   Blank screen
  Hello, hi, ola oi hej hel hul hal whatever!I'm using SDL and OpenGL for a game project. It works *perfect* under my own computer, which has Ubuntu 5.10 (Breezy badger, GNOME)..and the problem is, that it doesn't show anything on the screen except white for other people! =/It is tested under Debian Etch and Fedora Core, also twice under different Windows comps (Ofcourse compiled on them to get the .exe). It can't be about texture loading, since I can't draw quads or triangles either.What could be the problem?   
  Put glGetError in a few key places and check if you are getting any errors.;  I get GL_INVALID_OPERATION all the time...where could the problem be?   ;Quote:Original post by D-SlicerI get GL_INVALID_OPERATION all the time...where could the problem be?Lots of gl functions throw INVALID_OPERATION. Narrow it down to the *first* call which triggers it, then look that function up in the docs. That'll tell you what you're doing wrong.In other words, RTFM.   ;  Mkay, after some debugging I see that SDL_CreateThread has some problems =Oint func(void* param){glGetError~}SDL_CreateThread(func, (void*)&param;any ideas..?   ;  your ogl context may be not available in the thread.   ;Quote:Original post by D-SlicerMkay, after some debugging I see that SDL_CreateThread has some problems =Oint func(void* param){glGetError~}SDL_CreateThread(func, (void*)&param;any ideas..?I don't know what SDL_CreateThread does behind the scenes, but a thread must have a current OpenGL context in order to call OpenGL functions.  Are you setting a current context for that new thread?  In Windows this is done with wglMakeCurrent.  SDL probably has its own cross-platform way to do it.Using one OpenGL context in more than one thread is usually a bad idea.  I recommend doing whatever needs to be done to prepare the data in the separate thread (ie: loading files) and then sending that data to OpenGL in the OpenGL thread.EDIT:  I don't see how this would be working perfectly on your system, however I don't know too much about multithreading in Linux.   