iOS: RGBADepthPacking doesn't work correctly

[cnspaha]

Description of the problem

MeshDepthMaterial with THREE.RGBADepthPacking doesn't work correctly on iOS.

How to reproduce:

Simply open https://threejs.org/examples/?q=chann#webgl_materials_channels on a iOS device and set the material to "depthRGBA".
The issue with the depth packing can be also seen when opening the SAO example.

Works fine on Chrome (Mobile), Firefox, Internet Explorer, Microsoft Edge, Safari.
Doesn't work on Safari Mobile

What to expect (screenshot from android device):

What I get:

Seems to be a problem with the RGBADepthPacking packing. will investigate it a bit further.

Three.js version

• Dev

Browser

• iOS Safari Mobile

OS

• iOS (11?)

Hardware Requirements (graphics card, VR Device, ...)

Device with iOS (iPhone), only tested iPhone X so far.

[Mugen87]

Seems like a duplicate: #9092

[cnspaha]

oh yeah you are right, haven't found this one