Re: [osg-users] OSG Texture1D and GL_UNSIGNED_SHORT
Hi Chris, On 12 January 2012 22:44, Chris 'Xenon' Hanson xe...@alphapixel.com wrote: Just wanted to log a peculiar error I just dodged. Ive been using a 1D texture to do contour lines on terrain, a common technique. I had some trouble where it appeared that OSG was turning my GL_RGB UBYTE texture into GL_UNSIGNED_SHORT as it was uploading. I'm not sure why this was. I also tried adapting the very code from the osg osgtexture1D.cpp, create1DTextureStateToDecorate() and it seemed to do the same. Could you send this adapted code, or even better a version of osgtexture1D.cpp that can be run with a command line option (such as --ushort) to replicate this error? I didn't debug it all the way into OSG, but I verified with gDebugger that glTexImage1D was being called with GL_UNSIGNED_SHORT for some reason. I switched to Texture2D, which seems to have no downside, and it works properly. I don't know what the issue is. Texture2D has been used far more heavily over the years than Texture1D so I can imagine bugs that have been spotted and fixed in Texture2D that haven't been in Texture1D. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG Texture1D and GL_UNSIGNED_SHORT
On 1/13/2012 2:28 AM, Robert Osfield wrote: Could you send this adapted code, or even better a version of osgtexture1D.cpp that can be run with a command line option (such as --ushort) to replicate this error? I'll see if I can replicate it in a simple form. It was very slippery. I don't know what the issue is. Texture2D has been used far more heavily over the years than Texture1D so I can imagine bugs that have been spotted and fixed in Texture2D that haven't been in Texture1D. Yeah, that's what I suspected. It may have to do with generating mipmaps or something. -- Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com http://www.alphapixel.com/ Digital Imaging. OpenGL. Scene Graphs. GIS. GPS. Training. Consulting. Contracting. There is no Truth. There is only Perception. To Perceive is to Exist. - Xen ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] OSG Texture1D and GL_UNSIGNED_SHORT
Just wanted to log a peculiar error I just dodged. Ive been using a 1D texture to do contour lines on terrain, a common technique. I had some trouble where it appeared that OSG was turning my GL_RGB UBYTE texture into GL_UNSIGNED_SHORT as it was uploading. I'm not sure why this was. I also tried adapting the very code from the osg osgtexture1D.cpp, create1DTextureStateToDecorate() and it seemed to do the same. I didn't debug it all the way into OSG, but I verified with gDebugger that glTexImage1D was being called with GL_UNSIGNED_SHORT for some reason. I switched to Texture2D, which seems to have no downside, and it works properly. I don't have a fix, I'm just recording my experience in case someone else runs into the same situation. Just switch to Texture2D with an n*1 texture unless you have a good reason not to. -- Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com http://www.alphapixel.com/ Digital Imaging. OpenGL. Scene Graphs. GIS. GPS. Training. Consulting. Contracting. There is no Truth. There is only Perception. To Perceive is to Exist. - Xen ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
