Enabled Vulkan mode on iOS (close https://github.com/DiligentGraphics/DiligentCore/issues/46)

18 files changed, 485 insertions, 195 deletions

diff --git a/Common/NativeApp/Apple/Data/iOS/Base.lproj/LaunchScreen.xib b/Common/NativeApp/Apple/Data/iOS/Base.lproj/LaunchScreen.xib
index 5569812..42589b0 100644
--- a/Common/NativeApp/Apple/Data/iOS/Base.lproj/LaunchScreen.xib
+++ b/Common/NativeApp/Apple/Data/iOS/Base.lproj/LaunchScreen.xib
@@ -1,9 +1,12 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="8121.20" systemVersion="14D136" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES">
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES">
+    <device id="retina5_9" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8101.16"/>
-        <capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
@@ -12,20 +15,20 @@
             <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
             <subviews>
-                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="  Copyright © 2015-2019 Diligent Graphics." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="8ie-xW-0ye">
+                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" misplaced="YES" text="  Copyright © 2015-2019 Diligent Graphics." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="8ie-xW-0ye">
                     <rect key="frame" x="20" y="439" width="441" height="21"/>
                     <fontDescription key="fontDescription" type="system" pointSize="17"/>
-                    <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
+                    <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                     <nil key="highlightedColor"/>
                 </label>
-                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Diligent Engine" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="kId-c2-rCX">
+                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" misplaced="YES" text="Diligent Engine" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="kId-c2-rCX">
                     <rect key="frame" x="20" y="140" width="441" height="43"/>
                     <fontDescription key="fontDescription" type="boldSystem" pointSize="36"/>
-                    <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
+                    <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                     <nil key="highlightedColor"/>
                 </label>
             </subviews>
-            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+            <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
             <constraints>
                 <constraint firstItem="kId-c2-rCX" firstAttribute="centerY" secondItem="iN0-l3-epB" secondAttribute="bottom" multiplier="1/3" constant="1" id="5cJ-9S-tgC"/>
                 <constraint firstAttribute="centerX" secondItem="kId-c2-rCX" secondAttribute="centerX" id="Koa-jz-hwk"/>
diff --git a/Common/NativeApp/Apple/Data/iOS/Base.lproj/Main.storyboard b/Common/NativeApp/Apple/Data/iOS/Base.lproj/Main.storyboard
index 0dc87c1..026129a 100644
--- a/Common/NativeApp/Apple/Data/iOS/Base.lproj/Main.storyboard
+++ b/Common/NativeApp/Apple/Data/iOS/Base.lproj/Main.storyboard
@@ -1,26 +1,89 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8121.20" systemVersion="14D136" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="XIi-06-RrN">
+    <device id="retina5_9" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8101.16"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
-        <!--View Controller-->
+        <!--Mode Selection View Controller-->
+        <scene sceneID="zOR-Fi-Gze">
+            <objects>
+                <viewController id="XIi-06-RrN" customClass="ModeSelectionViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="xws-yS-Cpz"/>
+                        <viewControllerLayoutGuide type="bottom" id="eBA-xl-v26"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="bQn-Ig-dl7" customClass="BaseView">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="CtC-44-7bh" userLabel="OpenGLES">
+                                <rect key="frame" x="43" y="270" width="289" height="119"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                <state key="normal" title="Button" image="opengles-logo.png"/>
+                                <connections>
+                                    <action selector="goOpenGLES:" destination="XIi-06-RrN" eventType="touchUpInside" id="Mad-GE-H0I"/>
+                                </connections>
+                            </button>
+                            <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Exn-mx-E3B" userLabel="Vulkan">
+                                <rect key="frame" x="36" y="425" width="302" height="120"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                <state key="normal" title="Button" image="vulkan-logo.png"/>
+                                <connections>
+                                    <action selector="goVulkan:" destination="XIi-06-RrN" eventType="touchUpInside" id="jsv-Uc-EF5"/>
+                                </connections>
+                            </button>
+                        </subviews>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="voS-RJ-rQF" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-1458.4000000000001" y="73.891625615763544"/>
+        </scene>
+        <!--Metal View Controller-->
+        <scene sceneID="sxp-To-dZO">
+            <objects>
+                <viewController storyboardIdentifier="MetalViewControllerID" id="2n5-tG-bFt" userLabel="Metal View Controller" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="X8x-0E-yac"/>
+                        <viewControllerLayoutGuide type="bottom" id="6Gz-x2-Owi"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="fUr-Le-qAJ" customClass="MetalView">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="xSS-Vf-fsO" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-570" y="74"/>
+        </scene>
+        <!--EAGL View Controller-->
         <scene sceneID="tne-QT-ifu">
             <objects>
-                <viewController id="BYZ-38-t0r" sceneMemberID="viewController">
+                <viewController storyboardIdentifier="EAGLViewControllerID" title="EAGL View Controller" id="BYZ-38-t0r" sceneMemberID="viewController">
                     <layoutGuides>
                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
                     </layoutGuides>
-                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC" customClass="EAGLView">
-                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC" userLabel="EAGL View" customClass="EAGLView">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                     </view>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
             </objects>
+            <point key="canvasLocation" x="214" y="74"/>
         </scene>
     </scenes>
+    <resources>
+        <image name="opengles-logo.png" width="1500" height="500"/>
+        <image name="vulkan-logo.png" width="1300" height="500"/>
+    </resources>
 </document>
diff --git a/Common/NativeApp/Apple/Data/iOS/Images.xcassets/opengles-logo.png b/Common/NativeApp/Apple/Data/iOS/Images.xcassets/opengles-logo.png
new file mode 100755
index 0000000..88b6983
--- /dev/null
+++ b/Common/NativeApp/Apple/Data/iOS/Images.xcassets/opengles-logo.png
diff --git a/Common/NativeApp/Apple/Data/iOS/Images.xcassets/vulkan-logo.png b/Common/NativeApp/Apple/Data/iOS/Images.xcassets/vulkan-logo.png
new file mode 100644
index 0000000..8a15b9e
--- /dev/null
+++ b/Common/NativeApp/Apple/Data/iOS/Images.xcassets/vulkan-logo.png
diff --git a/Common/NativeApp/Apple/Source/Classes/iOS/AppDelegate.h b/Common/NativeApp/Apple/Source/Classes/iOS/AppDelegate.h
index bbb1f04..3839faa 100644
--- a/Common/NativeApp/Apple/Source/Classes/iOS/AppDelegate.h
+++ b/Common/NativeApp/Apple/Source/Classes/iOS/AppDelegate.h
@@ -9,9 +9,6 @@
 
 #import <UIKit/UIKit.h>
 
-@class EAGLView;
-@class MainViewController;
-
 @interface AppDelegate : NSObject <UIApplicationDelegate> {
 }
 
diff --git a/Common/NativeApp/Apple/Source/Classes/iOS/AppDelegate.m b/Common/NativeApp/Apple/Source/Classes/iOS/AppDelegate.m
index 6aa6648..5e1745c 100644
--- a/Common/NativeApp/Apple/Source/Classes/iOS/AppDelegate.m
+++ b/Common/NativeApp/Apple/Source/Classes/iOS/AppDelegate.m
@@ -7,7 +7,7 @@
 */
  
 #import "AppDelegate.h"
-#import "EAGLView.h"
+#import "BaseView.h"
 
 @implementation AppDelegate
 
@@ -15,19 +15,12 @@
 #pragma mark Application lifecycle
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
-{    
+{
     // Override point for customization after application launch.
-    
+
     [self.window makeKeyAndVisible];
-    
-    NSString *error = [(EAGLView*)self.window.rootViewController.view getError];
-    if(error != nil)
-    {
-        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failed to start the application" message:error delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"Whatever", nil];
-        [alert show];
-    }
 
-	[(EAGLView*)self.window.rootViewController.view startAnimation];
+	[(BaseView*)self.window.rootViewController.view startAnimation];
 
     return YES;
 }
@@ -40,7 +33,7 @@
      Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
      */
 
-	[(EAGLView*)self.window.rootViewController.view stopAnimation];
+	[(BaseView*)self.window.rootViewController.view stopAnimation];
 }
 
 
@@ -50,7 +43,7 @@
      If your application supports background execution, called instead of applicationWillTerminate: when the user quits.
      */
 	
-	[(EAGLView*)self.window.rootViewController.view stopAnimation];
+	[(BaseView*)self.window.rootViewController.view stopAnimation];
 }
 
 
@@ -59,7 +52,7 @@
      Called as part of transition from the background to the inactive state: here you can undo many of the changes made on entering the background.
      */
 	
-	[(EAGLView*)self.window.rootViewController.view startAnimation];
+	[(BaseView*)self.window.rootViewController.view startAnimation];
 }
 
 
@@ -69,7 +62,7 @@
      Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
      */
 	
-	[(EAGLView*)self.window.rootViewController.view startAnimation];
+	[(BaseView*)self.window.rootViewController.view startAnimation];
 }
 
 
@@ -79,8 +72,8 @@
      See also applicationDidEnterBackground:.
      */
 	
-	[(EAGLView*)self.window.rootViewController.view stopAnimation];
-    [(EAGLView*)self.window.rootViewController.view terminate];
+	[(BaseView*)self.window.rootViewController.view stopAnimation];
+    [(BaseView*)self.window.rootViewController.view terminate];
 }
 
 
diff --git a/Common/NativeApp/Apple/Source/Classes/iOS/AppViewBase.h b/Common/NativeApp/Apple/Source/Classes/iOS/AppViewBase.h
new file mode 100644
index 0000000..e6273e9
--- /dev/null
+++ b/Common/NativeApp/Apple/Source/Classes/iOS/AppViewBase.h
@@ -0,0 +1,16 @@
+
+#import <UIKit/UIKit.h>
+#import "BaseView.h"
+
+@interface AppViewBase : BaseView
+
+@property (nonatomic) NSInteger animationFrameInterval;
+
+- (void) initApp:(int)deviceType;
+- (void) startAnimation;
+- (void) stopAnimation;
+- (void) terminate;
+- (void) render;
+- (NSString*)getError;
+
+@end
diff --git a/Common/NativeApp/Apple/Source/Classes/iOS/AppViewBase.m b/Common/NativeApp/Apple/Source/Classes/iOS/AppViewBase.m
new file mode 100644
index 0000000..e7d4c57
--- /dev/null
+++ b/Common/NativeApp/Apple/Source/Classes/iOS/AppViewBase.m
@@ -0,0 +1,166 @@
+
+#import "AppViewBase.h"
+
+#include "NativeAppBase.h"
+#include <memory>
+#include <string>
+
+@interface AppViewBase ()
+{
+    std::unique_ptr<Diligent::NativeAppBase> _theApp;
+    NSInteger _animationFrameInterval;
+    CADisplayLink* _displayLink;
+    std::string _error;
+}
+@end
+
+@implementation AppViewBase
+
+- (void) initApp:(int)deviceType;
+{
+    try
+    {
+        _theApp.reset(Diligent::CreateApplication());
+        // Init our renderer.
+        _theApp->Initialize(deviceType, (__bridge void*)self.layer);
+    }
+    catch(std::runtime_error &err)
+    {
+        _error = err.what();
+        _theApp.reset();
+    }
+    
+    [super stopAnimation];
+    _animationFrameInterval = 1;
+    _displayLink = nil;
+}
+
+- (void) render
+{
+    if(_theApp)
+    {
+        _theApp->Update();
+        _theApp->Render();
+        _theApp->Present();
+    }
+}
+
+- (void) layoutSubviews
+{
+    auto bounds = [self.layer bounds];
+    auto scale = [self.layer contentsScale];
+    
+    if(_theApp)
+    {
+        _theApp->WindowResize(bounds.size.width * scale, bounds.size.height * scale);
+    }
+}
+
+- (NSInteger) animationFrameInterval
+{
+	return _animationFrameInterval;
+}
+
+- (void) setAnimationFrameInterval:(NSInteger)frameInterval
+{
+	// Frame interval defines how many display frames must pass between each time the
+	// display link fires. The display link will only fire 30 times a second when the
+	// frame internal is two on a display that refreshes 60 times a second. The default
+	// frame interval setting of one will fire 60 times a second when the display refreshes
+	// at 60 times a second. A frame interval setting of less than one results in undefined
+	// behavior.
+	if (frameInterval >= 1)
+	{
+		_animationFrameInterval = frameInterval;
+		
+		if (self.animating)
+		{
+			[self stopAnimation];
+			[self startAnimation];
+		}
+	}
+}
+
+- (void) startAnimation
+{
+	if (!self.animating)
+	{
+        // Create the display link and set the callback to our drawView method
+        _displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(drawView:)];
+
+        // Set it to our _animationFrameInterval
+        [_displayLink setFrameInterval:_animationFrameInterval];
+
+        // Have the display link run on the default runn loop (and the main thread)
+        [_displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
+		
+        [super startAnimation];
+	}
+}
+
+- (void)stopAnimation
+{
+	if (self.animating)
+	{
+        [_displayLink invalidate];
+        _displayLink = nil;
+        [super stopAnimation];
+	}
+}
+
+- (void)terminate
+{
+    _theApp.reset();
+    [super terminate];
+}
+
+- (NSString*)getError
+{
+    return _error.empty() ? nil : [NSString stringWithFormat:@"%s", _error.c_str()];
+}
+
+- (void)touchesBegan:(NSSet<UITouch *> *)touches
+           withEvent:(UIEvent *)event;
+{
+    UITouch *firstTouch = touches.allObjects[0];
+    CGPoint location = [firstTouch locationInView:self];
+    if(_theApp)
+    {
+        _theApp->OnTouchBegan(location.x, location.y);
+    }
+}
+
+- (void)touchesMoved:(NSSet<UITouch *> *)touches
+           withEvent:(UIEvent *)event;
+{
+    UITouch *firstTouch = touches.allObjects[0];
+    CGPoint location = [firstTouch locationInView:self];
+    if(_theApp)
+    {
+        _theApp->OnTouchMoved(location.x, location.y);
+    }
+}
+
+- (void)touchesEnded:(NSSet<UITouch *> *)touches
+           withEvent:(UIEvent *)event;
+{
+    UITouch *firstTouch = touches.allObjects[0];
+    CGPoint location = [firstTouch locationInView:self];
+    if(_theApp)
+    {
+        _theApp->OnTouchEnded(location.x, location.y);
+    }
+}
+
+- (void)touchesCancelled:(NSSet<UITouch *> *)touches
+               withEvent:(UIEvent *)event;
+{
+    UITouch *firstTouch = touches.allObjects[0];
+    CGPoint location = [firstTouch locationInView:self];
+    if(_theApp)
+    {
+        _theApp->OnTouchEnded(location.x, location.y);
+    }
+}
+
+@end
diff --git a/Common/NativeApp/Apple/Source/Classes/iOS/BaseView.h b/Common/NativeApp/Apple/Source/Classes/iOS/BaseView.h
new file mode 100644
index 0000000..9e8b99e
--- /dev/null
+++ b/Common/NativeApp/Apple/Source/Classes/iOS/BaseView.h
@@ -0,0 +1,12 @@
+
+#import <UIKit/UIKit.h>
+
+@interface BaseView : UIView
+
+@property (readonly, nonatomic, getter=isAnimating) BOOL animating;
+
+- (void) startAnimation;
+- (void) stopAnimation;
+- (void) terminate;
+
+@end
diff --git a/Common/NativeApp/Apple/Source/Classes/iOS/BaseView.m b/Common/NativeApp/Apple/Source/Classes/iOS/BaseView.m
new file mode 100644
index 0000000..c87e5cd
--- /dev/null
+++ b/Common/NativeApp/Apple/Source/Classes/iOS/BaseView.m
@@ -0,0 +1,21 @@
+
+#import "BaseView.h"
+
+@implementation BaseView
+
+- (void) startAnimation
+{
+    _animating = TRUE;
+}
+
+- (void)stopAnimation
+{
+    _animating = FALSE;
+}
+
+- (void) terminate
+{
+    
+}
+
+@end
diff --git a/Common/NativeApp/Apple/Source/Classes/iOS/EAGLView.h b/Common/NativeApp/Apple/Source/Classes/iOS/EAGLView.h
index fd6b9b9..e5ba68a 100644
--- a/Common/NativeApp/Apple/Source/Classes/iOS/EAGLView.h
+++ b/Common/NativeApp/Apple/Source/Classes/iOS/EAGLView.h
@@ -6,20 +6,13 @@
  The EAGLView class is a UIView subclass that renders OpenGL scene.
 */
 
-#import <UIKit/UIKit.h>
+#import "AppViewBase.h"
 
 // This class wraps the CAEAGLLayer from CoreAnimation into a convenient UIView subclass.
 // The view content is basically an EAGL surface you render your OpenGL scene into.
 // Note that setting the view non-opaque will only work if the EAGL surface has an alpha channel.
-@interface EAGLView : UIView
+@interface EAGLView : AppViewBase
 
-@property (readonly, nonatomic, getter=isAnimating) BOOL animating;
-@property (nonatomic) NSInteger animationFrameInterval;
-
-- (void) startAnimation;
-- (void) stopAnimation;
-- (void) terminate;
 - (void) drawView:(id)sender;
-- (NSString*)getError;
 
 @end
diff --git a/Common/NativeApp/Apple/Source/Classes/iOS/EAGLView.m b/Common/NativeApp/Apple/Source/Classes/iOS/EAGLView.m
index 9120e99..ff02820 100644
--- a/Common/NativeApp/Apple/Source/Classes/iOS/EAGLView.m
+++ b/Common/NativeApp/Apple/Source/Classes/iOS/EAGLView.m
@@ -8,17 +8,11 @@
 
 #import "EAGLView.h"
 
-#include "NativeAppBase.h"
-#include <memory>
-#include <string>
+#include "DeviceCaps.h"
 
 @interface EAGLView ()
 {
-    std::unique_ptr<Diligent::NativeAppBase> _theApp;
     EAGLContext* _context;
-    NSInteger _animationFrameInterval;
-    CADisplayLink* _displayLink;
-    std::string _error;
 }
 @end
 
@@ -32,166 +26,49 @@
 
 // The GL view is stored in the storyboard file. When it's unarchived it's sent -initWithCoder:
 - (instancetype) initWithCoder:(NSCoder*)coder
-{    
+{
     if ((self = [super initWithCoder:coder]))
 	{
         // Get the layer
         CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
-        
+
         eaglLayer.opaque = TRUE;
         eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
                                         [NSNumber numberWithBool:FALSE], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat, nil];
-		
-		
+
 		_context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES3];
-        
+
         if (!_context || ![EAGLContext setCurrentContext:_context])
 		{
             return nil;
 		}
-		
-        try
-        {
-            _theApp.reset(Diligent::CreateApplication());
-            // Init our renderer.
-            _theApp->OnGLContextCreated((__bridge void*)self.layer);
-        }
-        catch(std::runtime_error &err)
-        {
-            _error = err.what();
-            _theApp.reset();
-        }
-        
-		_animating = FALSE;
-		_animationFrameInterval = 1;
-		_displayLink = nil;
+
+        [self initApp:(int)Diligent::DeviceType::OpenGLES];
     }
-	
+
     return self;
 }
 
 - (void) drawView:(id)sender
-{   
-	[EAGLContext setCurrentContext:_context];
-    if(_theApp)
+{
+    [EAGLContext setCurrentContext:_context];
+ 
+    // There is no autorelease pool when this method is called
+    // because it will be called from a background thread.
+    // It's important to create one or app can leak objects.
+    @autoreleasepool
     {
-        _theApp->Update();
-        _theApp->Render();
-        _theApp->Present();
+        [self render];
     }
 }
 
-- (void) layoutSubviews
-{
-    if(_theApp)
-        _theApp->WindowResize(0, 0);
-    [self drawView:nil];
-}
-
-- (NSInteger) animationFrameInterval
-{
-	return _animationFrameInterval;
-}
-
-- (void) setAnimationFrameInterval:(NSInteger)frameInterval
-{
-	// Frame interval defines how many display frames must pass between each time the
-	// display link fires. The display link will only fire 30 times a second when the
-	// frame internal is two on a display that refreshes 60 times a second. The default
-	// frame interval setting of one will fire 60 times a second when the display refreshes
-	// at 60 times a second. A frame interval setting of less than one results in undefined
-	// behavior.
-	if (frameInterval >= 1)
-	{
-		_animationFrameInterval = frameInterval;
-		
-		if (_animating)
-		{
-			[self stopAnimation];
-			[self startAnimation];
-		}
-	}
-}
-
-- (void) startAnimation
-{
-	if (!_animating)
-	{
-        // Create the display link and set the callback to our drawView method
-        _displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(drawView:)];
-
-        // Set it to our _animationFrameInterval
-        [_displayLink setFrameInterval:_animationFrameInterval];
-
-        // Have the display link run on the default runn loop (and the main thread)
-        [_displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
-		
-		_animating = TRUE;
-	}
-}
-
-- (void)stopAnimation
-{
-	if (_animating)
-	{
-        [_displayLink invalidate];
-        _displayLink = nil;		
-		_animating = FALSE;
-	}
-}
-
-- (void)terminate
-{
-    _theApp.reset();
-}
-
 - (void) dealloc
 {
     [self terminate];
 
 	// tear down context
-	if ([EAGLContext currentContext] == _context)
+    if ([EAGLContext currentContext] == _context)
         [EAGLContext setCurrentContext:nil];
 }
 
-- (NSString*)getError
-{
-    return _error.empty() ? nil : [NSString stringWithFormat:@"%s", _error.c_str()];
-}
-
-- (void)touchesBegan:(NSSet<UITouch *> *)touches
-           withEvent:(UIEvent *)event;
-{
-    UITouch *firstTouch = touches.allObjects[0];
-    CGPoint location = [firstTouch locationInView:self];
-    if(_theApp)
-        _theApp->OnTouchBegan(location.x, location.y);
-}
-
-- (void)touchesMoved:(NSSet<UITouch *> *)touches
-           withEvent:(UIEvent *)event;
-{
-    UITouch *firstTouch = touches.allObjects[0];
-    CGPoint location = [firstTouch locationInView:self];
-    if(_theApp)
-        _theApp->OnTouchMoved(location.x, location.y);
-}
-
-- (void)touchesEnded:(NSSet<UITouch *> *)touches
-           withEvent:(UIEvent *)event;
-{
-    UITouch *firstTouch = touches.allObjects[0];
-    CGPoint location = [firstTouch locationInView:self];
-    if(_theApp)
-        _theApp->OnTouchEnded(location.x, location.y);}
-
-- (void)touchesCancelled:(NSSet<UITouch *> *)touches
-               withEvent:(UIEvent *)event;
-{
-    UITouch *firstTouch = touches.allObjects[0];
-    CGPoint location = [firstTouch locationInView:self];
-    if(_theApp)
-        _theApp->OnTouchEnded(location.x, location.y);
-}
-
 @end
diff --git a/Common/NativeApp/Apple/Source/Classes/iOS/MetalView.h b/Common/NativeApp/Apple/Source/Classes/iOS/MetalView.h
new file mode 100644
index 0000000..a485b27
--- /dev/null
+++ b/Common/NativeApp/Apple/Source/Classes/iOS/MetalView.h
@@ -0,0 +1,7 @@
+#import "AppViewBase.h"
+
+@interface MetalView : AppViewBase
+
+- (void) drawView:(id)sender;
+
+@end
diff --git a/Common/NativeApp/Apple/Source/Classes/iOS/MetalView.m b/Common/NativeApp/Apple/Source/Classes/iOS/MetalView.m
new file mode 100644
index 0000000..3c8b198
--- /dev/null
+++ b/Common/NativeApp/Apple/Source/Classes/iOS/MetalView.m
@@ -0,0 +1,39 @@
+#import "MetalView.h"
+#import <QuartzCore/CAMetalLayer.h>
+
+#include "DeviceCaps.h"
+
+@implementation MetalView
+
++ (Class) layerClass
+{
+    return [CAMetalLayer class];
+}
+
+- (instancetype) initWithCoder:(NSCoder*)coder
+{
+    if ((self = [super initWithCoder:coder]))
+	{
+        [self initApp:(int)Diligent::DeviceType::Vulkan];
+    }
+	
+    return self;
+}
+
+- (void) drawView:(id)sender
+{
+    // There is no autorelease pool when this method is called
+    // because it will be called from a background thread.
+    // It's important to create one or app can leak objects.
+    @autoreleasepool
+    {
+        [self render];
+    }
+}
+
+- (void) dealloc
+{
+    [self terminate];
+}
+
+@end
diff --git a/Common/NativeApp/Apple/Source/Classes/iOS/ModeSelectionViewController.h b/Common/NativeApp/Apple/Source/Classes/iOS/ModeSelectionViewController.h
new file mode 100644
index 0000000..4a08d7d
--- /dev/null
+++ b/Common/NativeApp/Apple/Source/Classes/iOS/ModeSelectionViewController.h
@@ -0,0 +1,29 @@
+/*     Copyright 2015-2019 Egor Yusov
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence),
+ *  contract, or otherwise, unless required by applicable law (such as deliberate
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental,
+ *  or consequential damages of any character arising as a result of this License or
+ *  out of the use or inability to use the software (including but not limited to damages
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and
+ *  all other commercial damages or losses), even if such Contributor has been advised
+ *  of the possibility of such damages.
+ */
+
+#import <UIKit/UIKit.h>
+
+@interface ModeSelectionViewController : UIViewController
+{
+}
+@end
diff --git a/Common/NativeApp/Apple/Source/Classes/iOS/ModeSelectionViewController.mm b/Common/NativeApp/Apple/Source/Classes/iOS/ModeSelectionViewController.mm
new file mode 100644
index 0000000..8958c10
--- /dev/null
+++ b/Common/NativeApp/Apple/Source/Classes/iOS/ModeSelectionViewController.mm
@@ -0,0 +1,64 @@
+/*     Copyright 2015-2019 Egor Yusov
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence),
+ *  contract, or otherwise, unless required by applicable law (such as deliberate
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental,
+ *  or consequential damages of any character arising as a result of this License or
+ *  out of the use or inability to use the software (including but not limited to damages
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and
+ *  all other commercial damages or losses), even if such Contributor has been advised
+ *  of the possibility of such damages.
+ */
+
+#import "ModeSelectionViewController.h"
+#import "BaseView.h"
+#import "AppViewBase.h"
+
+@implementation ModeSelectionViewController
+{
+}
+
+-(void)selectViewController:(NSString*)controllerID
+{
+    auto animating = ((BaseView*)self.view).animating;
+    
+    UIViewController* viewController = [self.storyboard instantiateViewControllerWithIdentifier:controllerID];
+    self.view.window.rootViewController = viewController;
+    
+    NSString *error = [(AppViewBase*)viewController.view getError];
+    if(error != nil)
+    {
+        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failed to start the application" message:error delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"Whatever", nil];
+        [alert show];
+    }
+    
+    if(animating)
+    {
+        [(BaseView*)viewController.view startAnimation];
+    }
+}
+
+- (IBAction)goOpenGLES:(id)sender
+{
+    [self selectViewController:@"EAGLViewControllerID"];
+}
+
+- (IBAction)goVulkan:(id)sender
+{
+#if VULKAN_SUPPORTED
+    [self selectViewController:@"MetalViewControllerID"];
+#endif
+}
+
+@end
diff --git a/Common/NativeApp/CMakeLists.txt b/Common/NativeApp/CMakeLists.txt
index b01877c..6fa1db4 100644
--- a/Common/NativeApp/CMakeLists.txt
+++ b/Common/NativeApp/CMakeLists.txt
@@ -13,7 +13,7 @@ if(PLATFORM_WIN32)
 
     function(add_win32_app TARGET_NAME SOURCE INCLUDE ASSETS)
         add_executable(${TARGET_NAME} WIN32 ${SOURCE} ${INCLUDE} ${ASSETS})
-        
+
         if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
             # libmingw32 must be included BEFORE NativeAppBase that contains the definition of WinMain.
             # otherwise WinMain will be stripped out of NativeAppBase and will be unresolved.
@@ -192,7 +192,6 @@ elseif(PLATFORM_MACOS)
         if (NOT CORE_VIDEO)
                 message(FATAL_ERROR "CoreVideo is not found")
         endif()
-        target_link_libraries(${TARGET_NAME} PRIVATE )
 
         find_library(METAL_FRAMEWORK Metal)
         if (NOT METAL_FRAMEWORK)
@@ -227,21 +226,32 @@ elseif(PLATFORM_IOS)
         set(APPLE_SOURCE
             ${NATIVE_APP_SOURCE_DIR}/Apple/Source/main.m
             ${NATIVE_APP_SOURCE_DIR}/Apple/Source/Classes/iOS/AppDelegate.m
+            ${NATIVE_APP_SOURCE_DIR}/Apple/Source/Classes/iOS/BaseView.m
             ${NATIVE_APP_SOURCE_DIR}/Apple/Source/Classes/iOS/EAGLView.m
+            ${NATIVE_APP_SOURCE_DIR}/Apple/Source/Classes/iOS/AppViewBase.m
+            ${NATIVE_APP_SOURCE_DIR}/Apple/Source/Classes/iOS/ModeSelectionViewController.mm
+            ${NATIVE_APP_SOURCE_DIR}/Apple/Source/Classes/iOS/MetalView.m
         )
+
         set_source_files_properties(${APPLE_SOURCE} PROPERTIES
             COMPILE_FLAGS "-x objective-c++"
         )
 
         set(APPLE_INCLUDE
             ${NATIVE_APP_SOURCE_DIR}/Apple/Source/Classes/iOS/AppDelegate.h
+            ${NATIVE_APP_SOURCE_DIR}/Apple/Source/Classes/iOS/BaseView.h
             ${NATIVE_APP_SOURCE_DIR}/Apple/Source/Classes/iOS/EAGLView.h
+            ${NATIVE_APP_SOURCE_DIR}/Apple/Source/Classes/iOS/AppViewBase.h
+            ${NATIVE_APP_SOURCE_DIR}/Apple/Source/Classes/iOS/ModeSelectionViewController.h
+            ${NATIVE_APP_SOURCE_DIR}/Apple/Source/Classes/iOS/MetalView.h
         )
 
         set(APPLE_RESOURCES
             ${NATIVE_APP_SOURCE_DIR}/Apple/Data/iOS/Base.lproj/Main.storyboard
             ${NATIVE_APP_SOURCE_DIR}/Apple/Data/iOS/Base.lproj/LaunchScreen.xib
             ${NATIVE_APP_SOURCE_DIR}/Apple/Data/iOS/Images.xcassets/AppIcon.appiconset/dg-icon.png
+            ${NATIVE_APP_SOURCE_DIR}/Apple/Data/iOS/Images.xcassets/opengles-logo.png
+            ${NATIVE_APP_SOURCE_DIR}/Apple/Data/iOS/Images.xcassets/vulkan-logo.png
         )
 
         set(APPLE_INFO_PLIST
@@ -267,13 +277,13 @@ elseif(PLATFORM_IOS)
         target_include_directories(${TARGET_NAME} PRIVATE ${APPLE_INCLUDE_DIRS})
 
         find_library(OPENGLES OpenGLES)
-            if (NOT OPENGLES)
-                message(FATAL_ERROR "OpenGLES is not found")
-            endif()
+        if (NOT OPENGLES)
+            message(FATAL_ERROR "OpenGLES is not found")
+        endif()
 
         find_library(UIKIT UIKit)
         if (NOT UIKIT)
-                message(FATAL_ERROR "UIKIT is not found")
+            message(FATAL_ERROR "UIKIT is not found")
         endif()
 
         find_library(CORE_ANIMATION QuartzCore)
@@ -309,7 +319,7 @@ PUBLIC
 
 if(MSVC)
     target_compile_options(NativeAppBase PRIVATE -DUNICODE)
-    
+
     if(PLATFORM_UNIVERSAL_WINDOWS)
         # Disable w4189: local variable is initialized but not referenced
         # Disable w4063: case is not a valid value for switch of enum
@@ -332,7 +342,7 @@ if(PLATFORM_WIN32)
     )
 
 elseif(PLATFORM_UNIVERSAL_WINDOWS)
-    
+
     target_include_directories(NativeAppBase 
     PUBLIC 
         include/UWP 
diff --git a/Common/NativeApp/include/IOS/IOSAppBase.h b/Common/NativeApp/include/IOS/IOSAppBase.h
index 2efe4ab..847052a 100644
--- a/Common/NativeApp/include/IOS/IOSAppBase.h
+++ b/Common/NativeApp/include/IOS/IOSAppBase.h
@@ -34,7 +34,7 @@ class IOSAppBase : public AppBase
 public:
     using AppBase::Update;
     void Update();
-    virtual void OnGLContextCreated(void* eaglLayer) = 0;
+    virtual void Initialize(int deviceType, void* layer) = 0;
     virtual void OnTouchBegan(float x, float y){}
     virtual void OnTouchMoved(float x, float y){}
     virtual void OnTouchEnded(float x, float y){}