/**
 * @holoscript/core LOD Performance Metrics
 *
 * Real-time performance tracking and profiling for LOD system.
 * Provides detailed metrics for optimization and debugging.
 *
 * v3.5 Performance Optimization
 */
export interface LODLevelHistogram {
    level: number;
    objectCount: number;
    triangleCount: number;
    memoryBytes: number;
    percentage: number;
}
export interface TransitionCostAnalysis {
    entityId: string;
    fromLevel: number;
    toLevel: number;
    costMs: number;
    timestamp: number;
}
export interface PerformanceSnapshot {
    timestamp: number;
    frameTimeMs: number;
    lodSelectionTimeMs: number;
    transitionTimeMs: number;
    totalObjects: number;
    activeTransitions: number;
    memoryUsageMB: number;
    averageLODLevel: number;
}
export interface ProfilingData {
    name: string;
    durationMs: number;
    callCount: number;
    averageMs: number;
    minMs: number;
    maxMs: number;
}
/**
 * Real-time performance tracking for LOD system
 */
export declare class LODPerformanceMetrics {
    private histogram;
    private transitionCosts;
    private snapshots;
    private profilingData;
    private maxHistorySize;
    private maxTransitionHistory;
    private enabled;
    private totalTransitions;
    private totalSelections;
    private totalFrames;
    constructor(enabled?: boolean);
    /**
     * Update LOD level histogram
     */
    updateHistogram(objectsPerLevel: Map<number, number>, trianglesPerLevel: Map<number, number>): void;
    /**
     * Get LOD level histogram
     */
    getHistogram(): LODLevelHistogram[];
    /**
     * Get formatted histogram
     */
    getFormattedHistogram(): string;
    /**
     * Record transition cost
     */
    recordTransitionCost(entityId: string, fromLevel: number, toLevel: number, costMs: number): void;
    /**
     * Get transition cost statistics
     */
    getTransitionCostStats(): {
        average: number;
        min: number;
        max: number;
        total: number;
        count: number;
    };
    /**
     * Get recent transition costs
     */
    getRecentTransitions(count?: number): TransitionCostAnalysis[];
    /**
     * Record performance snapshot
     */
    recordSnapshot(frameTimeMs: number, lodSelectionTimeMs: number, transitionTimeMs: number, totalObjects: number, activeTransitions: number, memoryUsageMB: number, averageLODLevel: number): void;
    /**
     * Get performance snapshots
     */
    getSnapshots(count?: number): PerformanceSnapshot[];
    /**
     * Get average performance over recent snapshots
     */
    getAveragePerformance(sampleCount?: number): {
        frameTimeMs: number;
        lodSelectionTimeMs: number;
        transitionTimeMs: number;
        fps: number;
    };
    /**
     * Start profiling a code section
     */
    startProfile(_name: string): number;
    /**
     * End profiling and record result
     */
    endProfile(name: string, startTime: number): void;
    /**
     * Get profiling data
     */
    getProfilingData(): ProfilingData[];
    /**
     * Get profiling data by name
     */
    getProfilingDataByName(name: string): ProfilingData | undefined;
    /**
     * Reset profiling data
     */
    resetProfiling(): void;
    /**
     * Export metrics to telemetry system
     */
    exportToTelemetry(): {
        histogram: LODLevelHistogram[];
        transitionStats: ReturnType<LODPerformanceMetrics['getTransitionCostStats']>;
        averagePerformance: ReturnType<LODPerformanceMetrics['getAveragePerformance']>;
        profiling: ProfilingData[];
        counters: {
            totalTransitions: number;
            totalSelections: number;
            totalFrames: number;
        };
    };
    /**
     * Export to JSON
     */
    exportToJSON(): string;
    /**
     * Get formatted debug output
     */
    getDebugOutput(): string;
    /**
     * Enable metrics collection
     */
    enable(): void;
    /**
     * Disable metrics collection
     */
    disable(): void;
    /**
     * Check if metrics are enabled
     */
    isEnabled(): boolean;
    /**
     * Clear all metrics
     */
    clear(): void;
    /**
     * Set maximum history size
     */
    setMaxHistorySize(size: number): void;
    /**
     * Get total transition count
     */
    getTotalTransitions(): number;
    /**
     * Get total selection count
     */
    getTotalSelections(): number;
    /**
     * Get total frame count
     */
    getTotalFrames(): number;
    /**
     * Increment selection counter
     */
    incrementSelections(): void;
}
/**
 * Create LOD performance metrics tracker
 */
export declare function createLODPerformanceMetrics(enabled?: boolean): LODPerformanceMetrics;
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