Re: [Ftgl-devel] Use ftgl with WebGL?

[Richard U. <ri...@pa...>]

Hi Sam,

I gave it a go, and added a new render mode to ftgl:
FTTriangleExtractorFont(char const *fontFilePath, std::vector<float>&
triangles);

The vector will receive a triangle strip for processing in whatever
rendering system (WebGL, DirectX, Hoops ...)

The first impression is not bad in my WebGl app.

A diff is attached.

Now, how should I proceed? My preferred way would be to have it included
in the ftgl library. 
If you agree, I will clean up things to make it ready for inclusion. 

Rgds
Richard


Am Mittwoch, den 17.08.2011, 12:56 +0200 schrieb Richard Ulrich:
> Hi Sam,
> 
> Thanks for the quick response. 
> 
> I didn't mention an important detail: 
> I work with WebGL in C++ through the excellent WT library:
> http://www.webtoolkit.eu/wt/doc/reference/html/classWt_1_1WGLWidget.html
> 
> So, Transferring of the data is no problem.
> 
> My research prototype is here:
> http://pointlineweb.ulrichard.ch
> It is mostly done in C++ with very little JavaScript.
> 
> I started with the texture mode directly with libfreetype, but I would
> prefer the tesselated texts because it's probably easier to get the ray
> picking and editing right.
> And in the current desktop version of our CAD, we also use tesselated
> texts from the Windows GDI. Now with the new core we want to make it
> platform independent, and especially my WebGL prototype runs mainly on
> linux.
> 
> So, with the current implementation of ftgl, is it possible to get the
> tesselation, so I can feed the triangles to WebGL myself? 
> And it yes, could you give me some hints on where to start?
> 
> Rgds
> Richard
> 
> 
> On Wed, 2011-08-17 at 11:33 +0200, Sam Hocevar wrote:
> > On Sun, Aug 14, 2011, Richard Ulrich wrote:
> > 
> > > I'm looking into how to render text with WebGL. 
> > > By chance I found the ftgl library, and I'm wondering if I can use it
> > > with WebGl. I coudn't find anything that could answer my question in the
> > > documentation nor the mail archive.
> > > I'm fully aware, that I would'nt get the full funtionality, but if I get
> > > the texture maps or polygon meshes that I could then use in WebGl, that
> > > would already be a hughe help. Or would I use Freetype directly for
> > > that?
> > 
> >    Unfortunately WebGL does not offer the ability to link with native
> > code (unless directly provided by the browser), so FTGL would be of
> > little use.
> > 
> >    It would be possible to retrieve the font tesselation or the font
> > texture (depending on the chosen rendering method), but that would also
> > require exporting the whole glyph information from FreeType, store
> > all of this in an interchange format, then write a WebGL importer and
> > renderer for it. That's a lot of work and probably far beyond the scope
> > of FTGL.
> > 
> 
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