This example uses OpenLayers v10.9.0. The latest is v.
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#### WebGL Tile Layer Styles

webgl 18 style 27

#####

exposure
contrast
saturation

Styling raster tiles with WebGL.

The `style` property of a WebGL tile layer can be used to adjust properties like `exposure`, `contrast`, and `saturation`. Typically those values would be set to numeric constants to apply a filter to imagery. In this example, the style properties are set to variables that can be updated based on application state. Adjusting the sliders results in a call to `layer.updateStyleVariables()` to use new values for the associated style properties.

##### main.js

    import Map from 'ol/Map.js';
    import View from 'ol/View.js';
    import TileLayer from 'ol/layer/WebGLTile.js';
    import ImageTile from 'ol/source/ImageTile.js';

    const key = 'Get your own API key at https://www.maptiler.com/cloud/';
    const attributions =
      '<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
      '<a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>';

    const variables = {
      exposure: 0,
      contrast: 0,
      saturation: 0,
    };

    const layer = new TileLayer({
      style: {
        exposure: ['var', 'exposure'],
        contrast: ['var', 'contrast'],
        saturation: ['var', 'saturation'],
        variables: variables,
      },
      source: new ImageTile({
        attributions: attributions,
        url: 'https://api.maptiler.com/maps/satellite/{z}/{x}/{y}.jpg?key=' + key,
        tileSize: 512,
        maxZoom: 20,
      }),
    });

    const map = new Map({
      target: 'map',
      layers: [layer],
      view: new View({
        center: [0, 0],
        zoom: 0,
      }),
    });

    let variable;
    for (variable in variables) {
      const name = variable;
      const element = document.getElementById(name);
      const value = variables[name];
      element.value = value.toString();
      document.getElementById(name + '-value').innerText = value.toFixed(2);
      element.addEventListener('input', function (event) {
        const value = parseFloat(event.target.value);
        document.getElementById(name + '-value').innerText = value.toFixed(2);
        layer.updateStyleVariables({[name]: value});
      });
    }

##### index.html

    <!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="UTF-8">
        <title>WebGL Tile Layer Styles</title>
        <link rel="stylesheet" href="node_modules/ol/ol.css">
        <style>
          .map {
            width: 100%;
            height: 400px;
          }
          #controls {
            display: flex;
            justify-content: space-around;
          }
        </style>
      </head>
      <body>
        <div id="map" class="map"></div>
        <div id="controls">
          <label>
            <input id="exposure" type="range" min="-0.5" max="0.5" step="0.01">
            <br>exposure <span id="exposure-value"></span>
          </label>
          <label>
            <input id="contrast" type="range" min="-0.5" max="0.5" step="0.01">
            <br>contrast <span id="contrast-value"></span>
          </label>
          <label>
            <input id="saturation" type="range" min="-0.5" max="0.5" step="0.01">
            <br>saturation <span id="saturation-value"></span>
          </label>
        </div>

        <script type="module" src="main.js"></script>
      </body>
    </html>

##### package.json

    {
      "name": "webgl-tile-style",
      "dependencies": {
        "ol": "10.9.0"
      },
      "devDependencies": {
        "vite": "^3.2.3"
      },
      "scripts": {
        "start": "vite",
        "build": "vite build"
      }
    }