public static Texture2D renderText(SpriteFont font, string text, Color color)
        {

            GraphicsDevice graphic_device = Game.instance.GraphicsDevice;
            Vector2 text_size = font.MeasureString(text);
            RenderTarget2D output_texture = new RenderTarget2D(graphic_device,1024,1024);
            RenderTargetBinding[] oldTargets = graphic_device.GetRenderTargets();
            graphic_device.SetRenderTarget(output_texture);
            graphic_device.Clear(Color.Transparent);

            SpriteBatch spriteBatch = new SpriteBatch(graphic_device);
            spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend, SamplerState.LinearWrap, null, null);

            spriteBatch.DrawString(font, text, Vector2.Zero, color);

            spriteBatch.End();
            spriteBatch.Dispose();
            graphic_device.SetRenderTargets(oldTargets);

            return output_texture;
        }