Hi,
I'm from C/C++ world and now having troubles converting my old C++
code to C#

The OpenGL function is declared as
void glMultMatrixd( const GLdouble *m );
In C++, I use the code

//-------------------class definition
class CMatrix
{
public: double xx, yx, zx, x0;
     double xy, yy, zy, y0;
     double xz, yz, zz, z0;
     double px, py, pz, w1;
....
}

//--------------------using
CMatrix myMatrix
glMultMatrixd(&myMatrix.xx)

For C# I'm using the OpenGL wrapper from
http://nehe.gamedev.net/counter.asp?file=files/basecode/nehegl_csharp.zip

I'm trying to use it in such way:
//------------------------definition
namespace MyFormProject
{
    public class Matrix
    {
        public double  xx, yx, zx, x0,
                        xy, yy, zy, y0,
                    xz, yz, zz, z0,
                    px, py, pz, w1;
....
      }
}

// -----------------------------wrapper imports OpenGL functions
[DllImport(GL_DLL,EntryPoint ="glMultMatrixd")]
public static extern void glMultMatrixd(double[] m);

// ----------------------using
private unsafe void Draw(Matrix m)
{
   fixed (double* d = &m.xx)
   {
       GL.glMultMatrixd (d); // compiler error!
   }
}

This causes the compiler error "Cannot convert double * to double []".
How to do it correctly?

Thanx in advance
Roman.