Add GameMode support for Linux build (#796)

CMakeLists.txt

@@ -76,12 +76,14 @@ endif()
 
 if (UNIX AND NOT APPLE)
 	option(ENABLE_WAYLAND "Build with Wayland support" ON)
+	option(ENABLE_FERAL_GAMEMODE "Enables Feral Interactive GameMode Support" ON)
 endif()
 
 option(ENABLE_OPENGL "Enables the OpenGL backend" ON)
 option(ENABLE_VULKAN "Enables the Vulkan backend" ON)
 option(ENABLE_DISCORD_RPC "Enables the Discord Rich Presence feature" ON)
 
+
 # input backends
 if (WIN32)
 	option(ENABLE_XINPUT "Enables the usage of XInput" ON)
@@ -127,6 +129,7 @@ if (UNIX AND NOT APPLE)
 		add_compile_definitions(HAS_WAYLAND)
 	endif()
 	find_package(GTK3 REQUIRED)
+
 endif()
 
 if (ENABLE_VULKAN)
@@ -143,6 +146,14 @@ if (ENABLE_DISCORD_RPC)
 	target_include_directories(discord-rpc INTERFACE ./dependencies/discord-rpc/include)
 endif()
 
+if(UNIX AND NOT APPLE)
+	if(ENABLE_FERAL_GAMEMODE)
+		add_compile_definitions(ENABLE_FERAL_GAMEMODE)
+		add_subdirectory(dependencies/gamemode EXCLUDE_FROM_ALL)
+		target_include_directories(gamemode INTERFACE ./dependencies/gamemode/lib)
+	endif()
+endif()
+
 if (ENABLE_WXWIDGETS)
 	find_package(wxWidgets 3.2 REQUIRED COMPONENTS base core gl propgrid xrc)
 endif()

dependencies/gamemode/CMakeLists.txt

@@ -0,0 +1,4 @@
+project( gamemode LANGUAGES C )
+add_library (gamemode
+        "lib/gamemode_client.h"
+        "lib/client_loader.c")

dependencies/gamemode/lib/client_loader.c

@@ -0,0 +1,35 @@
+/*
+
+Copyright (c) 2017-2019, Feral Interactive
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+ * 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.
+ * Neither the name of Feral Interactive nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 OWNER OR 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.
+
+ */
+
+// Simply include the header with GAMEMODE_AUTO set
+// This will ensure it calls the functions when it's loaded
+#define GAMEMODE_AUTO
+#include "gamemode_client.h"