1 files changed, 26 insertions, 7 deletions

diff --git a/gfx/include/gfx/scene/animation.h b/gfx/include/gfx/scene/animation.h
index 42c0c43..d95b895 100644
--- a/gfx/include/gfx/scene/animation.h
+++ b/gfx/include/gfx/scene/animation.h
@@ -5,6 +5,7 @@
 #include <gfx/sizes.h>
 
 #include <cstring.h>
+#include <math/aabb3.h>
 #include <math/defs.h>
 #include <math/mat4.h>
 #include <math/quat.h>
@@ -22,21 +23,26 @@ typedef struct Joint    Joint;
 typedef struct Skeleton Skeleton;
 
 /// Index type used to store relative indices into arrays.
-typedef uint16_t rel_idx;
+typedef uint16_t joint_idx;
 
 /// Index value denoting no index.
-static const rel_idx INDEX_NONE = (rel_idx)-1;
+static const joint_idx INDEX_NONE = (joint_idx)-1;
+
+typedef struct Box {
+  vec3 vertices[8];
+} Box;
 
 /// Joint descriptor.
 typedef struct JointDesc {
-  rel_idx parent;          /// Parent Joint; index into Anima's joints.
-  mat4    inv_bind_matrix; /// Transforms the mesh into the joint's local space.
+  joint_idx parent;      /// Parent Joint; index into Anima's joints.
+  mat4  inv_bind_matrix; /// Transforms the mesh into the joint's local space.
+  aabb3 box;             /// Bounding box.
 } JointDesc;
 
 /// Skeleton descriptor.
 typedef struct SkeletonDesc {
-  size_t  num_joints;
-  rel_idx joints[GFX_MAX_NUM_JOINTS]; /// Indices into Anima's joints array.
+  size_t    num_joints;
+  joint_idx joints[GFX_MAX_NUM_JOINTS]; /// Indices into Anima's joints array.
 } SkeletonDesc;
 
 /// Animation interpolation mode.
@@ -67,7 +73,7 @@ typedef struct KeyframeDesc {
 
 /// Animation channel descriptor.
 typedef struct ChannelDesc {
-  rel_idx                target; /// Index into Anima's joints array.
+  joint_idx              target; /// Index into Anima's joints array.
   ChannelType            type;
   AnimationInterpolation interpolation;
   size_t                 num_keyframes;
@@ -121,3 +127,16 @@ void gfx_stop_animation(Anima*);
 
 /// Return the anima's ith skeleton.
 const Skeleton* gfx_get_anima_skeleton(const Anima* anima, size_t i);
+
+/// Return the number of joints in the skeleton.
+size_t gfx_get_skeleton_num_joints(const Skeleton*);
+
+/// Return true if the skeleton's ith joint has a bounding box.
+///
+/// IK joints that do not directly transform vertices have no bounding box.
+bool gfx_joint_has_box(const Anima*, const Skeleton*, size_t joint);
+
+/// Return the bounding box of the skeleton's ith joint.
+///
+/// IK joints that do not directly transform vertices have no box.
+Box gfx_get_joint_box(const Anima*, const Skeleton*, size_t joint);