wlserver: Add gamescope-control protocol

protocol/gamescope-control.xml

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="gamescope_control">
+
+  <copyright>
+    Copyright © 2023 Valve Corporation
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice (including the next
+    paragraph) shall be included in all copies or substantial portions of the
+    Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+  </copyright>
+
+  <description summary="gamescope-specific protocol">
+    This is a private Gamescope protocol. Regular Wayland clients must not use
+    it.
+  </description>
+
+  <interface name="gamescope_control" version="1">
+    <request name="destroy" type="destructor"></request>
+
+    <enum name="feature">
+      <description summary="gamescope feature types">
+        Enum of the features supported by Gamescope.
+      </description>
+      <entry name="done" value="0" summary="sent at the end of the feature list"/>
+      <entry name="reshade_shaders" value="1"/>
+    </enum>
+
+    <event name="feature_support">
+        <description summary="feature supported">
+          Says whether a feature is supported and the version.
+        </description>
+        <arg name="feature" type="uint" summary="one of the enum features"/>
+        <arg name="version" type="uint" summary="feature version"/>
+        <arg name="flags" type="uint" summary="feature flags (none currently)"/>
+      </event>
+  </interface>
+</protocol>

protocol/meson.build

@@ -7,6 +7,7 @@ protocols = [
 	'gamescope-pipewire',
 	'gamescope-input-method',
 	'gamescope-tearing-control-unstable-v1',
+	'gamescope-control',
 	'xdg-shell',
 	'presentation-time',
 ]

src/wlserver.cpp

@@ -38,6 +38,7 @@ extern "C" {
 
 #include "gamescope-xwayland-protocol.h"
 #include "gamescope-pipewire-protocol.h"
+#include "gamescope-control-protocol.h"
 #include "gamescope-tearing-control-unstable-v1-protocol.h"
 #include "presentation-time-protocol.h"
 
@@ -734,7 +735,34 @@ static void create_gamescope_pipewire( void )
 }
 #endif
 
+//
 
+static void gamescope_control_handle_destroy( struct wl_client *client, struct wl_resource *resource )
+{
+	wl_resource_destroy( resource );
+}
+
+static const struct gamescope_control_interface gamescope_control_impl = {
+	.destroy = gamescope_control_handle_destroy,
+};
+
+static void gamescope_control_bind( struct wl_client *client, void *data, uint32_t version, uint32_t id )
+{
+	struct wl_resource *resource = wl_resource_create( client, &gamescope_control_interface, version, id );
+	wl_resource_set_implementation( resource, &gamescope_control_impl, NULL, NULL );
+
+	// Send feature support
+	gamescope_control_send_feature_support( resource, GAMESCOPE_CONTROL_FEATURE_RESHADE_SHADERS, 1, 0 );
+	gamescope_control_send_feature_support( resource, GAMESCOPE_CONTROL_FEATURE_DONE, 0, 0 );
+}
+
+static void create_gamescope_control( void )
+{
+	uint32_t version = 1;
+	wl_global_create( wlserver.display, &gamescope_control_interface, version, NULL, gamescope_control_bind );
+}
+
+//
 
 static void gamescope_surface_tearing_set_presentation_hint( struct wl_client *client, struct wl_resource *resource, uint32_t hint )
 {
@@ -1243,6 +1271,8 @@ bool wlserver_init( void ) {
 	create_gamescope_pipewire();
 #endif
 
+	create_gamescope_control();
+
 	create_gamescope_tearing();
 
 	create_presentation_time();