import { Context } from './context';
export type TexImage2DData = GLintptr | HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap | ImageData | ArrayBufferView | undefined;
export type TexImage3DData = GLintptr | HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap | ImageData | ArrayBufferView | undefined;
/**
 * A WebGL 2 facade, simplifying the access to gl functions that are either not available, exposed via extension or
 * supported directly, e.g., in webgl2. All gl features/interfaces handled by this facade are mandatory.
 */
export declare class GL2Facade {
    /**
     * @param context - Wrapped gl context for function resolution.
     */
    constructor(context: Context);
    /**
     * Stores the HALF_FLOAT enum if supported. @see {@link HALF_FLOAT}
     */
    protected _halfFloat: GLenum;
    /**
     * The HALF_FLOAT format enum. Is `undefined` if not supported.
     */
    get HALF_FLOAT(): GLenum;
    /**
     *  For WebGL1 the HALF_FLOAT enum needs to be saved via the extension object.
     */
    protected queryHalfFloatSupport(context: Context): void;
    /**
     * Stores the lowest color attachment identifier.
     */
    protected _colorAttachmentMin: GLenum;
    /**
     * The lowest color attachment identifier format enum.
     */
    get COLOR_ATTACHMENT_MIN(): GLenum;
    /**
     * Stores the highest supported color attachment identifier.
     */
    protected _colorAttachmentMax: GLenum;
    /**
     * Stores all context/backend sepcific color attachment identifier for COLOR_ATTACHMENT# getter.
     */
    protected _colorAttachments: Array<GLenum>;
    /**
     * The lowest color attachment identifier format enum.
     * Is at least `COLOR_ATTACHMENT_MIN`.
     */
    get COLOR_ATTACHMENT_MAX(): GLenum;
    get COLOR_ATTACHMENT0(): GLenum;
    get COLOR_ATTACHMENT1(): GLenum;
    get COLOR_ATTACHMENT2(): GLenum;
    get COLOR_ATTACHMENT3(): GLenum;
    get COLOR_ATTACHMENT4(): GLenum;
    get COLOR_ATTACHMENT5(): GLenum;
    get COLOR_ATTACHMENT6(): GLenum;
    get COLOR_ATTACHMENT7(): GLenum;
    get COLOR_ATTACHMENT8(): GLenum;
    get COLOR_ATTACHMENT9(): GLenum;
    get COLOR_ATTACHMENT10(): GLenum;
    get COLOR_ATTACHMENT11(): GLenum;
    get COLOR_ATTACHMENT12(): GLenum;
    get COLOR_ATTACHMENT13(): GLenum;
    get COLOR_ATTACHMENT14(): GLenum;
    get COLOR_ATTACHMENT15(): GLenum;
    /**
     * Queries the valid range of color attachments and provides an interface for convenience.
     */
    protected queryColorAttachments(context: Context): void;
    /**
     * @link https://developer.mozilla.org/en-US/docs/Web/API/ANGLE_instanced_arrays/drawArraysInstancedANGLE
     */
    drawArraysInstanced: (mode: GLenum, first: GLint, count: GLsizei, instanceCount: GLsizei) => void;
    /**
     * @link https://developer.mozilla.org/en-US/docs/Web/API/ANGLE_instanced_arrays/drawElementsInstancedANGLE
     */
    drawElementsInstanced: (mode: GLenum, count: GLint, type: GLsizei, offset: GLintptr, primcount: GLsizei) => void;
    /**
     * @link https://developer.mozilla.org/en-US/docs/Web/API/ANGLE_instanced_arrays/vertexAttribDivisorANGLE
     */
    vertexAttribDivisor: (index: GLuint, divisor: GLuint) => void;
    /**
     * Evaluate whether or not ANGLE_instanced_arrays is supported (either by extension or in WebGL2 by default) and, if
     * supported, binds the associated functions.
     * @param context - WebGL context to query extension support in
     */
    protected queryInstancedArraySupport(context: Context): void;
    /**
     * Stores the MAX_DRAW_BUFFERS enum if supported. @see {@link MAX_DRAW_BUFFERS}
     */
    protected _maxDrawBuffers: GLenum;
    /**
     * The MAX_DRAW_BUFFERS format enum. Is `undefined` if not supported.
     */
    get MAX_DRAW_BUFFERS(): GLenum;
    /**
     * @link https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_draw_buffers/drawBuffersWEBGL
     */
    drawBuffers: ((buffers: Array<GLenum>) => void) | undefined;
    /**
     * Evaluate whether or not WEBGL_draw_buffers is supported (either by extension or in WebGL2 by default) and, if
     * supported, binds the associated functions.
     * @param context - WebGL context to query extension support in.
     */
    protected queryDrawBuffersSupport(context: Context): void;
    /**
     * @link https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/createVertexArray
     */
    createVertexArray: () => any;
    /**
     * @link https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/createVertexArray
     */
    deleteVertexArray: (arrayObject: any) => void;
    /**
     * @link https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/isVertexArray
     */
    isVertexArray: (arrayObject: any) => GLboolean;
    /**
     * @link https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/bindVertexArray
     */
    bindVertexArray: (arrayObject: any) => void;
    protected queryVertexArrayObjectSupport(context: Context): void;
    /** @see {@link maxUniformVec3Components} */
    protected _maxUniformVec3Components: GLint | undefined;
    /**
     * The maximum number of floats, integers, or booleans that can be in storage for a vertex shader.
     */
    get maxUniformVec3Components(): GLint | undefined;
    /**
     * Query and store the maximum number of floats, integers, or booleans that can be in storage for a vertex shader.
     * @param context - WebGL context to query the value in.
     */
    protected queryMaxUniformVec3Components(context: Context): void;
    /**
     * @link https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/bufferSubData
     */
    bufferSubData: (target: GLenum, dstByteOffset: GLintptr, srcData: ArrayBufferView | ArrayBuffer, srcOffset: GLuint, length: GLuint) => void;
    protected queryBufferSubDataInterface(context: Context): void;
    /**
     * @link https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/texImage2D
     */
    texImage2D: (target: GLenum, level: GLint, internalformat: GLenum, width: GLsizei, height: GLsizei, border: GLint, format: GLenum, type: GLenum, source?: TexImage2DData, offset?: GLintptr) => void;
    /**
     * @link https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/texImage3D
     */
    texImage3D: (target: GLenum, level: GLint, internalformat: GLenum, width: GLsizei, height: GLsizei, depth: GLsizei, border: GLint, format: GLenum, type: GLenum, source?: TexImage3DData, offset?: GLintptr) => void;
    protected queryTexImageInterface(context: Context): void;
}