import type { RectangleLike } from '../../../math';
import type { RenderTargetLike, TextureLike } from '../../shared';
import type { GlSystemEvents } from '../system';
import type { GlRenderingContext } from '../types';
import type { WebGLRenderer } from '../WebGLRenderer';
import { Projection2D } from '../../../math';
import { GlSystem } from '../system';
import { GlRenderTarget } from './GlRenderTarget';
export interface GlRenderTargetSystemEvents extends GlSystemEvents {
    updateRenderTarget: [renderTarget: RenderTargetLike | null];
}
export interface GlRenderTargetSystem {
    on: <K extends keyof GlRenderTargetSystemEvents & string>(event: K, listener: (...args: GlRenderTargetSystemEvents[K]) => void) => this;
    once: <K extends keyof GlRenderTargetSystemEvents & string>(event: K, listener: (...args: GlRenderTargetSystemEvents[K]) => void) => this;
    off: <K extends keyof GlRenderTargetSystemEvents & string>(event: K, listener: (...args: GlRenderTargetSystemEvents[K]) => void) => this;
    emit: <K extends keyof GlRenderTargetSystemEvents & string>(event: K, ...args: GlRenderTargetSystemEvents[K]) => this;
}
export declare class GlRenderTargetSystem extends GlSystem {
    install(renderer: WebGLRenderer): void;
    readonly renderTargets: Map<number, RenderTargetLike>;
    readonly glRenderTargets: Map<number, GlRenderTarget>;
    current: RenderTargetLike | null;
    protected _msaaSamples: number[];
    protected _hasMRT: boolean;
    protected _writeDepthTexture: boolean;
    projection: Projection2D;
    /** 4x MSAA, clamped to what the device actually supports (some GPUs cap at 2). */
    protected get _sampleCount(): number;
    protected _updateContext(gl: GlRenderingContext): void;
    bind(renderTarget: RenderTargetLike | null, frame?: RectangleLike): void;
    unbind(): void;
    getGlRenderTarget(renderTarget: RenderTargetLike): GlRenderTarget;
    protected _createGlRenderTarget(renderTarget: RenderTargetLike): GlRenderTarget;
    protected _update(renderTarget: RenderTargetLike, glRenderTarget: GlRenderTarget): void;
    ensureDepthStencil(): void;
    destroyGpuRenderTarget(gpuRenderTarget: GlRenderTarget): void;
    resizeGpuRenderTarget(renderTarget: RenderTargetLike): void;
    protected _initStencil(glRenderTarget: GlRenderTarget): void;
    protected _resizeStencil(glRenderTarget: GlRenderTarget): void;
    protected _resizeColorTextures(renderTarget: RenderTargetLike, glRenderTarget: GlRenderTarget): void;
    finishRenderPass(renderTarget: RenderTargetLike): void;
    copyToTexture(framebuffer: RenderTargetLike, texture: TextureLike): void;
    reset(): void;
}