# The name of our project is "VULKAN". CMakeLists files in this project can
# refer to the root source directory of the project as ${VULKAN_SOURCE_DIR} and
# to the root binary directory of the project as ${VULKAN_BINARY_DIR}.
cmake_minimum_required(VERSION 2.8.11)

# This must come before the project command.
set(CMAKE_OSX_DEPLOYMENT_TARGET "10.12" CACHE STRING "Minimum OS X deployment version")

project (Vulkan-ValidationLayers)
# set (CMAKE_VERBOSE_MAKEFILE 1)

# The API_NAME allows renaming builds to avoid conflicts with installed SDKs
# The MAJOR number of the version we're building, used in naming
# <api-name>-<major>.dll (and other files).
set(API_NAME "Vulkan" CACHE STRING "API name to use when building")
set(MAJOR "1")
string(TOLOWER ${API_NAME} API_LOWERCASE)

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

# if CMAKE 3.7+, use FindVulkan
if (NOT CMAKE_VERSION VERSION_LESS 3.7.0)
    message(STATUS "Using find_package to locate Vulkan")
    find_package(Vulkan)
endif()
find_package(PythonInterp 3 REQUIRED)

option(USE_CCACHE "Use ccache" OFF)
if (USE_CCACHE)
    find_program(CCACHE_FOUND ccache)
    if(CCACHE_FOUND)
        set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
        set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
    endif(CCACHE_FOUND)
endif()

if(APPLE)
    # CMake versions 3 or later need CMAKE_MACOSX_RPATH defined.
    # This avoids the CMP0042 policy message.
    set(CMAKE_MACOSX_RPATH 1)
    # The "install" target for MacOS fixes up bundles in place.
    set(CMAKE_INSTALL_PREFIX ${CMAKE_BINARY_DIR})
endif()

# Enable cmake folders
set_property(GLOBAL PROPERTY USE_FOLDERS ON)
set(LVL_TARGET_FOLDER lvl_cmake_targets)

if(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Darwin")
    set(FALLBACK_CONFIG_DIRS "/etc/xdg" CACHE STRING
        "Search path to use when XDG_CONFIG_DIRS is unset or empty or the current process is SUID/SGID. Default is freedesktop compliant.")
    set(FALLBACK_DATA_DIRS "/usr/local/share:/usr/share" CACHE STRING
        "Search path to use when XDG_DATA_DIRS is unset or empty or the current process is SUID/SGID. Default is freedesktop compliant.")
endif()

if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
    include(FindPkgConfig)
    option(BUILD_WSI_XCB_SUPPORT "Build XCB WSI support" ON)
    option(BUILD_WSI_XLIB_SUPPORT "Build Xlib WSI support" ON)
    option(BUILD_WSI_WAYLAND_SUPPORT "Build Wayland WSI support" ON)
    option(BUILD_WSI_MIR_SUPPORT "Build Mir WSI support" OFF)
    set(DEMOS_WSI_SELECTION "XCB" CACHE STRING "Select WSI target for demos (XCB, XLIB, WAYLAND, MIR, DISPLAY)")

    if (BUILD_WSI_XCB_SUPPORT)
        find_package(XCB REQUIRED)
    endif()

    if (BUILD_WSI_XLIB_SUPPORT)
        find_package(X11 REQUIRED)
    endif()

    if (BUILD_WSI_WAYLAND_SUPPORT)
        find_package(Wayland REQUIRED)
        include_directories(${WAYLAND_CLIENT_INCLUDE_DIR})
    endif()

    if (BUILD_WSI_MIR_SUPPORT)
        find_package(Mir REQUIRED)
    endif()

    # This option can be used to suppress the installation of artifacts from the
    # Vulkan-LoaderAndValidationLayers repo while running "make install" for the
    # VulkanTools and VulkanSamples repos.  This can be used to prevent the
    # overwriting of LVL artifacts when installing these downstream repos.
    option(INSTALL_LVL_FILES "Install content from LoaderAndValidationLayers repo" ON)
endif()

# TODO: Add option to override this with env var, or even to use SDK
set(VULKAN_HEADERS_LOCATION "${CMAKE_CURRENT_SOURCE_DIR}/Vulkan-Headers")

if (CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID MATCHES "Clang")
    set(COMMON_COMPILE_FLAGS "-Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers")
    set(COMMON_COMPILE_FLAGS "${COMMON_COMPILE_FLAGS} -fno-strict-aliasing -fno-builtin-memcmp")

    # For GCC version 7.1 or greater, we need to disable the implicit fallthrough warning since
    # there's no consistent way to satisfy all compilers until they all accept the C++17 standard
    if (CMAKE_COMPILER_IS_GNUCC AND NOT (CMAKE_CXX_COMPILER_VERSION LESS 7.1))
        set(COMMON_COMPILE_FLAGS "${COMMON_COMPILE_FLAGS} -Wimplicit-fallthrough=0")
    endif()

    if (APPLE)
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${COMMON_COMPILE_FLAGS}")
    else()
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 ${COMMON_COMPILE_FLAGS}")
    endif()
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COMMON_COMPILE_FLAGS} -std=c++11 -fno-rtti")
    if (UNIX)
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden")
    endif()
endif()

if(WIN32)
    # Treat warnings as errors
    add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/WX>")
    # Disable RTTI
    add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/GR->")
    # Warn about nested declarations
    add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/w34456>")
    # Warn about potentially uninitialized variables
    add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/w34701>")
    add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/w34703>")
    # Warn about different indirection types.
    add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/w34057>")
    # Warn about signed/unsigned mismatch.
    add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/w34245>")
endif()

if(NOT WIN32)
    set (BUILDTGT_DIR build)
    set (BINDATA_DIR Bin)
    set (LIBSOURCE_DIR Lib)
else()
    # is WIN32
    option(ENABLE_WIN10_ONECORE "Link the loader with OneCore umbrella libraries" OFF)

    # For Windows, since 32-bit and 64-bit items can co-exist, we build each in its own build directory.
    # 32-bit target data goes in build32, and 64-bit target data goes into build.  So, include/link the
    # appropriate data at build time.
    if (DISABLE_BUILDTGT_DIR_DECORATION)
        set (BUILDTGT_DIR "")
        set (BINDATA_DIR "")
        set (LIBSOURCE_DIR "")
    elseif (CMAKE_CL_64)
        set (BUILDTGT_DIR build)
        set (BINDATA_DIR Bin)
        set (LIBSOURCE_DIR Lib)
    else()
        set (BUILDTGT_DIR build32)
        set (BINDATA_DIR Bin32)
        set (LIBSOURCE_DIR Lib32)
    endif()
endif()

option(BUILD_TESTS "Build tests" ON)
option(BUILD_LAYERS "Build layers" ON)

set(VULKAN_SDK $ENV{VULKAN_SDK})

find_program(GLSLANG_VALIDATOR NAMES glslangValidator
             HINTS "${EXTERNAL_SOURCE_ROOT}/glslang/${BUILDTGT_DIR}/install/bin"
                   "${VULKAN_SDK}/${BINDATA_DIR}"
                   "${GLSLANG_BINARY_ROOT}/StandAlone"
                   "${PROJECT_SOURCE_DIR}/external/${BINDATA_DIR}")

find_path(GLSLANG_SPIRV_INCLUDE_DIR SPIRV/spirv.hpp
             HINTS "${EXTERNAL_SOURCE_ROOT}/glslang"
                   "${CMAKE_SOURCE_DIR}/../glslang"
                   "${VULKAN_SDK}/include/vulkan"
                   DOC "Path to SPIRV/spirv.hpp")

message("XXXXXXXXXXXXXX vksdkpath = ${VULKAN_SDK}")

find_path(SPIRV_TOOLS_INCLUDE_DIR spirv-tools/libspirv.h
             HINTS "${EXTERNAL_SOURCE_ROOT}/glslang/External/spirv-tools/include"
                   "${CMAKE_SOURCE_DIR}/../glslang/External/spirv-tools/include"
                   "${VULKAN_SDK}/spirv-tools/include"
                   DOC "Path to spirv-tools/libspirv.h")

set (PYTHON_CMD ${PYTHON_EXECUTABLE})

if(NOT WIN32)
    include(GNUInstallDirs)

    add_definitions(-DFALLBACK_CONFIG_DIRS="${FALLBACK_CONFIG_DIRS}")
    add_definitions(-DFALLBACK_DATA_DIRS="${FALLBACK_DATA_DIRS}")
    add_definitions(-DSYSCONFDIR="${CMAKE_INSTALL_FULL_SYSCONFDIR}")

    # Make sure /etc is searched by the loader
    if(NOT (CMAKE_INSTALL_FULL_SYSCONFDIR STREQUAL "/etc"))
        add_definitions(-DEXTRASYSCONFDIR="/etc")
    endif()
endif()

if(UNIX)
    if(INSTALL_LVL_FILES)
        install(DIRECTORY "${PROJECT_SOURCE_DIR}/include/vulkan" DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
        install(FILES "${CMAKE_CURRENT_BINARY_DIR}/vk_layer_dispatch_table.h" DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/vulkan")
    endif()

# uninstall target
configure_file(
    "${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake_uninstall.cmake.in"
    "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake"
    IMMEDIATE @ONLY)

add_custom_target(uninstall
    COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake)
endif()

add_definitions(-DAPI_NAME="${API_NAME}")

if(BUILD_TESTS)
    add_subdirectory(tests)
endif()

if(BUILD_LAYERS)
    add_subdirectory(layers)
endif()