native: Add abstract MetaOutputNative object

MetaOutputKms is made to inherit from this, but it doesn't do anything
special yet.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1698>

src/backends/native/meta-output-kms.c

@@ -41,12 +41,12 @@
 
 struct _MetaOutputKms
 {
-  MetaOutput parent;
+  MetaOutputNative parent;
 
   MetaKmsConnector *kms_connector;
 };
 
-G_DEFINE_TYPE (MetaOutputKms, meta_output_kms, META_TYPE_OUTPUT)
+G_DEFINE_TYPE (MetaOutputKms, meta_output_kms, META_TYPE_OUTPUT_NATIVE)
 
 MetaKmsConnector *
 meta_output_kms_get_kms_connector (MetaOutputKms *output_kms)

src/backends/native/meta-output-kms.h

@@ -26,11 +26,12 @@
 #include "backends/meta-output.h"
 #include "backends/native/meta-gpu-kms.h"
 #include "backends/native/meta-kms-types.h"
+#include "backends/native/meta-output-native.h"
 
 #define META_TYPE_OUTPUT_KMS (meta_output_kms_get_type ())
 G_DECLARE_FINAL_TYPE (MetaOutputKms, meta_output_kms,
                       META, OUTPUT_KMS,
-                      MetaOutput)
+                      MetaOutputNative)
 
 void meta_output_kms_set_power_save_mode (MetaOutputKms *output_kms,
                                           uint64_t       dpms_state,

src/backends/native/meta-output-native.c

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2020 Red Hat
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include "backends/native/meta-output-native.h"
+
+G_DEFINE_ABSTRACT_TYPE (MetaOutputNative, meta_output_native,
+                        META_TYPE_OUTPUT)
+
+static void
+meta_output_native_init (MetaOutputNative *output_native)
+{
+}
+
+static void
+meta_output_native_class_init (MetaOutputNativeClass *klass)
+{
+}

src/backends/native/meta-output-native.h

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2020 Red Hat
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef META_OUTPUT_NATIVE_H
+#define META_OUTPUT_NATIVE_H
+
+#include "backends/meta-output.h"
+
+#define META_TYPE_OUTPUT_NATIVE (meta_output_native_get_type ())
+G_DECLARE_DERIVABLE_TYPE (MetaOutputNative, meta_output_native,
+                          META, OUTPUT_NATIVE,
+                          MetaOutput)
+
+struct _MetaOutputNativeClass
+{
+  MetaOutputClass parent_class;
+};
+
+#endif /* META_OUTPUT_NATIVE_H */

src/meson.build

@@ -674,6 +674,8 @@ if have_native_backend
     'backends/native/meta-monitor-manager-native.h',
     'backends/native/meta-output-kms.c',
     'backends/native/meta-output-kms.h',
+    'backends/native/meta-output-native.c',
+    'backends/native/meta-output-native.h',
     'backends/native/meta-kms-connector-private.h',
     'backends/native/meta-kms-connector.c',
     'backends/native/meta-kms-connector.h',