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Commit fef41372 authored by James Kress's avatar James Kress
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Merge remote-tracking branch 'upstream/master'

parents 3be8b9c5 adfff37e
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CMake/FindEGL.cmake deleted 100644 → 0
View file @ 3be8b9c5
##============================================================================
## Copyright (c) Kitware, Inc.
## All rights reserved.
## See LICENSE.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 above copyright notice for more information.
##
## Copyright 2014 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
## Copyright 2014 UT-Battelle, LLC.
## Copyright 2014 Los Alamos National Security.
##
## Under the terms of Contract DE-NA0003525 with NTESS,
## the U.S. Government retains certain rights in this software.
##
## Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
## Laboratory (LANL), the U.S. Government retains certain rights in
## this software.
##============================================================================
# Try to find EGL library and include dir.
# Once done this will define
#
# EGL_FOUND - true if EGL has been found
# EGL_INCLUDE_DIRS - where the EGL/egl.h and KHR/khrplatform.h can be found
# EGL_LIBRARY - link this to use libEGL.so.1
# EGL_opengl_LIBRARY - link with these two libraries instead of the gl library
# EGL_gldispatch_LIBRARY for full OpenGL support through EGL
# EGL_LIBRARIES - all EGL related libraries: EGL, OpenGL, GLdispatch
if(NOT EGL_INCLUDE_DIR)
# If we have a root defined look there first
if(EGL_ROOT)
find_path(EGL_INCLUDE_DIR EGL/egl.h PATHS ${EGL_ROOT}/include
NO_DEFAULT_PATH
)
endif()
if(NOT EGL_INCLUDE_DIR)
find_path(EGL_INCLUDE_DIR EGL/egl.h PATHS
/usr/local/include
/usr/include
)
endif()
endif()
if(NOT EGL_LIBRARY)
# If we have a root defined look there first
if(EGL_ROOT)
find_library(EGL_LIBRARY EGL PATHS ${EGL_ROOT}/lib
NO_DEFAULT_PATH
)
endif()
if(NOT EGL_LIBRARY)
find_library(EGL_LIBRARY EGL PATHS
/usr/local/lib
/usr/lib
)
endif()
endif()
if(NOT EGL_opengl_LIBRARY)
# If we have a root defined look there first
if(EGL_ROOT)
find_library(EGL_opengl_LIBRARY OpenGL PATHS ${EGL_ROOT}/lib
NO_DEFAULT_PATH
)
endif()
if(NOT EGL_opengl_LIBRARY)
find_library(EGL_opengl_LIBRARY OpenGL PATHS
/usr/local/lib
/usr/lib
)
endif()
endif()
if(NOT EGL_gldispatch_LIBRARY)
# If we have a root defined look there first
if(EGL_ROOT)
find_library(EGL_gldispatch_LIBRARY GLdispatch PATHS ${EGL_ROOT}/lib
NO_DEFAULT_PATH
)
endif()
if(NOT EGL_gldispatch_LIBRARY)
find_library(EGL_gldispatch_LIBRARY GLdispatch PATHS
/usr/local/lib
/usr/lib
)
endif()
# For the NVIDIA 358 drivers there isn't a libGLdispath.so. The
# proper one gets installed as libGLdispatch.so.0.
if(NOT EGL_gldispatch_LIBRARY)
find_library(EGL_gldispatch_LIBRARY libGLdispatch.so.0 PATHS
/usr/local/lib
/usr/lib
)
endif()
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(EGL
FOUND_VAR EGL_FOUND
REQUIRED_VARS EGL_LIBRARY EGL_opengl_LIBRARY EGL_gldispatch_LIBRARY EGL_INCLUDE_DIR)
if(EGL_FOUND)
set(EGL_LIBRARIES ${EGL_LIBRARY} ${EGL_opengl_LIBRARY} ${EGL_gldispatch_LIBRARY})
set(EGL_INCLUDE_DIRS ${EGL_INCLUDE_DIR})
endif()
mark_as_advanced(EGL_DIR EGL_INCLUDE_DIR EGL_LIBRARY EGL_opengl_LIBRARY EGL_gldispatch_LIBRARY)
CMake/FindGLEW.cmake deleted 100644 → 0
View file @ 3be8b9c5
# - Find the OpenGL Extension Wrangler Library (GLEW)
# This module defines the following variables:
# GLEW_INCLUDE_DIRS - include directories for GLEW
# GLEW_LIBRARIES - libraries to link against GLEW
# GLEW_FOUND - true if GLEW has been found and can be used
#=============================================================================
# Copyright 2012 Benjamin Eikel
#
# CMake - Cross Platform Makefile Generator
# Copyright 2000-2011 Kitware, Inc., Insight Software Consortium
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# * Neither the names of Kitware, Inc., the Insight Software Consortium,
# nor the names of their contributors may be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# ------------------------------------------------------------------------------
#
# The above copyright and license notice applies to distributions of
# CMake in source and binary form. Some source files contain additional
# notices of original copyright by their contributors; see each source
# for details. Third-party software packages supplied with CMake under
# compatible licenses provide their own copyright notices documented in
# corresponding subdirectories.
#
# ------------------------------------------------------------------------------
#
# CMake was initially developed by Kitware with the following sponsorship:
#
# * National Library of Medicine at the National Institutes of Health
# as part of the Insight Segmentation and Registration Toolkit (ITK).
#
# * US National Labs (Los Alamos, Livermore, Sandia) ASC Parallel
# Visualization Initiative.
#
# * National Alliance for Medical Image Computing (NAMIC) is funded by the
# National Institutes of Health through the NIH Roadmap for Medical Research,
# Grant U54 EB005149.
#
# * Kitware, Inc.
find_path(GLEW_INCLUDE_DIR GL/glew.h)
find_library(GLEW_LIBRARY NAMES GLEW glew32 glew glew32s PATH_SUFFIXES lib64)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(GLEW
FOUND_VAR GLEW_FOUND
REQUIRED_VARS GLEW_INCLUDE_DIR GLEW_LIBRARY)
if(GLEW_FOUND)
set(GLEW_INCLUDE_DIRS ${GLEW_INCLUDE_DIR})
set(GLEW_LIBRARIES ${GLEW_LIBRARY})
endif()
mark_as_advanced(GLEW_INCLUDE_DIR GLEW_LIBRARY)
CMake/FindGLFW.cmake deleted 100644 → 0
View file @ 3be8b9c5
##=============================================================================
##
## Copyright (c) Kitware, Inc.
## All rights reserved.
## See LICENSE.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 above copyright notice for more information.
##
## Copyright 2016 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
## Copyright 2016 UT-Battelle, LLC.
## Copyright 2016 Los Alamos National Security.
##
## Under the terms of Contract DE-NA0003525 with NTESS,
## the U.S. Government retains certain rights in this software.
## Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
## Laboratory (LANL), the U.S. Government retains certain rights in
## this software.
##
##=============================================================================
# Try to find EGL library and include dir.
# Once done this will define
#
# GLFW_FOUND
# GLFW_INCLUDE_DIRS
# GLFW_LIBRARIES
#
include(FindPackageHandleStandardArgs)
if (WIN32)
find_path( GLFW_INCLUDE_DIR
NAMES
GLFW/glfw3.h
PATHS
${PROJECT_SOURCE_DIR}/shared_external/glfw/include
${PROJECT_SOURCE_DIR}/../shared_external/glfw/include
${GLFW_LOCATION}/include
$ENV{GLFW_LOCATION}/include
$ENV{PROGRAMFILES}/GLFW/include
${GLFW_LOCATION}
$ENV{GLFW_LOCATION}
DOC "The directory where GLFW/glfw3.h resides" )
if(ARCH STREQUAL "x86")
find_library( GLFW_LIBRARY
NAMES
glfw3
PATHS
${GLFW_LOCATION}/lib
$ENV{GLFW_LOCATION}/lib
$ENV{PROGRAMFILES}/GLFW/lib
DOC "The GLFW library")
else()
find_library( GLFW_LIBRARY
NAMES
glfw3
PATHS
${GLFW_LOCATION}/lib
$ENV{GLFW_LOCATION}/lib
$ENV{PROGRAMFILES}/GLFW/lib
DOC "The GLFW library")
endif()
endif ()
if (${CMAKE_HOST_UNIX})
find_path( GLFW_INCLUDE_DIR
NAMES
GLFW/glfw3.h
PATHS
${GLFW_LOCATION}/include
$ENV{GLFW_LOCATION}/include
/usr/include
/usr/local/include
/sw/include
/opt/local/include
NO_DEFAULT_PATH
DOC "The directory where GLFW/glfw3.h resides"
)
find_library( GLFW_LIBRARY
NAMES
glfw3 glfw
PATHS
${GLFW_LOCATION}/lib
$ENV{GLFW_LOCATION}/lib
/usr/lib64
/usr/lib
/usr/local/lib64
/usr/local/lib
/sw/lib
/opt/local/lib
/usr/lib/x86_64-linux-gnu
NO_DEFAULT_PATH
DOC "The GLFW library")
endif ()
find_package_handle_standard_args(GLFW
FOUND_VAR GLFW_FOUND
REQUIRED_VARS GLFW_INCLUDE_DIR GLFW_LIBRARY
)
if(GLFW_FOUND)
set(GLFW_LIBRARIES ${GLFW_LIBRARY})
set(GLFW_INCLUDE_DIRS ${GLFW_INCLUDE_DIR})
endif()
mark_as_advanced( GLFW_INCLUDE_DIR GLFW_LIBRARY )
CMake/FindOpenGL.cmake 0 → 100644
View file @ fef41372
##=============================================================================
##
## Copyright (c) Kitware, Inc.
## All rights reserved.
## See LICENSE.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 above copyright notice for more information.
##
## Copyright 2017 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
## Copyright 2017 UT-Battelle, LLC.
## Copyright 2017 Los Alamos National Security.
##
## Under the terms of Contract DE-NA0003525 with NTESS,
## the U.S. Government retains certain rights in this software.
## Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
## Laboratory (LANL), the U.S. Government retains certain rights in
## this software.
##
##=============================================================================
# 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 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::GL``
# ``OpenGL::GLU``
# Defined if the system has GLU.
# ``OpenGL::GLX``
# Defined if the system has 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).
#
# ``LEGACY``
# Prefer to use the legacy libGL library, if available.
# This is the default if no components were requested.
#
# 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()
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 )
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()
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)
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 /usr/X11R6/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 /usr/X11R6/include
)
# 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 /usr/X11R6/lib
${_OPENGL_LIB_PATH}
)
find_library(OPENGL_glx_LIBRARY
NAMES GLX
PATHS /usr/X11R6/lib
${_OPENGL_LIB_PATH}
)
find_library(OPENGL_egl_LIBRARY
NAMES EGL
PATHS ${_OPENGL_LIB_PATH}
)
find_library(OPENGL_glu_LIBRARY
NAMES GLU MesaGLU
PATHS ${OPENGL_gl_LIBRARY}
/opt/graphics/OpenGL/lib
/usr/openwin/lib
/usr/shlib /usr/X11R6/lib
)
if(NOT DEFINED OpenGL_GL_PREFERENCE)
set(OpenGL_GL_PREFERENCE "")
endif()
if(NOT OpenGL_GL_PREFERENCE STREQUAL "")
# A preference has been explicitly specified.
if(NOT OpenGL_GL_PREFERENCE MATCHES "^(GLVND|LEGACY)$")
message(FATAL_ERROR
"OpenGL_GL_PREFERENCE value '${OpenGL_GL_PREFERENCE}' not recognized. "
"Allowed values are 'GLVND' and 'LEGACY'."
)
endif()
elseif(OpenGL_FIND_COMPONENTS)
# No preference was explicitly specified, but the caller did request
# at least one GLVND component. Prefer GLVND for legacy GL.
set(OpenGL_GL_PREFERENCE "GLVND")
else()
# No preference was explicitly specified and no GLVND components were
# requested. Prefer libGL for legacy GL.
set(OpenGL_GL_PREFERENCE "LEGACY")
endif()
if("x${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 /usr/X11R6/lib
${_OPENGL_LIB_PATH}
)
endif()
# 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