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[Fix] (MG_Util): dlopen the versioned libEGL.so.1 first - the unversioned name is a dev-package symlink absent on runtime-only systems, and its silent failure nulled every EGL entry point

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swung0x48
2026-08-11 00:58:23 -04:00
parent 7ce0966e7d
commit ce0f18969c
1 changed files with 19 additions and 3 deletions
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MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.cpp
+19 -3
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@@ -568,13 +568,26 @@ namespace MobileGL::MG_Util::BackendLoader {
#if defined(MOBILEGL_IOS)
eglLib = OpenLib({"libtinygl4angle.dylib"});
#else
eglLib = OpenLib({"libEGL.so"});
// Versioned SONAME first. The unversioned "libEGL.so" is a development
// symlink: it ships in libegl-dev/mesa-libEGL-devel, NOT in the runtime
// package, so a machine that can run GL perfectly well may not have it -
// every stock Ubuntu/Debian runtime image, the GitHub Actions runners
// included. Asking only for the unversioned name there makes dlopen fail,
// which used to leave the whole EGL function table null and take the next
// call through a null pointer (SIGSEGV inside InitDisplayAndContext).
// Developer machines have both names, which is exactly why this only ever
// showed up in CI.
eglLib = OpenLib({"libEGL.so.1", "libEGL.so"});
#endif
}
#endif // !_WIN32
if (!eglLib) {
MGLOG_E("Failed to open EGL library");
// MGLOG_F, not MGLOG_E: at the INFO log level every shipping and CI build
// uses, MGLOG_E is compiled out (Log.h orders DEBUG < WARN < ERROR < INFO),
// so this diagnosis was invisible in precisely the builds that needed it.
MGLOG_F("Failed to open EGL library: none of libEGL.so.1 / libEGL.so could be "
"dlopened; every EGL entry point will be null");
return;
}
@@ -595,7 +608,10 @@ namespace MobileGL::MG_Util::BackendLoader {
do { \
funcs.name = (MG_External::EGL::name##_PTR)resolveEGLProc(#name); \
if (!funcs.name) { \
MGLOG_E("Failed to load EGL function: %s", #name); \
/* MGLOG_F for the same reason as the open failure above: a null entry */ \
/* point is a crash waiting for its first caller, and MGLOG_E is compiled */ \
/* out at the INFO level every shipping and CI build uses. */ \
MGLOG_F("Failed to load EGL function: %s", #name); \
} \
} while (0);