Curves: Further implementation of new curves data structure

The general idea here is to wrap the `CurvesGeometry` DNA struct
with a C++ class that can do most of the heavy lifting for the curve
geometry. Using a C++ class allows easier ways to group methods, easier
const correctness, and code that's more readable and faster to write.
This way, it works much more like a version of `CurveEval` that uses
more efficient attribute storage.

This commit adds the structure of some yet-to-be-implemented code,
the largest thing being mutexes and vectors meant to hold lazily
calculated evaluated positions, tangents, and normals. That part might
change slightly, but it's helpful to be able to see the direction this
commit is aiming in. In particular, the inherently single-threaded
accumulated lengths and Bezier evaluated point offsets might be cached.

Ref T95355

Differential Revision: https://developer.blender.org/D14054

1 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/draw/intern/draw_cache_impl_curves.cc b/source/blender/draw/intern/draw_cache_impl_curves.cc
index a779c694cd2..2153b674463 100644
--- a/source/blender/draw/intern/draw_cache_impl_curves.cc
+++ b/source/blender/draw/intern/draw_cache_impl_curves.cc
@@ -22,7 +22,7 @@
 #include "DNA_curves_types.h"
 #include "DNA_object_types.h"
 
-#include "BKE_curves.h"
+#include "BKE_curves.hh"
 
 #include "GPU_batch.h"
 #include "GPU_material.h"
@@ -133,7 +133,7 @@ static void curves_batch_cache_fill_segments_proc_pos(Curves *curves,
 {
   /* TODO: use hair radius layer if available. */
   const int curve_size = curves->geometry.curve_size;
-  Span<int> offsets{curves->geometry.offsets, curves->geometry.curve_size + 1};
+  Span<int> offsets{curves->geometry.curve_offsets, curves->geometry.curve_size + 1};
 
   Span<float3> positions{(float3 *)curves->geometry.position, curves->geometry.point_size};
 
@@ -216,7 +216,7 @@ static void curves_batch_cache_fill_strands_data(Curves *curves,
                                                  GPUVertBufRaw *seg_step)
 {
   const int curve_size = curves->geometry.curve_size;
-  Span<int> offsets{curves->geometry.offsets, curves->geometry.curve_size + 1};
+  Span<int> offsets{curves->geometry.curve_offsets, curves->geometry.curve_size + 1};
 
   for (const int i : IndexRange(curve_size)) {
     const IndexRange curve_range(offsets[i], offsets[i + 1] - offsets[i]);