all downhill from here

.gitignore

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+bin/
+obj/
+/packages/
+riderModule.iml
+/_ReSharper.Caches/

before.bat

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+xcopy "C:\Users\richard may clarkson\RiderProjects\shdr\shdr\Resource" "C:\Users\richard may clarkson\RiderProjects\shdr\shdr\bin\Debug\net6.0\Resource" /E /H /C /R /Q /Y
+xcopy "C:\Users\richard may clarkson\RiderProjects\shdr\shdr\Resource" "C:\Users\richard may clarkson\RiderProjects\shdr\shdr\bin\Release\net6.0\Resource" /E /H /C /R /Q /Y

global.json

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+{
+  "sdk": {
+    "version": "6.0.0",
+    "rollForward": "latestMajor",
+    "allowPrerelease": true
+  }
+}

shdr.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "shdr", "shdr\shdr.csproj", "{5F7BB6FD-5D0B-4E3A-8D87-295F9802F734}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{5F7BB6FD-5D0B-4E3A-8D87-295F9802F734}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5F7BB6FD-5D0B-4E3A-8D87-295F9802F734}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5F7BB6FD-5D0B-4E3A-8D87-295F9802F734}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5F7BB6FD-5D0B-4E3A-8D87-295F9802F734}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

shdr.sln.DotSettings.user

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+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/PredefinedNamingRules/=Method/@EntryIndexedValue">&lt;Policy Inspect="True" Prefix="" Suffix="" Style="aa_bb" /&gt;</s:String>
+	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/PredefinedNamingRules/=TypesAndNamespaces/@EntryIndexedValue">&lt;Policy Inspect="True" Prefix="__" Suffix="" Style="aa_bb" /&gt;</s:String>
+	<s:String x:Key="/Default/Environment/AssemblyExplorer/XmlDocument/@EntryValue">&lt;AssemblyExplorer&gt;&#xD;
+  &lt;Assembly Path="C:\Users\richard may clarkson\RiderProjects\shdr\shdr\bin\Debug\net6.0\NAudio.Core.dll" /&gt;&#xD;
+&lt;/AssemblyExplorer&gt;</s:String></wpf:ResourceDictionary>

shdr/Engine/Fbo.cs

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+using OpenTK.Graphics.OpenGL4;
+
+namespace shdr.Engine
+{
+   public class __fbo
+   {
+      private static int _active;
+      private static readonly Dictionary<int, __fbo> _frames = new();
+      private readonly bool _useDepth;
+      private int _colorAttachment;
+      private int _depthAttachment;
+      public int handle;
+      private int _height;
+      private int _width;
+
+      public __fbo(int width, int height)
+      {
+         _width = width;
+         _height = height;
+         _useDepth = false;
+         handle = -1;
+         init();
+         _frames[handle] = this;
+      }
+
+      public __fbo(int width, int height, bool useDepth)
+      {
+         _width = width;
+         _height = height;
+         _useDepth = useDepth;
+         handle = -1;
+         init();
+         _frames[handle] = this;
+      }
+
+      private void dispose()
+      {
+         GL.DeleteFramebuffer(handle);
+         GL.DeleteTexture(_colorAttachment);
+         if (_useDepth) GL.DeleteTexture(_depthAttachment);
+      }
+
+      private void init()
+      {
+         if (handle != -1) dispose();
+
+         handle = GL.GenFramebuffer();
+         bind();
+         _colorAttachment = GL.GenTexture();
+         GL.BindTexture(TextureTarget.Texture2D, _colorAttachment);
+         GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
+         GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
+         GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS,
+            (int)TextureWrapMode.ClampToBorder);
+         GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT,
+            (int)TextureWrapMode.ClampToBorder);
+         GL.TexStorage2D(TextureTarget2d.Texture2D, 1, SizedInternalFormat.Rgba8, _width, _height);
+         GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0,
+            TextureTarget.Texture2D, _colorAttachment, 0);
+         if (_useDepth)
+         {
+            _depthAttachment = GL.GenTexture();
+            GL.BindTexture(TextureTarget.Texture2D, _depthAttachment);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter,
+               (int)TextureMinFilter.Nearest);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter,
+               (int)TextureMagFilter.Nearest);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureCompareMode,
+               (int)TextureCompareMode.None);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS,
+               (int)TextureWrapMode.ClampToEdge);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT,
+               (int)TextureWrapMode.ClampToEdge);
+            GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.DepthComponent, _width, _height, 0,
+               PixelFormat.DepthComponent, PixelType.UnsignedInt, IntPtr.Zero);
+            GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment,
+               TextureTarget.Texture2D, _depthAttachment, 0);
+         }
+
+         FramebufferErrorCode status = GL.CheckFramebufferStatus(FramebufferTarget.Framebuffer);
+         if (status != FramebufferErrorCode.FramebufferComplete)
+            throw new Exception(
+               $"Incomplete Framebuffer! {status} should be {FramebufferErrorCode.FramebufferComplete}");
+
+         unbind();
+      }
+
+      private void _resize(int width, int height)
+      {
+         _width = width;
+         _height = height;
+         init();
+      }
+
+      public static void resize(int width, int height)
+      {
+         foreach (KeyValuePair<int, __fbo> frame in _frames) frame.Value._resize(width, height);
+      }
+
+      public void bind_color(TextureUnit unit)
+      {
+         GL.ActiveTexture(unit);
+         GL.BindTexture(TextureTarget.Texture2D, _colorAttachment);
+      }
+
+      public int bind_depth(TextureUnit unit)
+      {
+         if (!_useDepth) throw new Exception("Trying to bind depth texture of a framebuffer without depth!");
+         GL.ActiveTexture(unit);
+         GL.BindTexture(TextureTarget.Texture2D, _depthAttachment);
+         return _depthAttachment;
+      }
+
+      public void bind()
+      {
+         if (handle == _active) return;
+         GL.BindFramebuffer(FramebufferTarget.Framebuffer, handle);
+         _active = handle;
+      }
+
+      public void blit(int handle = 0)
+      {
+         GL.BindFramebuffer(FramebufferTarget.ReadFramebuffer, this.handle);
+         GL.BindFramebuffer(FramebufferTarget.DrawFramebuffer, handle);
+         GL.BlitFramebuffer(0, 0, _width, _height, 0, 0, _width, _height, ClearBufferMask.ColorBufferBit,
+            BlitFramebufferFilter.Nearest);
+         unbind();
+      }
+
+      public static void unbind()
+      {
+         GL.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
+         _active = 0;
+      }
+   }
+}