Thanks Christophe, fixes now merged and submitted to SVN.
On Tue, Sep 2, 2008 at 10:00 AM, christophe loustaunau <[EMAIL PROTECTED]> wrote: > Sorry, there is an error on the files I have send , please use this new > files. > > Thanks. > > On Tue, Sep 2, 2008 at 10:42 AM, christophe loustaunau > <[EMAIL PROTECTED]> wrote: >> >> Hi, >> >> I have found some errors on the example osgGeometryShaders. It's about the >> varying in the geometry shader. >> take a look at the varying vec4 v_color. >> In the vertex shader, v_color is initialized to gl_vertex >> then in the geometry shader v_color is initialized to gl_PositionIn[0] >> and in the fragment shader v_color is used as the fragment color. >> >> Try to initialized v_color to vec4(1.0, 0.0, 0.0, 1.0) in the vertex >> shader and comment the line : >> " v_color = v;\n" in the geometry shader, and you will see the lines >> as black ! >> >> It's because you have to use keywords in and out. >> >> extract from : >> http://www.opengl.org/registry/specs/EXT/geometry_shader4.txt : >> >> in - for function parameters passed into a function or for input varying >> variables (geometry only) >> >> out - for function parameters passed back out of a function, but not >> initialized for use when passed in. Also for output varying variables >> (geometry only). >> >> Then for a geometry shader, a varying must be an array : >> extract from : >> http://www.opengl.org/registry/specs/EXT/geometry_shader4.txt : >> >> Since a geometry shader operates on primitives, each input varying >> variable needs to be >> declared as an array. Each element of such an array corresponds to a >> vertex of the primitive being processed. If the varying variable is >> declared as a scalar or matrix in the vertex shader, it will be a >> one-dimensional array in the geometry shader. Each array can optionally >> have a size declared. If a size is not specified, it inferred by the >> linker and depends on the value of the input primitive type. >> >> >> Here is a patch based on the svn version of osg that correct that. >> >> Regards. >> >> -- >> Christophe Loustaunau. > > > > -- > Christophe Loustaunau. > > _______________________________________________ > osg-submissions mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org > > _______________________________________________ osg-submissions mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org
