1 files changed, 30 insertions, 0 deletions
diff --git a/source/blender/makesdna/DNA_anim_types.h b/source/blender/makesdna/DNA_anim_types.h
index 1718aabc51d..70add4c156f 100644
--- a/source/blender/makesdna/DNA_anim_types.h
+++ b/source/blender/makesdna/DNA_anim_types.h
@@ -319,6 +319,10 @@ typedef struct DriverTarget {
   /** Transform channel index (for DVAR_TYPE_TRANSFORM_CHAN.)*/
   short transChan;
 
+  /** Rotation channel calculation type. */
+  char rotation_mode;
+  char _pad[7];
+
   /**
    * Flags for the validity of the target
    * (NOTE: these get reset every time the types change).
@@ -358,10 +362,36 @@ typedef enum eDriverTarget_TransformChannels {
   DTAR_TRANSCHAN_SCALEY,
   DTAR_TRANSCHAN_SCALEZ,
   DTAR_TRANSCHAN_SCALE_AVG,
+  DTAR_TRANSCHAN_ROTW,
 
   MAX_DTAR_TRANSCHAN_TYPES,
 } eDriverTarget_TransformChannels;
 
+/* Rotation channel mode for Driver Targets */
+typedef enum eDriverTarget_RotationMode {
+  /** Automatic euler mode. */
+  DTAR_ROTMODE_AUTO = 0,
+
+  /** Explicit euler rotation modes - must sync with BLI_math_rotation.h defines. */
+  DTAR_ROTMODE_EULER_XYZ = 1,
+  DTAR_ROTMODE_EULER_XZY,
+  DTAR_ROTMODE_EULER_YXZ,
+  DTAR_ROTMODE_EULER_YZX,
+  DTAR_ROTMODE_EULER_ZXY,
+  DTAR_ROTMODE_EULER_ZYX,
+
+  DTAR_ROTMODE_QUATERNION,
+
+  /** Implements the very common Damped Track + child trick to decompose
+   *  rotation into bending followed by twist around the remaining axis. */
+  DTAR_ROTMODE_SWING_TWIST_X,
+  DTAR_ROTMODE_SWING_TWIST_Y,
+  DTAR_ROTMODE_SWING_TWIST_Z,
+
+  DTAR_ROTMODE_EULER_MIN = DTAR_ROTMODE_EULER_XYZ,
+  DTAR_ROTMODE_EULER_MAX = DTAR_ROTMODE_EULER_ZYX,
+} eDriverTarget_RotationMode;
+
 /* --- */
 
 /* maximum number of driver targets per variable */