Refactor rendering interfaces and implementations

- Refactored DirectRendering class to support new IDirectRendering interface and manage textures directly.
- Enhanced ImmediateMode to utilize ImmediateVertex struct for immediate rendering calls.
- Updated Image class to use IDirectRendering for texture creation.
- Modified test application to demonstrate immediate mode rendering with new structures.
- Removed obsolete code related to previous rendering abstractions.

Dashboard.Common/Drawing/DrawCall.cs

@@ -187,17 +187,8 @@ namespace Dashboard.Drawing
 
     public record struct UniformDescriptor(int Location, UniformType Type, long Offset, long Size);
 
-    public struct DrawCall(MeshPrimitive primitive, VertexSpecification vertexSpec, int first, int count)
+    public struct PipelineState()
     {
-        public IShader? ShaderPipeline { get; init; }
-        public VertexSpecification VertexSpecification { get; init; } = vertexSpec;
-
-        public MeshPrimitive Primitive { get; init; } = primitive;
-        public int First { get; init; } = first;
-        public int Count { get; init; } = count;
-        public int BaseVertex { get; init; } = 0;
-        public long Offset { get; init; } = 0;
-
         public Box2d ViewportRegion { get; init; } = new Box2d(Vector2.Zero, Vector2.PositiveInfinity);
         public Box2d ScissorRegion { get; init; } = new Box2d(Vector2.PositiveInfinity, Vector2.PositiveInfinity);
         public WindingOrder FrontFace { get; init; } = WindingOrder.Counterclockwise;
@@ -205,15 +196,41 @@ namespace Dashboard.Drawing
         public BlendMode BlendMode { get; init; } = BlendMode.Normal;
         public DepthMode DepthMode { get; init; } = DepthMode.Enabled;
         public StencilMode StencilMode { get; init; } = StencilMode.Off;
-        public bool EnableRestart { get; init; } = false;
-        public long RestartIndex { get; init; } = -1;
         public bool RedMask { get; init; } = true;
         public bool GreenMask { get; init; } = true;
         public bool BlueMask { get; init; } = true;
         public bool AlphaMask { get; init; } = true;
         public float PointSize { get; init; }= 1.0f;
         public float LineWidth { get; init; }= 1.0f;
+    }
 
+    public struct DrawCall(MeshPrimitive primitive, VertexSpecification vertexSpec, int first, int count)
+    {
+        public IShader? ShaderPipeline { get; init; }
+        public PipelineState PipelineState { get; init; } = new PipelineState();
+        public VertexSpecification VertexSpecification { get; init; } = vertexSpec;
+
+        public MeshPrimitive Primitive { get; init; } = primitive;
+        public int First { get; init; } = first;
+        public int Count { get; init; } = count;
+        public int BaseVertex { get; init; } = 0;
+        public long Offset { get; init; } = 0;
+        public bool EnableRestart { get; init; } = false;
+        public long RestartIndex { get; init; } = -1;
+
+        public Box2d ViewportRegion => PipelineState.ViewportRegion;
+        public Box2d ScissorRegion => PipelineState.ScissorRegion;
+        public WindingOrder FrontFace => PipelineState.FrontFace;
+        public FaceCulling CullMode => PipelineState.CullMode;
+        public BlendMode BlendMode => PipelineState.BlendMode;
+        public DepthMode DepthMode => PipelineState.DepthMode;
+        public StencilMode StencilMode => PipelineState.StencilMode;
+        public bool RedMask => PipelineState.RedMask;
+        public bool GreenMask => PipelineState.GreenMask;
+        public bool BlueMask => PipelineState.BlueMask;
+        public bool AlphaMask => PipelineState.AlphaMask;
+        public float PointSize => PipelineState.PointSize;
+        public float LineWidth => PipelineState.LineWidth;
 
         public List<ITexture?> Textures { get; init; } = [];
         public List<UniformDescriptor> Uniforms { get; init; } = [];

Dashboard.Common/Drawing/IBuffer.cs

@@ -0,0 +1,43 @@
+namespace Dashboard.Drawing
+{
+    public enum BufferAccessPattern
+    {
+        /// <summary>
+        /// No hint given. Not recommended.
+        /// </summary>
+        DontCare,
+
+        /// <summary>
+        /// For buffers which have a long lifetime, but the contents are initialized once.
+        /// </summary>
+        Static,
+
+        /// <summary>
+        /// For buffers which have a long lifetime, but the contents can be updated every frame.
+        /// </summary>
+        Stream,
+
+        /// <summary>
+        /// For buffers which have a short lifetime, used for streaming resources to the graphics hardware.
+        /// </summary>
+        Upload,
+
+        /// <summary>
+        /// For buffers which have a short lifetime, used for streaming resources from the graphics hardware.
+        /// </summary>
+        Download,
+    }
+
+
+    public interface IBuffer : IDisposable
+    {
+        public BufferAccessPattern AccessPattern { get; }
+        public long Size { get; }
+
+        void Reallocate(long newSize);
+        Span<T> Map<T>(long offset, int count = -1) where T : unmanaged;
+        void Unmap();
+        void Read<T>(long offset, Span<T> span) where T : unmanaged;
+        void Write<T>(long offset, ReadOnlySpan<T> span) where T : unmanaged;
+    }
+}

Dashboard.Common/Drawing/IDirectRendering.cs

@@ -2,66 +2,49 @@ using Dashboard.Pal;
 
 namespace Dashboard.Drawing
 {
-    public interface IShader : IDisposable
-    {
-    }
-
-    /// <summary>
-    /// Base interface for creating shader pipelines.
-    /// </summary>
-    public interface IShaderCreateInfo
-    {
-    }
-
-    public enum BufferAccessPattern
-    {
-        /// <summary>
-        /// No hint given. Not recommended.
-        /// </summary>
-        DontCare,
-
-        /// <summary>
-        /// For buffers which have a long lifetime, but the contents are initialized once.
-        /// </summary>
-        Static,
-
-        /// <summary>
-        /// For buffers which have a long lifetime, but the contents can be updated every frame.
-        /// </summary>
-        Stream,
-
-        /// <summary>
-        /// For buffers which have a short lifetime, used for streaming resources to the graphics hardware.
-        /// </summary>
-        Upload,
-
-        /// <summary>
-        /// For buffers which have a short lifetime, used for streaming resources from the graphics hardware.
-        /// </summary>
-        Download,
-    }
-
-    public interface IBuffer : IDisposable
-    {
-        public BufferAccessPattern AccessPattern { get; }
-        public long Size { get; }
-
-        void Reallocate(long newSize);
-        Span<T> Map<T>(long offset, int count = -1) where T : unmanaged;
-        void Unmap();
-        void Read<T>(long offset, Span<T> span) where T : unmanaged;
-        void Write<T>(long offset, ReadOnlySpan<T> span) where T : unmanaged;
-    }
-
     /// <summary>
     /// This extension provides direct access to the backend rendering pipeline without writing with a higher level
     /// abstraction than the rendering backend.
     /// </summary>
     public interface IDirectRendering : IDeviceContextExtension
     {
-        public IShader CreatePipeline<T>(T createInfo) where T : IShaderCreateInfo;
-        public IBuffer CreateBuffer(BufferAccessPattern pattern, long size);
+        /// <summary>
+        /// Create a shader program.
+        /// </summary>
+        /// <typeparam name="T">Type of the shader create info object.</typeparam>
+        /// <param name="createInfo">An object which describes how the shader is created.</param>
+        /// <returns>A shader program object.</returns>
+        /// <seealso cref="SpirvShaderCreateInfo"/> 
+        /// <seealso cref="GlslShaderCreateInfo"/>
+        /// <seealso cref="GlslComputeShaderCreateInfo"/>
+        IShader CreateShader<T>(T createInfo) where T : IShaderCreateInfo;
 
+        /// <summary>
+        /// Create a texture object.
+        /// </summary>
+        /// <param name="type">Type of texture to create.</param>
+        /// <returns>An empty texture object.</returns>
+        ITexture CreateTexture(TextureType type);
+
+        /// <summary>
+        /// Create a buffer object.
+        /// </summary>
+        /// <param name="pattern">Buffer access pattern hint.</param>
+        /// <param name="size">Initial capacity of the buffer in bytes.</param>
+        /// <returns>An empty buffer object.</returns>
+        IBuffer CreateBuffer(BufferAccessPattern pattern, long size);
+
+        /// <summary>
+        /// Enqueue a draw call.
+        /// </summary>
+        /// <param name="drawCall">The draw call to enqueue.</param>
         void Draw(DrawCall drawCall);
     }
+
+    [Obsolete("Use IDirectRendering instead.")]
+    public interface ITextureExtension : IDeviceContextExtension
+    {
+        /// <inheritdoc cref="IDirectRendering.CreateTexture(TextureType)"/>
+        ITexture CreateTexture(TextureType type);
+    }
 }

Dashboard.Common/Drawing/IImmediateMode.cs

@@ -1,5 +1,7 @@
+using System.Data;
 using System.Drawing;
 using System.Numerics;
+using System.Runtime.InteropServices;
 using Dashboard.Layout;
 using Dashboard.Pal;
 
@@ -7,8 +9,57 @@ namespace Dashboard.Drawing
 {
     public record struct RectangleDrawInfo(Vector2 Position, ComputedBox Box, Brush Fill, Brush? Border = null);
 
+    [StructLayout(LayoutKind.Explicit, Size = Size)]
+    public struct ImmediateVertex()
+    {
+        [field: FieldOffset(PosOffset)]
+        public Vector3 Position { get; init; }= Vector3.Zero;
+        
+        [field: FieldOffset(TexCoordsOffset)]
+        public Vector2 TexCoords { get; init; } = Vector2.Zero;
+        
+        [field: FieldOffset(ColorOffset)]
+        public Vector4 Color { get; init; } = Vector4.One;
+
+        public ImmediateVertex(Vector3 position, Vector2 texCoords, Vector4 color) : this()
+        {
+            Position = position;
+            TexCoords = texCoords;
+            Color = color;
+        }
+
+        public ImmediateVertex(Vector3 position, Vector2 texCoords, Color color) 
+            : this(
+                position,
+                texCoords,
+                new Vector4(color.R / 255f, color.G / 255f, color.B / 255f, color.A / 255f))
+        {
+        }
+
+        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);
+    }
+
+    public struct ImmediateDrawCall(MeshPrimitive primitive, ReadOnlyMemory<ImmediateVertex> vertices)
+    {
+        public MeshPrimitive Primitive { get; init; } = primitive;
+        public ReadOnlyMemory<ImmediateVertex> Vertices { get; init; } = vertices;
+        public PipelineState PipelineState { get; init; } = new PipelineState();
+        public Matrix4x4 Transforms { get; init; } = Matrix4x4.Identity;
+        public ITexture? Texture { get; init; } = null;
+    }
+
     public interface IImmediateMode : IDeviceContextExtension
     {
+        /// <summary>
+        /// Enqueue a draw with the immediate mode shader pipeline.
+        /// </summary>
+        /// <param name="call">Information about this draw call.</param>
+        void DrawImmediate(ImmediateDrawCall call);
+
+        // TODO: move these to their own extension?
         void Line(Vector2 a, Vector2 b, float width, float depth, Vector4 color);
         void Rectangle(Box2d rectangle, float depth, Vector4 color);
         void Rectangle(in RectangleDrawInfo rectangle);

Dashboard.Common/Drawing/IShader.cs

@@ -0,0 +1,21 @@
+using System.Collections.Immutable;
+
+namespace Dashboard.Drawing
+{
+    /// <summary>
+    /// Base interface for creating shader pipelines.
+    /// </summary>
+    public interface IShaderCreateInfo
+    {
+    }
+
+    public readonly record struct ShaderMappingProperty(string Name, int Index);
+
+    public interface IShader : IDisposable
+    {
+        public ImmutableList<ShaderMappingProperty> Attributes { get; }
+        public ImmutableList<ShaderMappingProperty> Uniforms { get; }
+        public ImmutableList<ShaderMappingProperty> Blocks { get; }
+        public ImmutableList<ShaderMappingProperty> Textures { get; }
+    }
+}

Dashboard.Common/Drawing/ITexture.cs

@@ -1,13 +1,7 @@
 using System.Drawing;
-using Dashboard.Pal;
 
 namespace Dashboard.Drawing
 {
-    public interface ITextureExtension : IDeviceContextExtension
-    {
-        ITexture CreateTexture(TextureType type);
-    }
-
     public enum TextureType
     {
         Texture1D,

Dashboard.Common/Drawing/Image.cs

@@ -30,7 +30,7 @@ namespace Dashboard.Drawing
             if (Textures.TryGetValue(dc, out ITexture? texture))
                 return texture;
 
-            ITextureExtension ext = dc.ExtensionRequire<ITextureExtension>();
+            IDirectRendering ext = dc.ExtensionRequire<IDirectRendering>();
             texture = ext.CreateTexture(Type);
             texture.SetStorage(Format, Width, Height, Depth, Levels);
             for (int i = 0; i < Levels; i++)

Dashboard.OpenGL/Drawing/DirectRendering.cs

@@ -6,22 +6,38 @@ using OpenTK.Graphics.OpenGL;
 
 namespace Dashboard.OpenGL.Drawing
 {
-    public class DirectRendering : IDirectRendering
+    public class DirectRendering : IDirectRendering, ITextureExtension
     {
-        public DeviceContext Context { get; private set; } = null!;
+        public GLDeviceContext Context { get; private set; } = null!;
         public string DriverName { get; } = "Dashboard OpenGL";
         public string DriverVendor { get; } = "Dashboard";
         public Version DriverVersion { get; } = new Version(0, 1);
         IContextBase IContextExtensionBase.Context => Context;
+        DeviceContext IContextExtensionBase<DeviceContext>.Context => Context;
+
+        public bool SupportsArbTextureStorage { get; private set; }
+        public bool SupportsAnisotropy { get; private set; }
 
         private int _vao = -1;
+        private List<GLTexture> _textures = new List<GLTexture>();
+
 
         public void Dispose()
         {
             GC.SuppressFinalize(this);
         }
 
-        public void Require(DeviceContext context) => Context = context;
+        public void Require(DeviceContext context)
+        {
+            Context = (GLDeviceContext)context;
+
+            SupportsArbTextureStorage = Context.DriverVersion >= new Version(4, 2) ||
+                                        Context.IsGLExtensionAvailable("GL_ARB_texture_storage");
+            SupportsAnisotropy = Context.DriverVersion >= new Version() ||
+                                 Context.IsGLExtensionAvailable("GL_EXT_texture_filter_anisotropic") ||
+                                 Context.IsGLExtensionAvailable("GL_ARB_texture_filter_anisotropic");
+        } 
+
         public void Require(IContextBase context) => Require((DeviceContext)context);
 
         public void Begin()
@@ -37,7 +53,7 @@ namespace Dashboard.OpenGL.Drawing
 
         }
 
-        public IShader CreatePipeline<T>(T createInfo) where T : IShaderCreateInfo
+        public IShader CreateShader<T>(T createInfo) where T : IShaderCreateInfo
         {
             int program = createInfo switch
             {
@@ -74,5 +90,24 @@ namespace Dashboard.OpenGL.Drawing
 
             }
         }
+
+        public GLTexture CreateTexture(TextureType type)
+        {
+            GLTexture texture = new GLTexture(this, type);
+            lock (_textures) _textures.Add(texture);
+            return texture;
+        }
+
+        internal void TextureDisposed(GLTexture texture)
+        {
+            lock (_textures) _textures.Remove(texture);
+        }
+
+        ITexture ITextureExtension.CreateTexture(TextureType type) => CreateTexture(type);
+
+        ITexture IDirectRendering.CreateTexture(TextureType type)
+        {
+            return CreateTexture(type);
+        }
     }
 }

Dashboard.OpenGL/Drawing/GLShader.cs

@@ -1,11 +1,133 @@
+using System.Collections.Immutable;
+using System.Security.Cryptography.X509Certificates;
 using Dashboard.Drawing;
+using OpenTK.Graphics.OpenGL;
 
 namespace Dashboard.OpenGL.Drawing
 {
-    public class GLShader(GLDeviceContext context, int handle) : IShader
+    public class GLShader : IShader
     {
-        public GLDeviceContext Context { get; } = context;
-        public int Handle { get; } = handle;
+        public GLDeviceContext Context { get; }
+        public int Handle { get; }
+
+        public ImmutableList<ShaderMappingProperty> Attributes { get; }
+
+        public ImmutableList<ShaderMappingProperty> Uniforms { get; }
+
+        public ImmutableList<ShaderMappingProperty> Blocks { get; }
+
+        public ImmutableList<ShaderMappingProperty> Textures { get; }
+
+        public GLShader(GLDeviceContext context, int handle)
+        {
+            Context = context;
+            Handle = handle;
+
+            List<ShaderMappingProperty> list = new List<ShaderMappingProperty>();
+            List<ShaderMappingProperty> list2 = new List<ShaderMappingProperty>();
+
+            int count = GL.GetProgrami(handle, ProgramProperty.ActiveAttributes);
+            for (int i = 0; i < count; i++)
+            {
+                list.Add(GetAttribute(handle, i));
+            }
+            Attributes = list.ToImmutableList();
+
+            list.Clear();
+            count = GL.GetProgrami(handle, ProgramProperty.ActiveUniforms);
+            for (int i = 0; i < count; i++)
+            {
+                var property = GetUniform(handle, i, out bool isSampler);
+                list.Add(property);
+                if (isSampler)
+                    list2.Add(property);
+            }
+            Uniforms = list.ToImmutableList();
+            Textures = list2.ToImmutableList();
+
+            list.Clear();
+            count = GL.GetProgrami(handle, ProgramProperty.ActiveUniformBlocks);
+            for (int i = 0; i < count; i++)
+            {
+                var property = GetBlock(handle, i);
+                list.Add(property);
+            }
+            Blocks = list.ToImmutableList();
+        }
+
+        private static ShaderMappingProperty GetAttribute(int program, int index)
+        {
+            string name = GL.GetActiveAttrib(program, (uint)index, 260, out _, out _, out _);
+            int location = GL.GetAttribLocation(program, name);
+
+            return new ShaderMappingProperty(name, location);
+        }
+
+        private static ShaderMappingProperty GetUniform(int program, int index, out bool isSampler)
+        {
+            string name = GL.GetActiveUniform(program, (uint)index, 260, out _,  out _, out OpenTK.Graphics.OpenGL.UniformType type);
+            int location = GL.GetUniformLocation(program, name);
+
+            isSampler = type switch
+            {
+                OpenTK.Graphics.OpenGL.UniformType.Sampler1D or 
+                OpenTK.Graphics.OpenGL.UniformType.Sampler1DArray or
+                OpenTK.Graphics.OpenGL.UniformType.Sampler1DShadow or
+                OpenTK.Graphics.OpenGL.UniformType.Sampler1DArrayShadow or
+                OpenTK.Graphics.OpenGL.UniformType.IntSampler1D or
+                OpenTK.Graphics.OpenGL.UniformType.IntSampler1DArray or
+                OpenTK.Graphics.OpenGL.UniformType.UnsignedIntSampler1D or
+                OpenTK.Graphics.OpenGL.UniformType.UnsignedIntSampler1DArray or
+                
+                OpenTK.Graphics.OpenGL.UniformType.Sampler2D or
+                OpenTK.Graphics.OpenGL.UniformType.Sampler2DShadow or
+                OpenTK.Graphics.OpenGL.UniformType.Sampler2DRect or
+                OpenTK.Graphics.OpenGL.UniformType.Sampler2DRectShadow or
+                OpenTK.Graphics.OpenGL.UniformType.Sampler2DArray or
+                OpenTK.Graphics.OpenGL.UniformType.Sampler2DArrayShadow or
+                OpenTK.Graphics.OpenGL.UniformType.Sampler2DMultisample or
+                OpenTK.Graphics.OpenGL.UniformType.Sampler2DMultisampleArray or
+                OpenTK.Graphics.OpenGL.UniformType.IntSampler2D or
+                OpenTK.Graphics.OpenGL.UniformType.IntSampler2DRect or
+                OpenTK.Graphics.OpenGL.UniformType.IntSampler2DArray or
+                OpenTK.Graphics.OpenGL.UniformType.IntSampler2DMultisample or
+                OpenTK.Graphics.OpenGL.UniformType.IntSampler2DMultisampleArray or
+                OpenTK.Graphics.OpenGL.UniformType.UnsignedIntSampler2D or
+                OpenTK.Graphics.OpenGL.UniformType.UnsignedIntSampler2DRect or
+                OpenTK.Graphics.OpenGL.UniformType.UnsignedIntSampler2DArray or
+                OpenTK.Graphics.OpenGL.UniformType.UnsignedIntSampler2DMultisample or
+                OpenTK.Graphics.OpenGL.UniformType.UnsignedIntSampler2DMultisampleArray or
+                
+                OpenTK.Graphics.OpenGL.UniformType.Sampler3D or
+                OpenTK.Graphics.OpenGL.UniformType.IntSampler3D or
+                OpenTK.Graphics.OpenGL.UniformType.UnsignedIntSampler3D or
+                OpenTK.Graphics.OpenGL.UniformType.SamplerCube or
+                OpenTK.Graphics.OpenGL.UniformType.SamplerCubeShadow or
+                OpenTK.Graphics.OpenGL.UniformType.SamplerCubeMapArray or
+                OpenTK.Graphics.OpenGL.UniformType.SamplerCubeMapArrayShadow or
+                OpenTK.Graphics.OpenGL.UniformType.IntSamplerCube or
+                OpenTK.Graphics.OpenGL.UniformType.IntSamplerCubeMapArray or
+                OpenTK.Graphics.OpenGL.UniformType.UnsignedIntSamplerCube or
+                OpenTK.Graphics.OpenGL.UniformType.UnsignedIntSamplerCubeMapArray
+                    => true,
+                _   => false,
+            };
+
+            return new ShaderMappingProperty(name, location);
+        }
+
+        private static ShaderMappingProperty GetBlock(int program, int index)
+        {
+            int size = 0;
+
+            unsafe
+            {
+                GL.GetActiveUniformBlockiv(program, (uint)index, UniformBlockPName.UniformBlockDataSize, &size);
+            }
+
+            GL.GetActiveUniformBlockName(program, (uint)index, 1024, out _, out string name);
+            return new ShaderMappingProperty(name, index);
+        }
 
         public void Dispose()
         {

Dashboard.OpenGL/Drawing/GLStateExtensions.cs

@@ -221,16 +221,12 @@ namespace Dashboard.OpenGL.Drawing
             }
         }
 
-        extension(DrawCall call)
+        extension(PipelineState state)
         {
-            public void UsePipeline() => GL.UseProgram((call.ShaderPipeline as GLShader)?.Handle ?? 0);
-
-            // TODO: clamp to viewport size
-
             public void SetViewport(Vector2 size)
             {
-                Vector2 min = Vector2.Max(Vector2.Zero, call.ViewportRegion.Min);
-                Vector2 max = Vector2.Min(size, call.ViewportRegion.Max);
+                Vector2 min = Vector2.Max(Vector2.Zero, state.ViewportRegion.Min);
+                Vector2 max = Vector2.Min(size, state.ViewportRegion.Max);
 
                 GL.Viewport(
                     (int)Math.Round(min.X),
@@ -239,9 +235,10 @@ namespace Dashboard.OpenGL.Drawing
                     (int)Math.Round(max.Y - min.Y));
             }
 
+            // TODO: clamp to viewport size
             public void SetScissor(Vector2 size)
             {
-                if (call.ScissorRegion == new Box2d(Vector2.PositiveInfinity, Vector2.PositiveInfinity))
+                if (state.ScissorRegion == new Box2d(Vector2.PositiveInfinity, Vector2.PositiveInfinity))
                 {
                     GL.Disable(EnableCap.ScissorTest);
                     return;
@@ -249,15 +246,15 @@ namespace Dashboard.OpenGL.Drawing
 
                 GL.Enable(EnableCap.ScissorTest);
                 GL.Scissor(
-                    (int)Math.Round(call.ViewportRegion.Left),
-                    (int)Math.Round(size.Y - call.ViewportRegion.Top),
-                    (int)Math.Round(call.ViewportRegion.Right - call.ViewportRegion.Left),
-                    (int)Math.Round(call.ViewportRegion.Bottom - call.ViewportRegion.Top));
+                    (int)Math.Round(state.ViewportRegion.Left),
+                    (int)Math.Round(size.Y - state.ViewportRegion.Top),
+                    (int)Math.Round(state.ViewportRegion.Right - state.ViewportRegion.Left),
+                    (int)Math.Round(state.ViewportRegion.Bottom - state.ViewportRegion.Top));
             }
 
             public void SetFrontFace()
             {
-                GL.FrontFace(call.FrontFace switch
+                GL.FrontFace(state.FrontFace switch
                 {
                     WindingOrder.Clockwise => FrontFaceDirection.Cw,
                     WindingOrder.Counterclockwise => FrontFaceDirection.Ccw,
@@ -267,7 +264,7 @@ namespace Dashboard.OpenGL.Drawing
 
             public void SetCullMode()
             {
-                if (call.CullMode == FaceCulling.None)
+                if (state.CullMode == FaceCulling.None)
                 {
                     GL.Disable(EnableCap.CullFace);
                     return;
@@ -275,7 +272,7 @@ namespace Dashboard.OpenGL.Drawing
 
                 GL.Enable(EnableCap.CullFace);
 
-                GL.CullFace(call.CullMode switch
+                GL.CullFace(state.CullMode switch
                 {
                     FaceCulling.Both => TriangleFace.FrontAndBack,
                     FaceCulling.Front => TriangleFace.Front,
@@ -284,9 +281,47 @@ namespace Dashboard.OpenGL.Drawing
                 });
             }
 
-            public void SetBlendMode() => call.BlendMode.SetAll();
-            public void SetDepthMode() => call.DepthMode.SetAll();
-            public void SetStencilMode() => call.StencilMode.SetAll();
+            public void SetBlendMode() => state.BlendMode.SetAll();
+            public void SetDepthMode() => state.DepthMode.SetAll();
+            public void SetStencilMode() => state.StencilMode.SetAll();
+
+            public void SetColorMask()
+            {
+                GL.ColorMask(state.RedMask, state.GreenMask, state.BlueMask, state.AlphaMask);
+            }
+
+            public void SetPointSize()
+            {
+                GL.PointSize(state.PointSize);
+            }
+
+            public void SetLineWidth()
+            {
+                GL.LineWidth(state.LineWidth);
+            }
+        }
+
+        extension(DrawCall call)
+        {
+            public void UsePipeline() => GL.UseProgram((call.ShaderPipeline as GLShader)?.Handle ?? 0);
+
+            public void SetViewport(Vector2 size) => call.PipelineState.SetViewport(size);
+
+            public void SetScissor(Vector2 size) => call.PipelineState.SetViewport(size);
+
+            public void SetFrontFace() => call.PipelineState.SetFrontFace();
+
+            public void SetCullMode() => call.PipelineState.SetCullMode();
+
+            public void SetBlendMode() => call.PipelineState.BlendMode.SetAll();
+            public void SetDepthMode() => call.PipelineState.DepthMode.SetAll();
+            public void SetStencilMode() => call.PipelineState.StencilMode.SetAll();
+
+            public void SetColorMask() => call.PipelineState.SetColorMask();
+
+            public void SetPointSize() => call.PipelineState.SetPointSize();
+
+            public void SetLineWidth() => call.PipelineState.SetLineWidth();
 
             public void SetPrimitiveRestart()
             {
@@ -300,21 +335,6 @@ namespace Dashboard.OpenGL.Drawing
                 GL.PrimitiveRestartIndex((uint)call.RestartIndex);
             }
 
-            public void SetColorMask()
-            {
-                GL.ColorMask(call.RedMask, call.GreenMask, call.BlueMask, call.AlphaMask);
-            }
-
-            public void SetPointSize()
-            {
-                GL.PointSize(call.PointSize);
-            }
-
-            public void SetLineWidth()
-            {
-                GL.LineWidth(call.LineWidth);
-            }
-
             public void UseTextures()
             {
                 int i = 0;

Dashboard.OpenGL/Drawing/GLTexture.cs

@@ -1,61 +1,12 @@
 using System.Drawing;
 using Dashboard.Drawing;
-using Dashboard.Pal;
+using Dashboard.OpenGL.Drawing;
 using OpenTK.Graphics.OpenGL;
 using OGL = OpenTK.Graphics.OpenGL;
 
 namespace Dashboard.OpenGL
 {
-    public class GLTextureExtension : ITextureExtension, IContextExtensionBase<GLDeviceContext>
-    {
-        public string DriverName => "Dashboard OpenGL Texture Extension";
-        public string DriverVendor => "Dashboard";
-        public Version DriverVersion => new Version(0, 1, 0);
-        public GLDeviceContext Context { get; private set; } = null!;
-        public bool SupportsArbTextureStorage { get; private set; }
-        public bool SupportsAnisotropy { get; private set; }
-
-        IContextBase IContextExtensionBase.Context => Context;
-        DeviceContext IContextExtensionBase<DeviceContext>.Context => Context;
-
-        private List<GLTexture> _textures = new List<GLTexture>();
-
-        public void Dispose()
-        {
-        }
-
-
-        public void Require(GLDeviceContext context)
-        {
-            Context = context;
-
-            SupportsArbTextureStorage = Context.DriverVersion >= new Version(4, 2) ||
-                                        Context.IsGLExtensionAvailable("GL_ARB_texture_storage");
-            SupportsAnisotropy = Context.DriverVersion >= new Version() ||
-                                 Context.IsGLExtensionAvailable("GL_EXT_texture_filter_anisotropic") ||
-                                 Context.IsGLExtensionAvailable("GL_ARB_texture_filter_anisotropic");
-        }
-        public void Require(DeviceContext context) => Require((GLDeviceContext)context);
-        public void Require(IContextBase context) => Require((GLDeviceContext)context);
-
-
-
-        public GLTexture CreateTexture(TextureType type)
-        {
-            GLTexture texture = new GLTexture(this, type);
-            lock (_textures) _textures.Add(texture);
-            return texture;
-        }
-
-        internal void TextureDisposed(GLTexture texture)
-        {
-            lock (_textures) _textures.Remove(texture);
-        }
-
-        ITexture ITextureExtension.CreateTexture(TextureType type) => CreateTexture(type);
-    }
-
-    public class GLTexture(GLTextureExtension extension, TextureType type) : ITexture
+    public class GLTexture(DirectRendering extension, TextureType type) : ITexture
     {
         public int Handle { get; private set; } = 0;
         public bool IsValid => Handle != 0;
@@ -87,7 +38,7 @@ namespace Dashboard.OpenGL
             _ => throw new NotSupportedException()
         };
 
-        private GLTextureExtension Extension { get; } = extension;
+        private DirectRendering Extension { get; } = extension;
         private GLDeviceContext Context => Extension.Context;
 
         ~GLTexture()

Dashboard.OpenGL/Drawing/ImmediateMode.cs

@@ -1,7 +1,10 @@
+using System.Diagnostics.CodeAnalysis;
 using System.Drawing;
 using System.Numerics;
 using System.Runtime;
+using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+using System.Security.Cryptography;
 using Dashboard.Drawing;
 using Dashboard.Pal;
 using OpenTK.Graphics.OpenGL;
@@ -16,14 +19,16 @@ namespace Dashboard.OpenGL.Drawing
 
         public DeviceContext Context { get; private set; } = null!;
 
-        private int _program;
+        private IDirectRendering _dr;
+        private GLShader _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;
+        private GLTexture _white;
 
         public void Dispose()
         {
@@ -32,43 +37,36 @@ namespace Dashboard.OpenGL.Drawing
         public void Require(DeviceContext context)
         {
             Context = context;
+            _dr = context.ExtensionRequire<IDirectRendering>();
 
-            _program = GL.CreateProgram();
+            GlslShaderCreateInfo shader;
 
-            int vs = GL.CreateShader(ShaderType.VertexShader);
-
-            using (StreamReader reader = new StreamReader(GetType().Assembly
+            using (StreamReader vertex = 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
+            using (StreamReader fragment = new StreamReader(GetType().Assembly
                        .GetManifestResourceStream("Dashboard.OpenGL.Drawing.immediate.frag")!))
             {
-                GL.ShaderSource(fs, reader.ReadToEnd());
+                shader = new GlslShaderCreateInfo()
+                {
+                    VertexShader = vertex.ReadToEnd(),
+                    FragmentShader = fragment.ReadToEnd(),   
+                };
             }
 
-            GL.CompileShader(fs);
-            GL.AttachShader(_program, fs);
+            _program = (GLShader)_dr.CreateShader(shader);
 
-            GL.LinkProgram(_program);
-            GL.DeleteShader(vs); GL.DeleteShader(fs);
+            _program_apos = (uint)GL.GetAttribLocation(_program.Handle, "aPos");
+            _program_atexcoord = (uint)GL.GetAttribLocation(_program.Handle, "aTexCoords");
+            _program_acolor = (uint)GL.GetAttribLocation(_program.Handle, "aColor");
 
-            _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.Handle, "transforms");
+            _program_image = GL.GetUniformLocation(_program.Handle, "image");
 
-            _program_transforms = GL.GetUniformLocation(_program, "transforms");
-            _program_image = GL.GetUniformLocation(_program, "image");
+            _white = (GLTexture)_dr.CreateTexture(TextureType.Texture2D);
+            _white.SetStorage(PixelFormat.Rgb8I, 1, 1, 1, 1);
             
-            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.BindTexture(TextureTarget.Texture2D, _white.Handle);
+            GL.TexSubImage2D(TextureTarget.Texture2D, 0, 0, 0, 1, 1, OpenTK.Graphics.OpenGL.PixelFormat.Rgb, PixelType.Byte, stackalloc byte[] { 0xFF, 0xFF, 0xFF, 0xFF });
             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);
@@ -113,10 +111,10 @@ namespace Dashboard.OpenGL.Drawing
 
             Matrix4x4 view = Context.ExtensionRequire<IDeviceContextBase>().Transforms;
 
-            GL.UseProgram(_program);
+            GL.UseProgram(_program.Handle);
 
             GL.ActiveTexture(TextureUnit.Texture0);
-            GL.BindTexture(TextureTarget.Texture2D, _white);
+            GL.BindTexture(TextureTarget.Texture2D, _white.Handle);
 
             GL.UniformMatrix4f(_program_transforms, 1, true, ref view);
             GL.Uniform1i(_program_image, 0);
@@ -152,10 +150,10 @@ namespace Dashboard.OpenGL.Drawing
 
             Matrix4x4 view = Context.ExtensionRequire<IDeviceContextBase>().Transforms;
 
-            GL.UseProgram(_program);
+            GL.UseProgram(_program.Handle);
 
             GL.ActiveTexture(TextureUnit.Texture0);
-            GL.BindTexture(TextureTarget.Texture2D, _white);
+            GL.BindTexture(TextureTarget.Texture2D, _white.Handle);
 
             GL.UniformMatrix4f(_program_transforms, 1, true, ref view);
             GL.Uniform1i(_program_image, 0);
@@ -204,7 +202,7 @@ namespace Dashboard.OpenGL.Drawing
             GL.EnableVertexAttribArray(_program_acolor);
             Matrix4x4 view = Context.ExtensionRequire<IDeviceContextBase>().Transforms;
 
-            GL.UseProgram(_program);
+            GL.UseProgram(_program.Handle);
 
             GL.ActiveTexture(TextureUnit.Texture0);
             GL.BindTexture(TextureTarget.Texture2D, ((GLTexture)texture).Handle);
@@ -224,17 +222,53 @@ namespace Dashboard.OpenGL.Drawing
             Require((DeviceContext)context);
         }
 
-        [StructLayout(LayoutKind.Explicit, Pack = sizeof(float) * 4, Size = Size)]
-        private struct ImmediateVertex(Vector3 position, Vector2 texCoords, Vector4 color)
+        public void DrawImmediate(ImmediateDrawCall call)
         {
-            [FieldOffset(PosOffset)]       public Vector3 Position = position;
-            [FieldOffset(TexCoordsOffset)] public Vector2 TexCoords = texCoords;
-            [FieldOffset(ColorOffset)]     public Vector4 Color = color;
+            // This is a terrible implementation as it stands but we can improve this immensely later on.
+            IDirectRendering dr = Context.ExtensionRequire<IDirectRendering>();
 
-            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);
+            int size = call.Vertices.Length * ImmediateVertex.Size;
+            
+            IBuffer buffer = dr.CreateBuffer(BufferAccessPattern.Stream, size);
+            buffer.Write(0, call.Vertices.Span);
+
+            VertexSpecification spec = CreateVertexSpec(buffer);
+            ReadOnlyMemory<byte> uniforms = MemoryMarshal.AsBytes(stackalloc Matrix4x4[] {call.Transforms}).ToArray();
+            
+            DrawCall drawCall = new DrawCall(call.Primitive, spec, 0, call.Vertices.Length)
+            {
+                ShaderPipeline = _program,
+                PipelineState = call.PipelineState,
+                UniformData = uniforms,
+                Uniforms = [
+                    new UniformDescriptor() { 
+                        Location = _program_transforms,
+                        Type =  Dashboard.Drawing.UniformType.Mat4,
+                        Offset = 0,
+                        Size = Unsafe.SizeOf<Matrix4x4>(),
+                    }
+                ],
+                Textures = [call.Texture ?? _white]
+            };
+
+            dr.Draw(drawCall);
+            buffer.Dispose();
+        }
+
+        private VertexSpecification CreateVertexSpec(IBuffer buffer)
+        {
+            return new VertexSpecification(
+                [
+                    new VertexAttribute((int)_program_apos, 3, VertexAttributeType.Float, ImmediateVertex.PosOffset, ImmediateVertex.Size),
+                    new VertexAttribute((int)_program_atexcoord, 2, VertexAttributeType.Float, ImmediateVertex.TexCoordsOffset, ImmediateVertex.Size),
+                    new VertexAttribute((int)_program_acolor, 4, VertexAttributeType.Float, ImmediateVertex.ColorOffset, ImmediateVertex.Size)
+                ],
+                [
+                    buffer,
+                    buffer,
+                    buffer
+                ]
+            );
         }
     }
 }

Dashboard.OpenGL/GLDeviceContext.cs

@@ -72,7 +72,6 @@ namespace Dashboard.OpenGL
             Extensions = extensions.ToImmutableHashSet();
 
             ExtensionPreload<DeviceContextBase>();
-            ExtensionPreload<GLTextureExtension>();
             ExtensionPreload<ImmediateMode>();
             ExtensionPreload<DirectRendering>();
         }

Dashboard.sln

@@ -9,7 +9,6 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "tests", "tests", "{9D6CCC74
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Dashboard.TestApplication", "tests\Dashboard.TestApplication\Dashboard.TestApplication.csproj", "{7C90B90B-DF31-439B-9080-CD805383B014}"
 	ProjectSection(ProjectDependencies) = postProject
-		{1BDFEF50-C907-42C8-B63B-E4F6F585CFB5} = {1BDFEF50-C907-42C8-B63B-E4F6F585CFB5}
 		{49A62F46-AC1C-4240-8615-020D4FBBF964} = {49A62F46-AC1C-4240-8615-020D4FBBF964}
 	EndProjectSection
 EndProject

tests/Dashboard.TestApplication/Program.cs

@@ -74,64 +74,21 @@ TK.Window.SetMode(window.WindowHandle, WindowMode.Normal);
 window.DeviceContext.ExtensionRequire<IDeviceContextBase>().ScaleOverride = 1.5f;
 
 IDirectRendering direct = window.DeviceContext.ExtensionRequire<IDirectRendering>();
-IBuffer vertex = direct.CreateBuffer(BufferAccessPattern.Static, 1024);
-float[] vertices = new float[]
-{   //  x,     y,     z,    _,    r, g, b, a
-        -0.5f, -0.5f, 0.0f, 0.0f, 1, 0, 0, 1,
-        +0.5f, -0.5f, 0.0f, 0.0f, 0, 1, 0, 1,
-        +0.0f, +0.5f, 0.0f, 0.0f, 0, 0, 1, 1,
+IImmediateMode imm = window.DeviceContext.ExtensionRequire<IImmediateMode>();
+ImmediateVertex[] vertices = new ImmediateVertex[]
+{                                                   //  x,     y,     z,                                                               r, g, b, a
+        new ImmediateVertex(new System.Numerics.Vector3(-0.5f, -0.5f, 0.0f), System.Numerics.Vector2.Zero, new System.Numerics.Vector4(1, 0, 0, 1)),
+        new ImmediateVertex(new System.Numerics.Vector3(+0.5f, -0.5f, 0.0f), System.Numerics.Vector2.Zero, new System.Numerics.Vector4(0, 1, 0, 1)),
+        new ImmediateVertex(new System.Numerics.Vector3(+0.0f, +0.5f, 0.0f), System.Numerics.Vector2.Zero, new System.Numerics.Vector4(0, 0, 1, 1)),
 };
-vertex.Write(0, vertices);
 
-IShader shader = direct.CreatePipeline(new GlslShaderCreateInfo()
-{
-    VertexShader =
-        """
-        #version 410
-        layout (location = 0) in vec3 apos;
-        layout (location = 1) in vec4 acolor;
-
-        out vec4 vcolor;
-
-        void main()
-        {
-            gl_Position = vec4(apos, 1);
-            vcolor = acolor;
-        }
-        """,
-    FragmentShader =
-        """
-         #version 410
-         in  vec4 vcolor;
-         out vec4 fcolor;
-
-         void main()
-         {
-            fcolor = vcolor;    
-         }
-
-         """,
-});
-
-VertexSpecification spec = new VertexSpecification(
-    [
-        new VertexAttribute(0, 3, VertexAttributeType.Float, 0, 8 * sizeof(float)),
-        new VertexAttribute(1, 4, VertexAttributeType.Float, 4 * sizeof(float), 8 * sizeof(float))
-    ],
-    [vertex, vertex]
-);
-
-DrawCall call = new DrawCall(MeshPrimitive.Triangle, spec, 0, 3)
-{
-    ShaderPipeline = shader
-};
 
 window.EventRaised += (sender, eventArgs) =>
 {
     if (eventArgs is not PaintEventArgs paint)
         return;
 
-    paint.DeviceContext.ExtensionRequire<IDirectRendering>().Draw(call);
+    imm.DrawImmediate(new ImmediateDrawCall(MeshPrimitive.Triangle, vertices.AsMemory()));
 };
 
 app.Run(true, source.Token);