GL/Context: Load wayland-egl dynamically

Gets rid of the dependency on libwayland-egl, allowing us to always use
the system version.

Solves missing symbol issues by including it in the AppImage.

cmake/SearchForStuff.cmake

@@ -126,9 +126,6 @@ else()
 			check_lib(XCB xcb xcb/xcb.h)
 			check_lib(XRANDR xrandr)
 		endif()
-		if(WAYLAND_API)
-			find_package(Wayland REQUIRED)
-		endif()
 
 		if(Linux)
 			check_lib(AIO aio libaio.h)
@@ -169,9 +166,9 @@ else()
 		## Use pcsx2 package to find module
 		find_package(HarfBuzz)
 		endif()
-	endif()
-	if(WAYLAND_API)
-		find_package(Wayland REQUIRED)
+		if(WAYLAND_API)
+			find_package(Wayland REQUIRED)
+		endif()
 	endif()
 endif(WIN32)
 

common/CMakeLists.txt

@@ -243,7 +243,6 @@ if(USE_OPENGL)
 				GL/ContextEGLWayland.cpp
 				GL/ContextEGLWayland.h
 			)
-			target_link_libraries(common PRIVATE ${WAYLAND_EGL_LIBRARIES})
 		endif()
 	endif()
 endif()

common/GL/ContextEGLWayland.cpp

@@ -14,27 +14,34 @@
  */
 
 #include "common/PrecompiledHeader.h"
+#include "common/Console.h"
 
 #include "ContextEGLWayland.h"
-#include <wayland-egl.h>
+
+#include <dlfcn.h>
 
 namespace GL
 {
+	static const char* WAYLAND_EGL_MODNAME = "libwayland-egl.so.1";
+
 	ContextEGLWayland::ContextEGLWayland(const WindowInfo& wi)
 		: ContextEGL(wi)
 	{
 	}
+
 	ContextEGLWayland::~ContextEGLWayland()
 	{
 		if (m_wl_window)
-			wl_egl_window_destroy(m_wl_window);
+			m_wl_egl_window_destroy(m_wl_window);
+		if (m_wl_module)
+			dlclose(m_wl_module);
 	}
 
 	std::unique_ptr<Context> ContextEGLWayland::Create(const WindowInfo& wi, const Version* versions_to_try,
 		size_t num_versions_to_try)
 	{
 		std::unique_ptr<ContextEGLWayland> context = std::make_unique<ContextEGLWayland>(wi);
-		if (!context->Initialize(versions_to_try, num_versions_to_try))
+		if (!context->LoadModule() || !context->Initialize(versions_to_try, num_versions_to_try))
 			return nullptr;
 
 		return context;
@@ -45,7 +52,7 @@ namespace GL
 		std::unique_ptr<ContextEGLWayland> context = std::make_unique<ContextEGLWayland>(wi);
 		context->m_display = m_display;
 
-		if (!context->CreateContextAndSurface(m_version, m_context, false))
+		if (!context->LoadModule() || !context->CreateContextAndSurface(m_version, m_context, false))
 			return nullptr;
 
 		return context;
@@ -54,7 +61,7 @@ namespace GL
 	void ContextEGLWayland::ResizeSurface(u32 new_surface_width, u32 new_surface_height)
 	{
 		if (m_wl_window)
-			wl_egl_window_resize(m_wl_window, new_surface_width, new_surface_height, 0, 0);
+			m_wl_egl_window_resize(m_wl_window, new_surface_width, new_surface_height, 0, 0);
 
 		ContextEGL::ResizeSurface(new_surface_width, new_surface_height);
 	}
@@ -63,15 +70,36 @@ namespace GL
 	{
 		if (m_wl_window)
 		{
-			wl_egl_window_destroy(m_wl_window);
+			m_wl_egl_window_destroy(m_wl_window);
 			m_wl_window = nullptr;
 		}
 
 		m_wl_window =
-			wl_egl_window_create(static_cast<wl_surface*>(m_wi.window_handle), m_wi.surface_width, m_wi.surface_height);
+			m_wl_egl_window_create(static_cast<wl_surface*>(m_wi.window_handle), m_wi.surface_width, m_wi.surface_height);
 		if (!m_wl_window)
 			return {};
 
 		return reinterpret_cast<EGLNativeWindowType>(m_wl_window);
 	}
+
+	bool ContextEGLWayland::LoadModule()
+	{
+		m_wl_module = dlopen(WAYLAND_EGL_MODNAME, RTLD_NOW | RTLD_GLOBAL);
+		if (!m_wl_module)
+		{
+			Console.Error("Failed to load %s.", WAYLAND_EGL_MODNAME);
+			return false;
+		}
+
+		m_wl_egl_window_create = reinterpret_cast<decltype(m_wl_egl_window_create)>(dlsym(m_wl_module, "wl_egl_window_create"));
+		m_wl_egl_window_destroy = reinterpret_cast<decltype(m_wl_egl_window_destroy)>(dlsym(m_wl_module, "wl_egl_window_destroy"));
+		m_wl_egl_window_resize = reinterpret_cast<decltype(m_wl_egl_window_resize)>(dlsym(m_wl_module, "wl_egl_window_resize"));
+		if (!m_wl_egl_window_create || !m_wl_egl_window_destroy || !m_wl_egl_window_resize)
+		{
+			Console.Error("Failed to load one or more functions from %s.", WAYLAND_EGL_MODNAME);
+			return false;
+		}
+
+		return true;
+	}
 } // namespace GL

common/GL/ContextEGLWayland.h

@@ -17,7 +17,8 @@
 
 #include "common/GL/ContextEGL.h"
 
-#include <wayland-egl.h>
+struct wl_egl_window;
+struct wl_surface;
 
 namespace GL
 {
@@ -37,7 +38,13 @@ namespace GL
 		EGLNativeWindowType GetNativeWindow(EGLConfig config) override;
 
 	private:
-		wl_egl_window* m_wl_window = nullptr;
-	};
+		bool LoadModule();
 
+		wl_egl_window* m_wl_window = nullptr;
+
+		void* m_wl_module = nullptr;
+		wl_egl_window* (*m_wl_egl_window_create)(struct wl_surface* surface, int width, int height);
+		void (*m_wl_egl_window_destroy)(struct wl_egl_window* egl_window);
+		void (*m_wl_egl_window_resize)(struct wl_egl_window* egl_window, int width, int height, int dx, int dy);
+	};
 } // namespace GL