Combine gpu.js and phaser, but how?

Phaser 3
1

I need help to combine gpu.js with phaser. I want to create a dynamic webgl texture with gpu.js and use it in phaser. So I tried to add it with game.textures.addGLTexture(…) and use it afterwards for a sprite, but the result is somehow strange. You can see my test at: https://codepen.io/chris6/pen/vYYmPqy
Has somebody an idea how to get this working? In FF it works not at all, and in Chrome you see the two triangles and get a message like: “WebGL: INVALID_VALUE: bufferSubData: buffer overflow”