render: create RenderTarget and Frame, making it easier to render to a non-surface texture

Cargo.toml

@@ -29,8 +29,8 @@ tracy = ["lyra-game/tracy"]
 lyra-game = { path = "lyra-game" }
 lyra-scripting = { path = "lyra-scripting", optional = true }
 
-[profile.dev]
-opt-level = 1
+#[profile.dev]
+#opt-level = 1
 
 [profile.release]
 debug = true

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

@@ -0,0 +1,100 @@
+use std::{collections::VecDeque, sync::Arc};
+
+use tracing::instrument;
+
+use super::{Frame, RenderGraphLabel, RenderGraphLabelValue, RenderTarget};
+
+/// A queued write to a GPU buffer targeting a graph slot.
+pub(crate) struct GraphBufferWrite {
+    /// The name of the slot that has the resource that will be written
+    pub(crate) target_slot: RenderGraphLabelValue,
+    pub(crate) offset: u64,
+    pub(crate) bytes: Vec<u8>,
+}
+
+#[allow(dead_code)]
+pub struct RenderGraphContext<'a> {
+    /// 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: Arc<wgpu::Device>,
+    pub queue: Arc<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: Arc<wgpu::Device>, queue: Arc<wgpu::Queue>, encoder: Option<wgpu::CommandEncoder>, label: RenderGraphLabelValue) -> Self {
+        Self {
+            encoder,
+            device,
+            queue,
+            buffer_writes: Default::default(),
+            renderpass_desc: vec![],
+            label,
+        }
+    }
+
+    pub fn begin_render_pass(
+        &'a mut self,
+        desc: wgpu::RenderPassDescriptor<'a, 'a>,
+    ) -> wgpu::RenderPass {
+        self.encoder
+            .as_mut()
+            .expect(
+                "RenderGraphContext is missing a command encoder. This is likely \
+                because you are trying to run render commands in the prepare stage.",
+            )
+            .begin_render_pass(&desc)
+    }
+
+    pub fn begin_compute_pass(&mut self, desc: &wgpu::ComputePassDescriptor) -> wgpu::ComputePass {
+        self.encoder
+            .as_mut()
+            .expect(
+                "RenderGraphContext is missing a command encoder. This is likely \
+                because you are trying to run render commands in the prepare stage.",
+            )
+            .begin_compute_pass(desc)
+    }
+
+    /// Queue a data write to a buffer at that is contained in `target_slot`.
+    ///
+    /// This does not submit the data to the GPU immediately, or add it to the `wgpu::Queue`. The
+    /// data will be submitted to the GPU queue right after the prepare stage for all passes
+    /// is ran.
+    #[instrument(skip(self, bytes), level="trace", fields(size = bytes.len()))]
+    pub fn queue_buffer_write(&mut self, target_slot: impl RenderGraphLabel, offset: u64, bytes: &[u8]) {
+        self.buffer_writes.push_back(GraphBufferWrite {
+            target_slot: target_slot.into(),
+            offset,
+            bytes: bytes.to_vec(),
+        })
+    }
+
+    /// Queue a data write of a type that  to a buffer at that is contained in `target_slot`.
+    #[instrument(skip(self, bytes), level="trace", fields(size = std::mem::size_of::<T>()))]
+    pub fn queue_buffer_write_with<T: bytemuck::NoUninit>(
+        &mut self,
+        target_slot: impl RenderGraphLabel,
+        offset: u64,
+        bytes: T,
+    ) {
+        self.queue_buffer_write(target_slot, offset, bytemuck::bytes_of(&bytes));
+    }
+
+    pub fn get_frame(&self, render_target: &RenderTarget) -> super::Frame {
+        let texture = render_target.frame_texture()
+            .expect("failed to create frame texture"); // should this be returned to the user?
+        
+        Frame {
+            device: self.device.clone(),
+            queue: self.queue.clone(),
+            texture,
+        }
+    }
+}

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

@@ -12,6 +12,12 @@ pub use passes::*;
 mod slot_desc;
 pub use slot_desc::*;
 
+mod context;
+pub use context::*;
+
+mod render_target;
+pub use render_target::*;
+
 use rustc_hash::FxHashMap;
 use tracing::{debug_span, instrument, trace, warn};
 use wgpu::ComputePass;
@@ -108,32 +114,27 @@ pub struct PipelineResource {
     pub bg_layout_name_lookup: HashMap<String, u32>,
 }
 
-#[derive(Debug)]
-pub struct RenderTarget {
-    pub surface: wgpu::Surface,
-    pub surface_config: wgpu::SurfaceConfiguration,
-    pub current_texture: Option<wgpu::SurfaceTexture>,
-}
-
 pub struct RenderGraph {
-    device: Rc<wgpu::Device>,
-    queue: Rc<wgpu::Queue>,
+    device: Arc<wgpu::Device>,
+    queue: Arc<wgpu::Queue>,
     slots: FxHashMap<RenderGraphLabelValue, ResourcedSlot>,
     nodes: FxHashMap<RenderGraphLabelValue, PassEntry>,
+    sub_graphs: FxHashMap<RenderGraphLabelValue, RenderGraph>,
     bind_groups: FxHashMap<RenderGraphLabelValue, BindGroupEntry>,
-    /// A directed graph describing the execution path of the RenderGraph
-    execution_graph: petgraph::matrix_graph::DiMatrix<RenderGraphLabelValue, (), Option<()>, usize>,
+    /// A directed graph used to determine dependencies of nodes.
+    node_graph: petgraph::matrix_graph::DiMatrix<RenderGraphLabelValue, (), Option<()>, usize>,
 }
 
 impl RenderGraph {
-    pub fn new(device: Rc<wgpu::Device>, queue: Rc<wgpu::Queue>) -> Self {
+    pub fn new(device: Arc<wgpu::Device>, queue: Arc<wgpu::Queue>) -> Self {
         Self {
             device,
             queue,
             slots: Default::default(),
             nodes: Default::default(),
+            sub_graphs: Default::default(),
             bind_groups: Default::default(),
-            execution_graph: Default::default(),
+            node_graph: Default::default(),
         }
     }
 
@@ -152,7 +153,7 @@ impl RenderGraph {
     ///     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: Node>(&mut self, label: impl RenderGraphLabel, mut pass: P) {
+    pub fn add_node<P: Node>(&mut self, label: impl RenderGraphLabel, mut pass: P) {
         let mut desc = pass.desc(self);
 
         // collect all the slots of the pass
@@ -203,7 +204,7 @@ impl RenderGraph {
         }
 
         let label: RenderGraphLabelValue = label.into();
-        let index = self.execution_graph.add_node(label.clone());
+        let index = self.node_graph.add_node(label.clone());
 
         self.nodes.insert(
             label,
@@ -239,9 +240,9 @@ impl RenderGraph {
                             .as_compute_pipeline_descriptor()
                             .expect("got render pipeline descriptor in a compute pass"),
                     )),
-                    NodeType::Presenter | NodeType::Node => {
+                    NodeType::Presenter | NodeType::Node | NodeType::Graph => {
                         panic!("Present or Node RenderGraph passes should not have a pipeline descriptor!");
-                    }
+                    },
                 };
 
                 drop(desc);
@@ -258,16 +259,27 @@ impl RenderGraph {
 
     #[instrument(skip(self, world))]
     pub fn prepare(&mut self, world: &mut World) {
-        // prepare all 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.nodes.len() / 2);
 
-        for (label, pass) in &mut self.nodes {
-            let mut context = RenderGraphContext::new(&self.device, &self.queue, None, label.clone());
-            let mut inner = pass.inner.borrow_mut();
-            inner.prepare(world, &mut context);
+        let mut sorted: VecDeque<RenderGraphLabelValue> = petgraph::algo::toposort(&self.node_graph, None)
+            .expect("RenderGraph had cycled!")
+            .iter()
+            .map(|i| self.node_graph[i.clone()].clone())
+            .collect();
+
+        while let Some(pass_label) = sorted.pop_front() {
+            let pass = self.nodes.get(&pass_label).unwrap();
+            let device = self.device.clone();
+            let queue = self.queue.clone();
+
+            let inner = pass.inner.clone();
+            let mut inner = inner.borrow_mut();
+
+            let mut context = RenderGraphContext::new(device, queue, None, pass_label.clone());
+            inner.prepare(self, world, &mut context);
             buffer_writes.append(&mut context.buffer_writes);
         }
 
@@ -296,10 +308,10 @@ impl RenderGraph {
 
     #[instrument(skip(self))]
     pub fn render(&mut self) {
-        let mut sorted: VecDeque<RenderGraphLabelValue> = petgraph::algo::toposort(&self.execution_graph, None)
+        let mut sorted: VecDeque<RenderGraphLabelValue> = petgraph::algo::toposort(&self.node_graph, None)
             .expect("RenderGraph had cycled!")
             .iter()
-            .map(|i| self.execution_graph[i.clone()].clone())
+            .map(|i| self.node_graph[i.clone()].clone())
             .collect();
         //debug!("Render graph execution order: {:?}", sorted);
 
@@ -328,7 +340,7 @@ 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, pass_label.clone());
+            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.ty == NodeType::Presenter {
@@ -412,23 +424,23 @@ impl RenderGraph {
             .iter()
             .find(|p| *p.0 == from)
             .map(|p| p.1.graph_index)
-            .expect("Failed to find from pass");
+            .expect("Failed to find from node");
         let to_idx = self
             .nodes
             .iter()
             .find(|p| *p.0 == to)
             .map(|p| p.1.graph_index)
-            .expect("Failed to find to pass");
+            .expect("Failed to find to node");
 
         debug_assert_ne!(from_idx, to_idx, "cannot add edges between the same node");
 
-        self.execution_graph.add_edge(from_idx, to_idx, ());
+        self.node_graph.add_edge(from_idx, to_idx, ());
     }
 
-    /// Utility method for setting the bind groups for a pass.
+    /// Utility method for setting the bind groups for a node.
     /// 
     /// The parameter `bind_groups` can be used to specify the labels of a bind group, and the
-    /// index of the bind group in the pipeline for the pass. If a bind group of the provided
+    /// index of the bind group in the pipeline for the node. If a bind group of the provided
     /// name is not found in the graph, a panic will occur.
     /// 
     /// # Example:
@@ -462,88 +474,33 @@ impl RenderGraph {
             pass.set_bind_group(*index, bg, &[]);
         }
     }
+
+    pub fn sub_graph_mut<L: Into<RenderGraphLabelValue>>(&mut self, label: L) -> Option<&mut RenderGraph> {
+        self.sub_graphs.get_mut(&label.into())
+    }
 }
 
-/// A queued write to a GPU buffer targeting a graph slot.
-pub(crate) struct GraphBufferWrite {
-    /// The name of the slot that has the resource that will be written
-    target_slot: RenderGraphLabelValue,
-    offset: u64,
-    bytes: Vec<u8>,
-}
+pub struct SubGraphNode(RenderGraphLabelValue);
 
-#[allow(dead_code)]
-pub struct RenderGraphContext<'a> {
-    /// 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>, label: RenderGraphLabelValue) -> Self {
-        Self {
-            encoder,
-            device,
-            queue,
-            buffer_writes: Default::default(),
-            renderpass_desc: vec![],
-            label,
-        }
+impl Node for SubGraphNode {
+    fn desc<'a, 'b>(&'a mut self, _: &'b mut RenderGraph) -> NodeDesc {
+        NodeDesc::new(NodeType::Graph, None, vec![])
     }
 
-    pub fn begin_render_pass(
-        &'a mut self,
-        desc: wgpu::RenderPassDescriptor<'a, 'a>,
-    ) -> wgpu::RenderPass {
-        self.encoder
-            .as_mut()
-            .expect(
-                "RenderGraphContext is missing a command encoder. This is likely \
-                because you are trying to run render commands in the prepare stage.",
-            )
-            .begin_render_pass(&desc)
+    fn prepare(&mut self, graph: &mut RenderGraph, world: &mut World, _: &mut RenderGraphContext) {
+        let sg = graph.sub_graph_mut(self.0.clone())
+            .unwrap_or_else(|| panic!("failed to find sub graph for SubGraphNode: {:?}", self.0));
+        sg.prepare(world);
     }
 
-    pub fn begin_compute_pass(&mut self, desc: &wgpu::ComputePassDescriptor) -> wgpu::ComputePass {
-        self.encoder
-            .as_mut()
-            .expect(
-                "RenderGraphContext is missing a command encoder. This is likely \
-                because you are trying to run render commands in the prepare stage.",
-            )
-            .begin_compute_pass(desc)
-    }
-
-    /// Queue a data write to a buffer at that is contained in `target_slot`.
-    ///
-    /// This does not submit the data to the GPU immediately, or add it to the `wgpu::Queue`. The
-    /// data will be submitted to the GPU queue right after the prepare stage for all passes
-    /// is ran.
-    #[instrument(skip(self, bytes), level="trace", fields(size = bytes.len()))]
-    pub fn queue_buffer_write(&mut self, target_slot: impl RenderGraphLabel, offset: u64, bytes: &[u8]) {
-        self.buffer_writes.push_back(GraphBufferWrite {
-            target_slot: target_slot.into(),
-            offset,
-            bytes: bytes.to_vec(),
-        })
-    }
-
-    /// Queue a data write of a type that  to a buffer at that is contained in `target_slot`.
-    #[instrument(skip(self, bytes), level="trace", fields(size = std::mem::size_of::<T>()))]
-    pub fn queue_buffer_write_with<T: bytemuck::NoUninit>(
+    fn execute(
         &mut self,
-        target_slot: impl RenderGraphLabel,
-        offset: u64,
-        bytes: T,
+        graph: &mut RenderGraph,
+        _: &NodeDesc,
+        _: &mut RenderGraphContext,
     ) {
-        self.queue_buffer_write(target_slot, offset, bytemuck::bytes_of(&bytes));
+        let sg = graph.sub_graph_mut(self.0.clone())
+            .unwrap_or_else(|| panic!("failed to find sub graph for SubGraphNode: {:?}", self.0));
+        sg.render();
     }
 }

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

@@ -5,7 +5,7 @@ use lyra_ecs::World;
 
 use crate::render::resource::PipelineDescriptor;
 
-use super::{RenderGraph, RenderGraphContext, RenderGraphLabel, RenderGraphLabelValue, RenderTarget};
+use super::{Frame, RenderGraph, RenderGraphContext, RenderGraphLabel, RenderGraphLabelValue, RenderTarget};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Default)]
 pub enum NodeType {
@@ -18,6 +18,8 @@ pub enum NodeType {
     Render,
     /// A node that presents render results to a render target.
     Presenter,
+    /// A node that represents a sub-graph.
+    Graph,
 }
 
 impl NodeType {
@@ -28,6 +30,7 @@ impl NodeType {
             NodeType::Compute => true,
             NodeType::Render => true,
             NodeType::Presenter => false,
+            NodeType::Graph => false,
         }
     }
 }
@@ -40,10 +43,11 @@ pub enum SlotType {
     Texture,
     Buffer,
     RenderTarget,
+    Frame,
 }
 
 /// The value of a slot in a [`Node`].
-#[derive(Debug, Clone)]
+#[derive(Clone)]
 pub enum SlotValue {
     /// This slot doesn't have any value
     None,
@@ -55,6 +59,7 @@ pub enum SlotValue {
     Texture(Rc<wgpu::Texture>),
     Buffer(Rc<wgpu::Buffer>),
     RenderTarget(Rc<RefCell<RenderTarget>>),
+    Frame(Rc<RefCell<Option<Frame>>>),
 }
 
 impl SlotValue {
@@ -81,6 +86,14 @@ impl SlotValue {
     pub fn as_render_target_mut(&mut self) -> Option<RefMut<RenderTarget>> {
         bind_match!(self, Self::RenderTarget(v) => v.borrow_mut())
     }
+
+    pub fn as_frame(&self) -> Option<Ref<Option<Frame>>> {
+        bind_match!(self, Self::Frame(v) => v.borrow())
+    }
+
+    pub fn as_frame_mut(&mut self) -> Option<RefMut<Option<Frame>>> {
+        bind_match!(self, Self::Frame(v) => v.borrow_mut())
+    }
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
 pub enum SlotAttribute {
@@ -348,7 +361,7 @@ pub trait Node: 'static {
     /// 
     /// 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);
+    fn prepare(&mut self, graph: &mut RenderGraph, world: &mut World, context: &mut RenderGraphContext);
     
     /// Execute the node.
     /// 

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

@@ -1,6 +1,5 @@
 use std::{cell::RefCell, rc::Rc};
 
-use glam::UVec2;
 use lyra_game_derive::RenderGraphLabel;
 use tracing::warn;
 use winit::dpi::PhysicalSize;
@@ -9,8 +8,7 @@ use crate::{
     render::{
         camera::{CameraUniform, RenderCamera},
         graph::{
-            RenderGraphContext, Node, NodeDesc, NodeSlot,
-            NodeType, RenderTarget, SlotAttribute, SlotType, SlotValue,
+            Node, NodeDesc, NodeSlot, NodeType, RenderGraph, RenderGraphContext, RenderTarget, SlotAttribute, SlotType, SlotValue
         },
         render_buffer::BufferWrapper, texture::RenderTexture,
     },
@@ -28,6 +26,7 @@ pub enum BasePassSlots {
     MainRenderTarget,
     WindowTextureView,
     DepthTextureView,
+    Frame,
 }
 
 /// Supplies some basic things other passes needs.
@@ -44,15 +43,11 @@ pub struct BasePass {
 }
 
 impl BasePass {
-    pub fn new(surface: wgpu::Surface, surface_config: wgpu::SurfaceConfiguration) -> Self {
-        let size = glam::UVec2::new(surface_config.width, surface_config.height);
+    pub fn new(render_target: RenderTarget) -> Self {
+        let size = render_target.size();
 
         Self {
-            temp_render_target: Some(RenderTarget {
-                surface,
-                surface_config,
-                current_texture: None,
-            }),
+            temp_render_target: Some(render_target),
             screen_size: size,
             ..Default::default()
         }
@@ -65,10 +60,7 @@ impl Node for BasePass {
         graph: &mut crate::render::graph::RenderGraph,
     ) -> crate::render::graph::NodeDesc {
         let render_target = self.temp_render_target.take().unwrap();
-        self.screen_size = UVec2::new(
-            render_target.surface_config.width,
-            render_target.surface_config.height,
-        );
+        self.screen_size = render_target.size();
 
         let (screen_size_bgl, screen_size_bg, screen_size_buf, _) = BufferWrapper::builder()
             .buffer_usage(wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST)
@@ -91,7 +83,7 @@ impl Node for BasePass {
         let camera_bg = Rc::new(camera_bg);
 
         // create the depth texture using the utility struct, then take all the required fields
-        let mut depth_texture = RenderTexture::create_depth_texture(&graph.device(), &render_target.surface_config, "depth_texture");
+        let mut depth_texture = RenderTexture::create_depth_texture(&graph.device(), self.screen_size, "depth_texture");
         depth_texture.create_bind_group(&graph.device);
 
         let dt_bg_pair = depth_texture.bindgroup_pair.unwrap();
@@ -123,6 +115,12 @@ impl Node for BasePass {
                 render_target,
             )))),
         });
+        desc.add_slot(NodeSlot {
+            ty: SlotType::Frame,
+            attribute: SlotAttribute::Output,
+            label: BasePassSlots::Frame.into(),
+            value: Some(SlotValue::Lazy),
+        });
         desc.add_texture_view_slot(
             BasePassSlots::WindowTextureView,
             SlotAttribute::Output,
@@ -147,7 +145,7 @@ impl Node for BasePass {
         desc
     }
 
-    fn prepare(&mut self, world: &mut lyra_ecs::World, context: &mut RenderGraphContext) {
+    fn prepare(&mut self, _graph: &mut RenderGraph, world: &mut lyra_ecs::World, context: &mut RenderGraphContext) {
         if let Some(camera) = world.view_iter::<&mut CameraComponent>().next() {
             let mut render_cam =
                 RenderCamera::new(PhysicalSize::new(self.screen_size.x, self.screen_size.y));
@@ -168,28 +166,31 @@ impl Node for BasePass {
         let tv_slot = graph
             .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!(
+        let rt = tv_slot.as_render_target().unwrap();
+        let rt_size = rt.size();
+        let frame = context.get_frame(&rt);
+        /* debug_assert!(
             !rt.current_texture.is_some(),
             "main render target surface was not presented!"
-        );
+        ); */
 
         // update the screen size buffer if the size changed.
-        if rt.surface_config.width != self.screen_size.x
-            || rt.surface_config.height != self.screen_size.y
-        {
-            self.screen_size = UVec2::new(rt.surface_config.width, rt.surface_config.height);
+        if rt_size != self.screen_size {
+            self.screen_size = rt_size;
             context.queue_buffer_write_with(BasePassSlots::ScreenSize, 0, self.screen_size)
         }
 
-        let surface_tex = rt.surface.get_current_texture().unwrap();
+        let surface_tex = frame.texture();
         let view = surface_tex
-            .texture
             .create_view(&wgpu::TextureViewDescriptor::default());
 
-        rt.current_texture = Some(surface_tex);
         drop(rt); // must be manually dropped for borrow checker when getting texture view slot
 
+        let frame_slot = graph
+            .slot_value_mut(BasePassSlots::Frame)
+            .expect("somehow the frame slot is missing");
+        *frame_slot = SlotValue::Frame(Rc::new(RefCell::new(Some(frame))));
+
         // store the surface texture to the slot
         let tv_slot = graph
             .slot_value_mut(BasePassSlots::WindowTextureView)

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

@@ -0,0 +1,33 @@
+use lyra_game_derive::RenderGraphLabel;
+
+use crate::render::graph::{Node, NodeDesc, NodeSlot, NodeType};
+
+#[derive(Debug, Default, Clone, Copy, Hash, RenderGraphLabel)]
+pub struct InitNodeLabel;
+
+pub struct InitNode {
+    slots: Vec<NodeSlot>,
+}
+
+impl Node for InitNode {
+    fn desc<'a, 'b>(&'a mut self, _: &'b mut crate::render::graph::RenderGraph) -> crate::render::graph::NodeDesc {
+        let mut desc = NodeDesc::new(NodeType::Node, None, vec![]);
+        // the slots can just be cloned since the slot attribute doesn't really matter much.
+        desc.slots = self.slots.clone();
+
+        desc
+    }
+
+    fn prepare(&mut self, _: &mut crate::render::graph::RenderGraph, _: &mut lyra_ecs::World, _: &mut crate::render::graph::RenderGraphContext) {
+        
+    }
+
+    fn execute(
+        &mut self,
+        _: &mut crate::render::graph::RenderGraph,
+        _: &crate::render::graph::NodeDesc,
+        _: &mut crate::render::graph::RenderGraphContext,
+    ) {
+        
+    }
+}

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

@@ -2,8 +2,7 @@ use lyra_game_derive::RenderGraphLabel;
 
 use crate::render::{
     graph::{
-        RenderGraphContext, Node, NodeDesc, NodeType, SlotAttribute,
-        SlotValue,
+        Node, NodeDesc, NodeType, RenderGraph, RenderGraphContext, SlotAttribute, SlotValue
     },
     light::LightUniformBuffers,
 };
@@ -58,10 +57,10 @@ impl Node for LightBasePass {
         desc
     }
 
-    fn prepare(&mut self, world: &mut lyra_ecs::World, context: &mut RenderGraphContext) {
+    fn prepare(&mut self, _graph: &mut RenderGraph, world: &mut lyra_ecs::World, context: &mut RenderGraphContext) {
         let tick = world.current_tick();
         let lights = self.light_buffers.as_mut().unwrap();
-        lights.update_lights(context.queue, tick, world);
+        lights.update_lights(&context.queue, tick, world);
     }
 
     fn execute(

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

@@ -7,7 +7,7 @@ use wgpu::util::DeviceExt;
 
 use crate::render::{
     graph::{
-        Node, NodeDesc, NodeType, RenderGraphContext, SlotAttribute, SlotValue
+        Node, NodeDesc, NodeType, RenderGraph, RenderGraphContext, SlotAttribute, SlotValue
     }, renderer::ScreenSize, resource::{ComputePipelineDescriptor, PipelineDescriptor, Shader}
 };
 
@@ -51,8 +51,7 @@ impl Node for LightCullComputePass {
             .slot_value(BasePassSlots::MainRenderTarget)
             .and_then(|s| s.as_render_target())
             .expect("missing main render target");
-        self.workgroup_size =
-            glam::UVec2::new(main_rt.surface_config.width, main_rt.surface_config.height);
+        self.workgroup_size = main_rt.size();
 
         // initialize some buffers with empty data
         let mut contents = Vec::<u8>::new();
@@ -215,7 +214,7 @@ impl Node for LightCullComputePass {
         desc
     }
 
-    fn prepare(&mut self, world: &mut World, context: &mut RenderGraphContext) {
+    fn prepare(&mut self, _graph: &mut RenderGraph, world: &mut World, context: &mut RenderGraphContext) {
         context.queue_buffer_write_with(LightCullComputePassSlots::IndexCounterBuffer, 0, 0);
 
         let screen_size  = world.get_resource::<ScreenSize>();

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

@@ -15,8 +15,7 @@ use wgpu::util::DeviceExt;
 use crate::{
     render::{
         desc_buf_lay::DescVertexBufferLayout, graph::{
-            RenderGraphContext, Node, NodeDesc,
-            NodeType,
+            Node, NodeDesc, NodeType, RenderGraph, RenderGraphContext
         }, 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,
@@ -235,7 +234,7 @@ impl Node for MeshPass {
         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;
+        let surface_config_format = main_rt.format();
         drop(main_rt);
 
         let camera_bgl = graph.bind_group_layout(BasePassSlots::Camera);
@@ -297,10 +296,10 @@ impl Node for MeshPass {
         desc
     }
 
-    #[instrument(skip(self, world, context))]
-    fn prepare(&mut self, world: &mut lyra_ecs::World, context: &mut RenderGraphContext) {
-        let device = context.device;
-        let queue = context.queue;
+    #[instrument(skip(self, _graph, world, context))]
+    fn prepare(&mut self, _graph: &mut RenderGraph, world: &mut lyra_ecs::World, context: &mut RenderGraphContext) {
+        let device = &context.device;
+        let queue = &context.queue;
         let render_limits = device.limits();
 
         let last_epoch = world.current_tick();
@@ -364,7 +363,7 @@ impl Node for MeshPass {
                 let transforms = self.transforms.as_mut().unwrap();
                 if transforms.needs_expand() {
                     debug!("Expanding transform buffers");
-                    transforms.expand_buffers(device);
+                    transforms.expand_buffers(&device);
                 }
             }
 
@@ -373,14 +372,14 @@ impl Node for MeshPass {
                     // if process mesh did not just create a new mesh, and the epoch
                     // shows that the scene has changed, verify that the mesh buffers
                     // dont need to be resent to the gpu.
-                    if !self.process_mesh(device, queue, entity, &*mesh, mesh_han.uuid())
+                    if !self.process_mesh(&device, &queue, entity, &*mesh, mesh_han.uuid())
                             && mesh_epoch == last_epoch {
-                        self.check_mesh_buffers(device, queue, &mesh_han);
+                        self.check_mesh_buffers(&device, &queue, &mesh_han);
                     }
                     
                     let transforms = self.transforms.as_mut().unwrap();
                     let group = TransformGroup::EntityRes(entity, mesh_han.uuid());
-                    let transform_id = transforms.update_or_push(device, queue, &render_limits,
+                    let transform_id = transforms.update_or_push(&device, &queue, &render_limits,
                         group, interp_transform.calculate_mat4(), glam::Mat3::from_quat(interp_transform.rotation));
 
                     let material = mesh.material.as_ref().unwrap()
@@ -405,15 +404,15 @@ impl Node for MeshPass {
                             // if process mesh did not just create a new mesh, and the epoch
                             // shows that the scene has changed, verify that the mesh buffers
                             // dont need to be resent to the gpu.
-                            if !self.process_mesh(device, queue, entity, &*mesh, mesh_han.uuid())
+                            if !self.process_mesh(&device, &queue, entity, &*mesh, mesh_han.uuid())
                                     && scene_epoch == last_epoch {
-                                self.check_mesh_buffers(device, queue, &mesh_han);
+                                self.check_mesh_buffers(&device, &queue, &mesh_han);
                             }
 
                             let transforms = self.transforms.as_mut().unwrap();
                             let scene_mesh_group = TransformGroup::Res(scene_han.uuid(), mesh_han.uuid());
                             let group = TransformGroup::OwnedGroup(entity, scene_mesh_group.into());
-                            let transform_id = transforms.update_or_push(device, queue, &render_limits,
+                            let transform_id = transforms.update_or_push(&device, &queue, &render_limits,
                                 group, mesh_interpo.calculate_mat4(), glam::Mat3::from_quat(mesh_interpo.rotation) );
                             
                             let material = mesh.material.as_ref().unwrap()
@@ -432,7 +431,7 @@ impl Node for MeshPass {
         }
 
         let transforms = self.transforms.as_mut().unwrap();
-        transforms.send_to_gpu(queue);
+        transforms.send_to_gpu(&queue);
     }
 
     fn execute(

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

@@ -11,4 +11,7 @@ mod light_base;
 pub use light_base::*;
 
 mod present_pass;
-pub use present_pass::*;
+pub use present_pass::*;
+
+mod init;
+pub use init::*;

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

@@ -2,14 +2,14 @@ use std::hash::Hash;
 
 use lyra_game_derive::RenderGraphLabel;
 
-use crate::render::graph::{RenderGraphContext, RenderGraphLabel, RenderGraphLabelValue, Node, NodeDesc, NodeSlot, NodeType, SlotAttribute, SlotType};
+use crate::render::graph::{Node, NodeDesc, NodeSlot, NodeType, RenderGraph, RenderGraphContext, RenderGraphLabel, RenderGraphLabelValue, SlotAttribute, SlotType};
 
 #[derive(Debug, Clone, Hash, PartialEq, RenderGraphLabel)]
 pub struct PresentPassLabel(RenderGraphLabelValue);
 
 impl PresentPassLabel {
-    pub fn new(label: impl RenderGraphLabel) -> Self {
-        Self(label.into())
+    pub fn new(frame_label: impl RenderGraphLabel) -> Self {
+        Self(frame_label.into())
     }
 }
 
@@ -22,10 +22,17 @@ pub struct PresentPass {
 }
 
 impl PresentPass {
-    pub fn new(render_target_slot: impl RenderGraphLabel) -> Self {
+    /// Create a new PresentNode, presenting the frame at `frame_label`
+    pub fn new(frame_label: impl RenderGraphLabel) -> Self {
         Self {
             //render_target_slot: render_target_slot.rc_clone(),
-            label: PresentPassLabel::new(render_target_slot),
+            label: PresentPassLabel::new(frame_label),
+        }
+    }
+
+    pub fn from_node_label(present_pass_label: PresentPassLabel) -> Self {
+        Self {
+            label: present_pass_label,
         }
     }
 }
@@ -40,7 +47,7 @@ impl Node for PresentPass {
 
         desc.add_slot(
             NodeSlot {
-                ty: SlotType::RenderTarget,
+                ty: SlotType::Frame,
                 attribute: SlotAttribute::Input,
                 label: self.label.0.clone(),
                 value: None,
@@ -50,15 +57,17 @@ impl Node for PresentPass {
         desc
     }
 
-    fn prepare(&mut self, _world: &mut lyra_ecs::World, _context: &mut RenderGraphContext) {
+    fn prepare(&mut self, _graph: &mut RenderGraph, _world: &mut lyra_ecs::World, _context: &mut RenderGraphContext) {
         
     }
 
     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();
+        let slot = graph.slot_value_mut(self.label.0.clone())
+            .unwrap_or_else(|| panic!("frame slot '{:?}' for PresentPass is missing", self.label.0))
+            .as_frame_mut()
+            .unwrap()
+            .take()
+            .unwrap_or_else(|| panic!("frame '{:?}' was already presented", self.label.0));
+        slot.present();
     }
 }

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

@@ -0,0 +1,102 @@
+use std::sync::Arc;
+
+use crate::math;
+
+enum RenderTargetInner {
+    Surface {
+        surface: wgpu::Surface,
+        config: wgpu::SurfaceConfiguration,
+    },
+    Texture {
+        texture: Arc<wgpu::Texture>,
+    }
+}
+
+/// A render target that is a surface or a texture.
+#[repr(transparent)]
+pub struct RenderTarget(RenderTargetInner);
+
+impl From<wgpu::Texture> for RenderTarget {
+    fn from(value: wgpu::Texture) -> Self {
+        Self(RenderTargetInner::Texture { texture: Arc::new(value) })
+    }
+}
+
+impl RenderTarget {
+    pub fn from_surface(surface: wgpu::Surface, config: wgpu::SurfaceConfiguration) -> Self {
+        Self(RenderTargetInner::Surface { surface, config })
+    }
+
+    pub fn format(&self) -> wgpu::TextureFormat {
+        match &self.0 {
+            RenderTargetInner::Surface { config, .. } => config.format,
+            RenderTargetInner::Texture { texture } => texture.format(),
+        }
+    }
+
+    pub fn size(&self) -> math::UVec2 {
+        match &self.0 {
+            RenderTargetInner::Surface { config, .. } => math::UVec2::new(config.width, config.height),
+            RenderTargetInner::Texture { texture } => {
+                let s = texture.size();
+                math::UVec2::new(s.width, s.height)
+            },
+        }
+    }
+
+    /// Get the frame texture of the [`RenderTarget`]
+    /// 
+    /// If this is target is a surface and the frame texture was already retrieved from the swap
+    /// chain, a [`wgpu::SurfaceError`] error will be returned.
+    pub fn frame_texture(&self) -> Result<FrameTexture, wgpu::SurfaceError> {
+        match &self.0 {
+            RenderTargetInner::Surface { surface, .. } => Ok(FrameTexture::Surface(surface.get_current_texture()?)),
+            RenderTargetInner::Texture { texture } => Ok(FrameTexture::Texture(texture.clone())),
+        }
+    }
+
+    pub fn resize(&mut self, device: &wgpu::Device, new_size: math::UVec2) {
+        match &mut self.0 {
+            RenderTargetInner::Surface { surface, config } => {
+                config.width = new_size.x;
+                config.height = new_size.y;
+                surface.configure(device, config);
+            },
+            RenderTargetInner::Texture { texture } => {
+                let _ = texture;
+                todo!()
+            },
+        }
+    }
+}
+
+pub enum FrameTexture {
+    Surface(wgpu::SurfaceTexture),
+    Texture(Arc<wgpu::Texture>),
+}
+
+#[allow(dead_code)]
+pub struct Frame {
+    pub(crate) device: Arc<wgpu::Device>,
+    pub(crate) queue: Arc<wgpu::Queue>,
+    pub(crate) texture: FrameTexture,
+}
+
+impl Frame {
+    pub fn texture(&self) -> &wgpu::Texture {
+        match &self.texture {
+            FrameTexture::Surface(s) => &s.texture,
+            FrameTexture::Texture(t) => t,
+        }
+    }
+
+    /// Present the frame
+    /// 
+    /// If this frame is from a surface, it will be present, else nothing will happen.
+    pub fn present(self) {
+        match self.texture {
+            FrameTexture::Surface(s) => s.present(),
+            FrameTexture::Texture(_) => {},
+        }
+    }
+}

lyra-game/src/render/light_cull_compute.rs

@@ -17,8 +17,8 @@ pub(crate) struct LightIndicesGridBuffer {
 }
 
 pub(crate) struct LightCullCompute {
-    device: Rc<wgpu::Device>,
-    queue: Rc<wgpu::Queue>,
+    device: Arc<wgpu::Device>,
+    queue: Arc<wgpu::Queue>,
     pipeline: ComputePipeline,
     pub light_indices_grid: LightIndicesGridBuffer,
     screen_size_buffer: BufferWrapper,
@@ -153,7 +153,7 @@ impl LightCullCompute {
         }
     }
 
-    pub fn new(device: Rc<wgpu::Device>, queue: Rc<wgpu::Queue>, screen_size: PhysicalSize<u32>, lights_buffers: &LightUniformBuffers, camera_buffers: &BufferWrapper, depth_texture: &mut RenderTexture) -> Self {
+    pub fn new(device: Arc<wgpu::Device>, queue: Arc<wgpu::Queue>, screen_size: PhysicalSize<u32>, lights_buffers: &LightUniformBuffers, camera_buffers: &BufferWrapper, depth_texture: &mut RenderTexture) -> Self {
         let screen_size_buffer = BufferWrapper::builder()
             .buffer_usage(wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST)
             .label_prefix("ScreenSize")

lyra-game/src/render/renderer.rs

@@ -1,17 +1,18 @@
 use std::collections::VecDeque;
 use std::ops::{Deref, DerefMut};
-use std::rc::Rc;
 use std::sync::Arc;
 
 use lyra_ecs::World;
 use tracing::{debug, instrument, warn};
 use winit::window::Window;
 
-use crate::render::graph::{BasePass, BasePassLabel, BasePassSlots, LightBasePass, LightBasePassLabel, LightCullComputePass, LightCullComputePassLabel, MeshPass, MeshesPassLabel, PresentPass, PresentPassLabel};
+use crate::render::graph::{BasePass, BasePassLabel, BasePassSlots, LightBasePass, LightBasePassLabel, LightCullComputePass, LightCullComputePassLabel, MeshPass, MeshesPassLabel, PresentPass, PresentPassLabel, RenderTarget};
 
 use super::graph::RenderGraph;
 use super::{resource::RenderPipeline, render_job::RenderJob};
 
+use crate::math;
+
 #[derive(Clone, Copy, Debug)]
 pub struct ScreenSize(glam::UVec2);
 
@@ -45,8 +46,8 @@ pub trait RenderPass {
 }
 
 pub struct BasicRenderer {
-    pub device: Rc<wgpu::Device>, // device does not need to be mutable, no need for refcell
-    pub queue: Rc<wgpu::Queue>,
+    pub device: Arc<wgpu::Device>, // device does not need to be mutable, no need for refcell
+    pub queue: Arc<wgpu::Queue>,
     pub size: winit::dpi::PhysicalSize<u32>,
     pub window: Arc<Window>,
 
@@ -119,35 +120,38 @@ impl BasicRenderer {
         };
         surface.configure(&device, &config);
 
-        let device = Rc::new(device);
-        let queue = Rc::new(queue);
+        let device = Arc::new(device);
+        let queue = Arc::new(queue);
 
         let mut g = RenderGraph::new(device.clone(), queue.clone());
 
+        let surface_target = RenderTarget::from_surface(surface, config);
+
         debug!("Adding base pass");
-        g.add_pass(BasePassLabel, BasePass::new(surface, config));
+        g.add_node(BasePassLabel, BasePass::new(surface_target));
         debug!("Adding light base pass");
-        g.add_pass(LightBasePassLabel, LightBasePass::new());
+        g.add_node(LightBasePassLabel, LightBasePass::new());
         debug!("Adding light cull compute pass");
-        g.add_pass(LightCullComputePassLabel, LightCullComputePass::new(size));
+        g.add_node(LightCullComputePassLabel, LightCullComputePass::new(size));
         //debug!("Adding triangle pass");
-        //g.add_pass(TrianglePass::new());
+        //g.add_node(TrianglePass::new());
 
         debug!("Adding mesh pass");
-        g.add_pass(MeshesPassLabel, MeshPass::new());
+        g.add_node(MeshesPassLabel, MeshPass::new());
 
         debug!("Adding present pass");
-        let p = PresentPass::new(BasePassSlots::MainRenderTarget);
-        g.add_pass(p.label.clone(), p);
+        let present_pass_label = PresentPassLabel::new(BasePassSlots::Frame);
+        let p = PresentPass::from_node_label(present_pass_label.clone());
+        g.add_node(p.label.clone(), p);
 
         g.add_edge(BasePassLabel, LightBasePassLabel);
         g.add_edge(LightBasePassLabel, LightCullComputePassLabel);
         g.add_edge(BasePassLabel, MeshesPassLabel);
 
         // make sure that present runs last
-        g.add_edge(BasePassLabel, PresentPassLabel::new(BasePassSlots::MainRenderTarget));
-        g.add_edge(LightCullComputePassLabel, PresentPassLabel::new(BasePassSlots::MainRenderTarget));
-        g.add_edge(MeshesPassLabel, PresentPassLabel::new(BasePassSlots::MainRenderTarget));
+        g.add_edge(BasePassLabel, present_pass_label.clone());
+        g.add_edge(LightCullComputePassLabel, present_pass_label.clone());
+        g.add_edge(MeshesPassLabel, present_pass_label.clone());
 
         g.setup(&device);
 
@@ -191,9 +195,10 @@ impl Renderer for BasicRenderer {
             // update surface config and the surface
             let mut rt = self.graph.slot_value_mut(BasePassSlots::MainRenderTarget)
                 .unwrap().as_render_target_mut().unwrap();
-            rt.surface_config.width = new_size.width;
+            rt.resize(&self.device, math::UVec2::new(new_size.width, new_size.height));
+            /* rt.surface_config.width = new_size.width;
             rt.surface_config.height = new_size.height;
-            rt.surface.configure(&self.device, &rt.surface_config);
+            rt.surface.configure(&self.device, &rt.surface_config); */
 
             // update screen size resource in ecs
             let mut world_ss = world.get_resource_mut::<ScreenSize>();

lyra-game/src/render/texture.rs

@@ -254,10 +254,10 @@ impl RenderTexture {
         );
     }
 
-    pub fn create_depth_texture(device: &wgpu::Device, config: &wgpu::SurfaceConfiguration, label: &str) -> Self {
+    pub fn create_depth_texture(device: &wgpu::Device, size: crate::math::UVec2, label: &str) -> Self {
         let size = wgpu::Extent3d {
-            width: config.width,
-            height: config.height,
+            width: size.x,
+            height: size.y,
             depth_or_array_layers: 1,
         };
         let desc = wgpu::TextureDescriptor {