inital, almost working cross-compilation setup with Visual Studio and cmake

CMakeLists.txt

@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.18)
+project(GameEngine VERSION 0.1.0 LANGUAGES C CXX)
+
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# --- Validate preset variables ---
+if(NOT DEFINED SDL_LINK_TYPE OR NOT SDL_LINK_TYPE MATCHES "^(static|dynamic)$")
+    message(FATAL_ERROR "SDL_LINK_TYPE must be 'static' or 'dynamic'. Use a CMake preset.")
+endif()
+
+if(NOT DEFINED PLATFORM OR NOT PLATFORM MATCHES "^(windows|linux)$")
+    message(FATAL_ERROR "PLATFORM must be 'windows' or 'linux'. Use a CMake preset.")
+endif()
+
+message(STATUS "Build config: PLATFORM=${PLATFORM}, SDL_LINK_TYPE=${SDL_LINK_TYPE}, BUILD_TYPE=${CMAKE_BUILD_TYPE}")
+
+# --- Resolve SDL ---
+include(cmake/SDLSetup.cmake)
+
+# --- Subdirectories ---
+add_subdirectory(engine)
+add_subdirectory(game)