From d083f0f87f390497162eae4ab6b9a34d65e1ecd8 Mon Sep 17 00:00:00 2001
From: Eric Wasylishen <ewasylishen@gmail.com>
Date: Wed, 29 Jan 2020 21:14:55 -0700
Subject: [PATCH] qbsp: parallelize PartitionSurfaces

---
 qbsp/solidbsp.cc | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/qbsp/solidbsp.cc b/qbsp/solidbsp.cc
index 220ad2e9..c9bad28f 100644
--- a/qbsp/solidbsp.cc
+++ b/qbsp/solidbsp.cc
@@ -23,6 +23,8 @@
 
 #include <qbsp/qbsp.hh>
 
+#include "tbb/task_group.h"
+
 int splitnodes;
 
 static int leaffaces;
@@ -970,8 +972,10 @@ PartitionSurfaces(surface_t *surfaces, node_t *node)
         }
     }
 
-    PartitionSurfaces(frontlist, node->children[0]);
-    PartitionSurfaces(backlist, node->children[1]);
+    tbb::task_group g;
+    g.run([&](){ PartitionSurfaces(frontlist, node->children[0]); });
+    g.run([&](){ PartitionSurfaces(backlist, node->children[1]); });
+    g.wait();
 }