Add files

Configs/Debug.xcconfig

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+//
+//  Debug.xcconfig
+//  MacCast
+//
+//  Created by Saagar Jha on 10/8/23.
+//
+
+#include "Shared.xcconfig"
+
+DEBUG_INFORMATION_FORMAT = dwarf
+ENABLE_TESTABILITY = YES
+GCC_OPTIMIZATION_LEVEL = 0
+GCC_PREPROCESSOR_DEFINITIONS = DEBUG=1 $(inherited)
+MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE
+ONLY_ACTIVE_ARCH = YES
+SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG $(inherited)
+SWIFT_OPTIMIZATION_LEVEL = -Onone
+

Configs/Deployment.xcconfig

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+//
+//  Deployment.xcconfig
+//  MacCast
+//
+//  Created by Saagar Jha on 10/8/23.
+//
+
+CODE_SIGN_IDENTITY = Apple Development
+CURRENT_PROJECT_VERSION = 1
+DEVELOPMENT_TEAM = X4A9GH5NN2
+MACOSX_DEPLOYMENT_TARGET = 14.0
+MARKETING_VERSION = 1.0
+XROS_DEPLOYMENT_TARGET = 1.0

Configs/Release.xcconfig

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+//
+//  Release.xcconfig
+//  MacCast
+//
+//  Created by Saagar Jha on 10/8/23.
+//
+
+#include "Shared.xcconfig"
+
+DEBUG_INFORMATION_FORMAT = dwarf-with-dsym
+ENABLE_NS_ASSERTIONS = NO
+MTL_ENABLE_DEBUG_INFO = NO
+SWIFT_COMPILATION_MODE = wholemodule
+VALIDATE_PRODUCT = YES

Configs/Shared.xcconfig

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+//
+//  Shared.xcconfig
+//  MacCast
+//
+//  Created by Saagar Jha on 10/8/23.
+//
+
+#include "Deployment.xcconfig"
+
+ALWAYS_SEARCH_USER_PATHS = NO
+ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES
+CLANG_ANALYZER_NONNULL = YES
+CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE
+CLANG_CXX_LANGUAGE_STANDARD = gnu++20
+CLANG_ENABLE_MODULES = YES
+CLANG_ENABLE_OBJC_ARC = YES
+CLANG_ENABLE_OBJC_WEAK = YES
+CLANG_WARN__DUPLICATE_METHOD_MATCH = YES
+CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES
+CLANG_WARN_BOOL_CONVERSION = YES
+CLANG_WARN_COMMA = YES
+CLANG_WARN_CONSTANT_CONVERSION = YES
+CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES
+CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR
+CLANG_WARN_DOCUMENTATION_COMMENTS = YES
+CLANG_WARN_EMPTY_BODY = YES
+CLANG_WARN_ENUM_CONVERSION = YES
+CLANG_WARN_INFINITE_RECURSION = YES
+CLANG_WARN_INT_CONVERSION = YES
+CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES
+CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES
+CLANG_WARN_OBJC_LITERAL_CONVERSION = YES
+CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR
+CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES
+CLANG_WARN_RANGE_LOOP_ANALYSIS = YES
+CLANG_WARN_STRICT_PROTOTYPES = YES
+CLANG_WARN_SUSPICIOUS_MOVE = YES
+CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE
+CLANG_WARN_UNREACHABLE_CODE = YES
+COPY_PHASE_STRIP = NO
+ENABLE_PREVIEWS = YES
+ENABLE_STRICT_OBJC_MSGSEND = YES
+ENABLE_USER_SCRIPT_SANDBOXING = YES
+GCC_C_LANGUAGE_STANDARD = gnu17
+GCC_NO_COMMON_BLOCKS = YES
+GCC_WARN_64_TO_32_BIT_CONVERSION = YES
+GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR
+GCC_WARN_UNDECLARED_SELECTOR = YES
+GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE
+GCC_WARN_UNUSED_FUNCTION = YES
+GCC_WARN_UNUSED_VARIABLE = YES
+GENERATE_INFOPLIST_FILE = YES
+LOCALIZATION_PREFERS_STRING_CATALOGS = YES
+MTL_FAST_MATH = YES
+SWIFT_EMIT_LOC_STRINGS = YES
+SWIFT_VERSION = 5.0

Configs/macOS.xcconfig

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+//
+//  macOS.xcconfig
+//  MacCast
+//
+//  Created by Saagar Jha on 10/8/23.
+//
+
+ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon
+CODE_SIGN_ENTITLEMENTS = macOS/MacCast.entitlements
+CODE_SIGN_STYLE = Automatic
+COMBINE_HIDPI_IMAGES = YES
+DEVELOPMENT_ASSET_PATHS = "macOS/Preview Content"
+ENABLE_HARDENED_RUNTIME = YES
+INFOPLIST_KEY_LSApplicationCategoryType = public.app-category.productivity
+LD_RUNPATH_SEARCH_PATHS = $(inherited) @executable_path/../Frameworks
+PRODUCT_BUNDLE_IDENTIFIER = com.saagarjha.MacCast.macOS
+PRODUCT_NAME = MacCast

Configs/visionOS.xcconfig

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+//
+//  visionOS.xcconfig
+//  MacCast
+//
+//  Created by Saagar Jha on 10/8/23.
+//
+
+ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon
+DEVELOPMENT_ASSET_PATHS = "visionOS/Preview Content"
+INFOPLIST_FILE = $(TARGET_NAME)/Info.plist
+LD_RUNPATH_SEARCH_PATHS = $(inherited) @executable_path/Frameworks
+PRODUCT_BUNDLE_IDENTIFIER = com.saagarjha.MacCast.visionOS
+PRODUCT_NAME = MacCast
+SDKROOT = xros
+SUPPORTED_PLATFORMS = xros xrsimulator
+TARGETED_DEVICE_FAMILY = 1,2,7

MacCast.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

MacCast.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

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+{
+  "pins" : [
+    {
+      "identity" : "appleconnect",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/saagarjha/AppleConnect.git",
+      "state" : {
+        "branch" : "main",
+        "revision" : "fc826eca2b50cdec69781c82c4dd03a2d9e51981"
+      }
+    },
+    {
+      "identity" : "cod",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/saagarjha/Cod.git",
+      "state" : {
+        "branch" : "main",
+        "revision" : "9ab61a00a5d9e4d21ed15af36734ea435cb4cf8c"
+      }
+    }
+  ],
+  "version" : 2
+}

README.md

@@ -1,2 +1,11 @@
-# MacCast
-Cast Mac windows to visionOS
+<p align="center">
+<img height="256" src="https://github.com/saagarjha/MacCast/raw/main/macOS/Assets.xcassets/AppIcon.appiconset/icon_512x512%402x.png" />
+</p>
+
+<h1 align="center">MacCast</h1>
+
+MacCast bridges windows from your Mac directly into visionOS, letting you move, resize, and interact with them just like you would with any other native app. It's wireless, like Mac Virtual Display, but without the limitations of resolution or working in a flat plane.
+
+## Status
+
+MacCast is currently "pre-alpha": it's really more of a demo at this point. There's a lot of things I need to work on and until then it is unlikely I will be taking any code contributions. You are welcome to try it out (especially if you have a Vision Pro, as I do not) and file issues or suggestions but you should probably reach out if you are looking for anything beyond that. The code is definitely not designed for general-purpose use yet, so don't expect much of it :)

Shared/Messages.swift

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+//
+//  Messages.swift
+//  MacCast
+//
+//  Created by Saagar Jha on 10/9/23.
+//
+
+enum Messages: UInt8, CaseIterable {
+	static let version = 1
+	case visionOSHandshake
+	case macOSHandshake
+	case windows
+	case windowPreview
+	case startCasting
+	case windowFrame
+}
+
+protocol Message {
+	static var id: Messages { get }
+	associatedtype Request: Serializable
+	associatedtype Reply: Serializable
+}
+
+extension Message {
+	static func send(_ parameters: Request, through connection: Multiplexer) async throws -> Reply {
+		try await .decode(connection.sendWithReply(message: Self.id, data: parameters.encode()))
+	}
+}

Shared/Multiplexer.swift

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+//
+//  Multiplexer.swift
+//  MacCast
+//
+//  Created by Saagar Jha on 10/9/23.
+//
+
+import AppleConnect
+import Foundation
+
+struct Multiplexer {
+	let connection: Connection
+	let localInterface: LocalInterface
+
+	actor Replies {
+		var token: Int = 1
+		var continuations = [Int: CheckedContinuation<Data, Error>]()
+
+		func enqueue(_ continuation: CheckedContinuation<Data, Error>) -> Int {
+			defer {
+				token += 1
+			}
+			continuations[token] = continuation
+			return token
+		}
+
+		func failAll(with error: Error) {
+			for continuation in continuations.values {
+				continuation.resume(throwing: error)
+			}
+			continuations.removeAll()
+		}
+
+		func yield(_ data: Data, forToken token: Int) {
+			let continuation = continuations.removeValue(forKey: token)!
+			continuation.resume(returning: data)
+		}
+	}
+	let replies = Replies()
+
+	init(connection: Connection, localInterface: LocalInterface) {
+		self.connection = connection
+		self.localInterface = localInterface
+		serviceReplies()
+	}
+
+	func serviceReplies() {
+		Task {
+			do {
+				for try await data in connection.data {
+					let message = Messages(rawValue: data.first!)!
+					var data = data.dropFirst()
+					let token = try Int(uleb128: &data)
+					if let data = try await localInterface.handle(message: message, data: data) {
+						try await send(message: message, data: data, token: token)
+					} else {
+						await replies.yield(data, forToken: token)
+					}
+				}
+			} catch {
+				await replies.failAll(with: error)
+			}
+		}
+	}
+
+	func send(message: Messages, data: Data) async throws {
+		try await send(message: message, data: data, token: 0)
+	}
+
+	func sendWithReply(message: Messages, data: Data) async throws -> Data {
+		try await withCheckedThrowingContinuation { continuation in
+			Task {
+				Task {
+					let token = await replies.enqueue(continuation)
+					do {
+						try await send(message: message, data: data, token: token)
+					} catch {
+						continuation.resume(throwing: error)
+					}
+				}
+			}
+		}
+	}
+
+	func send(message: Messages, data: Data, token: Int) async throws {
+		try! await connection.send(data: Data([message.rawValue]) + token.uleb128 + data)
+	}
+}
+
+protocol LocalInterface {
+	func handle(message: Messages, data: Data) async throws -> Data?
+}