import type * as spec from '@galacean/effects-specification';
import type { vec4 } from '@galacean/effects-specification';
import type { RendererComponent } from '../components';
import type { Engine } from '../engine';
import type { MeshDestroyOptions, Renderer } from '../render';
import type { Framebuffer } from '../render';
import type { TextureConfigOptions, TextureLoadAction } from '../texture';
import { Texture } from '../texture';
import type { Disposable, Sortable } from '../utils';
import { DestroyOptions } from '../utils';
import type { Renderbuffer } from './renderbuffer';
export declare const RenderPassPriorityPrepare = 0;
export declare const RenderPassPriorityNormal = 1000;
export declare const RenderPassPriorityPostprocess = 3000;
/**
 * RenderPass Attachment 存储类型
 */
export declare enum RenderPassAttachmentStorageType {
    none = 0,
    color = 1,
    stencil_8_opaque = 2,
    depth_16_opaque = 3,
    depth_stencil_opaque = 4,
    depth_16_texture = 5,
    depth_24_stencil_8_texture = 6
}
/**
 * Attachment 结束后清除行为
 */
export declare enum TextureStoreAction {
    /**
     * 不清除 Attachment
     */
    store = 0,
    /**
     * 清除 Attachment
     */
    clear = 2
}
/**
 * RenderPass 开始前的清除行为
 */
export interface RenderPassClearAction {
    clearColor?: vec4;
    colorAction?: TextureLoadAction;
    clearDepth?: number;
    depthAction?: TextureLoadAction;
    clearStencil?: number;
    stencilAction?: TextureLoadAction;
}
/**
 * RenderPass 结束后的清除行为
 */
export interface RenderPassStoreAction {
    colorAction?: TextureStoreAction;
    depthAction?: TextureStoreAction;
    stencilAction?: TextureStoreAction;
}
export interface RenderPassColorAttachmentTextureOptions extends spec.TextureFormatOptions, TextureConfigOptions {
    size?: [x: number, y: number];
}
/**
 * RenderPass ColorAttachment 选项
 */
export interface RenderPassColorAttachmentOptions {
    size?: [x: number, y: number];
    name?: string;
    /**
     * ColorAttachment 的纹理参数
     */
    texture?: Texture | RenderPassColorAttachmentTextureOptions;
    /**
     * ColorAttachment 的 Buffer 参数
     */
    buffer?: Renderbuffer;
    /**
     * WebGL2 下 Renderbuffer 超采数目。默认是0，即不启用超采。
     * @default 0
     */
    multiSample?: number;
    /**
     * 是否持久的对象
     */
    persistent?: boolean;
}
export declare class RenderTargetHandle implements Disposable {
    texture: Texture;
    readonly textureOptions?: RenderPassColorAttachmentTextureOptions;
    readonly externalTexture: boolean;
    protected destroyed: boolean;
    constructor(engine: Engine, options?: RenderPassColorAttachmentOptions);
    dispose(): void;
    get isDestroyed(): boolean;
    get storageType(): RenderPassAttachmentStorageType;
    get size(): [x: number, y: number];
    get width(): number;
    get height(): number;
}
export interface RenderPassDepthStencilAttachmentOptions {
    storageType: RenderPassAttachmentStorageType;
    storage?: Renderbuffer;
    texture?: Texture;
}
/**
 * RenderPass Attachment 销毁类型
 */
export declare enum RenderPassDestroyAttachmentType {
    /**
     * 强制销毁
     */
    force = 0,
    /**
     * 保留，不销毁
     */
    keep = 1,
    /**
     * 如果是外部传入的 Attachment，就不销毁
     */
    keepExternal = 2,
    /**
     * 强制销毁
     */
    destroy = 0
}
export type RenderPassDestroyOptions = {
    meshes?: MeshDestroyOptions | DestroyOptions.keep;
    colorAttachment?: RenderPassDestroyAttachmentType;
    depthStencilAttachment?: RenderPassDestroyAttachmentType;
};
/**
 * RenderPass 抽象类
 */
export declare class RenderPass implements Disposable, Sortable {
    /**
     * 优先级
     */
    priority: number;
    /**
     * 名称
     */
    name: string;
    /**
     * 包含的 Mesh 列表
     */
    readonly meshes: RendererComponent[];
    protected disposed: boolean;
    protected framebuffer: Framebuffer | null;
    protected renderer: Renderer;
    constructor(renderer: Renderer);
    get isDisposed(): boolean;
    get viewport(): spec.vec4;
    addMesh(mesh: RendererComponent): void;
    removeMesh(mesh: RendererComponent): void;
    /**
     * 配置当前pass的RT，在每帧渲染前调用
     */
    configure(renderer: Renderer): void;
    /**
     * 执行当前pass，每帧调用一次
     */
    execute(renderer: Renderer): void;
    /**
     * 每帧所有的pass渲染完后调用，用于清空临时的RT资源
     */
    onCameraCleanup(renderer: Renderer): void;
    /**
     * 获取当前视口大小，格式：[x偏移，y偏移，宽度，高度]
     */
    getViewport(): vec4;
    /**
     * 销毁 RenderPass
     * @param options - 有选择销毁内部对象
     */
    dispose(options?: RenderPassDestroyOptions): void;
}