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MoonWorks
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add collision mask system to spatial hash

pull/18/head
cosmonaut 2022-03-25 15:11:38 -07:00
parent 6ea3e24a91
commit f0d3dfccf9
1 changed files with 10 additions and 9 deletions
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19
src/Collision/SpatialHash2D.cs
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@ -12,7 +12,7 @@ namespace MoonWorks.Collision
private readonly int cellSize; private readonly int cellSize;
private readonly Dictionary<long, HashSet<T>> hashDictionary = new Dictionary<long, HashSet<T>>(); private readonly Dictionary<long, HashSet<T>> hashDictionary = new Dictionary<long, HashSet<T>>();
private readonly Dictionary<T, (IHasAABB2D, Transform2D)> IDLookup = new Dictionary<T, (IHasAABB2D, Transform2D)>(); private readonly Dictionary<T, (IHasAABB2D, Transform2D, uint)> IDLookup = new Dictionary<T, (IHasAABB2D, Transform2D, uint)>();
public int MinX { get; private set; } = 0; public int MinX { get; private set; } = 0;
public int MaxX { get; private set; } = 0; public int MaxX { get; private set; } = 0;
@ -37,7 +37,8 @@ namespace MoonWorks.Collision
/// <param name="id">A unique ID for the shape-transform pair.</param> /// <param name="id">A unique ID for the shape-transform pair.</param>
/// <param name="shape"></param> /// <param name="shape"></param>
/// <param name="transform2D"></param> /// <param name="transform2D"></param>
public void Insert(T id, IHasAABB2D shape, Transform2D transform2D) /// <param name="collisionGroups">A bitmask value specifying the groups this object belongs to.</param>
public void Insert(T id, IHasAABB2D shape, Transform2D transform2D, uint collisionGroups = uint.MaxValue)
{ {
var box = shape.TransformedAABB(transform2D); var box = shape.TransformedAABB(transform2D);
var minHash = Hash(box.Min); var minHash = Hash(box.Min);
@ -54,7 +55,7 @@ namespace MoonWorks.Collision
} }
hashDictionary[key].Add(id); hashDictionary[key].Add(id);
IDLookup[id] = (shape, transform2D); IDLookup[id] = (shape, transform2D, collisionGroups);
} }
} }
@ -67,7 +68,7 @@ namespace MoonWorks.Collision
/// <summary> /// <summary>
/// Retrieves all the potential collisions of a shape-transform pair. Excludes any shape-transforms with the given ID. /// Retrieves all the potential collisions of a shape-transform pair. Excludes any shape-transforms with the given ID.
/// </summary> /// </summary>
public IEnumerable<(T, IHasAABB2D, Transform2D)> Retrieve(T id, IHasAABB2D shape, Transform2D transform2D) public IEnumerable<(T, IHasAABB2D, Transform2D)> Retrieve(T id, IHasAABB2D shape, Transform2D transform2D, uint collisionMask = uint.MaxValue)
{ {
var returned = AcquireHashSet(); var returned = AcquireHashSet();
@ -91,8 +92,8 @@ namespace MoonWorks.Collision
{ {
if (!returned.Contains(t)) if (!returned.Contains(t))
{ {
var (otherShape, otherTransform) = IDLookup[t]; var (otherShape, otherTransform, collisionGroups) = IDLookup[t];
if (!id.Equals(t) && AABB2D.TestOverlap(box, otherShape.TransformedAABB(otherTransform))) if (!id.Equals(t) && ((collisionGroups & collisionMask) > 0) && AABB2D.TestOverlap(box, otherShape.TransformedAABB(otherTransform)))
{ {
returned.Add(t); returned.Add(t);
yield return (t, otherShape, otherTransform); yield return (t, otherShape, otherTransform);
@ -112,7 +113,7 @@ namespace MoonWorks.Collision
/// </summary> /// </summary>
/// <param name="aabb">A transformed AABB.</param> /// <param name="aabb">A transformed AABB.</param>
/// <returns></returns> /// <returns></returns>
public IEnumerable<(T, IHasAABB2D, Transform2D)> Retrieve(AABB2D aabb) public IEnumerable<(T, IHasAABB2D, Transform2D)> Retrieve(AABB2D aabb, uint collisionMask = uint.MaxValue)
{ {
var returned = AcquireHashSet(); var returned = AcquireHashSet();
@ -135,8 +136,8 @@ namespace MoonWorks.Collision
{ {
if (!returned.Contains(t)) if (!returned.Contains(t))
{ {
var (otherShape, otherTransform) = IDLookup[t]; var (otherShape, otherTransform, collisionGroups) = IDLookup[t];
if (AABB2D.TestOverlap(aabb, otherShape.TransformedAABB(otherTransform))) if (((collisionGroups & collisionMask) > 0) && AABB2D.TestOverlap(aabb, otherShape.TransformedAABB(otherTransform)))
{ {
yield return (t, otherShape, otherTransform); yield return (t, otherShape, otherTransform);
} }