On 03/13/2013 04:11 AM, jupiter wrote:
Hi Brian,
Sorry for not being clear, let me clarify it.
On 3/13/13, Brian Paul<bri...@vmware.com> wrote:
Well, the Xlib/swrast driver does everything in software, unlike a DRI
driver which does most things with the GPU. Xlib will always be slower.
My local test machine graphic card does not have hardware
acceleration, it does not support OpenGL, it does not have NVIDIA. I
guess the DRI driver may still implement software GL even though it
might access some basic functions of the low budget graphic card, but
correct me, if I am using wrong terminology.
Yes, swrast may also be used via DRI, when there's no DRI driver for
the hardware GPU or when the hardware driver needs a software fallback.
The gallium llvmpipe driver should be quite a bit faster.
Just install LLVM first, then reconfigure/rebuild Mesa, set your
LD_LIBRARY_PATH to the lib/gallium/ directory and you should get llvmpipe.
Yes, I have already built the Mesalib with LLVM, I posted the
configuration in my last email, let me post it again.
${SOURCE}/${CONFIGURE} --prefix=${INSTALL} --enable-xlib-glx
--disable-dri --enable-gallium-llvm --with-llvm-shared-libs
It did not produce a faster result, it was virtually not much
differences when I run Chimera comparing to use of
--with-gallium-drivers=swrast unless my configuration is wrong. Please
let me know a correct version of configuration for llvmpipe. The
libdrm version is 2.4.42. The libllvm version is 3.2.
libdrm is irrelevant for llvmpipe.
I can also use a test program to measure Mesa in different drivers if
you could let me know which test program can be used for benchmarking
the Mesalib using different drivers of swrast, or llvm or DRI? And
where is the test program source code I can download from?
The Mesa demos git tree can be cloned per
http://www.mesa3d.org/repository.html
Please also see attached glxinfo for Mesa llvm.
The key line is "OpenGL renderer string: Mesa X11". That's not
llvmpipe. If you're really using llvmpipe it should say something
like "OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.2, 128
bits)".
Perhaps your LD_LIBRARY_PATH env is pointing at the wrong libGL.so
-Brian
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