A funny thing happened on the way to drawGLScene…
if (glXGetCurrentContext() == NULL)
printf ("No Context\n");
No Context
No Context
No Context
No Context
No Context
No Context
No Context
No Context
No Context
Seems your context is never getting created here. I tried following this
up by adding a vid_inited global which inits to false and set it true
after SDL_SetVideoMode returned screen, and made the draw function bail if
it was not true, before checking for context or anything. I still get the
above output, which means that screen is returning non-NULL and there is
no context.
It looks like SDL_VideoInfo does not contain a field for whether or not
SDL can create an OpenGL context or not - it should. Since it doesn’t, we
need to check that we actually got a surface back, no problem since you
already had this:
/* Verify there is a surface */
if ( ! screen )
{
fprintf( stderr, "Video mode set failed: %s\n", SDL_GetError( ) );
SDL_Quit();
exit( 1 );
}
…so I just modified it to also check for the proper flag:
if ( ! screen || !(screen->flags & SDL_OPENGL) )
{
fprintf( stderr, "Video mode set failed: %s\n", SDL_GetError( ) );
SDL_Quit();
exit( 1 );
}
No bail. And still no context. Looks like the context is either not
created or not made current. Either way, this is a bug in SDL by the
looks of it.On Thu, Oct 18, 2001 at 08:55:17PM +0000, Stephane Chauveau wrote:
I am looking for a method to display an SDL surface using OpenGL
in a GTK widget. Having the SDL/OpenGL and the Gtk widgets in
separate windows could be enough.
I tried without success to combine the Gtk-demo (see below)
with one of the NeHe demos (lesson4).
My current non-working program is in
http://members.brabant.chello.nl/~s.chauveau/pub/gtk-demo.c
It compile and execute fine but do not display the OpenGL
surface.
–
Joseph Carter Free software developer
Mercury, isn’t debugging X a little like finding perfectly
bugfree code in windows ??
WildCode: Debugging X is like trying to run a straight line
through a maze.
You just need to bend space-time so that the corners move around
you and you won’t have any problems. (=:]
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