[osg-users] Why are my shaders not being used?

[Antoine Rennuit]

Hi all,

The following code renders the square in red (fixed pipeline) rather green (shaders), I guess the shaders are not used.


Code:

#define GLSL330(program) "#version 150\n" #program

const char* vertSource = GLSL330
(
    void main(void)
    {
        gl_Position = ftransform();
    }
);

const char* fragSource = GLSL330
(
    void main(void)
    {
        gl_FragColor = vec4(0,1,0,1);
    }
);

////////////////////////////////////////////////////////////////////////////////
osg::ref_ptr<osg::Geode> SetupNurbsSurface()
{
    osg::ref_ptr<osg::Geode> geode = new osg::Geode();
    assert(geode);
    osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry();
    assert(geometry);
    osg::ref_ptr<osg::Vec3Array> vertices_osg = new osg::Vec3Array();
    assert(vertices_osg);
    osg::ref_ptr<osg::Vec3Array> normals_osg = new osg::Vec3Array();
    assert(normals_osg);
    osg::ref_ptr<osg::DrawElementsUInt> triangles_osg = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
    assert(triangles_osg);
    osg::ref_ptr<osg::Vec4Array> colors = new osg::Vec4Array();
    assert(colors);

    // Setup.
    geode->addDrawable(geometry);
    geometry->setVertexArray(vertices_osg);
    geometry->setNormalArray(normals_osg);
    geometry->addPrimitiveSet(triangles_osg);
    geometry->setColorArray(colors);

    // Vertices.
    vertices_osg->push_back(osg::Vec3(-1.0f,  0.0f, 1.0f));
    vertices_osg->push_back(osg::Vec3(-1.0f,  0.0f, 2.0f));
    vertices_osg->push_back(osg::Vec3(-1.0f, -1.0f, 2.0f));
    vertices_osg->push_back(osg::Vec3(-1.0f, -1.0f, 1.0f));

    // Triangles (primitive sets).
    triangles_osg->push_back(0);
    triangles_osg->push_back(1);
    triangles_osg->push_back(2);
    triangles_osg->push_back(0);
    triangles_osg->push_back(2);
    triangles_osg->push_back(3);

    // Colors.
    colors->setBinding(osg::Array::BIND_OVERALL);
    colors->push_back(osg::Vec4f(1.0f, 0.0f, 0.0f, 1.0f));

    // Normals.
    normals_osg->setBinding(osg::Array::BIND_PER_VERTEX);
    normals_osg->push_back(osg::Vec3(1.0f, 0.0f, 0.0f));
    normals_osg->push_back(osg::Vec3(1.0f, 0.0f, 0.0f));
    normals_osg->push_back(osg::Vec3(1.0f, 0.0f, 0.0f));
    normals_osg->push_back(osg::Vec3(1.0f, 0.0f, 0.0f));
    normals_osg->push_back(osg::Vec3(1.0f, 0.0f, 0.0f));
    normals_osg->push_back(osg::Vec3(1.0f, 0.0f, 0.0f));

    // State.
    osg::ref_ptr<osg::Shader> vertShader = new osg::Shader( osg::Shader::VERTEX, vertSource );

    osg::ref_ptr<osg::Shader> fragShader = new osg::Shader( osg::Shader::FRAGMENT, fragSource );

    osg::ref_ptr<osg::Program> program = new osg::Program;
    program->addShader( vertShader.get() );
    program->addShader( fragShader.get() );

    osg::ref_ptr<osg::StateSet> state = geode->getOrCreateStateSet();
    assert(state);

    state->setAttributeAndModes( program.get(), osg::StateAttribute::ON );
//    state->addUniform("TODO");

    return geode;
}




Any idea of what is going on?

Thanks!

Regards,

Antoine[/code]

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http://forum.openscenegraph.org/viewtopic.php?p=72803#72803