Simulation: move initial simulation code from bf_blenkernel to bf_simulation

I removed bf_blenkernel from `nodes/CMakeLists.txt` again (added it yesterday),
because now this was causing me unresolved symbol errors... Without it, cmake
seems to link the libraries bf_simulation, bf_blenkernel and bf_nodes in the right
order. Not sure if that is just luck or if it is guaranteed.

It was possible to fix the issue by using cmakes `LINK_INTERFACE_MULTIPLICITY`,
but that is probably bad style.

1 files changed, 32 insertions, 0 deletions

diff --git a/source/blender/simulation/SIM_simulation_update.hh b/source/blender/simulation/SIM_simulation_update.hh
new file mode 100644
index 00000000000..40b62bfb58a
--- /dev/null
+++ b/source/blender/simulation/SIM_simulation_update.hh
@@ -0,0 +1,32 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __SIM_SIMULATION_UPDATE_HH__
+#define __SIM_SIMULATION_UPDATE_HH__
+
+struct Depsgraph;
+struct Scene;
+struct Simulation;
+
+namespace blender::sim {
+
+void update_simulation_in_depsgraph(Depsgraph *depsgraph,
+                                    Scene *scene_cow,
+                                    Simulation *simulation_cow);
+
+}
+
+#endif /* __SIM_SIMULATION_UPDATE_HH__ */