Sculpt dyntopo:

Seperate enabling PBVH_BMESH from enabling DynTopo:

* Created a new option to globally disabled
  DynTopo.
* The DynTopo panel header now reads "Dynamic Mode",
  to hopefully signal that turning on PBVH_BMESH is
  a seperate step from enabling or disabling DynTopo
  itself.
* The first checkbox in the panel is "DynTopo" so it
  should be clear enough (it's on by default, with multiple
  layers of file versioning checks).

PBVH_BMesh's undo system:

* CD_MESH_ID layers are now permanently saved once
  they are created (by default they are not).  This
  fixed a *lot* of bugs:

  Before this the undo system had to save maps between
  mesh indices and mesh IDs on transitioning
  between sculpt and global undo steps.  This was
  extremely error prone, and it simply wasn't possible
  to cover all of the corner cases

* Note that there is still an odd bug where the first
  global undo push after a sculpt step gets ignored,
  I dunno what's up with this.

* Dyntopo undo should be nearly (hopefully completely)
  bug-free after this commit.

C++20

* Made a few small changes to get blender to compile
  with c++20.  std::result_of was removed, had to
  replace a couple of usages of it with std::invoke_result.

* I'm planning to do some design studies on rewriting
  sculpt into C++.

* I strongly suspect we are going to need C++20'a new
  concepts feature if we move sculpt into C++.
  I'm planning to do some design studies on how
  that might work.

1 files changed, 4 insertions, 2 deletions

diff --git a/release/scripts/startup/bl_ui/space_view3d_toolbar.py b/release/scripts/startup/bl_ui/space_view3d_toolbar.py
index 27920a9a57a..7f9918fd9b9 100644
--- a/release/scripts/startup/bl_ui/space_view3d_toolbar.py
+++ b/release/scripts/startup/bl_ui/space_view3d_toolbar.py
@@ -783,7 +783,7 @@ class VIEW3D_PT_sculpt_dyntopo_advanced(Panel, View3DPaintPanel):
         col.label(text="Local Brush Settings")
 
         row = col.row()
-        row.prop(brush.dyntopo, "disabled", text="Disable Dyntopo")
+        row.prop(brush.dyntopo, "disabled", text="Disable Dyntopo locally for this brush")
 
         col.label(text="Overrides")
         inherit_all = "ALL" in brush.dyntopo.inherit
@@ -825,7 +825,7 @@ class VIEW3D_PT_sculpt_dyntopo_advanced(Panel, View3DPaintPanel):
 # TODO, move to space_view3d.py
 class VIEW3D_PT_sculpt_dyntopo(Panel, View3DPaintPanel):
     bl_context = ".sculpt_mode"  # dot on purpose (access from topbar)
-    bl_label = "Dyntopo"
+    bl_label = "Dynamic Mode"
     bl_options = {'DEFAULT_CLOSED'}
     bl_ui_units_x = 12
 
@@ -857,6 +857,8 @@ class VIEW3D_PT_sculpt_dyntopo(Panel, View3DPaintPanel):
         col = layout.column()
         col.active = context.sculpt_object.use_dynamic_topology_sculpting
 
+        col.prop(sculpt, "use_dyntopo");
+
         sub = col.column()
         sub.active = (brush and brush.sculpt_tool != 'MASK')
         if sculpt.detail_type_method in {'CONSTANT', 'MANUAL'}: