>
>
> Hi Sven,
> i've tried new builds from repository (namely jogl b705), still the same
> error. No more test outputs this time, just
> pathway to solution. Lets start what jogl behaviour is different between
> mesa versions 7 and 8. While you have
> *mesa 7xx*, following lines (from newest sources, added in latest commit) in
> X11GLXContext.java (lines 342+)
> results in false:
>
> final boolean isProcCreateContextAttribsARBAvailable =
> isFunctionAvailable("glXCreateContextAttribsARB");
> final boolean isExtARBCreateContextAvailable =
> isExtensionAvailable("GLX_ARB_create_context");
> if ( isProcCreateContextAttribsARBAvailable &&
> isExtARBCreateContextAvailable )
>      contextHandle = createContextARB(share, direct);
> ...
> so this if condition is not met. Ok, contextHandle was and still is 0,
> nothing changed... after a while code
> continues with old temporary context (line 380 +). From now on, everything
> is *OK* with *mesa 7xx*.
>
> Now the difference - after switching to *mesa 8xx*,  the ARB functions are
> available and (lines 342, 343)
> results in true, but still (line 346):
>
> contextHandle = createContextARB(share, direct);
>
> *returns 0* and this behaviour leads to both parts of my problem.

> In
> GLContextImpl class on line 664 (body of
> previously mentioned method createContextARB(...)) is a method call:
>
> mapGLVersions(device);
>
> inside of this method are several calls of
> createContextARBMapVersionsAvailable(...) functions. Each call of
> this method* resets context states* (GLContextImpl.java line 776) so that
> *gl* property of
> X11GLXContext instance becomes null.

> Ok, some code runs until we are back to
> X11GLXContext, boolean flag
> createContextARBTried is set to true and contextHandle is still 0. Code
> continues as usually with old temporary
> context. Seems ok, code runs well until makeCurrent is called. Precisely
> line 470 in class GLContextImpl.
> There is verification of profiles:
>
> getGLDrawable().getGLProfile().verifyEquality(gl.getGLProfile());
>
> where, as I described, *gl* property is now null -> throws naturally
> nullpointerexception...
> This is only one part of my problem. At start, I tried restoring *gl*
> property with setGLFunctionAvailability(..)
> method only, but i found that last internal part of mapGLVersions() method
> modifies *deviceVersionsAvailableSet* property of our context instance and
> this *finally* causes my
> mismatch in profiles.
>
> So, that's all to the description of my problems, I've continued my research
> in code and found a solution:
> Insert following code  after line number 370 in X11GLXContext.java, so that
> *gl* property null state is
> prohibited and deviceVersionsAvailableSet are regenerated... But I don't
> know if this is the best solution...
>
> if(this.gl == null)
> {
>   //clear deviceVersionsAvailableSet, which was set in createContextARB(...)
>   shutdown();
>  
>   //set back temp context as current
>   if (!glXMakeContextCurrent(display, drawable.getHandle(),
> drawableRead.getHandle(), temp_ctx)) {
>     throw new GLException("Error making temp context(1) current: display
> "+toHexString(display)+", context "+toHexString(temp_ctx)+", drawable
> "+drawable);
>   }
>  
>   //refresh functions etc.
>   setGLFunctionAvailability(true, 0, 0, CTX_PROFILE_COMPAT); // use
> GL_VERSION
> }
>
>>From this point, everything works on my machine with mesa 8. Please let me
> know what you think about it.