Implementing Dynamic Range Adjustment using WebGLTileLayer? Need advice and feedback

[BeGj]

For some use cases it is necessary to support Dynamic Range Adjustments on pixels on a WebGLTileLayer and GeoTIFFSource. Sometimes automatically recalculating it on every mapMoved event.

Currently as I know, it is only possible by doing calulations using WebGLTileLayer's getData(pixel) method on every extent change. And then updating styleVariables. I believe the first part of this is highly inefficient, so my question is:

• Is there a better method implemented that is possible to use? Or is it something we can improve or develop on OpenLayers?
• Do we need to create a custom shader? If so, how do we integrate it, do we need a custom WebGLTileLayer?
• Is it possible and would it be more efficient to do a single getDataInExtent(extent) for every extent change?v
• And how do we get to implementing a webgl shader doing everything outside of js? Is it viable?
• Is it already possible to implement it in a style without updateStyleVariables from the outside?

Advice greatly appreciated.