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isWebGL2 test failed unexpectedly

See original GitHub issue

https://github.com/mrdoob/three.js/blob/3a42fffb0635674a229249e6f8d1a7ffa50b7edf/src/renderers/webgl/WebGLCapabilities.js#L55 When the WebGLRenderer been created in a iframe/window, and its domElement appended to a parent DOM in another iframe/window, then isWebGL2 test will failed, because the actual constructor is window. WebGL2RenderingContext where window refers to the original window/iframe, so instanceof always returning false

Issue Analytics

State:
Created a year ago
Reactions:1
Comments:5

Top GitHub Comments

1reaction

Mugen87commented, Sep 17, 2022

We can reconsider this issue if more users run into it. For now, I would not prefer to exchange a simple instanceof check with an actual render to figure out the WebGL version.

0reactions

hxmwrcommented, Sep 17, 2022

Just change to isWebGL2 = true for this special situation, so I don’t need a library level fix for now. For the future maybe complie a small piece of GLSL which is webgl2 specific and then check the compile status to determine if a gl is really instance of webgl2. Thank you Mugen87 as always.

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