From 628e9bad92673c27a974649ee18c48483003347a Mon Sep 17 00:00:00 2001
From: Ryan Houdek <Sonicadvance1@gmail.com>
Date: Tue, 26 Jan 2016 07:35:17 -0600
Subject: [PATCH] Support a headless EGL option.

This is a new option to support completely headless running of Dolphin without X11 on systems that can properly support it.
---
 CMakeLists.txt                                   | 12 +++++++++++-
 Source/Core/Common/GL/GLInterface/EGL.h          |  2 +-
 .../Core/Common/GL/GLInterface/GLInterface.cpp   |  4 ++++
 Source/Core/DolphinWX/CMakeLists.txt             |  2 +-
 Source/Core/DolphinWX/MainNoGUI.cpp              | 16 +++++++++-------
 5 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 47ad618e30..15a9d989db 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,7 @@ option(ENABLE_QT2 "Enable Qt2 (use the other experimental Qt interface)" OFF)
 option(ENABLE_PCH "Use PCH to speed up compilation" ON)
 option(ENABLE_LTO "Enables Link Time Optimization" OFF)
 option(ENABLE_GENERIC "Enables generic build that should run on any little-endian host" OFF)
+option(ENABLE_HEADLESS "Enables running Dolphin as a headless variant" OFF)
 
 # Enable SDL for default on operating systems that aren't OSX, Android, Linux or Windows.
 if(NOT APPLE AND NOT ANDROID AND NOT ${CMAKE_SYSTEM_NAME} STREQUAL "Linux" AND NOT MSVC)
@@ -380,6 +381,15 @@ if(ANDROID)
 	set(USE_EGL 1)
 endif()
 
+if(ENABLE_HEADLESS)
+	message("Enabling Headless! Disabling GUI, force enabling EGL!")
+	set(USE_X11 0)
+	set(USE_EGL 1)
+	set(DISABLE_WX 1)
+	set(ENABLE_QT2 0)
+	add_definitions(-DUSE_HEADLESS)
+endif()
+
 include_directories(Externals/GL)
 
 add_definitions(-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE)
@@ -457,7 +467,7 @@ if(NOT ANDROID)
 
 	set(USE_X11 0)
 
-	if(UNIX AND NOT APPLE)
+	if(UNIX AND NOT APPLE AND NOT ENABLE_HEADLESS)
 		include(FindX11)
 		if(TRY_X11 AND X11_FOUND)
 			set(USE_X11 1)
diff --git a/Source/Core/Common/GL/GLInterface/EGL.h b/Source/Core/Common/GL/GLInterface/EGL.h
index 570844f954..05f07aea5c 100644
--- a/Source/Core/Common/GL/GLInterface/EGL.h
+++ b/Source/Core/Common/GL/GLInterface/EGL.h
@@ -27,7 +27,7 @@ protected:
 	EGLContext egl_ctx;
 	EGLDisplay egl_dpy;
 
-	virtual EGLDisplay OpenDisplay() { return EGL_NO_DISPLAY; }
+	virtual EGLDisplay OpenDisplay() { return eglGetDisplay(EGL_DEFAULT_DISPLAY); }
 	virtual EGLNativeWindowType InitializePlatform(EGLNativeWindowType host_window, EGLConfig config) { return (EGLNativeWindowType)EGL_DEFAULT_DISPLAY; }
 	virtual void ShutdownPlatform() {}
 
diff --git a/Source/Core/Common/GL/GLInterface/GLInterface.cpp b/Source/Core/Common/GL/GLInterface/GLInterface.cpp
index b9a05fd30a..6d4345e5c1 100644
--- a/Source/Core/Common/GL/GLInterface/GLInterface.cpp
+++ b/Source/Core/Common/GL/GLInterface/GLInterface.cpp
@@ -18,6 +18,8 @@
 #else
 #include "Common/GL/GLInterface/GLX.h"
 #endif
+#elif defined(USE_EGL) && USE_EGL && defined(USE_HEADLESS)
+#include "Common/GL/GLInterface/EGL.h"
 #else
 #error Platform doesnt have a GLInterface
 #endif
@@ -30,6 +32,8 @@ std::unique_ptr<cInterfaceBase> HostGL_CreateGLInterface()
 		return std::make_unique<cInterfaceAGL>();
 	#elif defined(_WIN32)
 		return std::make_unique<cInterfaceWGL>();
+	#elif defined(USE_EGL) && defined(USE_HEADLESS)
+		return std::make_unique<cInterfaceEGL>();
 	#elif defined(HAVE_X11) && HAVE_X11
 	#if defined(USE_EGL) && USE_EGL
 		return std::make_unique<cInterfaceEGLX11>();
diff --git a/Source/Core/DolphinWX/CMakeLists.txt b/Source/Core/DolphinWX/CMakeLists.txt
index 6cfd187380..c67834889b 100644
--- a/Source/Core/DolphinWX/CMakeLists.txt
+++ b/Source/Core/DolphinWX/CMakeLists.txt
@@ -194,7 +194,7 @@ if(wxWidgets_FOUND)
 	set(CPACK_PACKAGE_EXECUTABLES ${CPACK_PACKAGE_EXECUTABLES} ${DOLPHIN_EXE})
 endif()
 
-if(USE_X11)
+if(USE_X11 OR ENABLE_HEADLESS)
 	set(DOLPHIN_NOGUI_EXE ${DOLPHIN_EXE_BASE}-nogui)
 	add_executable(${DOLPHIN_NOGUI_EXE} ${SRCS} ${NOGUI_SRCS})
 	target_link_libraries(${DOLPHIN_NOGUI_EXE} ${LIBS})
diff --git a/Source/Core/DolphinWX/MainNoGUI.cpp b/Source/Core/DolphinWX/MainNoGUI.cpp
index 70f099deb7..180af3ffe2 100644
--- a/Source/Core/DolphinWX/MainNoGUI.cpp
+++ b/Source/Core/DolphinWX/MainNoGUI.cpp
@@ -35,11 +35,11 @@ static bool running = true;
 class Platform
 {
 public:
-	virtual void Init() = 0;
-	virtual void SetTitle(const std::string &title) = 0;
-	virtual void MainLoop() = 0;
-	virtual void Shutdown() = 0;
-	virtual ~Platform() {};
+	virtual void Init() {}
+	virtual void SetTitle(const std::string &title) {}
+	virtual void MainLoop() { while(running) {} }
+	virtual void Shutdown() {}
+	virtual ~Platform() {}
 };
 
 static Platform* platform;
@@ -54,7 +54,7 @@ void Host_Message(int Id)
 		running = false;
 }
 
-static void* s_window_handle;
+static void* s_window_handle = nullptr;
 void* Host_GetRenderHandle()
 {
 	return s_window_handle;
@@ -291,7 +291,9 @@ class PlatformX11 : public Platform
 
 static Platform* GetPlatform()
 {
-#if HAVE_X11
+#if defined(USE_EGL) && defined(USE_HEADLESS)
+	return new Platform();
+#elif HAVE_X11
 	return new PlatformX11();
 #endif
 	return nullptr;