From 9876672a3ec84fa964271d81bc2ce3708103efd2 Mon Sep 17 00:00:00 2001
From: Marco Thomas <mail@marco-thomas.net>
Date: Tue, 17 Aug 2021 19:14:40 +0200
Subject: [PATCH] Initial Commit

---
 .gitignore  |    1 +
 Cargo.lock  | 2026 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   15 +
 README.md   |   12 +
 src/main.rs |  191 +++++
 5 files changed, 2245 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 README.md
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
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index 0000000..ea8c4bf
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..25180cd
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+ "arrayvec",
+ "js-sys",
+ "log",
+ "naga",
+ "parking_lot",
+ "raw-window-handle",
+ "smallvec",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+ "wgpu-core",
+ "wgpu-types",
+]
+
+[[package]]
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+ "arrayvec",
+ "bitflags",
+ "cfg_aliases",
+ "copyless",
+ "fxhash",
+ "gfx-backend-dx11",
+ "gfx-backend-dx12",
+ "gfx-backend-empty",
+ "gfx-backend-gl",
+ "gfx-backend-metal",
+ "gfx-backend-vulkan",
+ "gfx-hal",
+ "gpu-alloc",
+ "gpu-descriptor",
+ "log",
+ "naga",
+ "parking_lot",
+ "profiling",
+ "raw-window-handle",
+ "smallvec",
+ "thiserror",
+ "wgpu-types",
+]
+
+[[package]]
+name = "wgpu-testing"
+version = "0.1.0"
+dependencies = [
+ "cgmath",
+ "env_logger",
+ "image",
+ "log",
+ "pollster",
+ "wgpu",
+ "winit",
+]
+
+[[package]]
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+ "winapi-x86_64-pc-windows-gnu",
+]
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+ "cocoa",
+ "core-foundation 0.9.1",
+ "core-graphics 0.22.2",
+ "core-video-sys",
+ "dispatch",
+ "instant",
+ "lazy_static",
+ "libc",
+ "log",
+ "mio",
+ "mio-misc",
+ "ndk",
+ "ndk-glue",
+ "ndk-sys",
+ "objc",
+ "parking_lot",
+ "percent-encoding",
+ "raw-window-handle",
+ "scopeguard",
+ "smithay-client-toolkit",
+ "wayland-client",
+ "winapi",
+ "x11-dl",
+]
+
+[[package]]
+name = "wio"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d129932f4644ac2396cb456385cbf9e63b5b30c6e8dc4820bdca4eb082037a5"
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+ "winapi",
+]
+
+[[package]]
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+dependencies = [
+ "lazy_static",
+ "libc",
+ "maybe-uninit",
+ "pkg-config",
+]
+
+[[package]]
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+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3a9a231574ae78801646617cefd13bfe94be907c0e4fa979cfd8b770aa3c5d08"
+dependencies = [
+ "nom",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..63edd7f
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "wgpu-rs-learning"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+image = "0.23"
+winit = "0.25"
+cgmath = "0.18"
+env_logger = "0.9"
+log = "0.4"
+wgpu = "0.9"
+pollster = "0.2"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8262781
--- /dev/null
+++ b/README.md
@@ -0,0 +1,12 @@
+# wgpu-rs-learning
+This repo holds the code, with which I learn
+[wgpu](https://docs.rs/wgpu/0.9.0/wgpu/index.html).
+
+The main idea for me, is to keep an eye on my progress and track
+milestones.
+
+### Learning Resources
+I will try to keep this list up to date with all resources, which
+I use for learning.
+- https://sotrh.github.io/learn-wgpu/#what-is-wgpu (Starting point for this project)
+- https://github.com/sotrh/learn-wgpu (Matching GitHub Repo)
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..a0dcb78
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,191 @@
+use winit::{
+    event::*,
+    event_loop::{ControlFlow, EventLoop},
+    window::{Window, WindowBuilder},
+};
+
+/// Hold state with important information
+struct State {
+    surface: wgpu::Surface,
+    device: wgpu::Device,
+    queue: wgpu::Queue,
+    sc_desc: wgpu::SwapChainDescriptor,
+    swap_chain: wgpu::SwapChain,
+    size: winit::dpi::PhysicalSize<u32>,
+    clear_color: wgpu::Color,
+}
+
+impl State {
+    async fn new(window: &Window) -> Self {
+        // actual screen size
+        let size = window.inner_size();
+        // handle to gpu
+        let instance = wgpu::Instance::new(wgpu::BackendBit::PRIMARY);
+        // a surface to draw to
+        let surface = unsafe { instance.create_surface(window) };
+        // get a working adapter for the current system
+        let adapter = instance.request_adapter(
+            &wgpu::RequestAdapterOptions {
+                power_preference: wgpu::PowerPreference::default(),
+                compatible_surface: Some(&surface),
+            },
+        ).await.unwrap();
+        // adapter device and queue
+        let (device, queue) = adapter.request_device(
+            &wgpu::DeviceDescriptor {
+                // no special features required
+                features: wgpu::Features::empty(),
+                // limits of the adapter
+                limits: wgpu::Limits::default(),
+                label: None,
+            },
+            None, // Trace path
+        ).await.unwrap();
+        // description of the swap_chain
+        let sc_desc = wgpu::SwapChainDescriptor {
+            // how textures will be used
+            usage: wgpu::TextureUsage::RENDER_ATTACHMENT,
+            // how swap_chain textures will be stored
+            format: adapter.get_swap_chain_preferred_format(&surface).unwrap(),
+            // size of the swap_chain
+            width: size.width,
+            height: size.height,
+            // how to sync with the display
+            present_mode: wgpu::PresentMode::Fifo,
+        };
+        // actually create a swap_chain
+        let swap_chain = device.create_swap_chain(&surface, &sc_desc);
+
+        Self {
+            surface,
+            device,
+            queue,
+            sc_desc, // saved, so we can create a new swap_chain later
+            swap_chain,
+            size,
+            clear_color: wgpu::Color { r: 0.6, g: 0.6, b: 0.1, a: 1.0 },
+        }
+    }
+
+    /// Corecctly resize the window
+    fn resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>) {
+        if new_size.width > 0 && new_size.height > 0 {
+            self.size = new_size;
+            self.sc_desc.width = new_size.width;
+            self.sc_desc.height = new_size.height;
+            self.swap_chain = self.device.create_swap_chain(&self.surface, &self.sc_desc);
+        }
+    }
+
+    /// Idicate, whether an event has been fully processed
+    fn input(&mut self, event: &WindowEvent) -> bool {
+        match event {
+            WindowEvent::CursorMoved { position, .. } => {
+                let x = (position.x as f64) / 1000 as f64;
+                let y = (position.y as f64) / 1000 as f64;
+                self.clear_color = wgpu::Color { r: x, g: x, b: y, a: 1.0};
+                true
+            }
+            _ => false
+        }
+    }
+
+    /// TODO
+    fn update(&mut self) {
+    }
+
+    /// Generate commands for gpu to render to frame
+    fn render(&mut self) -> Result<(), wgpu::SwapChainError> {
+        // current screen
+        let frame = self.swap_chain
+            .get_current_frame()?
+            .output;
+        // encoder to talk to the gpu
+        let mut encoder = self.device
+            .create_command_encoder(
+                &wgpu::CommandEncoderDescriptor {
+                    label: Some("Render Encoder"),
+                });
+        // create a render_pass
+        let _render_pass = encoder.begin_render_pass(
+            &wgpu::RenderPassDescriptor {
+                label: Some("Render Pass"),
+                color_attachments: &[
+                    wgpu::RenderPassColorAttachment {
+                        view: &frame.view, // draw to current screen
+                        resolve_target: None, // no multisampling yet
+                        ops: wgpu::Operations {
+                            load: wgpu::LoadOp::Clear(self.clear_color),
+                            store: true,
+                        }
+                    }
+                ],
+                depth_stencil_attachment: None,
+            });
+
+        // drop so encoder isn't borrowed mutually anymore
+        drop(_render_pass);
+
+        // submit finished command buffers
+        self.queue.submit(std::iter::once(encoder.finish()));
+
+        Ok(())
+    }
+}
+
+fn main() {
+    env_logger::init();
+    let event_loop = EventLoop::new();
+    let window = WindowBuilder::new().build(&event_loop).unwrap();
+    // wait until Future is ready
+    let mut state = pollster::block_on(State::new(&window));
+
+    event_loop.run(move |event, _, control_flow| match event {
+        Event::WindowEvent {
+            ref event, // forward event
+            window_id
+        } if window_id == window.id() // be sure to only use the current one
+            => if !state.input(event) { // don't continue if input hasn't been processed yet
+                match event {
+                    // TODO can't this be moved to state.input()
+                    WindowEvent::CloseRequested |
+                    WindowEvent::KeyboardInput {
+                        input: KeyboardInput {
+                            state: ElementState::Pressed,
+                            virtual_keycode: Some(VirtualKeyCode::Escape),
+                            // ignore the other entries
+                            ..
+                        },
+                        // ignore the other entries
+                        ..
+                    } => *control_flow = ControlFlow::Exit,
+                    WindowEvent::Resized(physical_size) => {
+                        state.resize(*physical_size)
+                    },
+                    WindowEvent::ScaleFactorChanged {new_inner_size, ..} => {
+                        state.resize(**new_inner_size);
+                    },
+                    // Discard all other WindowEvents
+                    _ => {}
+                }
+            },
+        Event::RedrawRequested(_) => {
+            state.update();
+            match state.render() {
+                Ok(_) => {},
+                // recreate swap_chain
+                Err(wgpu::SwapChainError::Lost) => state.resize(state.size),
+                // no memory left, so quit
+                Err(wgpu::SwapChainError::OutOfMemory) => *control_flow = ControlFlow::Exit,
+                // Outdated, Timeout should be handled by the nnext frame
+                Err(error) => eprintln!("{:?}", error),
+            }
+        },
+        Event::MainEventsCleared => {
+            // RedrawRequested will only trigger once, unless we manually request it
+            window.request_redraw();
+        }
+        // Discard all other Events
+        _ => {}
+    });
+}