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DotNet / OpenTK AccessViolationException on any OpenGL call

« on: May 27, 2015, 09:58:24 pm »

The simplest OpenGL calls through OpenTK are crashing with

An unhandled exception of type 'System.AccessViolationException' occurred in OpenTK.dll

Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Crashes with any combination of precompiled CSFML+.Net - 2.0, 2.1, 2.2 and with latest 2.3 git sources.
Also tried switching OpenTK from latest git version to precompiled binaries from OpenTK website - same crash.
Win7 and VS2015RC (I think it also crashed with 2013, can't say for sure).
NVidia 650TI, latest 352.86 (Witcher 3) drivers, same thing with 350.12 (GTAV) drivers. OpenGL - 4.5.
Also reported here on github by another fellow.

I also noticed that when you create a window with OpenTK the context has IsCurrent set to true, while with SFML it's false.

Minimal code, the beginning is a copy of Window example:

(click to show/hide)

using System;
using SFML.Window;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;

namespace MinimalTests
{
        internal static class SFMLTK
        {
                /// <summary>
                /// The main entry point for the application.
                /// </summary>
                private static void Main()
                {
                        // Request a 24-bits depth buffer when creating the window
                        ContextSettings contextSettings = new ContextSettings();
                        contextSettings.DepthBits = 24;

                        // Create the main window
                        Window window = new Window(new VideoMode(640, 480), "SFML window with OpenGL", Styles.Default, contextSettings);

                        // Make it the active window for OpenGL calls
                        window.SetActive();

                        // Initialize OpenTK
                        Toolkit.Init();
                        GraphicsContext context = new GraphicsContext(new ContextHandle(IntPtr.Zero), null);

                        // Try to get the vendor name and crash
                        Console.WriteLine(GL.GetString(StringName.Vendor));
                }
        }
}