1 files changed, 72 insertions, 0 deletions
diff --git a/src/animation.h b/src/animation.h
new file mode 100644
index 0000000..5462e65
--- /dev/null
+++ b/src/animation.h
@@ -0,0 +1,72 @@
+#pragma once
+
+#include "darray.h"
+#include "defines.h"
+#include "maths_types.h"
+
+KITC_DECL_TYPED_ARRAY(f32)
+
+typedef enum interpolation { INTERPOLATION_LINEAR, INTERPOLATION_COUNT } interpolation;
+
+typedef enum keyframe_kind {
+  KEYFRAME_ROTATION,
+  KEYFRAME_TRANSLATION,
+  KEYFRAME_SCALE,
+  KEYFRAME_WEIGHTS,
+} keyframe_kind;
+
+typedef union keyframe {
+  quat rotation;
+  vec3 translation;
+  vec3 scale;
+  float* weights;
+} keyframe;
+
+typedef struct keyframes {
+  keyframe_kind kind;
+  keyframe* values;
+  size_t count;
+} keyframes;
+
+typedef struct joint {
+  char* name;  // optional
+  transform transform_components;
+  mat4 inverse_bind_matrix;
+  mat4 local_transform;
+} joint;
+
+typedef struct animation_spline {
+  f32* timestamps;
+  size_t n_timestamps;
+  keyframes values;
+  interpolation interpolation;
+} animation_spline;
+
+typedef struct animation_sampler {
+  int current_index;
+  f32 min;
+  f32 max;
+  animation_spline animation;
+} animation_sampler;
+
+/** @brief Sample an animation at a given time `t` */
+keyframe animation_sample(animation_sampler* sampler, f32 t);
+
+typedef struct animation_clip {
+  // A clip contains one or more animation curves
+  // for now I think we can just enumerate all of the properties (assuming *only* one per type is in
+  // a clip) NULL = this property is not animated in this clip
+  animation_sampler* rotation;
+  animation_sampler* translation;
+  animation_sampler* scale;
+  animation_sampler* weights;
+} animation_clip;
+
+typedef struct skinned_animation {
+  mat4* joint_matrices;
+  size_t n_joints;
+} skinned_animation;
+
+// void animation_update_joint_matrices(animation_clip* )
+
+void animation_play(animation_clip* clip);
+\ No newline at end of file