Convert some RLGL consts to Enums

Also added helper methods/overloads for related methods

Raylib-cs/Rlgl.cs

@@ -1,4 +1,5 @@
 using System;
+using System.ComponentModel;
 using System.Numerics;
 using System.Runtime.InteropServices;
 using System.Security;
@@ -40,15 +41,6 @@ namespace Raylib_cs
         public const int RL_TEXTURE_WRAP_MIRROR_REPEAT = 0x8370;
         public const int RL_TEXTURE_WRAP_MIRROR_CLAMP = 0x8742;
         
-        // Matrix modes (equivalent to OpenGL)
-        public const int RL_MODELVIEW = 0x1700;
-        public const int RL_PROJECTION = 0x1701;
-        public const int RL_TEXTURE = 0x1702;
-
-        // Primitive assembly draw modes
-        public const int RL_LINES = 0x0001;
-        public const int RL_TRIANGLES = 0x0004;
-        public const int RL_QUADS = 0x0007;
 
         // GL equivalent data types
         public const int RL_UNSIGNED_BYTE = 0x1401;
@@ -65,10 +57,6 @@ namespace Raylib_cs
         public const int RL_DYNAMIC_READ = 0x88E9;
         public const int RL_DYNAMIC_COPY = 0x88EA;
 
-        // GL Shader type
-        public const int RL_FRAGMENT_SHADER = 0x8B30;
-        public const int RL_VERTEX_SHADER = 0x8B31;
-        public const int RL_COMPUTE_SHADER = 0x91B9;
 
         // ------------------------------------------------------------------------------------
         // Functions Declaration - Matrix operations
@@ -78,6 +66,11 @@ namespace Raylib_cs
         [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
         public static extern void rlMatrixMode(int mode);
 
+        public static void rlMatrixMode(MatrixMode mode)
+        {
+            rlMatrixMode((int)mode);
+        }
+
         /// <summary>Push the current matrix to stack</summary>
         [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
         public static extern void rlPushMatrix();
@@ -125,6 +118,11 @@ namespace Raylib_cs
         [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
         public static extern void rlBegin(int mode);
 
+        public static void rlBegin(DrawMode mode)
+        {
+            rlBegin((int)mode);
+        }
+
         /// <summary>Finish vertex providing</summary>
         [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
         public static extern void rlEnd();
@@ -689,4 +687,117 @@ namespace Raylib_cs
         [DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
         public static extern void rlLoadDrawQuad();
     }
+
+    /// <summary>
+    /// Matrix Modes (equivalent to OpenGL)
+    /// </summary>
+    public enum MatrixMode : int
+    {
+        /// <summary>
+        /// GL_MODELVIEW
+        /// </summary>
+        MODELVIEW = 0x1700,
+        /// <summary>
+        /// GL_PROJECTION
+        /// </summary>
+        PROJECTION = 0x1701,
+        /// <summary>
+        /// GL_TEXTURE
+        /// </summary>
+        TEXTURE = 0x1702
+    }
+
+    /// <summary>
+    /// Primitive assembly draw modes
+    /// </summary>
+    public enum DrawMode : int
+    {
+        /// <summary>
+        /// GL_LINES
+        /// </summary>
+        LINES = 0x0001,
+        /// <summary>
+        /// GL_TRIANGLES
+        /// </summary>
+        TRIANGLES = 0x0004,
+        /// <summary>
+        /// GL_QUADS
+        /// </summary>
+        QUADS = 0x0007
+    }
+    
+    /// <summary>
+    /// Texture parameters (equivalent to OpenGL defines)
+    /// </summary>
+    public enum TextureFilters : int
+    {
+        /// <summary>
+        /// RL_TEXTURE_FILTER_NEAREST
+        /// <br/>
+        /// GL_NEAREST
+        /// </summary>
+        NEAREST = 0x2600,
+        /// <summary>
+        /// RL_TEXTURE_FILTER_LINEAR
+        /// <br/>
+        /// GL_LINEAR
+        /// </summary>
+        LINEAR = 0x2601,
+        /// <summary>
+        /// RL_TEXTURE_FILTER_MIP_NEAREST
+        /// <br/>
+        /// GL_NEAREST_MIPMAP_NEAREST
+        /// </summary>
+        MIP_NEAREST = 0x2700,
+        /// <summary>
+        /// RL_TEXTURE_FILTER_NEAREST_MIP_LINEAR
+        /// <br/>
+        /// GL_NEAREST_MIPMAP_LINEAR
+        /// </summary>
+        NEAREST_MIP_LINEAR = 0x2702,
+        /// <summary>
+        /// RL_TEXTURE_FILTER_LINEAR_MIP_NEAREST
+        /// <br/>
+        /// GL_LINEAR_MIPMAP_NEAREST
+        /// </summary>
+        LINEAR_MIP_NEAREST = 0x2701,
+        /// <summary>
+        /// RL_TEXTURE_FILTER_MIP_LINEAR
+        /// <br/>
+        /// GL_LINEAR_MIPMAP_LINEAR
+        /// </summary>
+        MIP_LINEAR = 0x2703,
+        /// <summary>
+        /// RL_TEXTURE_FILTER_ANISOTROPIC
+        /// <br/>
+        /// Anisotropic filter (custom identifier)
+        /// </summary>
+        ANISOTROPIC = 0x3000
+    }
+
+    /// <summary>
+    /// GL Shader type
+    /// </summary>
+    public enum ShaderType : int
+    {
+        /// <summary>
+        /// RL_FRAGMENT_SHADER
+        /// <br/>
+        /// GL_FRAGMENT_SHADER
+        /// </summary>
+        FRAGMENT = 0x8B30,
+        /// <summary>
+        /// RL_VERTEX_SHADER
+        /// <br/>
+        /// GL_VERTEX_SHADER
+        /// </summary>
+        VERTEX = 0x8B31,
+        /// <summary>
+        /// RL_COMPUTE_SHADER
+        /// <br/>
+        /// GL_COMPUTE_SHADER
+        /// </summary>
+        COMPUTE = 0x91b9
+    }
+
 }