カウンター付きの ComputeBuffer
Adds a "counter" to a RWStructuredBuffer and allows using IncrementCounter / DecrementCounter HLSL functions on it.
The stride passed when constructing the buffer must match structure size, be a multiple of 4 and less than 2048.
See Microsoft's HLSL documentation on IncrementCounter and DecrementCounter.
The buffer size value can be copied into another buffer using ComputeBuffer.CopyCount, or explicitly reset with ComputeBuffer.SetCounterValue.
Additional resources: ComputeBuffer, ComputeShader, Material.SetBuffer.