import { vec2, vec3 } from 'gl-matrix';
/**
 * Vertex cloud that describes each glyph that is to be rendered on the screen.
 */
export declare class GlyphVertices {
    static readonly FLOATS_PER_TEXCOORD = 4;
    static readonly FLOATS_PER_ORIGIN = 3;
    static readonly FLOATS_PER_TANGENT = 3;
    static readonly FLOATS_PER_UP = 3;
    /** @see {@link origins} */
    protected _origins: Float32Array;
    /** @see {@link tangents} */
    protected _tangents: Float32Array;
    /** @see {@link ups} */
    protected _ups: Float32Array;
    /** @see {@link texCoords} */
    protected _texCoords: Float32Array;
    /**
     * Concatenates multiple glyph vertices into a single new glyph vertices object.
     * @param array - Array of glyph vertices. Undefined glyph vertices will be ignored.
     */
    static concat(array: Array<GlyphVertices | undefined>): GlyphVertices;
    /**
     * Constructs a specialized arrays representing glyph vertex data.
     * @param numberOfGlyphs - The number of glyph vertices required (number of glyphs).
     */
    constructor(numberOfGlyphs: number);
    /**
     * Efficiently reduces the size of all underlying float arrays (copies data if reduced).
     * @param numberOfGlyphs - Target number of glyphs to reduce the vertices to.
     */
    shrink(numberOfGlyphs: number): void;
    /**
     * Typed vec2 view to the lower left texture coordinate of the glyph at given index.
     * @param index - Index of the glyph to return the lower left texture coordinate of.
     */
    uvLowerLeft(index: number): vec2;
    /**
     * Typed vec2 view to the upper right texture coordinate of the glyph at given index.
     * @param index - Index of the glyph to return the upper right texture coordinate of.
     */
    uvUpperRight(index: number): vec2;
    /**
     * Typed vec3 view to the origin of the glyph at given index.
     * @param index - Index of the glyph to return the origin of.
     */
    origin(index: number): vec3;
    /**
     * Typed vec3 view to the tangent of the glyph at given index.
     * @param index - Index of the glyph to return the tangent of.
     */
    tangent(index: number): vec3;
    /**
     * Typed vec3 view to the up vector of the glyph at given index.
     * @param index - Index of the glyph to return the up vector of.
     */
    up(index: number): vec3;
    /**
     * Number of glyph vertices.
     */
    get length(): number;
    /**
     * Read-access to all glyph vertices' origins in a single typed buffer.
     */
    get origins(): Float32Array;
    /**
     * Read-access to all glyph vertices' tangent vectors in a single typed buffer.
     */
    get tangents(): Float32Array;
    /**
     * Read-access to all glyph vertices' up vectors in a single typed buffer.
     */
    get ups(): Float32Array;
    /**
     * Read-access to all glyph vertices' texture coordinates (lower left and upper right) in a single typed buffer.
     */
    get texCoords(): Float32Array;
}