[Webkit-unassigned] [Bug 210524] New: OES_texture_float / OES_texture_half_float unavailable in WebGL 1.0 on iOS Simulator with ANGLE

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210524

            Bug ID: 210524
           Summary: OES_texture_float / OES_texture_half_float unavailable
                    in WebGL 1.0 on iOS Simulator with ANGLE
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iPhone / iPad
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kbr at google.com
                CC: dino at apple.com

Visiting https://webglreport.com/ on the iOS Simulator with both the current OpenGL ES and the forthcoming ANGLE backend, it appears that OES_texture_float and OES_texture_half_float are supported on the old (non-ANGLE) backend, but not supported on the ANGLE backend.

This might be related indirectly to Chromium bug http://crbug.com/1067122 , where these extensions are not showing up on some other mobile devices, either.

The problem might be overly strict renderability checks than required according to the extension specification - since framebuffer completeness is essentially allowed to fail per specification for almost any reason in OpenGL ES 2.0. In particular, RGB32F and RGB16F textures might not be color-renderable on this hardware, and ANGLE might be requiring them to be in order to expose these extensions.

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