;
}
// Doesn't align with any new fixtures so delete
if (existing)
{
continue;
}
toRemove.Add(oldFixture);
}
foreach (var fixture in toRemove)
{
chunk.Fixtures.Remove(fixture);
_fixtures.DestroyFixture(fixture, false, fixturesComponent);
}
if (newFixtures.Count > 0 || toRemove.List?.Count > 0)
{
updated = true;
}
// Anything remaining is a new fixture (or at least, may have not serialized onto the chunk yet).
foreach (var fixture in newFixtures)
{
var existingFixture = _fixtures.GetFixtureOrNull(physicsComponent, fixture.ID);
// Check if it's the same (otherwise remove anyway).
if (existingFixture?.Shape is PolygonShape poly &&
poly.EqualsApprox((PolygonShape)fixture.Shape))
{
chunk.Fixtures.Add(existingFixture);
continue;
}
chunk.Fixtures.Add(fixture);
_fixtures.CreateFixture(physicsComponent, fixture, false, fixturesComponent);
}
if (updated)
{
_fixtures.FixtureUpdate(fixturesComponent, physicsComponent);
EntityManager.EventBus.RaiseLocalEvent(gridEuid, new GridFixtureChangeEvent {
NewFixtures = chunk.Fixtures
});
}
}