Microsoft.Xna.Framework.Graphics.GraphicsExtensions.GetBoundTexture2D C# (CSharp) Method

        public static int GetBoundTexture2D()
        {
            var prevTexture = 0;
            GL.GetInteger(GetPName.TextureBinding2D, out prevTexture);
            GraphicsExtensions.LogGLError("GraphicsExtensions.GetBoundTexture2D() GL.GetInteger");
            return prevTexture;
        }

        private void PlatformSetData <T>(int level, int arraySlice, Rectangle rect, T[] data, int startIndex, int elementCount) where T : struct
        {
            Threading.BlockOnUIThread(() =>
            {
                var elementSizeInByte = ReflectionHelpers.SizeOf <T> .Get();
                var dataHandle        = GCHandle.Alloc(data, GCHandleType.Pinned);
                // Use try..finally to make sure dataHandle is freed in case of an error
                try
                {
                    var startBytes = startIndex * elementSizeInByte;
                    var dataPtr    = new IntPtr(dataHandle.AddrOfPinnedObject().ToInt64() + startBytes);
                    // Store the current bound texture.
                    var prevTexture = GraphicsExtensions.GetBoundTexture2D();

                    if (prevTexture != glTexture)
                    {
                        GL.BindTexture(TextureTarget.Texture2D, glTexture);
                        GraphicsExtensions.CheckGLError();
                    }

                    GenerateGLTextureIfRequired();
                    GL.PixelStore(PixelStoreParameter.UnpackAlignment, Math.Min(_format.GetSize(), 8));

                    if (glFormat == (PixelFormat)GLPixelFormat.CompressedTextureFormats)
                    {
                        GL.CompressedTexSubImage2D(TextureTarget.Texture2D, level, rect.X, rect.Y, rect.Width, rect.Height,
                                                   (PixelInternalFormat)glInternalFormat, elementCount * elementSizeInByte, dataPtr);
                    }
                    else
                    {
                        GL.TexSubImage2D(TextureTarget.Texture2D, level, rect.X, rect.Y,
                                         rect.Width, rect.Height, glFormat, glType, dataPtr);
                    }
                    GraphicsExtensions.CheckGLError();

#if !ANDROID
                    // Required to make sure that any texture uploads on a thread are completed
                    // before the main thread tries to use the texture.
                    GL.Finish();
                    GraphicsExtensions.CheckGLError();
#endif
                    // Restore the bound texture.
                    if (prevTexture != glTexture)
                    {
                        GL.BindTexture(TextureTarget.Texture2D, prevTexture);
                        GraphicsExtensions.CheckGLError();
                    }
                }
                finally
                {
                    dataHandle.Free();
                }
            });
        }