GhostEngine/Ghost.Entities/Templates/EntityQuery.JobEntity.tt

<#@ template language="C#" #>
<#@ output extension="gen.cs" #>
<#@ assembly name="System.Core" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Text" #>
<#@ include file="Helpers.ttinclude" #>
using Ghost.Core;
using Misaki.HighPerformance.Jobs;
using Misaki.HighPerformance.LowLevel.Collections;

namespace Ghost.Entities;

<# for (var i = 1; i <= Amount; i++)
{
    var generics = AppendGenerics(i);
    var restrictions = AppendGenericRestrictionsMultiline(i, "unmanaged, IComponent", 1);
#>
public interface IJobEntity<<#= generics #>>
<#= restrictions #>
{
    void Execute(Entity entity, <#= AppendParameters(i, "ref T{0} component{0}") #>, int threadIndex);
}

internal unsafe struct JobEntityBatch<TJob, <#= generics #>> : IJobParallelFor
    where TJob : unmanaged, IJobEntity<<#= generics #>>
<#= restrictions #>
{
    public fixed int componentIDs[<#= i #>];
    public fixed bool componentRW[<#= i #>];

    public TJob userJob;

    public UnsafeList<IntPtr> chunks;
    public UnsafeList<IntPtr> chunkVersions;
    public UnsafeList<int> chunkCount;
    public UnsafeList<int> entityOffset;

<# for (var j = 0; j < i; j++){ #>
    public UnsafeList<int> offsets<#= j #>;
    public UnsafeList<int> bitsOffsets<#= j #>;
    public UnsafeList<int> versionindices<#= j #>;

<# } #>
    public int version;

    public void Execute(int loopIndex, int threadIndex)
    {
        // 1. Get the specific pChunk for this thread
        var pChunk = (byte*)chunks[loopIndex];
        var pVersions = (int*)chunkVersions[loopIndex];
        var count = chunkCount[loopIndex];

<# for (var j = 0; j < i; j++){ #>
        var off<#= j #> = offsets<#= j #>[loopIndex];
        var enableOff<#= j #> = bitsOffsets<#= j #>[loopIndex];
        var versionIndex<#= j #> = versionindices<#= j #>[loopIndex];

<# } #>
        var pEntity = (Entity*)(pChunk + entityOffset[loopIndex]);
<# for (var j = 0; j < i; j++){ #>
        var ptr<#= j #> = (<#= "T" + j #>*)(pChunk + off<#= j #>);
<# } #>

        // 2. Update versions for RW components
<# for (var j = 0; j < i; j++){ #>
        if (componentRW[<#= j #>])
        {
            pVersions[versionIndex<#= j #>] = version;
        }

<# } #>
        // 3. Iterate all entities in this chunk
        for (var i = 0; i < count; i++)
        {
<# for (var j = 0; j < i; j++){ #>
            if (enableOff<#= j #> != -1 && !EntityQuery.CheckBit(pChunk + enableOff<#= j #>, i))
            {
                continue;
            }

<# } #>
            userJob.Execute(pEntity[i], <#= AppendParameters(i, "ref ptr{0}[i]") #>, threadIndex);
        }
    }
}

<# } #>
public unsafe partial struct EntityQuery
{
<# for (var i = 1; i <= Amount; i++)
{
    var generics = AppendGenerics(i);
    var restrictions = AppendGenericRestrictionsMultiline(i, "unmanaged, IComponent", 2);
#>
    private struct DisposeJobEntity<#= i #> : IJob
    {
        public UnsafeList<IntPtr> chunks;
        public UnsafeList<IntPtr> chunkVersions;
        public UnsafeList<int> chunkEntityCounts;
        public UnsafeList<int> entityOffsets;

<# for (var j = 0; j < i; j++){ #>
        public UnsafeList<int> offsets<#= j #>;
        public UnsafeList<int> bitsOffsets<#= j #>;
        public UnsafeList<int> versionindices<#= j #>;

<# } #>
        public void Execute(int threadIndex)
        {
            chunks.Dispose();
            chunkVersions.Dispose();
            chunkEntityCounts.Dispose();
            entityOffsets.Dispose();

<# for (var j = 0; j < i; j++){ #>
            offsets<#= j #>.Dispose();
            bitsOffsets<#= j #>.Dispose();
            versionindices<#= j #>.Dispose();

<# } #>
        }
    }

    public JobHandle ScheduleEntityParallel<TJob, <#= generics #>>(TJob jobData, int batchSize, JobHandle dependency)
        where TJob : unmanaged, IJobEntity<<#= generics #>>
<#= restrictions #>
    {
        var world = World.GetWorld(_worldID);
        if (world is null)
        {
            return JobHandle.Invalid;
        }

        if (world.JobScheduler == null)
        {
            throw new InvalidOperationException("The World has no JobScheduler assigned.");
        }

        // 1. Flatten the World
        var chunks = new UnsafeList<IntPtr>(128, JobScheduler.TempAllocatorHandle);
        var chunkVersions = new UnsafeList<IntPtr>(128, JobScheduler.TempAllocatorHandle);
        var chunkEntityCounts = new UnsafeList<int>(128, JobScheduler.TempAllocatorHandle);
        var entityOffsets = new UnsafeList<int>(128, JobScheduler.TempAllocatorHandle);

<# for (var j = 0; j < i; j++){ #>
        var offsets<#= j #> = new UnsafeList<int>(128, JobScheduler.TempAllocatorHandle);
        var bitsOffsets<#= j #> = new UnsafeList<int>(128, JobScheduler.TempAllocatorHandle);
        var versionIndices<#= j #> = new UnsafeList<int>(128, JobScheduler.TempAllocatorHandle);

<# } #>
        // Iterate the Query's matching archetypes
        foreach (var archID in _matchingArchetypes)
        {
            ref var arch = ref world.ComponentManager.GetArchetypeReference(archID);

            if (arch.ChunkCount == 0)
            {
                continue;
            }

            // Get offsets ONCE per archetype
<# for (var j = 0; j < i; j++){ #>
            var layout<#= j #> = arch.GetLayout(ComponentTypeID<T<#= j #>>.Value)
                .GetValueOrThrow();
<# } #>

            // Add all chunks from this archetype
            for (var i = 0; i < arch.ChunkCount; i++)
            {
                ref var chunkRef = ref arch.GetChunkReference(i);

                chunks.Add((IntPtr)chunkRef.GetUnsafePtr());
                chunkVersions.Add((IntPtr)chunkRef.GetVersionUnsafePtr());
                chunkEntityCounts.Add(chunkRef._count);
                entityOffsets.Add(arch.EntityIDsOffset);

<# for (var j = 0; j < i; j++){ #>
                offsets<#= j #>.Add(layout<#= j #>.offset);
                bitsOffsets<#= j #>.Add(layout<#= j #>.enableBitsOffset);
                versionIndices<#= j #>.Add(layout<#= j #>.versionIndex);

<# } #>
            }
        }

        // 2. Create the Runner
        var runner = new JobEntityBatch<TJob, <#= generics #>>
        {
            userJob = jobData,
            chunks = chunks,
            chunkVersions = chunkVersions,
            chunkCount = chunkEntityCounts,
            entityOffset = entityOffsets,

<# for (var j = 0; j < i; j++){ #>
            offsets<#= j #> = offsets<#= j #>,
            bitsOffsets<#= j #> = bitsOffsets<#= j #>,
            versionindices<#= j #> = versionIndices<#= j #>,

<# } #>
            version = world.Version,
        };

        runner.componentIDs[0] = ComponentTypeID<T0>.Value;

        var it = _mask.writeAccess.GetIterator();
        while (it.Next(out var id))
        {
            for (var i =0; i < 1; i++)
            {
                if (id == runner.componentIDs[i])
                {
                    runner.componentRW[i] = true;
                    break;
                }
            }
        }

        var jobHandle = world.JobScheduler.ScheduleParallel(ref runner, chunks.Count, batchSize, dependency);

        // 3. Dispose the temp lists
        var disposeJob = new DisposeJobEntity<#= i #>
        {
            chunks = chunks,
            chunkVersions = chunkVersions,
            chunkEntityCounts = chunkEntityCounts,
            entityOffsets = entityOffsets,

<# for (var j = 0; j < i; j++){ #>
            offsets<#= j #> = offsets<#= j #>,
            bitsOffsets<#= j #> = bitsOffsets<#= j #>,
            versionindices<#= j #> = versionIndices<#= j #>,

<# } #>
        };

        world.JobScheduler.Schedule(ref disposeJob, jobHandle);

        return jobHandle;
    }

<# } #>
}