From e7b9423623d30ff962c926d4ccc6e27f3cba675c Mon Sep 17 00:00:00 2001
From: Jacques Lucke <jacques@blender.org>
Date: Tue, 28 Sep 2021 10:17:00 +0200
Subject: Geometry Nodes: multi-threading when modifying multiple geometry sets

Differential Revision: https://developer.blender.org/D12652
---
 source/blender/blenkernel/intern/geometry_set.cc | 29 ++++++++++++++++--------
 1 file changed, 20 insertions(+), 9 deletions(-)

(limited to 'source/blender')

diff --git a/source/blender/blenkernel/intern/geometry_set.cc b/source/blender/blenkernel/intern/geometry_set.cc
index 3abe2fd2213..e8e2f64d6e1 100644
--- a/source/blender/blenkernel/intern/geometry_set.cc
+++ b/source/blender/blenkernel/intern/geometry_set.cc
@@ -15,6 +15,7 @@
  */
 
 #include "BLI_map.hh"
+#include "BLI_task.hh"
 
 #include "BKE_attribute.h"
 #include "BKE_attribute_access.hh"
@@ -458,28 +459,38 @@ void GeometrySet::gather_attributes_for_propagation(
   delete dummy_component;
 }
 
-/**
- * Modify every (recursive) instance separately. This is often more efficient than realizing all
- * instances just to change the same thing on all of them.
- */
-void GeometrySet::modify_geometry_sets(ForeachSubGeometryCallback callback)
+static void gather_mutable_geometry_sets(GeometrySet &geometry_set,
+                                         Vector<GeometrySet *> &r_geometry_sets)
 {
-  callback(*this);
-  if (!this->has_instances()) {
+  r_geometry_sets.append(&geometry_set);
+  if (!geometry_set.has_instances()) {
     return;
   }
   /* In the future this can be improved by deduplicating instance references across different
    * instances. */
-  InstancesComponent &instances_component = this->get_component_for_write<InstancesComponent>();
+  InstancesComponent &instances_component =
+      geometry_set.get_component_for_write<InstancesComponent>();
   instances_component.ensure_geometry_instances();
   for (const int handle : instances_component.references().index_range()) {
     if (instances_component.references()[handle].type() == InstanceReference::Type::GeometrySet) {
       GeometrySet &instance_geometry = instances_component.geometry_set_from_reference(handle);
-      instance_geometry.modify_geometry_sets(callback);
+      gather_mutable_geometry_sets(instance_geometry, r_geometry_sets);
     }
   }
 }
 
+/**
+ * Modify every (recursive) instance separately. This is often more efficient than realizing all
+ * instances just to change the same thing on all of them.
+ */
+void GeometrySet::modify_geometry_sets(ForeachSubGeometryCallback callback)
+{
+  Vector<GeometrySet *> geometry_sets;
+  gather_mutable_geometry_sets(*this, geometry_sets);
+  blender::threading::parallel_for_each(
+      geometry_sets, [&](GeometrySet *geometry_set) { callback(*geometry_set); });
+}
+
 /** \} */
 
 /* -------------------------------------------------------------------- */
-- 
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