Added alternative way to get vulkan headers as submodule

Signed-off-by: Tobias Frisch <tfrisch@uni-koblenz.de>

.gitmodules

@@ -28,3 +28,9 @@
 [submodule "modules/upscaling/lib/FidelityFX-FSR"]
 	path = modules/upscaling/lib/FidelityFX-FSR
 	url = https://github.com/GPUOpen-Effects/FidelityFX-FSR.git
+[submodule "lib/Vulkan-Headers"]
+	path = lib/Vulkan-Headers
+	url = https://github.com/KhronosGroup/Vulkan-Headers.git
+[submodule "lib/Vulkan-Hpp"]
+	path = lib/Vulkan-Hpp
+	url = https://github.com/KhronosGroup/Vulkan-Hpp

CMakeLists.txt

@@ -98,6 +98,7 @@ endif()
 include(${vkcv_config}/Sources.cmake)
 
 message(STATUS "Framework:")
+message(" - Includes: [ ${vkcv_includes} ]")
 message(" - Libraries: [ ${vkcv_libraries} ]")
 message(" - Flags: [ ${vkcv_flags} ]")
 

config/lib/Vulkan.cmake

@@ -2,7 +2,26 @@
 find_package(Vulkan REQUIRED)
 
 if (Vulkan_FOUND)
-    list(APPEND vkcv_includes ${Vulkan_INCLUDE_DIR})
+    if (NOT EXISTS ${Vulkan_INCLUDE_DIR}/vulkan/vulkan.h)
+        use_git_submodule("${vkcv_lib_path}/Vulkan-Headers" vulkan_headers_status)
+        
+        if (${vulkan_headers_status})
+            list(APPEND vkcv_includes ${vkcv_lib}/Vulkan-Headers/include)
+        endif()
+    else()
+        list(APPEND vkcv_includes ${Vulkan_INCLUDE_DIR})
+    endif()
+
+    if (NOT EXISTS ${Vulkan_INCLUDE_DIR}/vulkan/vulkan.hpp)
+        use_git_submodule("${vkcv_lib_path}/Vulkan-Hpp" vulkan_hpp_status)
+    
+        if (${vulkan_hpp_status})
+            list(APPEND vkcv_includes ${vkcv_lib}/Vulkan-Hpp)
+        endif()
+    else()
+        list(APPEND vkcv_includes ${Vulkan_INCLUDE_DIR})
+    endif()
+    
     list(APPEND vkcv_libraries ${Vulkan_LIBRARIES})
 
     message(${vkcv_config_msg} " Vulkan  -   ")

Vulkan-Headers @ 8ba8294c

+Subproject commit 8ba8294c86d0e99fcb457bedbd573dd678ccc9b3

Vulkan-Hpp @ ae1b0c36

+Subproject commit ae1b0c36df0943795cd621a37e7f7bfd00ac958a