为什么我不能在C#中使用OpenGL设置纹理包裹参数？(SharpGL dll)

using SharpGL;
using System;
using System.Runtime.InteropServices;

// ...

// 初始化OpenGL上下文
private void InitializeOpenGL()
{
    // ...
}

// 设置纹理包裹参数
private void SetTextureWrapping()
{
    // 获取OpenGL函数入口
    IntPtr glLibrary = NativeMethods.LoadLibrary("opengl32.dll");
    NativeMethods.GetProcAddress(glLibrary, "glTexParameteri", out IntPtr glTexParameteriPtr);
    var glTexParameteri = Marshal.GetDelegateForFunctionPointer<NativeMethods.GlTexParameteriDelegate>(glTexParameteriPtr);

    // 设置纹理包裹参数
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
}

// ...

// NativeMethods类用于导入OpenGL函数
private static class NativeMethods
{
    public delegate void GlTexParameteriDelegate(uint target, uint pname, int param);

    [DllImport("kernel32.dll")]
    public static extern IntPtr LoadLibrary(string dllToLoad);

    [DllImport("kernel32.dll")]
    public static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);
}

// 定义OpenGL常量
private const uint GL_TEXTURE_2D = 0x0DE1;
private const uint GL_TEXTURE_WRAP_S = 0x2802;
private const uint GL_TEXTURE_WRAP_T = 0x2803;