/**
 * Derives GPUVertexBufferLayouts (one per-vertex, one per-instance) from lists
 * of vertex formats, assigning consecutive shader locations.
 *
 * The formats are fixed at construction, so everything derived from them is
 * built once. `layoutKey` is what a pipeline cache keys on, and building it
 * here rather than at every lookup keeps a per-draw JSON.stringify of the whole
 * layout off the hot path.
 */
export declare class VertexBufferManager {
    private readonly buffers;
    private readonly vertexLength;
    private readonly instanceLength;
    readonly layoutKey: string;
    constructor(vertexFormats?: GPUVertexFormat[], instanceFormats?: GPUVertexFormat[]);
    /** Layouts for pipeline creation; empty layouts are omitted. */
    getBuffers(): GPUVertexBufferLayout[];
    /** Number of float elements per vertex. */
    getVertexLength(): number;
    /** Number of float elements per instance. */
    getInstanceLength(): number;
}