Nullable fixes, use Texture2d resource for rendering directly.

DaggerFramework/Source/Resources/Texture2d.cs

@@ -2,10 +2,43 @@ namespace DaggerFramework
 {
     public class Texture2d : Resource
     {
+        /// <summary>
+        /// Internal handle for the texture. If it got successfully loaded into the GPU, the value will be other than -1.
+        /// </summary>
+        internal int Handle { get; set; } = -1;
         public int Width { get; set; }
         public int Height { get; set; }
+        public int Mipmaps { get; set; } = 1;
+        public TextureFormat Format { get; set; } = TextureFormat.UncompressedR8G8B8A8;
         public Texture2d(string path, byte[] buffer) : base(path, buffer)
         {
         }
+
+        public static Texture2d Empty => new Texture2d(string.Empty, new byte[] { });
+    }
+
+    public enum TextureFormat
+    {
+        UncompressedGrayscale = 1,
+        UncompressedGrayAlpha,
+        UncompressedR5G6B5,
+        UncompressedR8G8B8,
+        UncompressedR5G5B5A1,
+        UncompressedR4G4B4A4,
+        UncompressedR8G8B8A8,
+        UncompressedR32,
+        UncompressedR32G32B32,
+        UncompressedR32G32B32A32,
+        CompressedDXT1Rgb,
+        CompressedDXT1Rgba,
+        CompressedDXT3Rgba,
+        CompressedDXT5Rgba,
+        CompressedETC1Rgb,
+        CompressedETC2Rgb,
+        CompressedETC2EACRgba,
+        CompressedPVRTRgb,
+        CompressedPVRTRgba,
+        CompressedASTC4x4Rgba,
+        CompressedASTC8x8Rgba
     }
 }