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# glsl-util
utility functions of glsl.
these functions are dependent by [glslify](https://github.com/glslify/glslify).
Private GLSL utility functions created by @ykob
These functions are dependent on [glslify](https://github.com/glslify/glslify).
## install
## Install
```
yarn add @ykob/glsl-util
```
## usage
## Usage
### `convertHsvToRgb(vec3 hsv)`
convert HSV to RGB.
Convert HSV to RGB.
http://lolengine.net/blog/2013/07/27/rgb-to-hsv-in-glsl
```
#pragma glslify: convertHsvToRgb = require(glsl-util/src/convertHsvToRgb);
#pragma glslify: convertHsvToRgb = require(@ykob/glsl-util/src/convertHsvToRgb);
```
### `convertRgbToHsv(vec3 rgb)`
convert RGB to HSV.
Convert RGB to HSV.
http://lolengine.net/blog/2013/07/27/rgb-to-hsv-in-glsl
```
#pragma glslify: convertRgbToHsv = require(glsl-util/src/convertRgbToHsv);
#pragma glslify: convertRgbToHsv = require(@ykob/glsl-util/src/convertRgbToHsv);
```
### `random(vec2 p)`
calculate white noise.
Calculate the white noise.
```
#pragma glslify: random = require(glsl-util/src/random);
#pragma glslify: random = require(@ykob/glsl-util/src/random);
```
### `polar(float radian1, float radian2, float radius)`
calculate polar coordinates.
Calculate the polar coordinates.
```
#pragma glslify: polar = require(glsl-util/src/polar);
#pragma glslify: polar = require(@ykob/glsl-util/src/polar);
```
### `gaussianBlur(sampler2D texture, vec2 uv, float radius, vec2 resolution, vec2 direction)`
calculate the Gaussian blur.
Calculate the Gaussian blur.
```
#pragma glslify: gaussianBlur = require(glsl-util/src/gaussianBlur);
#pragma glslify: gaussianBlur = require(@ykob/glsl-util/src/gaussianBlur);
```
### `lookAt(vec3 base, vec3 p1, vec3 p2, vec3 up)`
rotate a vector in any direction.
Rotate a vector in any direction.
```
#pragma glslify: lookAt = require(glsl-util/src/lookAt);
#pragma glslify: lookAt = require(@ykob/glsl-util/src/lookAt);
```
### `rotateAxisAngle(vec3 p, vec3 axis, float angle)`
rotate a vector by any axis and angle.
Rotate a vector with axis and angle.
```
#pragma glslify: rotateAxisAngle = require(glsl-util/src/rotateAxisAngle);
#pragma glslify: rotateAxisAngle = require(@ykob/glsl-util/src/rotateAxisAngle);
```