[GRASS-dev] Re: [GRASS-user] [bug #3041] nviz max resolution ppm image dump

[Hamish]

Glynn Clements wrote:
> > With off-screen rendering disabled, I get good results with either
> > of the above var_i calculations.
> 
> The off-screen rendering draws to the back-buffer, GS_write_zoom()
> dumps the front buffer. Also, Create_OS_Ctx() hides the Togl canvas
> (presumably to prevent expose events from trashing the OpenGL state
> during off-screen rendering), so it probably isn't usable for
> rendering.
> 
> Does this help?
> 
> diff -u -r2.6 do_zoom.c
> --- visualization/nviz/src/do_zoom.c	9 Jul 2006 08:58:40 -0000	2.6
> +++ visualization/nviz/src/do_zoom.c	31 Aug 2006 12:58:16 -0000
> @@ -325,6 +325,9 @@
>      }
>  #endif
>  
> +    if (!pbuffer && !glxpixmap)
> +	    return 1;
> +
>      /* hide togl canvas before init_ctx 
>       * This prevents bindings from re-initializing
>       * togl */


Nope. No change.

Does max res PPM dump work for anybody? (ie is it a platform dependent
thing)

Shall we disable offscreen rendering for the 6.2 release branch in case
it doesn't get fixed in time for release?


Hamish