There must be something I'm missing.
Below is a repro of my problem. This is a modification of the
osgvertexattributes sample, from the trunk.
Copy/paste the following code after createSimpleTestModel:
Code:
class MyCallback : public osg::Drawable::ComputeBoundingBoxCallback
{
public:
MyCallback() {}
virtual osg::BoundingBox computeBound(const osg::Drawable& drawable) const
{
osg::BoundingBox box(0, 0, 0, 1, 0, 1);
return box;
}
};
osg::Node* createSimpleTestModelATTRIBS()
{
osg::Group* group = new osg::Group;
osg::Geode* geode = new osg::Geode;
group->addChild(geode);
osg::Geometry* geometry = new osg::Geometry;
geometry->setUseDisplayList(false);
geode->addDrawable(geometry);
osg::Vec3Array* vertices = new osg::Vec3Array;
vertices->setName("in_vertex");
vertices->push_back(osg::Vec3(0.0,0.0,0.0));
vertices->push_back(osg::Vec3(0.0,0.0,1.0));
vertices->push_back(osg::Vec3(1.0,0.0,0.0));
vertices->push_back(osg::Vec3(1.0,0.0,1.0));
//geometry->setVertexArray(vertices);
geometry->setVertexAttribArray(6, vertices);
geometry->setVertexAttribNormalize(6, false);
geometry->setVertexAttribBinding(6, osg::Geometry::BIND_PER_VERTEX);
geometry->setComputeBoundingBoxCallback(new MyCallback());
geometry->addPrimitiveSet(new osg::DrawArrays(GL_TRIANGLE_STRIP, 0, 4));
char vertexShaderSource[] =
"#version 150\n"
"in vec3 in_vertex;\n"
"uniform mat4 osg_ModelViewProjectionMatrix;\n"
"void main(void)\n"
"{\n"
" gl_Position = osg_ModelViewProjectionMatrix * vec4(in_vertex,
1.0);\n"
"}\n";
char fragmentShaderSource[] =
"#version 150\n"
"out vec4 out_fragcolor;\n"
"void main(void)\n"
"{\n"
" out_fragcolor = vec4(1.0, 1.0, 0.0, 1.0);\n"
"}\n";
osg::Program* program = new osg::Program;
program->addShader(new osg::Shader(osg::Shader::VERTEX,
vertexShaderSource));
program->addShader(new osg::Shader(osg::Shader::FRAGMENT,
fragmentShaderSource));
program->addBindAttribLocation(std::string("in_vertex"), 6);
geometry->getOrCreateStateSet()->setAttribute(program);
return group;
}
Now modify main() so that it reads:
Code:
bool runConvertToVertexAttributes = true; // Note: true here
if (arguments.read("--simple") || arguments.read("--s"))
{
loadedModel = createSimpleTestModelATTRIBS(); // change the function
name
}
// [...]
if (runConvertToVertexAttributes)
{
// switch on the uniforms that track the modelview and projection
matrices
osgViewer::Viewer::Windows windows;
viewer.getWindows(windows);
for(osgViewer::Viewer::Windows::iterator itr = windows.begin();
itr != windows.end();
++itr)
{
(*itr)->getState()->setUseModelViewAndProjectionUniforms(true);
// Comment out this line (I don't think I need, so I do not use it)
//(*itr)->getState()->setUseVertexAttributeAliasing(true);
}
}
Result: nothing shows up.
Expected: we should see a square.
Now uncomment the setVertexArray line when building the geometry. You will see
the square.
Cheers,
Fred
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=37903#37903
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