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#pragma once
#include "darray.h"
#include "defines.h"
#include "maths_types.h"
#include "mem.h"
typedef enum Interpolation {
INTERPOLATION_STEP,
INTERPOLATION_LINEAR,
INTERPOLATION_CUBIC, /** @brief Cubic spline interpolation */
INTERPOLATION_COUNT
} Interpolation;
typedef enum KeyframeKind {
KEYFRAME_ROTATION,
KEYFRAME_TRANSLATION,
KEYFRAME_SCALE,
KEYFRAME_WEIGHTS,
} KeyframeKind;
typedef union Keyframe {
Quat rotation;
Vec3 translation;
Vec3 scale;
f32 weights[4];
} Keyframe;
typedef struct Keyframes {
KeyframeKind kind;
Keyframe* values;
size_t count;
} Keyframes;
typedef struct Joint {
char* debug_label; // optional
Mat4 inverse_bind_matrix;
Mat4 local_transform;
Transform transform_components;
} Joint;
#ifndef TYPED_JOINT_ARRAY
KITC_DECL_TYPED_ARRAY(Joint);
#define TYPED_JOINT_ARRAY
#endif
typedef u32 JointIdx;
typedef struct Armature {
char* label;
arena arena;
Joint_darray* joints;
} Armature;
// NOTE: I think we will need to topologically sort the joints to store them in array if we want to
// do linear array traversal
// when calculating transforms.
typedef struct AnimationSpline {
f32* timestamps;
size_t n_timestamps;
Keyframes values;
Interpolation interpolation;
} AnimationSpline;
typedef struct AnimationSampler {
int current_index;
f32 min;
f32 max;
AnimationSpline animation;
} AnimationSampler;
/** @brief Sample an animation at a given time `t` returning an interpolated keyframe */
Keyframe Animation_Sample(AnimationSampler* sampler, f32 t);
typedef struct AnimationClip {
// 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
AnimationSampler* rotation;
AnimationSampler* translation;
AnimationSampler* scale;
AnimationSampler* weights;
} AnimationClip;
#ifndef TYPED_ANIM_CLIP_ARRAY
KITC_DECL_TYPED_ARRAY(AnimationClip);
#define TYPED_ANIM_CLIP_ARRAY
#endif
typedef struct SkinnedAnimation {
Mat4* joint_matrices;
size_t n_joints;
} SkinnedAnimation;
void animation_play(AnimationClip* clip);
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