#.rst:
# FindVulkan
# ----------
#
# Try to find Vulkan
#
# 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
#

#=============================================================================
# Copyright 2016 Matthaeus G. Chajdas
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
#  License text for the above reference.)

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
        "$ENV{VULKAN_SDK}/Bin")
  elseif(CMAKE_SIZEOF_VOID_P EQUAL 4)
    find_library(Vulkan_LIBRARY
      NAMES vulkan-1
      PATHS
        "$ENV{VULKAN_SDK}/Bin32")
  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(FindPackageHandleStandardArgs)
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()
