Introduction

What does it look like?

glre simplifies WebGl2 / WebGPU programming via TypeScript, React, Solid and more

React

import { createRoot } from 'react-dom/client'
import { useGL, vec4, fract, fragCoord, iResolution } from 'glre/react'
const frag = vec4(fract(fragCoord.xy / iResolution), 0, 1)

const App = () => {
        const gl = useGL({ frag })
        return <canvas ref={gl.ref} />
}

createRoot(document.getElementById('root')).render(<App />)

React Native

import { GLView } from 'expo-gl'
import { registerRootComponent } from 'expo'
import { useGL, vec4, fract, fragCoord, iResolution } from 'glre/native'
const frag = vec4(fract(fragCoord.xy / iResolution), 0, 1)

const App = () => {
        const gl = useGL({ frag })
        return <GLView style={{ flex: 1 }} onContextCreate={gl.ref} />
}

registerRootComponent(App)

Solid.js

import { render } from 'solid-js/web'
import { onGL, vec4, fract, fragCoord, iResolution } from 'glre/solid'
const frag = vec4(fract(fragCoord.xy / iResolution), 0, 1)

const App = () => {
        const gl = onGL({ frag })
        return <canvas ref={gl.ref} />
}

render(() => <App />, document.getElementById('root'))

ESM

<script type="module">
        import createGL from 'https://esm.sh/glre'
        import { vec4, fract, fragCoord, iResolution } from 'https://esm.sh/glre'
        const frag = vec4(fract(fragCoord.xy / iResolution), 0, 1)
        function App() {
                const el = document.createElement('canvas')
                createGL({ el, frag }).mount()
                document.body.append(el)
        }
        document.addEventListener('DOMContentLoaded', App)
</script>

Uniforms

WebGL

Live Editor

function Canvas() {
        const gl = useGL({
                width: 256,
                height: 256,
                fragment: `
                #version 300 es
                precision mediump float;
                uniform vec2 iResolution;
                uniform vec2 iMouse;
                uniform float iTime;
                out vec4 fragColor;
                void main() {
                        vec2 uv = gl_FragCoord.xy / iResolution.xy;
                        fragColor = vec4(iMouse + uv, sin(iTime), 1.0);
                }
                `,
        })
        return <canvas ref={gl.ref} />
}

Result

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WebGPU

Live Editor

function Canvas() {
        const gl = useGL({
                width: 256,
                height: 256,
                fragment: `
                @group(0) @binding(0) var<uniform> iResolution: vec2f;
                @group(0) @binding(1) var<uniform> iMouse: vec2f;
                @group(0) @binding(2) var<uniform> iTime: f32;
                @fragment
                fn main(@builtin(position) position: vec4f) -> @location(0) vec4f {
                        let uv = position.xy / iResolution;
                        return vec4f(iMouse + uv, sin(iTime), 1.0);
                }
                `,
                isWebGL: false,
        })
        return <canvas ref={gl.ref} />
}

Result

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Attributes

WebGL

Live Editor

function Canvas() {
        const gl = useGL({
                width: 256,
                height: 256,
                count: 3,
                vertex: `
                #version 300 es
                in vec4 a_position;
                void main() {
                        gl_Position = a_position;
                }
                `,
        })
        gl.attribute('a_position', [0, 0.73, -1, -1, 1, -1])
        return <canvas ref={gl.ref} />
}

Result

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WebGPU

Live Editor

function Canvas() {
        const gl = useGL({
                width: 256,
                height: 256,
                count: 3,
                vertex: `
                @vertex
                fn main(@location(0) position: vec2f) -> @builtin(position) vec4f {
                        return vec4f(position, 0.0, 1.0);
                }
                `,
                isWebGL: false,
        })
        gl.attribute('a_position', [0, 0.73, -1, -1, 1, -1])
        return <canvas ref={gl.ref} />
}

Result

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Textures

WebGL

Live Editor

function Canvas() {
        const gl = useGL({
                width: 256,
                height: 256,
                fragment: `
                #version 300 es
                precision mediump float;
                uniform vec2 iResolution;
                uniform sampler2D iTexture;
                out vec4 fragColor;
                void main() {
                        vec2 uv = gl_FragCoord.xy / iResolution.xy;
                        fragColor = texture(iTexture, uv);
                }
                `,
        })
        gl.texture('iTexture', 'https://avatars.githubusercontent.com/u/40712342')
        return <canvas ref={gl.ref} />
}

Result

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WebGPU

Live Editor

function Canvas() {
        const gl = useGL({
                width: 256,
                height: 256,
                fragment: `
                @group(0) @binding(0) var<uniform> iResolution: vec2f;
                @group(1) @binding(0) var iSampler: sampler;
                @group(1) @binding(1) var iTexture: texture_2d<f32>;
                @fragment
                fn main(@builtin(position) position: vec4f) -> @location(0) vec4f {
                        let uv = position.xy / iResolution;
                        return textureSample(iTexture, iSampler, uv);
                }
                `,
                isWebGL: false,
        })
        gl.texture('iTexture', 'https://avatars.githubusercontent.com/u/40712342')
        return <canvas ref={gl.ref} />
}

Result

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