cmake FALCOR_HAS_VULKAN examples

NVIDIAGameWorks/Falcor CMakeLists.txt :208

message(STATUS "FALCOR_HAS_VULKAN: ${FALCOR_HAS_VULKAN}")

NVIDIAGameWorks/Falcor Source/Falcor/CMakeLists.txt :933

target_compile_definitions(Falcor
    PUBLIC
        $<$<CONFIG:Release>:NDEBUG>
        $<$<CONFIG:Debug>:_DEBUG>
        # Windows.
        $<$<PLATFORM_ID:Windows>:NOMINMAX>  # do not define min/max macros
        $<$<PLATFORM_ID:Windows>:UNICODE>   # force character map to unicode
        # MSVC C++ library.
        $<$<CXX_COMPILER_ID:MSVC>:_USE_MATH_DEFINES>
        $<$<CXX_COMPILER_ID:MSVC>:_SCL_SECURE_NO_WARNINGS>
        $<$<CXX_COMPILER_ID:MSVC>:_CRT_SECURE_NO_WARNINGS>
        $<$<CXX_COMPILER_ID:MSVC>:_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING>
        $<$<CXX_COMPILER_ID:MSVC>:_SILENCE_ALL_MS_EXT_DEPRECATION_WARNINGS>
        # Clang.
        $<$<CXX_COMPILER_ID:Clang>:_MSC_EXTENSIONS> # enable MS extensions
        # Falcor feature flags.
        FALCOR_ENABLE_ASSERTS=$<BOOL:${FALCOR_ENABLE_ASSERTS_}>
        FALCOR_ENABLE_PROFILER=$<BOOL:${FALCOR_ENABLE_PROFILER}>
        FALCOR_HAS_D3D12=$<BOOL:${FALCOR_HAS_D3D12}>
        FALCOR_HAS_VULKAN=$<BOOL:${FALCOR_HAS_VULKAN}>
        FALCOR_HAS_AFTERMATH=$<BOOL:${FALCOR_HAS_AFTERMATH}>
        FALCOR_HAS_NVAPI=$<BOOL:${FALCOR_HAS_NVAPI}>
        FALCOR_HAS_CUDA=$<BOOL:${FALCOR_HAS_CUDA}>
        FALCOR_HAS_D3D12_AGILITY_SDK=$<BOOL:${FALCOR_HAS_D3D12_AGILITY_SDK}>
        # TODO: RTXDI is always available, we might want to remove the feature flag.
        FALCOR_HAS_RTXDI=1
        IMGUI_USER_CONFIG="Utils/UI/ImGuiConfig.h"
    PRIVATE
        #$<$<CONFIG:Debug>:_ITERATOR_DEBUG_LEVEL=0>
        FALCOR_PROJECT_DIR="${CMAKE_SOURCE_DIR}/"
        FALCOR_DLL
        $<$<PLATFORM_ID:Windows>:IMGUI_API=__declspec\(dllexport\)>
        $<$<PLATFORM_ID:Linux>:IMGUI_API=__attribute__\(\(visibility\("default"\)\)\)>
)