Is there a way to check for WebGL support in three.js and switch to a standard Canvas render if not available? I'd appreciate any insights from those who have experience with this library.
Is there a way to check for WebGL support in three.js and switch to a standard Canvas render if not available? I'd appreciate any insights from those who have experience with this library.
Absolutely! You have the option to utilize CanvasRenderer in place of WebGLRenderer.
Regarding WebGL detection:
1) Take a look at this informative WebGL wiki article:
if (!window.WebGLRenderingContext) {
// the browser does not recognize WebGL
window.location = "http://get.webgl.org";
} else {
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("webgl");
if (!context) {
// WebGL supported but initialization failed
window.location = "http://get.webgl.org/troubleshooting";
}
}
2) You can also utilize Three.js's built-in WebGL detector: https://github.com/mrdoob/three.js/blob/master/examples/js/Detector.js
renderer = Detector.webgl? new THREE.WebGLRenderer(): new THREE.CanvasRenderer();
3) Additionally, consider the Modernizr detector: https://github.com/Modernizr/Modernizr/blob/master/feature-detects/webgl.js
After finding Juan Mellado's suggestion for the Three.js detector quite helpful, I decided to extract just the Detector.webgl() function without bringing in the entire file into my project.
function checkWebglSupport() {
try {
var canvas = document.createElement("canvas");
return !!
window.WebGLRenderingContext &&
(canvas.getContext("webgl") ||
canvas.getContext("experimental-webgl"));
} catch(e) {
return false;
}
}
You can use this function just like in Juan's example:
renderer = checkWebglSupport() ? new THREE.WebGLRenderer() : new THREE.CanvasRenderer();
Unfortunately, merely detecting WebGL support does not guarantee optimal performance. WebGL may rely on software renderers such as "Google SwiftShader" or partial emulation like "Mesa 3D". In particular, when utilizing a robust 2D renderer like Mesa 2D, it may be beneficial to manually select the canvas even if WebGL support appears to be present.
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