From b1460e25c5f967fe886849d560b11d406b8f0dcc Mon Sep 17 00:00:00 2001
From: Andrew Marshall <andrew@johnandrewmarshall.com>
Date: Fri, 22 Sep 2023 16:01:09 -0400
Subject: [PATCH 1/2] openpgl: init at 0.5.0

Setting TBB_ROOT to the out path is necessary as otherwise the bundled
FindTBB.cmake tries to search the `tbb.dev` output for the library
files.

Note that embree and nanoflann are bundled within the source. The build
system is not currently setup to use non-vendored libs.

Rebuilt 25 times to test reproducibility.

Attempted a build on x86_64-darwin, and it failed, so marking this as
linux only.
---
 pkgs/by-name/op/openpgl/package.nix | 41 +++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 pkgs/by-name/op/openpgl/package.nix

diff --git a/pkgs/by-name/op/openpgl/package.nix b/pkgs/by-name/op/openpgl/package.nix
new file mode 100644
index 000000000000..6c94e9edfe50
--- /dev/null
+++ b/pkgs/by-name/op/openpgl/package.nix
@@ -0,0 +1,41 @@
+{ lib
+, cmake
+, fetchFromGitHub
+, ninja
+, stdenv
+, tbb
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "openpgl";
+  version = "0.5.0";
+
+  src = fetchFromGitHub {
+    owner = "OpenPathGuidingLibrary";
+    repo = finalAttrs.pname;
+    rev = "v${finalAttrs.version}";
+    hash = "sha256-dbHmGGiHQkU0KPpQYpY/o0uCWdb3L5namETdOcOREgs=";
+  };
+
+  nativeBuildInputs = [
+    cmake
+    ninja
+  ];
+
+  buildInputs = [
+    tbb
+  ];
+
+  cmakeFlags = [
+    "-DOPENPGL_BUILD_STATIC=OFF"
+    "-DTBB_ROOT=${tbb.out}"
+  ];
+
+  meta = {
+    description = "Intel Open Path Guiding Library";
+    homepage = "https://github.com/OpenPathGuidingLibrary/openpgl";
+    platforms = lib.platforms.linux;
+    maintainers = [ lib.maintainers.amarshall ];
+    license = lib.licenses.asl20;
+  };
+})

From 0c4a07bf9f3cc6438c0c5e00dd6d6055bd65e0bf Mon Sep 17 00:00:00 2001
From: Andrew Marshall <andrew@johnandrewmarshall.com>
Date: Fri, 22 Sep 2023 16:02:26 -0400
Subject: [PATCH 2/2] blender: enable path guiding support

https://wiki.blender.org/wiki/Reference/Release_Notes/3.4/Cycles#Path_Guiding
---
 pkgs/applications/misc/blender/default.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkgs/applications/misc/blender/default.nix b/pkgs/applications/misc/blender/default.nix
index 9fb6720fddaa..0b368ef1b315 100644
--- a/pkgs/applications/misc/blender/default.nix
+++ b/pkgs/applications/misc/blender/default.nix
@@ -15,6 +15,7 @@
 , potrace
 , openxr-loader
 , embree, gmp, libharu
+, openpgl
 , mesa
 , runCommand
 }:
@@ -58,6 +59,7 @@ stdenv.mkDerivation (finalAttrs: rec {
       potrace
       libharu
       libepoxy
+      openpgl
     ]
     ++ lib.optionals waylandSupport [
       wayland wayland-protocols libffi libdecor libxkbcommon dbus