Hi Art,
Per the spec
http://www.opengl.org/registry/specs/EXT/geometry_shader4.txt
- the default value of GEOMETRY_VERTICES_OUT_EXT is 0.
- error INVALID_VALUE is generated by ProgramParameteriEXT if
GEOMETRY_VERTICES_OUT_EXT is negative or exceeds
MAX_GEOMETRY_OUTPUT_VERTICES_EXT.
If the error happening due to ProgramParameteriEXT then I'd say it's a
driver bug.
Such an error is defined during link:
<quote>
Linking will also
fail if the program object contains objects to form a geometry
shader (see
section 2.16), but no objects to form a vertex shader or if the
program
object contains objects to form a geometry shader, and the value of
GEOMETRY_VERTICES_OUT_EXT is zero.
</quote>
But that appears not to be your situation.
I've not experienced this error myself on Quadro FX 360M w/ ForceWare
101.19. I'll be glad to run repro code if you can send.
But my guess is a driver update is in order.
Cheers
-- mew
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:osg-users-
> [EMAIL PROTECTED] On Behalf Of Art Tevs
> Sent: Friday, January 11, 2008 9:33 AM
> To: OpenSceneGraph Users
> Subject: [osg-users] Bug in GeometryShaders causing OpenGL Error
>
> Hi!
>
> After updating the osg version from the svn which do
> include the geometry shader implementation I got
> always an OpenGL invalid value error. (nVidia driver
> 100.14.1)
>
> The error is located in the Program.cpp in the line
> 2667:
>
> _extensions->glProgramParameteri( _glProgramHandle,
> GL_GEOMETRY_VERTICES_OUT_EXT,
> _program->_geometryVerticesOut );
>
> Here the default value of _geometryVerticesOut is set
> to 0, which do cause problems on my system. Changing
> the default value to 1 in the constructor line 2319:
>
> Program::Program() :
> _geometryVerticesOut(1),
> _geometryInputType(GL_TRIANGLES),
> _geometryOutputType(GL_TRIANGLE_STRIP)
> {
> }
>
>
> doesn't break any rendering (I do not use geometry
> shaders at now) and removes the invalid value error.
>
> Could somebody please chek this.
>
> Best regards,
> Art
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