render: remove IDs for everything, use only labels to identify things

A node wont always render or compute, so it wouldn't actually be a pass. Calling it a node is a better representation of what it actually is

Cargo.lock

@@ -384,6 +384,12 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
+[[package]]
+name = "bind_match"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "171f0236f66c7be99f32060539c2bade94033ded356ecf4c9dc9b1e6198326cd"
+
 [[package]]
 name = "bit-set"
 version = "0.5.3"
@@ -1859,6 +1865,7 @@ dependencies = [
  "anyhow",
  "async-std",
  "async-trait",
+ "bind_match",
  "bytemuck",
  "cfg-if",
  "gilrs-core",

lyra-game/Cargo.toml

@@ -37,6 +37,7 @@ thiserror = "1.0.56"
 unique = "0.9.1"
 rustc-hash = "1.1.0"
 petgraph = { version = "0.6.5", features = ["matrix_graph"] }
+bind_match = "0.1.2"
 
 [features]
 tracy = ["dep:tracing-tracy"]

lyra-game/src/render/graph/mod.rs

@@ -1,11 +1,10 @@
-mod pass;
+mod node;
 use std::{
-    cell::RefCell, collections::{HashMap, VecDeque}, fmt::Debug, hash::Hash, rc::Rc, sync::Arc
+    cell::{Ref, RefCell}, collections::{HashMap, VecDeque}, fmt::Debug, hash::Hash, rc::Rc, sync::Arc
 };
 
-use itertools::Itertools;
 use lyra_ecs::World;
-pub use pass::*;
+pub use node::*;
 
 mod passes;
 pub use passes::*;
@@ -34,6 +33,8 @@ pub trait RenderGraphLabel: Debug + 'static {
     }
 }
 
+pub struct RenderGraphHash(u64);
+
 #[derive(Clone)]
 pub struct RenderGraphLabelValue(Rc<dyn RenderGraphLabel>);
 
@@ -76,10 +77,11 @@ impl PartialEq for RenderGraphLabelValue {
 impl Eq for RenderGraphLabelValue {}
 
 struct PassEntry {
-    inner: Arc<RefCell<dyn RenderGraphPass>>,
-    desc: Arc<RenderGraphPassDesc>,
+    inner: Arc<RefCell<dyn Node>>,
+    desc: Rc<RefCell<NodeDesc>>,
     /// The index of the pass in the execution graph
     graph_index: petgraph::matrix_graph::NodeIndex<usize>,
+    pipeline: Rc<RefCell<Option<PipelineResource>>>,
 }
 
 pub struct BindGroupEntry {
@@ -116,20 +118,19 @@ pub struct RenderTarget {
 pub struct RenderGraph {
     device: Rc<wgpu::Device>,
     queue: Rc<wgpu::Queue>,
-    slots: FxHashMap<u64, ResourcedSlot>,
+    slots: FxHashMap<RenderGraphLabelValue, ResourcedSlot>,
     /// HashMap used to lookup the slot id using the label's hash
-    slot_label_lookup: FxHashMap<RenderGraphLabelValue, u64>,
-    passes: FxHashMap<u64, PassEntry>,
+    //slot_label_lookup: FxHashMap<RenderGraphLabelValue, u64>,
+    passes: FxHashMap<RenderGraphLabelValue, PassEntry>,
     // TODO: Use a SlotMap
-    bind_groups: FxHashMap<u64, BindGroupEntry>,
+    bind_groups: FxHashMap<RenderGraphLabelValue, BindGroupEntry>,
     /// HashMap used to lookup the bind group id using the label's hash
-    bind_group_names: FxHashMap<RenderGraphLabelValue, u64>,
+    //bind_group_names: FxHashMap<RenderGraphLabelValue, u64>,
     // TODO: make pipelines a `type` parameter in RenderPasses,
     // then the pipelines can be retrieved via TypeId to the pass.
-    pipelines: FxHashMap<u64, PipelineResource>,
-    current_id: u64,
+    //pipelines: FxHashMap<u64, PipelineResource>,
     /// A directed graph describing the execution path of the RenderGraph
-    execution_graph: petgraph::matrix_graph::DiMatrix<u64, (), Option<()>, usize>,
+    execution_graph: petgraph::matrix_graph::DiMatrix<RenderGraphLabelValue, (), Option<()>, usize>,
 }
 
 impl RenderGraph {
@@ -138,12 +139,8 @@ impl RenderGraph {
             device,
             queue,
             slots: Default::default(),
-            slot_label_lookup: Default::default(),
             passes: Default::default(),
             bind_groups: Default::default(),
-            bind_group_names: Default::default(),
-            pipelines: Default::default(),
-            current_id: 1,
             execution_graph: Default::default(),
         }
     }
@@ -152,48 +149,46 @@ impl RenderGraph {
         &*self.device
     }
 
-    pub fn next_id(&mut self) -> u64 {
-        self.current_id += 1;
-        self.current_id
-    }
-
-    pub(crate) fn slot_id_rc(&self, label: &RenderGraphLabelValue) -> Option<u64> {
-        self.slot_label_lookup.get(&label.clone().into()).cloned()
-    }
-
-    pub fn slot_id(&self, label: &dyn RenderGraphLabel) -> Option<u64> {
-        self.slot_label_lookup.get(&label.rc_clone().into()).cloned()
-    }
-
+    /// Add a [`Node`] to the RenderGraph.
+    /// 
+    /// When the node is added, its [`Node::desc`] method will be executed.
+    /// 
+    /// Additionally, all [`Slot`](node::NodeSlot)s of the node will be iterated,
+    /// 1. Ensuring that there are no two slots of the same name, with different value types
+    /// 2. Changing the id of insert slots to match the id of the output slot of the same name.
+    ///     * This means that the id of insert slots **ARE NOT STABLE**. **DO NOT** rely on them to
+    ///     not change. The IDs of output slots do stay the same.
+    /// 3. Ensuring that no two slots share the same ID when the names do not match.
     #[instrument(skip(self, pass), level = "debug")]
-    pub fn add_pass<P: RenderGraphPass>(&mut self, mut pass: P) {
+    pub fn add_pass<P: Node>(&mut self, label: impl RenderGraphLabel, mut pass: P) {
         let mut desc = pass.desc(self);
 
         // collect all the slots of the pass
         for slot in &mut desc.slots {
-            if let Some((id, other)) = self
-                .slot_label_lookup
-                .get(&slot.label)
-                .and_then(|id| self.slots.get_mut(id).map(|s| (id, s)))
+            if let Some(other) = self
+                .slots
+                .get_mut(&slot.label)
+                //.map(|s| (id, s))
+                //.and_then(|id| self.slots.get_mut(id).map(|s| (id, s)))
             {
                 debug_assert_eq!(
                     slot.ty, other.ty,
                     "slot {:?} in pass {:?} does not match existing slot of same name",
-                    slot.label, desc.label
+                    slot.label, label
                 );
 
-                trace!(
+                /* trace!(
                     "Found existing slot for {:?}, changing id to {}",
                     slot.label,
                     id
-                );
+                ); */
 
                 // if there is a slot of the same name
-                slot.id = *id;
+                //slot.id = *id;
             } else {
-                debug_assert!(!self.slots.contains_key(&slot.id),
+                debug_assert!(!self.slots.contains_key(&slot.label),
                     "Reuse of id detected in render graph! Pass: {:?}, slot: {:?}",
-                    desc.label, slot.label,
+                    label, slot.label,
                 );
 
                 let res_slot = ResourcedSlot {
@@ -202,66 +197,69 @@ impl RenderGraph {
                     value: slot.value.clone().unwrap_or(SlotValue::None),
                 };
 
-                self.slots.insert(slot.id, res_slot);
-                self.slot_label_lookup.insert(slot.label.clone(), slot.id);
+                self.slots.insert(slot.label.clone(), res_slot);
             }
         }
 
         // get clones of the bind groups and layouts
         for (label, bg, bgl) in &desc.bind_groups {
-            let bg_id = self.next_id();
-            self.bind_groups.insert(
-                bg_id,
-                BindGroupEntry {
-                    label: label.clone(),
-                    bg: bg.clone(),
-                    layout: bgl.clone(),
-                },
-            );
-            self.bind_group_names.insert(label.clone().into(), bg_id);
+            self.bind_groups.insert(label.clone(), BindGroupEntry {
+                label: label.clone(),
+                bg: bg.clone(),
+                layout: bgl.clone(),
+            });
         }
 
-        let index = self.execution_graph.add_node(desc.id);
+        let label: RenderGraphLabelValue = label.into();
+        let index = self.execution_graph.add_node(label.clone());
 
         self.passes.insert(
-            desc.id,
+            label,
             PassEntry {
                 inner: Arc::new(RefCell::new(pass)),
-                desc: Arc::new(desc),
+                desc: Rc::new(RefCell::new(desc)),
                 graph_index: index,
+                pipeline: Rc::new(RefCell::new(None)),
             },
         );
     }
 
     /// Creates all buffers required for the passes, also creates an internal execution path.
+    /// 
+    /// This only needs to be ran when the [`Node`]s in the graph change, or they are removed or
+    /// added.
     #[instrument(skip(self, device))]
     pub fn setup(&mut self, device: &wgpu::Device) {
         // For all passes, create their pipelines
-        for pass in self.passes.values() {
-            if let Some(pipeline_desc) = &pass.desc.pipeline_desc {
-                let pipeline = match pass.desc.pass_type {
-                    RenderPassType::Render => Pipeline::Render(RenderPipeline::create(
+        for pass in self.passes.values_mut() {
+            let desc = (*pass.desc).borrow();
+            if let Some(pipeline_desc) = &desc.pipeline_desc {
+                let pipeline = match desc.ty {
+                    NodeType::Render => Pipeline::Render(RenderPipeline::create(
                         device,
                         pipeline_desc
                             .as_render_pipeline_descriptor()
                             .expect("got compute pipeline descriptor in a render pass"),
                     )),
-                    RenderPassType::Compute => Pipeline::Compute(ComputePipeline::create(
+                    NodeType::Compute => Pipeline::Compute(ComputePipeline::create(
                         device,
                         pipeline_desc
                             .as_compute_pipeline_descriptor()
                             .expect("got render pipeline descriptor in a compute pass"),
                     )),
-                    RenderPassType::Presenter | RenderPassType::Node => {
+                    NodeType::Presenter | NodeType::Node => {
                         panic!("Present or Node RenderGraph passes should not have a pipeline descriptor!");
                     }
                 };
 
+                drop(desc);
                 let res = PipelineResource {
                     pipeline,
                     bg_layout_name_lookup: Default::default(),
                 };
-                self.pipelines.insert(pass.desc.id, res);
+
+                let mut pipeline = pass.pipeline.borrow_mut();
+                *pipeline = Some(res);
             }
         }
     }
@@ -269,10 +267,16 @@ impl RenderGraph {
     #[instrument(skip(self, world))]
     pub fn prepare(&mut self, world: &mut World) {
         // prepare all passes
-        let mut context = RenderGraphContext::new(&self.device, &self.queue, None);
-        for (_, pass) in &mut self.passes {
+        let mut buffer_writes = VecDeque::<GraphBufferWrite>::new();
+        // reserve some buffer writes. not all nodes write so half the amount of them is probably
+        // fine.
+        buffer_writes.reserve(self.passes.len() / 2);
+
+        for (label, pass) in &mut self.passes {
+            let mut context = RenderGraphContext::new(&self.device, &self.queue, None, label.clone());
             let mut inner = pass.inner.borrow_mut();
             inner.prepare(world, &mut context);
+            buffer_writes.append(&mut context.buffer_writes);
         }
 
         {
@@ -280,10 +284,10 @@ impl RenderGraph {
             let s = debug_span!("queue_buffer_writes");
             let _e = s.enter();
 
-            while let Some(bufwr) = context.buffer_writes.pop_front() {
+            while let Some(bufwr) = buffer_writes.pop_front() {
                 let slot = self
                     .slots
-                    .get(&self.slot_id_rc(&bufwr.target_slot).unwrap())
+                    .get(&bufwr.target_slot)
                     .expect(&format!(
                         "Failed to find slot '{:?}' for buffer write",
                         bufwr.target_slot
@@ -300,26 +304,25 @@ impl RenderGraph {
 
     #[instrument(skip(self))]
     pub fn render(&mut self) {
-        let mut sorted: VecDeque<u64> = petgraph::algo::toposort(&self.execution_graph, None)
+        let mut sorted: VecDeque<RenderGraphLabelValue> = petgraph::algo::toposort(&self.execution_graph, None)
             .expect("RenderGraph had cycled!")
             .iter()
-            .map(|i| self.execution_graph[i.clone()])
+            .map(|i| self.execution_graph[i.clone()].clone())
             .collect();
-        let path_names = sorted
-            .iter()
-            .map(|i| self.pass(*i).unwrap().label.clone())
-            .collect_vec();
-        trace!("Render graph execution order: {:?}", path_names);
+        //debug!("Render graph execution order: {:?}", sorted);
 
         let mut encoders = Vec::with_capacity(self.passes.len() / 2);
-        while let Some(pass_id) = sorted.pop_front() {
-            let pass = self.passes.get(&pass_id).unwrap();
+        while let Some(pass_label) = sorted.pop_front() {
+            let pass = self.passes.get(&pass_label).unwrap();
             let pass_inn = pass.inner.clone();
+            
             let pass_desc = pass.desc.clone();
-            let label = format!("{:?} Encoder", pass_desc.label);
+            let pass_desc = (*pass_desc).borrow();
+
+            let label = format!("{:?} Encoder", pass_label.0);
 
             // encoders are not needed for presenter nodes.
-            let encoder = if pass_desc.pass_type.should_have_pipeline() {
+            let encoder = if pass_desc.ty.should_have_pipeline() {
                 Some(
                     self.device
                         .create_command_encoder(&wgpu::CommandEncoderDescriptor {
@@ -333,17 +336,17 @@ impl RenderGraph {
             // clone of the Rc's is required to appease the borrow checker
             let device = self.device.clone();
             let queue = self.queue.clone();
-            let mut context = RenderGraphContext::new(&device, &queue, encoder);
+            let mut context = RenderGraphContext::new(&device, &queue, encoder, pass_label.clone());
 
             // all encoders need to be submitted before a presenter node is executed.
-            if pass_desc.pass_type == RenderPassType::Presenter {
+            if pass_desc.ty == NodeType::Presenter {
                 trace!("Submitting {} encoderd before presenting", encoders.len());
                 self.queue.submit(encoders.drain(..));
             }
 
-            trace!("Executing {:?}", pass_desc.label);
+            trace!("Executing {:?}", pass_label.0);
             let mut inner = pass_inn.borrow_mut();
-            inner.execute(self, &*pass_desc, &mut context);
+            inner.execute(self, &pass_desc, &mut context);
 
             if let Some(encoder) = context.encoder {
                 encoders.push(encoder.finish());
@@ -361,49 +364,52 @@ impl RenderGraph {
         }
     }
 
-    pub fn slot_value(&self, id: u64) -> Option<&SlotValue> {
-        self.slots.get(&id).map(|s| &s.value)
+    pub fn slot_value<L: Into<RenderGraphLabelValue>>(&self, label: L) -> Option<&SlotValue> {
+        self.slots.get(&label.into()).map(|s| &s.value)
     }
 
-    pub fn slot_value_mut(&mut self, id: u64) -> Option<&mut SlotValue> {
-        self.slots.get_mut(&id).map(|s| &mut s.value)
+    pub fn slot_value_mut<L: Into<RenderGraphLabelValue>>(&mut self, label: L) -> Option<&mut SlotValue> {
+        self.slots.get_mut(&label.into()).map(|s| &mut s.value)
     }
 
-    pub fn pass(&self, id: u64) -> Option<&RenderGraphPassDesc> {
-        self.passes.get(&id).map(|s| &*s.desc)
+    pub fn node_desc<L: Into<RenderGraphLabelValue>>(&self, label: L) -> Option<Ref<NodeDesc>> {
+        self.passes.get(&label.into()).map(|s| (*s.desc).borrow())
     }
 
     #[inline(always)]
-    pub fn pipeline(&self, id: u64) -> &Pipeline {
-        &self.pipelines.get(&id).unwrap().pipeline
+    pub fn pipeline<L: Into<RenderGraphLabelValue>>(&self, label: L) -> Option<Ref<Pipeline>> {
+        self.passes.get(&label.into())
+            .and_then(|p| {
+                let v = p.pipeline.borrow();
+
+                match &*v {
+                    Some(_) => Some(Ref::map(v, |p| &p.as_ref().unwrap().pipeline)),
+                    None => None,
+                }
+            })
     }
 
     #[inline(always)]
-    pub fn try_bind_group(&self, id: u64) -> Option<&Rc<wgpu::BindGroup>> {
-        self.bind_groups.get(&id).map(|e| &e.bg)
+    pub fn try_bind_group<L: Into<RenderGraphLabelValue>>(&self, label: L) -> Option<&Rc<wgpu::BindGroup>> {
+        self.bind_groups.get(&label.into()).map(|e| &e.bg)
     }
 
     #[inline(always)]
-    pub fn bind_group(&self, id: u64) -> &Rc<wgpu::BindGroup> {
-        self.try_bind_group(id).expect("Unknown id for bind group")
+    pub fn bind_group<L: Into<RenderGraphLabelValue>>(&self, label: L) -> &Rc<wgpu::BindGroup> {
+        self.try_bind_group(label).expect("Unknown id for bind group")
     }
 
     #[inline(always)]
-    pub fn try_bind_group_layout(&self, id: u64) -> Option<&Rc<wgpu::BindGroupLayout>> {
-        self.bind_groups.get(&id).and_then(|e| e.layout.as_ref())
+    pub fn try_bind_group_layout<L: Into<RenderGraphLabelValue>>(&self, label: L) -> Option<&Rc<wgpu::BindGroupLayout>> {
+        self.bind_groups.get(&label.into()).and_then(|e| e.layout.as_ref())
     }
 
     #[inline(always)]
-    pub fn bind_group_layout(&self, id: u64) -> &Rc<wgpu::BindGroupLayout> {
-        self.try_bind_group_layout(id)
+    pub fn bind_group_layout<L: Into<RenderGraphLabelValue>>(&self, label: L) -> &Rc<wgpu::BindGroupLayout> {
+        self.try_bind_group_layout(label)
             .expect("Unknown id for bind group layout")
     }
 
-    #[inline(always)]
-    pub fn bind_group_id(&self, label: &dyn RenderGraphLabel) -> Option<u64> {
-        self.bind_group_names.get(&label.rc_clone().into()).copied()
-    }
-
     pub fn add_edge(&mut self, from: impl RenderGraphLabel, to: impl RenderGraphLabel)
     {
         let from = RenderGraphLabelValue::from(from);
@@ -412,13 +418,13 @@ impl RenderGraph {
         let from_idx = self
             .passes
             .iter()
-            .find(|p| p.1.desc.label == from)
+            .find(|p| *p.0 == from)
             .map(|p| p.1.graph_index)
             .expect("Failed to find from pass");
         let to_idx = self
             .passes
             .iter()
-            .find(|p| p.1.desc.label == to)
+            .find(|p| *p.0 == to)
             .map(|p| p.1.graph_index)
             .expect("Failed to find to pass");
 
@@ -438,13 +444,13 @@ impl RenderGraph {
     /// graph.set_bind_groups(
     ///     &mut pass,
     ///     &[
-    ///         // retrieves the "depth_texture" bind group and sets the index 0 in the
+    ///         // retrieves the `BasePassSlots::DepthTexture` bind group and sets the index 0 in the
     ///         // pass to it.
-    ///         ("depth_texture", 0),
-    ///         ("camera", 1),
-    ///         ("light_buffers", 2),
-    ///         ("light_indices_grid", 3),
-    ///         ("screen_size", 4),
+    ///         (&BasePassSlots::DepthTexture, 0),
+    ///         (&BasePassSlots::Camera, 1),
+    ///         (&LightBasePassSlots::Lights, 2),
+    ///         (&LightCullComputePassSlots::LightIndicesGridGroup, 3),
+    ///         (&BasePassSlots::ScreenSize, 4),
     ///     ],
     /// );
     /// ```
@@ -458,9 +464,8 @@ impl RenderGraph {
     ) {
         for (label, index) in bind_groups {
             let bg = self
-                .bind_group_id(*label)
-                .map(|bgi| self.bind_group(bgi))
-                .expect(&format!("Could not find bind group '{:?}'", label));
+                .bind_group(label.rc_clone());
+                //.expect(&format!("Could not find bind group '{:?}'", label));
 
             pass.set_bind_group(*index, bg, &[]);
         }
@@ -477,22 +482,28 @@ pub(crate) struct GraphBufferWrite {
 
 #[allow(dead_code)]
 pub struct RenderGraphContext<'a> {
-    /// Becomes None when the encoder is submitted
-    pub(crate) encoder: Option<wgpu::CommandEncoder>,
-    pub(crate) device: &'a wgpu::Device,
-    pub(crate) queue: &'a wgpu::Queue,
+    /// The [`wgpu::CommandEncoder`] used to encode GPU operations.
+    /// 
+    /// This is `None` during the `prepare` stage.
+    pub encoder: Option<wgpu::CommandEncoder>,
+    /// The gpu device that is being used.
+    pub device: &'a wgpu::Device,
+    pub queue: &'a wgpu::Queue,
     pub(crate) buffer_writes: VecDeque<GraphBufferWrite>,
     renderpass_desc: Vec<wgpu::RenderPassDescriptor<'a, 'a>>,
+    /// The label of this Node.
+    pub label: RenderGraphLabelValue,
 }
 
 impl<'a> RenderGraphContext<'a> {
-    pub(crate) fn new(device: &'a wgpu::Device, queue: &'a wgpu::Queue, encoder: Option<wgpu::CommandEncoder>) -> Self {
+    pub(crate) fn new(device: &'a wgpu::Device, queue: &'a wgpu::Queue, encoder: Option<wgpu::CommandEncoder>, label: RenderGraphLabelValue) -> Self {
         Self {
             encoder,
             device,
             queue,
             buffer_writes: Default::default(),
             renderpass_desc: vec![],
+            label,
         }
     }
 

lyra-game/src/render/graph/node.rs

@@ -1,5 +1,6 @@
-use std::{cell::{Ref, RefCell, RefMut}, collections::HashMap, num::NonZeroU32, rc::Rc};
+use std::{cell::{Ref, RefCell, RefMut}, num::NonZeroU32, rc::Rc};
 
+use bind_match::bind_match;
 use lyra_ecs::World;
 
 use crate::render::resource::PipelineDescriptor;
@@ -7,26 +8,31 @@ use crate::render::resource::PipelineDescriptor;
 use super::{RenderGraph, RenderGraphContext, RenderGraphLabel, RenderGraphLabelValue, RenderTarget};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Default)]
-pub enum RenderPassType {
+pub enum NodeType {
     /// A node doesn't render, compute, or present anything. This likely means it injects data into the graph.
-    Node,
-    Compute,
     #[default]
+    Node,
+    /// A Compute pass node type.
+    Compute,
+    /// A render pass node type.
     Render,
+    /// A node that presents render results to a render target.
     Presenter,
 }
 
-impl RenderPassType {
+impl NodeType {
+    /// Returns a boolean indicating if the node should have a [`Pipeline`](crate::render::resource::Pipeline).
     pub fn should_have_pipeline(&self) -> bool {
         match self {
-            RenderPassType::Node => false,
-            RenderPassType::Compute => true,
-            RenderPassType::Render => true,
-            RenderPassType::Presenter => false,
+            NodeType::Node => false,
+            NodeType::Compute => true,
+            NodeType::Render => true,
+            NodeType::Presenter => false,
         }
     }
 }
 
+/// The type of data that is stored in a [`Node`] slot.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
 pub enum SlotType {
     TextureView,
@@ -36,10 +42,13 @@ pub enum SlotType {
     RenderTarget,
 }
 
+/// The value of a slot in a [`Node`].
 #[derive(Debug, Clone)]
 pub enum SlotValue {
+    /// This slot doesn't have any value
     None,
-    /// The value will be set during a later phase of the render graph.
+    /// The value will be set during a later phase of the render graph. To see the type of value
+    /// this will be set to, see the slots type.
     Lazy,
     TextureView(Rc<wgpu::TextureView>),
     Sampler(Rc<wgpu::Sampler>),
@@ -49,56 +58,49 @@ pub enum SlotValue {
 }
 
 impl SlotValue {
-    /// Gets `self` as a texture, panics if self is not a instance of [`SlotValue::Texture`].
-    pub fn as_texture(&self) -> &wgpu::Texture {
-        match self {
-            Self::Texture(v) => v,
-            _ => panic!("self is not an instance of SlotValue::Texture"),
-        }
+    pub fn as_texture_view(&self) -> Option<&Rc<wgpu::TextureView>> {
+        bind_match!(self, Self::TextureView(v) => v)
     }
 
-    pub fn as_texture_view(&self) -> &wgpu::TextureView {
-        match self {
-            Self::TextureView(v) => v,
-            _ => panic!("self is not an instance of SlotValue::TextureView"),
-        }
+    pub fn as_sampler(&self) -> Option<&Rc<wgpu::Sampler>> {
+        bind_match!(self, Self::Sampler(v) => v)
     }
 
-    pub fn as_buffer(&self) -> Option<&wgpu::Buffer> {
-        match self {
-            Self::Buffer(v) => Some(v),
-            _ => None,
-        }
+    pub fn as_texture(&self) -> Option<&Rc<wgpu::Texture>> {
+        bind_match!(self, Self::Texture(v) => v)
+    }
+
+    pub fn as_buffer(&self) -> Option<&Rc<wgpu::Buffer>> {
+        bind_match!(self, Self::Buffer(v) => v)
     }
 
     pub fn as_render_target(&self) -> Option<Ref<RenderTarget>> {
-        match self {
-            Self::RenderTarget(v) => Some(v.borrow()),
-            _ => None,
-        }
+        bind_match!(self, Self::RenderTarget(v) => v.borrow())
     }
 
     pub fn as_render_target_mut(&mut self) -> Option<RefMut<RenderTarget>> {
-        match self {
-            Self::RenderTarget(v) => Some(v.borrow_mut()),
-            _ => None,
-        }
+        bind_match!(self, Self::RenderTarget(v) => v.borrow_mut())
     }
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
 pub enum SlotAttribute {
+    /// This slot inputs a value into the node, expecting another node to `Output` it.
     Input,
+    /// This slot outputs a value from the node, providing the value to other nodes that
+    /// `Input`it.
     Output,
 }
 
 #[derive(Clone)]
-pub struct RenderPassSlot {
+pub struct NodeSlot {
+    /// The type of the value that this slot inputs/outputs.
     pub ty: SlotType,
+    /// The way this slot uses the value. Defines if this slot is an output or input.
     pub attribute: SlotAttribute,
-    pub id: u64,
+    /// The identifying label of this slot.
     pub label: RenderGraphLabelValue,
-    /// The descriptor of the slot value.
-    /// This will be `None` if this slot is an input.
+    /// The value of the slot.
+    /// This is `None` if the slot is a `SlotAttribute::Input` type.
     pub value: Option<SlotValue>,
 }
 
@@ -157,13 +159,20 @@ impl RenderGraphPipelineInfo {
     }
 }
 
-pub struct RenderGraphPassDesc {
-    pub id: u64,
-    pub label: RenderGraphLabelValue,
-    pub pass_type: RenderPassType,
-    pub slots: Vec<RenderPassSlot>,
-    slot_label_lookup: HashMap<RenderGraphLabelValue, u64>,
+/// Descriptor of a Node in a [`RenderGraph`].
+pub struct NodeDesc {
+    /// The [`NodeType`] of the node.
+    pub ty: NodeType,
+    /// The slots that the Node uses.
+    /// This defines the resources that the node uses and creates in the graph.
+    pub slots: Vec<NodeSlot>,
+    //slot_label_lookup: HashMap<RenderGraphLabelValue, u64>,
+    /// An optional pipeline descriptor for the Node.
+    /// This is `None` if the Node type is not a node that requires a pipeline
+    /// (see [`NodeType::should_have_pipeline`]).
     pub pipeline_desc: Option<PipelineDescriptor>,
+    /// The bind groups that this Node creates.
+    /// This makes the bind groups accessible to other Nodes.
     pub bind_groups: Vec<(
         RenderGraphLabelValue,
         Rc<wgpu::BindGroup>,
@@ -171,20 +180,16 @@ pub struct RenderGraphPassDesc {
     )>,
 }
 
-impl RenderGraphPassDesc {
-    pub fn new<L: RenderGraphLabel>(
-        id: u64,
-        label: L,
-        pass_type: RenderPassType,
+impl NodeDesc {
+    /// Create a new node descriptor.
+    pub fn new(
+        pass_type: NodeType,
         pipeline_desc: Option<PipelineDescriptor>,
         bind_groups: Vec<(&dyn RenderGraphLabel, Rc<wgpu::BindGroup>, Option<Rc<wgpu::BindGroupLayout>>)>,
     ) -> Self {
         Self {
-            id,
-            label: label.into(),
-            pass_type,
+            ty: pass_type,
             slots: vec![],
-            slot_label_lookup: HashMap::default(),
             pipeline_desc,
             bind_groups: bind_groups
                 .into_iter()
@@ -193,20 +198,27 @@ impl RenderGraphPassDesc {
         }
     }
 
-    pub fn add_slot(&mut self, slot: RenderPassSlot) {
+    /// Add a slot to the descriptor.
+    /// 
+    /// In debug builds, there is an assert that triggers if the slot is an input slot and has
+    /// a value set.
+    pub fn add_slot(&mut self, slot: NodeSlot) {
         debug_assert!(
             !(slot.attribute == SlotAttribute::Input && slot.value.is_some()),
             "input slots should not have values"
         );
 
-        self.slot_label_lookup.insert(slot.label.clone().into(), slot.id);
         self.slots.push(slot);
     }
 
+    /// Add a buffer slot to the descriptor.
+    /// 
+    /// In debug builds, there is an assert that triggers if the slot is an input slot and has
+    /// a value set. There is also an assert that is triggered if this slot value is not `None`,
+    /// `SlotValue::Lazy` or a `Buffer`.
     #[inline(always)]
     pub fn add_buffer_slot<L: RenderGraphLabel>(
         &mut self,
-        id: u64,
         label: L,
         attribute: SlotAttribute,
         value: Option<SlotValue>,
@@ -216,8 +228,7 @@ impl RenderGraphPassDesc {
             "slot value is not a buffer"
         );
 
-        let slot = RenderPassSlot {
-            id,
+        let slot = NodeSlot {
             label: label.into(),
             ty: SlotType::Buffer,
             attribute,
@@ -226,10 +237,14 @@ impl RenderGraphPassDesc {
         self.add_slot(slot);
     }
 
+    /// Add a slot that stores a [`wgpu::Texture`] to the descriptor.
+    /// 
+    /// In debug builds, there is an assert that triggers if the slot is an input slot and has
+    /// a value set. There is also an assert that is triggered if this slot value is not `None`,
+    /// `SlotValue::Lazy` or a `SlotValue::Texture`.
     #[inline(always)]
     pub fn add_texture_slot<L: RenderGraphLabel>(
         &mut self,
-        id: u64,
         label: L,
         attribute: SlotAttribute,
         value: Option<SlotValue>,
@@ -239,8 +254,7 @@ impl RenderGraphPassDesc {
             "slot value is not a texture"
         );
 
-        let slot = RenderPassSlot {
-            id,
+        let slot = NodeSlot {
             label: label.into(),
             ty: SlotType::Texture,
             attribute,
@@ -249,10 +263,14 @@ impl RenderGraphPassDesc {
         self.add_slot(slot);
     }
 
+    /// Add a slot that stores a [`wgpu::TextureView`] to the descriptor.
+    /// 
+    /// In debug builds, there is an assert that triggers if the slot is an input slot and has
+    /// a value set. There is also an assert that is triggered if this slot value is not `None`,
+    /// `SlotValue::Lazy` or a `SlotValue::TextureView`.
     #[inline(always)]
     pub fn add_texture_view_slot<L: RenderGraphLabel>(
         &mut self,
-        id: u64,
         label: L,
         attribute: SlotAttribute,
         value: Option<SlotValue>,
@@ -262,8 +280,7 @@ impl RenderGraphPassDesc {
             "slot value is not a texture view"
         );
 
-        let slot = RenderPassSlot {
-            id,
+        let slot = NodeSlot {
             label: label.into(),
             ty: SlotType::TextureView,
             attribute,
@@ -272,10 +289,14 @@ impl RenderGraphPassDesc {
         self.add_slot(slot);
     }
 
+    /// Add a slot that stores a [`wgpu::Sampler`] to the descriptor.
+    /// 
+    /// In debug builds, there is an assert that triggers if the slot is an input slot and has
+    /// a value set. There is also an assert that is triggered if this slot value is not `None`,
+    /// `SlotValue::Lazy` or a `SlotValue::Sampler`.
     #[inline(always)]
     pub fn add_sampler_slot<L: RenderGraphLabel>(
         &mut self,
-        id: u64,
         label: L,
         attribute: SlotAttribute,
         value: Option<SlotValue>,
@@ -285,8 +306,7 @@ impl RenderGraphPassDesc {
             "slot value is not a sampler"
         );
 
-        let slot = RenderPassSlot {
-            id,
+        let slot = NodeSlot {
             label: label.into(),
             ty: SlotType::Sampler,
             attribute,
@@ -295,14 +315,16 @@ impl RenderGraphPassDesc {
         self.add_slot(slot);
     }
 
-    pub fn input_slots(&self) -> Vec<&RenderPassSlot> {
+    /// Returns all input slots that the descriptor defines.
+    pub fn input_slots(&self) -> Vec<&NodeSlot> {
         self.slots
             .iter()
             .filter(|s| s.attribute == SlotAttribute::Input)
             .collect()
     }
 
-    pub fn output_slots(&self) -> Vec<&RenderPassSlot> {
+    /// Returns all output slots that the descriptor defines.
+    pub fn output_slots(&self) -> Vec<&NodeSlot> {
         self.slots
             .iter()
             .filter(|s| s.attribute == SlotAttribute::Output)
@@ -310,17 +332,34 @@ impl RenderGraphPassDesc {
     }
 }
 
-pub trait RenderGraphPass: 'static {
-    /// Create a render pass describer.
-    ///
-    /// The `id` argument is passed as mutable so you can increment it as you use it for new slots.
-    fn desc<'a, 'b>(&'a mut self, graph: &'b mut RenderGraph) -> RenderGraphPassDesc;
+/// A node that can be executed and scheduled in a [`RenderGraph`].
+/// 
+/// A node can be used for rendering, computing data on the GPU, collecting data from the main
+/// world and writing it to GPU buffers, or presenting renders to a surface.
+/// 
+/// The [`RenderGraph`] is ran in phases. The first phase is `prepare`, then `execute`. When a node
+/// is first added to a RenderGraph, its [`Node::desc`] function will be ran. The descriptor
+/// describes all resources the node requires for execution during the `execute` phase. 
+pub trait Node: 'static {
+    /// Retrieve a descriptor of the Node.
+    fn desc<'a, 'b>(&'a mut self, graph: &'b mut RenderGraph) -> NodeDesc;
 
+    /// Prepare the node for rendering.
+    /// 
+    /// This phase runs before `execute` and is meant to be used to collect data from the World
+    /// and write to GPU buffers.
     fn prepare(&mut self, world: &mut World, context: &mut RenderGraphContext);
+    
+    /// Execute the node.
+    /// 
+    /// Parameters:
+    /// * `graph` - The RenderGraph that this node is a part of. Can be used to get bind groups and bind to them.
+    /// * `desc` - The descriptor of this node.
+    /// * `context` - The rendering graph context.
     fn execute(
         &mut self,
         graph: &mut RenderGraph,
-        desc: &RenderGraphPassDesc,
+        desc: &NodeDesc,
         context: &mut RenderGraphContext,
     );
 }

lyra-game/src/render/graph/passes/base.rs

@@ -9,8 +9,8 @@ use crate::{
     render::{
         camera::{CameraUniform, RenderCamera},
         graph::{
-            RenderGraphContext, RenderGraphPass, RenderGraphPassDesc, RenderPassSlot,
-            RenderPassType, RenderTarget, SlotAttribute, SlotType, SlotValue,
+            RenderGraphContext, Node, NodeDesc, NodeSlot,
+            NodeType, RenderTarget, SlotAttribute, SlotType, SlotValue,
         },
         render_buffer::BufferWrapper, texture::RenderTexture,
     },
@@ -40,8 +40,6 @@ pub struct BasePass {
     /// This should be Some when the pass is first created then after its added to
     /// the render graph it will be None and stay None.
     temp_render_target: Option<RenderTarget>,
-    main_rt_id: u64,
-    window_tv_id: u64,
     screen_size: glam::UVec2,
 }
 
@@ -61,11 +59,11 @@ impl BasePass {
     }
 }
 
-impl RenderGraphPass for BasePass {
+impl Node for BasePass {
     fn desc(
         &mut self,
         graph: &mut crate::render::graph::RenderGraph,
-    ) -> crate::render::graph::RenderGraphPassDesc {
+    ) -> crate::render::graph::NodeDesc {
         let render_target = self.temp_render_target.take().unwrap();
         self.screen_size = UVec2::new(
             render_target.surface_config.width,
@@ -101,49 +99,46 @@ impl RenderGraphPass for BasePass {
         let depth_texture_bgl = dt_bg_pair.layout;
         let depth_texture_view = Rc::new(depth_texture.view);
 
-        let mut desc = RenderGraphPassDesc::new(
-            graph.next_id(),
-            BasePassLabel,
-            RenderPassType::Node,
+        let mut desc = NodeDesc::new(
+            NodeType::Node,
             None,
             vec![
+                // TODO: Make this a trait maybe?
+                // Could impl it for (RenderGraphLabel, wgpu::BindGroup) and also
+                // (RenderGraphLabel, wgpu::BindGroup, wgpu::BindGroupLabel) AND
+                // (RenderGraphLabel, wgpu::BindGroup, Option<wgpu::BindGroupLabel>)
+                //
+                // This could make it slightly easier to create this
                 (&BasePassSlots::DepthTexture, depth_texture_bg, Some(depth_texture_bgl)),
                 (&BasePassSlots::ScreenSize, screen_size_bg, Some(screen_size_bgl)),
                 (&BasePassSlots::Camera, camera_bg, Some(camera_bgl)),
             ],
         );
 
-        self.main_rt_id = graph.next_id();
-        desc.add_slot(RenderPassSlot {
+        desc.add_slot(NodeSlot {
             ty: SlotType::RenderTarget,
             attribute: SlotAttribute::Output,
-            id: self.main_rt_id,
             label: BasePassSlots::MainRenderTarget.into(),
             value: Some(SlotValue::RenderTarget(Rc::new(RefCell::new(
                 render_target,
             )))),
         });
-        self.window_tv_id = graph.next_id();
         desc.add_texture_view_slot(
-            self.window_tv_id,
             BasePassSlots::WindowTextureView,
             SlotAttribute::Output,
             Some(SlotValue::Lazy),
         );
         desc.add_texture_view_slot(
-            graph.next_id(),
             BasePassSlots::DepthTextureView,
             SlotAttribute::Output,
             Some(SlotValue::TextureView(depth_texture_view)),
         );
         desc.add_buffer_slot(
-            graph.next_id(),
             BasePassSlots::ScreenSize,
             SlotAttribute::Output,
             Some(SlotValue::Buffer(Rc::new(screen_size_buf))),
         );
         desc.add_buffer_slot(
-            graph.next_id(),
             BasePassSlots::Camera,
             SlotAttribute::Output,
             Some(SlotValue::Buffer(Rc::new(camera_buf))),
@@ -167,11 +162,11 @@ impl RenderGraphPass for BasePass {
     fn execute(
         &mut self,
         graph: &mut crate::render::graph::RenderGraph,
-        _desc: &crate::render::graph::RenderGraphPassDesc,
+        _desc: &crate::render::graph::NodeDesc,
         context: &mut crate::render::graph::RenderGraphContext,
     ) {
         let tv_slot = graph
-            .slot_value_mut(self.main_rt_id)
+            .slot_value_mut(BasePassSlots::MainRenderTarget)
             .expect("somehow the main render target slot is missing");
         let mut rt = tv_slot.as_render_target_mut().unwrap();
         debug_assert!(
@@ -197,7 +192,7 @@ impl RenderGraphPass for BasePass {
 
         // store the surface texture to the slot
         let tv_slot = graph
-            .slot_value_mut(self.window_tv_id)
+            .slot_value_mut(BasePassSlots::WindowTextureView)
             .expect("somehow the window texture view slot is missing");
         *tv_slot = SlotValue::TextureView(Rc::new(view));
     }

lyra-game/src/render/graph/passes/depth_prepass.rs

@@ -1,94 +0,0 @@
-use glam::UVec2;
-
-use crate::render::{
-    camera::CameraUniform,
-    graph::{
-        BufferInitDescriptor, RenderGraphPass, RenderGraphPassDesc, RenderPassType, SamplerDescriptor, SlotAttribute, SlotDescriptor, TextureDescriptor, TextureViewDescriptor
-    },
-};
-
-/// Supplies some basic things other passes needs.
-///
-/// screen size buffer, camera buffer,
-#[derive(Default)]
-pub struct DepthPrePass;
-
-impl DepthPrePass {
-    pub fn new() -> Self {
-        Self::default()
-    }
-}
-
-impl RenderGraphPass for DepthPrePass {
-    fn desc(
-        &self,
-        graph: &mut crate::render::graph::RenderGraph,
-        id: &mut u64,
-    ) -> crate::render::graph::RenderGraphPassDesc {
-        let mut desc = RenderGraphPassDesc::new(*id, "DepthPrePass", RenderPassType::Compute);
-        *id += 1;
-
-        let size = wgpu::Extent3d {
-            width: graph.surface_config.width,
-            height: graph.surface_config.height,
-            depth_or_array_layers: 1,
-        };
-
-        desc.add_texture_slot(
-            *id,
-            "depth_texture",
-            SlotAttribute::Output,
-            Some(SlotDescriptor::Texture(TextureDescriptor {
-                size,
-                mip_level_count: 1,
-                sample_count: 1,
-                dimension: wgpu::TextureDimension::D2,
-                format: wgpu::TextureFormat::Depth32Float,
-                usage: wgpu::TextureUsages::RENDER_ATTACHMENT
-                    | wgpu::TextureUsages::TEXTURE_BINDING,
-                view_formats: vec![],
-            })),
-        );
-        *id += 1;
-
-        desc.add_texture_view_slot(
-            *id,
-            "depth_texture_view",
-            SlotAttribute::Output,
-            Some(SlotDescriptor::TextureView(TextureViewDescriptor::default_view("depth_texture"))),
-        );
-        *id += 1;
-        
-        desc.add_texture_view_slot(
-            *id,
-            "depth_texture_sampler",
-            SlotAttribute::Output,
-            Some(SlotDescriptor::Sampler(SamplerDescriptor {
-                mag_filter: wgpu::FilterMode::Linear,
-                min_filter: wgpu::FilterMode::Linear,
-                compare: Some(wgpu::CompareFunction::LessEqual),
-                lod_min_clamp: 0.0,
-                lod_max_clamp: 100.0,
-                ..SamplerDescriptor::default_sampler("depth_texture")
-            })),
-        );
-        *id += 1;
-
-        desc
-    }
-
-    fn prepare(&mut self, world: &mut lyra_ecs::World) {
-        let _ = world;
-        todo!()
-    }
-
-    fn execute(
-        &mut self,
-        graph: &mut crate::render::graph::RenderGraph,
-        desc: &crate::render::graph::RenderGraphPassDesc,
-        context: &mut crate::render::graph::RenderGraphContext,
-    ) {
-        let _ = (graph, desc, context);
-        todo!()
-    }
-}

lyra-game/src/render/graph/passes/light_base.rs

@@ -2,7 +2,7 @@ use lyra_game_derive::RenderGraphLabel;
 
 use crate::render::{
     graph::{
-        RenderGraphContext, RenderGraphPass, RenderGraphPassDesc, RenderPassType, SlotAttribute,
+        RenderGraphContext, Node, NodeDesc, NodeType, SlotAttribute,
         SlotValue,
     },
     light::LightUniformBuffers,
@@ -30,19 +30,17 @@ impl LightBasePass {
     }
 }
 
-impl RenderGraphPass for LightBasePass {
+impl Node for LightBasePass {
     fn desc(
         &mut self,
         graph: &mut crate::render::graph::RenderGraph,
-    ) -> crate::render::graph::RenderGraphPassDesc {
+    ) -> crate::render::graph::NodeDesc {
         let device = &graph.device;
         self.light_buffers = Some(LightUniformBuffers::new(device));
         let light_buffers = self.light_buffers.as_ref().unwrap();
 
-        let mut desc = RenderGraphPassDesc::new(
-            graph.next_id(),
-            LightBasePassLabel,
-            RenderPassType::Node,
+        let mut desc = NodeDesc::new(
+            NodeType::Node,
             None,
             vec![(
                 &LightBasePassSlots::Lights,
@@ -52,7 +50,6 @@ impl RenderGraphPass for LightBasePass {
         );
 
         desc.add_buffer_slot(
-            graph.next_id(),
             LightBasePassSlots::Lights,
             SlotAttribute::Output,
             Some(SlotValue::Buffer(light_buffers.buffer.clone())),
@@ -70,7 +67,7 @@ impl RenderGraphPass for LightBasePass {
     fn execute(
         &mut self,
         _graph: &mut crate::render::graph::RenderGraph,
-        _desc: &crate::render::graph::RenderGraphPassDesc,
+        _desc: &crate::render::graph::NodeDesc,
         _context: &mut crate::render::graph::RenderGraphContext,
     ) {
     }

lyra-game/src/render/graph/passes/light_cull_compute.rs

@@ -6,7 +6,7 @@ use wgpu::util::DeviceExt;
 
 use crate::render::{
     graph::{
-        RenderGraphContext, RenderGraphPass, RenderGraphPassDesc, RenderPassType, SlotAttribute,
+        RenderGraphContext, Node, NodeDesc, NodeType, SlotAttribute,
         SlotValue,
     },
     resource::{ComputePipelineDescriptor, PipelineDescriptor, Shader},
@@ -37,11 +37,11 @@ impl LightCullComputePass {
     }
 }
 
-impl RenderGraphPass for LightCullComputePass {
+impl Node for LightCullComputePass {
     fn desc(
         &mut self,
         graph: &mut crate::render::graph::RenderGraph,
-    ) -> crate::render::graph::RenderGraphPassDesc {
+    ) -> crate::render::graph::NodeDesc {
         let shader = Rc::new(Shader {
             label: Some("light_cull_comp_shader".into()),
             source: include_str!("../../shaders/light_cull.comp.wgsl").to_string(),
@@ -49,8 +49,7 @@ impl RenderGraphPass for LightCullComputePass {
 
         // get the size of the work group for the grid
         let main_rt = graph
-            .slot_id(&BasePassSlots::MainRenderTarget)
-            .and_then(|s| graph.slot_value(s))
+            .slot_value(BasePassSlots::MainRenderTarget)
             .and_then(|s| s.as_render_target())
             .expect("missing main render target");
         self.workgroup_size =
@@ -169,17 +168,14 @@ impl RenderGraphPass for LightCullComputePass {
         }));
 
         drop(main_rt);
-        let pass_id = graph.next_id();
 
-        let depth_tex_bgl = graph.bind_group_layout(graph.bind_group_id(&BasePassSlots::DepthTexture).unwrap());
-        let camera_bgl = graph.bind_group_layout(graph.bind_group_id(&BasePassSlots::Camera).unwrap());
-        let lights_bgl = graph.bind_group_layout(graph.bind_group_id(&LightBasePassSlots::Lights).unwrap());
-        let screen_size_bgl = graph.bind_group_layout(graph.bind_group_id(&BasePassSlots::ScreenSize).unwrap());
+        let depth_tex_bgl = graph.bind_group_layout(BasePassSlots::DepthTexture);
+        let camera_bgl = graph.bind_group_layout(BasePassSlots::Camera);
+        let lights_bgl = graph.bind_group_layout(LightBasePassSlots::Lights);
+        let screen_size_bgl = graph.bind_group_layout(BasePassSlots::ScreenSize);
 
-        let mut desc = RenderGraphPassDesc::new(
-            pass_id,
-            LightCullComputePassLabel,
-            RenderPassType::Compute,
+        let mut desc = NodeDesc::new(
+            NodeType::Compute,
             Some(PipelineDescriptor::Compute(ComputePipelineDescriptor {
                 label: Some("light_cull_pipeline".into()),
                 push_constant_ranges: vec![],
@@ -201,20 +197,17 @@ impl RenderGraphPass for LightCullComputePass {
         );
 
         desc.add_texture_view_slot(
-            graph.next_id(),
             BasePassSlots::WindowTextureView,
             SlotAttribute::Input,
             None,
         );
         desc.add_buffer_slot(
-            graph.next_id(),
             BasePassSlots::ScreenSize,
             SlotAttribute::Input,
             None,
         );
-        desc.add_buffer_slot(graph.next_id(), BasePassSlots::Camera, SlotAttribute::Input, None);
+        desc.add_buffer_slot(BasePassSlots::Camera, SlotAttribute::Input, None);
         desc.add_buffer_slot(
-            graph.next_id(),
             LightCullComputePassSlots::IndexCounterBuffer,
             SlotAttribute::Output,
             Some(SlotValue::Buffer(Rc::new(light_index_counter_buffer))),
@@ -228,27 +221,20 @@ impl RenderGraphPass for LightCullComputePass {
     fn execute(
         &mut self,
         graph: &mut crate::render::graph::RenderGraph,
-        desc: &crate::render::graph::RenderGraphPassDesc,
+        _: &crate::render::graph::NodeDesc,
         context: &mut RenderGraphContext,
     ) {
+        let label = context.label.clone();
+
+        let pipeline = graph.pipeline(label)
+            .expect("Failed to find Pipeline for LightCullComputePass");
+        let pipeline = pipeline.as_compute();
+        
         let mut pass = context.begin_compute_pass(&wgpu::ComputePassDescriptor {
             label: Some("light_cull_pass"),
         });
 
-        let pipeline = graph.pipeline(desc.id);
-        pass.set_pipeline(pipeline.as_compute());
-
-        /* let depth_tex_bg = graph.bind_group(graph.bind_group_id("depth_texture").unwrap());
-        let camera_bg = graph.bind_group(graph.bind_group_id("camera").unwrap());
-        let lights_bg = graph.bind_group(graph.bind_group_id("light_buffers").unwrap());
-        let grid_bg = graph.bind_group(graph.bind_group_id("light_indices_grid").unwrap());
-        let screen_size_bg = graph.bind_group(graph.bind_group_id("screen_size").unwrap());
-
-        pass.set_bind_group(0, depth_tex_bg, &[]);
-        pass.set_bind_group(1, camera_bg, &[]);
-        pass.set_bind_group(2, lights_bg, &[]);
-        pass.set_bind_group(3, grid_bg, &[]);
-        pass.set_bind_group(4, screen_size_bg, &[]); */
+        pass.set_pipeline(pipeline);
 
         graph.set_bind_groups(
             &mut pass,

lyra-game/src/render/graph/passes/meshes.rs

@@ -15,8 +15,8 @@ use wgpu::util::DeviceExt;
 use crate::{
     render::{
         desc_buf_lay::DescVertexBufferLayout, graph::{
-            RenderGraphContext, RenderGraphPass, RenderGraphPassDesc,
-            RenderPassType,
+            RenderGraphContext, Node, NodeDesc,
+            NodeType,
         }, material::{Material, MaterialUniform}, render_buffer::{BufferStorage, BufferWrapper}, render_job::RenderJob, resource::{FragmentState, PipelineDescriptor, RenderPipelineDescriptor, Shader, VertexState}, texture::RenderTexture, transform_buffer_storage::{TransformBuffers, TransformGroup}, vertex::Vertex
     },
     DeltaTime,
@@ -201,11 +201,11 @@ impl MeshPass {
     }
 }
 
-impl RenderGraphPass for MeshPass {
+impl Node for MeshPass {
     fn desc(
         &mut self,
         graph: &mut crate::render::graph::RenderGraph,
-    ) -> crate::render::graph::RenderGraphPassDesc {
+    ) -> crate::render::graph::NodeDesc {
         
         let device = graph.device();
         
@@ -232,31 +232,24 @@ impl RenderGraphPass for MeshPass {
         self.default_texture = Some(RenderTexture::from_bytes(&device, &graph.queue, texture_bind_group_layout.clone(), bytes, "default_texture").unwrap());
 
         // get surface config format
-        let main_rt = graph.slot_id(&BasePassSlots::MainRenderTarget)
-            .and_then(|s| graph.slot_value(s))
+        let main_rt = graph.slot_value(BasePassSlots::MainRenderTarget)
             .and_then(|s| s.as_render_target())
             .expect("missing main render target");
         let surface_config_format = main_rt.surface_config.format;
         drop(main_rt);
 
-        // get the id here to make borrow checker happy
-        let pass_id = graph.next_id();
-
-        let camera_bgl = graph.bind_group_layout(graph.bind_group_id(&BasePassSlots::Camera).unwrap());
-        let lights_bgl = graph.bind_group_layout(graph.bind_group_id(&LightBasePassSlots::Lights).unwrap());
+        let camera_bgl = graph.bind_group_layout(BasePassSlots::Camera);
+        let lights_bgl = graph.bind_group_layout(LightBasePassSlots::Lights);
         let light_grid_bgl = graph
-            .bind_group_layout(graph.bind_group_id(&LightCullComputePassSlots::LightIndicesGridGroup)
-                .expect("Missing light grid bind group"));
+            .bind_group_layout(LightCullComputePassSlots::LightIndicesGridGroup);
 
         let shader = Rc::new(Shader {
             label: Some("base_shader".into()),
             source: include_str!("../../shaders/base.wgsl").to_string(),
         });
 
-        let desc = RenderGraphPassDesc::new(
-            pass_id,
-            MeshesPassLabel,
-            RenderPassType::Render,
+        let desc = NodeDesc::new(
+            NodeType::Render,
             Some(PipelineDescriptor::Render(RenderPipelineDescriptor {
                 label: Some("meshes".into()),
                 layouts: vec![
@@ -445,36 +438,37 @@ impl RenderGraphPass for MeshPass {
     fn execute(
         &mut self,
         graph: &mut crate::render::graph::RenderGraph,
-        desc: &crate::render::graph::RenderGraphPassDesc,
+        _: &crate::render::graph::NodeDesc,
         context: &mut crate::render::graph::RenderGraphContext,
     ) {
         let encoder = context.encoder.as_mut().unwrap();
 
         let view = graph
-            .slot_value(graph.slot_id(&BasePassSlots::WindowTextureView).unwrap())
+            .slot_value(BasePassSlots::WindowTextureView)
             .unwrap()
-            .as_texture_view();
+            .as_texture_view()
+            .expect("BasePassSlots::WindowTextureView was not a TextureView slot");
 
         let depth_view = graph
-            .slot_value(graph.slot_id(&BasePassSlots::DepthTextureView).unwrap())
+            .slot_value(BasePassSlots::DepthTextureView)
             .unwrap()
-            .as_texture_view();
+            .as_texture_view()
+            .expect("BasePassSlots::DepthTextureView was not a TextureView slot");
 
         let camera_bg = graph
-            .bind_group(graph.bind_group_id(&BasePassSlots::Camera)
-                .expect("Missing camera bind group"));
+            .bind_group(BasePassSlots::Camera);
         
         let lights_bg = graph
-            .bind_group(graph.bind_group_id(&LightBasePassSlots::Lights)
-                .expect("Missing lights bind group"));
+            .bind_group(LightBasePassSlots::Lights);
 
         let light_grid_bg = graph
-            .bind_group(graph.bind_group_id(&LightCullComputePassSlots::LightIndicesGridGroup)
-                .expect("Missing light grid bind group"));
+            .bind_group(LightCullComputePassSlots::LightIndicesGridGroup);
 
         let material_bg = graph
-            .bind_group(graph.bind_group_id(&MeshesPassSlots::Material)
-                .expect("Missing material bind group"));
+            .bind_group(MeshesPassSlots::Material);
+
+        let pipeline = graph.pipeline(context.label.clone())
+            .expect("Failed to find pipeline for MeshPass");
 
         let mut pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
             label: Some("Render Pass"),
@@ -502,7 +496,6 @@ impl RenderGraphPass for MeshPass {
             }),
         });
 
-        let pipeline = graph.pipeline(desc.id);
         pass.set_pipeline(&pipeline.as_render());
 
         //let material_buffer_bg = self.material_buffer.as_ref().unwrap().bindgroup();

lyra-game/src/render/graph/passes/present_pass.rs

@@ -2,7 +2,7 @@ use std::hash::Hash;
 
 use lyra_game_derive::RenderGraphLabel;
 
-use crate::render::graph::{RenderGraphContext, RenderGraphLabel, RenderGraphLabelValue, RenderGraphPass, RenderGraphPassDesc, RenderPassSlot, RenderPassType, SlotAttribute, SlotType};
+use crate::render::graph::{RenderGraphContext, RenderGraphLabel, RenderGraphLabelValue, Node, NodeDesc, NodeSlot, NodeType, SlotAttribute, SlotType};
 
 #[derive(Debug, Clone, Hash, PartialEq, RenderGraphLabel)]
 pub struct PresentPassLabel(RenderGraphLabelValue);
@@ -18,8 +18,7 @@ impl PresentPassLabel {
 /// screen size buffer, camera buffer,
 pub struct PresentPass {
     /// Label of this pass
-    label: PresentPassLabel,
-    //render_target_slot: Rc<dyn RenderGraphLabel>,
+    pub label: PresentPassLabel,
 }
 
 impl PresentPass {
@@ -31,21 +30,18 @@ impl PresentPass {
     }
 }
 
-impl RenderGraphPass for PresentPass {
-    fn desc(&mut self, graph: &mut crate::render::graph::RenderGraph) -> crate::render::graph::RenderGraphPassDesc {
-        let mut desc = RenderGraphPassDesc::new(
-            graph.next_id(),
-            self.label.clone(),
-            RenderPassType::Presenter,
+impl Node for PresentPass {
+    fn desc(&mut self, _graph: &mut crate::render::graph::RenderGraph) -> crate::render::graph::NodeDesc {
+        let mut desc = NodeDesc::new(
+            NodeType::Presenter,
             None,
             vec![],
         );
 
         desc.add_slot(
-            RenderPassSlot {
+            NodeSlot {
                 ty: SlotType::RenderTarget,
                 attribute: SlotAttribute::Input,
-                id: graph.next_id(),
                 label: self.label.0.clone(),
                 value: None,
             }
@@ -58,10 +54,10 @@ impl RenderGraphPass for PresentPass {
         
     }
 
-    fn execute(&mut self, graph: &mut crate::render::graph::RenderGraph, _desc: &crate::render::graph::RenderGraphPassDesc, _context: &mut crate::render::graph::RenderGraphContext) {
-        let id = graph.slot_id_rc(&self.label.0)
-            .expect(&format!("render target slot '{:?}' for PresentPass is missing", self.label.0));
-        let mut slot = graph.slot_value_mut(id).unwrap().as_render_target_mut().unwrap();
+    fn execute(&mut self, graph: &mut crate::render::graph::RenderGraph, _desc: &crate::render::graph::NodeDesc, _context: &mut crate::render::graph::RenderGraphContext) {
+        let mut slot = graph.slot_value_mut(self.label.0.clone())
+            .expect(&format!("render target slot '{:?}' for PresentPass is missing", self.label.0))
+            .as_render_target_mut().unwrap();
         let surf_tex = slot.current_texture.take().unwrap();
         surf_tex.present();
     }

lyra-game/src/render/renderer.rs

@@ -125,19 +125,20 @@ impl BasicRenderer {
         let mut g = RenderGraph::new(device.clone(), queue.clone());
 
         debug!("Adding base pass");
-        g.add_pass(BasePass::new(surface, config));
+        g.add_pass(BasePassLabel, BasePass::new(surface, config));
         debug!("Adding light base pass");
-        g.add_pass(LightBasePass::new());
+        g.add_pass(LightBasePassLabel, LightBasePass::new());
         debug!("Adding light cull compute pass");
-        g.add_pass(LightCullComputePass::new(size));
+        g.add_pass(LightCullComputePassLabel, LightCullComputePass::new(size));
         //debug!("Adding triangle pass");
         //g.add_pass(TrianglePass::new());
 
         debug!("Adding mesh pass");
-        g.add_pass(MeshPass::new());
+        g.add_pass(MeshesPassLabel, MeshPass::new());
 
         debug!("Adding present pass");
-        g.add_pass(PresentPass::new(BasePassSlots::MainRenderTarget));
+        let p = PresentPass::new(BasePassSlots::MainRenderTarget);
+        g.add_pass(p.label.clone(), p);
 
         g.add_edge(BasePassLabel, LightBasePassLabel);
         g.add_edge(LightBasePassLabel, LightCullComputePassLabel);
@@ -188,7 +189,7 @@ impl Renderer for BasicRenderer {
             self.size = new_size;
             
             // update surface config and the surface
-            let mut rt = self.graph.slot_value_mut(self.graph.slot_id(&BasePassSlots::MainRenderTarget).unwrap())
+            let mut rt = self.graph.slot_value_mut(BasePassSlots::MainRenderTarget)
                 .unwrap().as_render_target_mut().unwrap();
             rt.surface_config.width = new_size.width;
             rt.surface_config.height = new_size.height;