Re: [osg-users] How to setup and confirm a proper forward-compatipble GL3 context
Hi J-S, thank you for your answer, and sorry my late response, was without connection for some time. I activated the uniforms, but still the uniforms don't get printed through my update callback. When I activate these uniforms, does this mean at all that they should be get in any StateSet of any Node ? I think they should, as otherwise I couldn't use them, right ? Does anybody else tell me how I can create and confirm a proper GL3 context ? Thank you, Cheers, PP Hi Peter, I don't know about your other questions about the GL 3 context, but I can answer this since I've been looking at it recently. How do I get these default osg_ Uniforms into the StateSet ? The only place where I find code for creaating them is osgUtil::SceneView, which is marked as deprecated. See the osgvertexattributes example, there you will see that you need to do: context-getState()-setUseModelViewAndProjectionUniforms(true); once you've created your context. You'll probably also need context-getState()-setUseVertexAttributeAliasing(true); Though I'm not sure exactly what it does. Search in the OSG sources for getUseModelViewAndProjectionUniforms() and getUseVertexAttributeAliasing() and you'll see where they are used to create and update the uniforms / variables. Hope this helps, J-S ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] How to setup and confirm a proper forward-compatipble GL3 context
Hi Peter, I activated the uniforms, but still the uniforms don't get printed through my update callback. When I activate these uniforms, does this mean at all that they should be get in any StateSet of any Node ? I think they should, as otherwise I couldn't use them, right ? No, they get pushed into the state by the SceneView and other internal classes, so it's very possible that you'll never see them in any StateSet. As I said before: Search in the OSG sources for getUseModelViewAndProjectionUniforms() and getUseVertexAttributeAliasing() and you'll see where they are used to create and update the uniforms / variables. Hope this helps, J-S -- __ Jean-Sébastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.dyndns-web.com/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] How to setup and confirm a proper forward-compatipble GL3 context
Hi J-S, thanks for your reply, that makes sense and helps. I'll try to ask the community about the GL3 context in another topic if nobody answers here anymore. Maybe this will solve the other issues. Cheers, PP Hi Peter, I activated the uniforms, but still the uniforms don't get printed through my update callback. When I activate these uniforms, does this mean at all that they should be get in any StateSet of any Node ? I think they should, as otherwise I couldn't use them, right ? No, they get pushed into the state by the SceneView and other internal classes, so it's very possible that you'll never see them in any StateSet. As I said before: Search in the OSG sources for getUseModelViewAndProjectionUniforms() and getUseVertexAttributeAliasing() and you'll see where they are used to create and update the uniforms / variables. Hope this helps, J-S ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] How to setup and confirm a proper forward-compatipble GL3 context
Hi, I have some doubts about my approach to create a GL3 non FFP context.
I have compiled osg with all the cmake settings for GL3 as explained in
lots of other posts.
When I create an object ( a simple two Vertex line ), usual camera
manipulation is working without me having writrten a single shader for
the vertex tranform. I expect this not to work, is this wrong ?
The geode is a child of a osg::PositionAttitudeTransform with a rotation
UpdateCallback. This also works, but it shouldn't without Shaders, right ?
Moreover, I create a StateSet for the Transform and give it
osg::StateSet::Callback to print all uniforms, no osg_ Uniforms ( e.g.
osg_ViewMatrix ) get printed out. Is it possible that all this works
without FFP ? I guess not.
How do I get these default osg_ Uniforms into the StateSet ? The only
place where I find code for creaating them is osgUtil::SceneView, which
is marked as deprecated.
As the glContextVersion of the GraphicsContext attached to the default
camera in the default viewer is 1.0, I use this way I set up the GL3
Context.
Please correct me if there is a better way, and if this does creat the
required context at all.
osg::GraphicsContext::Traits * traits = new
osg::GraphicsContext::Traits() ;
int width = 1920 , height = 1200 ;
traits - x = 0 ;
traits - y = 0 ;
traits - width = width ;
traits - height = height ;
traits - windowDecoration = false ;
traits - doubleBuffer = true ;
traits - glContextVersion = std::string( 3.3 ) ;
osg::Camera * cam = new osg::Camera() ;
cam - setGraphicsContext(
osg::GraphicsContext::createGraphicsContext( traits ) ) ;
cam - setViewport( 0 , 0 , width , height ) ;
cam - setClearMask( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ) ;
cam - setClearColor( osg::Vec4( 0.0 , 0.0 , 0.0 , 1.0 ) ) ;
cam - setProjectionMatrixAsPerspective( 30.0f , ( float )width / (
float )height , 1.0 , 1000.0 ) ;
viewer.setCamera( cam ) ;
// This Line::get() is defined bellow
viewer.setSceneData( Line::get() ) ;
This is the code for the callbacks and the Geometry, as mentined,
no Shaders attached, so why does Transformation work ?
class CBSS_Line : public osg::StateSet::Callback {
void operator()( osg::StateSet * stateSet , osg::NodeVisitor *
nodeVisitor ) {
const osg::StateSet::UniformList uniformList = stateSet -
getUniformList() ;
for(osg::StateSet::UniformList::const_iterator uitr =
uniformList.begin() ;
uitr != uniformList.end() ; ++uitr ) {
std::cout uitr - first std::endl ;
}
}
} ;
class CBN_Line : public osg::NodeCallback {
void operator()( osg::Node * node , osg::NodeVisitor * nodeVisitor
) {
osg::PositionAttitudeTransform * xform = static_cast
osg::PositionAttitudeTransform * ( node ) ;
xform - setAttitude( osg::Quat( nodeVisitor - getFrameStamp()
- getSimulationTime() * osg::PI , osg::Z_AXIS ) ) ;
traverse( node , nodeVisitor ) ;
}
} ;
class Line {
public :
static osg::Node * get() {
osg::ref_ptr osg::PositionAttitudeTransform xformLine = new
osg::PositionAttitudeTransform() ;
xformLine - addUpdateCallback( new CBN_Line ) ;
xformLine - getOrCreateStateSet() - setUpdateCallback( new
CBSS_Line ) ;
osg::ref_ptr osg::Geode geodeLine = new osg::Geode() ;
xformLine - addChild( geodeLine.get() ) ;
osg::Geometry * geomLine = new osg::Geometry() ;
geodeLine - addDrawable( geomLine ) ;
osg::Vec3Array * vrts = new osg::Vec3Array() ;
geomLine - setVertexArray( vrts ) ;
osg::Vec4Array * rgba = new osg::Vec4Array() ;
geomLine - setColorArray( rgba ) ;
geomLine - setColorBinding( osg::Geometry::BIND_OVERALL ) ;
vrts - push_back( osg::Vec3( 0.0f , 0.0f , 0.0f ) ) ;
vrts - push_back( osg::Vec3( 1.0f , 0.0f , 0.0f ) ) ;
rgba - push_back( osg::Vec4( 1.0f , 0.0f , 0.0f , 1.0f ) ) ;
geomLine - addPrimitiveSet( new osg::DrawArrays(
osg::PrimitiveSet::LINES , 0 , 2 ) ) ;
osg::StateSet * stateSet = xformLine - getOrCreateStateSet() ;
stateSet - setAttributeAndModes( new osg::LineWidth( 5.0f ) ) ;
stateSet - setMode( GL_LIGHTING , osg::StateAttribute::OFF ) ;
// Adding an Uniform to test the osg::StateSet::Callback
printing function
stateSet - addUniform( new osg::Uniform( Time , 0.0f ) ) ;
// Not created this shader so far
//osg::Program * program = new osg::Program ;
//program - addShader( osgDB::readShaderFile(
shader/Line.vert ) ) ;
//program - addShader( osgDB::readShaderFile(
shader/Line.frag ) ) ;
//stateSet - setAttributeAndModes( program ,
osg::StateAttribute::ON ) ;
return xformLine.release() ;
}
} ;
Thank you,
Cheers, PP
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Re: [osg-users] How to setup and confirm a proper forward-compatipble GL3 context
Hi Peter, I don't know about your other questions about the GL 3 context, but I can answer this since I've been looking at it recently. How do I get these default osg_ Uniforms into the StateSet ? The only place where I find code for creaating them is osgUtil::SceneView, which is marked as deprecated. See the osgvertexattributes example, there you will see that you need to do: context-getState()-setUseModelViewAndProjectionUniforms(true); once you've created your context. You'll probably also need context-getState()-setUseVertexAttributeAliasing(true); Though I'm not sure exactly what it does. Search in the OSG sources for getUseModelViewAndProjectionUniforms() and getUseVertexAttributeAliasing() and you'll see where they are used to create and update the uniforms / variables. Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.dyndns-web.com/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
