Messages

1

Graphics / Re: [2.1] Can't get PNG transparency to work

« on: March 11, 2014, 12:03:08 am »

Okay I managed to make everything work. Latest VirtualBox version and guest additions didn't help but I discovered that instead of using LIBGL_ALWAYS_INDIRECT to avoid the segfault I could use LIBGL_ALWAYS_SOFTWARE which does not reduce OpenGL to 1.4.

Here is the result of the same code as the previous post:

vlanore@vlanore-vm:~/zzbl/test$ ./test
Segmentation fault
vlanore@vlanore-vm:~/zzbl/test$ export LIBGL_ALWAYS_SOFTWARE=1
vlanore@vlanore-vm:~/zzbl/test$ ./test
version:2.1

2

Graphics / Re: [2.1] Can't get PNG transparency to work

« on: March 02, 2014, 07:04:32 pm »

Seems you are right:

vlanore@vlanore-vm:~/zzbl/test$ ./test
Segmentation fault
vlanore@vlanore-vm:~/zzbl/test$ export LIBGL_ALWAYS_INDIRECT=1
vlanore@vlanore-vm:~/zzbl/test$ ./test
version:1.4

As exemplified by these commands I use LIBGL_ALWAYS_INDIRECT as a workaround to avoid insta-segfaulting on window creation. It seems though that it's too brutal and cripples SFML :/

Further investigation revealed the segfault is probably video-drivers-related and I'm currently in the process of trying to upgrade them to the latest possible version. I'm hoping that avoiding the LIBGL_ALWAYS_INDIRECT workaround will fix my transparency problem.

3

Graphics / Re: [2.1] Can't get PNG transparency to work

« on: March 01, 2014, 11:44:05 pm »

Here is a screen of what I get (attachment).

Since it runs fine for you it's probably driver/opengl/virtualbox/thing - related. I'll look into that. Any idea is welcome

4

Graphics / Re: [2.1] Can't get PNG transparency to work

« on: March 01, 2014, 11:00:23 pm »

Thanks for the quick answer.

Here is a PNG texture. I've tried with several PNGs including random ones from the web and it works with none.

5

Graphics / [solved] [2.1] Can't get PNG transparency to work

« on: March 01, 2014, 09:57:11 pm »

Hello,
I'm new to SFML and I'm trying to draw sprites with transparency (mostly to draw things on top of other things).
From the tutorials and forum topics I've browsed, I understand that PNG texture transparency should work without doing anything special.

Here is what I've done (slightly modified base tuto):

#include <SFML/Graphics.hpp>

int main()
{
    sf::RenderWindow window(sf::VideoMode(200, 200), "SFML works!");
    sf::Texture myTexture;
    myTexture.loadFromFile("./textures.png");
    sf::Sprite mySprite;
    mySprite.setTexture(myTexture);

    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
        }
        window.clear(sf::Color::Blue);
        window.draw(mySprite);
        window.display();
    }
    return 0;
}

And when I run it, at the places where my texture is transparent I see a white rectangle instead of the blue background. I'd like the background (or anything drawn before) to be displayed through the transparent parts of the image. I have tried various PNG images with no success.

Did I do something wrong or miss anything? Is this a bug/config problem on my end?

I'm running the git version of SFML compiled by hand on debian on a virtual machine (3d acceleration working,  no direct rendering) and with an ATI radeon 6950.

Any help is welcome

EDIT: my problem was solved (see my last post below) and was VirtualBox-related.