[Paraview] OffScreen/OnScreen, Software/Hardware Rendering with EGL

[Jacques Papper]

Thanks Utkarsh,

For Build D, since you build with VTK_USE_X=ON, can you use pvbatch on a
machine that doesn't have an X server?
If so, is there anything to do in particular at runtime?

Also, is it possible to build the paraview client gui with VTK_USE_X=OFF ?

Does Build E allow to build the paraview client gui  ?

Best,
Jacques





On Mon, May 22, 2017 at 7:05 PM, Utkarsh Ayachit <
utkarsh.ayachit at kitware.com> wrote:

> Jacques,
>
> Here's a quick summary of modes available currently, with their
> requirements and features supported. A and B do not need any special build,
> while all other modes do.
>
> ParaView 5.3 configuration Requires X-server Supports H/W rendering Supports
> Software Rendering
> Yes No Yes No Yes No
> A Default ✔ ✔ ✔
> B Default with Mesa libGL ✔ ✔ ✔
> C OSMesa only ✔ ✔ ✔
> D OSMesa + Mesa libGL ✔ ✔ ✔ ✔
> E EGL only ✔ ✔ ✔
> A. assuming libGL is provided by GPU vendor
> B. uses same build as A, simply change LD_LIBRARY_PATH to load libGL
> provided Mesa3D
> C. Special build ParaView with VTK_OPENGL_HAS_OSMESA=ON, VTK_USE_X=OFF
> D. Special build of ParaView with VTK_OPENGL_HAS_OSMESA=ON, VTK_USE_X=ON
> and OPENGL_gl_LIBRARY set to point to libGL from same Mesa build proviing
> libOSMesa.
> E. Special build of ParaView with VTK_USE_OFFSCREEN_EGL=ON.
>
> We have plans to add support for another mode where you can use EGL +
> libGL (similar to D but with H/W rendering support). That may happen later
> this year.
>
> Hope that helps.
>
> Utkarsh
>
>
> On Mon, May 22, 2017 at 12:20 PM, Jacques Papper <jacques.papper at gmail.com
> > wrote:
>
>> Hi,
>>
>> I would like to know if it is possible to build ParaView 5.3.0 (Client as
>> well as Server / Batch etc...) in one go with off-screen / on-screen, GPU
>> and software support. (i.e 4 different combinations possible)
>>
>> My understanding is that EGL is a step forward in allowing this as it
>> should provide the ability to use the GPU in off-screen contexts ?
>>
>> I know that the current ParaView 5.3.0 installation supports both CPU and
>> GPU rendering by swapping out the OpenGL2 libs at runtime (the MESA OpenGL
>> libs are put in the mesa subfolder).
>>
>> However, I haven't figured out if it is possible to have off-screen and
>> on-screen rendering activated / de-activated at runtime ? And if so, is it
>> only for the software rendering capability or for the hardware rendering
>> capability as well ?
>>
>> If it is possible to have all 4 possibilities selectable at runtime, what
>> are the build options to enable this ?
>>
>> Even if I need to do separate builds and swap out the libs at runtime
>> that would be fine !
>>
>> Thanks !
>> Jacques
>>
>>
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