[vtkusers] Somehow mesa-12 first rendering is slow

[Edson Contreras Cárdenas]

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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