Hi Shawn, Unfortunately, I do not think that will work for me. I am dealing with something of the order of 100 million points or more, and I tried to use display lists previously. If I remember correctly, the reason I stopped using them was because they used up a huge amount of my memory when created (I do not know whether they always do this or if it was some sort of excess after the graphics card memory had been filled). That was a couple of months ago. Since then the program has been changed so that now the points move (change vectors, I presume) around the origin as, before, there were precision problems relating to OpenGL's conversion of doubles to floats. As it is, the program is pretty quick in most situations except when we are using the hard drive to store data and caching it (we do this because the data can, on occasions, be 10 GB or more), and I do not see how display lists can be used with caching.
For that reason I want the facility to write to different "layers" independently, such as the overlay facility, if it possible. Currently I am attempting to fiddle with the front and back buffers, copying from one to the other, but I would rather try the overlays (which my graphics card says it can handle) which I believe would be easier to understand and maintain. So, can I do this in gtkglextmm, and how? As I said, Gdk::GL::Config::get_layer_plane() appears to return the number of a layer, but I do not know what to do with it. Do I somehow create a new context for each layer? Regards, Haraldur On 10/02/10 01:46, Shawn Bakhtiar wrote: > > > hhmmmm... > > Have you tried to compile the data points for the model (if they do > not change vectors) > > somthing like this (from the log example): > > /* Forward "G". */ > glNewList (LOGO_G_FORWARD, GL_COMPILE); > glDisable (GL_CULL_FACE); > glMaterialfv (GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mat_blue); > logo_draw_g_plane (); /* My user function that calls the actual > gl* to draw */ > glEnable (GL_CULL_FACE); > > glMaterialfv (GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mat_black); > logo_draw_i (); /* My user function that calls the actual gl* to > draw */ > glEndList (); > > > Hope this helps, > Shawn > > > > > i'm EMAILING FOR THE GREATER GOOD > Join me > <http://im.live.com/Messenger/IM/Home/?source=EML_WLHM_GreaterGood> > > > > > Date: Tue, 9 Feb 2010 17:15:24 +0000 > > From: [email protected] > > To: [email protected] > > Subject: [GtkGLExt] Is it possible to use overlays with gtkglextmm? > > > > Greetings, > > > > I have been writing, as my first significant project using OpenGL, a GUI > > using gtkglextmm for viewing large datasets as a cloud of points. I have > > some measuring tools that are currently rendered by drawing some of the > > points and then the line or box of the tool while the user is dragging > > the cursor. This works well with small datasets but gets sluggish with > > the larger ones, particularly the ones that require caching. I would > > like to use overlays as a conceptually and practically simple (I hope) > > way of drawing the rulers (and so on) without having to redraw the > > points each time. > > > > How do I do this while using gtkglextmm? I found the method > > Gdk::GL::Config::get_layer_plane() but no other obvious things in the > > documentation. Looking at an example using WGL, it appears I need to > > create an "layer context" for the overlay, but I do not see how to do > > that in gtkglextmm. Does it work in a similar way and, if so, how? > > > > Thanks in advance, > > > > Haraldur > > > > > -------------------------------------------------------------------------------- > > Plymouth Marine Laboratory > > > > Registered Office: > > Prospect Place > > The Hoe > > Plymouth PL1 3DH > > > > Website: www.pml.ac.uk > > Registered Charity No. 1091222 > > PML is a company limited by guarantee > > registered in England & Wales > > company number 4178503 > > > > PML is a member of the Plymouth Marine Sciences Partnership > > Website: www.pmsp.org.uk > > > -------------------------------------------------------------------------------- > > This e-mail, its content and any file attachments are confidential. > > > > If you have received this e-mail in error please do not copy, > disclose it to any third party or use the contents or attachments in > any way. 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