From a1318d241553246c266410eb1ae4ba23e73179e1 Mon Sep 17 00:00:00 2001
From: Pablo Dobarro <pablodp606@gmail.com>
Date: Tue, 17 Sep 2019 22:15:58 +0200
Subject: Fix T69580: Smooth brush freezes on highpoly mesh

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5831
---
 source/blender/blenkernel/intern/multires.c  | 19 ++++++++++++++++---
 source/blender/blenkernel/intern/paint.c     | 20 ++++++++++++++++----
 source/blender/editors/sculpt_paint/sculpt.c | 13 ++++++++++++-
 3 files changed, 44 insertions(+), 8 deletions(-)

diff --git a/source/blender/blenkernel/intern/multires.c b/source/blender/blenkernel/intern/multires.c
index 82dfe68dbd6..6a5e31bd2a2 100644
--- a/source/blender/blenkernel/intern/multires.c
+++ b/source/blender/blenkernel/intern/multires.c
@@ -422,9 +422,22 @@ void multires_force_sculpt_rebuild(Object *ob)
 {
   multires_flush_sculpt_updates(ob);
 
-  if (ob && ob->sculpt && ob->sculpt->pbvh != NULL) {
-    BKE_pbvh_free(ob->sculpt->pbvh);
-    ob->sculpt->pbvh = NULL;
+  if (ob && ob->sculpt) {
+    SculptSession *ss = ob->sculpt;
+    if (ss->pbvh) {
+      BKE_pbvh_free(ss->pbvh);
+      ob->sculpt->pbvh = NULL;
+    }
+
+    if (ss->pmap) {
+      MEM_freeN(ss->pmap);
+      ss->pmap = NULL;
+    }
+
+    if (ss->pmap_mem) {
+      MEM_freeN(ss->pmap_mem);
+      ss->pmap_mem = NULL;
+    }
   }
 }
 
diff --git a/source/blender/blenkernel/intern/paint.c b/source/blender/blenkernel/intern/paint.c
index 5980aa456e2..9c56e505d91 100644
--- a/source/blender/blenkernel/intern/paint.c
+++ b/source/blender/blenkernel/intern/paint.c
@@ -992,10 +992,24 @@ static void sculptsession_free_pbvh(Object *object)
 {
   SculptSession *ss = object->sculpt;
 
-  if (ss && ss->pbvh) {
+  if (!ss) {
+    return;
+  }
+
+  if (ss->pbvh) {
     BKE_pbvh_free(ss->pbvh);
     ss->pbvh = NULL;
   }
+
+  if (ss->pmap) {
+    MEM_freeN(ss->pmap);
+    ss->pmap = NULL;
+  }
+
+  if (ss->pmap_mem) {
+    MEM_freeN(ss->pmap_mem);
+    ss->pmap_mem = NULL;
+  }
 }
 
 void BKE_sculptsession_bm_to_me_for_render(Object *object)
@@ -1210,9 +1224,7 @@ static void sculpt_update_object(
   BLI_assert(pbvh == ss->pbvh);
   UNUSED_VARS_NDEBUG(pbvh);
 
-  MEM_SAFE_FREE(ss->pmap);
-  MEM_SAFE_FREE(ss->pmap_mem);
-  if (need_pmap && ob->type == OB_MESH) {
+  if (need_pmap && ob->type == OB_MESH && !ss->pmap) {
     BKE_mesh_vert_poly_map_create(
         &ss->pmap, &ss->pmap_mem, me->mpoly, me->mloop, me->totvert, me->totpoly, me->totloop);
   }
diff --git a/source/blender/editors/sculpt_paint/sculpt.c b/source/blender/editors/sculpt_paint/sculpt.c
index dc94da1cedf..462249dc572 100644
--- a/source/blender/editors/sculpt_paint/sculpt.c
+++ b/source/blender/editors/sculpt_paint/sculpt.c
@@ -6969,8 +6969,19 @@ void sculpt_pbvh_clear(Object *ob)
   /* Clear out any existing DM and PBVH */
   if (ss->pbvh) {
     BKE_pbvh_free(ss->pbvh);
+    ss->pbvh = NULL;
   }
-  ss->pbvh = NULL;
+
+  if (ss->pmap) {
+    MEM_freeN(ss->pmap);
+    ss->pmap = NULL;
+  }
+
+  if (ss->pmap_mem) {
+    MEM_freeN(ss->pmap_mem);
+    ss->pmap_mem = NULL;
+  }
+
   BKE_object_free_derived_caches(ob);
 
   /* Tag to rebuild PBVH in depsgraph. */
-- 
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