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# - Try to Find OpenGL
# Once done, this will define
#
# OPENGL_FOUND - system has OpenGL installed.
# OPENGL_INCLUDE_DIRS - directories which contain the OpenGL headers.
# OPENGL_LIBRARIES - libraries required to link against OpenGL.
# OPENGL_DEFINITIONS - Compiler switches required for using OpenGL.
#
# Copyright (C) 2015 Igalia S.L.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. 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.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND ITS 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 ITS
# 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.
find_package(PkgConfig)
pkg_check_modules(PC_OPENGL gl)
if (PC_OPENGL_FOUND)
set(OPENGL_DEFINITIONS ${PC_OPENGL_CFLAGS_OTHER})
endif ()
find_path(OPENGL_INCLUDE_DIRS NAMES GL/gl.h
HINTS ${PC_OPENGL_INCLUDEDIR} ${PC_OPENGL_INCLUDE_DIRS}
)
set(OPENGL_NAMES ${OPENGL_NAMES} gl GL)
find_library(OPENGL_LIBRARIES NAMES ${OPENGL_NAMES}
HINTS ${PC_OPENGL_LIBDIR} ${PC_OPENGL_LIBRARY_DIRS}
)
include(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(OPENGL DEFAULT_MSG OPENGL_INCLUDE_DIRS OPENGL_LIBRARIES)
mark_as_advanced(OPENGL_INCLUDE_DIRS OPENGL_LIBRARIES)
if (OPENGL_FOUND)
# We don't use find_package for GLX because it is part of -lGL, unlike EGL. We need to
# have OPENGL_INCLUDE_DIRS as part of the directories check_include_files() looks for in
# case OpenGL is installed into a non-standard location.
include(CMakePushCheckState)
CMAKE_PUSH_CHECK_STATE()
set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES} ${OPENGL_INCLUDE_DIRS})
include(CheckIncludeFiles)
check_include_files("GL/glx.h" GLX_FOUND)
CMAKE_POP_CHECK_STATE()
endif ()
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