fix: complete cross-platform examples build support

- Add include paths for all examples (src/, generated/, protobuf)
- Copy DLLs to examples output on Windows
- Use FetchContent for SDL3 on all platforms
- Remove sdl3 from vcpkg.json (not in baseline)

Author: Sqhh99

examples/CMakeLists.txt

@@ -4,11 +4,17 @@ project(livekit-examples)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-find_package(SDL3 CONFIG QUIET)
-if(NOT SDL3_FOUND)
-  list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
-  include(sdl3)
-endif()
+# Always use FetchContent for SDL3 (vcpkg doesn't have it in stable baseline)
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+include(sdl3)
+
+# Common include directories for examples that need private headers
+# TODO: These should be refactored to use only public headers
+set(EXAMPLES_PRIVATE_INCLUDE_DIRS
+    ${LIVEKIT_ROOT_DIR}/src
+    ${LIVEKIT_BINARY_DIR}/generated
+    ${Protobuf_INCLUDE_DIRS}
+)
 
 add_executable(SimpleRoom
     simple_room/main.cpp
@@ -24,6 +30,8 @@ add_executable(SimpleRoom
     simple_room/wav_audio_source.h
 )
 
+target_include_directories(SimpleRoom PRIVATE ${EXAMPLES_PRIVATE_INCLUDE_DIRS})
+
 target_link_libraries(SimpleRoom
     PRIVATE
         livekit
@@ -50,6 +58,8 @@ add_executable(SimpleRpc
   simple_rpc/main.cpp
 )
 
+target_include_directories(SimpleRpc PRIVATE ${EXAMPLES_PRIVATE_INCLUDE_DIRS})
+
 target_link_libraries(SimpleRpc
   PRIVATE
     nlohmann_json::nlohmann_json
@@ -60,6 +70,8 @@ add_executable(SimpleDataStream
   simple_data_stream/main.cpp
 )
 
+target_include_directories(SimpleDataStream PRIVATE ${EXAMPLES_PRIVATE_INCLUDE_DIRS})
+
 target_link_libraries(SimpleDataStream
   PRIVATE
     livekit
@@ -71,4 +83,30 @@ add_custom_command(
   COMMAND ${CMAKE_COMMAND} -E copy_directory
           ${LIVEKIT_ROOT_DIR}/data
           $<TARGET_FILE_DIR:SimpleDataStream>/data
-)
+)
+
+# Windows: Copy required DLLs to examples output directory
+if(WIN32)
+  # Get the livekit library output directory (where DLLs are copied during main build)
+  set(LIVEKIT_LIB_DIR $<TARGET_FILE_DIR:livekit>)
+  
+  # List of DLLs to copy
+  set(REQUIRED_DLLS
+    "livekit_ffi.dll"
+    "libprotobuf.dll"
+    "abseil_dll.dll"
+  )
+  
+  # Copy DLLs to each example's output directory
+  foreach(EXAMPLE SimpleRoom SimpleRpc SimpleDataStream)
+    foreach(DLL ${REQUIRED_DLLS})
+      add_custom_command(TARGET ${EXAMPLE} POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E copy_if_different
+                "${LIVEKIT_LIB_DIR}/${DLL}"
+                "$<TARGET_FILE_DIR:${EXAMPLE}>/${DLL}"
+        COMMENT "Copying ${DLL} to ${EXAMPLE} output directory"
+        VERBATIM
+      )
+    endforeach()
+  endforeach()
+endif()

vcpkg.json

@@ -17,7 +17,6 @@
     "examples": {
       "description": "Build example applications",
       "dependencies": [
-        "sdl3",
         "nlohmann-json"
       ]
     }