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
> Date: Tue, 9 Feb 2010 17:15:24 +0000
> From: harg pml ac uk
> To: gtkglext-list gnome org
> 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
>
>
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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
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