commit dbad5cebd3c6842ccc3b88b4496a53e3b6056b1e
Author: mars <mars@tebibyte.media>
Date:   Sun Apr 3 20:11:38 2022 -0600

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..96ef6c0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..c9dff52
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "cyborg"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+strum = { version = "0.24", features = ["derive"] }
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..f80e21b
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,208 @@
+//! Cyborg is a high-performance, modern, experimental rendering engine written
+//! in Rust.
+
+use std::collections::HashMap;
+use std::sync::{Arc, RwLock};
+use strum::IntoEnumIterator;
+
+#[derive(Copy, Clone, Debug, Hash, Eq, Ord, PartialEq, PartialOrd, strum::EnumIter)]
+pub enum PrePhase {}
+
+#[derive(Copy, Clone, Debug, Hash, Eq, Ord, PartialEq, PartialOrd, strum::EnumIter)]
+pub enum ViewportPhase {}
+
+#[derive(Debug, Default)]
+pub struct PhaseList {
+    pub pre: Vec<PrePhase>,
+    pub viewport: Vec<ViewportPhase>,
+}
+
+impl PhaseList {
+    pub fn clear(&mut self) {
+        self.pre.clear();
+        self.viewport.clear();
+    }
+}
+
+#[derive(Debug, Default)]
+pub struct PhaseMultiMap<T> {
+    pub pre: HashMap<PrePhase, Vec<T>>,
+    pub viewport: HashMap<ViewportPhase, Vec<T>>,
+}
+
+impl<T: Copy + PartialEq> PhaseMultiMap<T> {
+    pub fn insert_multi(&mut self, keys: &PhaseList, val: T) {
+        for pre in keys.pre.iter() {
+            Self::insert(&mut self.pre, pre, val);
+        }
+
+        for viewport in keys.viewport.iter() {
+            Self::insert(&mut self.viewport, viewport, val);
+        }
+    }
+
+    pub fn iter_pre<'a>(&'a self, phase: &'a PrePhase) -> std::slice::Iter<'a, T> {
+        Self::iter(&self.pre, phase)
+    }
+
+    pub fn iter_viewport<'a>(&'a self, phase: &'a ViewportPhase) -> std::slice::Iter<'a, T> {
+        Self::iter(&self.viewport, phase)
+    }
+
+    fn insert<K>(map: &mut HashMap<K, Vec<T>>, key: &K, val: T)
+    where
+        K: std::hash::Hash + Eq + Copy,
+    {
+        if let Some(existing) = map.get_mut(key) {
+            if !existing.contains(&val) {
+                existing.push(val);
+            }
+        } else {
+            map.insert(*key, vec![val]);
+        }
+    }
+
+    fn iter<'a, K>(map: &'a HashMap<K, Vec<T>>, key: &'a K) -> std::slice::Iter<'a, T>
+    where
+        K: std::hash::Hash + Eq + Copy,
+    {
+        if let Some(vals) = map.get(key) {
+            vals.iter()
+        } else {
+            [].iter()
+        }
+    }
+}
+
+pub struct ViewportData;
+
+pub trait FrameData {}
+
+pub trait RenderPass {
+    type FrameData: FrameData;
+
+    fn create_frame_data(&mut self) -> Self::FrameData;
+
+    fn begin_frame(&mut self, data: &mut Self::FrameData, phases: &mut PhaseList);
+
+    fn render_pre(
+        &self,
+        phase: PrePhase,
+        data: &Self::FrameData,
+        cmds: &mut gpu::RenderBundleEncoder,
+    );
+
+    fn render_viewport(
+        &self,
+        phase: ViewportPhase,
+        data: &Self::FrameData,
+        viewport: &ViewportData,
+        cmds: &mut gpu::RenderBundleEncoder,
+    );
+}
+
+pub struct Renderer {
+    pub render_passes: Vec<Box<dyn RenderPassBoxTrait>>,
+}
+
+impl Renderer {
+    pub fn render(&mut self) {
+        let frame_index = 0;
+
+        let mut phase_passes = PhaseMultiMap::<usize>::default();
+
+        let mut phases_buf = PhaseList::default();
+        for (pass_index, rp) in self.render_passes.iter_mut().enumerate() {
+            phases_buf.clear();
+            rp.begin_frame(frame_index, &mut phases_buf);
+            phase_passes.insert_multi(&phases_buf, pass_index);
+        }
+
+        for phase in PrePhase::iter() {
+            for pass_index in phase_passes.iter_pre(&phase) {
+                let pass = &self.render_passes[*pass_index];
+                let mut encoder = gpu::RenderBundleEncoder;
+                pass.render_pre(phase, frame_index, &mut encoder);
+            }
+        }
+
+        let viewport = ViewportData;
+
+        for phase in ViewportPhase::iter() {
+            for pass_index in phase_passes.iter_viewport(&phase) {
+                let pass = &self.render_passes[*pass_index];
+                let mut encoder = gpu::RenderBundleEncoder;
+                pass.render_viewport(phase, frame_index, &viewport, &mut encoder);
+            }
+        }
+    }
+}
+
+pub trait RenderPassBoxTrait {
+    fn begin_frame(&mut self, data_index: usize, phases: &mut PhaseList);
+
+    fn render_pre(&self, phase: PrePhase, data_index: usize, cmds: &mut gpu::RenderBundleEncoder);
+
+    fn render_viewport(
+        &self,
+        phase: ViewportPhase,
+        data_index: usize,
+        viewport: &ViewportData,
+        cmds: &mut gpu::RenderBundleEncoder,
+    );
+}
+
+pub struct RenderPassBox<T: RenderPass> {
+    render_pass: Arc<RwLock<T>>,
+    frame_data: Vec<T::FrameData>,
+}
+
+impl<T: RenderPass> RenderPassBox<T> {
+    pub fn new(render_pass: Arc<RwLock<T>>, frame_num: usize) -> Self {
+        let frame_data = {
+            let mut lock = render_pass.write().unwrap();
+            (0..frame_num).map(|_| lock.create_frame_data()).collect()
+        };
+
+        Self {
+            render_pass,
+            frame_data,
+        }
+    }
+}
+
+impl<T: RenderPass> RenderPassBoxTrait for RenderPassBox<T> {
+    fn begin_frame(&mut self, data_index: usize, phases: &mut PhaseList) {
+        let frame_data = &mut self.frame_data[data_index];
+        let mut render_pass = self.render_pass.write().unwrap();
+        render_pass.begin_frame(frame_data, phases)
+    }
+
+    fn render_pre(&self, phase: PrePhase, data_index: usize, cmds: &mut gpu::RenderBundleEncoder) {
+        let frame_data = &self.frame_data[data_index];
+        let render_pass = self.render_pass.read().unwrap();
+        render_pass.render_pre(phase, frame_data, cmds)
+    }
+
+    fn render_viewport(
+        &self,
+        phase: ViewportPhase,
+        data_index: usize,
+        viewport: &ViewportData,
+        cmds: &mut gpu::RenderBundleEncoder,
+    ) {
+        let frame_data = &self.frame_data[data_index];
+        let render_pass = self.render_pass.read().unwrap();
+        render_pass.render_viewport(phase, frame_data, viewport, cmds)
+    }
+}
+
+/// Mock GPU API (like Vulkan, WebGPU, or OpenGL) types for prototyping.
+pub mod gpu {
+    /// Thread-safe GPU command recorder that's later executed in a command buffer.
+    ///
+    /// Also known as a:
+    /// - RenderBundleEncoder in WebGPU
+    /// - secondary command buffer in Vulkan
+    pub struct RenderBundleEncoder;
+}