[Webkit-unassigned] [Bug 155536] Wrong use of EGL_DEPTH_SIZE

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155536

--- Comment #6 from Carlos Garcia Campos <cgarcia at igalia.com> ---
I've run into this issue too, both EGL_DEPTH_SIZE and EGL_BUFFER_SIZE are indeed confusing. What happens here is that the driver doesn't implement EGL_DEPTH_SIZE and the default value, which is 0, is returned. Then XCreatePixmap fails because 0 is not a valid depth. The thing is that even if EGL_DEPTH_SIZE or EGL_BUFFER_SIZE retuned a valid depth, it still might not be supported by the default screen and XCreatePixmap can fail. What we need to ensure is that the depth we pass is compatible with the X display, not only with the EGL config, to avoid failres when creating the pixmap. So, I think we can use EGL_NATIVE_VISUAL_ID instead, and then ask X for the visual info for that id. If not found then we just return before creating the pixmap. If the visual is found then we can be sure that the depth of the visual will not make the pixmap creation fail. However, with the driver I'm using it doesn't matter how we create the pixmap that eglCreatePixmapSurface always fails, again with X err

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