import Texture from './Texture';
import { RendererViewport } from './Renderer';
import { GLEnum } from './core/type';
interface FrameBufferOpts {
    /**
     * If use depth buffer
     */
    depthBuffer: boolean;
}
interface FrameBuffer extends FrameBufferOpts {
}
declare class FrameBuffer {
    viewport?: RendererViewport;
    autoGenerateMipmap?: boolean;
    private _width;
    private _height;
    mipmapLevel: number;
    private _textures;
    constructor(opts?: Partial<FrameBufferOpts>);
    /**
     * Get textures attached to framebuffer
     */
    getTextures(): Record<string, {
        texture: Texture<unknown>;
        target: number;
    }>;
    /**
     * Get width of framebuffer
     */
    getWidth(): number;
    /**
     * Get height of framebuffer
     */
    getHeight(): number;
    /**
     * Get viewport of bound framebuffer
     */
    getViewport(): RendererViewport;
    clearTextures(): void;
    /**
     * Attach a texture(RTT) to the framebuffer
     * @param  {clay.Texture} texture
     * @param  {number} [attachment=gl.COLOR_ATTACHMENT0]
     * @param  {number} [target=gl.TEXTURE_2D]
     */
    attach(texture: Texture, attachment?: GLEnum, target?: GLEnum): void;
    /**
     * Detach a texture
     * @param  {number} [attachment=gl.COLOR_ATTACHMENT0]
     * @param  {number} [target=gl.TEXTURE_2D]
     */
    detach(attachment: GLEnum, target: GLEnum): void;
}
export default FrameBuffer;