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

[bugzilla-daemon at webkit.org]

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

--- Comment #16 from Daniel Rossi <electroteque at gmail.com> ---
@Dean Jackson

I am the original reporter. 

_gl.pixelStorei( _gl.UNPACK_FLIP_Y_WEBGL, true );

This has to be disabled. This inverts the picture natively because it renders upside down by default. 

Using this causes a black picture with HLS. 

I am now seeing reports by clients my flipy work arounds are now broken in IOS11. It's now a black picture again with HLS ! 

I don't have a new device to get IOS11. Iphone 5 has now been deprecated so I have absolutely nothing left to test with. 

The simulator shows up different I think. 


It has to be done within the shader. 

For a flipy in the vertex shader for Safari with HLS it's this

varying vec2 vUV;
            void main() {
                vUV = vec2( uv.x, 1.0 - uv.y); 
                gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
            }

This is the current work around and

_gl.pixelStorei( _gl.UNPACK_FLIP_Y_WEBGL, false );

I am very much struggling to test faults bought in with IOS11 because , more devices are knocked off the list getting it.

The HLS color channel inversion for IOS is another bug work around which I mentioned in Three.js where I reported the fix. 

It's this for IOS10 and I guess 11 with HLS. In the fragment shader. 

uniform sampler2D texture;
            varying vec2 vUV;
            void main() {
                gl_FragColor = texture2D( texture, vUV ).bgra;
            }

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