Multires: Support smooth shading when sculpting

On CCG side it is done similar to displacement, where we have
a dedicated functor which evaluates displacement. Might be seemed
as an overkill, but allows to decouple SubdivCCG from mesh entirely,
and maybe even free up coarse mesh in order to save some memory.

Some weak-looking aspect is the call to update normals from the
draw manager. Ideally, the manager will only draw what is already
evaluated. But it's a bit tricky to find a best place for this since
we avoid dependency graph updates during sculpt as much as possible.
The new code mimics the old code, this is how it was in 2.7.

Fix shading part of T58307.

1 files changed, 2 insertions, 3 deletions

diff --git a/source/blender/blenkernel/BKE_subdiv.h b/source/blender/blenkernel/BKE_subdiv.h
index 4fddb3d5188..1ade8a0e44d 100644
--- a/source/blender/blenkernel/BKE_subdiv.h
+++ b/source/blender/blenkernel/BKE_subdiv.h
@@ -145,8 +145,7 @@ typedef struct SubdivDisplacement {
 typedef struct Subdiv {
 	/* Settings this subdivision surface is created for.
 	 *
-	 * It is read-only after assignment in BKE_subdiv_new_from_FOO().
-	 */
+	 * It is read-only after assignment in BKE_subdiv_new_from_FOO(). */
 	SubdivSettings settings;
 	/* Topology refiner includes all the glue logic to feed Blender side
 	 * topology to OpenSubdiv. It can be shared by both evaluator and GL mesh
@@ -162,7 +161,7 @@ typedef struct Subdiv {
 	/* Cached values, are not supposed to be accessed directly. */
 	struct {
 		/* Indexed by base face index, element indicates total number of ptex
-		 *faces created for preceding base faces. */
+		 * faces created for preceding base faces. */
 		int *face_ptex_offset;
 	} cache_;
 } Subdiv;