common: Add C++ version of Apple authorization logic. (#6616)

CMakeLists.txt

@@ -13,15 +13,12 @@ include(CMakeDependentOption)
 
 project(citra LANGUAGES C CXX ASM)
 
-if (APPLE)
-    enable_language(OBJC)
 if (IOS)
     # Enable searching CMAKE_PREFIX_PATH for bundled dependencies.
     set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)
     set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)
     set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE BOTH)
 endif()
-endif()
 
 option(ENABLE_LTO "Enable link time optimization" OFF)
 
@@ -73,10 +70,6 @@ if (CITRA_USE_PRECOMPILED_HEADERS)
         message(WARNING "Buildcache does not properly support Precompiled Headers. Disabling PCH")
         set(CITRA_USE_PRECOMPILED_HEADERS OFF)
     endif()
-    if(APPLE)
-        message(WARNING "Precompiled Headers currently do not work on Apple. Disabling PCH")
-        set(CITRA_USE_PRECOMPILED_HEADERS OFF)
-    endif()
 endif()
 if (CITRA_USE_PRECOMPILED_HEADERS)
     message(STATUS "Using Precompiled Headers.")

src/citra_qt/CMakeLists.txt

@@ -254,12 +254,7 @@ if (APPLE)
         "${DIST_DIR}/LaunchScreen.storyboard"
         "${DIST_DIR}/launch_logo.png"
     )
-
-    target_sources(citra-qt PRIVATE
-        ${APPLE_RESOURCES}
-        macos_authorization.h
-        macos_authorization.mm
-    )
+    target_sources(citra-qt PRIVATE ${APPLE_RESOURCES})
 
     # Define app bundle metadata.
     include(GenerateBuildInfo)

src/citra_qt/camera/qt_multimedia_camera.cpp

@@ -10,7 +10,7 @@
 #include "citra_qt/main.h"
 
 #if defined(__APPLE__)
-#include "citra_qt/macos_authorization.h"
+#include "common/apple_authorization.h"
 #endif
 
 namespace Camera {

src/citra_qt/configuration/configure_audio.cpp

@@ -14,7 +14,7 @@
 #include "ui_configure_audio.h"
 
 #if defined(__APPLE__)
-#include "citra_qt/macos_authorization.h"
+#include "common/apple_authorization.h"
 #endif
 
 ConfigureAudio::ConfigureAudio(QWidget* parent)

src/citra_qt/configuration/configure_camera.cpp

@@ -16,7 +16,7 @@
 #include "ui_configure_camera.h"
 
 #if defined(__APPLE__)
-#include "citra_qt/macos_authorization.h"
+#include "common/apple_authorization.h"
 #endif
 
 const std::array<std::string, 3> ConfigureCamera::Implementations = {
@@ -264,6 +264,9 @@ void ConfigureCamera::SetConfiguration() {
         }
     }
     if (camera_name[index] == "qt") {
+#ifdef __APPLE__
+        AppleAuthorization::CheckAuthorizationForCamera();
+#endif
         ui->system_camera->setCurrentIndex(0);
         if (!camera_config[index].empty()) {
             ui->system_camera->setCurrentText(QString::fromStdString(camera_config[index]));

src/citra_qt/macos_authorization.mm

@@ -1,93 +0,0 @@
-// Copyright 2020 Citra Emulator Project
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#import <AVFoundation/AVFoundation.h>
-
-#include "citra_qt/macos_authorization.h"
-#include "common/logging/log.h"
-
-namespace AppleAuthorization {
-
-static bool authorized_camera = false;
-static bool authorized_microphone = false;
-
-static bool authorized = false;
-
-enum class AuthMediaType { Camera, Microphone };
-
-// Based on
-// https://developer.apple.com/documentation/avfoundation/cameras_and_media_capture/requesting_authorization_for_media_capture_on_macos
-// TODO: This could be rewritten to return the authorization state, having pure c++ code deal with
-// it, log information and possibly wait for the camera access request.
-void CheckAuthorization(AuthMediaType type) {
-    authorized = false;
-    if (@available(macOS 10.14, *)) {
-        NSString* media_type;
-        if (type == AuthMediaType::Camera) {
-            media_type = AVMediaTypeVideo;
-        } else {
-            media_type = AVMediaTypeAudio;
-        }
-
-        // Request permission to access the camera and microphone.
-        switch ([AVCaptureDevice authorizationStatusForMediaType:media_type]) {
-        case AVAuthorizationStatusAuthorized:
-            // The user has previously granted access to the camera.
-            authorized = true;
-            break;
-        case AVAuthorizationStatusNotDetermined: {
-            // The app hasn't yet asked the user for camera access.
-            [AVCaptureDevice requestAccessForMediaType:media_type
-                                     completionHandler:^(BOOL granted) {
-                                       authorized = granted;
-                                     }];
-            if (type == AuthMediaType::Camera) {
-                LOG_INFO(Frontend, "Camera access requested.");
-            } else { // AuthMediaType::Microphone
-                LOG_INFO(Frontend, "Microphone access requested.");
-            }
-            break;
-        }
-        case AVAuthorizationStatusDenied: {
-            // The user has previously denied access.
-            authorized = false;
-            if (type == AuthMediaType::Camera) {
-                LOG_WARNING(Frontend, "Camera access denied. To change this you may modify the "
-                                      "macOS system permission settings "
-                                      "for Citra at 'System Preferences -> Security & Privacy'");
-            } else { // AuthMediaType::Microphone
-                LOG_WARNING(Frontend, "Microphone access denied. To change this you may modify the "
-                                      "macOS system permission settings "
-                                      "for Citra at 'System Preferences -> Security & Privacy'");
-            }
-            return;
-        }
-        case AVAuthorizationStatusRestricted: {
-            // The user can't grant access due to restrictions.
-            authorized = false;
-            return;
-        }
-        }
-    } else {
-        authorized = true;
-    }
-}
-
-bool CheckAuthorizationForCamera() {
-    if (!authorized_camera) {
-        CheckAuthorization(AuthMediaType::Camera);
-        authorized_camera = authorized;
-    }
-    return authorized_camera;
-}
-
-bool CheckAuthorizationForMicrophone() {
-    if (!authorized_microphone) {
-        CheckAuthorization(AuthMediaType::Microphone);
-        authorized_microphone = authorized;
-    }
-    return authorized_microphone;
-}
-
-} // namespace AppleAuthorization

src/citra_qt/main.cpp

@@ -96,7 +96,7 @@
 #include "video_core/video_core.h"
 
 #ifdef __APPLE__
-#include "macos_authorization.h"
+#include "common/apple_authorization.h"
 #endif
 
 #ifdef USE_DISCORD_PRESENCE

src/common/CMakeLists.txt

@@ -138,6 +138,13 @@ add_library(citra_common STATIC
     zstd_compression.h
 )
 
+if (APPLE)
+    target_sources(citra_common PUBLIC
+        apple_authorization.h
+        apple_authorization.cpp
+    )
+endif()
+
 if (MSVC)
   target_compile_options(citra_common PRIVATE
     /W4

src/common/apple_authorization.cpp

@@ -0,0 +1,83 @@
+// Copyright 2023 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <future>
+#include <objc/message.h>
+#include "common/apple_authorization.h"
+#include "common/logging/log.h"
+
+namespace AppleAuthorization {
+
+// Bindings to Objective-C APIs
+
+using NSString = void;
+using AVMediaType = NSString*;
+enum AVAuthorizationStatus : int {
+    AVAuthorizationStatusNotDetermined = 0,
+    AVAuthorizationStatusRestricted,
+    AVAuthorizationStatusDenied,
+    AVAuthorizationStatusAuthorized,
+};
+
+typedef NSString* (*send_stringWithUTF8String)(Class, SEL, const char*);
+typedef AVAuthorizationStatus (*send_authorizationStatusForMediaType)(Class, SEL, AVMediaType);
+typedef void (*send_requestAccessForMediaType_completionHandler)(Class, SEL, AVMediaType,
+                                                                 void (^callback)(bool));
+
+NSString* StringToNSString(const std::string_view string) {
+    return reinterpret_cast<send_stringWithUTF8String>(objc_msgSend)(
+        objc_getClass("NSString"), sel_registerName("stringWithUTF8String:"), string.data());
+}
+
+AVAuthorizationStatus GetAuthorizationStatus(AVMediaType media_type) {
+    return reinterpret_cast<send_authorizationStatusForMediaType>(objc_msgSend)(
+        objc_getClass("AVCaptureDevice"), sel_registerName("authorizationStatusForMediaType:"),
+        media_type);
+}
+
+void RequestAccess(AVMediaType media_type, void (^callback)(bool)) {
+    reinterpret_cast<send_requestAccessForMediaType_completionHandler>(objc_msgSend)(
+        objc_getClass("AVCaptureDevice"),
+        sel_registerName("requestAccessForMediaType:completionHandler:"), media_type, callback);
+}
+
+static AVMediaType AVMediaTypeAudio = StringToNSString("soun");
+static AVMediaType AVMediaTypeVideo = StringToNSString("vide");
+
+// Authorization Logic
+
+bool CheckAuthorization(AVMediaType type, const std::string_view& type_name) {
+    switch (GetAuthorizationStatus(type)) {
+    case AVAuthorizationStatusNotDetermined: {
+        LOG_INFO(Frontend, "Requesting {} permission.", type_name);
+        __block std::promise<bool> authorization_promise;
+        std::future<bool> authorization_future = authorization_promise.get_future();
+        RequestAccess(type, ^(bool granted) {
+          LOG_INFO(Frontend, "{} permission request result: {}", type_name, granted);
+          authorization_promise.set_value(granted);
+        });
+        return authorization_future.get();
+    }
+    case AVAuthorizationStatusAuthorized:
+        return true;
+    case AVAuthorizationStatusDenied:
+        LOG_WARNING(Frontend,
+                    "{} permission has been denied and must be enabled via System Settings.",
+                    type_name);
+        return false;
+    case AVAuthorizationStatusRestricted:
+        LOG_WARNING(Frontend, "{} permission is restricted by the system.", type_name);
+        return false;
+    }
+}
+
+bool CheckAuthorizationForCamera() {
+    return CheckAuthorization(AVMediaTypeVideo, "Camera");
+}
+
+bool CheckAuthorizationForMicrophone() {
+    return CheckAuthorization(AVMediaTypeAudio, "Microphone");
+}
+
+} // namespace AppleAuthorization

src/common/apple_authorization.h

@@ -1,4 +1,4 @@
-// Copyright 2020 Citra Emulator Project
+// Copyright 2023 Citra Emulator Project
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.