GraphicsBuffer with an internal counter.
将一个“计数器”添加到 RWStructuredBuffer，并且允许对其使用 IncrementCounter / DecrementCounter HLSL 函数。
When you construct a GraphicsBuffer of this type, the value of stride must match the stride of the corresponding StructuredBuffer struct type in your HLSL code. It must also 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 GraphicsBuffer.CopyCount, or explicitly reset with GraphicsBuffer.SetCounterValue.
See Also: GraphicsBuffer.SetCounterValue, GraphicsBuffer.CopyCount.