'Is there a way to get computed matrix in the process of WebGLTile rendering in OpenLayers?

In my project, I work with GeoTiff. I use OpenLayer's WebGLTile to apply some expression to combine bands (e.g. to compute NDVI) with the power of WebGL, and want to save the resulting matrix of the combined bands.

I've been searching through the source code of the library and couldn't figure out where the matrix from the applied expression is stored before being rendered on the layer's canvas.

Is there are some intermediate code with the computed matrix stored before it is being rendered on the canvas?

Thanks for the help!

renderingwebglopenlayers


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