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.

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);