From 711285a20e76ca72446aba224972d54df8bbacc0 Mon Sep 17 00:00:00 2001
From: Joshua Ashton <joshua@froggi.es>
Date: Tue, 7 Nov 2023 17:19:33 +0000
Subject: [PATCH] steamcompmgr: Add GAMESCOPE_DISPLAY_REFRESH_RATE_FEEDBACK

---
 src/steamcompmgr.cpp | 12 ++++++++++++
 src/xwayland_ctx.hpp |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/src/steamcompmgr.cpp b/src/steamcompmgr.cpp
index 7d7891c4ec..0d37b336f6 100644
--- a/src/steamcompmgr.cpp
+++ b/src/steamcompmgr.cpp
@@ -294,6 +294,7 @@ bool g_bSupportsST2084_CachedValue = false;
 bool g_bForceHDR10OutputDebug = false;
 bool g_bHDREnabled = false;
 bool g_bHDRItmEnable = false;
+int g_nCurrentRefreshRate_CachedValue = 0;
 
 static void
 update_color_mgmt()
@@ -7082,6 +7083,8 @@ void init_xwayland_ctx(uint32_t serverId, gamescope_xwayland_server_t *xwayland_
 	ctx->atoms.gamescopeReshadeEffect = XInternAtom( ctx->dpy, "GAMESCOPE_RESHADE_EFFECT", false );
 	ctx->atoms.gamescopeReshadeTechniqueIdx = XInternAtom( ctx->dpy, "GAMESCOPE_RESHADE_TECHNIQUE_IDX", false );
 
+	ctx->atoms.gamescopeDisplayRefreshRateFeedback = XInternAtom( ctx->dpy, "GAMESCOPE_DISPLAY_REFRESH_RATE_FEEDBACK", false );
+
 	ctx->atoms.wineHwndStyle = XInternAtom( ctx->dpy, "_WINE_HWND_STYLE", false );
 	ctx->atoms.wineHwndStyleEx = XInternAtom( ctx->dpy, "_WINE_HWND_EXSTYLE", false );
 
@@ -7191,6 +7194,15 @@ void update_vrr_atoms(xwayland_ctx_t *root_ctx, bool force, bool* needs_flush =
 			*needs_flush = true;
 	}
 
+	if ( g_nOutputRefresh != g_nCurrentRefreshRate_CachedValue || force )
+	{
+		XChangeProperty(root_ctx->dpy, root_ctx->root, root_ctx->atoms.gamescopeDisplayRefreshRateFeedback, XA_CARDINAL, 32, PropModeReplace,
+			(unsigned char *)&g_nOutputRefresh, 1 );
+		g_nCurrentRefreshRate_CachedValue = g_nOutputRefresh;
+		if (needs_flush)
+			*needs_flush = true;
+	}
+
 	// Don't update this in-sync with DRM vrr usage.
 	// Keep this as a preference, starting with off.
 	if ( force )
diff --git a/src/xwayland_ctx.hpp b/src/xwayland_ctx.hpp
index cd6c35d737..a687bdb0d6 100644
--- a/src/xwayland_ctx.hpp
+++ b/src/xwayland_ctx.hpp
@@ -218,6 +218,8 @@ struct xwayland_ctx_t
 		Atom gamescopeReshadeEffect;
 		Atom gamescopeReshadeTechniqueIdx;
 
+		Atom gamescopeDisplayRefreshRateFeedback;
+
 		Atom wineHwndStyle;
 		Atom wineHwndStyleEx;