163595 2016-10-18 05:52:14 -0700 [GTK] Does not use GLES2 in Wayland when rendering with gdk_cairo_draw_from_gl 2016-11-20 16:59:46 -0800 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build PC Linux NEW P3 Normal --- 1 manday webkit-unassigned bugs-noreply cgarcia clopez jmcasanova mcatanzaro oldest_to_newest 1241418 0 manday 2016-10-18 05:52:14 -0700 Compiled with ENABLE_OPENGL=ON ENABLE_GLES2=ON, Webkit attempts to use GL and fails due to absesence of libGL.so. I broke on gdk_gl_context_set_use_es where a GdkGLContext is created with NO GLES2 and the backtrace reads as attached 1241420 1 291943 manday 2016-10-18 05:53:45 -0700 Created attachment 291943 Backtrace 1241434 2 manday 2016-10-18 07:46:58 -0700 According to a GTK+ dev, Webkit is supposed to request GLES - Gdk does not automatially detect the availability or preference. 1241450 3 clopez 2016-10-18 08:57:04 -0700 Can you check the output of: 1. ldd /path/to/libwebkit2gtk-4.0.so.37 2. ldd /path/to/WebKitWebProcess Does any of them link with libGL or give any error related to libraries not found? 1241453 4 mcatanzaro 2016-10-18 09:08:51 -0700 (In reply to comment #2) > According to a GTK+ dev, Webkit is supposed to request GLES - Gdk does not > automatially detect the availability or preference. If environment variables are the only way, you'll have to set them before starting WebKit. We're not going to mess with that. 1243645 5 cgarcia 2016-10-24 01:22:11 -0700 (In reply to comment #2) > According to a GTK+ dev, Webkit is supposed to request GLES - Gdk does not > automatially detect the availability or preference. That's not really possible I'm afraid. gdk_cairo_draw_from_gl() uses the paint gl context of the given window that is always created with a NULL sharing context and realized right after being created. On realize is when using ES is decided, and the only way to change that for the paint gl context is using the debug flags. I don't think using debug flags for this is the right way. I think there should be a way to tell GDK to use ES globally, maybe in GdkWindow to use that when creating the paint context. Or maybe there's actually a way that is not the debug flags, but I haven't found it reading the code. 1243646 6 cgarcia 2016-10-24 01:24:29 -0700 What I would do as a workaround for now is to fallback to glReadPixels when USE(OPENGL_ES_2) is enabled. 291943 2016-10-18 05:53:45 -0700 2016-10-18 05:53:45 -0700 Backtrace bt.txt text/plain 7926 manday IzAgIGdka19nbF9jb250ZXh0X3NldF91c2VfZXMgKGNvbnRleHQ9MHhhYTZjMzAsIHVzZV9lcz0w KSBhdCAuLi8uLi9ndGsrLTMuMjIuMS9nZGsvZ2RrZ2xjb250ZXh0LmM6NzAyCiMxICAweDAwMDA3 ZmZmZjQ3OTYyMzggaW4gZ2RrX3dheWxhbmRfZ2xfY29udGV4dF9yZWFsaXplIChjb250ZXh0PTB4 YWE2YzMwLCBlcnJvcj0weDdmZmZmZmZmYzY0MCkgYXQgLi4vLi4vLi4vZ3RrKy0zLjIyLjEvZ2Rr L3dheWxhbmQvZ2RrZ2xjb250ZXh0LXdheWxhbmQuYzoyMTcKIzIgIDB4MDAwMDdmZmZmNDc2ZDEx OSBpbiBnZGtfZ2xfY29udGV4dF9yZWFsaXplIChjb250ZXh0PWNvbnRleHRAZW50cnk9MHhhYTZj MzAsIGVycm9yPWVycm9yQGVudHJ5PTB4N2ZmZmZmZmZjNjQwKSBhdCAuLi8uLi9ndGsrLTMuMjIu MS9nZGsvZ2RrZ2xjb250ZXh0LmM6NzU1CiMzICAweDAwMDA3ZmZmZjQ3Nzk3MWMgaW4gZ2RrX3dp 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