MoonWorksMultiWindowTest/src/MoonWorksMultiWindowGame.cs

using MoonWorks.Graphics;
using MoonWorks;
using System.Threading.Tasks;

namespace MoonWorksMultiWindow
{
	class MoonWorksMultiWindowGame : Game
	{
		private Window ExtraWindow { get; }

		public MoonWorksMultiWindowGame(
			WindowCreateInfo windowCreateInfo,
			PresentMode presentMode,
			bool debugMode
		) : base(windowCreateInfo, presentMode, 60, debugMode)
		{
			var extraWindowCreateInfo = new WindowCreateInfo
			{
				WindowTitle = "Extra Window",
				WindowWidth = 1280,
				WindowHeight = 720,
				ScreenMode = ScreenMode.Windowed
			};

			ExtraWindow = new Window(extraWindowCreateInfo);
		}

		protected override void Update(System.TimeSpan dt)
		{
			if (Inputs.Keyboard.IsPressed(MoonWorks.Input.Keycode.Up))
			{
				Window.SetWindowSize(Window.Width + 50, Window.Height + 50);
			}

			if (Inputs.Keyboard.IsPressed(MoonWorks.Input.Keycode.Down))
			{
				Window.SetWindowSize(Window.Width - 50, Window.Height - 50);
			}

			if (Inputs.Keyboard.IsPressed(MoonWorks.Input.Keycode.Right))
			{
				ExtraWindow.SetWindowSize(ExtraWindow.Width + 50, ExtraWindow.Height + 50);
			}

			if (Inputs.Keyboard.IsPressed(MoonWorks.Input.Keycode.Left))
			{
				ExtraWindow.SetWindowSize(ExtraWindow.Width - 50, ExtraWindow.Height - 50);
			}
		}

		protected override void Draw(System.TimeSpan dt, double alpha)
		{
			var mainDraw = Task.Run(MainDraw);
			var extraDraw = Task.Run(ExtraWindowDraw);

			mainDraw.Wait();
			extraDraw.Wait();
		}

		private void MainDraw()
		{
			var commandBuffer = GraphicsDevice.AcquireCommandBuffer();
			var swapchainTexture = commandBuffer.AcquireSwapchainTexture(Window);

			if (swapchainTexture != null)
			{
				commandBuffer.BeginRenderPass(
					new ColorAttachmentInfo(
						swapchainTexture, Color.CornflowerBlue
					)
				);

				commandBuffer.EndRenderPass();
			}

			GraphicsDevice.Submit(commandBuffer);
		}

		private void ExtraWindowDraw()
		{
			var commandBuffer = GraphicsDevice.AcquireCommandBuffer();
			var swapchainTexture = commandBuffer.AcquireSwapchainTexture(ExtraWindow);

			if (swapchainTexture != null)
			{
				commandBuffer.BeginRenderPass(
					new ColorAttachmentInfo(
						swapchainTexture, Color.OrangeRed
					)
				);

				commandBuffer.EndRenderPass();
			}

			GraphicsDevice.Submit(commandBuffer);
		}

		protected override void OnDestroy()
		{

		}
	}
}