import { vec2 } from "gl-matrix";
import { ShaderProgramInfo } from "../utils/gl";
import Color from "../utils/color";
import Camera from "../camera/camera";
import Shape from "../shapes/shape";
import { ZMap } from "../utils/types";
interface RenderQueueItem {
    shape: Shape;
    position: vec2;
    rotation: number;
}
/**
 * Renders single instances of shapes at a time.
 */
export default abstract class Renderer {
    private static gl;
    private static resolutionScale;
    private static mode;
    private static camera;
    /**
     * The scale applied to shape vertices to obtain their clip space vertices.
     */
    protected static scale: vec2;
    protected static queue: ZMap<RenderQueueItem[]>;
    static positionBuffer: WebGLBuffer;
    static texBuffer: WebGLBuffer;
    static uvBuffer: WebGLBuffer;
    static indexBuffer: WebGLBuffer;
    static rectProgram: WebGLProgram;
    static rectProgramInfo: ShaderProgramInfo;
    static circleProgram: WebGLProgram;
    static circleProgramInfo: ShaderProgramInfo;
    static triangleProgram: WebGLProgram;
    static triangleProgramInfo: ShaderProgramInfo;
    static metaballProgram: WebGLProgram;
    static metaballProgramInfo: ShaderProgramInfo;
    /**
     * Sets up the renderer to be used for rendering.
     *
     * Creates the webgl2 rendering context for the canvas and clears the webgl buffer.
     *
     * @throws When browser does not support webgl 2.0
     *
     * @param canvas The canvas to grab webgl context from
     * @param opts {@link WebGLContextAttributes} to pass to the `getContext` call
     */
    static init(canvas: HTMLCanvasElement, opts?: WebGLContextAttributes): void;
    private static initShaders;
    /**
     * Resizes the `width` and `height` of the canvas attached to `gl` to the canvas' `clientWidth` and `clientHeight` multiplied by the `resolutionScale` or 1.
     */
    static resizeToCanvas(): void;
    static clear(clearColor: Color): void;
    /**
     * Renders all items currently in the render queue and clears the queue.
     *
     * Should be called at the end of each frame.
     *
     * If there is no camera specified in {@link Renderer} then nothing will be rendered.
     */
    static flush(z: number): void;
    /**
     * Adds a shape to the render queue.
     *
     * @param shape The shape to queue
     * @param position The x and y position to render the rectangle at
     * @param rotation The rotation to apply to the shape
     * @param zIndex The z position of the rendered rectangle
     * @param scale The world to clip space scale value
     */
    static queueShape(shape: Shape, position?: vec2, rotation?: number, zIndex?: number): void;
    /**
     * Renders a shape from a {@link RenderQueueItem} object.
     *
     * @param item The {@link RenderQueueItem} to render
     * @param zIndex The z index to render the shape at
     */
    private static renderQueueItem;
    /**
     * Gets the renderer's webgl context.
     *
     * @returns The renderer's webgl context
     */
    static getGL(): WebGL2RenderingContext;
    /**
     * Sets the resolution scale to use when rendering.
     *
     * The width and height of the renderer canvas are set to `clientWidth * resolutionScale` and `clientHeight * resolutionScale` respectively.
     *
     * @param resolutionScale The new resolution scale to use
     */
    static setResolutionScale(resolutionScale: number): void;
    /**
     * Gets the renderer's current resolution scale.
     *
     * @returns The renderer's current resolution scale
     */
    static getResolutionScale(): number;
    /**
     * Sets the mode the renderer will use for drawing.
     *
     * @throws When the provided mode is not TRIANGLES, LINES or POINTS
     *
     * @param mode The mode to use
     */
    static setMode(mode: "TRIANGLES" | "LINES" | "POINTS"): void;
    /**
     * Gets the current webgl rendering mode being used by the renderer.
     *
     * @returns The rendering mode
     */
    static getMode(): "TRIANGLES" | "LINES" | "POINTS";
    /**
     * Sets the camera to use for rendering.
     *
     * @param camera The camera to use for rendering
     */
    static useCamera(camera: Camera): void;
    /**
     * Gets the camera that is currently being used for rendering.
     *
     * @returns The camera that is currently being used for rendering
     */
    static getCamera(): Camera;
    /**
     * Set the scale that is applied to vertices to obtain the vertices in clip space.
     *
     * @param scale The scaling vector
     */
    static setScale(scale: vec2): void;
    /**
     * Gets the scale that is applied to vertices to obtain the vertices in clip space.
     *
     * @returns The scaling vector
     */
    static getScale(): vec2;
    /**
     * Gets the render queue.
     *
     * @returns the render queue
     */
    static getQueue(): ZMap<RenderQueueItem[]>;
    /**
     * Gets the maximum zIndex used by the queue.
     *
     * @returns The max zIndex of the queue
     */
    static getQueueMax(): number;
    /**
     * Gets the minimum zIndex used by the queue.
     *
     * @returns The min zIndex of the queue
     */
    static getQueueMin(): number;
}
export {};