On Sun, Sep 12, 2010 at 10:18 AM, Werner Modenbach < [email protected]> wrote:
> Hi Robert, > > sorry, I didn't explain clearly enough what I ment. > I have written complex shaders with a lot of functionality. They work > perfect. > Jet me give an example: > In my scene I have objects with and without textures. > Is there any way for the shader itself to detect this difference? > If not, I have to make two versions of the shaders just beeing different in > the one line with the basic texture and load them accordingly? > People get around this by binding a default texture -- for example, a 1x1 white pixel -- at the root of the scene graph. That way you don't have to write two versions of the shaders. > > So my question is: can I querry "uniform sampler2D textureMap" inside the > shader if it was set by my program or not? I couldn'tr find anything like > thar > in the docs. > > No, you can't. Tim > Many thanks in advance > > - Werner - > > > On Saturday 11 September 2010 12:15:57 Robert Osfield wrote: > > Hi Werner, > > > > On Fri, Sep 10, 2010 at 1:39 PM, Werner Modenbach > > > > <[email protected]> wrote: > > > Does anybody know if it is possible inside a shader program to querry > if > > > a "uniform sampler2D" was set by uniform attribute or if it contains > > > legal data? > > > > The OSG should report a warning when shaders fail to link and don't > > have the required uniforms. > > > > There isn't any way for the OSG or OpenGL to know what "legal data" is > > for you shaders, this is all down to you - if you put garbage in > > you'll get garbage out. > > > > Robert. > > _______________________________________________ > > osg-users mailing list > > [email protected] > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- > TEXION Software Solutions > > TEXION GmbH - Rotter Bruch 26a - D 52068 Aachen - HRB 14999 Aachen > Fon: +49 241 475757-0, Fax: +49 241 475757-29, web: http://www.texion.eu > > Geschäftsführer/Managing Director: Werner Modenbach > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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