Implement new immediate mode.

Dashboard.Common/Drawing/IImmediateMode.cs

@@ -0,0 +1,15 @@
+using System.Drawing;
+using System.Numerics;
+using Dashboard.Pal;
+
+namespace Dashboard.Drawing
+{
+    public interface IImmediateMode : IDeviceContextExtension
+    {
+        void ClearColor(Color color);
+
+        void Line(Vector2 a, Vector2 b, float width, float depth, Vector4 color);
+        void Rectangle(Box2d rectangle, float depth, Vector4 color);
+        void Image(Box2d rectangle, Box2d uv, float depth, ITexture texture);
+    }
+}

Dashboard.Common/Drawing/ITextureExtension.cs

@@ -1,6 +1,7 @@
 using System.Drawing;
+using Dashboard.Pal;
 
-namespace Dashboard.Pal
+namespace Dashboard.Drawing
 {
     public interface ITextureExtension : IDeviceContextExtension
     {

Dashboard.Common/Pal/AppContext.cs

@@ -1,5 +1,6 @@
 using Dashboard.Collections;
 using Dashboard.Windowing;
+using BindingFlags = System.Reflection.BindingFlags;
 
 namespace Dashboard.Pal
 {
@@ -94,7 +95,7 @@ namespace Dashboard.Pal
             return _preloadedExtensions.Add<T>(() => new T());
         }
 
-        public T ExtensionRequire<T>() where T : IAppContextExtension, new()
+        public T ExtensionRequire<T>() where T : IAppContextExtension
         {
             T? extension = default;
 
@@ -112,7 +113,8 @@ namespace Dashboard.Pal
                 }
                 else
                 {
-                    extension = new T();
+                    extension = (T?)typeof(T).GetConstructor(BindingFlags.Public, [])?.Invoke([]) ??
+                                throw new Exception("Constructor not found.");
                 }
 
                 _extensions.Add(extension);

Dashboard.Common/Pal/DeviceContext.cs

@@ -1,4 +1,5 @@
 using Dashboard.Collections;
+using BindingFlags = System.Reflection.BindingFlags;
 
 namespace Dashboard.Pal
 {
@@ -41,7 +42,7 @@ namespace Dashboard.Pal
             return _preloadedExtensions.Add<T>(() => new T());
         }
 
-        public T ExtensionRequire<T>() where T : IDeviceContextExtension, new()
+        public T ExtensionRequire<T>() where T : IDeviceContextExtension
         {
             T? extension = default;
 
@@ -59,7 +60,9 @@ namespace Dashboard.Pal
                 }
                 else
                 {
-                    extension = new T();
+                    extension =(T)(
+                        typeof(T).GetConstructor(BindingFlags.Public, []) ?.Invoke([])
+                        ?? throw new Exception("Could not find a suitable constructor for the given extension."));
                 }
 
                 _extensions.Add(extension);

Dashboard.Common/Pal/IContextBase.cs

@@ -63,7 +63,7 @@ namespace Dashboard.Pal
         /// </summary>
         /// <typeparam name="T">The extension to require.</typeparam>
         /// <returns>The extension instance.</returns>
-        T ExtensionRequire<T>() where T : TExtension, new();
+        T ExtensionRequire<T>() where T : TExtension;
     }
 
     /// <summary>

Dashboard.Common/Windowing/IWindow.cs

@@ -1,5 +1,6 @@
 using System.Drawing;
 using Dashboard.Events;
+using Dashboard.Pal;
 
 namespace Dashboard.Windowing
 {
@@ -59,7 +60,7 @@ namespace Dashboard.Windowing
         /// <summary>
         /// The device context for this window.
         /// </summary>
-        IDeviceContext DeviceContext { get; }
+        DeviceContext DeviceContext { get; }
 
         /// <summary>
         /// True if the window is double buffered.

Dashboard.Drawing.OpenGL/Dashboard.Drawing.OpenGL.csproj

@@ -9,7 +9,6 @@
 
     <ItemGroup>
       <PackageReference Include="BlurgText" Version="0.1.0-nightly-19" />
-      <PackageReference Include="OpenTK.Graphics" Version="[5.0.0-pre.*,5.1)" />
     </ItemGroup>
 
     <ItemGroup>

Dashboard.Drawing/DrawBuffer.cs

@@ -0,0 +1,26 @@
+using System.Numerics;
+
+namespace Dashboard.Drawing
+{
+    public enum DrawPrimitive
+    {
+        Point,
+        Line,
+        LineStrip,
+        Triangle,
+        TriangleFan,
+        TriangleStrip
+    }
+
+    public record struct DrawVertex(Vector3 Position, Vector3 TextureCoordinate, Vector4 Color);
+
+    public record DrawInfo(DrawPrimitive Primitive, int Count)
+    {
+
+    }
+
+    public class DrawBuffer
+    {
+
+    }
+}

Dashboard.OpenGL/Dashboard.OpenGL.csproj

@@ -4,10 +4,19 @@
         <TargetFramework>net8.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
+        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     </PropertyGroup>
 
     <ItemGroup>
+      <PackageReference Include="OpenTK.Graphics" Version="[5.0.0-pre.*,5.1)" />
       <ProjectReference Include="..\Dashboard.Common\Dashboard.Common.csproj" />
     </ItemGroup>
 
+    <ItemGroup>
+      <None Remove="Drawing\immediate.frag" />
+      <EmbeddedResource Include="Drawing\immediate.frag" />
+      <None Remove="Drawing\immediate.vert" />
+      <EmbeddedResource Include="Drawing\immediate.vert" />
+    </ItemGroup>
+
 </Project>

Dashboard.OpenGL/Drawing/ImmediateMode.cs

@@ -0,0 +1,229 @@
+using System.Drawing;
+using System.Numerics;
+using System.Runtime.InteropServices;
+using Dashboard.Drawing;
+using Dashboard.Drawing.OpenGL.Pal;
+using Dashboard.Pal;
+using OpenTK.Graphics.OpenGL;
+
+namespace Dashboard.OpenGL.Drawing
+{
+    public class ImmediateMode : IImmediateMode
+    {
+        public string DriverName => "Dashboard OpenGL Immediate Mode";
+        public string DriverVendor => "Dashboard";
+        public Version DriverVersion { get; } = new Version(1, 0);
+
+        public DeviceContext Context { get; private set; } = null!;
+
+        private int _program;
+        private uint _program_apos;
+        private uint _program_atexcoord;
+        private uint _program_acolor;
+        private int _program_transforms;
+        private int _program_image;
+        private int _vao;
+        private int _white;
+
+        public void Dispose()
+        {
+        }
+
+        public void Require(DeviceContext context)
+        {
+            Context = context;
+
+            _program = GL.CreateProgram();
+
+            int vs = GL.CreateShader(ShaderType.VertexShader);
+
+            using (StreamReader reader = new StreamReader(GetType().Assembly
+                       .GetManifestResourceStream("Dashboard.OpenGL.Drawing.immediate.vert")!))
+            {
+                GL.ShaderSource(vs, reader.ReadToEnd());
+            }
+            GL.CompileShader(vs);
+            GL.AttachShader(_program, vs);
+
+            int fs = GL.CreateShader(ShaderType.FragmentShader);
+
+            using (StreamReader reader = new StreamReader(GetType().Assembly
+                       .GetManifestResourceStream("Dashboard.OpenGL.Drawing.immediate.frag")!))
+            {
+                GL.ShaderSource(fs, reader.ReadToEnd());
+            }
+
+            GL.CompileShader(fs);
+            GL.AttachShader(_program, fs);
+
+            GL.LinkProgram(_program);
+            GL.DeleteShader(vs); GL.DeleteShader(fs);
+
+            _program_apos = (uint)GL.GetAttribLocation(_program, "aPos");
+            _program_atexcoord = (uint)GL.GetAttribLocation(_program, "aTexCoords");
+            _program_acolor = (uint)GL.GetAttribLocation(_program, "aColor");
+
+            _program_transforms = GL.GetUniformLocation(_program, "transforms");
+            _program_image = GL.GetUniformLocation(_program, "image");
+
+            GL.GenTexture(out _white);
+            GL.BindTexture(TextureTarget.Texture2d, _white);
+            GL.TexImage2D(TextureTarget.Texture2d, 0, InternalFormat.Rgb, 1, 1, 0, OpenTK.Graphics.OpenGL.PixelFormat.Rgb, PixelType.Byte, IntPtr.Zero);
+            GL.TexParameteri(TextureTarget.Texture2d, TextureParameterName.TextureSwizzleA, (int)All.One);
+            GL.TexParameteri(TextureTarget.Texture2d, TextureParameterName.TextureSwizzleR, (int)All.One);
+            GL.TexParameteri(TextureTarget.Texture2d, TextureParameterName.TextureSwizzleG, (int)All.One);
+            GL.TexParameteri(TextureTarget.Texture2d, TextureParameterName.TextureSwizzleB, (int)All.One);
+            GL.TexParameteri(TextureTarget.Texture2d, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
+            GL.TexParameteri(TextureTarget.Texture2d, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
+
+            GL.GenVertexArray(out _vao);
+        }
+
+        public void ClearColor(Color color)
+        {
+            GL.ClearColor(color.R / 255f, color.G / 255f, color.B / 255f, color.A / 255f);
+            GL.Clear(ClearBufferMask.ColorBufferBit);
+        }
+
+        public void Line(Vector2 a, Vector2 b, float width, float depth, Vector4 color)
+        {
+            Vector2 normal = Vector2.Normalize(b - a);
+            Vector2 tangent = new Vector2(-normal.Y, normal.X) * width;
+            Span<ImmediateVertex> vertices =
+            [
+                new ImmediateVertex(new Vector3(a-tangent, depth), Vector2.Zero, color),
+                new ImmediateVertex(new Vector3(b-tangent, depth), Vector2.Zero, color),
+                new ImmediateVertex(new Vector3(b+tangent, depth), Vector2.Zero, color),
+                new ImmediateVertex(new Vector3(a-tangent, depth), Vector2.Zero, color),
+                new ImmediateVertex(new Vector3(b+tangent, depth), Vector2.Zero, color),
+                new ImmediateVertex(new Vector3(a+tangent, depth), Vector2.Zero, color),
+            ];
+
+            int buffer = GL.GenBuffer();
+            GL.BindBuffer(BufferTarget.ArrayBuffer, buffer);
+            GL.BufferData(BufferTarget.ArrayBuffer, vertices.Length * ImmediateVertex.Size, ref vertices[0], BufferUsage.StreamDraw);
+
+            GL.BindVertexArray(_vao);
+            GL.VertexAttribPointer(_program_apos, 3, VertexAttribPointerType.Float, false, ImmediateVertex.Size, ImmediateVertex.PosOffset);
+            GL.EnableVertexAttribArray(_program_apos);
+            GL.VertexAttribPointer(_program_atexcoord, 2, VertexAttribPointerType.Float, false, ImmediateVertex.Size, ImmediateVertex.TexCoordsOffset);
+            GL.EnableVertexAttribArray(_program_atexcoord);
+            GL.VertexAttribPointer(_program_acolor, 4, VertexAttribPointerType.Float, false, ImmediateVertex.Size, ImmediateVertex.ColorOffset);
+            GL.EnableVertexAttribArray(_program_acolor);
+
+            Size size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
+            Matrix4x4 view = Matrix4x4.CreateOrthographicOffCenter(0, size.Width, 0, size.Height, 1, -1);
+
+            GL.UseProgram(_program);
+
+            GL.ActiveTexture(TextureUnit.Texture0);
+            GL.BindTexture(TextureTarget.Texture2d, _white);
+
+            GL.UniformMatrix4f(_program_transforms, 1, true, ref view);
+            GL.Uniform1i(_program_image, 0);
+
+            GL.DrawArrays(PrimitiveType.Triangles, 0, 6);
+
+            GL.DeleteBuffer(buffer);
+        }
+
+        public void Rectangle(Box2d rectangle, float depth, Vector4 color)
+        {
+            Span<ImmediateVertex> vertices =
+            [
+                new ImmediateVertex(new Vector3(rectangle.Min.X, rectangle.Min.Y, depth), Vector2.Zero, color),
+                new ImmediateVertex(new Vector3(rectangle.Max.X, rectangle.Min.Y, depth), Vector2.Zero, color),
+                new ImmediateVertex(new Vector3(rectangle.Max.X, rectangle.Max.Y, depth), Vector2.Zero, color),
+                new ImmediateVertex(new Vector3(rectangle.Min.X, rectangle.Min.Y, depth), Vector2.Zero, color),
+                new ImmediateVertex(new Vector3(rectangle.Max.X, rectangle.Max.Y, depth), Vector2.Zero, color),
+                new ImmediateVertex(new Vector3(rectangle.Min.X, rectangle.Max.Y, depth), Vector2.Zero, color),
+            ];
+
+            int buffer = GL.GenBuffer();
+            GL.BindBuffer(BufferTarget.ArrayBuffer, buffer);
+            GL.BufferData(BufferTarget.ArrayBuffer, vertices.Length * ImmediateVertex.Size, ref vertices[0], BufferUsage.StreamDraw);
+
+            GL.BindVertexArray(_vao);
+            GL.VertexAttribPointer(_program_apos, 3, VertexAttribPointerType.Float, false, ImmediateVertex.Size, ImmediateVertex.PosOffset);
+            GL.EnableVertexAttribArray(_program_apos);
+            GL.VertexAttribPointer(_program_atexcoord, 2, VertexAttribPointerType.Float, false, ImmediateVertex.Size, ImmediateVertex.TexCoordsOffset);
+            GL.EnableVertexAttribArray(_program_atexcoord);
+            GL.VertexAttribPointer(_program_acolor, 4, VertexAttribPointerType.Float, false, ImmediateVertex.Size, ImmediateVertex.ColorOffset);
+            GL.EnableVertexAttribArray(_program_acolor);
+
+            Size size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
+            Matrix4x4 view = Matrix4x4.CreateOrthographicOffCenter(0, size.Width, 0, size.Height, 1, -1);
+
+            GL.UseProgram(_program);
+
+            GL.ActiveTexture(TextureUnit.Texture0);
+            GL.BindTexture(TextureTarget.Texture2d, _white);
+
+            GL.UniformMatrix4f(_program_transforms, 1, true, ref view);
+            GL.Uniform1i(_program_image, 0);
+
+            GL.DrawArrays(PrimitiveType.Triangles, 0, 6);
+
+            GL.DeleteBuffer(buffer);
+        }
+
+        public void Image(Box2d rectangle, Box2d uv, float depth, ITexture texture)
+        {
+            Span<ImmediateVertex> vertices =
+            [
+                new ImmediateVertex(new Vector3(rectangle.Min.X, rectangle.Min.Y, depth), new Vector2(uv.Min.X, uv.Min.Y), Vector4.One),
+                new ImmediateVertex(new Vector3(rectangle.Max.X, rectangle.Min.Y, depth), new Vector2(uv.Max.X, uv.Min.Y), Vector4.One),
+                new ImmediateVertex(new Vector3(rectangle.Max.X, rectangle.Max.Y, depth), new Vector2(uv.Max.X, uv.Max.Y), Vector4.One),
+                new ImmediateVertex(new Vector3(rectangle.Min.X, rectangle.Min.Y, depth), new Vector2(uv.Min.X, uv.Min.Y), Vector4.One),
+                new ImmediateVertex(new Vector3(rectangle.Max.X, rectangle.Max.Y, depth), new Vector2(uv.Max.X, uv.Max.Y), Vector4.One),
+                new ImmediateVertex(new Vector3(rectangle.Min.X, rectangle.Max.Y, depth), new Vector2(uv.Min.X, uv.Max.Y), Vector4.One),
+            ];
+
+            int buffer = GL.GenBuffer();
+            GL.BindBuffer(BufferTarget.ArrayBuffer, buffer);
+            GL.BufferData(BufferTarget.ArrayBuffer, vertices.Length * ImmediateVertex.Size, ref vertices[0], BufferUsage.StreamDraw);
+
+            GL.BindVertexArray(_vao);
+            GL.VertexAttribPointer(_program_apos, 3, VertexAttribPointerType.Float, false, ImmediateVertex.Size, ImmediateVertex.PosOffset);
+            GL.EnableVertexAttribArray(_program_apos);
+            GL.VertexAttribPointer(_program_atexcoord, 2, VertexAttribPointerType.Float, false, ImmediateVertex.Size, ImmediateVertex.TexCoordsOffset);
+            GL.EnableVertexAttribArray(_program_atexcoord);
+            GL.VertexAttribPointer(_program_acolor, 4, VertexAttribPointerType.Float, false, ImmediateVertex.Size, ImmediateVertex.ColorOffset);
+            GL.EnableVertexAttribArray(_program_acolor);
+            Size size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
+            Matrix4x4 view = Matrix4x4.CreateOrthographicOffCenter(0, size.Width, 0, size.Height, 1, -1);
+
+            GL.UseProgram(_program);
+
+            GL.ActiveTexture(TextureUnit.Texture0);
+            GL.BindTexture(TextureTarget.Texture2d, ((GLTexture)texture).Handle);
+
+            GL.UniformMatrix4f(_program_transforms, 1, true, ref view);
+            GL.Uniform1i(_program_image, 0);
+
+            GL.DrawArrays(PrimitiveType.Triangles, 0, 6);
+
+            GL.DeleteBuffer(buffer);
+        }
+
+        IContextBase IContextExtensionBase.Context => Context;
+
+        void IContextExtensionBase.Require(IContextBase context)
+        {
+            Require((DeviceContext)context);
+        }
+
+        [StructLayout(LayoutKind.Explicit, Pack = sizeof(float) * 4, Size = Size)]
+        private struct ImmediateVertex(Vector3 position, Vector2 texCoords, Vector4 color)
+        {
+            [FieldOffset(PosOffset)]       public Vector3 Position = position;
+            [FieldOffset(TexCoordsOffset)] public Vector2 TexCoords = texCoords;
+            [FieldOffset(ColorOffset)]     public Vector4 Color = color;
+
+            public const int Size = 16 * sizeof(float);
+            public const int PosOffset = 0 * sizeof(float);
+            public const int TexCoordsOffset = 4 * sizeof(float);
+            public const int ColorOffset = 8 * sizeof(float);
+        }
+    }
+}

Dashboard.OpenGL/Drawing/immediate.frag

@@ -0,0 +1,12 @@
+#version 130
+
+uniform sampler2D image;
+
+in vec2 vTexCoords;
+in vec4 vColor;
+
+out vec4 fragColor;
+
+void main() {
+    fragColor = vColor * texture(image, vTexCoords);
+}

Dashboard.OpenGL/Drawing/immediate.vert

@@ -0,0 +1,18 @@
+#version 130
+
+uniform mat4 transforms;
+
+in vec3 aPos;
+in vec2 aTexCoords;
+in vec4 aColor;
+
+out vec2 vTexCoords;
+out vec4 vColor;
+
+void main() {
+    vec4 position = vec4(aPos, 1.0) * transforms;
+    gl_Position = position;
+
+    vTexCoords = aTexCoords;
+    vColor = aColor;
+}

Dashboard.OpenGL/Pal/GLDeviceContext.cs

@@ -1,6 +1,7 @@
 using System.Collections.Concurrent;
 using System.Collections.Immutable;
 using Dashboard.OpenGL;
+using Dashboard.OpenGL.Drawing;
 using Dashboard.Pal;
 using OpenTK;
 using OpenTK.Graphics;
@@ -62,6 +63,7 @@ namespace Dashboard.Drawing.OpenGL.Pal
             Extensions = extensions.ToImmutableHashSet();
 
             ExtensionPreload<GLTextureExtension>();
+            ExtensionPreload<ImmediateMode>();
         }
 
         public bool IsGLExtensionAvailable(string name)

Dashboard.OpenTK/PAL2/Pal2AppContext.cs

@@ -1,3 +1,4 @@
+using Dashboard.Drawing.OpenGL.Pal;
 using Dashboard.Windowing;
 using OpenTK.Graphics;
 using OpenTK.Platform;
@@ -12,7 +13,6 @@ namespace Dashboard.OpenTK.PAL2
         public override string DriverVendor => "Dashboard";
         public override Version DriverVersion => new Version(0, 1);
         public GraphicsApiHints GraphicsApiHints { get; set; } = new OpenGLGraphicsApiHints();
-        public bool OpenGLBindingsInitialized { get; private set; } = false;
 
         private readonly List<PhysicalWindow> _windows = new List<PhysicalWindow>();
 
@@ -21,14 +21,6 @@ namespace Dashboard.OpenTK.PAL2
             PhysicalWindow window = new PhysicalWindow(GraphicsApiHints);
             _windows.Add(window);
 
-            if (!OpenGLBindingsInitialized)
-            {
-                OpenGLBindingsInitialized = true;
-                GLLoader.LoadBindings(
-                    new Pal2BindingsContext(TK.OpenGL,
-                    ((OpenGLDeviceContext)window.DeviceContext).ContextHandle));
-            }
-
             return window;
         }
 

Dashboard.OpenTK/PAL2/Pal2GLContext.cs

@@ -1,6 +1,7 @@
 using System.Collections.Concurrent;
 using System.Drawing;
 using Dashboard.OpenGL;
+using Dashboard.Pal;
 using Dashboard.Windowing;
 using OpenTK.Mathematics;
 using OpenTK.Platform;
@@ -8,7 +9,7 @@ using TK = OpenTK.Platform.Toolkit;
 
 namespace Dashboard.OpenTK.PAL2
 {
-    public class OpenGLDeviceContext : IGLContext, IGLDisposable
+    public class Pal2GLContext : IGLContext, IDisposable
     {
         public OpenGLContextHandle ContextHandle { get; }
         public WindowHandle WindowHandle { get; }
@@ -27,12 +28,12 @@ namespace Dashboard.OpenTK.PAL2
 
         public event Action? Disposed;
 
-        public OpenGLDeviceContext(WindowHandle window, OpenGLContextHandle context, ISwapGroup? group = null)
+        public Pal2GLContext(WindowHandle window, OpenGLContextHandle context)
         {
             WindowHandle = window;
             ContextHandle = context;
-            SwapGroup = group ?? new DummySwapGroup(context);
+            SwapGroup = new DummySwapGroup(context);
-            ContextGroup = GetContextGroup(context);
+            ContextGroup = GetContextGroup(ContextHandle);
         }
 
         public void MakeCurrent()
@@ -45,18 +46,13 @@ namespace Dashboard.OpenTK.PAL2
             return TK.OpenGL.GetProcedureAddress(ContextHandle, procName);
         }
 
-        private bool _isDisposed = false;
-
         public void Dispose() => Dispose(true);
 
-        public void Dispose(bool safeExit)
+        protected void Dispose(bool isDisposing)
         {
-            if (_isDisposed) return;
-            _isDisposed = true;
-
             if (SwapGroup is IGLDisposable glDisposable)
             {
-                glDisposable.Dispose(safeExit);
+                glDisposable.Dispose(isDisposing);
             }
             else if (SwapGroup is IDisposable disposable)
             {

Dashboard.OpenTK/PAL2/PhysicalWindow.cs

@@ -1,7 +1,9 @@
 using System.Collections.Concurrent;
 using System.Drawing;
 using Dashboard.Drawing;
+using Dashboard.Drawing.OpenGL.Pal;
 using Dashboard.Events;
+using Dashboard.Pal;
 using Dashboard.Windowing;
 using OpenTK.Mathematics;
 using OpenTK.Platform;
@@ -14,7 +16,7 @@ namespace Dashboard.OpenTK.PAL2
     {
         public DrawQueue DrawQueue { get; } = new DrawQueue();
         public WindowHandle WindowHandle { get; }
-        public IDeviceContext DeviceContext { get; }
+        public DeviceContext DeviceContext { get; }
         public bool DoubleBuffered => true; // Always true for OpenTK windows.
 
         public IWindowManager? WindowManager { get; set; }
@@ -52,17 +54,17 @@ namespace Dashboard.OpenTK.PAL2
         public event EventHandler<MouseButtonEventArgs>? MouseButtonUp;
         public event EventHandler<MouseScrollEventArgs>? MouseScroll;
 
-        public PhysicalWindow(WindowHandle window, IDeviceContext dc)
+        public PhysicalWindow(WindowHandle window)
         {
             WindowHandle = window;
-            DeviceContext = dc;
+            DeviceContext = CreateDeviceContext(window, new OpenGLGraphicsApiHints());
             AddWindow(this);
         }
 
-        public PhysicalWindow(WindowHandle window, OpenGLContextHandle context, ISwapGroup? swapGroup = null)
+        public PhysicalWindow(WindowHandle window, OpenGLContextHandle context)
         {
             WindowHandle = window;
-            DeviceContext = new OpenGLDeviceContext(window, context, swapGroup);
+            DeviceContext = new GLDeviceContext(new Pal2GLContext(window, context));
             AddWindow(this);
         }
 
@@ -73,14 +75,13 @@ namespace Dashboard.OpenTK.PAL2
             AddWindow(this);
         }
 
-        private static IDeviceContext CreateDeviceContext(WindowHandle window, GraphicsApiHints hints)
+        private static DeviceContext CreateDeviceContext(WindowHandle window, GraphicsApiHints hints)
         {
             switch (hints.Api)
             {
             case GraphicsApi.OpenGL:
             case GraphicsApi.OpenGLES:
-                OpenGLContextHandle context = TK.OpenGL.CreateFromWindow(window);
+                return new GLDeviceContext(new Pal2GLContext(window, TK.OpenGL.CreateFromWindow(window)));
-                return new OpenGLDeviceContext(window, context);
             default:
                 throw new Exception($"Unknown graphics API {hints.Api}.");
             }

Dashboard/Controls/Control.cs

@@ -4,7 +4,7 @@ using Dashboard.Windowing;
 
 namespace Dashboard.Controls
 {
-    public class Control : IEventListener, IDrawQueuePaintable, IDisposable
+    public class Control : IEventListener, IDisposable
     {
         public string? Id { get; set; }
         public ClassSet Classes { get; }

Dashboard/Controls/Form.cs

@@ -6,7 +6,6 @@ namespace Dashboard.Controls
     public class Form : Control
     {
         public IWindow Window { get; }
-        public override DrawQueue DrawQueue { get; }
 
         public override Box2d ClientArea
         {
@@ -17,7 +16,6 @@ namespace Dashboard.Controls
         public Form(IWindow window)
         {
             Window = window;
-            DrawQueue = (window as IDrawQueuePaintable)?.DrawQueue ?? new DrawQueue();
         }
     }
 }

Dashboard/Controls/Label.cs

@@ -27,7 +27,6 @@ namespace Dashboard.Controls
             ClientArea = new Box2d(ClientArea.Min, ClientArea.Min + (Vector2)sz);
         }
 
-
         public override void OnPaint()
         {
             base.OnPaint();

tests/Dashboard.TestApplication/Program.cs

@@ -10,9 +10,11 @@ using OpenTK.Mathematics;
 using Box2d = Dashboard.Box2d;
 using TK = OpenTK.Platform.Toolkit;
 using Dashboard;
+using Dashboard.Drawing.OpenGL.Pal;
 using Dashboard.Windowing;
 using OpenTK.Windowing.GraphicsLibraryFramework;
 using AppContext = Dashboard.Pal.AppContext;
+using Vector4 = System.Numerics.Vector4;
 
 TK.Init(new ToolkitOptions()
 {
@@ -51,13 +53,13 @@ PhysicalWindow window;
 SolidBrush fg = new SolidBrush(Color.FromArgb(0, 0, 0, 0));
 SolidBrush bg = new SolidBrush(Color.Black);
 CancellationTokenSource source = new CancellationTokenSource();
-GLEngine engine;
+// GLEngine engine;
-ContextExecutor executor;
+// ContextExecutor executor;
-DimUI dimUI;
+// DimUI dimUI;
 Vector2 mousePos = Vector2.Zero;
 Random r = new Random();
 List<Vector3> points = new List<Vector3>();
-IFont font;
+// IFont font;
 StringBuilder builder = new StringBuilder();
 
 app.Initialize();
@@ -70,20 +72,20 @@ TK.Window.SetClientSize(window.WindowHandle, new Vector2i(320, 240));
 TK.Window.SetBorderStyle(window.WindowHandle, WindowBorderStyle.ResizableBorder);
 // TK.Window.SetTransparencyMode(wnd, WindowTransparencyMode.TransparentFramebuffer, 0.1f);
 
-OpenGLDeviceContext context = (OpenGLDeviceContext)window.DeviceContext;
+GLDeviceContext context = (GLDeviceContext)window.DeviceContext;
 
-context.MakeCurrent();
+context.GLContext.MakeCurrent();
-context.SwapGroup.SwapInterval = 1;
+context.GLContext.SwapGroup.SwapInterval = 1;
 
-engine = new GLEngine();
+// engine = new GLEngine();
-engine.Initialize();
+// engine.Initialize();
-
+//
-executor = engine.GetExecutor(context);
+// executor = engine.GetExecutor(context);
-
+//
-dimUI = new DimUI(new DimUIConfig()
+// dimUI = new DimUI(new DimUIConfig()
-{
+// {
-    Font = new NamedFont("Noto Sans", 9f),
+//     Font = new NamedFont("Noto Sans", 9f),
-});
+// });
 
 EventQueue.EventRaised += (handle, type, eventArgs) =>
 {
@@ -102,66 +104,66 @@ EventQueue.EventRaised += (handle, type, eventArgs) =>
 };
 
 TK.Window.SetMode(window.WindowHandle, WindowMode.Normal);
-font = Typesetter.LoadFont("Nimbus Mono", 12f);
+// font = Typesetter.LoadFont("Nimbus Mono", 12f);
 
 window.Painting += (sender, ea) => {
-        TK.Window.GetSize(context.WindowHandle, out Vector2i size);
+        TK.Window.GetSize(window.WindowHandle, out Vector2i size);
-        executor.BeginFrame();
+        // executor.BeginFrame();
-
+        //
-        dimUI.Begin(new Box2d(0, 0, size.X, size.Y), window.DrawQueue);
+        // dimUI.Begin(new Box2d(0, 0, size.X, size.Y), window.DrawQueue);
-        dimUI.Text("Hello World!");
+        // dimUI.Text("Hello World!");
-        dimUI.Button("Cancel"); dimUI.SameLine();
+        // dimUI.Button("Cancel"); dimUI.SameLine();
-        dimUI.Button("OK");
+        // dimUI.Button("OK");
-
+        //
-        dimUI.Input("type me!", builder);
+        // dimUI.Input("type me!", builder);
-
+        //
-        dimUI.BeginMenu();
+        // dimUI.BeginMenu();
-
+        //
-        if (dimUI.MenuItem("File"))
+        // if (dimUI.MenuItem("File"))
-        {
+        // {
-            dimUI.BeginMenu();
+        //     dimUI.BeginMenu();
-            dimUI.MenuItem("New Window");
+        //     dimUI.MenuItem("New Window");
-            dimUI.MenuItem("Preferences");
+        //     dimUI.MenuItem("Preferences");
-            dimUI.MenuItem("Exit");
+        //     dimUI.MenuItem("Exit");
-            dimUI.EndMenu();
+        //     dimUI.EndMenu();
-        }
+        // }
-
+        //
-        if (dimUI.MenuItem("Edit"))
+        // if (dimUI.MenuItem("Edit"))
-        {
+        // {
-            dimUI.BeginMenu();
+        //     dimUI.BeginMenu();
-            dimUI.MenuItem("Cut");
+        //     dimUI.MenuItem("Cut");
-            dimUI.MenuItem("Copy");
+        //     dimUI.MenuItem("Copy");
-            dimUI.MenuItem("Paste");
+        //     dimUI.MenuItem("Paste");
-
+        //
-            if (dimUI.MenuItem("Send Char"))
+        //     if (dimUI.MenuItem("Send Char"))
-            {
+        //     {
-                dimUI.BeginMenu();
+        //         dimUI.BeginMenu();
-                dimUI.EndMenu();
+        //         dimUI.EndMenu();
-            }
+        //     }
-
+        //
-            dimUI.EndMenu();
+        //     dimUI.EndMenu();
-        }
+        // }
-
+        //
-        if (dimUI.MenuItem("View"))
+        // if (dimUI.MenuItem("View"))
-        {
+        // {
-            dimUI.BeginMenu();
+        //     dimUI.BeginMenu();
-            dimUI.MenuItem("Clear");
+        //     dimUI.MenuItem("Clear");
-
+        //
-            if (dimUI.MenuItem("Set Size"))
+        //     if (dimUI.MenuItem("Set Size"))
-            {
+        //     {
-                dimUI.BeginMenu();
+        //         dimUI.BeginMenu();
-                dimUI.MenuItem("24 x 40");
+        //         dimUI.MenuItem("24 x 40");
-                dimUI.MenuItem("25 x 40");
+        //         dimUI.MenuItem("25 x 40");
-                dimUI.MenuItem("24 x 80");
+        //         dimUI.MenuItem("24 x 80");
-                dimUI.MenuItem("25 x 80");
+        //         dimUI.MenuItem("25 x 80");
-                dimUI.MenuItem("25 x 120");
+        //         dimUI.MenuItem("25 x 120");
-                dimUI.EndMenu();
+        //         dimUI.EndMenu();
-            }
+        //     }
-
+        //
-            dimUI.EndMenu();
+        //     dimUI.EndMenu();
-        }
+        // }
-
+        //
-        dimUI.Finish();
+        // dimUI.Finish();
 
         GL.Viewport(0, 0, size.X, size.Y);
         GL.ClearColor(0.3f, 0.3f, 0.3f, 1.0f);
@@ -171,10 +173,14 @@ window.Painting += (sender, ea) => {
         GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
         GL.ColorMask(true, true, true, true);
 
-        executor.Draw(window.DrawQueue, new RectangleF(0, 0, size.X, size.Y), 1.5f /*(window as IDpiAwareWindow)?.Scale ?? 1*/);
+        // executor.Draw(window.DrawQueue, new RectangleF(0, 0, size.X, size.Y), 1.5f /*(window as IDpiAwareWindow)?.Scale ?? 1*/);
-        executor.EndFrame();
+        // executor.EndFrame();
 
-        context.SwapGroup.Swap();
+        IImmediateMode imm = context.ExtensionRequire<IImmediateMode>();
+        imm.ClearColor(Color.Magenta);
+        imm.Line(new System.Numerics.Vector2(10, 10), new System.Numerics.Vector2(50, 50), 3, 0, new Vector4(0.2f, 0.2f, 1.0f, 1.0f));
+
+        context.GLContext.SwapGroup.Swap();
 };
 
 app.Run(true, source.Token);