From a547b820752cf81a5244651703a6e977df42c611 Mon Sep 17 00:00:00 2001
From: Alessandro Portale <alessandro.portale@qt.io>
Date: Sun, 25 Apr 2021 23:08:39 +0200
Subject: [PATCH] App: Set OpenGL backend using the Qt 6 API

Qt 6 would emit:
"Qt::AA_UseOpenGLES is no longer supported in Qt 6"

Let's set the backend to OpenGL it via environment variable.
Setting it via QQuickWindow::setSceneGraphBackend would add a
dependency on "quick".

Fixes: QTCREATORBUG-25637
Change-Id: Ice53be9440c586008dea9ab3731050a63073bab0
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>
---
 src/app/main.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/app/main.cpp b/src/app/main.cpp
index 74f245d2c16..bc5e61c7840 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -537,9 +537,11 @@ int main(int argc, char **argv)
         }
     }
 
-#ifdef Q_OS_WIN
+#if defined(Q_OS_WIN) && QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     if (!qEnvironmentVariableIsSet("QT_OPENGL"))
         QCoreApplication::setAttribute(Qt::AA_UseOpenGLES);
+#else
+    qputenv("QT_QUICK_BACKEND", "opengl");
 #endif
 
     if (qEnvironmentVariableIsSet("QTCREATOR_DISABLE_NATIVE_MENUBAR")