Function initialize

examples/X11/X11.cpp:24–64

/////////////////////////////////////////////////////// Initialize OpenGL states into the specified view \param Window Target window to initialize \return True if operation was successful, false otherwise ///////////////////////////////////////////////////////

///
////////////////////////////////////////////////////////////
[[nodiscard]] bool initialize(sf::Window& window)
{
    // Activate the window
    if (!window.setActive())
    {
        std::cerr << "Failed to set the window as active" << std::endl;
        return false;
    }

    // Setup OpenGL states
    // Set color and depth clear value

#ifdef SFML_OPENGL_ES
    glClearDepthf(1.f);
#else
    glClearDepth(1.f);
#endif

    glClearColor(0.f, 0.5f, 0.5f, 0.f);

    // Enable Z-buffer read and write
    glEnable(GL_DEPTH_TEST);
    glDepthMask(GL_TRUE);

    // Setup a perspective projection
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    const float extent = std::tan(sf::degrees(45).asRadians());

#ifdef SFML_OPENGL_ES
    glFrustumf(-extent, extent, -extent, extent, 1.0f, 500.0f);
#else
    glFrustum(-extent, extent, -extent, extent, 1.0f, 500.0f);
#endif

    // Enable position and texture coordinates vertex components
    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_COLOR_ARRAY);

    return true;
}

////////////////////////////////////////////////////////////
/// Draw the OpenGL scene (a rotating cube) into