[osg-users] How to use more than 4 texture units?

[Farshid Lashkari]

Hi Jannik,

I suspect your driver only supports 4 texture units using the fixed
function. Check the GL_MAX_TEXTURE_UNITS value to verify:

GLint units;
glGetIntegerv(GL_MAX_TEXTURE_UNITS, &units);

My GeForce GTX 760 only supports 4 fixed function texture units, but up to
32 units using the shader pipeline. Are you sure the non-OSG based app was
using the fixed function pipeline?

Cheers,
Farshid


On Wed, Jun 17, 2015 at 10:47 AM, Jannik Heller <scrawl at baseoftrash.de>
wrote:

> Oops, posted wrong code - that should have been 4 instead of 3, of course.
>
>
> Code:
>
> diff --git a/examples/osgbillboard/osgbillboard.cpp
> b/examples/osgbillboard/osgbillboard.cpp
> index a6243e8..64f893c 100644
> --- a/examples/osgbillboard/osgbillboard.cpp
> +++ b/examples/osgbillboard/osgbillboard.cpp
> @@ -67,7 +67,7 @@ osg::Drawable* createSquare(const osg::Vec3&
> corner,const osg::Vec3& width,const
>      (*tcoords)[1].set(1.0f,0.0f);
>      (*tcoords)[2].set(1.0f,1.0f);
>      (*tcoords)[3].set(0.0f,1.0f);
> -    geom->setTexCoordArray(0,tcoords);
> +    geom->setTexCoordArray(4,tcoords);
>
>      geom->addPrimitiveSet(new
> osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4));
>
> @@ -76,7 +76,7 @@ osg::Drawable* createSquare(const osg::Vec3&
> corner,const osg::Vec3& width,const
>          osg::StateSet* stateset = new osg::StateSet;
>          osg::Texture2D* texture = new osg::Texture2D;
>          texture->setImage(image);
> -
> stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
> +
> stateset->setTextureAttributeAndModes(4,texture,osg::StateAttribute::ON);
>          geom->setStateSet(stateset);
>      }
>
>
>
>
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=64112#64112
>
>
>
>
>
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