revert to VB and update to new project file format

Pilz.Drawing.Drawing3D.OpenGLRenderer/Rendering/ContentPipe.vb

@@ -0,0 +1,34 @@
+Imports System
+Imports OpenTK
+Imports OpenTK.Graphics.OpenGL
+Imports System.Drawing
+Imports System.Drawing.Imaging
+Imports Bitmap = System.Drawing.Bitmap
+
+Namespace RenderingN
+
+    Public Class ContentPipe
+
+        Public Shared Function LoadTexture(filepath As String) As Integer
+            Dim bitmap As New Bitmap(filepath)
+            Return LoadTexture(bitmap)
+        End Function
+
+        Public Shared Function LoadTexture(bitmap As Bitmap) As Integer
+            Dim id As Integer = GL.GenTexture()
+            LoadTexture(bitmap, id)
+            Return id
+        End Function
+
+        Public Shared Sub LoadTexture(bitmap As Bitmap, id As Integer)
+            Dim bmpData As BitmapData = bitmap.LockBits(New Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, Imaging.PixelFormat.Format32bppArgb)
+            GL.BindTexture(TextureTarget.Texture2D, id)
+            GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, bitmap.Width, bitmap.Height, 0, OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, bmpData.Scan0)
+            bitmap.UnlockBits(bmpData)
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, CInt(Math.Truncate(TextureMinFilter.Linear)))
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, CInt(Math.Truncate(TextureMagFilter.Linear)))
+        End Sub
+
+    End Class
+
+End Namespace