Seems other people have had the same issue as me:
http://forum.openscenegraph.org/viewtopic.php?t=7287
Are there any plans to address the issue in an upcoming release?
Alex
From: Pecoraro, Alexander N
Sent: Wednesday, October 26, 2011 2:17 PM
To: OpenSceneGraph Users
Subject: RE: EXTERNAL: Re: [osg-users] Draw Elements Instanced Shader Help
I think I figured it out. When it links my program for some reason it uses the
names InstancePositions[0] and InstanceScales[0] when it builds its
_uniformInfoMap in the function linkeProgram(). It obtains the names of the
uniforms that my program uses via glGetActiveUniform() (see snippet from
Program.cpp below):
Program::PerContextProgram::linkProgram(osg::State& state)
{
...
for( GLint i = 0; i < numUniforms; ++i )
{
_extensions->glGetActiveUniform( _glProgramHandle,
i, maxLen, 0, &size, &type, name );
GLint loc = _extensions->glGetUniformLocation( _glProgramHandle,
name );
if( loc != -1 )
{
_uniformInfoMap[Uniform::getNameID(reinterpret_cast<const
char*>(name))] = ActiveVarInfo(loc,type,size);
OSG_INFO << "\tUniform \"" << name << "\""
<< " loc="<< loc
<< " size="<< size
<< " type=" << Uniform::getTypename((Uniform::Type)type)
<< std::endl;
}
}
...
}
The value of name that is returned is InstancePositions[0] and
InstanceScales[0] - instead of just InstancePositions and InstanceScales
(without the square brackets) in my scene graph's StateSet. So when it comes
time to apply the uniforms it can't find a mapping from my StateSet's Uniform
to the Program's list of uniforms because the names differ.
Is that normal behavior for glActiveUniform to return array names with square
brackets appended?
Alex
From: [email protected]
[mailto:[email protected]] On Behalf Of Paul Martz
Sent: Wednesday, October 26, 2011 1:55 PM
To: OpenSceneGraph Users
Subject: EXTERNAL: Re: [osg-users] Draw Elements Instanced Shader Help
On 10/26/2011 12:49 PM, Pecoraro, Alexander N wrote:
Any idea what I'm doing wrong?
Have you tried looking at the osgdrawinstanced example to see how your code
differs from functioning code?
--
-Paul Martz Skew Matrix Software
http://www.skew-matrix.com/
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