[bug#45861] Add embree and update Blender

[Christopher Lemmer Webber]

Two patches attached.  Embree seems necessary for the newer Blender.

(Sadly newer Blender also still has graphics crashes on my GPU.  Wah!
Well, enjoy to those of you who can.)

>From f584d5784087e2a795c9be28294582b3ca79f085 Mon Sep 17 00:00:00 2001
From: Christopher Lemmer Webber <cwebber@dustycloud.org>
Date: Wed, 13 Jan 2021 14:45:39 -0500
Subject: [PATCH 1/2] gnu: Add embree.

* gnu/packages/graphics.scm (embree): New variable.
---
 gnu/packages/graphics.scm | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/gnu/packages/graphics.scm b/gnu/packages/graphics.scm
index def3dc6913..09cf47b66a 100644
--- a/gnu/packages/graphics.scm
+++ b/gnu/packages/graphics.scm
@@ -428,6 +428,36 @@ with the @command{autotrace} utility or as a C library, 
@code{libautotrace}.")
       (license (list license:gpl2+         ;for the utility itself
                      license:lgpl2.1+))))) ;for use as a library
 
+(define-public embree
+  (package
+    (name "embree")
+    (version "3.12.1")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/embree/embree";)
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0aznd16n7h8g3f6jcahzfp1dq4r7wayqvn03wsaskiq2dvsi4srd"))))
+    (build-system cmake-build-system)
+    (arguments
+     `(#:tests? #f ; no tests (apparently)
+       #:configure-flags
+         (list
+          "-DEMBREE_ISPC_SUPPORT=OFF")))
+    (inputs
+     `(("tbb" ,tbb)
+       ("glfw" ,glfw)))
+    (home-page "https://www.embree.org/";)
+    (synopsis "High performance ray tracing kernels")
+    (description
+     "Embree is a collection of high-performance ray tracing kernels.
+Embree is meant to increase performance of photo-realistic rendering
+applications.")
+    (license license:asl2.0)))
+
 (define-public blender
   (package
     (name "blender")
-- 
2.30.0

>From ce00650a374bd4a4bb866e5492dd2483222323f8 Mon Sep 17 00:00:00 2001
From: Christopher Lemmer Webber <cwebber@dustycloud.org>
Date: Wed, 13 Jan 2021 14:46:23 -0500
Subject: [PATCH 2/2] gnu: blender: Update to 2.91.0.

* gnu/packages/graphics.scm (blender): Update to 2.91.0 and add embree as a
  dependency.
---
 gnu/packages/graphics.scm | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/gnu/packages/graphics.scm b/gnu/packages/graphics.scm
index 09cf47b66a..01f0671ddc 100644
--- a/gnu/packages/graphics.scm
+++ b/gnu/packages/graphics.scm
@@ -461,14 +461,14 @@ applications.")
 (define-public blender
   (package
     (name "blender")
-    (version "2.83.9")
+    (version "2.91.0")
     (source (origin
               (method url-fetch)
               (uri (string-append "https://download.blender.org/source/";
                                   "blender-" version ".tar.xz"))
               (sha256
                (base32
-                "106w9vi6z0gi2nbr73g8pm40w3wn7dkjcibzvvzbc786yrnzvkhb"))))
+                "0x396lgmk0dq9115yrc36s8zwxzmjr490sr5n2y6w27y17yllyjm"))))
     (build-system cmake-build-system)
     (arguments
       (let ((python-version (version-major+minor (package-version python))))
@@ -540,7 +540,8 @@ applications.")
        ("python" ,python)
        ("python-numpy" ,python-numpy)
        ("tbb" ,tbb)
-       ("zlib" ,zlib)))
+       ("zlib" ,zlib)
+       ("embree" ,embree)))
     (home-page "https://blender.org/";)
     (synopsis "3D graphics creation suite")
     (description
-- 
2.30.0