diff --git a/Tetrahedrons/Gl4Window.cs b/Tetrahedrons/Gl4Window.cs
new file mode 100644
index 0000000..838b188
--- /dev/null
+++ b/Tetrahedrons/Gl4Window.cs
@@ -0,0 +1,101 @@
+using System;
+using System.Drawing;
+using System.IO;
+using OpenTK;
+using OpenTK.Graphics.OpenGL;
+
+namespace Tetrahedrons
+{
+   internal class Gl4Window : GameWindow
+   {
+      private int _pgm;
+
+      private int _shVs;
+      private int _shFs;
+
+      private int _bufVerts;
+      private int _bufInds;
+
+      private Vector4[] _datVerts;
+      private int[] _datInds;
+
+      protected override void OnLoad(EventArgs e)
+      {
+         base.OnLoad(e);
+
+         X = (DisplayDevice.Default.Width - Width) / 2;
+         Y = (DisplayDevice.Default.Height - Height) / 2;
+
+         _pgm = GL.CreateProgram();
+
+         _shVs = GL.CreateShader(ShaderType.VertexShader);
+         GL.ShaderSource(_shVs, File.ReadAllText("Shaders/simple.vert"));
+         GL.CompileShader(_shVs);
+         GL.AttachShader(_pgm, _shVs);
+         Console.WriteLine(GL.GetShaderInfoLog(_shVs));
+
+         _shFs = GL.CreateShader(ShaderType.FragmentShader);
+         GL.ShaderSource(_shFs, File.ReadAllText("Shaders/simple.frag"));
+         GL.CompileShader(_shFs);
+         GL.AttachShader(_pgm, _shFs);
+         Console.WriteLine(GL.GetShaderInfoLog(_shFs));
+
+         GL.LinkProgram(_pgm);
+         Console.WriteLine(GL.GetProgramInfoLog(_pgm));
+
+         _bufVerts = GL.GenBuffer();
+         _bufInds = GL.GenBuffer();
+
+         _datVerts = new[]
+         {
+            new Vector4(+1, -1, -1, -1) / 2,
+            new Vector4(-1, +1, -1, -1) / 2,
+            new Vector4(-1, -1, +1, -1) / 2,
+            new Vector4(-1, -1, -1, +1) / 2,
+            new Vector4(+1, +1, +1, +1) / 2
+         };
+
+         _datInds = new[]
+         {
+            0, 1, 2,
+            0, 1, 3,
+            0, 2, 3,
+            1, 2, 3
+         };
+      }
+
+
+      protected override void OnRenderFrame(FrameEventArgs e)
+      {
+         base.OnRenderFrame(e);
+         GL.Viewport(0, 0, Width, Height);
+         GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
+         GL.Enable(EnableCap.DepthTest);
+
+         GL.EnableVertexAttribArray(0);
+
+         GL.DrawElements(BeginMode.Triangles, _datInds.Length, DrawElementsType.UnsignedInt, 0);
+
+         GL.DisableVertexAttribArray(0);
+
+         GL.Flush();
+         SwapBuffers();
+      }
+
+      protected override void OnUpdateFrame(FrameEventArgs e)
+      {
+         base.OnUpdateFrame(e);
+
+         GL.BindBuffer(BufferTarget.ArrayBuffer, _bufVerts);
+         GL.BufferData(BufferTarget.ArrayBuffer, (IntPtr) (_datVerts.Length * Vector4.SizeInBytes), _datVerts, BufferUsageHint.StaticDraw);
+         GL.VertexAttribPointer(0, 4, VertexAttribPointerType.Float, false, 0, 0);
+
+         GL.UseProgram(_pgm);
+
+         GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
+
+         GL.BindBuffer(BufferTarget.ElementArrayBuffer, _bufInds);
+         GL.BufferData(BufferTarget.ElementArrayBuffer, (IntPtr) (_datInds.Length * sizeof(int)), _datInds, BufferUsageHint.StaticDraw);
+      }
+   }
+}
\ No newline at end of file
diff --git a/Tetrahedrons/Program.cs b/Tetrahedrons/Program.cs
index e2f16f6..04abcc0 100644
--- a/Tetrahedrons/Program.cs
+++ b/Tetrahedrons/Program.cs
@@ -7,8 +7,11 @@ namespace Tetrahedrons
    {
       public static void Main(string[] args)
       {
-         using (var p = new TetrahedronWindow())
+         using (var p = new Gl4Window())
             p.Run();
+         
+//         using (var p = new TetrahedronWindow())
+//            p.Run();
       }
    }
 }
\ No newline at end of file
diff --git a/Tetrahedrons/Shaders/simple.frag b/Tetrahedrons/Shaders/simple.frag
new file mode 100644
index 0000000..9d7cb73
--- /dev/null
+++ b/Tetrahedrons/Shaders/simple.frag
@@ -0,0 +1,9 @@
+#version 330
+
+out vec4 outputColor;
+
+void
+main()
+{
+    outputColor = vec4(1);
+}
diff --git a/Tetrahedrons/Shaders/simple.vert b/Tetrahedrons/Shaders/simple.vert
new file mode 100644
index 0000000..217416d
--- /dev/null
+++ b/Tetrahedrons/Shaders/simple.vert
@@ -0,0 +1,8 @@
+#version 330
+
+in vec3 vPosition;
+
+void main()
+{
+    gl_Position = vec4(vPosition.xyz, 1);
+}
\ No newline at end of file
diff --git a/Tetrahedrons/Tetrahedrons.csproj b/Tetrahedrons/Tetrahedrons.csproj
index 546af1a..1d79c3e 100644
--- a/Tetrahedrons/Tetrahedrons.csproj
+++ b/Tetrahedrons/Tetrahedrons.csproj
@@ -42,6 +42,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Gl4Window.cs" />
     <Compile Include="MVec4D.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
@@ -53,6 +54,14 @@
     <None Include="OpenTK.dll.config" />
     <None Include="packages.config" />
   </ItemGroup>
+  <ItemGroup>
+    <Content Include="Shaders\simple.frag">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </Content>
+    <Content Include="Shaders\simple.vert">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
          Other similar extension points exist, see Microsoft.Common.targets.