Modifiers: ported Bevel modifier DerivedMesh → Mesh

This introduces `BKE_mesh_to_bmesh_ex()`, which exposes all of the
`BMeshFromMeshParams` parameters to the caller. This is required to enable
the `calc_face_normal` flag, which is required for the Bevel modifier.

This also introduces `BKE_bmesh_to_mesh()`, which allocates a new `Mesh`,
converts the `BMesh` to it, and returns it. The returned mesh is owned by
the caller.

source/blender/blenkernel/BKE_mesh.h

@@ -33,6 +33,8 @@
 
 struct ID;
 struct BMeshCreateParams;
+struct BMeshFromMeshParams;
+struct BMeshToMeshParams;
 struct BoundBox;
 struct Depsgraph;
 struct EdgeHash;
@@ -71,10 +73,16 @@ extern "C" {
 
 /* *** mesh.c *** */
 
+struct BMesh *BKE_mesh_to_bmesh_ex(
+        struct Mesh *me,
+        const struct BMeshCreateParams *create_params,
+        const struct BMeshFromMeshParams *convert_params);
 struct BMesh *BKE_mesh_to_bmesh(
         struct Mesh *me, struct Object *ob,
         const bool add_key_index, const struct BMeshCreateParams *params);
 
+struct Mesh *BKE_bmesh_to_mesh(struct BMesh *me, const struct BMeshToMeshParams *params);
+
 int poly_find_loop_from_vert(
         const struct MPoly *poly,
         const struct MLoop *loopstart, unsigned vert);

source/blender/blenkernel/intern/mesh.c

@@ -666,23 +666,41 @@ Mesh *BKE_mesh_copy(Main *bmain, const Mesh *me)
 	return me_copy;
 }
 
-BMesh *BKE_mesh_to_bmesh(
-        Mesh *me, Object *ob,
-        const bool add_key_index, const struct BMeshCreateParams *params)
+BMesh *BKE_mesh_to_bmesh_ex(
+        Mesh *me,
+        const struct BMeshCreateParams *create_params,
+        const struct BMeshFromMeshParams *convert_params)
 {
 	BMesh *bm;
 	const BMAllocTemplate allocsize = BMALLOC_TEMPLATE_FROM_ME(me);
 
-	bm = BM_mesh_create(&allocsize, params);
-
-	BM_mesh_bm_from_me(
-	        bm, me, (&(struct BMeshFromMeshParams){
-	            .add_key_index = add_key_index, .use_shapekey = true, .active_shapekey = ob->shapenr,
-	        }));
+	bm = BM_mesh_create(&allocsize, create_params);
+	BM_mesh_bm_from_me(bm, me, convert_params);
 
 	return bm;
 }
 
+BMesh *BKE_mesh_to_bmesh(
+        Mesh *me, Object *ob,
+        const bool add_key_index, const struct BMeshCreateParams *params)
+{
+	struct BMeshFromMeshParams convert_params = {
+		.calc_face_normal = false,
+		.add_key_index = add_key_index,
+		.use_shapekey = true,
+		.active_shapekey = ob->shapenr,
+	};
+	return BKE_mesh_to_bmesh_ex(me, params, &convert_params);
+}
+
+Mesh *BKE_bmesh_to_mesh(BMesh *bm, const struct BMeshToMeshParams *params)
+{
+	Mesh *mesh = BKE_libblock_alloc_notest(ID_ME);
+	BKE_mesh_init(mesh);
+	BM_mesh_bm_to_me(bm, mesh, params);
+	return mesh;
+}
+
 void BKE_mesh_make_local(Main *bmain, Mesh *me, const bool lib_local)
 {
 	BKE_id_make_local_generic(bmain, &me->id, true, lib_local);

source/blender/modifiers/intern/MOD_armature.c

@@ -136,12 +136,9 @@ static void deformVertsEM(
 	ArmatureModifierData *amd = (ArmatureModifierData *) md;
 	Mesh *mesh_src = mesh;
 
-	/* TODO(sybren): possibly lift this code to modifier.c and use it for all modifiers */
 	if (!mesh) {
 		struct BMeshToMeshParams params = {0};
-		mesh_src = BKE_libblock_alloc_notest(ID_ME);
-		BKE_mesh_init(mesh_src);
-		BM_mesh_bm_to_me(em->bm, mesh_src, &params);
+		mesh_src = BKE_bmesh_to_mesh(em->bm, &params);
 	}
 
 	modifier_vgroup_cache(md, vertexCos); /* if next modifier needs original vertices */
@@ -169,12 +166,9 @@ static void deformMatricesEM(
 	ArmatureModifierData *amd = (ArmatureModifierData *) md;
 	Mesh *mesh_src = mesh;
 
-	/* TODO(sybren): possibly lift this code to modifier.c and use it for all modifiers */
 	if (!mesh) {
 		struct BMeshToMeshParams params = {0};
-		mesh_src = BKE_libblock_alloc_notest(ID_ME);
-		BKE_mesh_init(mesh_src);
-		BM_mesh_bm_to_me(em->bm, mesh_src, &params);
+		mesh_src = BKE_bmesh_to_mesh(em->bm, &params);
 	}
 
 	armature_deform_verts(amd->object, ctx->object, mesh_src, vertexCos, defMats, numVerts,

source/blender/modifiers/intern/MOD_bevel.c

@@ -33,6 +33,7 @@
  */
  
 #include "DNA_object_types.h"
+#include "DNA_mesh_types.h"
 
 #include "BLI_utildefines.h"
 #include "BLI_math.h"
@@ -40,6 +41,7 @@
 
 #include "BKE_cdderivedmesh.h"
 #include "BKE_deform.h"
+#include "BKE_mesh.h"
 #include "BKE_modifier.h"
 
 #include "MOD_util.h"
@@ -86,10 +88,9 @@ static CustomDataMask requiredDataMask(Object *UNUSED(ob), ModifierData *md)
 /*
  * This calls the new bevel code (added since 2.64)
  */
-static DerivedMesh *applyModifier(ModifierData *md, const ModifierEvalContext *ctx,
-                                  DerivedMesh *dm)
+static Mesh *applyModifier(ModifierData *md, const ModifierEvalContext *ctx, Mesh *mesh)
 {
-	DerivedMesh *result;
+	Mesh *result;
 	BMesh *bm;
 	BMIter iter;
 	BMEdge *e;
@@ -105,9 +106,17 @@ static DerivedMesh *applyModifier(ModifierData *md, const ModifierEvalContext *c
 	const int mat = CLAMPIS(bmd->mat, -1, ctx->object->totcol - 1);
 	const bool loop_slide = (bmd->flags & MOD_BEVEL_EVEN_WIDTHS) == 0;
 
-	bm = DM_to_bmesh(dm, true);
+	const struct BMeshCreateParams bmcp = {0};
+	const struct BMeshFromMeshParams bmfmp = {
+		.calc_face_normal = true,
+		.add_key_index = false,
+		.use_shapekey = true,
+		.active_shapekey = ctx->object->shapenr,
+	};
+	bm = BKE_mesh_to_bmesh_ex(mesh, &bmcp, &bmfmp);
+
 	if ((bmd->lim_flags & MOD_BEVEL_VGROUP) && bmd->defgrp_name[0])
-		modifier_get_vgroup(ctx->object, dm, bmd->defgrp_name, &dvert, &vgroup);
+		modifier_get_vgroup_mesh(ctx->object, mesh, bmd->defgrp_name, &dvert, &vgroup);
 
 	if (vertex_only) {
 		BM_ITER_MESH (v, &iter, bm, BM_VERTS_OF_MESH) {
@@ -167,15 +176,14 @@ static DerivedMesh *applyModifier(ModifierData *md, const ModifierEvalContext *c
 	              vertex_only, bmd->lim_flags & MOD_BEVEL_WEIGHT, do_clamp,
 	              dvert, vgroup, mat, loop_slide);
 
-	result = CDDM_from_bmesh(bm, true);
+	struct BMeshToMeshParams bmmp = {0};
+	result = BKE_bmesh_to_mesh(bm, &bmmp);
 
 	BLI_assert(bm->vtoolflagpool == NULL &&
 	           bm->etoolflagpool == NULL &&
 	           bm->ftoolflagpool == NULL);  /* make sure we never alloc'd these */
 	BM_mesh_free(bm);
 
-	result->dirty |= DM_DIRTY_NORMALS;
-
 	return result;
 }
 
@@ -199,14 +207,14 @@ ModifierTypeInfo modifierType_Bevel = {
 	/* deformMatrices_DM */ NULL,
 	/* deformVertsEM_DM */  NULL,
 	/* deformMatricesEM_DM*/NULL,
-	/* applyModifier_DM */  applyModifier,
+	/* applyModifier_DM */  NULL,
 	/* applyModifierEM_DM */NULL,
 
 	/* deformVerts */       NULL,
 	/* deformMatrices */    NULL,
 	/* deformVertsEM */     NULL,
 	/* deformMatricesEM */  NULL,
-	/* applyModifier */     NULL,
+	/* applyModifier */     applyModifier,
 	/* applyModifierEM */   NULL,
 
 	/* initData */          initData,