Hi Matt,
I think the intended use was to provide glxinfo-like information from the
app's perspective, i.e. if it asked for a compatibility context or
something like that. That was how I discovered it, I wanted to get at the
list of extensions that was being given to the app as it was different than
what glxinfo was reporting.
Other than that I'm not sure of it's usefulness.
Courtney
On Wed, Oct 23, 2013 at 3:05 PM, Matt Turner <matts...@gmail.com> wrote:
> On Wed, Oct 23, 2013 at 12:41 PM, Courtney Goeltzenleuchter
> <court...@lunarg.com> wrote:
> > If a user set MESA_INFO and the OpenGL application uses a
> > 3.0 or later context then the MESA_INFO debug output will have
> > an error when it queries for extensions using the deprecated
> > enum GL_EXTENSIONS. Passing context argument allows code
> > to return extension list directly regardless of profile.
> > ---
> > src/mesa/main/context.c | 2 +-
> > src/mesa/main/debug.c | 10 +++++++---
> > src/mesa/main/debug.h | 2 +-
> > 3 files changed, 9 insertions(+), 5 deletions(-)
> >
> > diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
> > index 0d1f71c..8218153 100644
> > --- a/src/mesa/main/context.c
> > +++ b/src/mesa/main/context.c
> > @@ -1522,7 +1522,7 @@ _mesa_make_current( struct gl_context *newCtx,
> > * information.
> > */
> > if (_mesa_getenv("MESA_INFO")) {
> > - _mesa_print_info();
> > + _mesa_print_info(newCtx);
> > }
> >
> > newCtx->FirstTimeCurrent = GL_FALSE;
> > diff --git a/src/mesa/main/debug.c b/src/mesa/main/debug.c
> > index 9434c1e..99b2147 100644
> > --- a/src/mesa/main/debug.c
> > +++ b/src/mesa/main/debug.c
> > @@ -103,7 +103,7 @@ _mesa_print_state( const char *msg, GLuint state )
> > /**
> > * Print information about this Mesa version and build options.
> > */
> > -void _mesa_print_info( void )
> > +void _mesa_print_info( struct gl_context *ctx )
> > {
> > _mesa_debug(NULL, "Mesa GL_VERSION = %s\n",
> > (char *) _mesa_GetString(GL_VERSION));
> > @@ -111,8 +111,12 @@ void _mesa_print_info( void )
> > (char *) _mesa_GetString(GL_RENDERER));
> > _mesa_debug(NULL, "Mesa GL_VENDOR = %s\n",
> > (char *) _mesa_GetString(GL_VENDOR));
> > - _mesa_debug(NULL, "Mesa GL_EXTENSIONS = %s\n",
> > - (char *) _mesa_GetString(GL_EXTENSIONS));
> > +
> > + /* use ctx as GL_EXTENSIONS will not work on 3.0 or higher
> > + * core contexts.
> > + */
> > + _mesa_debug(NULL, "Mesa GL_EXTENSIONS = %s\n",
> ctx->Extensions.String);
>
> I think I'd go ahead and make the same change for version, renderer,
> and vendor now that the context is directly available.
>
> Although, I've never heard of MESA_INFO before. It doesn't appear in
> any of my IRC logs going back to April 2011 so I don't think anyone
> else even knows about it, much less suggests it for debugging. It's
> also not mentioned in the Mesa docs.
>
> I don't see any information in it that would be useful that glxinfo
> doesn't already provide. Maybe we should just throw the whole function
> out.
>
--
Courtney Goeltzenleuchter
LunarG
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