[osg-users] how to set width and Stipple of a osgText::BoundingBox?

[Robert Osfield]

Hi Lv,

osgText::Text implementation is very pretty old now, with a design driven
by the needs of very old hardware.  If I were to rewrite osgText I would
not implement it the has been.  I would not recommend adding OpenGL coding
into osgText::Text as this breaks OSG's ability to do lazy state updating.

Robert.

On 27 October 2015 at 16:48, Lv Qing <donlvqing at msn.com> wrote:

> Thx!Robert!
>
>     The situation is,we  have modified the text.cpp to create some other
> styles rather than boundingbox.
>
>     Like a BoundingLine,one end to one of the corner of a BoundingBox,the
> other end linked to a osg::Node.
>
>    So if a text have a BoundingLine and a BoundingBox,I just want draw the
> BoundingBox as normal,but draw the BoundingLine with LineStipple .So I
> think one osg::StateSet may not solve this problem.
>
>   I am not quiet  familiar with the openGL programming since I use osg at
> first.I search the web found people use this code to set
> Linewidth and Stipple
>
> glLineWidth (2.0);
> glLineStipple (1, 0x0F0F);
>
> And I look into text.cpp,found lots of code like use openGL directly,such
> as :
>
>  //glClear(GL_STENCIL_BUFFER_BIT);
>
>  // enable stencil buffer
>     glEnable(GL_STENCIL_TEST);
>
>     // write a one to the stencil buffer everywhere we are about to draw
>     glStencilFunc(GL_ALWAYS, 1, 1);
>
>     // write only to the stencil buffer if we pass the depth test
>     glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
>
>     // Disable writing to the color buffer so we only write to the stencil
>     // buffer and the depth buffer
>     glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
>
>     // make sure the depth buffer is enabled
> //    glEnable(GL_DEPTH_TEST);
> //    glDepthMask(GL_TRUE);
> //    glDepthFunc(GL_LESS);
>
>     // Arrrgh! Why does the code only seem to work correctly if I call
> this?
>     glDepthMask(GL_FALSE);
>
>
>
>  So I think use the openGL code to draw different style may be the qucik
> way.
>
>
>
>
> ...
>
> Thank you!
>
> Cheers,
> Lv
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=65462#65462
>
>
>
>
>
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