/**
 *  LittleJS WebGL Interface
 *  <br> - All webgl used by the engine is wrapped up here
 *  <br> - Can be disabled with glEnable to revert to 2D canvas rendering
 *  <br> - Batches sprite rendering on GPU for incredibly fast performance
 *  <br> - Sprite transform math is done in the shader where possible
 *  <br> - For normal stuff you won't need to call any functions in this file
 *  <br> - For advanced stuff there are helper functions to create shaders, textures, etc
 *  @namespace WebGL
 */
/** The WebGL canvas which appears above the main canvas and below the overlay canvas
 *  @type {HTMLCanvasElement}
 *  @memberof WebGL */
export declare let glCanvas: any;
/** 2d context for glCanvas
 *  @type {WebGLRenderingContext}
 *  @memberof WebGL */
export declare let glContext: any;
/** Main tile sheet texture automatically loaded by engine
 *  @type {WebGLTexture}
 *  @memberof WebGL */
export declare let glTileTexture: any;
export declare let glActiveTexture: any, glShader: any, glPositionData: any, glColorData: any, glBatchCount: number, glDirty: number, glAdditive: number;
export declare function glInit(): void;
/** Set the WebGl blend mode, normally you should call setBlendMode instead
 *  @param {Boolean} [additive=0]
 *  @memberof WebGL */
export declare function glSetBlendMode(additive?: number): void;
/** Set the WebGl texture, not normally necessary unless multiple tile sheets are used
 *  <br> - This may also flush the gl buffer resulting in more draw calls and worse performance
 *  @param {WebGLTexture} [texture=glTileTexture]
 *  @memberof WebGL */
export declare function glSetTexture(texture?: any): void;
/** Compile WebGL shader of the given type, will throw errors if in debug mode
 *  @param {String} source
 *  @param          type
 *  @return {WebGLShader}
 *  @memberof WebGL */
export declare function glCompileShader(source: any, type: any): any;
/** Create WebGL program with given shaders
 *  @param {WebGLShader} vsSource
 *  @param {WebGLShader} fsSource
 *  @return {WebGLProgram}
 *  @memberof WebGL */
export declare function glCreateProgram(vsSource: any, fsSource: any): any;
/** Create WebGL buffer
 *  @param bufferType
 *  @param size
 *  @param usage
 *  @return {WebGLBuffer}
 *  @memberof WebGL */
export declare function glCreateBuffer(bufferType: any, size: any, usage: any): any;
/** Create WebGL texture from an image
 *  @param {Image} image
 *  @return {WebGLTexture}
 *  @memberof WebGL */
export declare function glCreateTexture(image: any): any;
export declare function glPreRender(width: any, height: any): void;
/** Draw all sprites and clear out the buffer, called automatically by the system whenever necessary
 *  @memberof WebGL */
export declare function glFlush(): void;
/** Draw any sprites still in the buffer, copy to main canvas and clear
 *  @param {CanvasRenderingContext2D} context
 *  @param {Boolean} [forceDraw=0]
 *  @memberof WebGL */
export declare function glCopyToContext(context: any, forceDraw?: any): void;
export declare function glDraw(x: any, y: any, sizeX: any, sizeY: any, angle?: number, uv0X?: number, uv0Y?: number, uv1X?: number, uv1Y?: number, rgba?: number, rgbaAdditive?: number): void;
export declare const gl_ONE = 1, gl_TRIANGLES = 4, gl_SRC_ALPHA = 770, gl_ONE_MINUS_SRC_ALPHA = 771, gl_BLEND = 3042, gl_TEXTURE_2D = 3553, gl_UNSIGNED_BYTE = 5121, gl_FLOAT = 5126, gl_RGBA = 6408, gl_NEAREST = 9728, gl_LINEAR = 9729, gl_TEXTURE_MAG_FILTER = 10240, gl_TEXTURE_MIN_FILTER = 10241, gl_TEXTURE_WRAP_S = 10242, gl_TEXTURE_WRAP_T = 10243, gl_COLOR_BUFFER_BIT = 16384, gl_CLAMP_TO_EDGE = 33071, gl_ARRAY_BUFFER = 34962, gl_DYNAMIC_DRAW = 35048, gl_FRAGMENT_SHADER = 35632, gl_VERTEX_SHADER = 35633, gl_COMPILE_STATUS = 35713, gl_LINK_STATUS = 35714, gl_VERTICES_PER_QUAD = 6, gl_INDICIES_PER_VERT = 9, gl_MAX_BATCH: number, gl_VERTEX_BYTE_STRIDE: number;