import { GLclampf4 } from './tuples';
import { Framebuffer } from './framebuffer';
/**
 * Default framebuffer with framebuffer interface. It is intended for use as default buffer binding and enables lazy
 * target size reconfiguration of stages.
 *
 * ```
 * this._someStage.frame(this._nullFBO, frameNumber, multiFrameNumber);
 * ```
 *
 * Note that this buffer does query its size from the current context's canvas.
 */
export declare class DefaultFramebuffer extends Framebuffer {
    /**
     * @override
     * Default framebuffer cannot be created.
     */
    protected create(): WebGLFramebuffer | undefined;
    /**
     * @override
     * Default framebuffer cannot be deleted.
     */
    protected delete(): void;
    /**
     * @override
     * @returns - Always false, since default buffer cannot have any attachments.
     */
    protected hasAttachment(attachment: GLenum): boolean;
    /**
     * @override
     * Binds the default framebuffer object to the provided target.
     * @param target - Specifying the binding point (target).
     */
    bind(target?: GLenum): void;
    /**
     * @override
     * Sets the clear color used for clearing the default color buffer. In order to have transparency working, the
     * canvas needs to have the alpha  attribute enabled. This stage also supports premultiplied alpha, which is applied
     * automatically when the context's `premultipliedAlpha` attribute is set.
     * @param color - RGBA clear color.
     */
    clearColor(color: GLclampf4): void;
    /**
     * Resets the size (important for valid size change detection in stages).
     */
    resize(): void;
    /**
     * Convenience accessor: returns the renderable width of the canvas back buffer.
     */
    get width(): GLsizei;
    /**
     * Convenience accessor: returns the renderable height of the canvas back buffer.
     */
    get height(): GLsizei;
}