Curves: Rename "Hair" types, variables, and functions to "Curves"

Based on discussions from T95355 and T94193, the plan is to use
the name "Curves" to describe the data-block container for multiple
curves. Eventually this will replace the existing "Curve" data-block.
However, it will be a while before the curve data-block can be replaced
so in order to distinguish the two curve types in the UI, "Hair Curves"
will be used, but eventually changed back to "Curves".

This patch renames "hair-related" files, functions, types, and variable
names to this convention. A deep rename is preferred to keep code
consistent and to avoid any "hair" terminology from leaking, since the
new data-block is meant for all curve types, not just hair use cases.

The downside of this naming is that the difference between "Curve"
and "Curves" has become important. That was considered during
design discussons and deemed acceptable, especially given the
non-permanent nature of the somewhat common conflict.

Some points of interest:
- All DNA compatibility is lost, just like rBf59767ff9729.
- I renamed `ID_HA` to `ID_CV` so there is no complete mismatch.
- `hair_curves` is used where necessary to distinguish from the
  existing "curves" plural.
- I didn't rename any of the cycles/rendering code function names,
  since that is also used by the old hair particle system.

Differential Revision: https://developer.blender.org/D14007

1 files changed, 68 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_curves.h b/source/blender/blenkernel/BKE_curves.h
new file mode 100644
index 00000000000..99839b20121
--- /dev/null
+++ b/source/blender/blenkernel/BKE_curves.h
@@ -0,0 +1,68 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+/** \file
+ * \ingroup bke
+ * \brief Low-level operations for curves.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct BoundBox;
+struct CustomDataLayer;
+struct Depsgraph;
+struct Curves;
+struct Main;
+struct Object;
+struct Scene;
+
+void *BKE_curves_add(struct Main *bmain, const char *name);
+
+struct BoundBox *BKE_curves_boundbox_get(struct Object *ob);
+
+void BKE_curves_update_customdata_pointers(struct Curves *curves);
+bool BKE_curves_customdata_required(struct Curves *curves, struct CustomDataLayer *layer);
+
+/* Depsgraph */
+
+struct Curves *BKE_curves_new_for_eval(const struct Curves *curves_src,
+                                       int totpoint,
+                                       int totcurve);
+struct Curves *BKE_curves_copy_for_eval(struct Curves *curves_src, bool reference);
+
+void BKE_curves_data_update(struct Depsgraph *depsgraph,
+                            struct Scene *scene,
+                            struct Object *object);
+
+/* Draw Cache */
+
+enum {
+  BKE_CURVES_BATCH_DIRTY_ALL = 0,
+};
+
+void BKE_curves_batch_cache_dirty_tag(struct Curves *curves, int mode);
+void BKE_curves_batch_cache_free(struct Curves *curves);
+
+extern void (*BKE_curves_batch_cache_dirty_tag_cb)(struct Curves *curves, int mode);
+extern void (*BKE_curves_batch_cache_free_cb)(struct Curves *curves);
+
+#ifdef __cplusplus
+}
+#endif