[vtkusers] Somehow mesa-12 first rendering is slow

[Chuck Atkins]

Hi Edson,
It looks like you're getting llvmpipe correctly so that's good.  Your
suspicion regarding the llvm build is a good place to start.  If you look
in the el6/Dockerfile in the repo I sent you, you can see the entire build
configuration of the image, including llvm.  Try configuring llvm with
CMake instead of autotools using the following:

cmake \
  -DCMAKE_BUILD_TYPE=Release \
  -DCMAKE_INSTALL_PREFIX=/path/to/llvm/install \
  -DLLVM_BUILD_LLVM_DYLIB=ON \
  -DLLVM_ENABLE_RTTI=ON \
  -DLLVM_TARGETS_TO_BUILD=X86 \
  -DLLVM_INSTALL_UTILS=ON \
  /path/to/llvm/source


- Chuck

On Tue, Jul 12, 2016 at 3:46 PM, Edson Contreras Cárdenas <edrecon at gmail.com
> wrote:

> Hello world,
>
> I'm trying to get running my application with VTK-7.0-OpenGL2 and
> mesa-12.0 and it gets slow with the first render. (after I call
> m_renderer->Render() it takes 5-7 seconds to show the image and after that
> everything goes smooth and ok)
>
> The thing is that I try Chuck's libGL.so (paraview pre-built binary) and
> it takes a second or maybe 2 seconds performing the same action, with the
> same actors. I'm building mesa-12.0 with the following configuration: (same
> that Chuck sent me in a mesa-users thread)
>
> OS  = RHEL6.6
> CC  = gcc(5.2.0)
> CXX = g++(5.2.0)
>
> BASELIBS_PREFIX=/remote/sharedLibs
>
> ../mesa-12.0.0/configure \
>     --with-llvm-prefix=${BASELIBS_PREFIX}/llvm-3.8            \
>     --enable-opengl --disable-gles1 --disable-gles2           \
>     --disable-va --disable-gbm --disable-xvmc --disable-vdpau \
>     --enable-shared-glapi                                     \
>     --disable-texture-float                                   \
>     --disable-dri --with-dri-drivers=                         \
>     --enable-gallium-llvm --disable-llvm-shared-libs          \
>     --with-gallium-drivers=swrast,swr                         \
>     --disable-egl --disable-gbm --with-egl-platforms=         \
>     --enable-gallium-osmesa                                   \
>     --enable-glx                                              \
>     --prefix=${BASELIBS_PREFIX}/mesa-12.0
>
> edsonc at mesa-tests:~> setenv LD_LIBRARY_PATH
> ${BASELIBS_PREFIX}/mesa-12.0/lib:${LD_LIBRARY_PATH}
>
> edsonc at mesa-tests:~> glxinfo | grep -i opengl
>   OpenGL vendor string: VMware, Inc.
>   OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.8, 128 bits)
>   OpenGL version string: 3.2 (Core Profile) Mesa 12.0.0
>   OpenGL shading language version string: 3.30
>   OpenGL extensions:
>
>
> My guess is that I'm building wrong llvm-3.8 library. In any case, I also
> add the flags of how I built it.
>
>
> ../llvm-3.8.0.src/configure              \
>     --prefix=${BASELIBS_PREFIX}/llvm-3.8 \
>     --disable-shared                     \
>     --enable-optimized                   \
>     --enable-cxx1y
>
>
> The prebuilt binary that I'm referring above, is located under:
>
>
> https://data.kitware.com/#user/56eac32b8d777f0457177859/folder/56eac32b8d777f045717785a
>
> Thanks for your support.
>
> Regards,
> Edson
>
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