private RenderTarget(Texture2D texture, TextureFormat format, TextureFlags flags)
{
handle = GraphicsContext.CreateFrameBuffer(texture, format, flags);
internal_texture = texture;
}
/// <summary>
/// Initializes a new instance of the <see cref="RenderTarget"/> struct.
/// </summary>
/// <param name="width">The width of the render target.</param>
/// <param name="height">The height of the render target.</param>
/// <param name="format">The format of the new surface.</param>
/// <param name="flags">Texture sampling flags.</param>
private RenderTarget(int width, int height, TextureFormat format, TextureFlags flags)
{
handle = GraphicsContext.CreateFrameBuffer(width, height, format, flags);
internal_texture = new Texture2D(GraphicsContext.GetFrameBufferTexture(handle, 0), width, height, false, false);
}