private void DrawWindow(string title, float x, float y, float w, float h)
{
const float cornerRadius = 3.0f;
_nvg.Save();
_nvg.BeginPath();
_nvg.RoundedRect(x, y, w, h, cornerRadius);
_nvg.FillColour(_nvg.Rgba(28, 30, 34, 192));
_nvg.Fill();
Paint shadowPaint = Paint.BoxGradient(x, y + 2.0f, w, h, cornerRadius * 2.0f, 10.0f, _nvg.Rgba(0, 0, 0, 128), _nvg.Rgba(0, 0, 0, 0));
_nvg.BeginPath();
_nvg.Rect(x - 10.0f, y - 10.0f, w + 20.0f, h + 30.0f);
_nvg.RoundedRect(x, y, w, h, cornerRadius);
_nvg.PathWinding(Solidity.Hole);
_nvg.FillPaint(shadowPaint);
_nvg.Fill();
Paint headerPaint = _nvg.LinearGradient(x, y, x, y + 15.0f, _nvg.Rgba(255, 255, 255, 8), _nvg.Rgba(0, 0, 0, 16));
_nvg.BeginPath();
_nvg.RoundedRect(x + 1.0f, y + 1.0f, w - 2.0f, 30.0f, cornerRadius - 1.0f);
_nvg.FillPaint(headerPaint);
_nvg.Fill();
_nvg.BeginPath();
_nvg.MoveTo(x + 0.5f, y + 0.5f + 30.0f);
_nvg.LineTo(x + 0.5f + w - 1.0f, y + 0.5f + 30.0f);
_nvg.StrokeColour(_nvg.Rgba(0, 0, 0, 30));
_nvg.Stroke();
_nvg.FontSize(15.0f);
_nvg.FontFace("sans-bold");
_nvg.TextAlign(Align.Centre | Align.Middle);
_nvg.FontBlur(2.0f);
_nvg.FillColour(_nvg.Rgba(0, 0, 0, 128));
_ = _nvg.Text(x + w / 2.0f, y + 16.0f + 1.0f, title);
_nvg.FontBlur(0);
_nvg.FillColour(_nvg.Rgba(220, 220, 220, 160));
_ = _nvg.Text(x + w / 2.0f, y + 16.0f, title);
_nvg.Restore();
}