MoonWorksMultiWindowTest/src/MoonWorksMultiWindowGame.cs

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

namespace MoonWorksMultiWindow
{
    class MoonWorksMultiWindowGame : Game
    {
        private GraphicsObjects GraphicsObjects { get; }

        private int RenderWidth { get; }
        private int RenderHeight { get; }

		private OSWindow ExtraWindow { get; }

        public MoonWorksMultiWindowGame(
            WindowCreateInfo windowCreateInfo,
            PresentMode presentMode,
            bool debugMode
        ) : base(windowCreateInfo, presentMode, 60, debugMode)
        {
            // Insert your game initialization logic here.
            GraphicsObjects = new GraphicsObjects(
                GraphicsDevice,
                windowCreateInfo.WindowWidth,
                windowCreateInfo.WindowHeight
            );
            RenderWidth = (int)windowCreateInfo.WindowWidth;
            RenderHeight = (int)windowCreateInfo.WindowHeight;

			var extraWindowCreateInfo = new WindowCreateInfo
			{
				WindowTitle = "Extra Window",
				WindowWidth = 1280,
				WindowHeight = 720,
				ScreenMode = ScreenMode.Windowed
			};

			ExtraWindow = new OSWindow(extraWindowCreateInfo);
        }

        protected override void Update(System.TimeSpan dt)
        {
            // Insert your game update logic here.
        }

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

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

            commandBuffer.BeginRenderPass(
                GraphicsObjects.RenderPasses.ExampleRenderPass,
                GraphicsObjects.Framebuffers.ExampleFramebuffer,
                new Rect
                {
                    X = 0,
                    Y = 0,
                    W = RenderWidth,
                    H = RenderHeight
                },
                Color.CornflowerBlue.ToVector4()
            );

			commandBuffer.EndRenderPass();

            commandBuffer.QueuePresent(
                GraphicsObjects.RenderTargets.ExampleRenderTarget.TextureSlice,
                Filter.Nearest,
				Window
            );

            GraphicsDevice.Submit(commandBuffer);
		}

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

            commandBuffer.BeginRenderPass(
                GraphicsObjects.RenderPasses.ExtraWindowRenderPass,
                GraphicsObjects.Framebuffers.ExtraWindowFramebuffer,
                new Rect
                {
                    X = 0,
                    Y = 0,
                    W = RenderWidth,
                    H = RenderHeight
                },
                Color.OrangeRed.ToVector4()
            );

			commandBuffer.EndRenderPass();

			commandBuffer.QueuePresent(
				GraphicsObjects.RenderTargets.ExtraWindowRenderTarget.TextureSlice,
				Filter.Nearest,
				ExtraWindow
			);

			GraphicsDevice.Submit(commandBuffer);
		}
    }
}