Use SDL3 in a way that is xcframework compatible.

.gitignore

@@ -1,6 +1,7 @@
 /build-*
-/xcode-*
+/xcode*
 /.swiftpm
 /.swift
 /.vscode
 /.idea
+.DS_Store

CMakeLists.txt

@@ -5,6 +5,4 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
 include(InitializeSwift)
 include(AddSwift)
 
-find_package(SDL3 CONFIG REQUIRED)
-
 add_subdirectory(Sources)

Sources/SDL3/CMakeLists.txt

@@ -4,4 +4,6 @@ set_property(TARGET SDL3 PROPERTY CXX_STANDARD 20)
 
 target_compile_options(SDL3 PUBLIC "$<$<COMPILE_LANGUAGE:Swift>:-cxx-interoperability-mode=default>")
 target_include_directories(SDL3 PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}")
-target_link_libraries(SDL3 PUBLIC SDL3::SDL3)
+
+find_library(SDL3_LIB SDL3 REQUIRED)
+target_link_libraries(SDL3 PUBLIC ${SDL3_LIB})

Sources/SwiftFrontend/Application.swift

@@ -0,0 +1,58 @@
+//
+//  Application.swift
+//  cxxswift
+//
+//  Created by Alex Zenla on 8/3/24.
+//
+
+import Foundation
+import SDL3
+
+struct Application {
+  func run() -> Int32 {
+    guard SDL_Init(SDL_INIT_VIDEO) >= 0 else {
+      print("SDL init failed.")
+      return 1
+    }
+    
+    defer {
+      SDL_Quit()
+    }
+    
+    guard let window = SDL_CreateWindow("Hello World", 512, 512, 0) else {
+      return 1
+    }
+    
+    defer {
+      SDL_DestroyWindow(window)
+    }
+    
+    let renderer = SDL_CreateRenderer(window, nil)
+    
+    defer {
+      SDL_DestroyRenderer(renderer)
+    }
+    
+    quit: while true {
+      var event = SDL_Event()
+      
+      while SDL_PollEvent(&event) > 0 {
+        switch SDL_EventType(event.type) {
+        case SDL_EVENT_QUIT:
+          break quit
+        default:
+          break
+        }
+      }
+
+      SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255)
+      SDL_RenderClear(renderer)
+      var rect = SDL_FRect(x: 0, y: 0, w: 100, h: 100)
+      SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255)
+      SDL_RenderFillRect(renderer, &rect)
+      SDL_RenderPresent(renderer)
+    }
+    
+    return 0
+  }
+}

Sources/SwiftFrontend/CMakeLists.txt

@@ -1,2 +1,2 @@
-add_executable(SwiftFrontend main.swift)
+add_executable(SwiftFrontend MACOSX_BUNDLE main.swift Application.swift)
 target_link_libraries(SwiftFrontend PRIVATE CppBackend SDL3)

Sources/SwiftFrontend/main.swift

@@ -1,9 +1,4 @@
 import Foundation
 import SDL3
 
-guard SDL_Init(SDL_INIT_VIDEO) >= 0 else {
-    print("SDL init failed.")
-    exit(0)
-}
-print("SDL init success.")
-SDL_Quit()
+exit(Application().run())