[Bug 260031] graphics/embree: Enable ISPC, add option for BACKFACE_CULLING

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260031

            Bug ID: 260031
           Summary: graphics/embree: Enable ISPC, add option for
                    BACKFACE_CULLING
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: danfe@FreeBSD.org
          Reporter: yuri@freebsd.org
             Flags: maintainer-feedback?(danfe@FreeBSD.org)
          Assignee: danfe@FreeBSD.org

Created attachment 229709
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=229709&action=edit
patch

Hi Alexey,


The attached patch performs these 2 actions:
1. sets ISPC to ON (which is also a default value for it)
2. adds the BACKFACE_CULLING option with OFF as default (which is also a
default value for it)

Both options are restored to their default values.

This is needed for OSPray, an important raytracing library. which explicitly
requires these two Embree options to be at their default values in order to
build.


Thank you,
Yuri

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