import { mat4 } from './mat4';
import { quat } from './quat';
/**
 * Represents 4D vector
 * @category Types
 */
export type vec4 = readonly [x: number, y: number, z: number, w: number];
/**
 * Functions for {@link vec4}, a 4D vector.
 * @category Modules
 */
export declare namespace vec4 {
    /**
     * Mutable version of {@link vec4}
     * @category Types
     */
    type Mutable = [x: number, y: number, z: number, w: number];
    /**
     * Creates a new vector from given elements
     * @category Generators
     */
    function of(x: number, y?: number, z?: number, w?: number): vec4;
    /**
     * Creates a mutable clone of given vec4
     * @category Generators
     */
    function clone(a: vec4): Mutable;
    /**
     * @category Constants
     */
    const zero: vec4;
    /**
     * @category Constants
     */
    const one: vec4;
    /**
     * An unit vector pointing towards positive X. Same as `[1, 0, 0, 0]`
     * @category Constants
     */
    const unitX: vec4;
    /**
     * An unit vector pointing towards positive Y. Same as `[0, 1, 0, 0]`
     * @category Constants
     */
    const unitY: vec4;
    /**
     * An unit vector pointing towards positive Z. Same as `[0, 0, 1, 0]`
     * @category Constants
     */
    const unitZ: vec4;
    /**
     * An unit vector pointing towards positive W. Same as `[0, 0, 0, 1]`
     * @category Constants
     */
    const unitW: vec4;
    /**
     * Adds given vec4's
     */
    function add(...vs: (vec4 | number)[]): vec4;
    /**
     * Subtracts given vec4's. When the argument is a single vector, it negates it. Otherwise, it subtracts from left to right.
     *
     * @shorthands
     * - {@link sub}
     */
    function subtract(...vs: (vec4 | number)[]): vec4;
    /**
     * Alias for {@link subtract}
     */
    const sub: typeof subtract;
    /**
     * Subtracts a from b
     */
    function delta(a: vec4 | number, b: vec4 | number): vec4;
    /**
     * Multiplies given vec4's
     * @shorthands
     * - {@link mul}
     */
    function multiply(...vs: (vec4 | number)[]): vec4;
    /**
     * Alias for {@link multiply}
     */
    const mul: typeof multiply;
    /**
     * Divides given vec4's
     *
     * @shorthands
     * - {@link div}
     */
    function divide(...vs: (vec4 | number)[]): vec4;
    /**
     * Alias for {@link divide}
     */
    const div: typeof divide;
    /**
     * Returns the absolute value of each component of a vec4
     */
    function abs(v: vec4): vec4;
    /**
     * Symmetric round the components of a vec4
     */
    function round(a: vec4): vec4;
    /**
     * Applies Math.ceil to each component of a vec4
     */
    function ceil(a: vec4): vec4;
    /**
     * Applies Math.floor to each component of a vec4
     */
    function floor(a: vec4): vec4;
    /**
     * Applies Math.sign to each component of a vec4
     */
    function sign(v: vec4): vec4;
    /**
     * Removes the fractional part
     * @see https://www.sidefx.com/docs/houdini/vex/functions/trunc.html
     */
    function trunc(v: vec4): vec4;
    /**
     * Computes the fractional part of the argument
     * @see https://registry.khronos.org/OpenGL-Refpages/gl4/html/fract.xhtml
     */
    function fract(a: vec4): vec4;
    /**
     * Compute value of one parameter modulo another. This is computed as x - y * floor(x/y). Unlike JavaScript's `%` operator, the sign of result always matches to `b`.
     * @see https://thebookofshaders.com/glossary/?search=mod
     */
    function mod(a: vec4, b: vec4 | number): vec4;
    /**
     * Quantize a vec4 to a given step and offset. If the step is 0, the value is returned unchanged.
     * @param v The value to quantize
     * @param step The step size
     * @param offset The offset
     * @returns The quantized value
     */
    function quantize(v: vec4, step: vec4 | number, offset?: vec4 | number): vec4;
    /**
     * Returns the minimum of given vec4's
     */
    function min(...vs: (vec4 | number)[]): vec4;
    /**
     * Returns the maximum of given vec4's
     */
    function max(...vs: (vec4 | number)[]): vec4;
    /**
     * Constrain a value to lie between two further values
     * @see https://thebookofshaders.com/glossary/?search=clamp
     * @param v the value to constrain
     * @param min the lower end of the range into which to constrain `v`
     * @param max the upper end of the range into which to constrain `v`
     */
    function clamp(a: vec4, min: vec4 | number, max: vec4 | number): vec4;
    /**
     * Clamps each component to [0, 1]. Equivalent to {@link saturate}.
     */
    function clamp01(v: vec4): vec4;
    /**
     * Clamps each component to [-1, 1]
     */
    function clamp11(v: vec4): vec4;
    /**
     * Scales a vec4 by a scalar number
     *
     * @param a the vector to scale
     * @param s amount to scale the vector by
     */
    function scale(a: vec4, s: number): vec4;
    /**
     * Returns the average value of the input(s)
     * @see  https://www.sidefx.com/docs/houdini/vex/functions/avg.html
     *
     * @shorthands
     * - {@link avg}
     */
    function average(...vs: vec4[]): vec4;
    /**
     * Alias for {@link average}
     */
    const avg: typeof average;
    /**
     * Adds given vec4's after scaling the second operand by a scalar value
     * @param scale the amount to scale b by before adding
     */
    function scaleAndAdd(a: vec4, b: vec4, scale: number): vec4;
    /**
     * Calculates the euclidian distance between two vec4's
     */
    function distance(a: vec4, b: vec4): number;
    /**
     * Alias for {@link distance}
     */
    const dist: typeof distance;
    /**
     * Calculates the squared euclidian distance between two vec4's
     *
     * @shorthands
     * - {@link sqrDist}
     */
    function squaredDistance(a: vec4, b: vec4): number;
    /**
     * Alias for {@link squaredDistance}
     */
    const sqrDist: typeof squaredDistance;
    /**
     * Returns the absolute difference between corresponding components of two vec4's
     *
     * @shorthands
     * - {@link diff}
     */
    function difference(a: vec4, b: vec4): vec4;
    /**
     * Alias for {@link vec4.difference}
     * @category Shorthands
     */
    const diff: typeof difference;
    /**
     * Calculates the length of a vec4
     *
     * @shorthands
     * - {@link len}
     */
    function length(a: vec4): number;
    /**
     * Alias for {@link length}
     */
    const len: typeof length;
    /**
     * Calculates the squared length of a vec4
     *
     * @shorthands
     * - {@link sqrLen}
     */
    function squaredLength(a: vec4): number;
    /**
     * Alias for {@link squaredLength}
     */
    const sqrLen: typeof squaredLength;
    /**
     * Negates the components of a vec4
     * @shorthands
     * - {@link neg}
     */
    function negate(a: vec4): vec4;
    /**
     * Alias for {@link negate}
     */
    const neg: typeof negate;
    /**
     * Returns the inverse of the components of a vec4
     *
     * @shorthands
     * - {@link inv}
     */
    function invert(a: vec4): vec4;
    /**
     * Alias for {@link invert}
     * @category Shorthands
     */
    const inv: typeof invert;
    /**
     * Returns the result of `v` subtracted from {@link one}.
     */
    function oneMinus(v: vec4): vec4;
    /**
     * Takes the value in the range `(omin, omax)` and shifts it to the corresponding value in the new range `(nmin, nmax)`. The function clamps the given value the range `(omin, omax)` before fitting, so the resulting value will be guaranteed to be in the range `(nmin, nmax)`. To avoid clamping use efit instead.
     * @see https://www.sidefx.com/docs/houdini/vex/functions/fit.html
     * @param value
     * @param omin
     * @param omax
     * @param nmin
     * @param nmax
     * @returns
     */
    function fit(value: vec4, omin: vec4, omax: vec4, nmin: vec4, nmax: vec4): vec4;
    /**
     * Takes the value in the range `(omin, omax)` and shifts it to the corresponding value in the new range `(nmin, nmax)`. Unlike `fit`, this function does not clamp values to the given range. If `omin` and `omax` are the same, the function returns the average of `nmin` and `nmax`.
     * @see https://www.sidefx.com/docs/houdini/vex/functions/fit.html
     * @param value
     * @param omin
     * @param omax
     * @param nmin
     * @param nmax
     * @returns
     */
    function efit(value: vec4, omin: vec4, omax: vec4, nmin: vec4, nmax: vec4): vec4;
    /**
     * Takes the value in the range `(0, 1)` and shifts it to the corresponding value in the new range `(nmin, nmax)`.
     * @see https://www.sidefx.com/docs/houdini/vex/functions/fit01.html
     */
    function fit01(value: vec4, nmin: vec4, nmax: vec4): vec4;
    /**
     * Takes the value in the range `(-1, 1)` and shifts it to the corresponding value in the new range `(nmin, nmax)`.
     * @see https://www.sidefx.com/docs/houdini/vex/functions/fit11.html
     */
    function fit11(value: vec4, nmin: vec4, nmax: vec4): vec4;
    /**
     * Normalize a vec4
     */
    function normalize(a: vec4): vec4;
    /**
     * Calculates the dot product of two vec4's
     */
    function dot(a: vec4, b: vec4): number;
    /**
     * Returns the cross-product of three vectors in a 4-dimensional space
     */
    function cross(u: vec4, v: vec4, w: vec4): vec4;
    /**
     * Linearly interpolate between two vec4's. Same as GLSL's built-in `mix` function.
     * @see https://registry.khronos.org/OpenGL-Refpages/gl4/html/mix.xhtml
     *
     * @shorthands
     * - {@link mix}
     */
    function lerp(a: vec4, b: vec4, t: vec4 | number): vec4;
    /**
     * Alias for {@link lerp}
     * @see https://registry.khronos.org/OpenGL-Refpages/gl4/html/mix.xhtml
     */
    const mix: typeof lerp;
    /**
     * Returns the amount to mix `min` and `max` to generate the input value `t`. This is the inverse of the `lerp` function. If `min` and `max` are equal, the mixing value is `0.5`.
     * @see https://docs.unity3d.com/Packages/com.unity.shadergraph@6.9/manual/Inverse-Lerp-Node.html
     * @see https://www.sidefx.com/docs/houdini/vex/functions/invlerp.html
     *
     * @shorthands
     * - {@link invlerp}
     */
    function inverseLerp(a: vec4, b: vec4, t: vec4): vec4;
    /**
     * Alias for {@link inverseSqrt}
     * @category Shorthands
     */
    const invsqrt: typeof inverseSqrt;
    /**
     * Alias for {@link inverseLerp}
     */
    const invlerp: typeof inverseLerp;
    /**
     * Transforms the vec4 with a mat4.
     */
    function transformMat4(a: vec4, m: mat4): vec4;
    /**
     * Transforms the vec4 with a quat
     */
    function transformQuat(a: vec4, q: quat): vec4;
    /**
     * Transforms a vec4 with a matrix or quaternion, automatically choosing the appropriate transformation function
     * @param p The vector to transform
     * @param m The transformation (mat4 or quat)
     * @returns The transformed vector
     *
     * @shorthands
     * - {@link xform}
     */
    function transform(p: vec4, m: mat4 | quat): vec4;
    /**
     * Alias for {@link vec4.transform}
     * @category Shorthands
     */
    const xform: typeof transform;
    /**
     * Apply a step function by comparing two values
     * @see https://registry.khronos.org/OpenGL-Refpages/gl4/html/step.xhtml
     * @param edge The location of the edge of the step function.
     * @param x The value to be used to generate the step function.
     * @returns
     */
    function step(edge: vec4 | number, v: vec4 | number): vec4;
    /**
     * Perform Hermite interpolation between two values.
     * @see https://registry.khronos.org/OpenGL-Refpages/gl4/html/smoothstep.xhtml
     * @param edge0 Lower edge of the Hermite function.
     * @param edge1 Upper edge of the Hermite function.
     * @param x  Source value for interpolation.
     * @returns
     */
    function smoothstep(edge0: vec4 | number, edge1: vec4 | number, x: vec4): vec4;
    /**
     * Converts the components of a vec4 from radians to degrees
     * @param rad The input vec4 in radians
     * @returns The degrees equivalent of the input
     *
     * @shorthands
     * - {@link deg}
     */
    function degrees(rad: vec4): vec4;
    /**
     * Alias for {@link degrees}
     * @category Shorthands
     */
    const deg: typeof degrees;
    /**
     * Converts the components of a vec4 from degrees to radians
     * @param deg The input vec4 in degrees
     * @returns The radians equivalent of the input
     *
     * @shorthands
     * - {@link rad}
     */
    function radians(deg: vec4): vec4;
    /**
     * Alias for {@link radians}
     * @category Shorthands
     */
    const rad: typeof radians;
    /**
     * Returns the sine of each component, which are angles in degrees
     */
    function sin(deg: vec4): vec4;
    /**
     * Returns the cosine of each component, which are angles in degrees
     */
    function cos(deg: vec4): vec4;
    /**
     * Returns the tangent of each component, which are angles in degrees
     */
    function tan(deg: vec4): vec4;
    /**
     * Returns the arcsine of each component, in degrees
     */
    function asin(v: vec4): vec4;
    /**
     * Returns the arc cosine of each component, in degrees
     */
    function acos(v: vec4): vec4;
    /**
     * Returns the arc-tangent of the parameters.  If `x` is not provided, `y` is regarded as a value of `y/x`.
     * @param y the values of the y-coordinate
     * @param x the values of the x-coordinate
     * @returns the angle in degrees
     * @see https://thebookofshaders.com/glossary/?search=atan
     * 	 */
    function atan(y: vec4, x?: vec4): vec4;
    /**
     * Returns the arc-tangent of the parameters.
     * @param y the values of the y-coordinate
     * @param x the values of the x-coordinate
     * @returns the angle in degrees
     * @see https://thebookofshaders.com/glossary/?search=atan
     * 	 */
    function atan2(y: vec4, x: vec4): vec4;
    /**
     * Returns the base to the exponent power, component-wise
     */
    function pow(a: vec4, b: vec4 | number): vec4;
    /**
     * Returns e raised to the power of each component
     */
    function exp(v: vec4): vec4;
    /**
     * Returns the natural logarithm of each component
     */
    function log(v: vec4): vec4;
    /**
     * Returns 2 raised to the power of the parameter
     * @param v the value of the power to which 2 will be raised
     */
    function exp2(v: vec4): vec4;
    /**
     * Returns the base-2 logarithm of each component
     */
    function log2(v: vec4): vec4;
    /**
     * Returns the square root of each component
     */
    function sqrt(v: vec4): vec4;
    /**
     * Returns the inverse of the square root of the parameter
     * @param v the value of which to take the inverse of the square root
     * @see https://thebookofshaders.com/glossary/?search=inversesqrt
     */
    function inverseSqrt(v: vec4): vec4;
    /**
     * Returns the hyperbolic sine of each component
     */
    function sinh(v: vec4): vec4;
    /**
     * Returns the hyperbolic cosine of each component
     */
    function cosh(v: vec4): vec4;
    /**
     * Returns the hyperbolic tangent of each component
     */
    function tanh(v: vec4): vec4;
    /**
     * Returns the inverse hyperbolic sine of each component
     */
    function asinh(v: vec4): vec4;
    /**
     * Returns the inverse hyperbolic cosine of each component
     */
    function acosh(v: vec4): vec4;
    /**
     * Returns the inverse hyperbolic tangent of each component
     */
    function atanh(v: vec4): vec4;
    /**
     * Clamps each component to [0, 1]. Equivalent to HLSL's `saturate`.
     */
    function saturate(v: vec4): vec4;
    /**
     * Returns the sum of all components of a vector.
     * Equivalent to GLM's `glm::compAdd`.
     */
    function compAdd(v: vec4): number;
    /**
     * Returns the product of all components of a vector.
     * Equivalent to GLM's `glm::compMul`.
     */
    function compMul(v: vec4): number;
    /**
     * Returns whether or not the vectors have exactly the same elements in the same position (when compared with `===`)
     *
     * @shorthands
     * - {@link eq}
     */
    function exactEquals(a: vec4, b: vec4): boolean;
    /**
     * Alias for {@link exactEquals}
     * @category Shorthands
     */
    const eq: typeof exactEquals;
    /**
     * Returns whether or not the vectors have approximately the same elements in the same position.
     *
     * @shorthands
     * - {@link approx}
     * - {@link equals}
     */
    function approxEquals(a: vec4, b: vec4): boolean;
    /**
     * Alias for {@link approxEquals}
     * @category Shorthands
     */
    const approx: typeof approxEquals;
    /**
     * Alias for {@link approxEquals}. This is provided for compatibility with gl-matrix.
     * @category Shorthands
     * @deprecated Use {@link approxEquals} instead
     */
    const equals: typeof approxEquals;
    /**
     * Returns the string representation of a vec4
     * @param v vector to represent as a string
     * @param fractionDigits number of digits to appear after the decimal point
     */
    const toString: (v: vec4, fractionDigits?: number) => string;
}
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