I'm having a problem here where an application using gl_draw() displays
text on one computer, but not another.
Both machines are running WinXP, SP2.
gl_draw() works fine on a Nvidia GeForce 7800GT, but not on an older ATI
Radeon 9800 Pro. In fact, after running it on a variety of computers with
both nVidia and ATI cards, *only* this particular machine with the
GeForce 7800GT will display the font with gl_draw(). This is very
frustrating :)
Hopefully i'm doing something wrong somewhere that is a simple mistake on
my part.
The strange thing is, piling on loads of gl_font() calls (4 or 5) in a
row with different font sizes can "shock" fltk into displaying the text
correctly, albeit in one particular size, for a brief time (text again
does not display on the next execution of the program - very odd)
in main():
Fl::gl_visual(FL_RGB);
in ::draw() method of my GL viewport class (subclassed from Fl_Gl_Window)
// draw scene here, everything's fine up until this point
// font test
glViewport( 0, 0, w(), h() );
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho( 0, w(), 0, h(), -1.0f, 1.0f );
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glDisable(GL_DEPTH_TEST);
gl_font( FL_HELVETICA, 24 );
// I've tried every imaginable combination of type face and size here
// multiple gl_font calls *sometimes* get it working - temporarily :(
glColor3ub( 255, 255, 255 ); // white
glRasterPos2f( w()/2.0f, h()/2.0f ); // middle of screen
gl_draw( "TESTTESTTEST", 0.0f, 0.0f );
On the machine with the 7800GT, this displays "TESTTESTTEST" in huge
white letters right smack dab in the center of the screen where it should
be.
Every other machine i've tried it on...
... nothing.
Any ideas? I've run out of them :)
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