InvalidOperation in `OpenGL Tutorials/Tutorial 1.3 - Textures`

[bamfbamf]

Summary

I'm porting C++ code to Silk and found that my custom Shader class, when I do Shader.Use(), was reporting InvalidOperation error.
After debugging original code of the lesson I found that the error starts after _gl.Uniform1(location, 0); is set for texture, way before _gl.UseProgram(_program); is executed.
Original code doesn't check for error, so that's why it works.

Steps to reproduce

• Platform: Desktop Windows 10 v.22H2
• Framework Version: .NET 8
• API: OpenGL
• API Version: OpenGL 4.5+ Core

1. Open OpenGL Tutorials/Tutorial 1.3 - Textures example.
2. Add this code before _gl.Uniform1(location, 0); which is currently at line 275:

var errCode = _gl.GetError();
if (errCode != GLEnum.NoError)
{
    Console.WriteLine($"Before Uniform1(): {errCode}");
    _window.IsClosing = true;
    return;
}

3. Add this code after _gl.Uniform1(location, 0); which is currently at line 275:

errCode = _gl.GetError();
if (errCode != GLEnum.NoError)
{
    Console.WriteLine($"After Uniform1(): {errCode}");
    _window.IsClosing = true;
    return;
}

Comments

I'm not sure what causes the problem.