export declare class TriangleBuffer {
    #private;
    /** Number of triangles currently stored. */
    length: number;
    /** Screen-space X for 3 vertices per triangle (stride 3). */
    screenX: Int32Array;
    /** Screen-space Y for 3 vertices per triangle (stride 3). */
    screenY: Int32Array;
    /** NDC Z for 3 vertices per triangle (stride 3). */
    ndcZ: Float32Array;
    /** Face normal X (stride 1). */
    faceNormalX: Float32Array;
    /** Face normal Y (stride 1). */
    faceNormalY: Float32Array;
    /** Face normal Z (stride 1). */
    faceNormalZ: Float32Array;
    /** Vertex normal X for 3 vertices per triangle (stride 3). */
    vertNormalX: Float32Array;
    /** Vertex normal Y for 3 vertices per triangle (stride 3). */
    vertNormalY: Float32Array;
    /** Vertex normal Z for 3 vertices per triangle (stride 3). */
    vertNormalZ: Float32Array;
    /** UV U coordinate for 3 vertices per triangle (stride 3). */
    uvU: Float32Array;
    /** UV V coordinate for 3 vertices per triangle (stride 3). */
    uvV: Float32Array;
    /** Per-vertex fog factor for 3 vertices per triangle (stride 3). 0 = no fog, 1 = fully fogged. */
    fogFactor: Float32Array;
    /** Original geometry vertex index for 3 vertices per triangle (stride 3). */
    vertexIndex: Int32Array;
    /** Highest vertex index seen across all appended triangles. */
    maxVertexIndex: number;
    /** Centroid Z = (z0+z1+z2)/3, used for painter sort (stride 1). */
    centroidZ: Float32Array;
    /** Iteration index -> physical triangle index, populated by buildSortOrder. */
    sortOrder: Uint32Array;
    /** Whether sortOrder should be used for iteration. */
    sortOrderActive: boolean;
    constructor(capacity?: number);
    /** Reset length to 0, preserving allocated arrays for reuse. */
    reset(): void;
    /** Grow all arrays to at least the given capacity using 2x doubling. Copies existing data. */
    ensureCapacity(needed: number): void;
    /** Append one triangle. CentroidZ is computed from z0, z1, z2. */
    append(sx0: number, sy0: number, sx1: number, sy1: number, sx2: number, sy2: number, z0: number, z1: number, z2: number, fnx: number, fny: number, fnz: number, vn0x: number, vn0y: number, vn0z: number, vn1x: number, vn1y: number, vn1z: number, vn2x: number, vn2y: number, vn2z: number, u0: number, v0: number, u1: number, v1: number, u2: number, v2: number, ff0?: number, ff1?: number, ff2?: number, vi0?: number, vi1?: number, vi2?: number): number;
    /** Fill sortOrder with identity [0, 1, 2, ...length-1]. */
    buildSortOrder(): void;
    /** Sort sortOrder by centroidZ descending (back-to-front painter's order). */
    sort(): void;
}
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