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20 changes: 20 additions & 0 deletions catalog-info.yaml
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apiVersion: backstage.io/v1beta1
kind: Component
metadata:
name: react-shader-canvas
namespace: economist-impact
annotations:
github.com/project-slug: signal-noise/react-shader-canvas
# the circleCI project, mirrors github repo in this case:
circleci.com/project-slug: github/signal-noise/react-shader-canvas
# GUID - see https://docs.newrelic.com/docs/query-your-data/explore-query-data/dashboards/manage-your-dashboard/
newrelic.com/dashboard-guid: MzY1MjgxOXxWSVp8REFTSEJPQVJEfGRhOjE3MDkwOA
newrelic.com/dashboard-guid: MzY1MjgxOXxWSVp8REFTSEJPQVJEfGRhOjE5NTIyNw
description: covid-relative-risk for SignalNoise Economist Impact Project
opsgenie:
domain: https://economist.app.opsgenie.com/teams/dashboard/49177ca8-5e59-4364-af23-c22cc60c026f/main
backstage.io/techdocs-ref: dir:.
spec:
type: website
lifecycle: production
owner: group:economist-impact/signal-noise
104 changes: 104 additions & 0 deletions docs/index.md
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# react-shader-canvas

[![NPM version][npm-image]][npm-url]
[![Actions Status][ci-image]][ci-url]
[![PR Welcome][npm-downloads-image]][npm-downloads-url]

A react component to display and control a WebGL shader.

## Introduction

Sometimes you want a simple way of displaying a WebGL Shader within your React project without a large 3D library like three.js, Alfrid or Babylon.js. This component does exactly that! You can very easily specify the size, shaders and optional [uniforms](https://jameshfisher.com/2017/10/03/webgl-fragment-shader-uniform/) to pass into the shader.

This project is essentially a wrapper around [glslCanvas](https://github.com/patriciogonzalezvivo/glslCanvas/) that allows it to be used within your React projects. Please check out their documentation to see whats happening under the hood.

## Installation

Install this package with `npm`.

```bash
npm i @signal-noise/react-shader-canvas
```

## Usage

Here is the most minimal example...

```JSX
import React from 'react';
import ShaderCanvas from "@signal-noise/react-shader-canvas";

const shader = `
precision mediump float;
void main() {
gl_FragColor = vec4(1, 0, 0, 1);
}
`;

const RedView = () => (
<ShaderCanvas width={320} height={240} fragShader={shader} />
);

```

You can optionally pass in a vertex shader, uniforms and a supersample value.

```JSX
import React from 'react';
import ShaderCanvas from "@signal-noise/react-shader-canvas";

// Using the webpack loader "shader-loader"
import fragShader from "./noise.frag";
import vertShader from "./noise.vert";

const FunkyView = () => {

// Uniforms to pass into the shader
const uniforms = {
u_color_bg: [11, 12, 33],
u_color_noise: [205, 255, 0],
u_noise_amount: 0.5
};

return (
<ShaderCanvas
width={640}
height={480}
fragShader={fragShader}
vertShader={vertShader}
uniforms={uniforms}
superSample={2} // Render twice the display resolution
/>
);
};
```

## API

- `width` : Required - Number - The width in pixels.
- `height` : Required - Number - The height in pixels.
- `fragShader` : Required - String - The fragment shader to use.
- `vertShader` : Optional - String - The vertex shader to use.
- `uniforms` : Optional - Object - An object containing vec2, vec3 and float key value pairs.
- `superSample` : Optional - Number - A value to supersample by, creating a smoother image.

## Notes

### Super Sampling

You have the option of super sampling as a method to antialias the final output. A value of `2` is generally a good idea. This quadruples the processing requirements.

### Retina

The rendered output matches the devices pixel density automatically.

### Mouse

A vec2 uniform `u_mouse` is passed into the shader.

[npm-image]: https://img.shields.io/npm/v/@signal-noise/react-shader-canvas.svg?style=flat-square&logo=react
[npm-url]: https://npmjs.org/package/@signal-noise/react-shader-canvas
[npm-downloads-image]: https://img.shields.io/npm/dm/@signal-noise/react-shader-canvas.svg
[npm-downloads-url]: https://npmcharts.com/compare/@signal-noise/react-shader-canvas?minimal=true
[ci-image]: https://github.com/signal-noise/react-shader-canvas/workflows/node-ci/badge.svg
[ci-url]: https://github.com/signal-noise/react-shader-canvas/actions
5 changes: 5 additions & 0 deletions mkdocs.yml
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docs_dir: docs
nav:
- Main: index.md
plugins:
- techdocs-core