public class glu

    {

        private const string GLUDLLName="GLU32.DLL";

        public const int TESS_BEGIN = 100100;

        public const int TESS_VERTEX = 100101;

        public const int TESS_END = 100102;

        public const int TESS_ERROR = 100103;

        public const int TESS_COMBINE = 100105;

        public const int TESS_WINDING_RULE = 100140;

        public const int TESS_WINDING_ODD = 100130;

        public const int TESS_WINDING_NONZERO = 100131;

        public const int TESS_WINDING_POSITIVE = 100132;

        public const int TESS_WINDING_NEGATIVE = 100133;

        public const int TESS_WINDING_ABS_GEQ_TWO = 100134;

 

        [StructLayout(LayoutKind.Sequential)]

        public struct Tesselator

        {

            /// Keeps the struct from being garbage collected prematurely.

            private IntPtr Data;

        }

 

        public delegate void TessBeginCallback(int type);

        public delegate void TessEndCallback();

        public delegate void TessVertexCallback([MarshalAs(UnmanagedType.LPArray, SizeConst = 3)] double[] vertexData);

        public delegate void TessErrorCallback(int errorCode);

        public delegate void TessCombineCallback([In, MarshalAs(UnmanagedType.LPArray, SizeConst = 3)] double[] coordinates, [In, MarshalAs(UnmanagedType.LPArray, SizeConst = 4)] double[] vertexData, [In, MarshalAs(UnmanagedType.LPArray, SizeConst = 4)] float[] weight, ref double[] outData);

 

        /// local copy of the degates, prevents the GC from collecting them

        private static TessBeginCallback _tessBeginCallback;

        private static TessEndCallback _tessEndCallback;

        private static TessVertexCallback _tessVertexCallback;

        private static TessErrorCallback _tessErrorCallback;

        private static TessCombineCallback _tessCombineCallback;

 

       

        [DllImport(GLUDLLName, EntryPoint = "gluErrorString")]        

        private static extern IntPtr ErrorString_(int errCode);

 

        [DllImport(GLUDLLName, EntryPoint = "gluGetString")]

        private static extern IntPtr GetString_(int errCode);

                     

        [DllImport(GLUDLLName, EntryPoint = "gluOrtho2D")]

        public static extern void Ortho2D(double left, double right, double bottom,double top);

       

        [DllImport(GLUDLLName, EntryPoint = "gluPerspective")]

        public static extern void Perspective(double fovy, double aspect, double zNear,double zFar);

 

        [DllImport(GLUDLLName, EntryPoint = "gluPickMatrix")]

        public static extern void PickMatrix(double x, double y, double width,double height, int[] viewport);

       

        [DllImport(GLUDLLName, EntryPoint = "gluLookAt")]

        public static extern void LookAt(double eyex, double eyey, double eyez,double centerx,double centery,double centerz,double upx, double upy, double upz);

       

        [DllImport(GLUDLLName, EntryPoint = "gluProject")]

        public static extern void Project(double objx, double objy, double objz, double[] modelMatrix, double[] projMatrix, int[] viewport, out double winx, out double winy, out double winz);

 

        [DllImport(GLUDLLName, EntryPoint = "gluUnProject")]

        public static extern void UnProject(double winx, double winy, double winz, double[] modelMatrix, double[] projMatrix, int[] viewport, out double objx, out double objy, out double objz);

 

        [DllImport(GLUDLLName, EntryPoint = "ScaleImage")]

        public static extern void ScaleImage(int format, int widthin, int heightin,int typein, IntPtr datain, int widthout, int heightout, int typeout, IntPtr dataout);

       

        [DllImport(GLUDLLName, EntryPoint = "gluBuild1DMipmaps")]

        public static extern int Build1DMipmaps(int target, int components, int width, int format, int type, IntPtr data);

 

        [DllImport(GLUDLLName, EntryPoint = "gluBuild2DMipmaps")]

        public static extern int Build2DMipmaps(int target, int components, int width, int height, int format, int type, IntPtr data);

 

        [DllImport(GLUDLLName, EntryPoint = "gluNewTess")]

        public static extern Tesselator NewTess();

 

        [DllImport(GLUDLLName, EntryPoint = "gluTessCallback")]

        private static extern void _TessCallback(Tesselator tess, int which, TessBeginCallback func);

 

        public static void TessCallback(Tesselator tess, int which, TessBeginCallback func)

        {

            _tessBeginCallback = func;

            _TessCallback(tess, which, _tessBeginCallback);

        }

 

        [DllImport(GLUDLLName, EntryPoint = "gluTessCallback")]

        private static extern void _TessCallback(Tesselator tess, int which, TessEndCallback func);

 

        public static void TessCallback(Tesselator tess, int which, TessEndCallback func)

        {

            _tessEndCallback = func;

            _TessCallback(tess, which, _tessEndCallback);

        }

 

        [DllImport(GLUDLLName, EntryPoint = "gluTessCallback")]

        private static extern void _TessCallback(Tesselator tess, int which, TessVertexCallback func);

 

        public static void TessCallback(Tesselator tess, int which, TessVertexCallback func)

        {

            _tessVertexCallback = func;

            _TessCallback(tess, which, _tessVertexCallback);

        }

 

        [DllImport(GLUDLLName, EntryPoint = "gluTessCallback")]

        private static extern void _TessCallback(Tesselator tess, int which, TessErrorCallback func);

 

        public static void TessCallback(Tesselator tess, int which, TessErrorCallback func)

        {

            _tessErrorCallback = func;

            _TessCallback(tess, which, _tessErrorCallback);

        }

 

        [DllImport(GLUDLLName, EntryPoint = "gluTessCallback")]

        private static extern void _TessCallback(Tesselator tess, int which, TessCombineCallback func);

 

        public static void TessCallback(Tesselator tess, int which, TessCombineCallback func)

        {

            _tessCombineCallback = func;

            _TessCallback(tess, which, _tessCombineCallback);

        }

 

        [DllImport(GLUDLLName, EntryPoint = "gluTessBeginPolygon")]

        public static extern void TessBeginPolygon(Tesselator tess, double[] data);

 

        [DllImport(GLUDLLName, EntryPoint = "gluTessEndPolygon")]

        public static extern void TessEndPolygon(Tesselator tess);

 

        [DllImport(GLUDLLName, EntryPoint = "gluTessBeginContour")]

        public static extern void TessBeginContour(Tesselator tess);

 

        [DllImport(GLUDLLName, EntryPoint = "gluTessEndContour")]

        public static extern void TessEndContour(Tesselator tess);

 

        [DllImport(GLUDLLName, EntryPoint = "gluTessVertex")]

        public static extern void TessVertex(Tesselator tess, double[] location,  double[] data);

 

        [DllImport(GLUDLLName, EntryPoint = "gluTessProperty")]

        public static extern void TessProperty(Tesselator tess, int which, double data);

 

 

        public static string GetString(int name)

        {

            IntPtr i = GetString_(name);

            return Marshal.PtrToStringAnsi(i);

        }

        public static string ErrorString(int name)

        {

            IntPtr i = ErrorString_(name);

            return Marshal.PtrToStringAnsi(i);

        }

   

    }