export interface UniformGroupOptions {
    /**
     * If true the group is treated as a Uniform Buffer Object (WebGL2 only). The
     * whole group is uploaded as a single buffer instead of per-uniform calls.
     */
    ubo?: boolean;
    /**
     * If true the group is only re-uploaded to a program when its `_dirtyId`
     * changes (you are responsible for calling `update()`); otherwise it is
     * re-uploaded every time it is used.
     */
    isStatic?: boolean;
}
/**
 * A named bag of uniform values shared across shaders, with a version counter
 * (`_dirtyId`) so the renderer can skip re-uploading it when nothing changed.
 *
 * This is the unit the renderer tracks per program (see
 * `GlShaderSystem.updateUniformGroup`): each program records the last `_dirtyId`
 * it synced, and re-uploads only when the group's id moved on.
 */
export declare class UniformGroup<T extends Record<string, any> = Record<string, any>> {
    readonly isUniformGroup = true;
    /** unique id used as the key for per-program dirty tracking */
    readonly uid: number;
    uniforms: T;
    ubo: boolean;
    isStatic: boolean;
    /** bumped whenever the group's data changes; compared against per-program last-synced id */
    _dirtyId: number;
    constructor(uniforms: T, options?: UniformGroupOptions);
    /** Flag the group's data as changed so it is re-uploaded on next use. */
    update(): void;
}