[Webkit-unassigned] [Bug 218595] New: Allow non-power-of-two mipmapped compressed textures with WEBGL_compressed_texture_s3tc

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218595

            Bug ID: 218595
           Summary: Allow non-power-of-two mipmapped compressed textures
                    with WEBGL_compressed_texture_s3tc
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            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, jdarpinian at chromium.org,
                    kkinnunen at apple.com

In https://github.com/KhronosGroup/WebGL/issues/3117 the implementation of the WEBGL_compressed_texture_s3tc extension in Chromium has been revised to align better with the underlying specifications. Specifically, limited non-power-of-two support has been added, which is portable among all WebGL backends as far back as D3D9.

The test case in related https://github.com/BinomialLLC/basis_universal/issues/158 , http://ahyoomee.miru.hk/basis/demo/threejs.html , is now running correctly in Chrome and Safari, but has regressed in Safari Technology Preview and the ANGLE backend.

The validation of these compressed texture formats needs to be relaxed in order to allow this content to run portably.

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