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Engine/Window.cs

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+using Engine.Renderer;
+using Engine.Renderer.Pixel;
+using Engine.Renderer.Texture;
+using OpenTK.Graphics.OpenGL;
+using OpenTK.Windowing.Desktop;
+using OpenTK.Windowing.GraphicsLibraryFramework;
+
+namespace Engine;
+
+public class Window : IPresenter<Rgb8>
+{
+    public bool IsExiting => _window.IsExiting;
+    public int Width => _window.ClientSize.X;
+    public int Height => _window.ClientSize.Y;
+    
+    private readonly Engine _engine;
+    private readonly NativeWindow _window;
+    private readonly bool _headless;
+
+    public Window(Engine engine, NativeWindow window, bool headless)
+    {
+        _engine = engine;
+        _window = window;
+        _headless = headless;
+        
+        _window.MakeCurrent();
+        _window.Resize +=  args => GL.Viewport(0, 0, args.Width, args.Height);
+    }
+
+    public void Update()
+    {
+        if (!_headless)
+        {
+            NativeWindow.ProcessWindowEvents(false);
+            _window.SwapBuffers();
+        }
+    }
+
+    public void Present(IConstTexture<Rgb8> texture)
+    {
+        if (_headless)
+            return;
+
+        GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
+        
+        _engine.Renderer.TextureInternal.Bind();
+        
+        GL.Enable(EnableCap.Texture2D);
+        GL.Begin(PrimitiveType.Quads);
+        GL.Color3(1, 1, 1);
+        
+        GL.TexCoord2(0, 0);
+        GL.Vertex2(0, 0);
+        
+        GL.TexCoord2(1, 0);
+        GL.Vertex2(1, 0);
+        
+        GL.TexCoord2(1, 1);
+        GL.Vertex2(1, 1);
+        
+        GL.TexCoord2(0, 1);
+        GL.Vertex2(0, 1);
+        
+        GL.End();
+        
+        GL.Disable(EnableCap.Texture2D);
+        GL.Flush();
+        
+        _engine.Renderer.TextureInternal.Unbind();
+    }
+}
+
+public static class NativeWindowExtensions
+{
+    public static unsafe void SwapBuffers(this NativeWindow window)
+    {
+        GLFW.SwapBuffers(window.WindowPtr);
+    }
+}