[Bf-blender-cvs] [79e529c5ec1] blender-v2.83-release: Fix T77109: Cycles viewport render crash after object add and undo

[Brecht Van Lommel]

Commit: 79e529c5ec16d644693c1a71790819e020a293cd
Author: Brecht Van Lommel
Date:   Wed May 27 18:00:59 2020 +0200
Branches: blender-v2.83-release
https://developer.blender.org/rB79e529c5ec16d644693c1a71790819e020a293cd

Fix T77109: Cycles viewport render crash after object add and undo

===================================================================

M	intern/cycles/blender/blender_session.cpp
M	intern/cycles/blender/blender_sync.cpp
M	intern/cycles/blender/blender_sync.h

===================================================================

diff --git a/intern/cycles/blender/blender_session.cpp b/intern/cycles/blender/blender_session.cpp
index 5ea96d6bdfd..ed90d054d73 100644
--- a/intern/cycles/blender/blender_session.cpp
+++ b/intern/cycles/blender/blender_session.cpp
@@ -168,9 +168,13 @@ void BlenderSession::create_session()
 
 void BlenderSession::reset_session(BL::BlendData &b_data, BL::Depsgraph &b_depsgraph)
 {
+  /* Update data, scene and depsgraph pointers. These can change after undo. */
   this->b_data = b_data;
   this->b_depsgraph = b_depsgraph;
   this->b_scene = b_depsgraph.scene_eval();
+  if (sync) {
+    sync->reset(this->b_data, this->b_scene);
+  }
 
   if (preview_osl) {
     PointerRNA cscene = RNA_pointer_get(&b_scene.ptr, "cycles");
diff --git a/intern/cycles/blender/blender_sync.cpp b/intern/cycles/blender/blender_sync.cpp
index e8031be7dd1..90736b7630d 100644
--- a/intern/cycles/blender/blender_sync.cpp
+++ b/intern/cycles/blender/blender_sync.cpp
@@ -78,6 +78,14 @@ BlenderSync::~BlenderSync()
 {
 }
 
+void BlenderSync::reset(BL::BlendData &b_data, BL::Scene &b_scene)
+{
+  /* Update data and scene pointers in case they change in session reset,
+   * for example after undo. */
+  this->b_data = b_data;
+  this->b_scene = b_scene;
+}
+
 /* Sync */
 
 void BlenderSync::sync_recalc(BL::Depsgraph &b_depsgraph, BL::SpaceView3D &b_v3d)
diff --git a/intern/cycles/blender/blender_sync.h b/intern/cycles/blender/blender_sync.h
index 650b4f5bb4e..f0ea5194c29 100644
--- a/intern/cycles/blender/blender_sync.h
+++ b/intern/cycles/blender/blender_sync.h
@@ -61,6 +61,8 @@ class BlenderSync {
               Progress &progress);
   ~BlenderSync();
 
+  void reset(BL::BlendData &b_data, BL::Scene &b_scene);
+
   /* sync */
   void sync_recalc(BL::Depsgraph &b_depsgraph, BL::SpaceView3D &b_v3d);
   void sync_data(BL::RenderSettings &b_render,