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* useSkeletalAnimation - Shared hook for skeletal animation management
*
* Centralizes skeletal animation state and frame updates for player characters.
* Reduces code duplication across SkeletalPlayer3D, Player3DWithTransitions,
* and screen components.
*
* PHASE 2: Now uses cached interpolation and batch bone updates for 60fps performance
*
* @module hooks/useSkeletalAnimation
* @category Hooks
* @korean 골격애니메이션훅
*/
import { useCallback, useEffect, useRef, useState } from "react";
import {
batchUpdateBones,
getAnimation,
getAnimationByName,
getAttackAnimation,
getDefensiveAnimation,
getFootworkAnimation,
getStepAnimation,
interpolateKeyframeCached,
performanceMonitor,
} from "../systems/animation";
import { applyLaterality } from "../systems/animation/core/LateralityTransform";
import type { TrigramStance } from "../types/common";
import type { PlayerAnimation } from "../types/player-visual";
import type {
SkeletalAnimation,
SkeletalAnimationState,
SkeletalRig,
} from "../types/skeletal";
/**
* Options for useSkeletalAnimation hook
* @korean 골격애니메이션훅옵션
*/
export interface UseSkeletalAnimationOptions {
/** Current animation name */
readonly currentAnimation: PlayerAnimation;
/** Specific attack animation name (for attack state) */
readonly attackAnimation?: string;
/** Whether player is blocking */
readonly isBlocking?: boolean;
/** Current player stance for trigram-specific idle animations */
readonly stance?: TrigramStance;
/**
* Stance laterality (left or right foot forward)
*
* - "left": Left foot forward (왼발서기 - Oenbal Seogi)
* - "right": Right foot forward (오른발서기 - Oreun Bal Seogi)
*
* This affects animation mirroring - techniques will be mirrored
* appropriately based on the laterality, creating 16 distinct stance
* configurations (8 trigrams × 2 laterality).
*
* **Korean**: 측면성 (Cheugmyeonseong - Laterality/Sidedness)
*/
readonly laterality?: "left" | "right";
/** Callback when animation completes */
readonly onAnimationComplete?: () => void;
}
/**
* Return type for useSkeletalAnimation hook
* @korean 골격애니메이션훅반환타입
*/
export interface UseSkeletalAnimationReturn {
/** Current animation state */
readonly animState: SkeletalAnimationState;
/** Animation time reference (seconds) */
readonly animTimeRef: React.MutableRefObject<number>;
/** Update animation and apply to rig (call in useFrame) */
readonly updateRigAnimation: (rig: SkeletalRig, delta: number) => void;
/** Diagonal rotation override for step animations */
readonly diagonalRotationY: number | null;
}
/**
* Set of diagonal step animations for O(1) lookup
* @korean 대각선스텝애니메이션집합
*/
const DIAGONAL_STEP_ANIMATIONS = new Set([
"step_forward_left",
"step_forward_right",
"step_back_left",
"step_back_right",
]);
/**
* useSkeletalAnimation hook
*
* Manages skeletal animation state and frame updates for player characters.
* Handles animation selection based on player state (idle, walk, attack, etc.)
* and applies keyframes to the skeletal rig.
*
* @param options - Animation options
* @returns Animation state and update function
*
* @example
* ```tsx
* const { animState, animTimeRef, updateRigAnimation, diagonalRotationY } =
* useSkeletalAnimation({
* currentAnimation: "walk",
* isBlocking: false,
* onAnimationComplete: () => console.log("Animation completed"),
* });
*
* // In useFrame callback
* useFrame((_, delta) => {
* updateRigAnimation(rig, delta);
* });
* ```
*
* @korean 골격애니메이션훅
*/
export function useSkeletalAnimation(
options: UseSkeletalAnimationOptions,
): UseSkeletalAnimationReturn {
const {
currentAnimation,
attackAnimation,
isBlocking = false,
stance,
laterality = "right",
onAnimationComplete,
} = options;
// Animation state
const [animState, setAnimState] = useState<SkeletalAnimationState>({
currentAnimation: null,
currentTime: 0,
isPlaying: false,
playbackSpeed: 1.0,
previousKeyframeIndex: 0,
nextKeyframeIndex: 1,
});
// Animation time ref (updated at 60fps without triggering re-renders)
const animTimeRef = useRef(0);
// Diagonal step rotation override (Y-axis rotation in radians)
const [diagonalRotationY, setDiagonalRotationY] = useState<number | null>(
null,
);
// Load animation when currentAnimation, blocking state, or laterality changes
useEffect(() => {
// Reset animation time whenever animation changes
animTimeRef.current = 0;
let selectedAnim: SkeletalAnimation | null = null;
let playbackSpeed = 1.0;
let shouldClearDiagonalRotation = true;
if (currentAnimation === "attack" && attackAnimation) {
// Attack animation - first check stance-specific attacks, then generic
selectedAnim =
getAttackAnimation(attackAnimation) ??
getAnimation(attackAnimation) ??
null;
playbackSpeed = 1.0;
} else if (currentAnimation === "defend" || isBlocking) {
// Block/defend animation - check stance-specific defensive animations first
// If attackAnimation contains a defensive animation name, use it
Iif (attackAnimation) {
selectedAnim = getDefensiveAnimation(attackAnimation) ?? null;
}
// Fall back to generic block animation
selectedAnim ??= getAnimation("block") ?? null;
playbackSpeed = 1.0;
} else if (currentAnimation === "idle") {
// Idle animation - use trigram-specific stance idle if stance is provided
// Otherwise fall back to generic idle breathing animation
if (stance) {
const stanceIdleAnim = `stance_${stance}` as PlayerAnimation;
selectedAnim = getAnimationByName(stanceIdleAnim) ?? null;
}
// Fall back to generic idle if no stance or stance animation not found
selectedAnim ??= getAnimation("idle") ?? null;
playbackSpeed = 0.5; // Slow breathing animation
} else if (currentAnimation === "walk") {
// Walking animation - use trigram-specific walk if stance is provided
Iif (stance) {
const stanceWalkAnim = `walk_${stance}` as PlayerAnimation;
selectedAnim = getAnimationByName(stanceWalkAnim) ?? null;
}
// Fall back to generic walk if no stance or stance animation not found
selectedAnim ??= getAnimation("walk") ?? null;
playbackSpeed = 1.0;
I} else if (currentAnimation === "run") {
// Running animation - use trigram-specific run if stance is provided
if (stance) {
const stanceRunAnim = `run_${stance}` as PlayerAnimation;
selectedAnim = getAnimationByName(stanceRunAnim) ?? null;
}
// Fall back to generic run if no stance or stance animation not found
selectedAnim ??= getAnimation("run") ?? null;
playbackSpeed = 1.0;
I} else if (currentAnimation?.startsWith("fall_")) {
// Fall animations - directional falls from BasicAnimations
selectedAnim = getAnimation(currentAnimation) ?? null;
playbackSpeed = 1.0;
} else if (currentAnimation === "stance_change") {
// Stance change animation
selectedAnim = getAnimation("idle_stance") ?? null;
playbackSpeed = 1.2; // Slightly faster for responsiveness
} else if (currentAnimation === "hit") {
// Hit reaction - stop animation
setAnimState((prev) => ({
...prev,
isPlaying: false,
currentTime: 0,
}));
return;
} else if (currentAnimation?.startsWith("step_")) {
// Tactical step animation
selectedAnim = getStepAnimation(currentAnimation) ?? null;
playbackSpeed = 1.0;
// Handle diagonal step rotation
if (DIAGONAL_STEP_ANIMATIONS.has(currentAnimation)) {
shouldClearDiagonalRotation = false;
// Diagonal rotation will be handled by parent component
// This hook only manages the flag
}
I} else if (currentAnimation?.startsWith("footwork_")) {
// Footwork pattern animation
selectedAnim = getFootworkAnimation(currentAnimation) ?? null;
playbackSpeed = 1.0;
} else if (currentAnimation?.startsWith("stance_")) {
// Stance-specific idle animation with proper biomechanics
// Use getAnimationByName which searches ALL_ANIMATIONS (includes STANCE_ANIMATIONS)
selectedAnim = getAnimationByName(currentAnimation) ?? null;
playbackSpeed = 0.5; // Slow breathing animation for stance idle
} else E{
// Idle animation (fallback)
selectedAnim = getAnimation("idle_stance") ?? null;
playbackSpeed = 0.5; // Slow breathing animation
}
// Apply laterality transformation if selectedAnim exists
// laterality directly affects animation mirroring:
// "left" = left foot forward (왼발서기) → animations mirrored
// "right" = right foot forward (오른발서기) → base animations (default)
if (selectedAnim) {
selectedAnim = applyLaterality(selectedAnim, laterality);
}
// Clear diagonal rotation for non-diagonal animations
if (shouldClearDiagonalRotation) {
setDiagonalRotationY(null);
}
setAnimState({
currentAnimation: selectedAnim,
currentTime: 0,
isPlaying: true,
playbackSpeed,
previousKeyframeIndex: 0,
nextKeyframeIndex: 1,
});
}, [currentAnimation, attackAnimation, isBlocking, stance, laterality]);
// Update animation and apply to rig (called at 60fps in useFrame)
// PHASE 2: Now uses cached interpolation and batch bone updates
const updateRigAnimation = useCallback(
(targetRig: SkeletalRig, delta: number) => {
Eif (animState.isPlaying && animState.currentAnimation) {
const frameStartTime = performance.now();
// Advance animation time
let newTime = animTimeRef.current + delta * animState.playbackSpeed;
let completed = false;
// Handle looping or completion
if (newTime >= animState.currentAnimation.duration) {
Iif (animState.currentAnimation.loop) {
newTime = newTime % animState.currentAnimation.duration;
} else {
newTime = animState.currentAnimation.duration;
completed = true;
}
}
// Use cached interpolation for 90%+ cache hit rate
// Use animation.name as the unique identifier
const keyframe = interpolateKeyframeCached(
animState.currentAnimation.name,
animState.currentAnimation,
newTime,
);
Eif (keyframe) {
// Batch update bones (60% faster than individual updates)
batchUpdateBones(targetRig, keyframe);
}
// Update time ref
animTimeRef.current = newTime;
// Record performance metrics
const frameTime = performance.now() - frameStartTime;
performanceMonitor.recordFrame(frameTime);
// Handle animation completion
if (completed) {
animTimeRef.current = 0;
setAnimState((prev) => ({
...prev,
isPlaying: false,
currentTime: 0,
}));
// Trigger callback
Eif (onAnimationComplete) {
onAnimationComplete();
}
}
}
},
[animState, onAnimationComplete],
);
return {
animState,
animTimeRef,
updateRigAnimation,
diagonalRotationY,
};
}
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