Bug 252359

Summary: iOS Safari incorrectly reports supporting OES_texture_float_linear
Product: WebKit Reporter: Gregg Tavares <gman>
Component: WebGLAssignee: Nobody <webkit-unassigned>
Status: RESOLVED FIXED    
Severity: Normal CC: dino, kbr, kkinnunen, roberto.ranon, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: iPhone / iPad   
OS: iOS 16   
Bug Depends on: 254064    
Bug Blocks:    

Description Gregg Tavares 2023-02-15 15:44:25 PST 
On my iPhone 13 Pro running iOS 16.3.1, iOS Safari incorrectly reports supporting OES_texture_float_linear

see https://webgplreport.com

notice: OES_texture_float_linear shows up as a supported extension

Then, go to: https://jsgist.org/?src=94615d573985d60b76314bd4857f6410

First try desktop: See the texture is filtered (the texture is an RGBA32 texture)

Now go the same url on iPhone, See the texture is not filtered

Note: The conformance test for oes_texture_float_linear passes on iOS but looking into the source it never actually checks if results are actually filtered.

https://registry.khronos.org/webgl/sdk/tests/conformance/extensions/oes-texture-float-linear.html?webglVersion=2&quiet=0&quick=1
Comment 1 Kimmo Kinnunen 2023-02-18 04:20:25 PST 
Thanks for the report!
Yes, I think the issue is that the iOS hardware does not support RGBA32Float filterability. We need to update the ANGLE texture format tables..
Comment 3 Radar WebKit Bug Importer 2023-02-22 15:45:18 PST 
<rdar://problem/105803356>
Comment 4 Kimmo Kinnunen 2023-11-09 01:12:22 PST 
Fixed in bug 254064
Comment 5 Kimmo Kinnunen 2023-11-09 01:26:20 PST 
*** Bug 264404 has been marked as a duplicate of this bug. ***