Re: [Mesa3d-users] how to switch between hardware rendering and Mesa rendering

[Chia-I Wu <ol...@gm...>]

On Tue, Oct 27, 2009 at 01:45:56AM +0100, Florent Monnier wrote:
> In my Linux system I have installed the proprietary drivers for my video card, 
> But I would like to test a program with the Mesa rendering.
> (Because the driver doesn't seems to support glsl and I would like to test a 
> program with it)
> So I have tryed to do what I have done before with other libs, which is I have 
> installed Mesa with ./configure --prefix=/tmp/Mesa and then after the install 
> I do: export LD_LIBRARY_PATH=/tmp/Mesa/lib
> Then I run my program in the same session. With other libs this works fine, 
> but here my program still run with the hardware accelerattion.
> So you guess the question, how can I test a program with Mesa without 
> uninstalling my hardware drivers ?
With LD_LIBRARY_PATH set, you can

$ ldd <your-program>

to verify the libraries from mesa are used.  If it already is, and you
are under X, you can run

$ glxinfo

to see if it is doing direct rendering, and which renderer is used.

If glxinfo reports direct rendering, you can make sure the software DRI
driver is used by setting LIBGL_ALWAYS_SOFTWARE=1.

Another way is to use a Xlib-based GLX emulation.  You can configure
mesa with

$ ./configure --with-driver=xlib

to have a libGL.so that does not talk GLX.

-- 
Regards,
olv