Messages

1

General / Re: Is there a way to force SFML to do exact selection?

« on: November 10, 2014, 09:52:02 pm »

Thanks for the suggestions. I found this solution that is quite simple:

http://stackoverflow.com/questions/11716268/point-in-polygon-algorithm

2

General / Is there a way to force SFML to do exact selection?

« on: November 10, 2014, 07:22:57 pm »

I want to be able to select a sf::Shape by clicking with the mouse. I realize I can call sf::Shape::getGlobalBounds to get the bounding rectangle and use sf::FloatRect::contains to test against a point. But what if I need to know if the user clicked on the Shape itself, not just inside its bounding rectangle? Is there a way to do this in SFML?

3

Window / Best way to draw at pixel position instead of world position?

« on: October 05, 2014, 10:38:29 am »

What is the best way to draw an object at a specific pixel location rather than world position? I want to draw a sf::Text in one corner regardless of zoom, rotation, translation of the main view or the size of the window. So far, I have done this:

sf::View savedView = window.getView();
sf::View tempView;
tempView.reset(sf::FloatRect(0, 0, window.getSize().x, window.getSize().y));
// ....
window.setView(tempView);
window.draw(text);
window.setView(savedView);
 

This works, but is it the recommended way? Is there a faster/better way?

Thanks,
lmorsino

4

Graphics / Re: SFML with vertex array objects

« on: June 02, 2014, 09:46:56 pm »

Well, when I try to use GLEW 1.10 for example, I get a warning message at compile time that says

"warning: libGLEW.so.1.5, needed by libsfml-graphics.so, not found"

So this is why I think it matters to SFML. Is it needed or is it not needed?

5

Graphics / SFML with vertex array objects

« on: June 02, 2014, 07:16:01 pm »

Trying to get VAOs working, not succeeding, and I'm wondering if it is because of GLEW.

Basically, I try to do this:

glGenVertexArrays(1, &g_vao);
glBindVertexArray(g_vao);

This doesn't compile. I looked into it further and it seems like GLEW 1.5.0 (is this version specifically required by SFML 2.1?) doesn't support vertex arrays. When I tried

if (glewIsSupported("GL_ARB_vertex_array_object"))

...this returns false. If I upgrade to the latest version of GLEW 1.10.0, it returns true but my app crashes during rendering (presumably because SFML doesn't support 1.10.0)

Later I found this page: http://glew.sourceforge.net/log.html
...which seems to indicate vertex arrays weren't added until GLEW 1.5.1

Am I understanding this correctly? Are we simply meant to not use VAOs in SFML?

If it matters, I am on Ubuntu 13.10-64 bit with C::B, and I am not using SFML for drawing - its pure OpenGL calls.
Thanks!