import type { ShaderMacros } from '../render';
import { ShaderType } from '../material';
export interface ShaderCodeOptions {
    level: number;
    shaderType: ShaderType;
    shader: string;
    macros?: ShaderMacros;
    removeVersion?: boolean;
}
export declare class ShaderFactory {
    static registerInclude(includeName: string, includeSource: string): void;
    static unRegisterInclude(includeName: string): void;
    static unRegisterAllIncludes(): void;
    /**
     * 生成 shader，检测到 WebGL1 上下文会降级
     * @param macros - 宏定义数组
     * @param shader - 原始 shader 文本
     * @param shaderType - shader 类型
     * @return 去除版本号的 shader 文本
     */
    static genFinalShaderCode(options: ShaderCodeOptions): string;
    /**
     * Convert lower GLSL version to GLSL 300 es.
     * @param source - code
     * @param isFragment - Whether it is a fragment shader.
     * */
    private static convertTo300;
    private static parseIncludes;
    private static genMacroString;
    private static genShaderVersion;
    private static isVersion300;
    private static removeWebGLVersion;
    private static has300Output;
    private static replaceMRTShader;
}