1 files changed, 132 insertions, 0 deletions
diff --git a/source/blender/makesdna/DNA_curves_types.h b/source/blender/makesdna/DNA_curves_types.h
new file mode 100644
index 00000000000..c45de832e3c
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+++ b/source/blender/makesdna/DNA_curves_types.h
@@ -0,0 +1,132 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup DNA
+ */
+
+#pragma once
+
+#include "DNA_ID.h"
+#include "DNA_customdata_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+namespace blender::bke {
+class CurvesGeometryRuntime;
+}  // namespace blender::bke
+using CurvesGeometryRuntimeHandle = blender::bke::CurvesGeometryRuntime;
+#else
+typedef struct CurvesGeometryRuntimeHandle CurvesGeometryRuntimeHandle;
+#endif
+
+typedef enum CurveType {
+  CURVE_TYPE_CATMULL_ROM = 0,
+  CURVE_TYPE_POLY = 1,
+  CURVE_TYPE_BEZIER = 2,
+  CURVE_TYPE_NURBS = 3,
+} CurveType;
+
+typedef enum HandleType {
+  /** The handle can be moved anywhere, and doesn't influence the point's other handle. */
+  BEZIER_HANDLE_FREE = 0,
+  /** The location is automatically calculated to be smooth. */
+  BEZIER_HANDLE_AUTO = 1,
+  /** The location is calculated to point to the next/previous control point. */
+  BEZIER_HANDLE_VECTOR = 2,
+  /** The location is constrained to point in the opposite direction as the other handle. */
+  BEZIER_HANDLE_ALIGN = 3,
+} HandleType;
+
+/**
+ * A reusable data structure for geometry consisting of many curves. All control point data is
+ * stored contiguously for better efficiency. Data for each curve is stored as a slice of the
+ * main #point_data array.
+ *
+ * The data structure is meant to be embedded in other data-blocks to allow reusing
+ * curve-processing algorithms for multiple Blender data-block types.
+ */
+typedef struct CurvesGeometry {
+  /**
+   * A runtime pointer to the "position" attribute data.
+   * \note This data is owned by #point_data.
+   */
+  float (*position)[3];
+  /**
+   * A runtime pointer to the "radius" attribute data.
+   * \note This data is owned by #point_data.
+   */
+  float *radius;
+
+  /**
+   * The type of each curve. #CurveType.
+   * \note This data is owned by #curve_data.
+   */
+  int8_t *curve_type;
+
+  /**
+   * The start index of each curve in the point data. The size of each curve can be calculated by
+   * subtracting the offset from the next offset. That is valid even for the last curve because
+   * this array is allocated with a length one larger than the number of splines.
+   *
+   * \note This is *not* stored in #CustomData because its size is one larger than #curve_data.
+   */
+  int *curve_offsets;
+
+  /**
+   * All attributes stored on control points (#ATTR_DOMAIN_POINT).
+   */
+  CustomData point_data;
+
+  /**
+   * All attributes stored on curves (#ATTR_DOMAIN_CURVE).
+   */
+  CustomData curve_data;
+
+  /**
+   * The total number of control points in all curves.
+   */
+  int point_size;
+  /**
+   * The number of curves in the data-block.
+   */
+  int curve_size;
+
+  /**
+   * Runtime data for curves, stored as a pointer to allow defining this as a C++ class.
+   */
+  CurvesGeometryRuntimeHandle *runtime;
+} CurvesGeometry;
+
+typedef struct Curves {
+  ID id;
+  /* Animation data (must be immediately after id). */
+  struct AnimData *adt;
+
+  CurvesGeometry geometry;
+
+  int flag;
+  int attributes_active_index;
+
+  /* Materials. */
+  struct Material **mat;
+  short totcol;
+  short _pad2[3];
+
+  /* Draw Cache. */
+  void *batch_cache;
+} Curves;
+
+/* Curves.flag */
+enum {
+  HA_DS_EXPAND = (1 << 0),
+};
+
+/* Only one material supported currently. */
+#define CURVES_MATERIAL_NR 1
+
+#ifdef __cplusplus
+}
+#endif