Enable anisotropic filtering

[oomek]

It should be relatively easy to implement according to this guide:
http://www.informit.com/articles/article.aspx?p=770639&seqNum=2

[Foaly]

Well I guess it could be done. The question is how to find a good API for implementing it. It would of course be nice to set a kind of level for the texture filtering. Something like

enum FilterLevel
{
    Nearest,
    BiLinear,
    Anisotropic
}

But it will be difficult to fit it to the current Texture::setSmooth API.

[oomek]

I don’t think we need an additional api to change the filtering to anisotropic. You just call glTexParameterf() which is used to set the bilinear filtering in SFML. The only problem is with checking if the device supports GL_EXT_texture_filter_anisotropic extension, but that is also one function call available in glTools. I’m preety sure i could set the aniso for all the textures by modifying just one line of SFML code, but without checking if it’s supported.

[Foaly]

Hmm I don't think it should be enabled by default when filtering is enabled, as it may come with quiet a performance impact (wikipedia).

[oomek]

Of course, it should be enabled per texture. It’s not expensive on the modern hardware, maybe on devices 10 year old. I’ve never experienced any fps drops, even by one frame when I was enabling aniso.