Enable QRhi Metal backend on iOS

While we are at it, remove the Border and MirrorOnce wrap modes that have
not been supported on OpenGL, because they are unsupported with Metal+iOS
as well.

Task-number: QTBUG-78580
Change-Id: I0db94b9d3a6125b3bb5d7b1db5d02a42cd94d2c2
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

1 files changed, 28 insertions, 7 deletions

diff --git a/src/plugins/platforms/ios/quiview.mm b/src/plugins/platforms/ios/quiview.mm
index 91a186bace..59eae07388 100644
--- a/src/plugins/platforms/ios/quiview.mm
+++ b/src/plugins/platforms/ios/quiview.mm
@@ -100,13 +100,15 @@ Q_LOGGING_CATEGORY(lcQpaTablet, "qt.qpa.input.tablet")
 - (instancetype)initWithFrame:(CGRect)frame
 {
     if ((self = [super initWithFrame:frame])) {
-        // Set up EAGL layer
-        CAEAGLLayer *eaglLayer = static_cast<CAEAGLLayer *>(self.layer);
-        eaglLayer.opaque = TRUE;
-        eaglLayer.drawableProperties = @{
-            kEAGLDrawablePropertyRetainedBacking: @(YES),
-            kEAGLDrawablePropertyColorFormat: kEAGLColorFormatRGBA8
-        };
+        if ([self.layer isKindOfClass:[CAEAGLLayer class]]) {
+            // Set up EAGL layer
+            CAEAGLLayer *eaglLayer = static_cast<CAEAGLLayer *>(self.layer);
+            eaglLayer.opaque = TRUE;
+            eaglLayer.drawableProperties = @{
+                kEAGLDrawablePropertyRetainedBacking: @(YES),
+                kEAGLDrawablePropertyColorFormat: kEAGLColorFormatRGBA8
+            };
+        }
 
         if (isQtApplication())
             self.hidden = YES;
@@ -675,6 +677,25 @@ Q_LOGGING_CATEGORY(lcQpaTablet, "qt.qpa.input.tablet")
 
 @end
 
+#ifdef Q_OS_IOS
+@implementation QUIMetalView
+
++ (Class)layerClass
+{
+#ifdef TARGET_IPHONE_SIMULATOR
+    if (@available(ios 13.0, *))
+#endif
+
+    return [CAMetalLayer class];
+
+#ifdef TARGET_IPHONE_SIMULATOR
+    return nil;
+#endif
+}
+
+@end
+#endif
+
 #ifndef QT_NO_ACCESSIBILITY
 // Include category as an alternative to using -ObjC (Apple QA1490)
 #include "quiview_accessibility.mm"