Honor QSG_RHI_BACKEND for now ...

build.rs

@@ -3,8 +3,8 @@ use cmake;
 fn main() {
 
     #![allow(unused_variables)]
-    let qt_include_path = std::env::var("DEP_QT_INCLUDE_PATH").unwrap();
-    let qt_library_path = std::env::var("DEP_QT_LIBRARY_PATH").unwrap();
+    let qt_include_path = std::env::var("QT_INCLUDE_PATH").unwrap();
+    let qt_library_path = std::env::var("QT_LIBRARY_PATH").unwrap();
 
     let dst = cmake::build("lib");
 

lib/xApplicationWindow.mm

@@ -16,7 +16,7 @@ public:
 
 xApplicationWindow::xApplicationWindow(QWindow *parent) : QObject()
 {
-    QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGL);
+    // QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGL);
 
     NSVisualEffectView *vibrant = [[NSVisualEffectView alloc] init];
     vibrant.blendingMode = NSVisualEffectBlendingModeBehindWindow;