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# SPDX-License-Identifier: BSD-3-Clause
# Copyright 2011 Blender Foundation.
# - Find OpenEXR library
# Find the native OpenEXR includes and library
# This module defines
# OPENEXR_INCLUDE_DIRS, where to find ImfXdr.h, etc. Set when
# OPENEXR_INCLUDE_DIR is found.
# OPENEXR_LIBRARIES, libraries to link against to use OpenEXR.
# OPENEXR_ROOT_DIR, The base directory to search for OpenEXR.
# This can also be an environment variable.
# OPENEXR_FOUND, If false, do not try to use OpenEXR.
#
# For individual library access these advanced settings are available
# OPENEXR_HALF_LIBRARY, Path to Half library
# OPENEXR_IEX_LIBRARY, Path to Half library
# OPENEXR_ILMIMF_LIBRARY, Path to Ilmimf library
# OPENEXR_ILMTHREAD_LIBRARY, Path to IlmThread library
# OPENEXR_IMATH_LIBRARY, Path to Imath library
#
# also defined, but not for general use are
# OPENEXR_LIBRARY, where to find the OpenEXR library.
# If OPENEXR_ROOT_DIR was defined in the environment, use it.
IF(NOT OPENEXR_ROOT_DIR AND NOT $ENV{OPENEXR_ROOT_DIR} STREQUAL "")
SET(OPENEXR_ROOT_DIR $ENV{OPENEXR_ROOT_DIR})
ENDIF()
# Old versions (before 2.0?) do not have any version string, just assuming this should be fine though.
SET(_openexr_libs_ver_init "2.0")
SET(_openexr_SEARCH_DIRS
${OPENEXR_ROOT_DIR}
/opt/lib/openexr
)
FIND_PATH(OPENEXR_INCLUDE_DIR
NAMES
OpenEXR/ImfXdr.h
HINTS
${_openexr_SEARCH_DIRS}
PATH_SUFFIXES
include
)
# If the headers were found, get the version from config file, if not already set.
IF(OPENEXR_INCLUDE_DIR)
IF(NOT OPENEXR_VERSION)
FIND_FILE(_openexr_CONFIG
NAMES
OpenEXRConfig.h
PATHS
"${OPENEXR_INCLUDE_DIR}"
"${OPENEXR_INCLUDE_DIR}/OpenEXR"
NO_DEFAULT_PATH
)
IF(_openexr_CONFIG)
FILE(STRINGS "${_openexr_CONFIG}" OPENEXR_BUILD_SPECIFICATION
REGEX "^[ \t]*#define[ \t]+OPENEXR_VERSION_STRING[ \t]+\"[.0-9]+\".*$")
ELSE()
MESSAGE(WARNING "Could not find \"OpenEXRConfig.h\" in \"${OPENEXR_INCLUDE_DIR}\"")
ENDIF()
IF(OPENEXR_BUILD_SPECIFICATION)
MESSAGE(STATUS "${OPENEXR_BUILD_SPECIFICATION}")
STRING(REGEX REPLACE ".*#define[ \t]+OPENEXR_VERSION_STRING[ \t]+\"([.0-9]+)\".*"
"\\1" _openexr_libs_ver_init ${OPENEXR_BUILD_SPECIFICATION})
ELSE()
MESSAGE(WARNING "Could not determine ILMBase library version, assuming ${_openexr_libs_ver_init}.")
ENDIF()
UNSET(_openexr_CONFIG CACHE)
ENDIF()
ENDIF()
SET("OPENEXR_VERSION" ${_openexr_libs_ver_init} CACHE STRING "Version of OpenEXR lib")
UNSET(_openexr_libs_ver_init)
STRING(REGEX REPLACE "([0-9]+)[.]([0-9]+).*" "\\1_\\2" _openexr_libs_ver ${OPENEXR_VERSION})
# Different library names in 3.0, and Imath and Half moved out.
IF(OPENEXR_VERSION VERSION_GREATER_EQUAL "3.0.0")
SET(_openexr_FIND_COMPONENTS
Iex
IlmThread
OpenEXR
OpenEXRCore
)
ELSE()
SET(_openexr_FIND_COMPONENTS
Half
Iex
IlmImf
IlmThread
Imath
)
ENDIF()
SET(_openexr_LIBRARIES)
FOREACH(COMPONENT ${_openexr_FIND_COMPONENTS})
STRING(TOUPPER ${COMPONENT} UPPERCOMPONENT)
FIND_LIBRARY(OPENEXR_${UPPERCOMPONENT}_LIBRARY
NAMES
${COMPONENT}-${_openexr_libs_ver} ${COMPONENT}
NAMES_PER_DIR
HINTS
${_openexr_SEARCH_DIRS}
PATH_SUFFIXES
lib64 lib
)
LIST(APPEND _openexr_LIBRARIES "${OPENEXR_${UPPERCOMPONENT}_LIBRARY}")
ENDFOREACH()
UNSET(_openexr_libs_ver)
IF(OPENEXR_VERSION VERSION_GREATER_EQUAL "3.0.0")
# For OpenEXR 3.x, we also need to find the now separate Imath library.
# For simplicity we add it to the OpenEXR includes and libraries, as we
# have no direct dependency on Imath and it's simpler to support both
# 2.x and 3.x this way.
# Find include directory
FIND_PATH(IMATH_INCLUDE_DIR
NAMES
Imath/ImathMath.h
HINTS
${_openexr_SEARCH_DIRS}
PATH_SUFFIXES
include
)
# Find version
FIND_FILE(_imath_config
NAMES
ImathConfig.h
PATHS
${IMATH_INCLUDE_DIR}/Imath
NO_DEFAULT_PATH
)
# Find line with version, extract string, and format for library suffix.
FILE(STRINGS "${_imath_config}" _imath_build_specification
REGEX "^[ \t]*#define[ \t]+IMATH_VERSION_STRING[ \t]+\"[.0-9]+\".*$")
STRING(REGEX REPLACE ".*#define[ \t]+IMATH_VERSION_STRING[ \t]+\"([.0-9]+)\".*"
"\\1" _imath_libs_ver ${_imath_build_specification})
STRING(REGEX REPLACE "([0-9]+)[.]([0-9]+).*" "\\1_\\2" _imath_libs_ver ${_imath_libs_ver})
# Find library, with or without version number.
FIND_LIBRARY(IMATH_LIBRARY
NAMES
Imath-${_imath_libs_ver} Imath
NAMES_PER_DIR
HINTS
${_openexr_SEARCH_DIRS}
PATH_SUFFIXES
lib64 lib
)
LIST(APPEND _openexr_LIBRARIES "${IMATH_LIBRARY}")
# In cmake version 3.21 and up, we can instead use the NO_CACHE option for
# FIND_FILE so we don't need to clear it from the cache here.
UNSET(_imath_config CACHE)
UNSET(_imath_libs_ver)
UNSET(_imath_build_specification)
ENDIF()
# handle the QUIETLY and REQUIRED arguments and set OPENEXR_FOUND to TRUE if
# all listed variables are TRUE
INCLUDE(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(OpenEXR DEFAULT_MSG
_openexr_LIBRARIES OPENEXR_INCLUDE_DIR)
IF(OPENEXR_FOUND)
SET(OPENEXR_LIBRARIES ${_openexr_LIBRARIES})
# Both include paths are needed because of dummy OSL headers mixing
# #include <OpenEXR/foo.h> and #include <foo.h>, as well as Alembic
# include <half.h> directly.
SET(OPENEXR_INCLUDE_DIRS
${OPENEXR_INCLUDE_DIR}
${OPENEXR_INCLUDE_DIR}/OpenEXR)
IF(OPENEXR_VERSION VERSION_GREATER_EQUAL "3.0.0")
LIST(APPEND OPENEXR_INCLUDE_DIRS
${IMATH_INCLUDE_DIR}
${IMATH_INCLUDE_DIR}/Imath)
ENDIF()
ENDIF()
MARK_AS_ADVANCED(
OPENEXR_INCLUDE_DIR
OPENEXR_VERSION
IMATH_INCLUDE_DIR
IMATH_LIBRARY
)
FOREACH(COMPONENT ${_openexr_FIND_COMPONENTS})
STRING(TOUPPER ${COMPONENT} UPPERCOMPONENT)
MARK_AS_ADVANCED(OPENEXR_${UPPERCOMPONENT}_LIBRARY)
ENDFOREACH()
UNSET(COMPONENT)
UNSET(UPPERCOMPONENT)
UNSET(_openexr_FIND_COMPONENTS)
UNSET(_openexr_LIBRARIES)
UNSET(_openexr_SEARCH_DIRS)
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