diff options
Diffstat (limited to 'source/blender/blenkernel/BKE_curves.hh')
| -rw-r--r-- | source/blender/blenkernel/BKE_curves.hh | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/source/blender/blenkernel/BKE_curves.hh b/source/blender/blenkernel/BKE_curves.hh index 82f77d83bec..05a20917552 100644 --- a/source/blender/blenkernel/BKE_curves.hh +++ b/source/blender/blenkernel/BKE_curves.hh @@ -77,6 +77,15 @@ class CurvesGeometryRuntime { mutable std::mutex position_cache_mutex; mutable bool position_cache_dirty = true; + /** + * Cache of lengths along each evaluated curve for for each evaluated point. If a curve is + * cyclic, it needs one more length value to correspond to the last segment, so in order to + * make slicing this array for a curve fast, an extra float is stored for every curve. + */ + mutable Vector<float> evaluated_length_cache; + mutable std::mutex length_cache_mutex; + mutable bool length_cache_dirty = true; + /** Direction of the spline at each evaluated point. */ mutable Vector<float3> evaluated_tangents_cache; mutable std::mutex tangent_cache_mutex; @@ -267,6 +276,20 @@ class CurvesGeometry : public ::CurvesGeometry { Span<float3> evaluated_positions() const; /** + * Return a cache of accumulated lengths along the curve. Each item is the length of the + * subsequent segment (the first value is the length of the first segment rather than 0). + * This calculation is rather trivial, and only depends on the evaluated positions, but + * the results are used often, and it is necessarily single threaded per curve, so it is cached. + * + * \param cyclic: This argument is redundant with the data stored for the curve, + * but is passed for performance reasons to avoid looking up the attribute. + */ + Span<float> evaluated_lengths_for_curve(int curve_index, bool cyclic) const; + + /** Calculates the data described by #evaluated_lengths_for_curve if necessary. */ + void ensure_evaluated_lengths() const; + + /** * Evaluate a generic data to the standard evaluated points of a specific curve, * defined by the resolution attribute or other factors, depending on the curve type. * @@ -281,6 +304,9 @@ class CurvesGeometry : public ::CurvesGeometry { */ void ensure_nurbs_basis_cache() const; + /** Return the slice of #evaluated_length_cache that corresponds to this curve index. */ + IndexRange lengths_range_for_curve(int curve_index, bool cyclic) const; + /* -------------------------------------------------------------------- * Operations. */ |