Replace "our" FindEGL.cmake with the ECM version

The ECM version now also does a compile test, which was the only real
"functional" difference.

Change-Id: I1d5cd590359feba7c7a38ff374992349d5943070
Reviewed-by: Volker Krause <volker.krause@kdab.com>

1 files changed, 166 insertions, 0 deletions

diff --git a/cmake/3rdparty/extra-cmake-modules/find-modules/FindEGL.cmake b/cmake/3rdparty/extra-cmake-modules/find-modules/FindEGL.cmake
new file mode 100644
index 0000000000..5277d12378
--- /dev/null
+++ b/cmake/3rdparty/extra-cmake-modules/find-modules/FindEGL.cmake
@@ -0,0 +1,166 @@
+#.rst:
+# FindEGL
+# -------
+#
+# Try to find EGL.
+#
+# This will define the following variables:
+#
+# ``EGL_FOUND``
+#     True if (the requested version of) EGL is available
+# ``EGL_VERSION``
+#     The version of EGL; note that this is the API version defined in the
+#     headers, rather than the version of the implementation (eg: Mesa)
+# ``EGL_LIBRARIES``
+#     This can be passed to target_link_libraries() instead of the ``EGL::EGL``
+#     target
+# ``EGL_INCLUDE_DIRS``
+#     This should be passed to target_include_directories() if the target is not
+#     used for linking
+# ``EGL_DEFINITIONS``
+#     This should be passed to target_compile_options() if the target is not
+#     used for linking
+#
+# If ``EGL_FOUND`` is TRUE, it will also define the following imported target:
+#
+# ``EGL::EGL``
+#     The EGL library
+#
+# In general we recommend using the imported target, as it is easier to use.
+# Bear in mind, however, that if the target is in the link interface of an
+# exported library, it must be made available by the package config file.
+#
+# Since pre-1.0.0.
+
+#=============================================================================
+# Copyright 2014 Alex Merry <alex.merry@kde.org>
+# Copyright 2014 Martin Gräßlin <mgraesslin@kde.org>
+#
+# 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 copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. The name of the author may not be used to endorse or promote products
+#    derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+#=============================================================================
+
+include(${CMAKE_CURRENT_LIST_DIR}/ECMFindModuleHelpersStub.cmake)
+include(CheckCXXSourceCompiles)
+include(CMakePushCheckState)
+
+ecm_find_package_version_check(EGL)
+
+# Use pkg-config to get the directories and then use these values
+# in the FIND_PATH() and FIND_LIBRARY() calls
+find_package(PkgConfig)
+pkg_check_modules(PKG_EGL QUIET egl)
+
+set(EGL_DEFINITIONS ${PKG_EGL_CFLAGS_OTHER})
+
+find_path(EGL_INCLUDE_DIR
+    NAMES
+        egl.h
+    HINTS
+        ${PKG_EGL_INCLUDE_DIRS}
+    PATH_SUFFIXES
+        EGL
+)
+find_library(EGL_LIBRARY
+    NAMES
+        EGL
+    HINTS
+        ${PKG_EGL_LIBRARY_DIRS}
+)
+
+# NB: We do *not* use the version information from pkg-config, as that
+#     is the implementation version (eg: the Mesa version)
+if(EGL_INCLUDE_DIR)
+    # egl.h has defines of the form EGL_VERSION_x_y for each supported
+    # version; so the header for EGL 1.1 will define EGL_VERSION_1_0 and
+    # EGL_VERSION_1_1.  Finding the highest supported version involves
+    # finding all these defines and selecting the highest numbered.
+    file(READ "${EGL_INCLUDE_DIR}/egl.h" _EGL_header_contents)
+    string(REGEX MATCHALL
+        "[ \t]EGL_VERSION_[0-9_]+"
+        _EGL_version_lines
+        "${_EGL_header_contents}"
+    )
+    unset(_EGL_header_contents)
+    foreach(_EGL_version_line ${_EGL_version_lines})
+        string(REGEX REPLACE
+            "[ \t]EGL_VERSION_([0-9_]+)"
+            "\\1"
+            _version_candidate
+            "${_EGL_version_line}"
+        )
+        string(REPLACE "_" "." _version_candidate "${_version_candidate}")
+        if(NOT DEFINED EGL_VERSION OR EGL_VERSION VERSION_LESS _version_candidate)
+            set(EGL_VERSION "${_version_candidate}")
+        endif()
+    endforeach()
+    unset(_EGL_version_lines)
+endif()
+
+cmake_push_check_state(RESET)
+list(APPEND CMAKE_REQUIRED_LIBRARIES "${EGL_LIBRARY}")
+list(APPEND CMAKE_REQUIRED_INCLUDES "${EGL_INCLUDE_DIR}")
+
+check_cxx_source_compiles("
+#include <EGL/egl.h>
+
+int main(int argc, char *argv[]) {
+    EGLint x = 0; EGLDisplay dpy = 0; EGLContext ctx = 0;
+    eglDestroyContext(dpy, ctx);
+}" HAVE_EGL)
+
+cmake_pop_check_state()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(EGL
+    FOUND_VAR
+        EGL_FOUND
+    REQUIRED_VARS
+        EGL_LIBRARY
+        EGL_INCLUDE_DIR
+        HAVE_EGL
+    VERSION_VAR
+        EGL_VERSION
+)
+
+if(EGL_FOUND AND NOT TARGET EGL::EGL)
+    add_library(EGL::EGL UNKNOWN IMPORTED)
+    set_target_properties(EGL::EGL PROPERTIES
+        IMPORTED_LOCATION "${EGL_LIBRARY}"
+        INTERFACE_COMPILE_OPTIONS "${EGL_DEFINITIONS}"
+        INTERFACE_INCLUDE_DIRECTORIES "${EGL_INCLUDE_DIR}"
+    )
+endif()
+
+mark_as_advanced(EGL_LIBRARY EGL_INCLUDE_DIR HAVE_EGL)
+
+# compatibility variables
+set(EGL_LIBRARIES ${EGL_LIBRARY})
+set(EGL_INCLUDE_DIRS ${EGL_INCLUDE_DIR})
+set(EGL_VERSION_STRING ${EGL_VERSION})
+
+include(FeatureSummary)
+set_package_properties(EGL PROPERTIES
+    URL "https://www.khronos.org/egl/"
+    DESCRIPTION "A platform-agnostic mechanism for creating rendering surfaces for use with other graphics libraries, such as OpenGL|ES and OpenVG."
+)