optional pass record function for pure layout/transition passes

crates/renderer/src/egui.rs

@@ -380,7 +380,7 @@ pub fn egui_pre_pass(
                 )
             })
             .collect(),
-        record,
+        record: Some(record),
     });
     Ok(())
 }
@@ -730,7 +730,7 @@ pub fn egui_pass(
     rg.add_pass(PassDesc {
         reads,
         writes,
-        record,
+        record: Some(record),
     });
 
     Ok(to_remove_tex_ids)

crates/renderer/src/render_graph.rs

@@ -313,7 +313,7 @@ pub struct PassDesc {
     // this pass performs `Access` write on `GraphResourceId`.
     // some `GraphResourceId` may occur multiple times.
     pub writes: Vec<(GraphResourceId, Access)>,
-    pub record: Box<RecordFn>,
+    pub record: Option<Box<RecordFn>>,
 }
 
 impl Default for PassDesc {
@@ -321,7 +321,7 @@ impl Default for PassDesc {
         Self {
             reads: Default::default(),
             writes: Default::default(),
-            record: Box::new(|_| Ok(())),
+            record: None,
         }
     }
 }
@@ -461,13 +461,12 @@ impl RenderGraph {
             }
         }
 
-        let now = std::time::Instant::now();
         let pool =
             commands::SingleUseCommandPool::new(device.clone(), device.graphics_queue().clone())?;
 
         let resources = &self.resources;
         let cmds = topo
-            .into_iter()
+            .iter()
             .rev()
             .map(|(passes, accesses)| {
                 let passes = passes
@@ -497,7 +496,9 @@ impl RenderGraph {
                     };
 
                     for pass in passes {
-                        (pass.record)(&ctx)?;
+                        if let Some(record) = pass.record {
+                            (record)(&ctx)?;
+                        }
                     }
 
                     ctx.cmd.end()?;
@@ -508,11 +509,6 @@ impl RenderGraph {
 
         let cmd_list = commands::CommandList(cmds);
 
-        tracing::debug!(
-            "recording render graph: {}ms",
-            now.elapsed().as_micros() as f32 / 1e3
-        );
-
         Ok(WithLifetime::new(cmd_list))
     }
 
@@ -1306,17 +1302,16 @@ pub fn clear_pass(rg: &mut RenderGraph, color: Rgba, target: GraphResourceId) {
     rg.add_pass(PassDesc {
         reads,
         writes,
-        record,
+        record: Some(record),
     });
 }
 
 pub fn present_pass(rg: &mut RenderGraph, target: GraphResourceId) {
-    let record: Box<RecordFn> = Box::new(|_| Ok(()));
     let reads = vec![(target, Access::present())];
     let writes = vec![(target, Access::present())];
     rg.add_pass(PassDesc {
         reads,
         writes,
-        record,
+        record: None,
     });
 }