[Webkit-unassigned] [Bug 163866] New: UNPACK_FLIP_Y_WEBGL breaks HLS video textures

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163866

            Bug ID: 163866
           Summary: UNPACK_FLIP_Y_WEBGL breaks HLS video textures
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: OS X 10.10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: electroteque at gmail.com
                CC: dino at apple.com

Hi there after some extensive testing I have confirmed that in Safari 10 it has broken WebGL video textures for HLS streams. It is an issue on IOS 9 Safari as well as Webkit nightly. 


It is regarding this FlipY flag

_gl.pixelStorei( _gl.UNPACK_FLIP_Y_WEBGL, true );

If this is disabled the video texture is rendering but it is upside down.Although I believe this flag is needed for hardware acceleration correct ? 


Reference to three.js ticket. 

https://github.com/mrdoob/three.js/issues/9754

Reference to possibly related webkit ticket #162491

I have found some raw webgl examples that I have modified for the test. The HLS streams use a CORS proxy because of the known severe limitation there. 

With FlipY disabled and "working"

http://dev.electroteque.org/threejs/webglworking.html


With FlipY enabled

http://dev.electroteque.org/threejs/webglflip.html

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