Error during execution on ubuntu vm

[John Sing Dao Siu]

I am able to compile in a Ubuntu 20.10 VM. However it gives following error:

% ./NoCol   
Couldn't find 'conf.txt', loading default
The requested video mode is not available, switching to a valid mode
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  1 (X_CreateWindow)
  Serial number of failed request:  159
  Current serial number in output stream:  160

[Jean Tampon]

You can try to create a conf.txt file with values in this order:

win_width
win_height
objects_count
min_size
max_size

next to the executable.
It seems the default window size is too large so the conf file should allow you to choose a good resolution.

[John Sing Dao Siu]

It is not config issue. I added a few log lines and it stopped at sf::RenderWindow window(sf::VideoMode(conf.win_width, conf.win_height), "NoCol", sf::Style::Fullscreen, settings);. I tried 100x100, 1024x768 etc, smae result.

Tested with https://www.sfml-dev.org/tutorials/2.5/start-linux.php and get the same result:

% ./sfml-app 
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  1 (X_CreateWindow)
  Serial number of failed request:  152
  Current serial number in output stream:  153

Maybe because it is a VM or because Ubuntu 20.10 is using wayland, not sure. However basic glx test like glxheads, glxgears work.

[Jean Tampon]

Are you able to compile and run this SFML hello world ?

#include <SFML/Graphics.hpp>

int main()
{
    sf::RenderWindow window(sf::VideoMode(200, 200), "SFML works!");
    sf::CircleShape shape(100.f);
    shape.setFillColor(sf::Color::Green);

    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
        }

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

    return 0;
}

[John Sing Dao Siu]

Are you able to compile and run this SFML hello world ?

Yes, that is the one I tried and getting error also.

[Jean Tampon]

So it seems it's an SFML error, that's annoying :/

[John Sing Dao Siu]

So it seems it's an SFML error, that's annoying :/

Yeah, my guess is sfml + wayland + ubuntu. As I don't have a bare metal to test, can't rule out vm, but I doubt it as glxgears works.

I am closing this as this is a sfml issue.

Thank you!!