[Webkit-unassigned] [Bug 176718] [GTK][X11] Windy.com shows always straight wind lines

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176718

Miguel Gomez <magomez at igalia.com> changed:

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                 CC|                            |magomez at igalia.com

--- Comment #3 from Miguel Gomez <magomez at igalia.com> ---
What happens here is that the page uses WebGL, and it's using a texture with GL_LUMINANCE_ALPHA format. This format is deprecated when using an OpenGL core profile. When using glx we use a 3.2 core profile if available, so the format is wrong and the rendering is buggy. But when using EGL we don't request an OpenGL version, so we get an older version that still supports the format and the rendering works.

The fix for this is easy, just backing GL_LUMINANCE_ALPHA with the appropriate format for a core profile. But at some point we should look into requesting a core profile for EGL as well. From what I read, in order to do this we require EGL 1.5 or EGL 1.4 and the extension EGL_KHR_create_context. I'll open a new bug to handle this.

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