Detect and handle Vulkan SDK version changes in CMake

- Extract Vulkan SDK version from environment variable.
- Add cache-based version detection to identify changes.
- Clear related CMake cache entries on version update.
- Cache the current Vulkan SDK version for future checks.

Author: gpx1000

attachments/CMakeLists.txt

@@ -8,6 +8,28 @@ if(NOT DEFINED ENV{VULKAN_SDK})
     message(WARNING "VULKAN_SDK environment variable is not set. This may cause issues with finding Vulkan SDK.")
 endif()
 
+# Extract Vulkan SDK version from path to detect version changes
+if(DEFINED ENV{VULKAN_SDK})
+    string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+" VULKAN_SDK_VERSION "$ENV{VULKAN_SDK}")
+
+    # Check if cached version exists and is different from current version
+    if(DEFINED CACHE{VULKAN_SDK_CACHED_VERSION} AND NOT VULKAN_SDK_VERSION STREQUAL VULKAN_SDK_CACHED_VERSION)
+        message(STATUS "Vulkan SDK version changed from ${VULKAN_SDK_CACHED_VERSION} to ${VULKAN_SDK_VERSION}")
+        message(STATUS "Clearing CMake cache to ensure correct paths are used")
+
+        # Force CMake to reconfigure by removing cache entries related to Vulkan
+        unset(Vulkan_INCLUDE_DIR CACHE)
+        unset(Vulkan_LIBRARY CACHE)
+        unset(VulkanHpp_CPPM_DIR CACHE)
+        unset(GLSLANG_VALIDATOR CACHE)
+        unset(SLANGC_EXECUTABLE CACHE)
+    endif()
+
+    # Store current version in cache
+    set(VULKAN_SDK_CACHED_VERSION ${VULKAN_SDK_VERSION} CACHE STRING "Cached Vulkan SDK version" FORCE)
+    message(STATUS "Using Vulkan SDK version: ${VULKAN_SDK_VERSION}")
+endif()
+
 project (VulkanTutorial)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/CMake")