On Thursday 01 March 2007 02:40, you wrote:
> Or you can create a quadric the first time draw-gadget* is called, then
Ah yes. I remember using this technique for lindenmayer (now apps/lsys). The
problem was that I wanted to use opengl display lists with slate. A slate
looks like:
TUPLE: slate action dim ;
And it's draw-gadget* method is:
M: slate draw-gadget* ( slate -- )
origin get swap slate-action with-translation ;
Basically what's happening is the action slot (which is a quot) is called.
I found that to make a display list work, I can't just make the list from any
old place in factor. The list must be generated by the slate gadget itself.
So I have to do something like this:
[
dlist> GL_COMPILE glNewList
<<<opengl commands>>>
glEndList
]
slate>
set-slate-action
Then "redraw" the slate, for the purpose of calling the above code to make the
display list:
slate> relayout-1
Finally, I can use the display list:
[ opengl commands... dlist> glCallList ]
slate>
set-slate-action
This (and the similar solutions for quadrics) are kludgy. There should be a
better way to explictly initialize contexts in the case that you are setting
one up for an application or demo. Idioms and styles from general opengl
programming should carry over to opengl programming in Factor when possible.
Ed
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