Refactor CDData masks, to have one mask per mesh elem type.

We already have different storages for cddata of verts, edges etc.,
'simply' do the same for the mask flags we use all around Blender code
to request some data, or limit some operation to some layers, etc.

Reason we need this is that some cddata types (like Normals) are
actually shared between verts/polys/loops, and we don’t want to generate
clnors everytime we request vnors!

As a side note, this also does final fix to T59338, which was the
trigger for this patch (need to request computed loop normals for
another mesh than evaluated one).

Reviewers: brecht, campbellbarton, sergey

Differential Revision: https://developer.blender.org/D4407

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_particle.h b/source/blender/blenkernel/BKE_particle.h
index 715d8670071..19036e63a8c 100644
--- a/source/blender/blenkernel/BKE_particle.h
+++ b/source/blender/blenkernel/BKE_particle.h
@@ -41,6 +41,7 @@ struct ParticleSystemModifierData;
 
 struct BVHTreeRay;
 struct BVHTreeRayHit;
+struct CustomData_MeshMasks;
 struct Depsgraph;
 struct Depsgraph;
 struct EdgeHash;
@@ -333,7 +334,7 @@ void psys_interpolate_mcol(const struct MCol *mcol, int quad, const float w[4],
 
 void copy_particle_key(struct ParticleKey *to, struct ParticleKey *from, int time);
 
-CustomDataMask psys_emitter_customdata_mask(struct ParticleSystem *psys);
+void psys_emitter_customdata_mask(struct ParticleSystem *psys, struct CustomData_MeshMasks *r_cddata_masks);
 void psys_particle_on_emitter(struct ParticleSystemModifierData *psmd, int distr, int index, int index_dmcache,
                               float fuv[4], float foffset, float vec[3], float nor[3],
                               float utan[3], float vtan[3], float orco[3]);