Add vrr_supported/enabled to output IPC

niri-ipc/src/lib.rs

@@ -252,6 +252,10 @@ pub struct Output {
     ///
     /// `None` if the output is disabled.
     pub current_mode: Option<usize>,
+    /// Whether the output supports variable refresh rate.
+    pub vrr_supported: bool,
+    /// Whether variable refresh rate is enabled on the output.
+    pub vrr_enabled: bool,
     /// Logical output information.
     ///
     /// `None` if the output is not mapped to any logical output (for example, if it is disabled).

src/backend/tty.rs

@@ -1451,6 +1451,9 @@ impl Tty {
                     }
                 }
 
+                let vrr_supported = is_vrr_capable(&device.drm, connector.handle()) == Some(true);
+                let vrr_enabled = surface.map_or(false, |surface| surface.vrr_enabled);
+
                 let logical = niri
                     .global_space
                     .outputs()
@@ -1467,6 +1470,8 @@ impl Tty {
                     physical_size,
                     modes,
                     current_mode,
+                    vrr_supported,
+                    vrr_enabled,
                     logical,
                 };
 

src/backend/winit.rs

@@ -73,6 +73,8 @@ impl Winit {
                     is_preferred: true,
                 }],
                 current_mode: Some(0),
+                vrr_supported: false,
+                vrr_enabled: false,
                 logical: Some(logical_output(&output)),
             },
         )])));

src/ipc/client.rs

@@ -72,6 +72,8 @@ pub fn handle_msg(msg: Msg, json: bool) -> anyhow::Result<()> {
                     physical_size,
                     modes,
                     current_mode,
+                    vrr_supported,
+                    vrr_enabled,
                     logical,
                 } = output;
 
@@ -94,6 +96,13 @@ pub fn handle_msg(msg: Msg, json: bool) -> anyhow::Result<()> {
                     println!("  Disabled");
                 }
 
+                if vrr_supported {
+                    let enabled = if vrr_enabled { "enabled" } else { "disabled" };
+                    println!("  Variable refresh rate: supported, {enabled}");
+                } else {
+                    println!("  Variable refresh rate: not supported");
+                }
+
                 if let Some((width, height)) = physical_size {
                     println!("  Physical size: {width}x{height} mm");
                 } else {