untie the engine from SDL2 and MiniTK

OpenRA.Platforms.Default/ErrorHandler.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Diagnostics;
+using OpenTK.Graphics.OpenGL;
+
+namespace OpenRA.Platforms.Default
+{
+	public static class ErrorHandler
+	{
+		public static void CheckGlVersion()
+		{
+			var versionString = GL.GetString(StringName.Version);
+			var version = versionString.Contains(" ") ? versionString.Split(' ')[0].Split('.') : versionString.Split('.');
+
+			var major = 0;
+			if (version.Length > 0)
+				int.TryParse(version[0], out major);
+
+			var minor = 0;
+			if (version.Length > 1)
+				int.TryParse(version[1], out minor);
+
+			Console.WriteLine("Detected OpenGL version: {0}.{1}".F(major, minor));
+			if (major < 2)
+			{
+				WriteGraphicsLog("OpenRA requires OpenGL version 2.0 or greater and detected {0}.{1}".F(major, minor));
+				throw new InvalidProgramException("OpenGL Version Error: See graphics.log for details.");
+			}
+		}
+
+		public static void CheckGlError()
+		{
+			var n = GL.GetError();
+			if (n != ErrorCode.NoError)
+			{
+				var error = "GL Error: {0}\n{1}".F(n, new StackTrace());
+				WriteGraphicsLog(error);
+				throw new InvalidOperationException("OpenGL Error: See graphics.log for details.");
+			}
+		}
+
+		public static void WriteGraphicsLog(string message)
+		{
+			Log.Write("graphics", message);
+			Log.Write("graphics", "");
+			Log.Write("graphics", "OpenGL Information:");
+			Log.Write("graphics", "Vendor: {0}", GL.GetString(StringName.Vendor));
+			if (GL.GetString(StringName.Vendor).Contains("Microsoft"))
+			{
+				var msg = "";
+				msg += "Note:  The default driver provided by Microsoft does not include full OpenGL support.\n";
+				msg += "Please install the latest drivers from your graphics card manufacturer's website.\n";
+				Log.Write("graphics", msg);
+			}
+
+			Log.Write("graphics", "Renderer: {0}", GL.GetString(StringName.Renderer));
+			Log.Write("graphics", "GL Version: {0}", GL.GetString(StringName.Version));
+			Log.Write("graphics", "Shader Version: {0}", GL.GetString(StringName.ShadingLanguageVersion));
+			Log.Write("graphics", "Available extensions:");
+			Log.Write("graphics", GL.GetString(StringName.Extensions));
+		}
+	}
+}