[osg-users] Vanishing letters in osg::Text

[Volckaert, Guy (CA - MTS)]

Hi,

I'm using OSG v3.4.0 and I resolved this issue by adding a glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,...) before calling glTexSubImage2D() in glyph.cpp. This problem was occurring if I was using an Intel video driver.

void Glyph::subload() const
{
[...]

// MTSI_BEGIN
    // This line was added to resolve a problem with intel chipsets. In essence, some of the
    // numeric glyphs would not display correctly. They would appear grey or transparent.
    if( getTexture() )
    {
        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, getTexture()->getFilter( osg::Texture::MIN_FILTER ) );
    }
// MTSI_END

    glTexSubImage2D(GL_TEXTURE_2D,0,
                    _texturePosX,_texturePosY,
                    s(),t(),
                    (GLenum)getPixelFormat(),
                    (GLenum)getDataType(),
                    data());
[...]
}

void GlyphTexture::apply(osg::State& state) const
{
[...]
// MTSI_BEGIN
            // This line was added to resolve a problem with intel chipsets. In essence, some of the
            // numeric glyphs would not display correctly. They would appear grey or transparent.
            glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, _min_filter);
// MTSI_END
            // Subload the image once
            glTexSubImage2D( GL_TEXTURE_2D, 0, 0, 0,
                    getTextureWidth(),
                    getTextureHeight(),
                    OSGTEXT_GLYPH_FORMAT, GL_UNSIGNED_BYTE, local_data);
[...]
}

Regards,

-----Original Message-----
From: osg-users [mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Tim Hartter
Sent: April-25-17 7:29 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] Vanishing letters in osg::Text

Setting OSG_TEXT_INCREMENTAL_SUBLOADING to off does not make a difference and YES it happens on Intel cards (not on Nvidia) (Win 7 OSG 3.4)

Maybe the patched OSG text works better...

Mit AquaMail Android
http://www.aqua-mail.com gesendet


Am 25. April 2017 10:18:21 vorm. schrieb Robert Osfield
<robert.osfield at gmail.com>:

> On 25 April 2017 at 06:34, Wouter Roos <rooswouter at gmail.com> wrote:
>> I've experienced a similar issue lately where we were running a
>> project on lower spec systems with only an integrated GPU. On those
>> systems the frame rate would not show properly, having the same issue
>> as described here, with some numbers not showing properly.
>> I did a test on my laptop, and when I force it to use the integrated
>> GPU
>> (4600) the problems shows up as well. If I switch to use the GTX970M
>> everything is fine again. This is all on Windows 10, osg 3.4.0 I
>> haven't done any further investigation as the project is not using
>> any Text objects, but maybe this might help somehow.
>
> Some hardware/drivers don't support texture sub-loading correctly so
> the osgText subloading of new glyphs could cause problems, perhaps
> this is what you are seeing.  It's problem that originally occurred on
> Radeon's and some SGI hardware so there is a workaround in osgText
> that detects these combinations in drivers, you can also enable the
> workaround by setting the env var OSG_TEXT_INCREMENTAL_SUBLOADING to
> OFF i.e. under bash you'd do:
>
>   export OSG_TEXT_INCREMENTAL_SUBLOADING=OFF
>   osgtext
>
> Under windows I think it's something like:
>
>   set OSG_TEXT_INCREMENTAL_SUBLOADING=OFF
>   osgtext
>
> The OSG master version has a had a major rewrite of osgText so it no
> longer uses the texture subloading as may well just work out of the
> box on the Intel GPU/drivers that you have.
>
> Robert.
> _______________________________________________
> osg-users mailing list
> osg-users at lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.
> org


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