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build: Add FindEGL.cmake from KDE's extra-cmake-modules
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Ryan Pavlik
parent
47f704277a
commit
a8ac420f06
172
cmake/FindEGL.cmake
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172
cmake/FindEGL.cmake
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#.rst:
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# FindEGL
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# -------
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#
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# Try to find EGL.
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#
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# This will define the following variables:
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#
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# ``EGL_FOUND``
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# True if (the requested version of) EGL is available
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# ``EGL_VERSION``
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# The version of EGL; note that this is the API version defined in the
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# headers, rather than the version of the implementation (eg: Mesa)
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# ``EGL_LIBRARIES``
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# This can be passed to target_link_libraries() instead of the ``EGL::EGL``
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# target
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# ``EGL_INCLUDE_DIRS``
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# This should be passed to target_include_directories() if the target is not
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# used for linking
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# ``EGL_DEFINITIONS``
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# This should be passed to target_compile_options() if the target is not
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# used for linking
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#
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# If ``EGL_FOUND`` is TRUE, it will also define the following imported target:
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#
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# ``EGL::EGL``
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# The EGL library
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#
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# In general we recommend using the imported target, as it is easier to use.
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# Bear in mind, however, that if the target is in the link interface of an
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# exported library, it must be made available by the package config file.
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#
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# Since pre-1.0.0.
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#=============================================================================
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# Copyright 2014 Alex Merry <alex.merry@kde.org>
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# Copyright 2014 Martin Gräßlin <mgraesslin@kde.org>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. The name of the author may not be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#=============================================================================
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include(${CMAKE_CURRENT_LIST_DIR}/ECMFindModuleHelpersStub.cmake)
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include(CheckCXXSourceCompiles)
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include(CMakePushCheckState)
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ecm_find_package_version_check(EGL)
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# Use pkg-config to get the directories and then use these values
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# in the FIND_PATH() and FIND_LIBRARY() calls
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find_package(PkgConfig)
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pkg_check_modules(PKG_EGL QUIET egl)
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set(EGL_DEFINITIONS ${PKG_EGL_CFLAGS_OTHER})
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find_path(EGL_INCLUDE_DIR
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NAMES
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EGL/egl.h
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HINTS
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${PKG_EGL_INCLUDE_DIRS}
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)
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find_library(EGL_LIBRARY
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NAMES
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EGL
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HINTS
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${PKG_EGL_LIBRARY_DIRS}
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)
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# NB: We do *not* use the version information from pkg-config, as that
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# is the implementation version (eg: the Mesa version)
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if(EGL_INCLUDE_DIR)
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# egl.h has defines of the form EGL_VERSION_x_y for each supported
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# version; so the header for EGL 1.1 will define EGL_VERSION_1_0 and
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# EGL_VERSION_1_1. Finding the highest supported version involves
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# finding all these defines and selecting the highest numbered.
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file(READ "${EGL_INCLUDE_DIR}/EGL/egl.h" _EGL_header_contents)
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string(REGEX MATCHALL
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"[ \t]EGL_VERSION_[0-9_]+"
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_EGL_version_lines
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"${_EGL_header_contents}"
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)
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unset(_EGL_header_contents)
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foreach(_EGL_version_line ${_EGL_version_lines})
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string(REGEX REPLACE
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"[ \t]EGL_VERSION_([0-9_]+)"
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"\\1"
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_version_candidate
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"${_EGL_version_line}"
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)
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string(REPLACE "_" "." _version_candidate "${_version_candidate}")
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if(NOT DEFINED EGL_VERSION OR EGL_VERSION VERSION_LESS _version_candidate)
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set(EGL_VERSION "${_version_candidate}")
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endif()
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endforeach()
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unset(_EGL_version_lines)
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endif()
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cmake_push_check_state(RESET)
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list(APPEND CMAKE_REQUIRED_LIBRARIES "${EGL_LIBRARY}")
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list(APPEND CMAKE_REQUIRED_INCLUDES "${EGL_INCLUDE_DIR}")
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check_cxx_source_compiles("
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#include <EGL/egl.h>
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int main(int argc, char *argv[]) {
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EGLint x = 0; EGLDisplay dpy = 0; EGLContext ctx = 0;
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eglDestroyContext(dpy, ctx);
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}" HAVE_EGL)
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cmake_pop_check_state()
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set(required_vars EGL_INCLUDE_DIR HAVE_EGL)
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if(NOT EMSCRIPTEN)
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list(APPEND required_vars EGL_LIBRARY)
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(EGL
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FOUND_VAR
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EGL_FOUND
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REQUIRED_VARS
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${required_vars}
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VERSION_VAR
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EGL_VERSION
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)
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if(EGL_FOUND AND NOT TARGET EGL::EGL)
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if (EMSCRIPTEN)
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add_library(EGL::EGL INTERFACE IMPORTED)
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# Nothing further to be done, system include paths have headers and linkage is implicit.
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else()
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add_library(EGL::EGL UNKNOWN IMPORTED)
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set_target_properties(EGL::EGL PROPERTIES
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IMPORTED_LOCATION "${EGL_LIBRARY}"
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INTERFACE_COMPILE_OPTIONS "${EGL_DEFINITIONS}"
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INTERFACE_INCLUDE_DIRECTORIES "${EGL_INCLUDE_DIR}"
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)
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endif()
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endif()
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mark_as_advanced(EGL_LIBRARY EGL_INCLUDE_DIR HAVE_EGL)
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# compatibility variables
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set(EGL_LIBRARIES ${EGL_LIBRARY})
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set(EGL_INCLUDE_DIRS ${EGL_INCLUDE_DIR})
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set(EGL_VERSION_STRING ${EGL_VERSION})
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include(FeatureSummary)
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set_package_properties(EGL PROPERTIES
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URL "https://www.khronos.org/egl/"
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DESCRIPTION "A platform-agnostic mechanism for creating rendering surfaces for use with other graphics libraries, such as OpenGL|ES and OpenVG."
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)
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