Get Vulkan rendering on iOS (still, need to hook up input etc)

CMakeLists.txt

@@ -140,6 +140,8 @@ if(IOS_APP_STORE)
 	# Set a global default to not generate schemes for each target.
 	# Makes using XCode sligthly more sane.
 	set(CMAKE_XCODE_GENERATE_SCHEME NO)
+	set(CMAKE_XCODE_SCHEME_ENABLE_GPU_API_VALIDATION FALSE)
+	set(CMAKE_XCODE_SCHEME_ENABLE_GPU_FRAME_CAPTURE_MODE DISABLED)
 	message("iOS App Store build")
 else()
 	message("iOS sideload build")

Common/GPU/Vulkan/VulkanContext.cpp

@@ -183,6 +183,11 @@ VkResult VulkanContext::CreateInstance(const CreateInfo &info) {
 	if (EnableInstanceExtension(VK_EXT_SWAPCHAIN_COLOR_SPACE_EXTENSION_NAME, 0)) {
 		extensionsLookup_.EXT_swapchain_colorspace = true;
 	}
+#if PPSSPP_PLATFORM(IOS_APP_STORE)
+	if (EnableInstanceExtension(VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME, 0)) {
+
+	}
+#endif
 
 	// Validate that all the instance extensions we ask for are actually available.
 	for (auto ext : instance_extensions_enabled_) {
@@ -206,6 +211,10 @@ VkResult VulkanContext::CreateInstance(const CreateInfo &info) {
 	inst_info.enabledExtensionCount = (uint32_t)instance_extensions_enabled_.size();
 	inst_info.ppEnabledExtensionNames = instance_extensions_enabled_.size() ? instance_extensions_enabled_.data() : nullptr;
 
+#if PPSSPP_PLATFORM(IOS_APP_STORE)
+	inst_info.flags |= VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR;
+#endif
+
 #if SIMULATE_VULKAN_FAILURE == 2
 	VkResult res = VK_ERROR_INCOMPATIBLE_DRIVER;
 #else
@@ -896,7 +905,7 @@ VkResult VulkanContext::ReinitSurface() {
 		surface_ = VK_NULL_HANDLE;
 	}
 
-	INFO_LOG(G3D, "Creating Vulkan surface for window (%p %p)", winsysData1_, winsysData2_);
+	INFO_LOG(G3D, "Creating Vulkan surface for window (data1=%p data2=%p)", winsysData1_, winsysData2_);
 
 	VkResult retval = VK_SUCCESS;
 
@@ -1311,7 +1320,11 @@ bool VulkanContext::InitSwapchain() {
 	VkExtent2D currentExtent { surfCapabilities_.currentExtent };
 	// https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VkSurfaceCapabilitiesKHR.html
 	// currentExtent is the current width and height of the surface, or the special value (0xFFFFFFFF, 0xFFFFFFFF) indicating that the surface size will be determined by the extent of a swapchain targeting the surface.
-	if (currentExtent.width == 0xFFFFFFFFu || currentExtent.height == 0xFFFFFFFFu) {
+	if (currentExtent.width == 0xFFFFFFFFu || currentExtent.height == 0xFFFFFFFFu
+#if PPSSPP_PLATFORM(IOS)
+		|| currentExtent.width == 0 || currentExtent.height == 0
+#endif
+		) {
 		_dbg_assert_((bool)cbGetDrawSize_)
 		if (cbGetDrawSize_) {
 			currentExtent = cbGetDrawSize_();

Common/GPU/Vulkan/VulkanLoader.h

@@ -33,6 +33,7 @@
 
 #if !PPSSPP_PLATFORM(IOS_APP_STORE)
 #define VK_NO_PROTOTYPES
+#define VK_ENABLE_BETA_EXTENSIONS				1		// VK_KHR_portability_subset
 #endif
 
 #include "ext/vulkan/vulkan.h"

ios/AppDelegate.mm

@@ -1,5 +1,6 @@
 #import "AppDelegate.h"
 #import "ViewController.h"
+#import "ViewControllerMetal.h"
 #import "iOSCoreAudio.h"
 #import "Common/System/System.h"
 #import "Common/System/NativeApp.h"
@@ -91,17 +92,25 @@
 
 	self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
 
-	PPSSPPViewControllerGL *vc = [[PPSSPPViewControllerGL alloc] init];
-	// Here we can switch viewcontroller depending on backend.
-	self.viewController = vc;
+	// Choose viewcontroller depending on backend.
+	if (g_Config.iGPUBackend == (int)GPUBackend::VULKAN) {
+		PPSSPPViewControllerMetal *vc = [[PPSSPPViewControllerMetal alloc] init];
+
+		self.viewController = vc;
+		self.window.rootViewController = vc;
+
+	} else {
+		PPSSPPViewControllerGL *vc = [[PPSSPPViewControllerGL alloc] init];
+		// Here we can switch viewcontroller depending on backend.
+		self.viewController = vc;
+		self.window.rootViewController = vc;
+	}
+
+	[self.window makeKeyAndVisible];
 
 	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleAudioSessionInterruption:) name:AVAudioSessionInterruptionNotification object:[AVAudioSession sharedInstance]];
-
 	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleMediaServicesWereReset:) name:AVAudioSessionMediaServicesWereResetNotification object:nil];
 
-	self.window.rootViewController = vc;
-	[self.window makeKeyAndVisible];
-
 	return YES;
 }
 

ios/DisplayManager.mm

@@ -133,18 +133,11 @@
 }
 
 - (void)updateResolution:(UIScreen *)screen {
-	float scale = screen.scale;
-	
-	if ([screen respondsToSelector:@selector(nativeScale)]) {
-		scale = screen.nativeScale;
-	}
-	
+	float scale = screen.nativeScale;
 	CGSize size = screen.bounds.size;
 	
 	if (size.height > size.width) {
-		float h = size.height;
-		size.height = size.width;
-		size.width = h;
+		std::swap(size.height, size.width);
 	}
 
 	if (screen == [UIScreen mainScreen]) {
@@ -159,10 +152,10 @@
 	g_display.dpi_scale_real_y = g_display.dpi_scale_y;
 	g_display.pixel_xres = size.width * scale;
 	g_display.pixel_yres = size.height * scale;
-	
+
 	g_display.dp_xres = g_display.pixel_xres * g_display.dpi_scale_x;
 	g_display.dp_yres = g_display.pixel_yres * g_display.dpi_scale_y;
-	
+
 	g_display.pixel_in_dps_x = (float)g_display.pixel_xres / (float)g_display.dp_xres;
 	g_display.pixel_in_dps_y = (float)g_display.pixel_yres / (float)g_display.dp_yres;
 	
@@ -171,7 +164,7 @@
 	// PSP native resize
 	PSP_CoreParameter().pixelWidth = g_display.pixel_xres;
 	PSP_CoreParameter().pixelHeight = g_display.pixel_yres;
-	
+
 	NativeResized();
 	
 	NSLog(@"Updated display resolution: (%d, %d) @%.1fx", g_display.pixel_xres, g_display.pixel_yres, scale);

ios/ViewController.h

@@ -3,6 +3,7 @@
 #import <UIKit/UIKit.h>
 #import <GLKit/GLKit.h>
 #import <GameController/GameController.h>
+
 #import "iCade/iCadeReaderView.h"
 #import "CameraHelper.h"
 #import "LocationHelper.h"
@@ -13,5 +14,3 @@
     iCadeEventDelegate, LocationHandlerDelegate, CameraFrameDelegate,
     UIGestureRecognizerDelegate, UIKeyInput, PPSSPPViewController>
 @end
-
-extern id <PPSSPPViewController> sharedViewController;

ios/ViewController.mm

@@ -93,15 +93,13 @@ static bool threadStopped = false;
 
 id<PPSSPPViewController> sharedViewController;
 
-// TODO: Reach these through sharedViewController
-static CameraHelper *cameraHelper;
-
 @interface PPSSPPViewControllerGL () {
 	ICadeTracker g_iCadeTracker;
 	TouchTracker g_touchTracker;
 
 	GraphicsContext *graphicsContext;
 	LocationHelper *locationHelper;
+	CameraHelper *cameraHelper;
 }
 
 @property (nonatomic, strong) EAGLContext* context;

ios/ViewControllerCommon.h

@@ -17,3 +17,5 @@
 - (void)stopVideo;
 
 @end
+
+extern id <PPSSPPViewController> sharedViewController;

ios/ViewControllerMetal.h

@@ -1,3 +1,18 @@
 // ViewControllerMetal
 // Used by both Vulkan/MoltenVK and the future Metal backend.
 
+#pragma once
+#include "ViewControllerCommon.h"
+
+#import "iCade/iCadeReaderView.h"
+#import "CameraHelper.h"
+#import "LocationHelper.h"
+
+@interface PPSSPPViewControllerMetal : UIViewController<
+    iCadeEventDelegate, LocationHandlerDelegate, CameraFrameDelegate,
+    UIGestureRecognizerDelegate, UIKeyInput, PPSSPPViewController>
+@end
+
+/** The Metal-compatibile view. */
+@interface PPSSPPMetalView : UIView
+@end

ios/ViewControllerMetal.mm

@@ -1 +1,514 @@
-#include "ViewControllerMetal.h"
+#import "AppDelegate.h"
+#import "ViewControllerMetal.h"
+#import "DisplayManager.h"
+#include "Controls.h"
+#import "iOSCoreAudio.h"
+
+#include "Common/Log.h"
+
+#include "Common/GPU/Vulkan/VulkanLoader.h"
+#include "Common/GPU/Vulkan/VulkanContext.h"
+#include "Common/GPU/Vulkan/VulkanRenderManager.h"
+#include "Common/GPU/thin3d.h"
+#include "Common/GPU/thin3d_create.h"
+#include "Common/Data/Text/Parsers.h"
+#include "Common/Data/Encoding/Utf8.h"
+#include "Common/System/Display.h"
+#include "Common/System/System.h"
+#include "Common/System/OSD.h"
+#include "Common/System/NativeApp.h"
+#include "Common/GraphicsContext.h"
+#include "Common/Thread/ThreadUtil.h"
+
+#include "Core/Config.h"
+#include "Core/ConfigValues.h"
+#include "Core/System.h"
+
+// TODO: Share this between backends.
+static uint32_t FlagsFromConfig() {
+	uint32_t flags;
+	if (g_Config.bVSync) {
+		flags = VULKAN_FLAG_PRESENT_FIFO;
+	} else {
+		flags = VULKAN_FLAG_PRESENT_MAILBOX | VULKAN_FLAG_PRESENT_IMMEDIATE;
+	}
+	return flags;
+}
+
+enum class GraphicsContextState {
+	PENDING,
+	INITIALIZED,
+	FAILED_INIT,
+	SHUTDOWN,
+};
+
+class IOSVulkanContext : public GraphicsContext {
+public:
+	IOSVulkanContext();
+	~IOSVulkanContext() {
+		delete g_Vulkan;
+		g_Vulkan = nullptr;
+	}
+
+	bool InitAPI();
+
+	bool InitFromRenderThread(CAMetalLayer *layer, int desiredBackbufferSizeX, int desiredBackbufferSizeY);
+	void ShutdownFromRenderThread();  // Inverses InitFromRenderThread.
+
+	void Shutdown();
+	void Resize();
+
+	void *GetAPIContext() { return g_Vulkan; }
+	Draw::DrawContext *GetDrawContext() { return draw_; }
+
+private:
+	VulkanContext *g_Vulkan = nullptr;
+	Draw::DrawContext *draw_ = nullptr;
+	GraphicsContextState state_ = GraphicsContextState::PENDING;
+};
+
+IOSVulkanContext::IOSVulkanContext() {}
+
+bool IOSVulkanContext::InitFromRenderThread(CAMetalLayer *layer, int desiredBackbufferSizeX, int desiredBackbufferSizeY) {
+	INFO_LOG(G3D, "IOSVulkanContext::InitFromRenderThread: desiredwidth=%d desiredheight=%d", desiredBackbufferSizeX, desiredBackbufferSizeY);
+	if (!g_Vulkan) {
+		ERROR_LOG(G3D, "IOSVulkanContext::InitFromRenderThread: No Vulkan context");
+		return false;
+	}
+
+	VkResult res = g_Vulkan->InitSurface(WINDOWSYSTEM_METAL_EXT, (void *)layer, nullptr);
+	if (res != VK_SUCCESS) {
+		ERROR_LOG(G3D, "g_Vulkan->InitSurface failed: '%s'", VulkanResultToString(res));
+		return false;
+	}
+
+	bool success = true;
+	if (g_Vulkan->InitSwapchain()) {
+		bool useMultiThreading = g_Config.bRenderMultiThreading;
+		if (g_Config.iInflightFrames == 1) {
+			useMultiThreading = false;
+		}
+		draw_ = Draw::T3DCreateVulkanContext(g_Vulkan, useMultiThreading);
+		SetGPUBackend(GPUBackend::VULKAN);
+		success = draw_->CreatePresets();  // Doesn't fail, we ship the compiler.
+		_assert_msg_(success, "Failed to compile preset shaders");
+		draw_->HandleEvent(Draw::Event::GOT_BACKBUFFER, g_Vulkan->GetBackbufferWidth(), g_Vulkan->GetBackbufferHeight());
+
+		VulkanRenderManager *renderManager = (VulkanRenderManager *)draw_->GetNativeObject(Draw::NativeObject::RENDER_MANAGER);
+		renderManager->SetInflightFrames(g_Config.iInflightFrames);
+		success = renderManager->HasBackbuffers();
+	} else {
+		success = false;
+	}
+
+	INFO_LOG(G3D, "IOSVulkanContext::Init completed, %s", success ? "successfully" : "but failed");
+	if (!success) {
+		g_Vulkan->DestroySwapchain();
+		g_Vulkan->DestroySurface();
+		g_Vulkan->DestroyDevice();
+		g_Vulkan->DestroyInstance();
+	}
+	return success;
+}
+
+void IOSVulkanContext::ShutdownFromRenderThread() {
+	INFO_LOG(G3D, "IOSVulkanContext::Shutdown");
+	draw_->HandleEvent(Draw::Event::LOST_BACKBUFFER, g_Vulkan->GetBackbufferWidth(), g_Vulkan->GetBackbufferHeight());
+	delete draw_;
+	draw_ = nullptr;
+	g_Vulkan->WaitUntilQueueIdle();
+	g_Vulkan->PerformPendingDeletes();
+	g_Vulkan->DestroySwapchain();
+	g_Vulkan->DestroySurface();
+	INFO_LOG(G3D, "Done with ShutdownFromRenderThread");
+}
+
+void IOSVulkanContext::Shutdown() {
+	INFO_LOG(G3D, "Calling NativeShutdownGraphics");
+	g_Vulkan->DestroyDevice();
+	g_Vulkan->DestroyInstance();
+	// We keep the g_Vulkan context around to avoid invalidating a ton of pointers around the app.
+	finalize_glslang();
+	INFO_LOG(G3D, "IOSVulkanContext::Shutdown completed");
+}
+
+void IOSVulkanContext::Resize() {
+	INFO_LOG(G3D, "IOSVulkanContext::Resize begin (oldsize: %dx%d)", g_Vulkan->GetBackbufferWidth(), g_Vulkan->GetBackbufferHeight());
+
+	draw_->HandleEvent(Draw::Event::LOST_BACKBUFFER, g_Vulkan->GetBackbufferWidth(), g_Vulkan->GetBackbufferHeight());
+	g_Vulkan->DestroySwapchain();
+	g_Vulkan->DestroySurface();
+
+	g_Vulkan->UpdateFlags(FlagsFromConfig());
+
+	g_Vulkan->ReinitSurface();
+	g_Vulkan->InitSwapchain();
+	draw_->HandleEvent(Draw::Event::GOT_BACKBUFFER, g_Vulkan->GetBackbufferWidth(), g_Vulkan->GetBackbufferHeight());
+	INFO_LOG(G3D, "IOSVulkanContext::Resize end (final size: %dx%d)", g_Vulkan->GetBackbufferWidth(), g_Vulkan->GetBackbufferHeight());
+}
+
+extern const char *PPSSPP_GIT_VERSION;
+
+bool IOSVulkanContext::InitAPI() {
+	INFO_LOG(G3D, "IOSVulkanContext::Init");
+	init_glslang();
+
+	g_LogOptions.breakOnError = true;
+	g_LogOptions.breakOnWarning = true;
+	g_LogOptions.msgBoxOnError = false;
+
+	INFO_LOG(G3D, "Creating Vulkan context");
+	Version gitVer(PPSSPP_GIT_VERSION);
+
+	std::string errorStr;
+	if (!VulkanLoad(&errorStr)) {
+		ERROR_LOG(G3D, "Failed to load Vulkan driver library: %s", errorStr.c_str());
+		state_ = GraphicsContextState::FAILED_INIT;
+		return false;
+	}
+
+	if (!g_Vulkan) {
+		// TODO: Assert if g_Vulkan already exists here?
+		g_Vulkan = new VulkanContext();
+	}
+
+	VulkanContext::CreateInfo info{};
+	info.app_name = "PPSSPP";
+	info.app_ver = gitVer.ToInteger();
+	info.flags = FlagsFromConfig();
+	VkResult res = g_Vulkan->CreateInstance(info);
+	if (res != VK_SUCCESS) {
+		ERROR_LOG(G3D, "Failed to create vulkan context: %s", g_Vulkan->InitError().c_str());
+		VulkanSetAvailable(false);
+		delete g_Vulkan;
+		g_Vulkan = nullptr;
+		state_ = GraphicsContextState::FAILED_INIT;
+		return false;
+	}
+
+	int physicalDevice = g_Vulkan->GetBestPhysicalDevice();
+	if (physicalDevice < 0) {
+		ERROR_LOG(G3D, "No usable Vulkan device found.");
+		g_Vulkan->DestroyInstance();
+		delete g_Vulkan;
+		g_Vulkan = nullptr;
+		state_ = GraphicsContextState::FAILED_INIT;
+		return false;
+	}
+
+	g_Vulkan->ChooseDevice(physicalDevice);
+
+	INFO_LOG(G3D, "Creating Vulkan device (flags: %08x)", info.flags);
+	if (g_Vulkan->CreateDevice() != VK_SUCCESS) {
+		INFO_LOG(G3D, "Failed to create vulkan device: %s", g_Vulkan->InitError().c_str());
+		System_Toast("No Vulkan driver found. Using OpenGL instead.");
+		g_Vulkan->DestroyInstance();
+		delete g_Vulkan;
+		g_Vulkan = nullptr;
+		state_ = GraphicsContextState::FAILED_INIT;
+		return false;
+	}
+
+	g_Vulkan->SetCbGetDrawSize([]() {
+		return VkExtent2D {(uint32_t)g_display.pixel_xres, (uint32_t)g_display.pixel_yres};
+	});
+
+	INFO_LOG(G3D, "Vulkan device created!");
+	state_ = GraphicsContextState::INITIALIZED;
+	return true;
+}
+
+
+#pragma mark -
+#pragma mark PPSSPPViewControllerMetal
+
+static std::atomic<bool> exitRenderLoop;
+static std::atomic<bool> renderLoopRunning;
+static bool renderer_inited = false;
+static std::mutex renderLock;
+
+@interface PPSSPPViewControllerMetal () {
+	ICadeTracker g_iCadeTracker;
+	TouchTracker g_touchTracker;
+
+	IOSVulkanContext *graphicsContext;
+	LocationHelper *locationHelper;
+	CameraHelper *cameraHelper;
+}
+
+@property (nonatomic) GCController *gameController __attribute__((weak_import));
+
+@end  // @interface
+
+@implementation PPSSPPViewControllerMetal 
+
+- (id)init {
+	self = [super init];
+	if (self) {
+		sharedViewController = self;
+		g_iCadeTracker.InitKeyMap();
+
+		[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appWillTerminate:) name:UIApplicationWillTerminateNotification object:nil];
+
+		if ([GCController class]) // Checking the availability of a GameController framework
+		{
+			[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(controllerDidConnect:) name:GCControllerDidConnectNotification object:nil];
+			[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(controllerDidDisconnect:) name:GCControllerDidDisconnectNotification object:nil];
+		}
+	}
+	return self;
+}
+
+// Should be very similar to the Android one, probably mergeable.
+void VulkanRenderLoop(IOSVulkanContext *graphicsContext, CAMetalLayer *metalLayer, int desiredBackbufferSizeX, int desiredBackbufferSizeY) {
+	SetCurrentThreadName("EmuThread");
+
+	if (!graphicsContext) {
+		ERROR_LOG(G3D, "runVulkanRenderLoop: Tried to enter without a created graphics context.");
+		renderLoopRunning = false;
+		exitRenderLoop = false;
+		return;
+	}
+
+	if (exitRenderLoop) {
+		WARN_LOG(G3D, "runVulkanRenderLoop: ExitRenderLoop requested at start, skipping the whole thing.");
+		renderLoopRunning = false;
+		exitRenderLoop = false;
+		return;
+	}
+
+	// This is up here to prevent race conditions, in case we pause during init.
+	renderLoopRunning = true;
+
+	//WARN_LOG(G3D, "runVulkanRenderLoop. desiredBackbufferSizeX=%d desiredBackbufferSizeY=%d",
+	//	desiredBackbufferSizeX, desiredBackbufferSizeY);
+
+	if (!graphicsContext->InitFromRenderThread(metalLayer, desiredBackbufferSizeX, desiredBackbufferSizeY)) {
+		// On Android, if we get here, really no point in continuing.
+		// The UI is supposed to render on any device both on OpenGL and Vulkan. If either of those don't work
+		// on a device, we blacklist it. Hopefully we should have already failed in InitAPI anyway and reverted to GL back then.
+		ERROR_LOG(G3D, "Failed to initialize graphics context.");
+		System_Toast("Failed to initialize graphics context.");
+
+		delete graphicsContext;
+		graphicsContext = nullptr;
+		renderLoopRunning = false;
+		return;
+	}
+
+	if (!exitRenderLoop) {
+		if (!NativeInitGraphics(graphicsContext)) {
+			ERROR_LOG(G3D, "Failed to initialize graphics.");
+			// Gonna be in a weird state here..
+		}
+		graphicsContext->ThreadStart();
+		renderer_inited = true;
+
+		while (!exitRenderLoop) {
+			{
+				std::lock_guard<std::mutex> renderGuard(renderLock);
+				NativeFrame(graphicsContext);
+			}
+			// Here Android processes frame commands.
+		}
+		INFO_LOG(G3D, "Leaving Vulkan main loop.");
+	} else {
+		INFO_LOG(G3D, "Not entering main loop.");
+	}
+
+	NativeShutdownGraphics();
+
+	renderer_inited = false;
+	graphicsContext->ThreadEnd();
+
+	// Shut the graphics context down to the same state it was in when we entered the render thread.
+	INFO_LOG(G3D, "Shutting down graphics context...");
+	graphicsContext->ShutdownFromRenderThread();
+	renderLoopRunning = false;
+	exitRenderLoop = false;
+
+	WARN_LOG(G3D, "Render loop function exited.");
+}
+
+- (void)loadView {
+	INFO_LOG(G3D, "Creating metal view");
+
+	CGRect screenRect = [[UIScreen mainScreen] bounds];
+	CGFloat screenWidth = screenRect.size.width;
+	CGFloat screenHeight = screenRect.size.height;
+
+	PPSSPPMetalView *metalView = [[PPSSPPMetalView alloc] initWithFrame:CGRectMake(0, 0, screenWidth,screenHeight)];
+	self.view = metalView;
+}
+
+- (void)viewDidLoad {
+	[super viewDidLoad];
+	[[DisplayManager shared] setupDisplayListener];
+
+	INFO_LOG(SYSTEM, "Metal viewDidLoad");
+
+	UIScreen* screen = [(AppDelegate*)[UIApplication sharedApplication].delegate screen];
+	self.view.frame = [screen bounds];
+	self.view.multipleTouchEnabled = YES;
+	graphicsContext = new IOSVulkanContext();
+
+	[[DisplayManager shared] updateResolution:[UIScreen mainScreen]];
+
+	if (!graphicsContext->InitAPI()) {
+		_assert_msg_(false, "Failed to init Vulkan");
+	}
+
+	int desiredBackbufferSizeX = g_display.pixel_xres;
+	int desiredBackbufferSizeY = g_display.pixel_yres;
+
+	INFO_LOG(G3D, "Detected size: %dx%d", desiredBackbufferSizeX, desiredBackbufferSizeY);
+	CAMetalLayer *layer = (CAMetalLayer *)self.view.layer;
+
+	[self hideKeyboard];
+
+	// Spin up the emu thread. It will in turn spin up the Vulkan render thread
+	// on its own.
+	dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+		VulkanRenderLoop(graphicsContext, layer, desiredBackbufferSizeX, desiredBackbufferSizeY);
+	});
+}
+
+// Allow device rotation to resize the swapchain
+-(void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id)coordinator {
+	[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
+	// TODO: Handle resizing properly.
+	// demo_resize(&demo);
+}
+
+- (UIView *)getView {
+	return [self view];
+}
+
+/** Since this is a single-view app, initialize Vulkan as view is appearing. */
+- (void)viewWillAppear:(BOOL) animated {
+	[super viewWillAppear: animated];
+
+	self.view.contentScaleFactor = UIScreen.mainScreen.nativeScale;
+
+	uint32_t fps = 60;
+	/*
+	_displayLink = [CADisplayLink displayLinkWithTarget: self selector: @selector(renderLoop)];
+	[_displayLink setFrameInterval: 60 / fps];
+	[_displayLink addToRunLoop: NSRunLoop.currentRunLoop forMode: NSDefaultRunLoopMode];
+	*/
+}
+
+/*
+-(void) renderLoop {
+	demo_draw(&demo);
+}
+*/
+
+- (void)viewDidDisappear: (BOOL) animated {
+	// [_displayLink invalidate];
+	// [_displayLink release];
+	// demo_cleanup(&demo);
+	[super viewDidDisappear: animated];
+}
+
+
+- (BOOL)prefersHomeIndicatorAutoHidden {
+    return YES;
+}
+
+- (void)shareText:(NSString *)text {
+	NSArray *items = @[text];
+	UIActivityViewController * viewController = [[UIActivityViewController alloc] initWithActivityItems:items applicationActivities:nil];
+	dispatch_async(dispatch_get_main_queue(), ^{
+		[self presentViewController:viewController animated:YES completion:nil];
+	});
+}
+
+extern float g_safeInsetLeft;
+extern float g_safeInsetRight;
+extern float g_safeInsetTop;
+extern float g_safeInsetBottom;
+
+- (void)viewSafeAreaInsetsDidChange {
+	if (@available(iOS 11.0, *)) {
+		[super viewSafeAreaInsetsDidChange];
+		// we use 0.0f instead of safeAreaInsets.bottom because the bottom overlay isn't disturbing (for now)
+		g_safeInsetLeft = self.view.safeAreaInsets.left;
+		g_safeInsetRight = self.view.safeAreaInsets.right;
+		g_safeInsetTop = self.view.safeAreaInsets.top;
+		g_safeInsetBottom = 0.0f;
+	}
+}
+
+- (void)bindDefaultFBO
+{
+	// Do nothing
+}
+
+- (void)buttonDown:(iCadeState)button
+{
+	g_iCadeTracker.ButtonDown(button);
+}
+
+- (void)buttonUp:(iCadeState)button
+{
+	g_iCadeTracker.ButtonUp(button);
+}
+
+// The below is inspired by https://stackoverflow.com/questions/7253477/how-to-display-the-iphone-ipad-keyboard-over-a-full-screen-opengl-es-app
+// It's a bit limited but good enough.
+
+-(void) deleteBackward {
+	KeyInput input{};
+	input.deviceId = DEVICE_ID_KEYBOARD;
+	input.flags = KEY_DOWN | KEY_UP;
+	input.keyCode = NKCODE_DEL;
+	NativeKey(input);
+	INFO_LOG(SYSTEM, "Backspace");
+}
+
+-(BOOL) hasText
+{
+	return YES;
+}
+
+-(void) insertText:(NSString *)text
+{
+	std::string str = std::string([text UTF8String]);
+	INFO_LOG(SYSTEM, "Chars: %s", str.c_str());
+	UTF8 chars(str);
+	while (!chars.end()) {
+		uint32_t codePoint = chars.next();
+		KeyInput input{};
+		input.deviceId = DEVICE_ID_KEYBOARD;
+		input.flags = KEY_CHAR;
+		input.unicodeChar = codePoint;
+		NativeKey(input);
+	}
+}
+
+-(BOOL) canBecomeFirstResponder
+{
+	return YES;
+}
+
+-(void) showKeyboard {
+	dispatch_async(dispatch_get_main_queue(), ^{
+		[self becomeFirstResponder];
+	});
+}
+
+-(void) hideKeyboard {
+	dispatch_async(dispatch_get_main_queue(), ^{
+		[self resignFirstResponder];
+	});
+}
+
+@end
+
+@implementation PPSSPPMetalView
+
+/** Returns a Metal-compatible layer. */
++(Class) layerClass { return [CAMetalLayer class]; }
+
+@end