SymbolLoadingException

[courgeon]

Hello again,

I'm running into a Runtime problem (Windows 10 - VS2019 pro )

Here is my code

        var glfw = Glfw.GetApi();
        if (!glfw.Init())
            throw new Exception("Unable to initialize GLFW");

        var gl = GL.GetApi(glfw.Context);
        string v = gl.GetStringS(StringName.Version);

However, on the last line, I get a Runtime exception :

        Silk.NET.Core.Loader.SymbolLoadingException : 'Native symbol not found (Symbol: glGetString)'

I tried openning a window first with GLFW, and creating the context in various ways, but no luck.
Any suggestions ?

Thanks !

[courgeon]

Anyone with a working example of Silk.NET GLFW + OpenGL ?

[Perksey]

var gl = GL.GetApi(glfw.Context);

You're trying to use the context we use to load GLFW to load OpenGL functions, which won't work. Instead, you need to create a context which hooks into glfwGetProcAddress. Luckily, we've already done this for you. Try this line:

var gl = GL.GetApi(glfw, myCoolWindowPointer);

Where myCoolWindowPointer is obtained by glfw.CreateWindow. You can't create a GlfwContext until you have a window on-screen.

[Perksey]

Before the call use glfw.SetErrorCallback to find out what's happening

[courgeon]

Thank you for you help, it's really appreciated.

It does trigger the error callback

ErrorCode : NoContext
Description : Cannot query entry point without a current OpenGL or OpenGL ES context

[courgeon]

By the way, the window does popup. So GLFW seems to work fine. (if the GL calls are removed)

[courgeon]

Ok, figured it out, the context must be made current before creating the API

            var context = new GlfwContext(glfw, glfwWindow);
            context.MakeCurrent(); 
            var gl = GL.GetApi(context);

Thank you again !

[Perksey]

Ah yeah I forgot that Silk.NET.Windowing does that implicitly. Awesome!