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CMake/Modules/FindOpenGL.cmake

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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
FindOpenGL
----------
FindModule for OpenGL and OpenGL Utility Library (GLU).
Optional COMPONENTS
^^^^^^^^^^^^^^^^^^^
This module respects several optional COMPONENTS: ``EGL``, ``GLX``, and
``OpenGL``. There are corresponding import targets for each of these flags.
IMPORTED Targets
^^^^^^^^^^^^^^^^
This module defines the :prop_tgt:`IMPORTED` targets:
``OpenGL::GL``
Defined to the platform-specific OpenGL libraries if the system has OpenGL.
``OpenGL::OpenGL``
Defined to libOpenGL if the system is GLVND-based.
``OpenGL::GLU``
Defined if the system has OpenGL Utility Library (GLU).
``OpenGL::GLX``
Defined if the system has OpenGL Extension to the X Window System (GLX).
``OpenGL::EGL``
Defined if the system has EGL.
Result Variables
^^^^^^^^^^^^^^^^
This module sets the following variables:
``OPENGL_FOUND``
True, if the system has OpenGL and all components are found.
``OPENGL_XMESA_FOUND``
True, if the system has XMESA.
``OPENGL_GLU_FOUND``
True, if the system has GLU.
``OpenGL_OpenGL_FOUND``
True, if the system has an OpenGL library.
``OpenGL_GLX_FOUND``
True, if the system has GLX.
``OpenGL_EGL_FOUND``
True, if the system has EGL.
``OPENGL_INCLUDE_DIR``
Path to the OpenGL include directory.
``OPENGL_EGL_INCLUDE_DIRS``
Path to the EGL include directory.
``OPENGL_LIBRARIES``
Paths to the OpenGL library, windowing system libraries, and GLU libraries.
On Linux, this assumes GLX and is never correct for EGL-based targets.
Clients are encouraged to use the ``OpenGL::*`` import targets instead.
Cache variables
^^^^^^^^^^^^^^^
The following cache variables may also be set:
``OPENGL_egl_LIBRARY``
Path to the EGL library.
``OPENGL_glu_LIBRARY``
Path to the GLU library.
``OPENGL_glx_LIBRARY``
Path to the GLVND 'GLX' library.
``OPENGL_opengl_LIBRARY``
Path to the GLVND 'OpenGL' library
``OPENGL_gl_LIBRARY``
Path to the OpenGL library. New code should prefer the ``OpenGL::*`` import
targets.
Linux-specific
^^^^^^^^^^^^^^
Some Linux systems utilize GLVND as a new ABI for OpenGL. GLVND separates
context libraries from OpenGL itself; OpenGL lives in "libOpenGL", and
contexts are defined in "libGLX" or "libEGL". GLVND is currently the only way
to get OpenGL 3+ functionality via EGL in a manner portable across vendors.
Projects may use GLVND explicitly with target ``OpenGL::OpenGL`` and either
``OpenGL::GLX`` or ``OpenGL::EGL``.
Projects may use the ``OpenGL::GL`` target (or ``OPENGL_LIBRARIES`` variable)
to use legacy GL interfaces. These will use the legacy GL library located
by ``OPENGL_gl_LIBRARY``, if available. If ``OPENGL_gl_LIBRARY`` is empty or
not found and GLVND is available, the ``OpenGL::GL`` target will use GLVND
``OpenGL::OpenGL`` and ``OpenGL::GLX`` (and the ``OPENGL_LIBRARIES``
variable will use the corresponding libraries). Thus, for non-EGL-based
Linux targets, the ``OpenGL::GL`` target is most portable.
A ``OpenGL_GL_PREFERENCE`` variable may be set to specify the preferred way
to provide legacy GL interfaces in case multiple choices are available.
The value may be one of:
``GLVND``
If the GLVND OpenGL and GLX libraries are available, prefer them.
This forces ``OPENGL_gl_LIBRARY`` to be empty.
This is the default if components were requested (since components
correspond to GLVND libraries) or if policy :policy:`CMP0072` is
set to ``NEW``.
``LEGACY``
Prefer to use the legacy libGL library, if available.
This is the default if no components were requested and
policy :policy:`CMP0072` is not set to ``NEW``.
For EGL targets the client must rely on GLVND support on the user's system.
Linking should use the ``OpenGL::OpenGL OpenGL::EGL`` targets. Using GLES*
libraries is theoretically possible in place of ``OpenGL::OpenGL``, but this
module does not currently support that; contributions welcome.
``OPENGL_egl_LIBRARY`` and ``OPENGL_EGL_INCLUDE_DIRS`` are defined in the case of
GLVND. For non-GLVND Linux and other systems these are left undefined.
macOS-Specific
^^^^^^^^^^^^^^
On OSX FindOpenGL defaults to using the framework version of OpenGL. People
will have to change the cache values of OPENGL_glu_LIBRARY and
OPENGL_gl_LIBRARY to use OpenGL with X11 on OSX.
#]=======================================================================]
set(_OpenGL_REQUIRED_VARS OPENGL_gl_LIBRARY)
# Provide OPENGL_USE_<C> variables for each component.
foreach(component ${OpenGL_FIND_COMPONENTS})
string(TOUPPER ${component} _COMPONENT)
set(OPENGL_USE_${_COMPONENT} 1)
endforeach()
set(_OpenGL_CACHE_VARS)
if (CYGWIN)
find_path(OPENGL_INCLUDE_DIR GL/gl.h )
list(APPEND _OpenGL_REQUIRED_VARS OPENGL_INCLUDE_DIR)
find_library(OPENGL_gl_LIBRARY opengl32 )
find_library(OPENGL_glu_LIBRARY glu32 )
list(APPEND _OpenGL_CACHE_VARS
OPENGL_INCLUDE_DIR
OPENGL_gl_LIBRARY
OPENGL_glu_LIBRARY
)
elseif (WIN32)
if(BORLAND)
set (OPENGL_gl_LIBRARY import32 CACHE STRING "OpenGL library for win32")
set (OPENGL_glu_LIBRARY import32 CACHE STRING "GLU library for win32")
else()
set (OPENGL_gl_LIBRARY opengl32 CACHE STRING "OpenGL library for win32")
set (OPENGL_glu_LIBRARY glu32 CACHE STRING "GLU library for win32")
endif()
list(APPEND _OpenGL_CACHE_VARS
OPENGL_gl_LIBRARY
OPENGL_glu_LIBRARY
)
elseif (APPLE)
# The OpenGL.framework provides both gl and glu
find_library(OPENGL_gl_LIBRARY OpenGL DOC "OpenGL library for OS X")
find_library(OPENGL_glu_LIBRARY OpenGL DOC
"GLU library for OS X (usually same as OpenGL library)")
find_path(OPENGL_INCLUDE_DIR OpenGL/gl.h DOC "Include for OpenGL on OS X")
list(APPEND _OpenGL_REQUIRED_VARS OPENGL_INCLUDE_DIR)
list(APPEND _OpenGL_CACHE_VARS
OPENGL_INCLUDE_DIR
OPENGL_gl_LIBRARY
OPENGL_glu_LIBRARY
)
else()
if (CMAKE_SYSTEM_NAME MATCHES "HP-UX")
# Handle HP-UX cases where we only want to find OpenGL in either hpux64
# or hpux32 depending on if we're doing a 64 bit build.
if(CMAKE_SIZEOF_VOID_P EQUAL 4)
set(_OPENGL_LIB_PATH
/opt/graphics/OpenGL/lib/hpux32/)
else()
set(_OPENGL_LIB_PATH
/opt/graphics/OpenGL/lib/hpux64/
/opt/graphics/OpenGL/lib/pa20_64)
endif()
elseif(CMAKE_SYSTEM_NAME STREQUAL Haiku)
set(_OPENGL_LIB_PATH
/boot/develop/lib/x86)
set(_OPENGL_INCLUDE_PATH
/boot/develop/headers/os/opengl)
endif()
# The first line below is to make sure that the proper headers
# are used on a Linux machine with the NVidia drivers installed.
# They replace Mesa with NVidia's own library but normally do not
# install headers and that causes the linking to
# fail since the compiler finds the Mesa headers but NVidia's library.
# Make sure the NVIDIA directory comes BEFORE the others.
# - Atanas Georgiev <atanas@cs.columbia.edu>
find_path(OPENGL_INCLUDE_DIR GL/gl.h
/usr/share/doc/NVIDIA_GLX-1.0/include
/usr/openwin/share/include
/opt/graphics/OpenGL/include
${_OPENGL_INCLUDE_PATH}
)
find_path(OPENGL_GLX_INCLUDE_DIR GL/glx.h ${_OPENGL_INCLUDE_PATH})
find_path(OPENGL_EGL_INCLUDE_DIR EGL/egl.h ${_OPENGL_INCLUDE_PATH})
find_path(OPENGL_xmesa_INCLUDE_DIR GL/xmesa.h
/usr/share/doc/NVIDIA_GLX-1.0/include
/usr/openwin/share/include
/opt/graphics/OpenGL/include
)
list(APPEND _OpenGL_CACHE_VARS
OPENGL_INCLUDE_DIR
OPENGL_GLX_INCLUDE_DIR
OPENGL_EGL_INCLUDE_DIR
OPENGL_xmesa_INCLUDE_DIR
)
# Search for the GLVND libraries. We do this regardless of COMPONENTS; we'll
# take into account the COMPONENTS logic later.
find_library(OPENGL_opengl_LIBRARY
NAMES OpenGL
PATHS ${_OPENGL_LIB_PATH}
)
find_library(OPENGL_glx_LIBRARY
NAMES GLX
PATHS ${_OPENGL_LIB_PATH}
PATH_SUFFIXES libglvnd
)
find_library(OPENGL_egl_LIBRARY
NAMES EGL
PATHS ${_OPENGL_LIB_PATH}
PATH_SUFFIXES libglvnd
)
find_library(OPENGL_glu_LIBRARY
NAMES GLU MesaGLU
PATHS ${OPENGL_gl_LIBRARY}
/opt/graphics/OpenGL/lib
/usr/openwin/lib
/usr/shlib
)
list(APPEND _OpenGL_CACHE_VARS
OPENGL_opengl_LIBRARY
OPENGL_glx_LIBRARY
OPENGL_egl_LIBRARY
OPENGL_glu_LIBRARY
)
set(_OpenGL_GL_POLICY_WARN 0)
if(NOT DEFINED OpenGL_GL_PREFERENCE)
set(OpenGL_GL_PREFERENCE "")
endif()
if(NOT OpenGL_GL_PREFERENCE STREQUAL "")
# A preference has been explicitly specified.
if(NOT OpenGL_GL_PREFERENCE MATCHES "^(GLVND|LEGACY)$")
message(FATAL_ERROR
"OpenGL_GL_PREFERENCE value '${OpenGL_GL_PREFERENCE}' not recognized. "
"Allowed values are 'GLVND' and 'LEGACY'."
)
endif()
elseif(OpenGL_FIND_COMPONENTS)
# No preference was explicitly specified, but the caller did request
# at least one GLVND component. Prefer GLVND for legacy GL.
set(OpenGL_GL_PREFERENCE "GLVND")
else()
# No preference was explicitly specified and no GLVND components were
# requested. Use a policy to choose the default.
cmake_policy(GET CMP0072 _OpenGL_GL_POLICY)
if("x${_OpenGL_GL_POLICY}x" STREQUAL "xNEWx")
set(OpenGL_GL_PREFERENCE "GLVND")
else()
set(OpenGL_GL_PREFERENCE "LEGACY")
if("x${_OpenGL_GL_POLICY}x" STREQUAL "xx")
set(_OpenGL_GL_POLICY_WARN 1)
endif()
endif()
unset(_OpenGL_GL_POLICY)
endif()
if("x${OpenGL_GL_PREFERENCE}x" STREQUAL "xGLVNDx" AND OPENGL_opengl_LIBRARY AND OPENGL_glx_LIBRARY)
# We can provide legacy GL using GLVND libraries.
# Do not use any legacy GL library.
set(OPENGL_gl_LIBRARY "")
else()
# We cannot provide legacy GL using GLVND libraries.
# Search for the legacy GL library.
find_library(OPENGL_gl_LIBRARY
NAMES GL MesaGL
PATHS /opt/graphics/OpenGL/lib
/usr/openwin/lib
/usr/shlib
${_OPENGL_LIB_PATH}
PATH_SUFFIXES libglvnd
)
list(APPEND _OpenGL_CACHE_VARS OPENGL_gl_LIBRARY)
endif()
if(_OpenGL_GL_POLICY_WARN AND OPENGL_gl_LIBRARY AND OPENGL_opengl_LIBRARY AND OPENGL_glx_LIBRARY)
cmake_policy(GET_WARNING CMP0072 _cmp0072_warning)
message(AUTHOR_WARNING
"${_cmp0072_warning}\n"
"FindOpenGL found both a legacy GL library:\n"
" OPENGL_gl_LIBRARY: ${OPENGL_gl_LIBRARY}\n"
"and GLVND libraries for OpenGL and GLX:\n"
" OPENGL_opengl_LIBRARY: ${OPENGL_opengl_LIBRARY}\n"
" OPENGL_glx_LIBRARY: ${OPENGL_glx_LIBRARY}\n"
"OpenGL_GL_PREFERENCE has not been set to \"GLVND\" or \"LEGACY\", so for "
"compatibility with CMake 3.10 and below the legacy GL library will be used."
)
endif()
unset(_OpenGL_GL_POLICY_WARN)
# FPHSA cannot handle "this OR that is required", so we conditionally set what
# it must look for. First clear any previous config we might have done:
set(_OpenGL_REQUIRED_VARS)
# now we append the libraries as appropriate. The complicated logic
# basically comes down to "use libOpenGL when we can, and add in specific
# context mechanisms when requested, or we need them to preserve the previous
# default where glx is always available."
if((NOT OPENGL_USE_EGL AND
NOT OPENGL_opengl_LIBRARY AND
OPENGL_glx_LIBRARY AND
NOT OPENGL_gl_LIBRARY) OR
(NOT OPENGL_USE_EGL AND
NOT OPENGL_glx_LIBRARY AND
NOT OPENGL_gl_LIBRARY) OR
(NOT OPENGL_USE_EGL AND
OPENGL_opengl_LIBRARY AND
OPENGL_glx_LIBRARY) OR
( OPENGL_USE_EGL))
list(APPEND _OpenGL_REQUIRED_VARS OPENGL_opengl_LIBRARY)
endif()
# GLVND GLX library. Preferred when available.
if((NOT OPENGL_USE_OPENGL AND
NOT OPENGL_USE_GLX AND
NOT OPENGL_USE_EGL AND
NOT OPENGL_glx_LIBRARY AND
NOT OPENGL_gl_LIBRARY) OR
( OPENGL_USE_GLX AND
NOT OPENGL_USE_EGL AND
NOT OPENGL_glx_LIBRARY AND
NOT OPENGL_gl_LIBRARY) OR
(NOT OPENGL_USE_EGL AND
OPENGL_opengl_LIBRARY AND
OPENGL_glx_LIBRARY) OR
(OPENGL_USE_GLX AND OPENGL_USE_EGL))
list(APPEND _OpenGL_REQUIRED_VARS OPENGL_glx_LIBRARY)
endif()
# GLVND EGL library.
if(OPENGL_USE_EGL)
list(APPEND _OpenGL_REQUIRED_VARS OPENGL_egl_LIBRARY)
endif()
# Old-style "libGL" library: used as a fallback when GLVND isn't available.
if((NOT OPENGL_USE_EGL AND
NOT OPENGL_opengl_LIBRARY AND
OPENGL_glx_LIBRARY AND
OPENGL_gl_LIBRARY) OR
(NOT OPENGL_USE_EGL AND
NOT OPENGL_glx_LIBRARY AND
OPENGL_gl_LIBRARY))
list(APPEND _OpenGL_REQUIRED_VARS OPENGL_gl_LIBRARY)
endif()
# We always need the 'gl.h' include dir.
list(APPEND _OpenGL_REQUIRED_VARS OPENGL_INCLUDE_DIR)
unset(_OPENGL_INCLUDE_PATH)
unset(_OPENGL_LIB_PATH)
find_library(OPENGL_glu_LIBRARY
NAMES GLU MesaGLU
PATHS ${OPENGL_gl_LIBRARY}
/opt/graphics/OpenGL/lib
/usr/openwin/lib
/usr/shlib
)
endif ()
if(OPENGL_xmesa_INCLUDE_DIR)
set( OPENGL_XMESA_FOUND "YES" )
else()
set( OPENGL_XMESA_FOUND "NO" )
endif()
if(OPENGL_glu_LIBRARY)
set( OPENGL_GLU_FOUND "YES" )
else()
set( OPENGL_GLU_FOUND "NO" )
endif()
# OpenGL_OpenGL_FOUND is a bit unique in that it is okay if /either/ libOpenGL
# or libGL is found.
# Using libGL with libEGL is never okay, though; we handle that case later.
if(NOT OPENGL_opengl_LIBRARY AND NOT OPENGL_gl_LIBRARY)
set(OpenGL_OpenGL_FOUND FALSE)
else()
set(OpenGL_OpenGL_FOUND TRUE)
endif()
if(OPENGL_glx_LIBRARY AND OPENGL_GLX_INCLUDE_DIR)
set(OpenGL_GLX_FOUND TRUE)
else()
set(OpenGL_GLX_FOUND FALSE)
endif()
if(OPENGL_egl_LIBRARY AND OPENGL_EGL_INCLUDE_DIR)
set(OpenGL_EGL_FOUND TRUE)
else()
set(OpenGL_EGL_FOUND FALSE)
endif()
# User-visible names should be plural.
if(OPENGL_EGL_INCLUDE_DIR)
set(OPENGL_EGL_INCLUDE_DIRS ${OPENGL_EGL_INCLUDE_DIR})
endif()
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(OpenGL REQUIRED_VARS ${_OpenGL_REQUIRED_VARS}
HANDLE_COMPONENTS)
unset(_OpenGL_REQUIRED_VARS)
# OpenGL:: targets
if(OPENGL_FOUND)
# ::OpenGL is a GLVND library, and thus Linux-only: we don't bother checking
# for a framework version of this library.
if(OPENGL_opengl_LIBRARY AND NOT TARGET OpenGL::OpenGL)
if(IS_ABSOLUTE "${OPENGL_opengl_LIBRARY}")
add_library(OpenGL::OpenGL UNKNOWN IMPORTED)
set_target_properties(OpenGL::OpenGL PROPERTIES IMPORTED_LOCATION
"${OPENGL_opengl_LIBRARY}")
else()
add_library(OpenGL::OpenGL INTERFACE IMPORTED)
set_target_properties(OpenGL::OpenGL PROPERTIES IMPORTED_LIBNAME
"${OPENGL_opengl_LIBRARY}")
endif()
set_target_properties(OpenGL::OpenGL PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
"${OPENGL_INCLUDE_DIR}")
endif()
# ::GLX is a GLVND library, and thus Linux-only: we don't bother checking
# for a framework version of this library.
if(OpenGL_GLX_FOUND AND NOT TARGET OpenGL::GLX)
if(IS_ABSOLUTE "${OPENGL_glx_LIBRARY}")
add_library(OpenGL::GLX UNKNOWN IMPORTED)
set_target_properties(OpenGL::GLX PROPERTIES IMPORTED_LOCATION
"${OPENGL_glx_LIBRARY}")
else()
add_library(OpenGL::GLX INTERFACE IMPORTED)
set_target_properties(OpenGL::GLX PROPERTIES IMPORTED_LIBNAME
"${OPENGL_glx_LIBRARY}")
endif()
set_target_properties(OpenGL::GLX PROPERTIES INTERFACE_LINK_LIBRARIES
OpenGL::OpenGL)
set_target_properties(OpenGL::GLX PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
"${OPENGL_GLX_INCLUDE_DIR}")
endif()
if(OPENGL_gl_LIBRARY AND NOT TARGET OpenGL::GL)
# A legacy GL library is available, so use it for the legacy GL target.
if(IS_ABSOLUTE "${OPENGL_gl_LIBRARY}")
add_library(OpenGL::GL UNKNOWN IMPORTED)
if(OPENGL_gl_LIBRARY MATCHES "/([^/]+)\\.framework$")
set(_gl_fw "${OPENGL_gl_LIBRARY}/${CMAKE_MATCH_1}")
if(EXISTS "${_gl_fw}.tbd")
string(APPEND _gl_fw ".tbd")
endif()
set_target_properties(OpenGL::GL PROPERTIES
IMPORTED_LOCATION "${_gl_fw}")
else()
set_target_properties(OpenGL::GL PROPERTIES
IMPORTED_LOCATION "${OPENGL_gl_LIBRARY}")
endif()
else()
add_library(OpenGL::GL INTERFACE IMPORTED)
set_target_properties(OpenGL::GL PROPERTIES
IMPORTED_LIBNAME "${OPENGL_gl_LIBRARY}")
endif()
set_target_properties(OpenGL::GL PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${OPENGL_INCLUDE_DIR}")
elseif(NOT TARGET OpenGL::GL AND TARGET OpenGL::OpenGL AND TARGET OpenGL::GLX)
# A legacy GL library is not available, but we can provide the legacy GL
# target using GLVND OpenGL+GLX.
add_library(OpenGL::GL INTERFACE IMPORTED)
set_target_properties(OpenGL::GL PROPERTIES INTERFACE_LINK_LIBRARIES
OpenGL::OpenGL)
set_property(TARGET OpenGL::GL APPEND PROPERTY INTERFACE_LINK_LIBRARIES
OpenGL::GLX)
set_target_properties(OpenGL::GL PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
"${OPENGL_INCLUDE_DIR}")
endif()
# ::EGL is a GLVND library, and thus Linux-only: we don't bother checking
# for a framework version of this library.
# Note we test for OpenGL::OpenGL as a target. When this module is updated to
# support GLES, we would additionally want to check for the hypothetical GLES
# target and enable EGL if either ::GLES or ::OpenGL is created.
if(TARGET OpenGL::OpenGL AND OpenGL_EGL_FOUND AND NOT TARGET OpenGL::EGL)
if(IS_ABSOLUTE "${OPENGL_egl_LIBRARY}")
add_library(OpenGL::EGL UNKNOWN IMPORTED)
set_target_properties(OpenGL::EGL PROPERTIES IMPORTED_LOCATION
"${OPENGL_egl_LIBRARY}")
else()
add_library(OpenGL::EGL INTERFACE IMPORTED)
set_target_properties(OpenGL::EGL PROPERTIES IMPORTED_LIBNAME
"${OPENGL_egl_LIBRARY}")
endif()
set_target_properties(OpenGL::EGL PROPERTIES INTERFACE_LINK_LIBRARIES
OpenGL::OpenGL)
# Note that EGL's include directory is different from OpenGL/GLX's!
set_target_properties(OpenGL::EGL PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
"${OPENGL_EGL_INCLUDE_DIR}")
endif()
if(OPENGL_GLU_FOUND AND NOT TARGET OpenGL::GLU)
if(IS_ABSOLUTE "${OPENGL_glu_LIBRARY}")
add_library(OpenGL::GLU UNKNOWN IMPORTED)
if(OPENGL_glu_LIBRARY MATCHES "/([^/]+)\\.framework$")
set(_glu_fw "${OPENGL_glu_LIBRARY}/${CMAKE_MATCH_1}")
if(EXISTS "${_glu_fw}.tbd")
string(APPEND _glu_fw ".tbd")
endif()
set_target_properties(OpenGL::GLU PROPERTIES
IMPORTED_LOCATION "${_glu_fw}")
else()
set_target_properties(OpenGL::GLU PROPERTIES
IMPORTED_LOCATION "${OPENGL_glu_LIBRARY}")
endif()
else()
add_library(OpenGL::GLU INTERFACE IMPORTED)
set_target_properties(OpenGL::GLU PROPERTIES
IMPORTED_LIBNAME "${OPENGL_glu_LIBRARY}")
endif()
set_target_properties(OpenGL::GLU PROPERTIES
INTERFACE_LINK_LIBRARIES OpenGL::GL)
endif()
# OPENGL_LIBRARIES mirrors OpenGL::GL's logic ...
if(OPENGL_gl_LIBRARY)
set(OPENGL_LIBRARIES ${OPENGL_gl_LIBRARY})
elseif(TARGET OpenGL::OpenGL AND TARGET OpenGL::GLX)
set(OPENGL_LIBRARIES ${OPENGL_opengl_LIBRARY} ${OPENGL_glx_LIBRARY})
else()
set(OPENGL_LIBRARIES "")
endif()
# ... and also includes GLU, if available.
if(TARGET OpenGL::GLU)
list(APPEND OPENGL_LIBRARIES ${OPENGL_glu_LIBRARY})
endif()
endif()
# This deprecated setting is for backward compatibility with CMake1.4
set(OPENGL_LIBRARY ${OPENGL_LIBRARIES})
# This deprecated setting is for backward compatibility with CMake1.4
set(OPENGL_INCLUDE_PATH ${OPENGL_INCLUDE_DIR})
mark_as_advanced(${_OpenGL_CACHE_VARS})
unset(_OpenGL_CACHE_VARS)
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