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General / Segmentation Fault on .Clear

« on: April 24, 2010, 07:20:22 pm »

Hi! I stumbled upon this project and decided to give it a try, it seems pretty good but I have had loads of trouble getting it to work.

My system is Ubuntu 9.4.

I followed the tutorial instructions for installing 1.6, but that didn't work so I installed from the Ubuntu repositories, which are at version 1.4.

So I compiled this example file from the documentation.
http://www.sfml-dev.org/documentation/1.4/

It compiles and runs, however it segfaults on line 42

Code: [Select]

        // Clear screen
         App.Clear();
If I comment it out, the program runs fine, but of course is unusable.  I also tried to run the Pong program from the 1.4 sample files, and the same thing would happen, (Segfault on App.Clear() ) but commenting it out allowed the program to run, but of course it was not very illustrative.

Any Ideas why this would be? All I have done is copy the text from the website for the first program, and copied  text of the pong program.

Below is the source of the Pong Example program. (I changed the name of the font it loads since I don't have a cheeseburger font.)

Code: [Select]



////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Graphics.hpp>
#include <SFML/Audio.hpp>
#include <cmath>


////////////////////////////////////////////////////////////
/// Entry point of application
///
/// \return Application exit code
///
////////////////////////////////////////////////////////////
int main()
{
// Defines PI
const float PI = 3.14159f;

    // Create the window of the application
    sf::RenderWindow App(sf::VideoMode(800, 600, 32), "SFML Pong");

    // Load the sounds used in the game
    sf::SoundBuffer BallSoundBuffer;
    if (!BallSoundBuffer.LoadFromFile("datas/pong/send.wav"))
    {
        return EXIT_FAILURE;
    }
    sf::Sound BallSound(BallSoundBuffer);

    // Load the images used in the game
    sf::Image BackgroundImage, LeftPaddleImage, RightPaddleImage, BallImage;
    if (!BackgroundImage.LoadFromFile("datas/pong/background.jpg")    ||
        !LeftPaddleImage.LoadFromFile("datas/pong/paddle_left.png")   ||
        !RightPaddleImage.LoadFromFile("datas/pong/paddle_right.png") ||
        !BallImage.LoadFromFile("datas/pong/ball.png"))
    {
        return EXIT_FAILURE;
    }

    // Load the text font
    sf::Font Cheeseburger;
    if (!Cheeseburger.LoadFromFile("datas/pong/arial.ttf"))
        return EXIT_FAILURE;

// Initialize the end text
sf::String End;
    End.SetFont(Cheeseburger);
End.SetSize(60.f);
    End.Move(150.f, 200.f);
    End.SetColor(sf::Color(50, 50, 250));

    // Create the sprites of the background, the paddles and the ball
    sf::Sprite Background(BackgroundImage);
    sf::Sprite LeftPaddle(LeftPaddleImage);
    sf::Sprite RightPaddle(RightPaddleImage);
    sf::Sprite Ball(BallImage);

    LeftPaddle.Move(10, (App.GetView().GetRect().GetHeight() - LeftPaddle.GetSize().y) / 2);
    RightPaddle.Move(App.GetView().GetRect().GetWidth() - RightPaddle.GetSize().x - 10, (App.GetView().GetRect().GetHeight() - RightPaddle.GetSize().y) / 2);
    Ball.Move((App.GetView().GetRect().GetWidth() - Ball.GetSize().x) / 2, (App.GetView().GetRect().GetHeight() - Ball.GetSize().y) / 2);

    // Define the paddles properties
    sf::Clock AITimer;
const float AITime     = 0.1f;
    float LeftPaddleSpeed  = 400.f;
    float RightPaddleSpeed = 400.f;

    // Define the ball properties
    float BallSpeed = 400.f;
    float BallAngle;
    do
    {
        // Make sure the ball initial angle is not too much vertical
        BallAngle = sf::Randomizer::Random(0.f, 2 * PI);
    } while (std::abs(std::cos(BallAngle)) < 0.7f);

bool IsPlaying = true;
    while (App.IsOpened())
    {
        // Handle events
        sf::Event Event;
        while (App.GetEvent(Event))
        {
            // Window closed or escape key pressed : exit
            if ((Event.Type == sf::Event::Closed) ||
               ((Event.Type == sf::Event::KeyPressed) && (Event.Key.Code == sf::Key::Escape)))
            {
                App.Close();
                break;
            }
        }

        if (IsPlaying)
{
// Move the player's paddle
            if (App.GetInput().IsKeyDown(sf::Key::Up) && (LeftPaddle.GetPosition().y > 5.f))
LeftPaddle.Move(0.f, -LeftPaddleSpeed * App.GetFrameTime());
            if (App.GetInput().IsKeyDown(sf::Key::Down) && (LeftPaddle.GetPosition().y < App.GetView().GetRect().GetHeight() - LeftPaddle.GetSize().y - 5.f))
LeftPaddle.Move(0.f, LeftPaddleSpeed * App.GetFrameTime());

// Move the computer's paddle
            if (((RightPaddleSpeed < 0.f) && (RightPaddle.GetPosition().y > 5.f)) ||
                ((RightPaddleSpeed > 0.f) && (RightPaddle.GetPosition().y < App.GetView().GetRect().GetHeight() - RightPaddle.GetSize().y - 5.f)))
            {
                RightPaddle.Move(0.f, RightPaddleSpeed * App.GetFrameTime());
            }

            // Update the computer's paddle direction according to the ball position
            if (AITimer.GetElapsedTime() > AITime)
            {
                AITimer.Reset();
                if ((RightPaddleSpeed < 0) && (Ball.GetPosition().y + Ball.GetSize().y > RightPaddle.GetPosition().y + RightPaddle.GetSize().y))
                    RightPaddleSpeed = -RightPaddleSpeed;
                if ((RightPaddleSpeed > 0) && (Ball.GetPosition().y < RightPaddle.GetPosition().y))
                    RightPaddleSpeed = -RightPaddleSpeed;
            }

// Move the ball
float Factor = BallSpeed * App.GetFrameTime();
            Ball.Move(std::cos(BallAngle) * Factor, std::sin(BallAngle) * Factor);

// Check collisions between the ball and the screen
if (Ball.GetPosition().x < 0.f)
{
IsPlaying = false;
End.SetText("You lost !\n(press escape to exit)");
}
if (Ball.GetPosition().x + Ball.GetSize().x > App.GetView().GetRect().GetWidth())
{
IsPlaying = false;
End.SetText("You won !\n(press escape to exit)");
}
if (Ball.GetPosition().y < 0.f)
{
//BallSound.Play();
BallAngle = -BallAngle;
Ball.SetY(0.1f);
}
if (Ball.GetPosition().y + Ball.GetSize().y > App.GetView().GetRect().GetHeight())
{
//BallSound.Play();
BallAngle = -BallAngle;
Ball.SetY(App.GetView().GetRect().GetHeight() - Ball.GetSize().y - 0.1f);
}

// Check the collisions between the ball and the paddles
// Left Paddle
if (Ball.GetPosition().x < LeftPaddle.GetPosition().x + LeftPaddle.GetSize().x &&
Ball.GetPosition().x > LeftPaddle.GetPosition().x + (LeftPaddle.GetSize().x / 2.0f) &&
Ball.GetPosition().y + Ball.GetSize().y >= LeftPaddle.GetPosition().y &&
Ball.GetPosition().y <= LeftPaddle.GetPosition().y + LeftPaddle.GetSize().y)
{
//BallSound.Play();
BallAngle = PI - BallAngle;
Ball.SetX(LeftPaddle.GetPosition().x + LeftPaddle.GetSize().x + 0.1f);
}

// Right Paddle
if (Ball.GetPosition().x + Ball.GetSize().x > RightPaddle.GetPosition().x &&
Ball.GetPosition().x + Ball.GetSize().x < RightPaddle.GetPosition().x + (RightPaddle.GetSize().x / 2.0f) &&
Ball.GetPosition().y + Ball.GetSize().y >= RightPaddle.GetPosition().y &&
Ball.GetPosition().y <= RightPaddle.GetPosition().y + RightPaddle.GetSize().y)
{
//BallSound.Play();
BallAngle = PI - BallAngle;
Ball.SetX(RightPaddle.GetPosition().x - Ball.GetSize().x - 0.1f);
}
}

        // Clear the window
        //App.Clear();

        // Draw the background, paddles and ball sprites
        App.Draw(Background);
        App.Draw(LeftPaddle);
        App.Draw(RightPaddle);
        App.Draw(Ball);

        // If the game is over, display the end message
        if (!IsPlaying)
            App.Draw(End);

        // Display things on screen
        App.Display();
    }

    return EXIT_SUCCESS;
}