Re: [osg-users] OpenGL3.0
Hi Guy I would recommend a search thru the OSG mailing archives on the subject of OpenGL 3.0 and the fixed pipe line deprecating , there have been many good and useful conversations on this, that would help you understand the fundamental shift in Opengl 3.X going forward and how OSG is proposing to tackle the shift in paradigms Gordon Tomlinson Product Manager 3d Technology Project Wyvern Overwatch(r) An Operating Unit of Textron Systems From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Guy Sent: Wednesday, March 03, 2010 9:35 AM To: OpenSceneGraph Users Subject: [osg-users] OpenGL3.0 Hi all, I built the osg2.9.7. I tried to create the project with the OSG_GL3_AVAILABLE, and he rest GL flags disabled. But when I run the simplest example, osgviewer with the cow.osg to render, it renders nothing and display warnings as TexGen::apply - not supported and some other stuff. I dug into the code and found that this is due that I disabled the OSG_GL_FIXED_FUNCTION_AVAILABLE. Does it mean that with OpenGL3 there is not fixed pipeline and all should be written by shaders? What about the projections of the objects from the 3D world to the camera plan, are they done by OpenGL or should I write them too? And if all should be done by shaders, does it mean that most of the code of OSG won't work under GL3 if no appropriate shaders would be written? Thanks, Guy. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OpenGL3.0
Guy wrote: Does it mean that with OpenGL3 there is not fixed pipeline and all should be written by shaders? What about the projections of the objects from the 3D world to the camera plan, are they done by OpenGL or should I write them too? Short answer is yes. OpenGL 3 does not have a fixed-function pipeline, and all rendering must be done with shaders. There is a compatibility extension that allows you to use most of the fixed-function pipeline, but that really goes against the purpose of OpenGL 3. For the long version, I'll echo Gordon's advice to read the list archives. You might also want to refer to the specifications at http://www.opengl.org/documentation/specs/ --J ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OpenGL3.0
Thanks, I got the main idea, but what about all the OSG foundations? A lot of the code, algorithms and effects are based on the fixed pipeline, am I wrong? Is all this work goes to waste? From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Jason Daly Sent: Wednesday, March 03, 2010 6:09 PM To: OpenSceneGraph Users Subject: Re: [osg-users] OpenGL3.0 Guy wrote: Does it mean that with OpenGL3 there is not fixed pipeline and all should be written by shaders? What about the projections of the objects from the 3D world to the camera plan, are they done by OpenGL or should I write them too? Short answer is yes. OpenGL 3 does not have a fixed-function pipeline, and all rendering must be done with shaders. There is a compatibility extension that allows you to use most of the fixed-function pipeline, but that really goes against the purpose of OpenGL 3. For the long version, I'll echo Gordon's advice to read the list archives. You might also want to refer to the specifications at http://www.opengl.org/documentation/specs/ --J ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OpenGL3.0
Guy wrote: Thanks, I got the main idea, but what about all the OSG foundations? A lot of the code, algorithms and effects are based on the fixed pipeline, am I wrong? Is all this work goes to waste? You'll have to read the long version (i.e.: the list archives) for that. There have been lots of discussions about this. --J ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
