Add missing fallback for glxGetProcAddress

This fallback was added in 5.11, however fell out somehow
during ozone change.

Fixes: QTBUG-70696
Change-Id: I68d12842e2283a25db64035e57d5a19323b4e6c0
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

1 files changed, 18 insertions, 1 deletions

diff --git a/src/core/ozone/gl_ozone_glx_qt.cpp b/src/core/ozone/gl_ozone_glx_qt.cpp
index 9a0fea7c7..2e7a28a0e 100644
--- a/src/core/ozone/gl_ozone_glx_qt.cpp
+++ b/src/core/ozone/gl_ozone_glx_qt.cpp
@@ -41,7 +41,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-
+#include <QGuiApplication>
 #include "gl_ozone_glx_qt.h"
 #include "gl_surface_glx_qt.h"
 #include "ui/gl/gl_context_glx.h"
@@ -49,6 +49,13 @@
 #include "ui/gl/gl_glx_api_implementation.h"
 #include <dlfcn.h>
 
+#ifndef QT_NO_OPENGL
+#include <QOpenGLContext>
+QT_BEGIN_NAMESPACE
+Q_GUI_EXPORT QOpenGLContext *qt_gl_global_share_context();
+QT_END_NAMESPACE
+#endif
+
 namespace ui {
 
 bool GLOzoneGLXQt::InitializeGLOneOffPlatform() {
@@ -72,6 +79,16 @@ bool GLOzoneGLXQt::InitializeStaticGLBindings(
             reinterpret_cast<gl::GLGetProcAddressProc>(
                 base::GetFunctionPointerFromNativeLibrary(library,
                                                           "glXGetProcAddress"));
+
+#ifndef QT_NO_OPENGL
+    if (!get_proc_address) {
+    // glx handle not loaded, fallback to qpa
+        if (QOpenGLContext *context = qt_gl_global_share_context()) {
+            get_proc_address = reinterpret_cast<gl::GLGetProcAddressProc>(
+                context->getProcAddress("glXGetProcAddress"));
+        }
+    }
+#endif
     if (!get_proc_address) {
         LOG(ERROR) << "glxGetProcAddress not found.";
         base::UnloadNativeLibrary(library);