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Use EGL for all X11 GL context creation in Qt and SDL

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Using a mix of GLX and EGL can cause interoperability issues when
our EGLRenderer tries to bind an EGL context while Qt already has
a GLX context bound on the same thread. This was the source of a
number of confusing EGLRenderer failures over the years.
This commit is contained in:
Cameron Gutman 2025-11-22 18:51:32 -06:00
commit 4d6196c3d3
1 changed files with 3 additions and 3 deletions
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6
app/main.cpp
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@ -475,12 +475,12 @@ int main(int argc, char *argv[])
#endif #endif
} }
#ifndef Q_PROCESSOR_X86
// Some ARM and RISC-V embedded devices don't have working GLX which can cause // Some ARM and RISC-V embedded devices don't have working GLX which can cause
// SDL to fail to find a working OpenGL implementation at all. Let's force EGL // SDL to fail to find a working OpenGL implementation at all. Let's force EGL
// on non-x86 platforms, since GLX is deprecated anyway. // on all platforms for both SDL and Qt. This also avoids GLX-EGL interop issues
// when trying to use EGL on the main thread after Qt uses GLX.
SDL_SetHint(SDL_HINT_VIDEO_X11_FORCE_EGL, "1"); SDL_SetHint(SDL_HINT_VIDEO_X11_FORCE_EGL, "1");
#endif qputenv("QT_XCB_GL_INTEGRATION", "xcb_egl");
#ifdef Q_OS_MACOS #ifdef Q_OS_MACOS
// This avoids using the default keychain for SSL, which may cause // This avoids using the default keychain for SSL, which may cause