Cleanup: More proper sections in subdiv code

Follows the code style.

source/blender/blenkernel/BKE_subdiv.h

@@ -186,13 +186,17 @@ typedef struct Subdiv {
   } cache_;
 } Subdiv;
 
-/* =================----====--===== MODULE ==========================------== */
+/* --------------------------------------------------------------------
+ * Module.
+ */
 
 /* (De)initialize the entire subdivision surface module. */
 void BKE_subdiv_init(void);
 void BKE_subdiv_exit(void);
 
-/* ========================== CONVERSION HELPERS ============================ */
+/* --------------------------------------------------------------------
+ * Conversion helpers.
+ */
 
 /* NOTE: uv_smooth is eSubsurfUVSmooth. */
 eSubdivFVarLinearInterpolation BKE_subdiv_fvar_interpolation_from_uv_smooth(int uv_smooth);
@@ -200,7 +204,9 @@ eSubdivFVarLinearInterpolation BKE_subdiv_fvar_interpolation_from_uv_smooth(int
 eSubdivVtxBoundaryInterpolation BKE_subdiv_vtx_boundary_interpolation_from_subsurf(
     int boundary_smooth);
 
-/* =============================== STATISTICS =============================== */
+/* --------------------------------------------------------------------
+ * Statistics.
+ */
 
 void BKE_subdiv_stats_init(SubdivStats *stats);
 
@@ -211,11 +217,15 @@ void BKE_subdiv_stats_reset(SubdivStats *stats, eSubdivStatsValue value);
 
 void BKE_subdiv_stats_print(const SubdivStats *stats);
 
-/* ================================ SETTINGS ================================ */
+/* --------------------------------------------------------------------
+ * Settings.
+ */
 
 bool BKE_subdiv_settings_equal(const SubdivSettings *settings_a, const SubdivSettings *settings_b);
 
-/* ============================== CONSTRUCTION ============================== */
+/* --------------------------------------------------------------------
+ * Construction.
+ */
 
 /* Construct new subdivision surface descriptor, from scratch, using given
  * settings and topology. */
@@ -240,7 +250,9 @@ Subdiv *BKE_subdiv_update_from_mesh(Subdiv *subdiv,
 
 void BKE_subdiv_free(Subdiv *subdiv);
 
-/* ============================ DISPLACEMENT API ============================ */
+/* --------------------------------------------------------------------
+ * Displacemnt API.
+ */
 
 void BKE_subdiv_displacement_attach_from_multires(Subdiv *subdiv,
                                                   struct Mesh *mesh,
@@ -248,14 +260,18 @@ void BKE_subdiv_displacement_attach_from_multires(Subdiv *subdiv,
 
 void BKE_subdiv_displacement_detach(Subdiv *subdiv);
 
-/* ============================ TOPOLOGY HELPERS ============================ */
+/* --------------------------------------------------------------------
+ * Topology helpers.
+ */
 
 /* For each element in the array, this stores the total number of ptex faces up to that element,
  * with the total number of ptex faces being the last element in the array. The array is of length
  * `base face count + 1`. */
 int *BKE_subdiv_face_ptex_offset_get(Subdiv *subdiv);
 
-/* =========================== PTEX FACES AND GRIDS ========================= */
+/* --------------------------------------------------------------------
+ * PTex faces and grids.
+ */
 
 /* For a given (ptex_u, ptex_v) within a ptex face get corresponding
  * (grid_u, grid_v) within a grid. */

source/blender/blenkernel/intern/subdiv.c

@@ -25,7 +25,9 @@
 #include "opensubdiv_evaluator_capi.h"
 #include "opensubdiv_topology_refiner_capi.h"
 
-/* =================----====--===== MODULE ==========================------== */
+/* --------------------------------------------------------------------
+ * Module.
+ */
 
 void BKE_subdiv_init()
 {
@@ -37,7 +39,9 @@ void BKE_subdiv_exit()
   openSubdiv_cleanup();
 }
 
-/* ========================== CONVERSION HELPERS ============================ */
+/* --------------------------------------------------------------------
+ * Conversion helpers.
+ */
 
 eSubdivFVarLinearInterpolation BKE_subdiv_fvar_interpolation_from_uv_smooth(int uv_smooth)
 {
@@ -72,7 +76,9 @@ eSubdivVtxBoundaryInterpolation BKE_subdiv_vtx_boundary_interpolation_from_subsu
   return SUBDIV_VTX_BOUNDARY_EDGE_ONLY;
 }
 
-/* ================================ SETTINGS ================================ */
+/* --------------------------------------------------------------------
+ * Settings.
+ */
 
 bool BKE_subdiv_settings_equal(const SubdivSettings *settings_a, const SubdivSettings *settings_b)
 {
@@ -83,7 +89,9 @@ bool BKE_subdiv_settings_equal(const SubdivSettings *settings_a, const SubdivSet
           settings_a->fvar_linear_interpolation == settings_b->fvar_linear_interpolation);
 }
 
-/* ============================== CONSTRUCTION ============================== */
+/* --------------------------------------------------------------------
+ * Construction.
+ */
 
 /* Creation from scratch. */
 
@@ -194,7 +202,9 @@ void BKE_subdiv_free(Subdiv *subdiv)
   MEM_freeN(subdiv);
 }
 
-/* =========================== PTEX FACES AND GRIDS ========================= */
+/* --------------------------------------------------------------------
+ * Topology helpers.
+ */
 
 int *BKE_subdiv_face_ptex_offset_get(Subdiv *subdiv)
 {

source/blender/blenkernel/intern/subdiv_eval.c

@@ -23,7 +23,9 @@
 #include "opensubdiv_evaluator_capi.h"
 #include "opensubdiv_topology_refiner_capi.h"
 
-/* ============================  Helper Function ============================ */
+/* --------------------------------------------------------------------
+ * Helper functions.
+ */
 
 static eOpenSubdivEvaluator opensubdiv_evalutor_from_subdiv_evaluator_type(
     eSubdivEvaluatorType evaluator_type)
@@ -40,7 +42,9 @@ static eOpenSubdivEvaluator opensubdiv_evalutor_from_subdiv_evaluator_type(
   return OPENSUBDIV_EVALUATOR_CPU;
 }
 
-/* ======================  Main Subdivision Evaluation ====================== */
+/* --------------------------------------------------------------------
+ * Main subdivision evaluation.
+ */
 
 bool BKE_subdiv_eval_begin(Subdiv *subdiv,
                            eSubdivEvaluatorType evaluator_type,
@@ -226,7 +230,9 @@ void BKE_subdiv_eval_init_displacement(Subdiv *subdiv)
   subdiv->displacement_evaluator->initialize(subdiv->displacement_evaluator);
 }
 
-/* ========================== Single point queries ========================== */
+/* --------------------------------------------------------------------
+ * Single point queries.
+ */
 
 void BKE_subdiv_eval_limit_point(
     Subdiv *subdiv, const int ptex_face_index, const float u, const float v, float r_P[3])