AA with SFML Shape

main.cpp

#include <SFML/Graphics.hpp>

int main()
{
    auto window = sf::RenderWindow(
        sf::VideoMode({400u, 400u}),
        "CMake SFML Project",
        sf::Style::Default,
        sf::State::Windowed,
        sf::ContextSettings{24, 8, 8});
    window.setFramerateLimit(144);

    auto shape = sf::CircleShape(5.f, 3);
    shape.setFillColor(sf::Color::Green);
    shape.setPosition({10.f, 10.f});
    shape.setOutlineColor(sf::Color::Red);
    shape.setOutlineThickness(1.f);

    auto renderTexture = sf::RenderTexture(
        {400u, 400u},
        sf::ContextSettings{24, 8, 8});

    renderTexture.clear();
    renderTexture.draw(shape);
    renderTexture.display();

    auto sprite = sf::Sprite(renderTexture.getTexture());
    shape.setPosition({30.f, 10.f});

    while (window.isOpen())
    {
        while (const std::optional event = window.pollEvent())
        {
            if (event->is<sf::Event::Closed>())
            {
                window.close();
            }
        }

        window.clear();
        window.draw(sprite);
        window.draw(shape);
        window.display();
    }
}