Method update

examples/shader/Shader.cpp:169–195

{
public:
    void update(float time, float x, float y) override
    {
        m_shader.setUniform("edge_threshold", 1 - (x + y) / 2);

        // Render the updated scene to the off-screen surface
        m_surface.clear(sf::Color::White);

        sf::Sprite backgroundSprite{m_backgroundTexture};
        backgroundSprite.setPosition({135.f, 100.f});
        m_surface.draw(backgroundSprite);

        // Update the position of the moving entities
        constexpr int numEntities = 6;

        for (int i = 0; i < 6; ++i)
        {
            sf::Sprite entity{m_entityTexture, sf::IntRect({96 * i, 0}, {96, 96})};

            entity.setPosition(
                {std::cos(0.25f * (time * static_cast<float>(i) + static_cast<float>(numEntities - i))) * 300 + 350,
                 std::sin(0.25f * (time * static_cast<float>(numEntities - i) + static_cast<float>(i))) * 200 + 250});

            m_surface.draw(entity);
        }

        m_surface.display();
    }

    void draw(sf::RenderTarget& target, sf::RenderStates states) const override
    {