From a7a4fc82ac83be4161a0ad846f0f542c8ede866e Mon Sep 17 00:00:00 2001
From: mars <mars@tebibyte.media>
Date: Sat, 14 May 2022 17:28:37 -0600
Subject: [PATCH] Editor winit + wgpu rendering hello world

---
 editor/Cargo.toml  |   4 ++
 editor/src/main.rs | 126 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 128 insertions(+), 2 deletions(-)

diff --git a/editor/Cargo.toml b/editor/Cargo.toml
index c3cb724..fbbc268 100644
--- a/editor/Cargo.toml
+++ b/editor/Cargo.toml
@@ -5,3 +5,7 @@ edition = "2021"
 
 [dependencies]
 cyborg = { path = "../" }
+egui = "0.17.0"
+egui-winit = "0.17.0"
+egui_wgpu_backend = "0.17.0"
+pollster = "0.2"
diff --git a/editor/src/main.rs b/editor/src/main.rs
index e7a11a9..a984534 100644
--- a/editor/src/main.rs
+++ b/editor/src/main.rs
@@ -1,3 +1,125 @@
-fn main() {
-    println!("Hello, world!");
+use egui_wgpu_backend::wgpu;
+use egui_winit::winit::{
+    self,
+    event::{Event, WindowEvent},
+    event_loop::{ControlFlow, EventLoop},
+    window::WindowBuilder,
+};
+
+async fn get_device(
+    window: &winit::window::Window,
+) -> (
+    wgpu::Device,
+    wgpu::Queue,
+    wgpu::Surface,
+    wgpu::SurfaceConfiguration,
+) {
+    let size = window.inner_size();
+    let instance = wgpu::Instance::new(wgpu::Backends::PRIMARY);
+    let surface = unsafe { instance.create_surface(window) };
+    let adapter = instance
+        .request_adapter(&wgpu::RequestAdapterOptions {
+            power_preference: wgpu::PowerPreference::LowPower,
+            compatible_surface: Some(&surface),
+            force_fallback_adapter: false,
+        })
+        .await
+        .unwrap();
+    let (device, queue) = adapter
+        .request_device(
+            &wgpu::DeviceDescriptor {
+                features: wgpu::Features::empty(),
+                limits: wgpu::Limits::default(),
+                label: None,
+            },
+            None,
+        )
+        .await
+        .unwrap();
+    let config = wgpu::SurfaceConfiguration {
+        usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
+        format: surface.get_preferred_format(&adapter).unwrap(),
+        width: size.width,
+        height: size.height,
+        present_mode: wgpu::PresentMode::Mailbox,
+    };
+    surface.configure(&device, &config);
+
+    (device, queue, surface, config)
+}
+
+fn main() {
+    let event_loop = EventLoop::new();
+
+    let window = WindowBuilder::new()
+        .with_title("Cyborg Editor")
+        .build(&event_loop)
+        .unwrap();
+
+    let mut egui_state = egui_winit::State::new(4096, &window);
+    let egui_ctx = egui::Context::default();
+
+    let (device, queue, surface, surface_config) = pollster::block_on(get_device(&window));
+
+    let mut egui_rp = egui_wgpu_backend::RenderPass::new(&device, surface_config.format, 1);
+
+    event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Wait;
+        println!("{:?}", event);
+
+        match event {
+            Event::WindowEvent { event, window_id } if window_id == window.id() => match event {
+                WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
+                event => {
+                    egui_state.on_event(&egui_ctx, &event);
+                }
+            },
+            Event::RedrawRequested(window_id) if window_id == window.id() => {
+                match surface.get_current_texture() {
+                    // Err(wgpu::SurfaceError::Lost) => resize(),
+                    Err(wgpu::SurfaceError::OutOfMemory) => *control_flow = ControlFlow::Exit,
+                    Err(e) => eprintln!("Surface error: {:?}", e),
+                    Ok(surface_texture) => {
+                        let raw_input = egui_state.take_egui_input(&window);
+                        let output = egui_ctx.run(raw_input, |ctx| {
+                            egui::CentralPanel::default().show(ctx, |ui| {
+                                ui.heading("Hello world!");
+                            });
+                        });
+                        egui_state.handle_platform_output(
+                            &window,
+                            &egui_ctx,
+                            output.platform_output,
+                        );
+
+                        let meshes = egui_ctx.tessellate(output.shapes);
+
+                        let screen_desc = egui_wgpu_backend::ScreenDescriptor {
+                            physical_width: surface_config.width,
+                            physical_height: surface_config.height,
+                            scale_factor: 1.0, // TODO ???
+                        };
+
+                        egui_rp.update_buffers(&device, &queue, &meshes, &screen_desc);
+                        egui_rp
+                            .add_textures(&device, &queue, &output.textures_delta)
+                            .unwrap();
+
+                        let output_view = surface_texture.texture.create_view(&Default::default());
+                        let mut cmds = device.create_command_encoder(&Default::default());
+                        egui_rp
+                            .execute(&mut cmds, &output_view, &meshes, &screen_desc, None)
+                            .unwrap();
+                        queue.submit(std::iter::once(cmds.finish()));
+                        surface_texture.present();
+                        egui_rp.remove_textures(output.textures_delta).unwrap();
+                    }
+                }
+            }
+            Event::MainEventsCleared => {
+                window.request_redraw();
+            }
+            _ => (),
+        }
+    });
 }