waiting.....

crates/renderer/src/render_graph.rs

@@ -584,8 +584,10 @@ impl RenderGraph {
             }
         }
 
+        let pass_count = self.pass_descs.len() as u32;
+
         // build graph from references.
-        {
+        let mut dag = {
             let mut edges = Vec::new();
 
             intervals.iter().for_each(|(&rid, &(from, to))| {
@@ -618,12 +620,9 @@ impl RenderGraph {
 
                 // pass, read, write
                 let mut current_pass = (from, Access::empty(), Access::empty());
-                let max_i = self.pass_descs.len() as u32;
-                eprintln!("{rid:?}:");
-                for pass in
-                    PassNode::range_full(from, to, max_i).map(|i| PassNode::from_u32(i, max_i))
+                for pass in PassNode::range_full(from, to, pass_count)
+                    .map(|i| PassNode::from_u32(i, pass_count))
                 {
-                    eprintln!("{pass:?}:");
                     let mut range = references.range(
                         GraphRef {
                             pass,
@@ -637,9 +636,6 @@ impl RenderGraph {
                     );
 
                     while let Some(a) = range.next() {
-                        eprintln!("{a:?}");
-                        eprintln!("made_visible: {made_visible:?}");
-                        eprintln!("to_make_available: {to_make_available:?}");
                         if a.pass != current_pass.0 {
                             if current_pass.1 != Access::empty() {
                                 last_read = Some(PreviousRef::Read(current_pass.0, current_pass.1));
@@ -841,11 +837,11 @@ impl RenderGraph {
             });
 
             let mut dag = petgraph::graph::DiGraph::new();
-            dag.add_node(PassNode::First);
+            let root = dag.add_node(PassNode::First);
+            let output = dag.add_node(PassNode::Last);
             for i in 0..self.pass_descs.len() {
                 dag.add_node(PassNode::Pass(i));
             }
-            dag.add_node(PassNode::Last);
 
             for ((from, to), weight) in edges {
                 dag.add_edge(
@@ -855,6 +851,19 @@ impl RenderGraph {
                 );
             }
 
+            loop {
+                let sinks = dag
+                    .externals(petgraph::Direction::Outgoing)
+                    .filter(|idx| dag.node_weight(*idx) != Some(&PassNode::Last))
+                    .collect::<Vec<_>>();
+                if sinks.is_empty() {
+                    break;
+                }
+                for sink in sinks {
+                    dag.remove_node(sink);
+                }
+            }
+
             #[cfg(any(debug_assertions, test))]
             std::fs::write(
                 "render_graph2.dot",
@@ -875,7 +884,9 @@ impl RenderGraph {
                 ),
             )
             .expect("writing render_graph repr");
-        }
+
+            dag
+        };
 
         let now = std::time::Instant::now();
         let mut dag = petgraph::stable_graph::StableDiGraph::new();