when using Dynamic Buffers(ECS), How can you add two variables

Questions & Answers
1

Hello,I have been trying to write an inventory system with Dynamic Buffers with ECS. I want to know if it is more performant to have 150 items(all with an id) as the InternalBufferCapacity or have 8 as the InternalBufferCapacity with an id and an amount. 8 as the InternalBufferCapacity would mean you need two integers in the buffer. Can You Even do that? Here is my Dynamic Buffer

[InternalBufferCapacity(150)]
[GenerateAuthoringComponent]
public struct InventoryBufferData : IBufferElementData
{
    int id;
}
2 
[InternalBufferCapacity(150)]
public struct InventoryBufferData : IBufferElementData
{
    public int ID;
}

will allocate 600B / Entity:

{int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int,int}

[InternalBufferCapacity(8)]
public struct InventoryBufferData : IBufferElementData
{
    public int ID;
    public uint Amount;
}

will allocate 64B / Entity

{int,uint,int,uint,int,uint,int,uint,int,uint,int,uint,int,uint,int,uint}

Lower memory footprint won’t correlate with increased performance necessarily, but it is a very reasonable default until more factors is known.

3

well, what if I used an IcomponentData instead and had 4 slots with an id and an amount and did it that way instead.

[GenerateAuthoringComponent]
public struct InventoryData : IComponentData
{
    public int Id1;
    public int Amount1;

    public int Id2;
    public int Amount2;

    public int Id3;
    public int Amount3;
}