using System;
using System.Collections.Concurrent;

namespace MoonWorks.Graphics
{
	internal class CommandBufferPool
	{
		private GraphicsDevice GraphicsDevice;
		private ConcurrentQueue<CommandBuffer> CommandBuffers = new ConcurrentQueue<CommandBuffer>();

		public CommandBufferPool(GraphicsDevice graphicsDevice)
		{
			GraphicsDevice = graphicsDevice;
		}

		public CommandBuffer Obtain()
		{
			if (CommandBuffers.TryDequeue(out var commandBuffer))
			{
				return commandBuffer;
			}
			else
			{
				return new CommandBuffer(GraphicsDevice);
			}
		}

		public void Return(CommandBuffer commandBuffer)
		{
			commandBuffer.Handle = IntPtr.Zero;
			CommandBuffers.Enqueue(commandBuffer);
		}
	}
}