/**
 * A 4x4 matrix.
 *
 * @category Math
 */
export class Mat4 {
    static _getPerspectiveHalfSize(halfSize: any, fov: any, aspect: any, znear: any, fovIsHorizontal: any): void;
    /**
     * A constant matrix set to the identity.
     *
     * @type {Mat4}
     * @readonly
     */
    static readonly IDENTITY: Mat4;
    /**
     * A constant matrix with all elements set to 0.
     *
     * @type {Mat4}
     * @readonly
     */
    static readonly ZERO: Mat4;
    /**
     * Matrix elements in the form of a flat array.
     *
     * @type {Float32Array}
     */
    data: Float32Array;
    /**
     * Adds the specified 4x4 matrices together and stores the result in the current instance.
     *
     * @param {Mat4} lhs - The 4x4 matrix used as the first operand of the addition.
     * @param {Mat4} rhs - The 4x4 matrix used as the second operand of the addition.
     * @returns {Mat4} Self for chaining.
     * @example
     * const m = new pc.Mat4();
     *
     * m.add2(pc.Mat4.IDENTITY, pc.Mat4.ONE);
     *
     * console.log("The result of the addition is: " + m.toString());
     */
    add2(lhs: Mat4, rhs: Mat4): Mat4;
    /**
     * Adds the specified 4x4 matrix to the current instance.
     *
     * @param {Mat4} rhs - The 4x4 matrix used as the second operand of the addition.
     * @returns {Mat4} Self for chaining.
     * @example
     * const m = new pc.Mat4();
     *
     * m.add(pc.Mat4.ONE);
     *
     * console.log("The result of the addition is: " + m.toString());
     */
    add(rhs: Mat4): Mat4;
    /**
     * Creates a duplicate of the specified matrix.
     *
     * @returns {this} A duplicate matrix.
     * @example
     * const src = new pc.Mat4().setFromEulerAngles(10, 20, 30);
     * const dst = src.clone();
     * console.log("The two matrices are " + (src.equals(dst) ? "equal" : "different"));
     */
    clone(): this;
    /**
     * Copies the contents of a source 4x4 matrix to a destination 4x4 matrix.
     *
     * @param {Mat4} rhs - A 4x4 matrix to be copied.
     * @returns {Mat4} Self for chaining.
     * @example
     * const src = new pc.Mat4().setFromEulerAngles(10, 20, 30);
     * const dst = new pc.Mat4();
     * dst.copy(src);
     * console.log("The two matrices are " + (src.equals(dst) ? "equal" : "different"));
     */
    copy(rhs: Mat4): Mat4;
    /**
     * Reports whether two matrices are equal.
     *
     * @param {Mat4} rhs - The other matrix.
     * @returns {boolean} True if the matrices are equal and false otherwise.
     * @example
     * const a = new pc.Mat4().setFromEulerAngles(10, 20, 30);
     * const b = new pc.Mat4();
     * console.log("The two matrices are " + (a.equals(b) ? "equal" : "different"));
     */
    equals(rhs: Mat4): boolean;
    /**
     * Reports whether the specified matrix is the identity matrix.
     *
     * @returns {boolean} True if the matrix is identity and false otherwise.
     * @example
     * const m = new pc.Mat4();
     * console.log("The matrix is " + (m.isIdentity() ? "identity" : "not identity"));
     */
    isIdentity(): boolean;
    /**
     * Multiplies the specified 4x4 matrices together and stores the result in the current
     * instance.
     *
     * @param {Mat4} lhs - The 4x4 matrix used as the first multiplicand of the operation.
     * @param {Mat4} rhs - The 4x4 matrix used as the second multiplicand of the operation.
     * @returns {Mat4} Self for chaining.
     * @example
     * const a = new pc.Mat4().setFromEulerAngles(10, 20, 30);
     * const b = new pc.Mat4().setFromAxisAngle(pc.Vec3.UP, 180);
     * const r = new pc.Mat4();
     *
     * // r = a * b
     * r.mul2(a, b);
     *
     * console.log("The result of the multiplication is: " + r.toString());
     */
    mul2(lhs: Mat4, rhs: Mat4): Mat4;
    /**
     * Multiplies the specified 4x4 matrices together and stores the result in the current
     * instance. This function assumes the matrices are affine transformation matrices, where the
     * upper left 3x3 elements are a rotation matrix, and the bottom left 3 elements are
     * translation. The rightmost column is assumed to be [0, 0, 0, 1]. The parameters are not
     * verified to be in the expected format. This function is faster than general
     * {@link Mat4#mul2}.
     *
     * @param {Mat4} lhs - The affine transformation 4x4 matrix used as the first multiplicand of
     * the operation.
     * @param {Mat4} rhs - The affine transformation 4x4 matrix used as the second multiplicand of
     * the operation.
     * @returns {Mat4} Self for chaining.
     */
    mulAffine2(lhs: Mat4, rhs: Mat4): Mat4;
    /**
     * Multiplies the current instance by the specified 4x4 matrix.
     *
     * @param {Mat4} rhs - The 4x4 matrix used as the second multiplicand of the operation.
     * @returns {Mat4} Self for chaining.
     * @example
     * const a = new pc.Mat4().setFromEulerAngles(10, 20, 30);
     * const b = new pc.Mat4().setFromAxisAngle(pc.Vec3.UP, 180);
     *
     * // a = a * b
     * a.mul(b);
     *
     * console.log("The result of the multiplication is: " + a.toString());
     */
    mul(rhs: Mat4): Mat4;
    /**
     * Transforms a 3-dimensional point by a 4x4 matrix.
     *
     * @param {Vec3} vec - The 3-dimensional point to be transformed.
     * @param {Vec3} [res] - An optional 3-dimensional point to receive the result of the
     * transformation.
     * @returns {Vec3} The input point v transformed by the current instance.
     * @example
     * // Create a 3-dimensional point
     * const v = new pc.Vec3(1, 2, 3);
     *
     * // Create a 4x4 rotation matrix
     * const m = new pc.Mat4().setFromEulerAngles(10, 20, 30);
     *
     * const tv = m.transformPoint(v);
     */
    transformPoint(vec: Vec3, res?: Vec3): Vec3;
    /**
     * Transforms a 3-dimensional vector by a 4x4 matrix.
     *
     * @param {Vec3} vec - The 3-dimensional vector to be transformed.
     * @param {Vec3} [res] - An optional 3-dimensional vector to receive the result of the
     * transformation.
     * @returns {Vec3} The input vector v transformed by the current instance.
     * @example
     * // Create a 3-dimensional vector
     * const v = new pc.Vec3(1, 2, 3);
     *
     * // Create a 4x4 rotation matrix
     * const m = new pc.Mat4().setFromEulerAngles(10, 20, 30);
     *
     * const tv = m.transformVector(v);
     */
    transformVector(vec: Vec3, res?: Vec3): Vec3;
    /**
     * Transforms a 4-dimensional vector by a 4x4 matrix.
     *
     * @param {Vec4} vec - The 4-dimensional vector to be transformed.
     * @param {Vec4} [res] - An optional 4-dimensional vector to receive the result of the
     * transformation.
     * @returns {Vec4} The input vector v transformed by the current instance.
     * @example
     * // Create an input 4-dimensional vector
     * const v = new pc.Vec4(1, 2, 3, 4);
     *
     * // Create an output 4-dimensional vector
     * const result = new pc.Vec4();
     *
     * // Create a 4x4 rotation matrix
     * const m = new pc.Mat4().setFromEulerAngles(10, 20, 30);
     *
     * m.transformVec4(v, result);
     */
    transformVec4(vec: Vec4, res?: Vec4): Vec4;
    /**
     * Sets the specified matrix to a viewing matrix derived from an eye point, a target point and
     * an up vector. The matrix maps the target point to the negative z-axis and the eye point to
     * the origin, so that when you use a typical projection matrix, the center of the scene maps
     * to the center of the viewport. Similarly, the direction described by the up vector projected
     * onto the viewing plane is mapped to the positive y-axis so that it points upward in the
     * viewport. The up vector must not be parallel to the line of sight from the eye to the
     * reference point.
     *
     * @param {Vec3} position - 3-d vector holding view position.
     * @param {Vec3} target - 3-d vector holding reference point.
     * @param {Vec3} up - 3-d vector holding the up direction.
     * @returns {Mat4} Self for chaining.
     * @example
     * const position = new pc.Vec3(10, 10, 10);
     * const target = new pc.Vec3(0, 0, 0);
     * const up = new pc.Vec3(0, 1, 0);
     * const m = new pc.Mat4().setLookAt(position, target, up);
     */
    setLookAt(position: Vec3, target: Vec3, up: Vec3): Mat4;
    /**
     * Sets the specified matrix to a perspective projection matrix. The function's parameters
     * define the shape of a frustum.
     *
     * @param {number} left - The x-coordinate for the left edge of the camera's projection plane
     * in eye space.
     * @param {number} right - The x-coordinate for the right edge of the camera's projection plane
     * in eye space.
     * @param {number} bottom - The y-coordinate for the bottom edge of the camera's projection
     * plane in eye space.
     * @param {number} top - The y-coordinate for the top edge of the camera's projection plane in
     * eye space.
     * @param {number} znear - The near clip plane in eye coordinates.
     * @param {number} zfar - The far clip plane in eye coordinates.
     * @returns {Mat4} Self for chaining.
     * @example
     * // Create a 4x4 perspective projection matrix
     * const f = pc.Mat4().setFrustum(-2, 2, -1, 1, 1, 1000);
     * @ignore
     */
    setFrustum(left: number, right: number, bottom: number, top: number, znear: number, zfar: number): Mat4;
    /**
     * Sets the specified matrix to a perspective projection matrix. The function's parameters
     * define the shape of a frustum.
     *
     * @param {number} fov - The frustum's field of view in degrees. The fovIsHorizontal parameter
     * controls whether this is a vertical or horizontal field of view. By default, it's a vertical
     * field of view.
     * @param {number} aspect - The aspect ratio of the frustum's projection plane
     * (width / height).
     * @param {number} znear - The near clip plane in eye coordinates.
     * @param {number} zfar - The far clip plane in eye coordinates.
     * @param {boolean} [fovIsHorizontal] - Set to true to treat the fov as horizontal (x-axis) and
     * false for vertical (y-axis). Defaults to false.
     * @returns {Mat4} Self for chaining.
     * @example
     * // Create a 4x4 perspective projection matrix
     * const persp = pc.Mat4().setPerspective(45, 16 / 9, 1, 1000);
     */
    setPerspective(fov: number, aspect: number, znear: number, zfar: number, fovIsHorizontal?: boolean): Mat4;
    /**
     * Sets the specified matrix to an orthographic projection matrix. The function's parameters
     * define the shape of a cuboid-shaped frustum.
     *
     * @param {number} left - The x-coordinate for the left edge of the camera's projection plane
     * in eye space.
     * @param {number} right - The x-coordinate for the right edge of the camera's projection plane
     * in eye space.
     * @param {number} bottom - The y-coordinate for the bottom edge of the camera's projection
     * plane in eye space.
     * @param {number} top - The y-coordinate for the top edge of the camera's projection plane in
     * eye space.
     * @param {number} near - The near clip plane in eye coordinates.
     * @param {number} far - The far clip plane in eye coordinates.
     * @returns {Mat4} Self for chaining.
     * @example
     * // Create a 4x4 orthographic projection matrix
     * const ortho = pc.Mat4().ortho(-2, 2, -2, 2, 1, 1000);
     */
    setOrtho(left: number, right: number, bottom: number, top: number, near: number, far: number): Mat4;
    /**
     * Sets the specified matrix to a rotation matrix equivalent to a rotation around an axis. The
     * axis must be normalized (unit length) and the angle must be specified in degrees.
     *
     * @param {Vec3} axis - The normalized axis vector around which to rotate.
     * @param {number} angle - The angle of rotation in degrees.
     * @returns {Mat4} Self for chaining.
     * @example
     * // Create a 4x4 rotation matrix
     * const rm = new pc.Mat4().setFromAxisAngle(pc.Vec3.UP, 90);
     */
    setFromAxisAngle(axis: Vec3, angle: number): Mat4;
    /**
     * Sets the specified matrix to a translation matrix.
     *
     * @param {number} x - The x-component of the translation.
     * @param {number} y - The y-component of the translation.
     * @param {number} z - The z-component of the translation.
     * @returns {Mat4} Self for chaining.
     * @example
     * // Create a 4x4 translation matrix
     * const tm = new pc.Mat4().setTranslate(10, 10, 10);
     * @ignore
     */
    setTranslate(x: number, y: number, z: number): Mat4;
    /**
     * Sets the specified matrix to a scale matrix.
     *
     * @param {number} x - The x-component of the scale.
     * @param {number} y - The y-component of the scale.
     * @param {number} z - The z-component of the scale.
     * @returns {Mat4} Self for chaining.
     * @example
     * // Create a 4x4 scale matrix
     * const sm = new pc.Mat4().setScale(10, 10, 10);
     * @ignore
     */
    setScale(x: number, y: number, z: number): Mat4;
    /**
     * Sets the specified matrix to a matrix transforming a normalized view volume (in range of
     * -1 .. 1) to their position inside a viewport (in range of 0 .. 1). This encapsulates a
     * scaling to the size of the viewport and a translation to the position of the viewport.
     *
     * @param {number} x - The x-component of the position of the viewport (in 0..1 range).
     * @param {number} y - The y-component of the position of the viewport (in 0..1 range).
     * @param {number} width - The width of the viewport (in 0..1 range).
     * @param {number} height - The height of the viewport (in 0..1 range).
     * @returns {Mat4} Self for chaining.
     * @example
     * // Create a 4x4 viewport matrix which scales normalized view volume to full texture viewport
     * const vm = new pc.Mat4().setViewport(0, 0, 1, 1);
     * @ignore
     */
    setViewport(x: number, y: number, width: number, height: number): Mat4;
    /**
     * Sets the matrix to a reflection matrix, which can be used as a mirror transformation by the
     * plane.
     *
     * @param {Vec3} normal - The normal of the plane to reflect by.
     * @param {number} distance - The distance of plane to reflect by.
     * @returns {Mat4} Self for chaining.
     */
    setReflection(normal: Vec3, distance: number): Mat4;
    /**
     * Sets the matrix to the inverse of a source matrix.
     *
     * @param {Mat4} [src] - The matrix to invert. If not set, the matrix is inverted in-place.
     * @returns {Mat4} Self for chaining.
     * @example
     * // Create a 4x4 rotation matrix of 180 degrees around the y-axis
     * const rot = new pc.Mat4().setFromAxisAngle(pc.Vec3.UP, 180);
     *
     * // Invert in place
     * rot.invert();
     */
    invert(src?: Mat4): Mat4;
    /**
     * Sets matrix data from an array.
     *
     * @param {number[]} src - Source array. Must have 16 values.
     * @returns {Mat4} Self for chaining.
     */
    set(src: number[]): Mat4;
    /**
     * Sets the specified matrix to the identity matrix.
     *
     * @returns {Mat4} Self for chaining.
     * @example
     * m.setIdentity();
     * console.log("The matrix is " + (m.isIdentity() ? "identity" : "not identity"));
     */
    setIdentity(): Mat4;
    /**
     * Sets the specified matrix to the concatenation of a translation, a quaternion rotation and a
     * scale.
     *
     * @param {Vec3} t - A 3-d vector translation.
     * @param {Quat} r - A quaternion rotation.
     * @param {Vec3} s - A 3-d vector scale.
     * @returns {Mat4} Self for chaining.
     * @example
     * const t = new pc.Vec3(10, 20, 30);
     * const r = new pc.Quat();
     * const s = new pc.Vec3(2, 2, 2);
     *
     * const m = new pc.Mat4();
     * m.setTRS(t, r, s);
     */
    setTRS(t: Vec3, r: Quat, s: Vec3): Mat4;
    /**
     * Sets the matrix to the transpose of a source matrix.
     *
     * @param {Mat4} [src] - The matrix to transpose. If not set, the matrix is transposed in-place.
     * @returns {Mat4} Self for chaining.
     * @example
     * const m = new pc.Mat4();
     *
     * // Transpose in place
     * m.transpose();
     */
    transpose(src?: Mat4): Mat4;
    /**
     * Extracts the translational component from the specified 4x4 matrix.
     *
     * @param {Vec3} [t] - The vector to receive the translation of the matrix.
     * @returns {Vec3} The translation of the specified 4x4 matrix.
     * @example
     * // Create a 4x4 matrix
     * const m = new pc.Mat4();
     *
     * // Query the translation component
     * const t = new pc.Vec3();
     * m.getTranslation(t);
     */
    getTranslation(t?: Vec3): Vec3;
    /**
     * Extracts the x-axis from the specified 4x4 matrix.
     *
     * @param {Vec3} [x] - The vector to receive the x axis of the matrix.
     * @returns {Vec3} The x-axis of the specified 4x4 matrix.
     * @example
     * // Create a 4x4 matrix
     * const m = new pc.Mat4();
     *
     * // Query the x-axis component
     * const x = new pc.Vec3();
     * m.getX(x);
     */
    getX(x?: Vec3): Vec3;
    /**
     * Extracts the y-axis from the specified 4x4 matrix.
     *
     * @param {Vec3} [y] - The vector to receive the y axis of the matrix.
     * @returns {Vec3} The y-axis of the specified 4x4 matrix.
     * @example
     * // Create a 4x4 matrix
     * const m = new pc.Mat4();
     *
     * // Query the y-axis component
     * const y = new pc.Vec3();
     * m.getY(y);
     */
    getY(y?: Vec3): Vec3;
    /**
     * Extracts the z-axis from the specified 4x4 matrix.
     *
     * @param {Vec3} [z] - The vector to receive the z axis of the matrix.
     * @returns {Vec3} The z-axis of the specified 4x4 matrix.
     * @example
     * // Create a 4x4 matrix
     * const m = new pc.Mat4();
     *
     * // Query the z-axis component
     * const z = new pc.Vec3();
     * m.getZ(z);
     */
    getZ(z?: Vec3): Vec3;
    /**
     * Extracts the scale component from the specified 4x4 matrix.
     *
     * @param {Vec3} [scale] - Vector to receive the scale.
     * @returns {Vec3} The scale in X, Y and Z of the specified 4x4 matrix.
     * @example
     * // Query the scale component
     * const scale = m.getScale();
     */
    getScale(scale?: Vec3): Vec3;
    /**
     * -1 if the the matrix has an odd number of negative scales (mirrored); 1 otherwise.
     *
     * @type {number}
     * @ignore
     */
    get scaleSign(): number;
    /**
     * Sets the specified matrix to a rotation matrix defined by Euler angles. The Euler angles are
     * specified in XYZ order and in degrees.
     *
     * @param {number} ex - Angle to rotate around X axis in degrees.
     * @param {number} ey - Angle to rotate around Y axis in degrees.
     * @param {number} ez - Angle to rotate around Z axis in degrees.
     * @returns {Mat4} Self for chaining.
     * @example
     * const m = new pc.Mat4();
     * m.setFromEulerAngles(45, 90, 180);
     */
    setFromEulerAngles(ex: number, ey: number, ez: number): Mat4;
    /**
     * Extracts the Euler angles equivalent to the rotational portion of the specified matrix. The
     * returned Euler angles are in XYZ order an in degrees.
     *
     * @param {Vec3} [eulers] - A 3-d vector to receive the Euler angles.
     * @returns {Vec3} A 3-d vector containing the Euler angles.
     * @example
     * // Create a 4x4 rotation matrix of 45 degrees around the y-axis
     * const m = new pc.Mat4().setFromAxisAngle(pc.Vec3.UP, 45);
     *
     * const eulers = m.getEulerAngles();
     */
    getEulerAngles(eulers?: Vec3): Vec3;
    /**
     * Converts the specified matrix to string form.
     *
     * @returns {string} The matrix in string form.
     * @example
     * const m = new pc.Mat4();
     * // Outputs [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]
     * console.log(m.toString());
     */
    toString(): string;
}
import { Vec3 } from './vec3.js';
import { Vec4 } from './vec4.js';
import type { Quat } from './quat.js';