# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
FindVulkan
----------

Find Vulkan, which isis a low-overhead, cross-platform 3D graphics
and computing API.

IMPORTED Targets
^^^^^^^^^^^^^^^^

This module defines :prop_tgt:`IMPORTED` target ``Vulkan::Vulkan``, if
Vulkan has been found.

Result Variables
^^^^^^^^^^^^^^^^

This module defines the following variables::

  Vulkan_FOUND          - "True" if Vulkan was found
  Vulkan_INCLUDE_DIRS   - include directories for Vulkan
  Vulkan_LIBRARIES      - link against this library to use Vulkan

The module will also define two cache variables::

  Vulkan_INCLUDE_DIR    - the Vulkan include directory
  Vulkan_LIBRARY        - the path to the Vulkan library

#]=======================================================================]

if(WIN32)
  find_path(Vulkan_INCLUDE_DIR
    NAMES vulkan/vulkan.h
    PATHS
      "$ENV{VULKAN_SDK}/Include"
    )

  if(CMAKE_SIZEOF_VOID_P EQUAL 8)
    find_library(Vulkan_LIBRARY
      NAMES vulkan-1
      PATHS
        "$ENV{VULKAN_SDK}/Lib"
        "$ENV{VULKAN_SDK}/Bin"
        )
  elseif(CMAKE_SIZEOF_VOID_P EQUAL 4)
    find_library(Vulkan_LIBRARY
      NAMES vulkan-1
      PATHS
        "$ENV{VULKAN_SDK}/Lib32"
        "$ENV{VULKAN_SDK}/Bin32"
        NO_SYSTEM_ENVIRONMENT_PATH
        )
  endif()
else()
    find_path(Vulkan_INCLUDE_DIR
      NAMES vulkan/vulkan.h
      PATHS
        "$ENV{VULKAN_SDK}/include")
    find_library(Vulkan_LIBRARY
      NAMES vulkan
      PATHS
        "$ENV{VULKAN_SDK}/lib")
endif()

set(Vulkan_LIBRARIES ${Vulkan_LIBRARY})
set(Vulkan_INCLUDE_DIRS ${Vulkan_INCLUDE_DIR})

include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
find_package_handle_standard_args(Vulkan
  DEFAULT_MSG
  Vulkan_LIBRARY Vulkan_INCLUDE_DIR)

mark_as_advanced(Vulkan_INCLUDE_DIR Vulkan_LIBRARY)

if(Vulkan_FOUND AND NOT TARGET Vulkan::Vulkan)
  add_library(Vulkan::Vulkan UNKNOWN IMPORTED)
  set_target_properties(Vulkan::Vulkan PROPERTIES
    IMPORTED_LOCATION "${Vulkan_LIBRARIES}"
    INTERFACE_INCLUDE_DIRECTORIES "${Vulkan_INCLUDE_DIRS}")
endif()