export declare abstract class BaseShader {
    protected gl: WebGLRenderingContext | WebGL2RenderingContext;
    protected vertexShaderCode: string;
    protected fragmentShaderCode: string;
    protected program: WebGLProgram | undefined;
    /**
     * Constructor. Compiles shader.
     *
     * @param gl WebGL context.
     */
    constructor(gl: WebGLRenderingContext | WebGL2RenderingContext);
    /**
     * Used to fill shader code. Put actual shader code to this.vertexShaderCode and this.fragmentShaderCode
     */
    abstract fillCode(): void;
    /**
     * Creates WebGL shader from code.
     *
     * @param type Shader type.
     * @param code GLSL code.
     * @returns Shader or `undefined` if there were errors during shader compilation.
     */
    protected getShader(type: GLenum, code: string): WebGLShader | undefined;
    /** Retrieve and save uniforms and attributes for actual shader here */
    abstract fillUniformsAttributes(): void;
    /**
     * Get shader unform location.
     *
     * @param uniform Uniform name.
     * @return Uniform location.
     */
    getUniform(uniform: string): WebGLUniformLocation;
    /**
     * Get shader attribute location.
     *
     * @param attrib Attribute name.
     * @return Attribute location.
     */
    getAttrib(attrib: string): number;
    /** Initializes shader. */
    protected initShader(): void;
    /** Activates shader. */
    use(): void;
    /** Deletes shader. */
    deleteProgram(): void;
}