core: indirect draw passes, device feature list, drop handles-specific bundle heuristics

Amp-Thread-ID: https://ampcode.com/threads/T-01a0b2dd-db32-712d-99ce-12ce4a86d979
Co-authored-by: Heaust Azure <heaust.azure@gmail.com>

core/render_graph/render_graph.rs

@@ -192,10 +192,23 @@ pub struct Pass {
     pub index_buffer: Option<IndexBinding>,
     #[serde(default)]
     pub draw: Draw,
+    pub indirect: Option<IndirectBinding>,
     #[serde(default = "dispatch")]
     pub dispatch: [u32; 3],
 }
 
+/// Draw commands read from rows of an `indirect` buffer: one command per row starting at
+/// `first`, `count` rows (default: every row to the end of the array). The command occupies the
+/// first 16 bytes (non-indexed) or 20 bytes (indexed) of each row; the remainder of the row is
+/// free for the caller.
+#[derive(Clone, Deserialize, PartialEq, Eq)]
+pub struct IndirectBinding {
+    pub resource: String,
+    #[serde(default)]
+    pub first: u32,
+    pub count: Option<u32>,
+}
+
 #[derive(Clone, Deserialize, PartialEq, Eq)]
 pub struct Binding {
     #[serde(default)]
@@ -344,6 +357,17 @@ impl RenderGraph {
                 "compute" => _ = compute_pipelines.insert(pass.pipeline.clone()),
                 _ => return Err("GRAPH_PASS"),
             }
+            if let Some(indirect) = &pass.indirect {
+                let usable = self
+                    .resources
+                    .buffers
+                    .iter()
+                    .find(|buffer| buffer.id == indirect.resource)
+                    .is_some_and(|buffer| buffer.usage.iter().any(|usage| usage == "indirect"));
+                if !usable || pass.draw != Draw::default() {
+                    return Err("GRAPH_INDIRECT");
+                }
+            }
             for id in pass.resources() {
                 used.insert(id.to_owned());
                 lifetimes
@@ -532,6 +556,7 @@ impl Pass {
                     .iter()
                     .map(|value| value.resource.as_str()),
             )
+            .chain(self.indirect.iter().map(|value| value.resource.as_str()))
             .collect()
     }
 }