Modifiers: Add wrapper functions with Mesh / DerivedMesh conversion

Makes the follow changes:

- Add new `deform*` and `apply*` function pointers to `ModifierTypeInfo` that take `Mesh`, and rename the old functions to indicate that they take `DerivedMesh`. These new functions are currently set to `NULL` for all modifiers.
- Add wrapper `modifier_deform*` and `modifier_apply*` functions in two variants: one that works with `Mesh` and the other which works with `DerivedMesh` that is named with `*_DM_depercated`. These functions check which type of data the modifier supports and converts if necessary
- Update the rest of Blender to be aware and make use of these new functions

The goal of these changes is to make it possible to port to using `Mesh` incrementally without ever needing to enter into a state where modifiers don't work. After everything has been ported over the old functions and wrappers could be removed.

Reviewers: campbellbarton, sergey, mont29

Subscribers: sybren

Tags: #bf_blender_2.8

Differential Revision: https://developer.blender.org/D3155

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/blenkernel/intern/lattice.c b/source/blender/blenkernel/intern/lattice.c
index b9e6e0e8fa9..570ad9c8980 100644
--- a/source/blender/blenkernel/intern/lattice.c
+++ b/source/blender/blenkernel/intern/lattice.c
@@ -1053,7 +1053,7 @@ void BKE_lattice_modifiers_calc(struct Depsgraph *depsgraph, Scene *scene, Objec
 		if (mti->type != eModifierTypeType_OnlyDeform) continue;
 
 		if (!vertexCos) vertexCos = BKE_lattice_vertexcos_get(ob, &numVerts);
-		mti->deformVerts(md, depsgraph, ob, NULL, vertexCos, numVerts, 0);
+		modifier_deformVerts_DM_deprecated(md, depsgraph, ob, NULL, vertexCos, numVerts, 0);
 	}
 
 	/* always displist to make this work like derivedmesh */