From 13ba39cda89fab9bd02d6deb38551a46e035857d Mon Sep 17 00:00:00 2001
From: Jonathan Riddell <jr@jriddell.org>
Date: Wed, 26 Aug 2020 11:20:17 +0100
Subject: [PATCH] search for libdrm and libgbm in cmake, these packages are
 required to compile

---
 CMakeLists.txt         |   4 ++
 cmake/FindLibdrm.cmake | 105 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+)
 create mode 100644 cmake/FindLibdrm.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4553e9c87..ff88b1b91 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,6 +14,7 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 find_package(Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS Svg Widgets Quick QuickWidgets Concurrent Test Network)
 find_package(ECM ${KF5_MIN_VERSION} REQUIRED NO_MODULE)
 set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH})
+set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
 
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -110,6 +111,9 @@ find_package(PkgConfig REQUIRED)
 pkg_check_modules(PipeWire IMPORTED_TARGET libpipewire-0.3)
 add_feature_info(PipeWire PipeWire_FOUND "Required for Wayland screencasting")
 
+find_package(Libdrm REQUIRED)
+pkg_check_modules(gbm REQUIRED)
+
 find_package(QtWaylandScanner REQUIRED)
 find_package(PlasmaWaylandProtocols REQUIRED)
 find_package(Wayland REQUIRED COMPONENTS Client)
diff --git a/cmake/FindLibdrm.cmake b/cmake/FindLibdrm.cmake
new file mode 100644
index 000000000..9e9d7a646
--- /dev/null
+++ b/cmake/FindLibdrm.cmake
@@ -0,0 +1,105 @@
+#.rst:
+# FindLibdrm
+# -------
+#
+# Try to find libdrm on a Unix system.
+#
+# This will define the following variables:
+#
+# ``Libdrm_FOUND``
+#     True if (the requested version of) libdrm is available
+# ``Libdrm_VERSION``
+#     The version of libdrm
+# ``Libdrm_LIBRARIES``
+#     This can be passed to target_link_libraries() instead of the ``Libdrm::Libdrm``
+#     target
+# ``Libdrm_INCLUDE_DIRS``
+#     This should be passed to target_include_directories() if the target is not
+#     used for linking
+# ``Libdrm_DEFINITIONS``
+#     This should be passed to target_compile_options() if the target is not
+#     used for linking
+#
+# If ``Libdrm_FOUND`` is TRUE, it will also define the following imported target:
+#
+# ``Libdrm::Libdrm``
+#     The libdrm 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.
+
+#=============================================================================
+# SPDX-FileCopyrightText: 2014 Alex Merry <alex.merry@kde.org>
+# SPDX-FileCopyrightText: 2014 Martin Gräßlin <mgraesslin@kde.org>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#=============================================================================
+
+if(CMAKE_VERSION VERSION_LESS 2.8.12)
+    message(FATAL_ERROR "CMake 2.8.12 is required by FindLibdrm.cmake")
+endif()
+if(CMAKE_MINIMUM_REQUIRED_VERSION VERSION_LESS 2.8.12)
+    message(AUTHOR_WARNING "Your project should require at least CMake 2.8.12 to use FindLibdrm.cmake")
+endif()
+
+if(NOT WIN32)
+    # 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_Libdrm QUIET libdrm)
+
+    set(Libdrm_DEFINITIONS ${PKG_Libdrm_CFLAGS_OTHER})
+    set(Libdrm_VERSION ${PKG_Libdrm_VERSION})
+
+    find_path(Libdrm_INCLUDE_DIR
+        NAMES
+            xf86drm.h
+        HINTS
+            ${PKG_Libdrm_INCLUDE_DIRS}
+    )
+    find_library(Libdrm_LIBRARY
+        NAMES
+            drm
+        HINTS
+            ${PKG_Libdrm_LIBRARY_DIRS}
+    )
+
+    include(FindPackageHandleStandardArgs)
+    find_package_handle_standard_args(Libdrm
+        FOUND_VAR
+            Libdrm_FOUND
+        REQUIRED_VARS
+            Libdrm_LIBRARY
+            Libdrm_INCLUDE_DIR
+        VERSION_VAR
+            Libdrm_VERSION
+    )
+
+    if(Libdrm_FOUND AND NOT TARGET Libdrm::Libdrm)
+        add_library(Libdrm::Libdrm UNKNOWN IMPORTED)
+        set_target_properties(Libdrm::Libdrm PROPERTIES
+            IMPORTED_LOCATION "${Libdrm_LIBRARY}"
+            INTERFACE_COMPILE_OPTIONS "${Libdrm_DEFINITIONS}"
+            INTERFACE_INCLUDE_DIRECTORIES "${Libdrm_INCLUDE_DIR}"
+            INTERFACE_INCLUDE_DIRECTORIES "${Libdrm_INCLUDE_DIR}/libdrm"
+        )
+    endif()
+
+    mark_as_advanced(Libdrm_LIBRARY Libdrm_INCLUDE_DIR)
+
+    # compatibility variables
+    set(Libdrm_LIBRARIES ${Libdrm_LIBRARY})
+    set(Libdrm_INCLUDE_DIRS ${Libdrm_INCLUDE_DIR} "${Libdrm_INCLUDE_DIR}/libdrm")
+    set(Libdrm_VERSION_STRING ${Libdrm_VERSION})
+
+else()
+    message(STATUS "FindLibdrm.cmake cannot find libdrm on Windows systems.")
+    set(Libdrm_FOUND FALSE)
+endif()
+
+include(FeatureSummary)
+set_package_properties(Libdrm PROPERTIES
+    URL "https://wiki.freedesktop.org/dri/"
+    DESCRIPTION "Userspace interface to kernel DRM services."
+)