Reposted from fltk.opengl
> I checked the docs and found gl_texture_pile_height, it is set by default to
> 100 so I lowered to 1. The problem is gone.
>
> I'm sure this affects performance so if the problem is a bug that is fixable
> that would be great.
>
> Any clues?
>
> Thanks.
> Daniel
FLTK 1.3 uses textures under Mac OS X because that's the only way to draw
non-ascii text and to make 64-bit applications.
The algorithm is as follows:
- a number N of texture names is allocated the first time gl_draw() is called
by N calls to glGenTextures(1, .). N is 100 by default, but can be changed
calling gl_texture_pile_height(int);
- all strings are then drawn into one of these textures and mapped to the
display with calls to glBindTexture();
- when a new string is to be drawn, a new texture is used, and if no more
texture is available, a previous one is replaced by the new string;
- when a string is to be drawn, the matching texture is re-used if present,
that is, if the same string had been drawn already;
- glDeleteTextures() calls are made on all N textures only when any
Fl_Gl_Window is deleted, or when gl_texture_pile_height(int) is called.
Can you understand why this interferes with your application ?
_______________________________________________
fltk-dev mailing list
[email protected]
http://lists.easysw.com/mailman/listinfo/fltk-dev
