Add conanfile.py to support building with Conan

Support building qt3d with conan against Qt6 base
binary package.

The build recipe expects to locate QT_PATH from env.
The 'qt-cmake(.bat)' is used for the build.

'CMAKE_TOOLCHAIN_FILE' is used to pick the toolchain
file for cross compilations.

For Android builds 'ANDROID_SDK_ROOT' and
'ANDROID_NDK_ROOT' need to be passed from env.

The qt3d build expects the following from env:
  - QT_FEATURE_qt3d_assimp
  - QT_FEATURE_qt3d_opengl_renderer
  - QT_FEATURE_qt3d_rhi_renderer

Change-Id: I9d1bea5e40f0196f02d8cdd8ef0d0b03b8b5c45b
Reviewed-by: Mike Krus <mike.krus@kdab.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/conanfile.py b/conanfile.py
new file mode 100644
index 000000000..42558025f
--- /dev/null
+++ b/conanfile.py
@@ -0,0 +1,122 @@
+#############################################################################
+##
+## Copyright (C) 2020 The Qt Company Ltd.
+## Contact: https://www.qt.io/licensing/
+##
+## This file is part of the release tools of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:GPL-EXCEPT$
+## Commercial License Usage
+## Licensees holding valid commercial Qt licenses may use this file in
+## accordance with the commercial license agreement provided with the
+## Software or, alternatively, in accordance with the terms contained in
+## a written agreement between you and The Qt Company. For licensing terms
+## and conditions see https://www.qt.io/terms-conditions. For further
+## information use the contact form at https://www.qt.io/contact-us.
+##
+## GNU General Public License Usage
+## Alternatively, this file may be used under the terms of the GNU
+## General Public License version 3 as published by the Free Software
+## Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+## included in the packaging of this file. Please review the following
+## information to ensure the GNU General Public License requirements will
+## be met: https://www.gnu.org/licenses/gpl-3.0.html.
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+from conans import ConanFile, tools, CMake
+import os
+
+
+class QtConanError(Exception):
+    pass
+
+
+class Qt3D(ConanFile):
+    name = "qt3d"
+    version = "6.0.0"
+    license = "LGPL-3.0+, GPL-2.0+, Commercial Qt License Agreement"
+    author = "The Qt Company <https://www.qt.io/contact-us>"
+    url = "https://code.qt.io/cgit/qt/qt3d.git/"
+    description = "Qt 3D provides functionality for near-realtime simulation systems with support for 2D and 3D rendering in both Qt C++ and Qt Quick applications."
+    topics = ("qt", "qt6", "3d", "qtquick")
+    settings = "os", "compiler", "build_type", "arch"
+    options = {"shared": [True, False],
+               "qt6": "ANY"}  # this is needed to model unique package_id for the Add-on build per used Qt6 version
+    default_options = {"shared": False,
+                       "qt6": None}
+    exports_sources = "*", "!conan*.*"
+
+    def source(self):
+        # sources are installed next to recipe, no need to clone etc. sources here
+        pass
+
+    def _get_cmake_prefix_path(self):
+        # 'QT_PATH' provided as env variable in profile file which is part of the Qt essential binary
+        # package(s). Installed under .conan/profiles
+        cmake_prefix_path = os.environ.get("QT_PATH")
+        if not cmake_prefix_path:
+            raise QtConanError("'QT_PATH' not defined! The 'QT_PATH' needs to point to Qt installation directory.")
+        print(f"CMAKE_PREFIX_PATH for '{self.name}/{self.version}' build is: {cmake_prefix_path}")
+        return cmake_prefix_path
+
+    def _read_env(self, key):
+        value = os.environ.get(key)
+        if not value:
+            raise QtConanError(f"{self.settings.os} build specified but '{key}' was not defined?")
+        return value
+
+    def _get_qtcmake(self):
+        qt_install_path = self._get_cmake_prefix_path()
+        ext = ".bat" if tools.os_info.is_windows else ""
+        qtcmake = os.path.abspath(os.path.join(qt_install_path, "bin", "qt-cmake" + ext))
+        if not os.path.exists(qtcmake):
+            raise QtConanError(f"Unable to locate {qtcmake} from 'QT_PATH': {qt_install_path}")
+        return qtcmake
+
+    def _get_cmake_tool(self):
+        cmake = CMake(self, cmake_program=self._get_qtcmake())
+        cmake.verbose = True
+
+        # Qt modules need to be 'installed'.
+        # We need to direct the 'make install' to some directory under Conan cache,
+        # place it under the current build directory which is also under the Conan cache.
+        # Note, the actual 'make install' is called in "package()".
+        install_dir = os.path.join(os.getcwd(), "_install_tmp")
+        cmake.definitions["CMAKE_INSTALL_PREFIX"] = install_dir
+
+        cmake_toolchain_file = os.environ.get("CMAKE_TOOLCHAIN_FILE")
+        if cmake_toolchain_file:
+            cmake.definitions["CMAKE_TOOLCHAIN_FILE"] = cmake_toolchain_file
+
+        if self.settings.os == "Android":
+            cmake.definitions["ANDROID_SDK_ROOT"] = self._read_env('ANDROID_SDK_ROOT')
+            cmake.definitions["ANDROID_NDK_ROOT"] = self._read_env('ANDROID_NDK_ROOT')
+
+        for c in [ 'assimp', 'opengl_renderer', 'rhi_renderer']:
+            value = os.environ.get('qt3d_' + c)
+            if value:
+                cmake.definitions["QT_FEATURE_qt3d_" + c] = value
+
+        return cmake
+
+    def build(self):
+        cmake = self._get_cmake_tool()
+        self.run('%s "%s" %s' % (self._get_qtcmake(), self.source_folder, cmake.command_line))
+        self.run('cmake --build . %s' % cmake.build_config)
+        return
+
+    def package(self):
+        install_dir = os.path.join(os.getcwd(), "_install_tmp")  # see 'CMAKE_INSTALL_PREFIX' above
+        self.run('cmake --build . --target install')
+        self.copy("*", src=install_dir, dst=".")
+
+    def package_info(self):
+        self.cpp_info.libs = ["Qt63D"]  # used for the actual library filename, Ordered list with the library names
+
+    def deploy(self):
+        self.copy("*")  # copy from current package
+        self.copy_deps("*")  # copy from dependencies
+