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Mesh: Move edge UV seams to a generic attribute

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As part of #95966, move the `ME_SEAM` flag on mesh edges
to a generic boolean attribute, called `.uv_seam`. This is the
last bit of extra information stored in mesh edges. After this
is committed we can switch to a different type for them and
have a 1/3 improvement in memory consumption.

It is also now possible to see that a mesh has no UV seams in
constant time, and like other similar refactors, interacting with
only the UV seams can be done with less memory.

The attribute name starts with a `.` to signify that the attribute,
like face sets, isn't meant to be used in arbitrary procedural
situations (with geometry nodes for example). That gives us more
freedom to change things in the future.

Pull Request #104728
This commit is contained in:
Hans Goudey
2023-03-01 14:13:05 +01:00
committed by Hans Goudey
parent 66c9c19466
commit cccf91ff83
24 changed files with 212 additions and 156 deletions
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5
source/blender/modifiers/intern/MOD_screw.cc
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@@ -449,7 +449,6 @@ static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *ctx, Mesh *
for (uint i = 0; i < totedge; i++, med_orig++, med_new++) {
med_new->v1 = med_orig->v1;
med_new->v2 = med_orig->v2;
med_new->flag = med_orig->flag;
}
/* build polygon -> edge map */
@@ -801,7 +800,6 @@ static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *ctx, Mesh *
/* add the new edge */
med_new->v1 = varray_stride + j;
med_new->v2 = med_new->v1 - totvert;
med_new->flag = 0;
med_new++;
}
}
@@ -819,7 +817,6 @@ static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *ctx, Mesh *
for (uint i = 0; i < totvert; i++) {
med_new->v1 = i;
med_new->v2 = varray_stride + i;
med_new->flag = 0;
med_new++;
}
}
@@ -948,7 +945,6 @@ static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *ctx, Mesh *
if (step) { /* The first set is already done */
med_new->v1 = i1;
med_new->v2 = i2;
med_new->flag = med_new_firstloop->flag;
med_new++;
}
i1 += totvert;
@@ -975,7 +971,6 @@ static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *ctx, Mesh *
/* new vertical edge */
med_new->v1 = i1;
med_new->v2 = i2;
med_new->flag = med_new_firstloop->flag;
med_new++;
}