A minimalistic example to print text in a circle using SFML. (Example output: https://i.imgur.com/2M2OURz.png)

circletext.cpp

#include <SFML/Graphics.hpp>

int main(int argc, char **argv) {
    sf::RenderWindow window(sf::VideoMode(800, 600), "Circle Text", sf::Style::Default);
    window.setVerticalSyncEnabled(true);

    sf::Font font;
    font.loadFromFile("arial.ttf");
    
    sf::Text text("Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean ut ultrices ante. Aliquam ornare eu enim eget accumsan.", font);
    text.setPosition(400, 300);

    sf::Shader shader;
    shader.loadFromMemory(R"SHADER( void main() {

        // Let's define an angle depending on X coordinate.
        // This basically defines how "wrap around" the text is.
        // The correct factor depends on font, font size, etc.
        float a = gl_Vertex.x / 260;

        // Next we'll need the radius of our circle.
        // This is based on the text's baseline.
        float r = 200;

        // Calculate the new vertex coordinates.
        // Note how I completely ignore the original
        // X coordinate (it's included in a).
        gl_Vertex.x = (gl_Vertex.y + r) * sin(a);
        gl_Vertex.y = (gl_Vertex.y + r) * cos(a);

        gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
        gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
        gl_FrontColor = gl_Color;
 
    } )SHADER", sf::Shader::Vertex);

    sf::RenderStates states; states.shader = &shader;

    while (window.isOpen()) {
        sf::Event event;
        while (window.pollEvent(event)) {
            switch (event.type) {
            case sf::Event::Closed:
                window.close();
                break;
            }
        }

        window.clear(sf::Color(64, 127, 192));
        window.draw(text, states);
        window.display();
    }

    return 0;
}