ftgl-devel — FTGL developers

[Ftgl-devel] Undefined reference to glew

[vegulla s. <veg...@gm...>]

while I am working on rendering fonts using ftgl in my opengl project I am
encountering errors stating

g++ -o mygame Sample_GL3_2D.cpp glad.c -lGL -lglfw -ldl -lftgl  -lSOIL
-I /usr/include/freetype2 -L/usr/local/lib -lfreetype
/usr/local/lib/libftgl.so: undefined reference to `__glewGenBuffers'
/usr/local/lib/libftgl.so: undefined reference to `glewInit'
/usr/local/lib/libftgl.so: undefined reference to `__glewBindVertexArray'
/usr/local/lib/libftgl.so: undefined reference to `__glewBindBuffer'
/usr/local/lib/libftgl.so: undefined reference to `__glewUniform3f'
/usr/local/lib/libftgl.so: undefined reference to `__glewVertexAttribPointer'
/usr/local/lib/libftgl.so: undefined reference to `__glewBufferData'
/usr/local/lib/libftgl.so: undefined reference to `__glewDeleteBuffers'
/usr/local/lib/libftgl.so: undefined reference to `__glewDeleteVertexArrays'
/usr/local/lib/libftgl.so: undefined reference to `__glewGenVertexArrays'
/usr/local/lib/libftgl.so: undefined reference to
`__glewEnableVertexAttribArray'

these are my contents in Makefile

all:mygame

mygame: Sample_GL3_2D.cpp glad.c
    g++ -o mygame Sample_GL3_2D.cpp glad.c -lGL -lglfw -ldl -lftgl
-lSOIL -I /usr/include/freetype2 -L/usr/local/lib -lfreetype
clean:
    rm mygame

looks like the errors is being raised by the libftgl.so library. I have
installed the GLEW using the glew packages in the ubuntu. but dont
understand why it isn't being referenced.

I have posted the related question on stackoverflow at
http://stackoverflow.com/questions/41694537/undefined-reference-to-glew

-Vegulla SriKavya

[Ftgl-devel] executing my code gives symbol lookup error undefined symbol: glad_glGenTextures

[Nikhil R. <nik...@gm...>]

on executing my code I am facing this error
./sample2D: symbol lookup error: /usr/local/lib/libftgl.so.2: undefined
symbol: glad_glGenTextures

all: sample2D

sample2D: Sample_GL3_2D.cpp glad.c
        g++ -o sample2D Sample_GL3_2D.cpp glad.c -lGL -lglfw -lGLU
-lftgl -ldl -std=c++11

clean:
        rm sample2D


this is my Makefile

[Ftgl-devel] Fwd: error undefined reference to `FTExtrudeFont::FTExtrudeFont(char const*)'

[Nikhil R. <nik...@gm...>]

while I am compiling my opengl code I am facing this error.how to remove
this?

    all: sample2D

    sample2D: Sample_GL3_2D.cpp glad.c
            g++ -o sample2D Sample_GL3_2D.cpp glad.c -lGL -lglfw -ldl
-std=c++11

    clean:
            rm sample2D
this is my contents of Makefile
and my code for rendering the font

    const char* fontfile = "Monaco.ttf";
    GL3Font.font = new FTExtrudeFont(fontfile); // 3D extrude style
rendering

    if(GL3Font.font->Error())
    {
        cout << "Error: Could not load font `" << fontfile << "'" << endl;
        glfwTerminate();
        exit(EXIT_FAILURE);
    }

    // Create and compile our GLSL program from the font shaders
    fontProgramID = LoadShaders( "fontrender.vert", "fontrender.frag" );
    GLint fontVertexCoordAttrib, fontVertexNormalAttrib,
fontVertexOffsetUniform;
    fontVertexCoordAttrib = glGetAttribLocation(fontProgramID,
"vertexPosition");
    fontVertexNormalAttrib = glGetAttribLocation(fontProgramID,
"vertexNormal");
    fontVertexOffsetUniform = glGetUniformLocation(fontProgramID, "pen");
    GL3Font.fontMatrixID = glGetUniformLocation(fontProgramID, "MVP");
    GL3Font.fontColorID = glGetUniformLocation(fontProgramID, "fontColor");

    GL3Font.font->ShaderLocations(fontVertexCoordAttrib,
fontVertexNormalAttrib, fontVertexOffsetUniform);
    GL3Font.font->FaceSize(1);
    GL3Font.font->Depth(0);
    GL3Font.font->Outset(0, 0);
    GL3Font.font->CharMap(ft_encoding_unicode);





link to stackoverflow question I posted regarding this:
http://stackoverflow.com/questions/41647415/error-undefined-reference-to-
ftextrudefontftextrudefontchar-const

-Nikhil Rayaprolu

[Ftgl-devel] Error: identifier 'xxx' is not defined

[ma2 <gpm...@gm...>]

- Windows7
- VC2010Express
The environment described above,

- Freeglut
- Freetype
- Ftgl
We wanted to make a program that made the OpenGL or more.

a large amount of from ftgl "Error: identifier 'xxx' is not defined" 
come out is.

Can not be solved alone myself.
I want to help.

[Ftgl-devel] FTGLExtrdFont AntiAlias

[Ardo A. <ar...@gm...>]

Hi,

I've been trying to figure out if FTGLExtrdFont or vector fonts has a way
to control antialiasing? Or is there something I could do to adjust the
antialiasing?

Re: [Ftgl-devel] FTGL has problems with some cyrillic characters

[Petko <pdi...@gm...>]

Ok , sorry for triple posting , but I figured it out to some extent : 
The problem was caused by calling the font->Advance(some_string) outside 
of the display function . That resulted in FTGL omitting the letters in 
some_string later on when I tried to draw them . I worked around that by 
initializing a separate identical font2 which I use to draw in the 
display fonction .
  Here's a guy with a similar problem 
http://compgroups.net/comp.graphics.api.opengl/ftgl-fonts-rendering-woes/57898

Petko

Re: [Ftgl-devel] FTGL has problems with some cyrillic characters

[Petko <pdi...@gm...>]

I thought I'd seen somewhere that the last version was 3.x.x but , I 
guess I was wrong , the 2.1.3 is the last stable (according to source 
forge) .
  Here's a screenshot with my test on all characters cyrillic 
(bulgarian) + latin : 
http://imageshack.us/a/img337/9783/screenshotfrom201209141.png

(I guess I was wrong that a broken character breaks the rendering 
sequence or it just happened in some other circumstances ) . The same 
result comes out with 5-6 more fonts by the way , so it should be an 
FTGL problem .

[Ftgl-devel] FTGL has problems with some cyrillic characters

[Petko <pdi...@gm...>]

  Hello , everyone ! I have a very strange problem with FTGL . I set up 
a polygon font to Ariel, since its a standard font , but I'm having a 
problem displaying SOME of the Cyrillic characters . For example the 'a' 
doesn't display and breaks the rendering sequence . Has anyone had a 
similar problem ?
PS: I'm on ubuntu with FTGL from the repo-s which is 2.1.3 .. I should 
probably update the library . Still any help would be appreciated .

Petko

[Ftgl-devel] Multi-Face font files

[Manfred W. <MW...@vi...>]

Hi,

When experimenting with FTGL on Mac we found that FTGL has a problem
with multiple faces in one ttf-file:

With multiple faces one has to give the right face index to FT_New_Face.
Unfortunately, it seems that FTGL always uses '0' as the 'default face index'
(see FTFace.cpp):

err = FT_New_Face(*FTLibrary::Instance().GetLibrary(), fontFilePath,
                      DEFAULT_FACE_INDEX, ftFace);
    
Since some of the most basic fonts on Mac and also Linux require this index
to be set, I would be greatly interested in a solution or workaround.
E.g. I read about some patch in this mailing list that would allow to specify the
freetype face externaly. Unfortunately this seems to never have made it into
the release candiate.

Cheers
	Manfred.

[Ftgl-devel] win32 dll

[Stéphane A. <san...@fr...>]

Hi,

I would need win32 dll and headers for FTGL dev, I would like to know if
somebody has already done this and can make it available.

Regards,
S.Ancelot

Re: [Ftgl-devel] Creating font from data instead of a file?

[<pj...@ne...>]

OK, so it turns out it's not a good idea to start programming at 4:30 a.m. after about 5 hours' sleep, and expect to have any respectable neural activity 12 hours later. Turned the TrueType file into hex-coded char array via a Perl script, and I'm good to go...


-----Original Message-----
>From: pj...@ne...
>Sent: Jan 16, 2012 7:20 PM
>To: ftg...@li...
>Subject: [Ftgl-devel] Creating font from data instead of a file?
>
>Greetings -
>
>I wish to use FTGL in a context in which reading from a TrueType data file won't work. I should be able to use, for example, this method:
>
>    FTTextureFont::FTTextureFont(const unsigned char *pBufferBytes, size_t bufferSizeInBytes)
>
>Basically, I need to compile the "pBufferBytes" into my program. But of course in C/C++, I can't just do this:
>
>    const unsigned char *data = "<contents of a ttf file pasted in>";
>
>because the binary data, as arbitrary unsigned char, contains characters that the compiler is going to reject (un-escaped newlines and goodness knows what else). Am I just missing some obvious technique for this? Apologies if this is a really ignorant question... :-)
>
>- Philip
>
>
>------------------------------------------------------------------------------
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[Ftgl-devel] Creating font from data instead of a file?

[<pj...@ne...>]

Greetings -

I wish to use FTGL in a context in which reading from a TrueType data file won't work. I should be able to use, for example, this method:

    FTTextureFont::FTTextureFont(const unsigned char *pBufferBytes, size_t bufferSizeInBytes)

Basically, I need to compile the "pBufferBytes" into my program. But of course in C/C++, I can't just do this:

    const unsigned char *data = "<contents of a ttf file pasted in>";

because the binary data, as arbitrary unsigned char, contains characters that the compiler is going to reject (un-escaped newlines and goodness knows what else). Am I just missing some obvious technique for this? Apologies if this is a really ignorant question... :-)

- Philip

[Ftgl-devel] Problems with TextureFont

[Mark V. <mar...@ho...>]

Hi I;m using ftgl in our open source RTS megaglest (see megaglest.org)
and i am finding that somehow the font is rendering with an alpha value
from somewhere (but not what i spoecify in glColor4fv(1.f,1.f,1.f,1.f);
The reason i know is because i have both olkd and new font systems and
the old font system is much whiter than when i use ftgl.

Any idea whats wrong?

Re: [Ftgl-devel] Best Performance

[Rémy S. <rem...@hy...>]

On Tuesday 13 September 2011 08:57:20 you wrote:
> Hi Remy
> 
> Sounds like it shouldn't be too difficult to make a scrolling text
> application that runs well on such a machine.
> 
> On 12 September 2011 23:53, Rémy Sanchez <rem...@hy...>wrote:
> > On top of my screen, there is something quite like a HTML <marquee>, so
> > my main concern is to get my text translating ultra-smoothly. And as you
> > know, translation is very difficult to get smooth...
> 
> It shouldn't be that difficult really if you only move by a small amount
> (eg. 1 pixel each frame) at a high enough frame rate, the motion should
> appear smooth. Though if that doesn't appear to move smoothly, you can try
> to add a kind of motion blur effect to your text. Instead of using glClear
> to wipe the screen after each frame, just draw a mostly-transparent quad
> (I'd try for about an alpha of 0.85 first) over the whole screen. If
> performance is a problem, then you can just draw it over where the text was
> on the previous frame. This may seem counter intuitive, but a bit of blur
> like this can make motion feel a bit smoother.
> 
> Now the question is : what is the most performant way to render this text ?
> 
> > I
> > guess it'll be either a texture, either a polygon, but I'm not quite
> > sure. And
> > does it make sense to cache anything ? If so, how to do it ?
> 
> For performance, if you're trying for a specific environment, the best way
> is going to be to measure it empirically. Make yourself an FPS counter and
> test the various methods. If you're not going to transform the text at
> strange angles, then you have the option of  FTBitmapFont and FTPixmapFont,
> which should in theory be fastest, as they are the simplest methods (and
> the GMA 900 series has no hardware T&L). I'd try FTTextureFont next, as if
> you did ever need to rotate the text you have the option to, and you may
> find it faster or as fast as the Bitmap/Pixmap options anyway, or
> generally just fast enough. Vector fonts will probably be slower (but
> still, test them and measure it).
> http://ftgl.sourceforge.net/docs/html/ftgl-tutorial.html To do a simple
> test, all you have to do is replace the creation line with another one.
> 
> > I'll add that I don't care about anti-aliasing, because the viewer's eye
> > is far enough not to notice it, and I don't need no rotation nor
> > rescale. Ah, and
> > I don't know if this is useful to say, but the i945 is stuck with OpenGL
> > 1.4.
> 
> If I remember correctly, FTGL doesn't use any particularly new OpenGL
> features, so even going back to OpenGL 1.1, you'd probably still be fine.
> 
> Anyway, you might want to try using processing.org (or something else
> equally high level) if it's just a simple text-scrolling application, and
> only delve deeper from there if the performance is insufficient. Human
> cycles are more valuable than computer cycles. :)
> 
> Hope this helps
> -Bill

Ok, did some tests :

  - Indeed getting the scrolling smooth is easy... With only text on screen, 
which is not the case

  - FTTextureFont appears to be the fastest (no real mesurment however)

  - The human eye is a bitch : drop a single frame in the translation and it's 
atrocious to see. There is muuuuch more tolerence with things like changing 
opacity... In short : render it at precisely 60Hz, or die.

  - Motion blur does not help (60Hz looks fine, less makes regular jumps, and 
30Hz is just too slow).

  - Applying a low pass filter on the time differential helps (avoids jumps)

  - Moving by non-integer coordinate gives a strange behaviour with letters 
"snapping" differently to pixels (?). As a result, when translating the text, 
the distance between letters may change. This is not much a problem, but quite 
funny though.

-- 
Rémy Sanchez
http://hyperthese.net/

Re: [Ftgl-devel] Best Performance

[Rémy S. <rem...@hy...>]

On Tuesday 13 September 2011 08:57:20 you wrote:
> Hi Remy
> 
> Sounds like it shouldn't be too difficult to make a scrolling text
> application that runs well on such a machine.

Well, I've run quick tests with a Pyglet application, and what I found out is 
that scrolling the text alone is no problem, but frame drops appear when I add 
images on the screen (the application mostly consists in displaying a 
slideshow).

If I just display the plain image it doesn't seems to slow the things down, 
but when I ask for a rescale, there things turn bad. Now I'll pre-resize 
pictures with software (once at the application's launch) before sending them 
to the GPU, I think it'll help.

> On 12 September 2011 23:53, Rémy Sanchez <rem...@hy...>wrote:
> > On top of my screen, there is something quite like a HTML <marquee>, so
> > my main concern is to get my text translating ultra-smoothly. And as you
> > know, translation is very difficult to get smooth...
> 
> It shouldn't be that difficult really if you only move by a small amount
> (eg. 1 pixel each frame) at a high enough frame rate, the motion should
> appear smooth. Though if that doesn't appear to move smoothly, you can try
> to add a kind of motion blur effect to your text. Instead of using glClear
> to wipe the screen after each frame, just draw a mostly-transparent quad
> (I'd try for about an alpha of 0.85 first) over the whole screen. If
> performance is a problem, then you can just draw it over where the text was
> on the previous frame. This may seem counter intuitive, but a bit of blur
> like this can make motion feel a bit smoother.

Why not, I'll try that. There's something funny that I found out developping 
on my desktop : when I calculate the coordinates of the text in function of 
time (with a high-precision timer), it feels way less smooth than just adding 
an integer constant. And adding a float constant gives the same non-smooth 
experience. And more funny : I did not have this behaviour with Pyglet...

I guess it's a well known behaviour, but it's my first time doing opengl/any 
kind of graphical animation.

> Now the question is : what is the most performant way to render this text ?
> 
> > I
> > guess it'll be either a texture, either a polygon, but I'm not quite
> > sure. And
> > does it make sense to cache anything ? If so, how to do it ?
> 
> For performance, if you're trying for a specific environment, the best way
> is going to be to measure it empirically. Make yourself an FPS counter and
> test the various methods. If you're not going to transform the text at
> strange angles, then you have the option of  FTBitmapFont and FTPixmapFont,
> which should in theory be fastest, as they are the simplest methods (and
> the GMA 900 series has no hardware T&L). I'd try FTTextureFont next, as if
> you did ever need to rotate the text you have the option to, and you may
> find it faster or as fast as the Bitmap/Pixmap options anyway, or
> generally just fast enough. Vector fonts will probably be slower (but
> still, test them and measure it).
> http://ftgl.sourceforge.net/docs/html/ftgl-tutorial.html To do a simple
> test, all you have to do is replace the creation line with another one.

And the pixmap/bitmap will be generated each time I call Render() ? Ins't that 
uselessly repetitive ?

> > I'll add that I don't care about anti-aliasing, because the viewer's eye
> > is far enough not to notice it, and I don't need no rotation nor
> > rescale. Ah, and
> > I don't know if this is useful to say, but the i945 is stuck with OpenGL
> > 1.4.
> 
> If I remember correctly, FTGL doesn't use any particularly new OpenGL
> features, so even going back to OpenGL 1.1, you'd probably still be fine.
> 
> Anyway, you might want to try using processing.org (or something else
> equally high level) if it's just a simple text-scrolling application, and
> only delve deeper from there if the performance is insufficient. Human
> cycles are more valuable than computer cycles. :)

Sounds like a fun tool, however I need to integrate web pages and videos as 
well, so as far as I know the only option I have is to use Qt. Plus, doing 
OpenGL is fun, why leave the pleasure to others :3

> Hope this helps
> -Bill

Yup, thanks :)

-- 
Rémy Sanchez
http://hyperthese.net/

Re: [Ftgl-devel] Best Performance

[Bill R. <air...@gm...>]

Hi Remy

Sounds like it shouldn't be too difficult to make a scrolling text
application that runs well on such a machine.

On 12 September 2011 23:53, Rémy Sanchez <rem...@hy...>wrote:

> On top of my screen, there is something quite like a HTML <marquee>, so my
> main concern is to get my text translating ultra-smoothly. And as you know,
> translation is very difficult to get smooth...
>

It shouldn't be that difficult really if you only move by a small amount
(eg. 1 pixel each frame) at a high enough frame rate, the motion should
appear smooth. Though if that doesn't appear to move smoothly, you can try
to add a kind of motion blur effect to your text. Instead of using glClear
to wipe the screen after each frame, just draw a mostly-transparent quad
(I'd try for about an alpha of 0.85 first) over the whole screen. If
performance is a problem, then you can just draw it over where the text was
on the previous frame. This may seem counter intuitive, but a bit of blur
like this can make motion feel a bit smoother.

Now the question is : what is the most performant way to render this text ?
> I
> guess it'll be either a texture, either a polygon, but I'm not quite sure.
> And
> does it make sense to cache anything ? If so, how to do it ?
>

For performance, if you're trying for a specific environment, the best way
is going to be to measure it empirically. Make yourself an FPS counter and
test the various methods. If you're not going to transform the text at
strange angles, then you have the option of  FTBitmapFont and FTPixmapFont,
which should in theory be fastest, as they are the simplest methods (and the
GMA 900 series has no hardware T&L). I'd try FTTextureFont next, as if you
did ever need to rotate the text you have the option to, and you may find it
faster or as fast as the Bitmap/Pixmap options anyway, or generally just
fast enough. Vector fonts will probably be slower (but still, test them and
measure it). http://ftgl.sourceforge.net/docs/html/ftgl-tutorial.html To do
a simple test, all you have to do is replace the creation line with another
one.


>
> I'll add that I don't care about anti-aliasing, because the viewer's eye is
> far enough not to notice it, and I don't need no rotation nor rescale. Ah,
> and
> I don't know if this is useful to say, but the i945 is stuck with OpenGL
> 1.4.
>
>
If I remember correctly, FTGL doesn't use any particularly new OpenGL
features, so even going back to OpenGL 1.1, you'd probably still be fine.

Anyway, you might want to try using processing.org (or something else
equally high level) if it's just a simple text-scrolling application, and
only delve deeper from there if the performance is insufficient. Human
cycles are more valuable than computer cycles. :)

Hope this helps
-Bill

[Ftgl-devel] Best Performance

[Rémy S. <rem...@hy...>]

Hi,

I'm developping an application that will run on a shit-PC (shit-Atom + shit-
i945), that will have to run smoothly on a reasonably big screen (I don't 
remember the exact size, but it's something like 1920x1200).

On top of my screen, there is something quite like a HTML <marquee>, so my 
main concern is to get my text translating ultra-smoothly. And as you know, 
translation is very difficult to get smooth...

Now the question is : what is the most performant way to render this text ? I 
guess it'll be either a texture, either a polygon, but I'm not quite sure. And 
does it make sense to cache anything ? If so, how to do it ?

I'll add that I don't care about anti-aliasing, because the viewer's eye is 
far enough not to notice it, and I don't need no rotation nor rescale. Ah, and 
I don't know if this is useful to say, but the i945 is stuck with OpenGL 1.4.

Thanks,
-- 
Rémy Sanchez
http://hyperthese.net/

[Ftgl-devel] how to get x bearing value?

[Silverstein <her...@sc...>]

I'm rendering a rectangle in which I want to center some text.  I have 
this mostly working by drawing the rectangle (based on the ftgl bounding 
box) and then by using glBitmap to offset the raster position before 
rendering the text.

The problem is that the left side has too much empty space.  From 
looking at the FTGL diagram at:

http://ftgl.sourceforge.net/docs/html/ftgl-tutorial.html

It looks like this is because of the bearingX offset.  Can someone 
confirm that this is the case?

And second, how can I get this value or the equivalent (so that I can 
properly calculate the horizontal offset to pass to glBitmap)?

Thanks,

Herc

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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Re: [Ftgl-devel] Creating an FTGL font from an existing FT_Face handle

[John V. L. <la...@we...>]

Hi Sam,

 >    Excellent news. This feature will also allow the use of FTGL
 > together with FontConfig (using FcPatternGetFTFace). I will evaluate
 > the patch and let you know of any fixes required.
 >
 > Thanks,
 > --
 > Sam.

Have you had a chance to test this patch yet? I would love to see in the 
SVN trunk soon. It makes it a lot easier to use FTGL and Qt in the same 
project.

Best regards,
John

[Ftgl-devel] FindFTGL.cmake

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

Hi guys,

what about including a FindFTGL.cmake with ftgl? 
That would be especially helpful with the debian package.
I am no expert in cmake finder scripts, but the attached file works for
me. It's based on FindFreetype.cmake from the cmake-data.deb
When installing, it should go to "/usr/share/cmake-2.8/Modules/".

Rgds
Richard

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

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

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.
> 

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

[Sam H. <sa...@ho...>]

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.

-- 
Sam.

[Ftgl-devel] Crash when using polygon fonts with certain TrueType fonts and sizes

[Robert E. <r.e...@te...>]

Hello,

The following code will cause FTGL to crash:

    FTGLPolygonFont font("C:\\Windows\\Fonts\\Calibri.ttf");
    font.FaceSize(12);
    if (font.Error() == 0) {
        font.Render("A");
    }

The issue is in FTPolygonGlyphImpl's constructor, specifically this code:

    if(ft_glyph_format_outline != glyph->format)
    {
        err = 0x14; // Invalid_Outline
        return;
    }

For some TrueType fonts (such as Calibri) this check will succeed for certain sizes and fail for others. There are two problems here. The first is that the "vectoriser" member is not initialized to zero before this code runs, which is what causes the crash when it is dereferenced later on in the Render call. The second is that the error is not propagated up to the font object, so there is no way of checking for it from client code.

It's easy enough to fix the first problem by initializing the vectoriser pointer in the constructor's initializer list. I am not sure of the best way to deal with the second issue, though. I'm also not sure what the current development status for FTGL is or the process for submitting a patch. Any help would be greatly appreciated.

Thank you,

Robert Engeln
r.e...@te...



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[Ftgl-devel] Use ftgl with WebGL?

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

Hi everybody,

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?

Rgds
Richard