# - Try to find OpenCL
# This module tries to find an OpenCL implementation on your system. It supports
# AMD / ATI, Apple and NVIDIA implementations, but shoudl work, too.
#
# Once done this will define
#  OPENCL_FOUND        - system has OpenCL
#  OPENCL_INCLUDE_DIRS  - the OpenCL include directory
#  OPENCL_LIBRARIES    - link these to use OpenCL
#
# WIN32 should work, but is untested

FIND_PACKAGE( PackageHandleStandardArgs )

SET (OPENCL_VERSION_STRING "0.1.0")
SET (OPENCL_VERSION_MAJOR 0)
SET (OPENCL_VERSION_MINOR 1)
SET (OPENCL_VERSION_PATCH 0)

IF (APPLE)

  FIND_LIBRARY(OPENCL_LIBRARIES OpenCL DOC "OpenCL lib for OSX")
  FIND_PATH(OPENCL_INCLUDE_DIRS OpenCL/cl.h DOC "Include for OpenCL on OSX")
  FIND_PATH(_OPENCL_CPP_INCLUDE_DIRS OpenCL/cl.hpp DOC "Include for OpenCL CPP bindings on OSX")

ELSE (APPLE)

    IF (WIN32)
    
        FIND_PATH(OPENCL_INCLUDE_DIRS CL/cl.h)
        FIND_PATH(_OPENCL_CPP_INCLUDE_DIRS CL/cl.hpp)
    
        # The AMD SDK currently installs both x86 and x86_64 libraries
        # This is only a hack to find out architecture
        IF( ${CMAKE_SYSTEM_PROCESSOR} STREQUAL "AMD64" )
            SET(OPENCL_LIB_DIR "$ENV{ATISTREAMSDKROOT}/lib/x86_64")
        ELSE (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "AMD64")
            SET(OPENCL_LIB_DIR "$ENV{ATISTREAMSDKROOT}/lib/x86")
        ENDIF( ${CMAKE_SYSTEM_PROCESSOR} STREQUAL "AMD64" )
        FIND_LIBRARY(OPENCL_LIBRARIES OpenCL.lib ${OPENCL_LIB_DIR})
        
        GET_FILENAME_COMPONENT(_OPENCL_INC_CAND ${OPENCL_LIB_DIR}/../../include ABSOLUTE)
        
        # On Win32 search relative to the library
        FIND_PATH(OPENCL_INCLUDE_DIRS CL/cl.h PATHS "${_OPENCL_INC_CAND}")
        FIND_PATH(_OPENCL_CPP_INCLUDE_DIRS CL/cl.hpp PATHS "${_OPENCL_INC_CAND}")
    
    ELSE (WIN32)

            # Unix style platforms
            FIND_LIBRARY(OPENCL_LIBRARIES OpenCL
              ENV LD_LIBRARY_PATH
            )

            GET_FILENAME_COMPONENT(OPENCL_LIB_DIR ${OPENCL_LIBRARIES} PATH)
            GET_FILENAME_COMPONENT(_OPENCL_INC_CAND ${OPENCL_LIB_DIR}/../../include ABSOLUTE)

            # The AMD SDK currently does not place its headers
            # in /usr/include, therefore also search relative
            # to the library
            FIND_PATH(OPENCL_INCLUDE_DIRS CL/cl.h PATHS ${_OPENCL_INC_CAND} "/usr/local/cuda/include")
            FIND_PATH(_OPENCL_CPP_INCLUDE_DIRS CL/cl.hpp PATHS ${_OPENCL_INC_CAND} "/usr/local/cuda/include")

    ENDIF (WIN32)

ENDIF (APPLE)

FIND_PACKAGE_HANDLE_STANDARD_ARGS( OpenCL DEFAULT_MSG OPENCL_LIBRARIES OPENCL_INCLUDE_DIRS )

IF( _OPENCL_CPP_INCLUDE_DIRS )
    SET( OPENCL_HAS_CPP_BINDINGS TRUE )
    LIST( APPEND OPENCL_INCLUDE_DIRS ${_OPENCL_CPP_INCLUDE_DIRS} )
    # This is often the same, so clean up
    LIST( REMOVE_DUPLICATES OPENCL_INCLUDE_DIRS )
ENDIF( _OPENCL_CPP_INCLUDE_DIRS )

MARK_AS_ADVANCED(
  OPENCL_INCLUDE_DIRS
)


