libobs: Add a Wayland platform

Introduce the OBS_NIX_PLATFORM_WAYLAND enum value, and try to detect
it when OBS Studio runs by looking into the platform name.

CMakeLists.txt

@@ -202,6 +202,8 @@ if(APPLE)
 	list(APPEND CMAKE_INSTALL_RPATH "@loader_path/" "@executable_path/")
 elseif(UNIX)
 	option(USE_XDG "Utilize XDG Base Directory Specification" ON)
+	option(ENABLE_WAYLAND "Build support for Wayland" ON)
+
 	if(USE_XDG)
 		add_definitions(-DUSE_XDG)
 	endif()

UI/CMakeLists.txt

@@ -396,6 +396,16 @@ if(WIN32)
 			OUTPUT_NAME "obs${_output_suffix}")
 endif()
 
+if (ENABLE_WAYLAND)
+	find_package(Qt5Gui REQUIRED)
+	include_directories(${Qt5Gui_PRIVATE_INCLUDE_DIRS})
+
+	set(obs_PLATFORM_LIBRARIES
+		${obs_PLATFORM_LIBRARIES}
+		Qt5::Gui
+		Qt5::GuiPrivate)
+endif()
+
 target_link_libraries(obs
 	libobs
 	Qt5::Widgets

UI/obs-app.cpp

@@ -61,6 +61,11 @@
 #if !defined(_WIN32) && !defined(__APPLE__)
 #include <obs-nix-platform.h>
 #include <QX11Info>
+
+#ifdef ENABLE_WAYLAND
+#include <qpa/qplatformnativeinterface.h>
+#endif
+
 #endif
 
 #include <iostream>
@@ -1398,6 +1403,18 @@ bool OBSApp::OBSInit()
 		}
 		obs_set_nix_platform_display(QX11Info::display());
 	}
+
+#ifdef ENABLE_WAYLAND
+	if (QApplication::platformName().contains("wayland")) {
+		obs_set_nix_platform(OBS_NIX_PLATFORM_WAYLAND);
+		QPlatformNativeInterface *native =
+			QGuiApplication::platformNativeInterface();
+		obs_set_nix_platform_display(
+			native->nativeResourceForIntegration("display"));
+
+		blog(LOG_INFO, "Platform: Wayland");
+	}
+#endif
 #endif
 
 	if (!StartupOBS(locale.c_str(), GetProfilerNameStore()))

cmake/Modules/FindWayland.cmake

@@ -0,0 +1,78 @@
+# Try to find Wayland on a Unix system
+#
+# This will define:
+#
+#   WAYLAND_FOUND        - True if Wayland is found
+#   WAYLAND_LIBRARIES    - Link these to use Wayland
+#   WAYLAND_INCLUDE_DIRS - Include directory for Wayland
+#   WAYLAND_DEFINITIONS  - Compiler flags for using Wayland
+#
+# In addition the following more fine grained variables will be defined:
+#
+#   Wayland_Client_FOUND  WAYLAND_CLIENT_INCLUDE_DIRS  WAYLAND_CLIENT_LIBRARIES
+#   Wayland_Server_FOUND  WAYLAND_SERVER_INCLUDE_DIRS  WAYLAND_SERVER_LIBRARIES
+#   Wayland_EGL_FOUND     WAYLAND_EGL_INCLUDE_DIRS     WAYLAND_EGL_LIBRARIES
+#   Wayland_Cursor_FOUND  WAYLAND_CURSOR_INCLUDE_DIRS  WAYLAND_CURSOR_LIBRARIES
+#
+# Copyright (c) 2013 Martin Gräßlin <[email protected]>
+#               2020 Georges Basile Stavracas Neto <[email protected]>
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+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_WAYLAND QUIET wayland-client wayland-server wayland-egl wayland-cursor)
+
+  set(WAYLAND_DEFINITIONS ${PKG_WAYLAND_CFLAGS})
+
+  find_path(WAYLAND_CLIENT_INCLUDE_DIRS NAMES wayland-client.h HINTS ${PKG_WAYLAND_INCLUDE_DIRS})
+  find_library(WAYLAND_CLIENT_LIBRARIES NAMES wayland-client   HINTS ${PKG_WAYLAND_LIBRARY_DIRS})
+  if(WAYLAND_CLIENT_INCLUDE_DIRS AND WAYLAND_CLIENT_LIBRARIES)
+    set(Wayland_Client_FOUND TRUE)
+  else()
+    set(Wayland_Client_FOUND FALSE)
+  endif()
+  mark_as_advanced(WAYLAND_CLIENT_INCLUDE_DIRS WAYLAND_CLIENT_LIBRARIES)
+
+  find_path(WAYLAND_CURSOR_INCLUDE_DIRS NAMES wayland-cursor.h HINTS ${PKG_WAYLAND_INCLUDE_DIRS})
+  find_library(WAYLAND_CURSOR_LIBRARIES NAMES wayland-cursor   HINTS ${PKG_WAYLAND_LIBRARY_DIRS})
+  if(WAYLAND_CURSOR_INCLUDE_DIRS AND WAYLAND_CURSOR_LIBRARIES)
+    set(Wayland_Cursor_FOUND TRUE)
+  else()
+    set(Wayland_Cursor_FOUND FALSE)
+  endif()
+  mark_as_advanced(WAYLAND_CURSOR_INCLUDE_DIRS WAYLAND_CURSOR_LIBRARIES)
+
+  find_path(WAYLAND_EGL_INCLUDE_DIRS    NAMES wayland-egl.h    HINTS ${PKG_WAYLAND_INCLUDE_DIRS})
+  find_library(WAYLAND_EGL_LIBRARIES    NAMES wayland-egl      HINTS ${PKG_WAYLAND_LIBRARY_DIRS})
+  if(WAYLAND_EGL_INCLUDE_DIRS AND WAYLAND_EGL_LIBRARIES)
+    set(Wayland_EGL_FOUND TRUE)
+  else()
+    set(Wayland_EGL_FOUND FALSE)
+  endif()
+  mark_as_advanced(WAYLAND_EGL_INCLUDE_DIRS WAYLAND_EGL_LIBRARIES)
+
+  find_path(WAYLAND_SERVER_INCLUDE_DIRS NAMES wayland-server.h HINTS ${PKG_WAYLAND_INCLUDE_DIRS})
+  find_library(WAYLAND_SERVER_LIBRARIES NAMES wayland-server   HINTS ${PKG_WAYLAND_LIBRARY_DIRS})
+  if(WAYLAND_SERVER_INCLUDE_DIRS AND WAYLAND_SERVER_LIBRARIES)
+    set(Wayland_Server_FOUND TRUE)
+  else()
+    set(Wayland_Server_FOUND FALSE)
+  endif()
+  mark_as_advanced(WAYLAND_SERVER_INCLUDE_DIRS WAYLAND_SERVER_LIBRARIES)
+
+  set(WAYLAND_INCLUDE_DIRS ${WAYLAND_CLIENT_INCLUDE_DIRS} ${WAYLAND_SERVER_INCLUDE_DIRS} ${WAYLAND_EGL_INCLUDE_DIRS} ${WAYLAND_CURSOR_INCLUDE_DIRS})
+  set(WAYLAND_LIBRARIES ${WAYLAND_CLIENT_LIBRARIES} ${WAYLAND_SERVER_LIBRARIES} ${WAYLAND_EGL_LIBRARIES} ${WAYLAND_CURSOR_LIBRARIES})
+  mark_as_advanced(WAYLAND_INCLUDE_DIRS WAYLAND_LIBRARIES)
+
+  list(REMOVE_DUPLICATES WAYLAND_INCLUDE_DIRS)
+
+  include(FindPackageHandleStandardArgs)
+
+  find_package_handle_standard_args(Wayland REQUIRED_VARS WAYLAND_LIBRARIES WAYLAND_INCLUDE_DIRS HANDLE_COMPONENTS)
+
+ENDIF ()

libobs-opengl/CMakeLists.txt

@@ -28,7 +28,7 @@ elseif(APPLE)
 		${COCOA}
 		${IOSURF}
 		${OPENGL_gl_LIBRARY})
-else() #This needs to change to be more specific to get ready for Wayland
+else()
 	find_package(XCB COMPONENTS XCB REQUIRED)
 	find_package(X11_XCB REQUIRED)
 

libobs-opengl/gl-nix.c

@@ -32,6 +32,11 @@ static void init_winsys(void)
 	case OBS_NIX_PLATFORM_X11_EGL:
 		gl_vtable = gl_x11_egl_get_winsys_vtable();
 		break;
+#ifdef ENABLE_WAYLAND
+	case OBS_NIX_PLATFORM_WAYLAND:
+		blog(LOG_ERROR, "EGL/Wayland not implemented yet");
+		break;
+#endif
 	}
 
 	assert(gl_vtable != NULL);

libobs/CMakeLists.txt

@@ -197,6 +197,21 @@ elseif(UNIX)
 		util/threading-posix.h
 		obs-nix-platform.h)
 
+	if(ENABLE_WAYLAND)
+		find_package(Wayland COMPONENTS Client REQUIRED)
+
+		set(libobs_PLATFORM_SOURCES ${libobs_PLATFORM_SOURCES}
+			obs-nix-wayland.c)
+
+		include_directories(
+			${WAYLAND_CLIENT_INCLUDE_DIR})
+		add_definitions(
+			${WAYLAND_DEFINITIONS})
+		set(libobs_PLATFORM_DEPS
+			${libobs_PLATFORM_DEPS}
+			${WAYLAND_CLIENT_LIBRARIES})
+	endif()
+
 	if(HAVE_PULSEAUDIO)
 		set(libobs_audio_monitoring_HEADERS
 			audio-monitoring/pulse/pulseaudio-wrapper.h)

libobs/obs-nix-platform.h

@@ -26,6 +26,10 @@ extern "C" {
 enum obs_nix_platform_type {
 	OBS_NIX_PLATFORM_X11_GLX,
 	OBS_NIX_PLATFORM_X11_EGL,
+#ifdef ENABLE_WAYLAND
+	OBS_NIX_PLATFORM_WAYLAND,
+#endif
+
 };
 
 /**

libobs/obs-nix-wayland.c

@@ -0,0 +1,88 @@
+/******************************************************************************
+    Copyright (C) 2019 by Jason Francis <[email protected]>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+******************************************************************************/
+
+#include "obs-internal.h"
+#include "obs-nix-platform.h"
+#include "obs-nix-wayland.h"
+
+#include <wayland-client.h>
+
+void obs_nix_wayland_log_info(void)
+{
+	struct wl_display *display = obs_get_nix_platform_display();
+	if (display == NULL) {
+		blog(LOG_INFO, "Unable to connect to Wayland server");
+		return;
+	}
+	//TODO: query some information about the wayland server if possible
+	blog(LOG_INFO, "Connected to Wayland server");
+}
+
+static bool
+obs_nix_wayland_hotkeys_platform_init(struct obs_core_hotkeys *hotkeys)
+{
+	UNUSED_PARAMETER(hotkeys);
+	return true;
+}
+
+static void
+obs_nix_wayland_hotkeys_platform_free(struct obs_core_hotkeys *hotkeys)
+{
+	UNUSED_PARAMETER(hotkeys);
+}
+
+static bool
+obs_nix_wayland_hotkeys_platform_is_pressed(obs_hotkeys_platform_t *context,
+					    obs_key_t key)
+{
+	UNUSED_PARAMETER(context);
+	UNUSED_PARAMETER(key);
+	return false;
+}
+
+static void obs_nix_wayland_key_to_str(obs_key_t key, struct dstr *dstr)
+{
+	UNUSED_PARAMETER(key);
+	UNUSED_PARAMETER(dstr);
+}
+
+static obs_key_t obs_nix_wayland_key_from_virtual_key(int sym)
+{
+	UNUSED_PARAMETER(sym);
+	return OBS_KEY_NONE;
+}
+
+static int obs_nix_wayland_key_to_virtual_key(obs_key_t key)
+{
+	UNUSED_PARAMETER(key);
+	return 0;
+}
+
+static const struct obs_nix_hotkeys_vtable wayland_hotkeys_vtable = {
+	.init = obs_nix_wayland_hotkeys_platform_init,
+	.free = obs_nix_wayland_hotkeys_platform_free,
+	.is_pressed = obs_nix_wayland_hotkeys_platform_is_pressed,
+	.key_to_str = obs_nix_wayland_key_to_str,
+	.key_from_virtual_key = obs_nix_wayland_key_from_virtual_key,
+	.key_to_virtual_key = obs_nix_wayland_key_to_virtual_key,
+
+};
+
+const struct obs_nix_hotkeys_vtable *obs_nix_wayland_get_hotkeys_vtable(void)
+{
+	return &wayland_hotkeys_vtable;
+}

libobs/obs-nix-wayland.h

@@ -0,0 +1,24 @@
+/******************************************************************************
+    Copyright (C) 2019 by Jason Francis <[email protected]>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+******************************************************************************/
+
+#pragma once
+
+#include "obs-nix.h"
+
+void obs_nix_wayland_log_info(void);
+
+const struct obs_nix_hotkeys_vtable *obs_nix_wayland_get_hotkeys_vtable(void);

libobs/obs-nix.c

@@ -20,6 +20,11 @@
 #include "obs-nix.h"
 #include "obs-nix-platform.h"
 #include "obs-nix-x11.h"
+
+#ifdef ENABLE_WAYLAND
+#include "obs-nix-wayland.h"
+#endif
+
 #if defined(__FreeBSD__)
 #define _GNU_SOURCE
 #endif
@@ -322,6 +327,10 @@ void log_system_info(void)
 	case OBS_NIX_PLATFORM_X11_EGL:
 		obs_nix_x11_log_info();
 		break;
+#ifdef ENABLE_WAYLAND
+	case OBS_NIX_PLATFORM_WAYLAND:
+		break;
+#endif
 	}
 }
 
@@ -332,6 +341,11 @@ bool obs_hotkeys_platform_init(struct obs_core_hotkeys *hotkeys)
 	case OBS_NIX_PLATFORM_X11_EGL:
 		hotkeys_vtable = obs_nix_x11_get_hotkeys_vtable();
 		break;
+#ifdef ENABLE_WAYLAND
+	case OBS_NIX_PLATFORM_WAYLAND:
+		hotkeys_vtable = obs_nix_wayland_get_hotkeys_vtable();
+		break;
+#endif
 	}
 
 	return hotkeys_vtable->init(hotkeys);

libobs/obsconfig.h.in

@@ -22,6 +22,8 @@
 #define LIBOBS_IMAGEMAGICK_DIR_STYLE_7GE 7
 #define LIBOBS_IMAGEMAGICK_DIR_STYLE @LIBOBS_IMAGEMAGICK_DIR_STYLE@
 
+#cmakedefine ENABLE_WAYLAND
+
 /* NOTE: Release candidate version numbers internally are always the previous
  * main release number!  For example, if the current public release is 21.0 and
  * the build is 22.0 release candidate 1, internally the build number (defined