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Example of a grid system built with with ISystemStateComponentData
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// src: https://gist.github.com/andrew-raphael-lukasik/19170443b976582f97404f6da9875b4c | |
using UnityEngine; | |
using Unity.Entities; | |
using Unity.Mathematics; | |
using Unity.Collections; | |
using Unity.Jobs; | |
namespace Sandbox | |
{ | |
public class Planted : MonoBehaviour | |
{ | |
[SerializeField] int _numPlantsOnStart = 5; | |
[SerializeField] int2 _coordMinOnStart = -10, _coordMaxnOnStart = 10; | |
EntityManager _entityManager; | |
EntityQuery _query; | |
void Start () | |
{ | |
var world = World.DefaultGameObjectInjectionWorld; | |
_entityManager = world.EntityManager; | |
_query = _entityManager.CreateEntityQuery( ComponentType.ReadOnly<Coord>() , ComponentType.ReadOnly<Spread>() , ComponentType.ReadOnly<Gene>() ); | |
var prefabs = world.GetOrCreateSystem<PrefabSystem>(); | |
var rnd = new Unity.Mathematics.Random( (uint) System.DateTime.Now.GetHashCode() ); | |
for( int i=0 ; i<_numPlantsOnStart ; i++ ) | |
{ | |
Entity plantInstance = _entityManager.Instantiate( prefabs.Plant ); | |
_entityManager.SetComponentData( plantInstance , new Coord{ | |
Value = rnd.NextInt2( _coordMinOnStart , _coordMaxnOnStart ) | |
} ); | |
_entityManager.SetComponentData( plantInstance , new Age{ | |
Value = rnd.NextFloat( 0f , rnd.NextFloat(Age.limit*0.1f) ) | |
} ); | |
var genes = _entityManager.GetBuffer<Gene>( plantInstance ); | |
Color32 colorBytes = Color.HSVToRGB( rnd.NextFloat(1f) , 1f , 1f ); | |
genes.Add( colorBytes.r ); | |
genes.Add( colorBytes.g ); | |
genes.Add( colorBytes.b ); | |
} | |
} | |
#if UNITY_EDITOR | |
void OnDrawGizmos () | |
{ | |
if( !Application.isPlaying ) return; | |
int len = _query.CalculateEntityCount(); | |
var entities = _query.ToEntityArray(Allocator.Temp).ToArray(); | |
var coords = _query.ToComponentDataArray<Coord>(Allocator.Temp).ToArray(); | |
for( int i=0 ; i<len ; i++ ) | |
{ | |
var genes = _entityManager.GetBuffer<Gene>( entities[i] ); | |
Gizmos.color = new Color32( genes[0] , genes[1] , genes[2] , 255 ); | |
int2 coord = coords[i].Value; | |
Gizmos.DrawSphere( new Vector3( coord.x , coord.y , 0 ) , 0.5f ); | |
} | |
} | |
#endif | |
} | |
public struct Coord : IComponentData | |
{ | |
public int2 Value; | |
} | |
public struct Age : IComponentData | |
{ | |
public float Value; | |
public const float limit = 10f; | |
} | |
public struct Spread : IComponentData | |
{ | |
public float Value; | |
public const float spread_threshold = 2f; | |
} | |
[InternalBufferCapacity(5)] | |
public struct Gene : IBufferElementData | |
{ | |
public byte Value; | |
public static implicit operator byte ( Gene value ) => value.Value; | |
public static implicit operator Gene ( byte value ) => new Gene{ Value=value }; | |
} | |
[UpdateInGroup( typeof(SimulationSystemGroup) )] | |
public partial class SpreadSystem : SystemBase | |
{ | |
EntityCommandBufferSystem _ecbSystem; | |
GridSystem _gridSystem; | |
PrefabSystem _prefabs; | |
protected override void OnCreate () | |
{ | |
base.OnCreate(); | |
_ecbSystem = World.GetOrCreateSystem<EndSimulationEntityCommandBufferSystem>(); | |
_gridSystem = World.GetOrCreateSystem<GridSystem>(); | |
_prefabs = World.GetOrCreateSystem<PrefabSystem>(); | |
} | |
protected override void OnUpdate () | |
{ | |
float deltaTime = Time.DeltaTime; | |
uint rndHash = (uint) Time.ElapsedTime.GetHashCode(); | |
var grid = _gridSystem.Lookup; | |
var plantPrefab = _prefabs.Plant; | |
var geneBuffers = GetBufferFromEntity<Gene>( isReadOnly:false ); | |
var cmd = _ecbSystem.CreateCommandBuffer().AsParallelWriter(); | |
this.Dependency = JobHandle.CombineDependencies( Dependency , _gridSystem.LookupDependency ); | |
Entities | |
.WithReadOnly( grid ) | |
.WithAll<Gene>() | |
.ForEach( ( ref Spread spread , in Coord coord , in Entity e , in int nativeThreadIndex ) => | |
{ | |
spread.Value += deltaTime; | |
if( spread.Value>Spread.spread_threshold ) | |
{ | |
var rnd = new Unity.Mathematics.Random( rndHash + (uint)e.GetHashCode() + (uint)nativeThreadIndex.GetHashCode() ); | |
var myGenes = geneBuffers[e]; | |
int2 spreadAttemptCoord = coord.Value + rnd.NextInt2( -2 , 2 ); | |
if( !grid.ContainsKey(spreadAttemptCoord) )// is this spot free | |
{ | |
var newPlant = cmd.Instantiate( nativeThreadIndex , plantPrefab ); | |
cmd.SetComponent( nativeThreadIndex , newPlant , new Coord{ Value=spreadAttemptCoord } ); | |
cmd.SetComponent( nativeThreadIndex , newPlant , new Spread{ Value=rnd.NextFloat(0f,Spread.spread_threshold*0.5f) } ); | |
cmd.SetComponent( nativeThreadIndex , newPlant , new Age{ Value=rnd.NextFloat(0f,Age.limit*0.1f) } ); | |
// propagate genes with slight mutation: | |
const byte mutation_range_half = 30; | |
cmd.AppendToBuffer<Gene>( nativeThreadIndex , newPlant , (byte)math.clamp( myGenes[0] + rnd.NextInt(-mutation_range_half,mutation_range_half+1) , 0 , 255 ) ); | |
cmd.AppendToBuffer<Gene>( nativeThreadIndex , newPlant , (byte)math.clamp( myGenes[1] + rnd.NextInt(-mutation_range_half,mutation_range_half+1) , 0 , 255 ) ); | |
cmd.AppendToBuffer<Gene>( nativeThreadIndex , newPlant , (byte)math.clamp( myGenes[2] + rnd.NextInt(-mutation_range_half,mutation_range_half+1) , 0 , 255 ) ); | |
} | |
else// it's taken so lets attempt cross-pollination | |
{ | |
foreach( var other in grid.GetValuesForKey(spreadAttemptCoord) ) | |
if( geneBuffers.HasComponent(other) ) | |
{ | |
var otherGenes = geneBuffers[other]; | |
otherGenes[0] = rnd.NextBool() ? otherGenes[0] : myGenes[0]; | |
otherGenes[1] = rnd.NextBool() ? otherGenes[1] : myGenes[1]; | |
otherGenes[2] = rnd.NextBool() ? otherGenes[2] : myGenes[2]; | |
} | |
} | |
spread.Value = 0; | |
} | |
} ) | |
.WithBurst() | |
.Schedule(); | |
_ecbSystem.AddJobHandleForProducer( Dependency ); | |
} | |
} | |
[UpdateInGroup( typeof(SimulationSystemGroup) )] | |
public partial class AgeSystem : SystemBase | |
{ | |
EntityCommandBufferSystem _ecbSystem; | |
protected override void OnCreate () | |
{ | |
base.OnCreate(); | |
_ecbSystem = World.GetOrCreateSystem<EndSimulationEntityCommandBufferSystem>(); | |
} | |
protected override void OnUpdate () | |
{ | |
float deltaTime = Time.DeltaTime; | |
var cmd = _ecbSystem.CreateCommandBuffer().AsParallelWriter(); | |
Entities | |
.ForEach( ( ref Age age , in Entity e , in int nativeThreadIndex ) => | |
{ | |
age.Value += deltaTime; | |
if( age.Value>Age.limit ) | |
cmd.DestroyEntity( nativeThreadIndex , e ); | |
} ) | |
.WithBurst() | |
.ScheduleParallel(); | |
_ecbSystem.AddJobHandleForProducer( Dependency ); | |
} | |
} | |
[UpdateInGroup( typeof(SimulationSystemGroup) , OrderFirst=true )] | |
public partial class GridSystem : SystemBase | |
{ | |
/// <summary> Read-Only </summary> | |
public NativeMultiHashMap<int2,Entity> Lookup { get; private set; } | |
public JobHandle LookupDependency => base.Dependency; | |
EntityCommandBufferSystem _ecbSystem; | |
EntityQuery _queryNew; | |
protected override void OnCreate () | |
{ | |
base.OnCreate(); | |
_ecbSystem = World.GetOrCreateSystem<EndSimulationEntityCommandBufferSystem>(); | |
_queryNew = EntityManager.CreateEntityQuery( new EntityQueryDesc{ | |
None = new ComponentType[]{ ComponentType.ReadOnly<Tracked>() } , | |
All = new ComponentType[]{ ComponentType.ReadOnly<Coord>() } | |
} ); | |
Lookup = new NativeMultiHashMap<int2,Entity>( 1024 , Allocator.Persistent ); | |
} | |
protected override void OnDestroy () | |
{ | |
base.OnDestroy(); | |
Lookup.Dispose(); | |
} | |
protected override void OnUpdate () | |
{ | |
var cmd = _ecbSystem.CreateCommandBuffer().AsParallelWriter(); | |
var lookup = Lookup; | |
var lookupPW = Lookup.AsParallelWriter(); | |
int countNewToLookup = _queryNew.CalculateEntityCount(); | |
if( countNewToLookup!=0 && (lookup.Count()+countNewToLookup)>lookup.Capacity/2 ) | |
{ | |
lookup.Capacity = Mathf.Max( lookup.Count()+countNewToLookup , lookup.Capacity*2 ); | |
Debug.Log($"{nameof(GridSystem)}.{nameof(Lookup)} capacity increased to {lookup.Capacity}"); | |
} | |
Entities | |
.WithName("coord_created_job") | |
.WithNone<Tracked>() | |
.ForEach( ( in Coord coord , in Entity e , in int nativeThreadIndex ) => | |
{ | |
lookupPW.Add( coord.Value , e ); | |
cmd.AddComponent<Tracked>( nativeThreadIndex , e , new Tracked{ Value=coord.Value } ); | |
} ) | |
.WithBurst() | |
.ScheduleParallel(); | |
Entities | |
.WithName("coord_destroyed_job") | |
.WithNone<Coord>() | |
.ForEach( ( in Tracked tracked , in Entity e , in int nativeThreadIndex ) => | |
{ | |
lookup.Remove( tracked.Value , e ); | |
cmd.RemoveComponent<Tracked>( nativeThreadIndex , e ); | |
} ) | |
.WithBurst() | |
.Schedule(); | |
_ecbSystem.AddJobHandleForProducer( Dependency ); | |
} | |
struct Tracked : ISystemStateComponentData { public int2 Value; } | |
} | |
[DisableAutoCreation] | |
[UpdateInGroup( typeof(InitializationSystemGroup) )] | |
public partial class PrefabSystem : SystemBase | |
{ | |
public Entity Plant { get; private set; } | |
protected override void OnCreate () | |
{ | |
base.OnCreate(); | |
this.Enabled = false; | |
Plant = EntityManager.CreateEntity( typeof(Prefab) , typeof(Coord) , typeof(Age) , typeof(Spread) , typeof(Gene) ); | |
} | |
protected override void OnUpdate () {} | |
} | |
} |
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