Re: [gl4java-usergroup] Problems with textures and gl parameters

[Kenneth B. R. <kbr...@al...>]

> I have a problem, I only can load textures in the display method, or in the
> init, my aplication read a file  with urls of images, and I want to load
> them when I read the text file, but I can't, it says me:
> "GLUT : Warning in (unamed): GL error: operation not valid"
> 
> when I try to execute:
> TextureLoader texLoader = new AWTTextureLoader(this,gl,glu);
> 
> If I execute this in the display function it works ok.

You need a valid OpenGL context in order to make OpenGL calls.
GL4Java automatically makes the context current before calling
display(), init(), reshape(), and a couple of other routines.
While you can force the context to be made current outside of
these routines, you may find it easier to rearrange your
initialization code to run inside these.

In a couple of applications I've written, the keyboard and mouse
callbacks (which execute in the AWT thread without an OpenGL
context available) simply set some state which is then processed
in display().