├── .gitignore
├── Cargo.lock
├── Cargo.toml
├── README.md
├── app
    ├── Cargo.toml
    └── src
    │   ├── gui.rs
    │   └── main.rs
├── nannou-ray-tracer-screenshot.png
├── rust-toolchain
├── shader
    ├── Cargo.toml
    └── src
    │   └── lib.rs
└── shared
    ├── Cargo.toml
    └── src
        └── lib.rs


/.gitignore:
--------------------------------------------------------------------------------
1 | /target
2 | 


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3136 |  "lazy_static",
3137 |  "pkg-config",
3138 | ]
3139 | 
3140 | [[package]]
3141 | name = "web-sys"
3142 | version = "0.3.50"
3143 | source = "registry+https://github.com/rust-lang/crates.io-index"
3144 | checksum = "a905d57e488fec8861446d3393670fb50d27a262344013181c2cdf9fff5481be"
3145 | dependencies = [
3146 |  "js-sys",
3147 |  "wasm-bindgen",
3148 | ]
3149 | 
3150 | [[package]]
3151 | name = "weezl"
3152 | version = "0.1.5"
3153 | source = "registry+https://github.com/rust-lang/crates.io-index"
3154 | checksum = "d8b77fdfd5a253be4ab714e4ffa3c49caf146b4de743e97510c0656cf90f1e8e"
3155 | 
3156 | [[package]]
3157 | name = "wgpu"
3158 | version = "0.8.1"
3159 | source = "registry+https://github.com/rust-lang/crates.io-index"
3160 | checksum = "215fd50e66f794bd16683e7e0e0b9b53be265eb10fdf02276caf5de3e5743fcf"
3161 | dependencies = [
3162 |  "arrayvec",
3163 |  "js-sys",
3164 |  "log",
3165 |  "naga",
3166 |  "parking_lot",
3167 |  "raw-window-handle",
3168 |  "smallvec",
3169 |  "wasm-bindgen",
3170 |  "wasm-bindgen-futures",
3171 |  "web-sys",
3172 |  "wgpu-core",
3173 |  "wgpu-types",
3174 | ]
3175 | 
3176 | [[package]]
3177 | name = "wgpu-core"
3178 | version = "0.8.1"
3179 | source = "registry+https://github.com/rust-lang/crates.io-index"
3180 | checksum = "1d56c368fc0e6f3927c711d2b55a51ad4321218efc0239c4acf69e456ab70399"
3181 | dependencies = [
3182 |  "arrayvec",
3183 |  "bitflags",
3184 |  "cfg_aliases",
3185 |  "copyless",
3186 |  "fxhash",
3187 |  "gfx-backend-dx11",
3188 |  "gfx-backend-dx12",
3189 |  "gfx-backend-empty",
3190 |  "gfx-backend-gl",
3191 |  "gfx-backend-metal",
3192 |  "gfx-backend-vulkan",
3193 |  "gfx-hal",
3194 |  "gpu-alloc",
3195 |  "gpu-descriptor",
3196 |  "log",
3197 |  "naga",
3198 |  "parking_lot",
3199 |  "profiling",
3200 |  "raw-window-handle",
3201 |  "smallvec",
3202 |  "thiserror",
3203 |  "wgpu-types",
3204 | ]
3205 | 
3206 | [[package]]
3207 | name = "wgpu-types"
3208 | version = "0.8.0"
3209 | source = "registry+https://github.com/rust-lang/crates.io-index"
3210 | checksum = "aa248d90c8e6832269b8955bf800e8241f942c25e18a235b7752226804d21556"
3211 | dependencies = [
3212 |  "bitflags",
3213 | ]
3214 | 
3215 | [[package]]
3216 | name = "winapi"
3217 | version = "0.2.8"
3218 | source = "registry+https://github.com/rust-lang/crates.io-index"
3219 | checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
3220 | 
3221 | [[package]]
3222 | name = "winapi"
3223 | version = "0.3.9"
3224 | source = "registry+https://github.com/rust-lang/crates.io-index"
3225 | checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
3226 | dependencies = [
3227 |  "winapi-i686-pc-windows-gnu",
3228 |  "winapi-x86_64-pc-windows-gnu",
3229 | ]
3230 | 
3231 | [[package]]
3232 | name = "winapi-build"
3233 | version = "0.1.1"
3234 | source = "registry+https://github.com/rust-lang/crates.io-index"
3235 | checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
3236 | 
3237 | [[package]]
3238 | name = "winapi-i686-pc-windows-gnu"
3239 | version = "0.4.0"
3240 | source = "registry+https://github.com/rust-lang/crates.io-index"
3241 | checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
3242 | 
3243 | [[package]]
3244 | name = "winapi-util"
3245 | version = "0.1.5"
3246 | source = "registry+https://github.com/rust-lang/crates.io-index"
3247 | checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
3248 | dependencies = [
3249 |  "winapi 0.3.9",
3250 | ]
3251 | 
3252 | [[package]]
3253 | name = "winapi-x86_64-pc-windows-gnu"
3254 | version = "0.4.0"
3255 | source = "registry+https://github.com/rust-lang/crates.io-index"
3256 | checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
3257 | 
3258 | [[package]]
3259 | name = "winit"
3260 | version = "0.24.0"
3261 | source = "registry+https://github.com/rust-lang/crates.io-index"
3262 | checksum = "da4eda6fce0eb84bd0a33e3c8794eb902e1033d0a1d5a31bc4f19b1b4bbff597"
3263 | dependencies = [
3264 |  "bitflags",
3265 |  "cocoa",
3266 |  "core-foundation 0.9.1",
3267 |  "core-graphics 0.22.2",
3268 |  "core-video-sys",
3269 |  "dispatch",
3270 |  "instant",
3271 |  "lazy_static",
3272 |  "libc",
3273 |  "log",
3274 |  "mio",
3275 |  "mio-extras",
3276 |  "ndk",
3277 |  "ndk-glue",
3278 |  "ndk-sys",
3279 |  "objc",
3280 |  "parking_lot",
3281 |  "percent-encoding",
3282 |  "raw-window-handle",
3283 |  "smithay-client-toolkit 0.12.3",
3284 |  "wayland-client 0.28.5",
3285 |  "winapi 0.3.9",
3286 |  "x11-dl",
3287 | ]
3288 | 
3289 | [[package]]
3290 | name = "wio"
3291 | version = "0.2.2"
3292 | source = "registry+https://github.com/rust-lang/crates.io-index"
3293 | checksum = "5d129932f4644ac2396cb456385cbf9e63b5b30c6e8dc4820bdca4eb082037a5"
3294 | dependencies = [
3295 |  "winapi 0.3.9",
3296 | ]
3297 | 
3298 | [[package]]
3299 | name = "ws2_32-sys"
3300 | version = "0.2.1"
3301 | source = "registry+https://github.com/rust-lang/crates.io-index"
3302 | checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
3303 | dependencies = [
3304 |  "winapi 0.2.8",
3305 |  "winapi-build",
3306 | ]
3307 | 
3308 | [[package]]
3309 | name = "x11-clipboard"
3310 | version = "0.5.2"
3311 | source = "registry+https://github.com/rust-lang/crates.io-index"
3312 | checksum = "b397ace6e980510de59a4fe3d4c758dffab231d6d747ce9fa1aba6b6035d5f32"
3313 | dependencies = [
3314 |  "xcb",
3315 | ]
3316 | 
3317 | [[package]]
3318 | name = "x11-dl"
3319 | version = "2.18.5"
3320 | source = "registry+https://github.com/rust-lang/crates.io-index"
3321 | checksum = "2bf981e3a5b3301209754218f962052d4d9ee97e478f4d26d4a6eced34c1fef8"
3322 | dependencies = [
3323 |  "lazy_static",
3324 |  "libc",
3325 |  "maybe-uninit",
3326 |  "pkg-config",
3327 | ]
3328 | 
3329 | [[package]]
3330 | name = "xcb"
3331 | version = "0.9.0"
3332 | source = "registry+https://github.com/rust-lang/crates.io-index"
3333 | checksum = "62056f63138b39116f82a540c983cc11f1c90cd70b3d492a70c25eaa50bd22a6"
3334 | dependencies = [
3335 |  "libc",
3336 |  "log",
3337 | ]
3338 | 
3339 | [[package]]
3340 | name = "xcursor"
3341 | version = "0.3.3"
3342 | source = "registry+https://github.com/rust-lang/crates.io-index"
3343 | checksum = "3a9a231574ae78801646617cefd13bfe94be907c0e4fa979cfd8b770aa3c5d08"
3344 | dependencies = [
3345 |  "nom",
3346 | ]
3347 | 
3348 | [[package]]
3349 | name = "xdg"
3350 | version = "2.2.0"
3351 | source = "registry+https://github.com/rust-lang/crates.io-index"
3352 | checksum = "d089681aa106a86fade1b0128fb5daf07d5867a509ab036d99988dec80429a57"
3353 | 
3354 | [[package]]
3355 | name = "xml-rs"
3356 | version = "0.8.3"
3357 | source = "registry+https://github.com/rust-lang/crates.io-index"
3358 | checksum = "b07db065a5cf61a7e4ba64f29e67db906fb1787316516c4e6e5ff0fea1efcd8a"
3359 | 


--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
1 | [workspace]
2 | members = ["app", "shader", "shared"]
3 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Real-time Ray Tracing with `nannou` & `rust-gpu`
 2 | 
 3 | An attempt at a real-time implementation of "Ray Tracing in One Weekend" by
 4 | Peter Shirley. This was a personal experiment to learn more about rust-gpu,
 5 | ray tracing, and what limitations there are around ray tracing in real-time.
 6 | 
 7 | ![screenshot](./nannou-ray-tracer-screenshot.png)
 8 | 
 9 | ## Performance
10 | 
11 | A small GUI was developed to tweak the most performance intensive parameters to
12 | better understand what affects performance. E.g. on my XPS 13 with integrated
13 | GPU the render above was taken with 20 rays per pixel and runs at around 3 FPS,
14 | however running the same scene with 2 rays per pixel yields ~25 FPS but with a
15 | much noisier result.
16 | 
17 | ## Build Requirements
18 | 
19 | - Use `rustup` to install nightly Rust and include the `llvm-tools-preview`,
20 |   `rustc-dev` and `rust-src` components. These are necessary for the rust-gpu
21 |   spir-v builder to function.
22 | - `nannou` is used to provide the event loop, wgpu graphics pipeline and a small
23 |   GUI for tweaking performance. Take a look at the platform-specific
24 |   requirements for nannou projects [here](https://guide.nannou.cc/getting_started/platform-specific_setup.html).
25 | 
26 | ## Running
27 | 
28 | To run the project, use:
29 | 
30 | ```
31 | cargo run --release -p nannou-raytracer-app
32 | ```
33 | 
34 | ## Code Structure
35 | 
36 | There are 3 crates in this repo:
37 | 
38 | - `app` is the main application that provides the GUI, builds the Rust shader
39 |   via `SpirvBuilder` and sets up the WGPU pipeline.
40 | - `shader` is the crate containing both the fragment shader and vertex shader
41 |   entrypoints (`main_fs` and `main_vs`).
42 | - `shared` contains code shared between both `app` and `shader`. It declares
43 |   and implements most of the ray-tracing abstractions and logic. By implementing
44 |   most stuff in a shared crate, I could more easily debug certain functions on
45 |   the CPU in the `app` if necessary.
46 | 
47 | ## rust-gpu
48 | 
49 | `rust-gpu` is still very rough around the edges but is already approaching a
50 | dream-come-true.
51 | 
52 | Being able to share code between the CPU and GPU was especially helpful for
53 | debugging. I had a few bugs (poor RNG, tracing an infinite loop, etc) that would
54 | normally be a nightmare to debug in a shader, however in this case I could just
55 | call the same function on the CPU, add some `dbg!`s and work out what the
56 | issue was in no time.
57 | 
58 | I especially look forward to support for ADTs (enums with data) as this would
59 | make looping over `Material`s and `Hittable` objects much easier (the current
60 | workaround uses IDs and indices in a rather hacky manner). Support for trait
61 | objects would be equally nice, though it looks like this would require changes
62 | to the Vulkan specification itself.
63 | 


--------------------------------------------------------------------------------
/app/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "nannou-raytracer-app"
 3 | version = "0.1.0"
 4 | edition = "2018"
 5 | publish = false
 6 | 
 7 | [features]
 8 | default = ["use-compiled-tools"]
 9 | use-installed-tools = ["spirv-builder/use-installed-tools"]
10 | use-compiled-tools = ["spirv-builder/use-compiled-tools"]
11 | 
12 | [dependencies]
13 | fps_ticker = "1"
14 | nannou = { git = "https://github.com/nannou-org/nannou", rev = "81ce490420f9b72e6fe5094c601c47f062bb0f76" }
15 | nannou-raytracer-shared = { path = "../shared" }
16 | spirv-builder = { git = "https://github.com/EmbarkStudios/rust-gpu", default-features = false }
17 | 


--------------------------------------------------------------------------------
/app/src/gui.rs:
--------------------------------------------------------------------------------
  1 | use crate::Config;
  2 | use fps_ticker::Fps;
  3 | use nannou::prelude::*;
  4 | use nannou::ui::prelude::*;
  5 | use shared::ShaderConstants;
  6 | 
  7 | pub const WIN_W: u32 = 280;
  8 | pub const WIN_X: i32 = PAD as i32;
  9 | pub const PAD: Scalar = 20.0;
 10 | const COL_W: Scalar = WIN_W as Scalar - PAD * 2.0;
 11 | const LABEL_FONT_SIZE: u32 = 12;
 12 | const DEFAULT_WIDGET_H: Scalar = 30.0;
 13 | 
 14 | widget_ids! {
 15 |     pub struct Ids {
 16 |         background,
 17 |         title_text,
 18 |         scene_fps_text,
 19 |         scene_fps_avg_text,
 20 |         scene_fps_min_text,
 21 |         scene_fps_max_text,
 22 |         render_text,
 23 |         render_scale_slider,
 24 |         rays_per_pixel_slider,
 25 |         ray_bounce_limit_slider,
 26 |         seed_rng_with_time_button,
 27 |         camera_text,
 28 |         camera_vfov_slider,
 29 |         camera_aperture_slider,
 30 |         camera_focus_dist_slider,
 31 |     }
 32 | }
 33 | 
 34 | /// Update the user interface.
 35 | pub fn update(
 36 |     ref mut ui: UiCell,
 37 |     ids: &Ids,
 38 |     scene_fps: &Fps,
 39 |     config: &mut Config,
 40 |     push_constants: &mut ShaderConstants,
 41 | ) {
 42 |     widget::Canvas::new()
 43 |         .border(0.0)
 44 |         .rgb(0.1, 0.1, 0.1)
 45 |         .pad(PAD)
 46 |         .set(ids.background, ui);
 47 | 
 48 |     // Title
 49 | 
 50 |     text("NANNOU RAYTRACER")
 51 |         .mid_top_of(ids.background)
 52 |         .set(ids.title_text, ui);
 53 | 
 54 |     // Scene FPS
 55 | 
 56 |     fn fps_to_rgb(fps: f64) -> (f32, f32, f32) {
 57 |         let r = clamp(map_range(fps, 0.0, 60.0, 1.0, 0.0), 0.0, 1.0);
 58 |         let g = clamp(map_range(fps, 0.0, 60.0, 0.0, 1.0), 0.0, 1.0);
 59 |         let b = 0.5;
 60 |         (r, g, b)
 61 |     }
 62 | 
 63 |     widget::Text::new("Scene Performance")
 64 |         .mid_left_of(ids.background)
 65 |         .down(PAD * 1.5)
 66 |         .font_size(16)
 67 |         .color(color::WHITE)
 68 |         .set(ids.scene_fps_text, ui);
 69 | 
 70 |     let label = format!("{:.2} AVG FPS", scene_fps.avg());
 71 |     let (r, g, b) = fps_to_rgb(scene_fps.avg());
 72 |     widget::Text::new(&label)
 73 |         .down(PAD)
 74 |         .font_size(14)
 75 |         .rgb(r, g, b)
 76 |         .set(ids.scene_fps_avg_text, ui);
 77 | 
 78 |     let label = format!("{:.2} MIN FPS", scene_fps.min());
 79 |     let (r, g, b) = fps_to_rgb(scene_fps.min());
 80 |     widget::Text::new(&label)
 81 |         .down(PAD * 0.5)
 82 |         .font_size(14)
 83 |         .rgb(r, g, b)
 84 |         .set(ids.scene_fps_min_text, ui);
 85 | 
 86 |     let label = format!("{:.2} MAX FPS", scene_fps.max());
 87 |     let (r, g, b) = fps_to_rgb(scene_fps.max());
 88 |     widget::Text::new(&label)
 89 |         .down(PAD * 0.5)
 90 |         .font_size(14)
 91 |         .rgb(r, g, b)
 92 |         .set(ids.scene_fps_max_text, ui);
 93 | 
 94 |     // Render
 95 | 
 96 |     widget::Text::new("Render Control")
 97 |         .mid_left_of(ids.background)
 98 |         .down(PAD * 1.5)
 99 |         .font_size(16)
100 |         .color(color::WHITE)
101 |         .set(ids.render_text, ui);
102 | 
103 |     let min = 0.025;
104 |     let max = 1.0;
105 |     let label = format!("Render scale: {:.2}", config.render_scale);
106 |     for scale in slider(config.render_scale, min, max)
107 |         .label(&label)
108 |         .down(PAD)
109 |         .set(ids.render_scale_slider, ui)
110 |     {
111 |         config.render_scale = scale;
112 |     }
113 | 
114 |     let min = 1.0;
115 |     let max = 100.0;
116 |     let label = format!("Rays per pixel: {}", push_constants.rays_per_pixel);
117 |     for rays in slider(push_constants.rays_per_pixel as f32, min, max)
118 |         .label(&label)
119 |         .mid_left_of(ids.background)
120 |         .skew(2.0)
121 |         .down(PAD * 0.5)
122 |         .set(ids.rays_per_pixel_slider, ui)
123 |     {
124 |         push_constants.rays_per_pixel = rays.round() as u32;
125 |     }
126 | 
127 |     let min = 1.0;
128 |     let max = 50.0;
129 |     let label = format!("Ray bounce limit: {}", push_constants.ray_bounce_limit);
130 |     for limit in slider(push_constants.ray_bounce_limit as f32, min, max)
131 |         .label(&label)
132 |         .down(PAD * 0.5)
133 |         .set(ids.ray_bounce_limit_slider, ui)
134 |     {
135 |         push_constants.ray_bounce_limit = limit.round() as u32;
136 |     }
137 | 
138 |     let (label, color) = match config.seed_rng_with_time {
139 |         true => ("ON", ui::color::BLUE),
140 |         false => ("OFF", ui::color::DARK_CHARCOAL),
141 |     };
142 |     let label = format!("Animate Noise: {}", label);
143 |     for _click in button()
144 |         .label(&label)
145 |         .color(color)
146 |         .down(PAD * 0.5)
147 |         .set(ids.seed_rng_with_time_button, ui)
148 |     {
149 |         config.seed_rng_with_time = !config.seed_rng_with_time;
150 |     }
151 | 
152 |     // Camera
153 | 
154 |     widget::Text::new("Camera")
155 |         .mid_left_of(ids.background)
156 |         .down(PAD * 1.5)
157 |         .font_size(16)
158 |         .color(color::WHITE)
159 |         .set(ids.camera_text, ui);
160 | 
161 |     let pi = core::f32::consts::PI;
162 |     let min = pi * 0.16;
163 |     let max = pi - min;
164 |     let label = format!("Field of View: {:.3} radians", push_constants.vfov);
165 |     for vfov in slider(push_constants.vfov, min, max)
166 |         .label(&label)
167 |         .down(PAD)
168 |         .set(ids.camera_vfov_slider, ui)
169 |     {
170 |         push_constants.vfov = vfov;
171 |     }
172 | 
173 |     let min = 0.0;
174 |     let max = 4.0;
175 |     let label = format!("Aperture: {:.3}", push_constants.aperture);
176 |     for value in slider(push_constants.aperture, min, max)
177 |         .label(&label)
178 |         .down(PAD * 0.5)
179 |         .skew(2.0)
180 |         .set(ids.camera_aperture_slider, ui)
181 |     {
182 |         push_constants.aperture = value;
183 |     }
184 | 
185 | }
186 | 
187 | fn text(s: &str) -> widget::Text {
188 |     widget::Text::new(s).color(color::WHITE)
189 | }
190 | 
191 | fn button() -> widget::Button<'static, widget::button::Flat> {
192 |     widget::Button::new()
193 |         .w_h(COL_W, DEFAULT_WIDGET_H)
194 |         .label_font_size(LABEL_FONT_SIZE)
195 |         .color(color::DARK_CHARCOAL)
196 |         .label_color(color::WHITE)
197 |         .border(0.0)
198 | }
199 | 
200 | fn slider(val: f32, min: f32, max: f32) -> widget::Slider<'static, f32> {
201 |     widget::Slider::new(val, min, max)
202 |         .w_h(COL_W, DEFAULT_WIDGET_H)
203 |         .label_font_size(LABEL_FONT_SIZE)
204 |         .color(color::DARK_CHARCOAL)
205 |         .label_color(color::WHITE)
206 |         .border(0.0)
207 | }
208 | 


--------------------------------------------------------------------------------
/app/src/main.rs:
--------------------------------------------------------------------------------
  1 | use fps_ticker::Fps;
  2 | use nannou::prelude::*;
  3 | use nannou::ui::prelude::*;
  4 | use shared::ShaderConstants;
  5 | use spirv_builder::{Capability, MetadataPrintout, SpirvBuilder};
  6 | use std::borrow::Cow;
  7 | use std::path::PathBuf;
  8 | 
  9 | mod gui;
 10 | mod shaders {
 11 |     #[allow(non_upper_case_globals)]
 12 |     pub const main_fs: &str = "main_fs";
 13 |     #[allow(non_upper_case_globals)]
 14 |     pub const main_vs: &str = "main_vs";
 15 | }
 16 | 
 17 | fn main() {
 18 |     nannou::app(model).update(update).run();
 19 | }
 20 | 
 21 | struct Model {
 22 |     gui_window: window::Id,
 23 |     scene_window: window::Id,
 24 |     push_constants: ShaderConstants,
 25 |     shader_mod: wgpu::ShaderModule,
 26 |     graphics: Graphics,
 27 |     config: Config,
 28 |     scene_fps: Fps,
 29 |     ui: Ui,
 30 |     ids: gui::Ids,
 31 | }
 32 | 
 33 | pub struct Config {
 34 |     pub render_scale: f32,
 35 |     pub seed_rng_with_time: bool,
 36 | }
 37 | 
 38 | struct Graphics {
 39 |     pipeline_layout: wgpu::PipelineLayout,
 40 |     pipeline: wgpu::RenderPipeline,
 41 |     // The scaled texture to which the raytraced scene is rendered.
 42 |     scaled_texture: wgpu::Texture,
 43 |     // Reshapes the scene texture to the swap chain image texture.
 44 |     texture_reshaper: wgpu::TextureReshaper,
 45 | }
 46 | 
 47 | const WIN_H: u32 = 640;
 48 | const SCENE_WIN_W: u32 = WIN_H * 21 / 9;
 49 | const WIN_Y: i32 = gui::PAD as i32;
 50 | const SCENE_WIN_X: i32 = gui::WIN_X + gui::WIN_W as i32 + gui::PAD as i32;
 51 | 
 52 | impl Default for Config {
 53 |     fn default() -> Self {
 54 |         Self {
 55 |             render_scale: 0.5,
 56 |             seed_rng_with_time: true,
 57 |         }
 58 |     }
 59 | }
 60 | 
 61 | fn model(app: &App) -> Model {
 62 |     let gui_window = app
 63 |         .new_window()
 64 |         .title("raytracer controls")
 65 |         .size(gui::WIN_W, WIN_H)
 66 |         .view(view_ui)
 67 |         .build()
 68 |         .unwrap();
 69 | 
 70 |     // We need a window backed by a wgpu device that supports push constants.
 71 |     let device_desc = wgpu::DeviceDescriptor {
 72 |         label: Some("nannou-raytracer-device"),
 73 |         features: wgpu::Features::PUSH_CONSTANTS,
 74 |         limits: wgpu::Limits {
 75 |             max_push_constant_size: 256,
 76 |             ..Default::default()
 77 |         },
 78 |     };
 79 | 
 80 |     let scene_window = app
 81 |         .new_window()
 82 |         .title("nannou + rust-gpu raytracer")
 83 |         .device_descriptor(device_desc)
 84 |         .size(SCENE_WIN_W, WIN_H)
 85 |         .view(view_scene)
 86 |         .build()
 87 |         .unwrap();
 88 | 
 89 |     let w = app.window(gui_window).expect("UI window closed unexpectedly");
 90 |     let scale = w.scale_factor();
 91 |     let y = (WIN_Y as f32 * scale) as i32;
 92 |     let x = (gui::WIN_X as f32 * scale) as i32;
 93 |     w.set_outer_position_pixels(x, y);
 94 | 
 95 |     {
 96 |         let w = app.window(scene_window)
 97 |             .expect("scene window closed unexpectedly");
 98 |         let x = (SCENE_WIN_X as f32 * scale) as i32;
 99 |         w.set_outer_position_pixels(x, WIN_Y);
100 |     }
101 | 
102 |     // Initialise UI.
103 |     let mut ui = app
104 |         .new_ui()
105 |         .window(gui_window)
106 |         .build()
107 |         .expect("failed to build `Ui` for GUI window");
108 |     let ids = gui::Ids::new(ui.widget_id_generator());
109 | 
110 |     // Load the rust-gpu shader.
111 |     let scene_win = app.window(scene_window).unwrap();
112 |     let device = scene_win.swap_chain_device();
113 |     let shader_mod_desc = load_shader_module_desc();
114 |     let shader_mod = device.create_shader_module(&shader_mod_desc);
115 | 
116 |     let scene_fps = Fps::default();
117 |     let config = Config::default();
118 |     let push_constants = ShaderConstants {
119 |         rays_per_pixel: 2,
120 |         ray_bounce_limit: 8,
121 |         vfov: core::f32::consts::PI * 0.5,
122 |         aperture: 0.0,
123 |         ..Default::default()
124 |     };
125 |     let msaa_samples = scene_win.msaa_samples();
126 |     let format = Frame::TEXTURE_FORMAT;
127 |     let (w_px, h_px) = scene_win.inner_size_pixels();
128 |     let scaled_texture_size = scaled_texture_size([w_px, h_px], config.render_scale);
129 |     let graphics = create_graphics(device, &shader_mod, format, msaa_samples, scaled_texture_size);
130 | 
131 |     Model {
132 |         gui_window,
133 |         scene_window,
134 |         shader_mod,
135 |         graphics,
136 |         scene_fps,
137 |         config,
138 |         push_constants,
139 |         ui,
140 |         ids,
141 |     }
142 | }
143 | 
144 | fn update(app: &App, model: &mut Model, _: Update) {
145 |     {
146 |         let ui = model.ui.set_widgets();
147 |         gui::update(
148 |             ui,
149 |             &model.ids,
150 |             &model.scene_fps,
151 |             &mut model.config,
152 |             &mut model.push_constants,
153 |         );
154 |     }
155 | 
156 |     // Recreate scaled texture and reshaper if scale changed.
157 |     let win = app.window(model.scene_window).unwrap();
158 |     let (win_w_px, win_h_px) = win.inner_size_pixels();
159 |     let scaled_texture_size = scaled_texture_size([win_w_px, win_h_px], model.config.render_scale);
160 |     if scaled_texture_size != model.graphics.scaled_texture.size() {
161 |         let device = win.swap_chain_device();
162 |         let msaa_samples = win.msaa_samples();
163 |         let format = Frame::TEXTURE_FORMAT;
164 |         model.graphics = create_graphics(device, &model.shader_mod, format, msaa_samples, scaled_texture_size);
165 |     }
166 | 
167 |     let pc = &mut model.push_constants;
168 | 
169 |     pc.time = app.time;
170 |     pc.rng_seed_offset = if model.config.seed_rng_with_time {
171 |         app.time
172 |     } else {
173 |         0.0
174 |     };
175 | 
176 |     let [w_px, h_px] = model.graphics.scaled_texture.size();
177 |     pc.view_size_pixels = [w_px, h_px];
178 | 
179 |     let win = app.window(model.scene_window).unwrap();
180 |     let win_rect = win.rect();
181 |     let m = app.mouse.position();
182 |     let mouse_x = map_range(m.x, win_rect.left(), win_rect.right(), 0.0, w_px as f32);
183 |     let mouse_y = map_range(m.y, win_rect.top(), win_rect.bottom(), 0.0, h_px as f32);
184 |     pc.mouse_pixels = [mouse_x, mouse_y];
185 | }
186 | 
187 | fn view_ui(app: &App, model: &Model, frame: Frame) {
188 |     frame.clear(BLACK);
189 |     model
190 |         .ui
191 |         .draw_to_frame(app, &frame)
192 |         .expect("failed to draw `Ui` to `Frame`");
193 | }
194 | 
195 | fn view_scene(_app: &App, model: &Model, frame: Frame) {
196 |     frame.clear(BLACK);
197 | 
198 |     // Encode the commands for rendering to the scaled texture.
199 |     let mut encoder = frame.command_encoder();
200 |     {
201 |         let texture_view = model.graphics.scaled_texture.view().build();
202 |         let mut render_pass = wgpu::RenderPassBuilder::new()
203 |             .color_attachment(&texture_view, |color| color.load_op(wgpu::LoadOp::Load))
204 |             .begin(&mut encoder);
205 |         render_pass.set_pipeline(&model.graphics.pipeline);
206 |         let pc_bytes = unsafe { any_as_u8_slice(&model.push_constants) };
207 |         render_pass.set_push_constants(wgpu::ShaderStage::all(), 0, pc_bytes);
208 |         let vertex_range = 0..3;
209 |         let instance_range = 0..1;
210 |         render_pass.draw(vertex_range, instance_range);
211 |     }
212 | 
213 |     // Draw the scaled texture to the frame.
214 |     model
215 |         .graphics
216 |         .texture_reshaper
217 |         .encode_render_pass(frame.texture_view(), &mut *encoder);
218 | 
219 |     model.scene_fps.tick();
220 | }
221 | 
222 | fn scaled_texture_size(win_size_px: [u32; 2], scale: f32) -> [u32; 2] {
223 |     let [w, h] = win_size_px;
224 |     [(w as f32 * scale) as u32, (h as f32 * scale) as u32]
225 | }
226 | 
227 | fn create_graphics(
228 |     device: &wgpu::Device,
229 |     shader_mod: &wgpu::ShaderModule,
230 |     dst_format: wgpu::TextureFormat,
231 |     sample_count: u32,
232 |     scaled_texture_size: [u32; 2],
233 | ) -> Graphics {
234 |     let scaled_texture_sample_count = 1;
235 |     let scaled_texture_format = wgpu::TextureFormat::Rgba16Float;
236 | 
237 |     // Create our custom texture.
238 |     let scaled_texture = wgpu::TextureBuilder::new()
239 |         .size(scaled_texture_size)
240 |         // Our texture will be used as the RENDER_ATTACHMENT for our `Draw` render pass.
241 |         // It will also be SAMPLED by the `TextureCapturer` and `TextureResizer`.
242 |         .usage(wgpu::TextureUsage::RENDER_ATTACHMENT | wgpu::TextureUsage::SAMPLED)
243 |         // Use nannou's default multisampling sample count.
244 |         .sample_count(scaled_texture_sample_count)
245 |         // Use a spacious 16-bit linear sRGBA format suitable for high quality drawing.
246 |         .format(scaled_texture_format)
247 |         // Build it!
248 |         .build(device);
249 | 
250 |     // Create the texture reshaper.
251 |     let texture_view = scaled_texture.view().build();
252 |     let texture_sample_type = scaled_texture.sample_type();
253 |     let texture_reshaper = wgpu::TextureReshaper::new(
254 |         device,
255 |         &texture_view,
256 |         scaled_texture_sample_count,
257 |         texture_sample_type,
258 |         sample_count,
259 |         dst_format,
260 |     );
261 | 
262 |     let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
263 |         label: Some("nannou-raytracer-pipeline-layout"),
264 |         bind_group_layouts: &[],
265 |         push_constant_ranges: &[wgpu::PushConstantRange {
266 |             stages: wgpu::ShaderStage::all(),
267 |             range: 0..std::mem::size_of::<ShaderConstants>() as u32,
268 |         }],
269 |     });
270 | 
271 |     let pipeline = wgpu::RenderPipelineBuilder::from_layout(&pipeline_layout, &shader_mod)
272 |         .fragment_shader(&shader_mod)
273 |         .vertex_entry_point(shaders::main_vs)
274 |         .fragment_entry_point(shaders::main_fs)
275 |         .color_format(scaled_texture_format)
276 |         .color_blend(wgpu::BlendComponent::OVER)
277 |         .alpha_blend(wgpu::BlendComponent::REPLACE)
278 |         .sample_count(scaled_texture_sample_count)
279 |         .build(device);
280 | 
281 |     Graphics {
282 |         pipeline_layout,
283 |         pipeline,
284 |         scaled_texture,
285 |         texture_reshaper,
286 |     }
287 | }
288 | 
289 | fn load_shader_module_desc() -> wgpu::ShaderModuleDescriptor<'static> {
290 |     let manifest_dir = env!("CARGO_MANIFEST_DIR");
291 |     let crate_path = [manifest_dir, "..", "shader"]
292 |         .iter()
293 |         .copied()
294 |         .collect::<PathBuf>();
295 |     let compile_result = SpirvBuilder::new(crate_path, "spirv-unknown-vulkan1.1")
296 |         .print_metadata(MetadataPrintout::None)
297 |         // Seems to be needed to handle conditions within functions?
298 |         // Error was confusing but adding this worked.
299 |         .capability(Capability::Int8)
300 |         .build()
301 |         .unwrap();
302 |     let module_path = compile_result.module.unwrap_single();
303 |     let data = std::fs::read(module_path).unwrap();
304 |     let spirv = wgpu::util::make_spirv(&data);
305 |     let spirv = match spirv {
306 |         wgpu::ShaderSource::Wgsl(cow) => wgpu::ShaderSource::Wgsl(Cow::Owned(cow.into_owned())),
307 |         wgpu::ShaderSource::SpirV(cow) => {
308 |             wgpu::ShaderSource::SpirV(Cow::Owned(cow.into_owned()))
309 |         }
310 |     };
311 |     wgpu::ShaderModuleDescriptor {
312 |         label: Some("nannou-raytracer-shader"),
313 |         source: spirv,
314 |         flags: wgpu::ShaderFlags::default(),
315 |     }
316 | }
317 | 
318 | // NOTE: Super unsafe for general use, OK for this case.
319 | unsafe fn any_as_u8_slice<T: Sized>(p: &T) -> &[u8] {
320 |     std::slice::from_raw_parts((p as *const T) as *const u8, std::mem::size_of::<T>())
321 | }
322 | 


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/nannou-ray-tracer-screenshot.png:
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https://raw.githubusercontent.com/mitchmindtree/nannou-rustgpu-raytracer/4ae64e1cb4ad2205b17379434e7e8d67ce184090/nannou-ray-tracer-screenshot.png


--------------------------------------------------------------------------------
/rust-toolchain:
--------------------------------------------------------------------------------
1 | [toolchain]
2 | channel = "nightly-2022-04-11"
3 | components = ["rust-src", "rustc-dev", "llvm-tools-preview"]
4 | 


--------------------------------------------------------------------------------
/shader/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "nannou-raytracer-shader"
 3 | version = "0.1.0"
 4 | edition = "2018"
 5 | publish = false
 6 | 
 7 | [lib]
 8 | crate-type = ["dylib"]
 9 | 
10 | [dependencies]
11 | nannou-raytracer-shared = { path = "../shared" }
12 | spirv-std = { git = "https://github.com/EmbarkStudios/rust-gpu", features = ["glam"] }
13 | 


--------------------------------------------------------------------------------
/shader/src/lib.rs:
--------------------------------------------------------------------------------
  1 | #![cfg_attr(
  2 |     target_arch = "spirv",
  3 |     no_std,
  4 |     feature(register_attr),
  5 |     register_attr(spirv)
  6 | )]
  7 | 
  8 | use shared::{color, Camera, Dielectric, Lambertian, MaterialInfo, MaterialKind, Materials, Metal, Rng, ShaderConstants, Sphere};
  9 | use spirv_std::glam::{vec2, vec3, vec4, Vec2, Vec4};
 10 | 
 11 | // Note: This cfg is incorrect on its surface, it really should be "are we compiling with std", but
 12 | // we tie #[no_std] above to the same condition, so it's fine.
 13 | #[cfg(target_arch = "spirv")]
 14 | use spirv_std::num_traits::Float;
 15 | #[cfg(not(target_arch = "spirv"))]
 16 | use spirv_std::macros::spirv;
 17 | 
 18 | #[spirv(fragment)]
 19 | pub fn main_fs(
 20 |     #[spirv(frag_coord)]
 21 |     in_frag_coord: Vec4,
 22 |     #[spirv(push_constant)]
 23 |     constants: &ShaderConstants,
 24 |     output: &mut Vec4,
 25 | ) {
 26 |     // Calc uv coords (i.e. left 0.0, right 1.0, bottom 0.0, top 1.0);
 27 |     let frag_coord = vec2(in_frag_coord.x, in_frag_coord.y);
 28 |     let [w_px, h_px] = constants.view_size_pixels;
 29 | 
 30 |     let time = constants.time;
 31 |     let vfov = constants.vfov;
 32 |     let aperture = constants.aperture;
 33 |     let aspect = w_px as f32 / h_px as f32;
 34 |     let from = vec3((time * 0.77).cos() * 0.125 + 0.125, 1.0 + time.sin() * 0.125 + 0.125, 0.0);
 35 |     let to = vec3(0.0, 1.0, -3.0);
 36 |     let vup = vec3(0.0, 1.0, 0.0);
 37 |     let focus_dist = (from - to).length() - 0.25; // subtract a little to get sphere surface.
 38 |     let cam = Camera::new(from, to, vup, vfov, aspect, aperture, focus_dist);
 39 | 
 40 |     let seed = frag_coord + Vec2::splat(constants.rng_seed_offset);
 41 |     let mut rng = Rng { seed };
 42 | 
 43 |     let materials = Materials {
 44 |         lambertian: [
 45 |             Lambertian::new(vec3(0.8 + (constants.time * 1.7).sin() + 0.5, 0.3, 0.3)),
 46 |             Lambertian::new(vec3(1.0, 0.1, 0.1)),
 47 |             Lambertian::new(vec3(0.1, 1.0, 0.1)),
 48 |             Lambertian::new(vec3(0.9, 0.9, 0.9)),
 49 |             Lambertian::new(vec3(5.0, 5.0, 5.0)),
 50 |         ],
 51 |         metal: [
 52 |             Metal::new(vec3(0.8, 0.6, 0.2), 0.0),
 53 |             Metal::new(vec3(0.8, 0.6, 0.2), 0.05),
 54 |             Metal::new(vec3(0.2, 0.6, 0.8), 0.05),
 55 |             Metal::new(vec3(0.9, 0.9, 0.9), 0.5),
 56 |         ],
 57 |         dielectric: [
 58 |             Dielectric::new(1.5)
 59 |         ],
 60 |     };
 61 | 
 62 |     let world = [
 63 |         Sphere {
 64 |             center: to,
 65 |             radius: 0.5,
 66 |             material: MaterialInfo {
 67 |                 kind: MaterialKind::Metal,
 68 |                 index: 0,
 69 |             },
 70 |         },
 71 |         Sphere {
 72 |             center: vec3(to.x - 1.0, 0.0, to.z + 1.0),
 73 |             radius: 0.5,
 74 |             material: MaterialInfo {
 75 |                 kind: MaterialKind::Dielectric,
 76 |                 index: 0,
 77 |             }
 78 |         },
 79 |         Sphere {
 80 |             center: vec3(1.0, 0.0, -1.0 + (constants.time * 1.32).cos()),
 81 |             radius: 0.5,
 82 |             material: MaterialInfo {
 83 |                 kind: MaterialKind::Metal,
 84 |                 index: 2,
 85 |             },
 86 |         },
 87 | 
 88 |         // Light
 89 |         Sphere {
 90 |             center: to + vec3(
 91 |                         (constants.time * 0.67).sin(),
 92 |                         (constants.time * 0.33).cos(),
 93 |                         (constants.time * 0.57).cos(),
 94 |                     ),
 95 |             radius: 0.1,
 96 |             material: MaterialInfo {
 97 |                 kind: MaterialKind::Lambertian,
 98 |                 index: 3,
 99 |             }
100 |         },
101 | 
102 |         // Floor
103 |         Sphere {
104 |             center: vec3(0.0, -1000.5, -1.0),
105 |             radius: 1000.0,
106 |             material: MaterialInfo {
107 |                 kind: MaterialKind::Lambertian,
108 |                 index: 3,
109 |             },
110 |         },
111 | 
112 |         // Left wall.
113 |         Sphere {
114 |             center: vec3(-22.0, 0.0, -1.0),
115 |             radius: 20.0,
116 |             material: MaterialInfo {
117 |                 kind: MaterialKind::Lambertian,
118 |                 index: 1,
119 |             },
120 |         },
121 | 
122 |         // Right wall.
123 |         Sphere {
124 |             center: vec3(22.0, 0.0, -1.0),
125 |             radius: 20.0,
126 |             material: MaterialInfo {
127 |                 kind: MaterialKind::Lambertian,
128 |                 index: 2,
129 |             },
130 |         },
131 | 
132 |         // Back wall.
133 |         Sphere {
134 |             center: vec3(0.0, 0.0, -24.0),
135 |             radius: 20.0,
136 |             material: MaterialInfo {
137 |                 kind: MaterialKind::Lambertian,
138 |                 index: 3,
139 |             },
140 |         },
141 |     ];
142 | 
143 |     // Cast some rays and average their result.
144 |     let mut col = vec3(0.0, 0.0, 0.0);
145 |     for _ in 0..constants.rays_per_pixel {
146 |         let uv = vec2(
147 |             (frag_coord.x + rng.gen()) / w_px as f32,
148 |             ((h_px as f32 - frag_coord.y) + rng.gen()) / h_px as f32,
149 |         );
150 |         let ray = cam.ray(&mut rng, uv);
151 |         col += color(constants.ray_bounce_limit, &mut rng, ray, world, &materials);
152 |     }
153 |     col /= constants.rays_per_pixel as f32;
154 | 
155 |     // Write the result.
156 |     *output = vec4(col.x, col.y, col.z, 1.0);
157 | }
158 | 
159 | #[spirv(vertex)]
160 | pub fn main_vs(
161 |     #[spirv(vertex_index)]
162 |     vert_idx: i32,
163 |     #[spirv(position)]
164 |     builtin_pos: &mut Vec4,
165 | ) {
166 |     // Create a "full screen triangle" by mapping the vertex index.
167 |     // ported from https://www.saschawillems.de/blog/2016/08/13/vulkan-tutorial-on-rendering-a-fullscreen-quad-without-buffers/
168 |     let uv = vec2(((vert_idx << 1) & 2) as f32, (vert_idx & 2) as f32);
169 |     let pos = 2.0 * uv - Vec2::ONE;
170 |     *builtin_pos = pos.extend(0.0).extend(1.0);
171 | }
172 | 


--------------------------------------------------------------------------------
/shared/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "nannou-raytracer-shared"
 3 | version = "0.1.0"
 4 | edition = "2018"
 5 | publish = false
 6 | 
 7 | [lib]
 8 | name = "shared"
 9 | path = "./src/lib.rs"
10 | 
11 | [dependencies]
12 | spirv-std = { git = "https://github.com/EmbarkStudios/rust-gpu", features = ["glam"] }
13 | 


--------------------------------------------------------------------------------
/shared/src/lib.rs:
--------------------------------------------------------------------------------
  1 | //! Code shared between shader and app.
  2 | 
  3 | #![no_std]
  4 | 
  5 | use spirv_std::{
  6 |     glam::{vec2, vec3, Vec2, Vec3},
  7 |     num_traits::Float,
  8 | };
  9 | 
 10 | /// Types that may be hit by a ray.
 11 | pub trait Hit {
 12 |     /// Whether or not the Ray hits the object along with the associated hit data.
 13 |     fn hit(self, r: &Ray, t_min: f32, t_max: f32, data: &mut HitData) -> bool;
 14 | }
 15 | 
 16 | /// Used to describe the surface of different materials.
 17 | pub trait Material {
 18 |     /// Produce a scattered ray (or say it absorved the incident ray).
 19 |     ///
 20 |     /// If scattered, describes how much the ray should be attenuated.
 21 |     fn scatter(
 22 |         self,
 23 |         r_in: &Ray,
 24 |         hit: &HitData,
 25 |         rng: &mut Rng,
 26 |         attenuation: &mut Vec3,
 27 |         r_out: &mut Ray,
 28 |     ) -> bool;
 29 | }
 30 | 
 31 | #[derive(Copy, Clone, Default)]
 32 | #[repr(C)]
 33 | pub struct HitData {
 34 |     pub t: f32,
 35 |     pub p: Vec3,
 36 |     pub normal: Vec3,
 37 |     pub material: MaterialInfo,
 38 | }
 39 | 
 40 | #[derive(Copy, Clone)]
 41 | #[repr(C)]
 42 | pub enum MaterialKind {
 43 |     Lambertian,
 44 |     Metal,
 45 |     Dielectric,
 46 | }
 47 | 
 48 | #[derive(Copy, Clone)]
 49 | #[repr(C)]
 50 | pub struct MaterialInfo {
 51 |     pub kind: MaterialKind,
 52 |     pub index: usize,
 53 | }
 54 | 
 55 | /// All materials in the world.
 56 | // TODO: Not a portable way of storing materials for a world... Need ADTs or trait objects.
 57 | #[derive(Copy, Clone)]
 58 | #[repr(C)]
 59 | pub struct Materials<const NL: usize, const NM: usize, const ND: usize> {
 60 |     pub lambertian: [Lambertian; NL],
 61 |     pub metal: [Metal; NM],
 62 |     pub dielectric: [Dielectric; ND],
 63 | }
 64 | 
 65 | #[derive(Copy, Clone)]
 66 | #[repr(C)]
 67 | pub struct Lambertian {
 68 |     pub albedo: Vec3,
 69 | }
 70 | 
 71 | #[derive(Copy, Clone)]
 72 | #[repr(C)]
 73 | pub struct Dielectric {
 74 |     // TODO: This should just be a float, but for some reason results in this error if it isn't a
 75 |     // Vec3.
 76 |     //
 77 |     // error: Cannot cast between pointer types
 78 |     //    --> shared/./src/lib.rs:207:6
 79 |     //     |
 80 |     // 207 |     }
 81 |     //     |      ^
 82 |     //     |
 83 |     //     = note: from: *struct Dielectric { ref_idx: f32 }
 84 |     //     = note: to: *u32
 85 |     pub ref_idx: Vec3,
 86 | }
 87 | 
 88 | #[derive(Copy, Clone)]
 89 | #[repr(C)]
 90 | pub struct Metal {
 91 |     pub albedo: Vec3,
 92 |     pub fuzz: f32,
 93 | }
 94 | 
 95 | #[derive(Copy, Clone, Default)]
 96 | #[repr(C)]
 97 | pub struct ShaderConstants {
 98 |     pub view_size_pixels: [u32; 2],
 99 |     pub mouse_pixels: [f32; 2],
100 |     pub time: f32,
101 |     pub rng_seed_offset: f32,
102 | 
103 |     // Rendering
104 |     pub rays_per_pixel: u32,
105 |     pub ray_bounce_limit: u32,
106 | 
107 |     // Camera
108 |     pub vfov: f32,
109 |     pub aperture: f32,
110 |     //pub focus_dist: f32,
111 | 
112 |     // TODO: This would be awesome for automatically improving scene quality when the camera
113 |     // reaches a resting state.
114 |     // pub time_since_camera_move: f32,
115 | }
116 | 
117 | #[derive(Copy, Clone)]
118 | #[repr(C)]
119 | pub struct Ray {
120 |     pub a: Vec3,
121 |     pub b: Vec3,
122 | }
123 | 
124 | #[derive(Copy, Clone)]
125 | #[repr(C)]
126 | pub struct Sphere {
127 |     pub center: Vec3,
128 |     pub radius: f32,
129 |     pub material: MaterialInfo,
130 | }
131 | 
132 | #[derive(Clone, Default)]
133 | pub struct Rng {
134 |     pub seed: Vec2,
135 | }
136 | 
137 | #[derive(Clone)]
138 | pub struct Camera {
139 |     pub origin: Vec3,
140 |     pub lower_left_corner: Vec3,
141 |     pub horizontal: Vec3,
142 |     pub vertical: Vec3,
143 | 
144 |     pub u: Vec3,
145 |     pub v: Vec3,
146 |     pub w: Vec3,
147 |     pub lens_radius: f32,
148 | }
149 | 
150 | impl Camera {
151 |     // pub fn new(window_size_px: Vec2) -> Self {
152 |     //     let w_px = window_size_px.x;
153 |     //     let h_px = window_size_px.y;
154 |     //     let min_side_px = w_px.min(h_px);
155 | 
156 |     /// Vertical field of view in radians and aspect ratio.
157 |     pub fn new(
158 |         from: Vec3,
159 |         to: Vec3,
160 |         vup: Vec3,
161 |         vfov: f32,
162 |         aspect: f32,
163 |         aperture: f32,
164 |         focus_dist: f32,
165 |     ) -> Self {
166 |         let lens_radius = aperture * 0.5;
167 | 
168 |         let half_h = (vfov * 0.5).tan();
169 |         let half_w = aspect * half_h;
170 | 
171 |         let origin = from;
172 |         let w = unit_vector(from - to);
173 |         let u = unit_vector(vup.cross(w));
174 |         let v = w.cross(u);
175 | 
176 |         let lower_left_corner = origin
177 |             - half_w * focus_dist * u
178 |             - half_h * focus_dist * v
179 |             - focus_dist * w;
180 |         let horizontal = u * 2.0 * half_w * focus_dist;
181 |         let vertical = v * 2.0 * half_h * focus_dist;
182 | 
183 |         Self {
184 |             lower_left_corner,
185 |             origin,
186 |             horizontal,
187 |             vertical,
188 |             u,
189 |             v,
190 |             w,
191 |             lens_radius,
192 |         }
193 |     }
194 | 
195 |     pub fn ray(&self, rng: &mut Rng, uv: Vec2) -> Ray {
196 |         let rd = self.lens_radius * random_in_unit_disk(rng);
197 |         let offset = self.u * rd.x + self.v * rd.y;
198 |         Ray {
199 |             a: self.origin + offset,
200 |             b: self.lower_left_corner + uv.x * self.horizontal + uv.y * self.vertical - self.origin - offset,
201 |         }
202 |     }
203 | }
204 | 
205 | impl Ray {
206 |     pub fn new(a: Vec3, b: Vec3) -> Self {
207 |         Ray { a, b }
208 |     }
209 | 
210 |     pub fn origin(&self) -> Vec3 {
211 |         self.a
212 |     }
213 | 
214 |     pub fn direction(&self) -> Vec3 {
215 |         self.b
216 |     }
217 | 
218 |     pub fn point_at_parameter(&self, t: f32) -> Vec3 {
219 |         self.a + self.b * t
220 |     }
221 | }
222 | 
223 | impl Rng {
224 |     pub fn gen_signed(&mut self) -> f32 {
225 |         let res = (self.seed.dot(vec2(12.9898, 78.233)).sin() * 43758.5453).fract();
226 |         self.seed = vec2(
227 |             (self.seed.x + res + 17.825) % 3718.0,
228 |             (self.seed.y + res + 72.7859) % 1739.0,
229 |         );
230 |         res
231 |     }
232 | 
233 |     pub fn gen(&mut self) -> f32 {
234 |         self.gen_signed() * 0.5 + 0.5
235 |     }
236 | }
237 | 
238 | impl Lambertian {
239 |     pub fn new(albedo: Vec3) -> Self {
240 |         Self { albedo }
241 |     }
242 | 
243 |     pub fn scatter_ray(
244 |         &self,
245 |         hit: &HitData,
246 |         rng: &mut Rng,
247 |         attenuation: &mut Vec3,
248 |         r_out: &mut Ray,
249 |     ) {
250 |         let target = hit.p + hit.normal + random_in_unit_sphere(rng);
251 |         *r_out = Ray::new(hit.p, target - hit.p);
252 |         *attenuation = self.albedo;
253 |     }
254 | }
255 | 
256 | impl Metal {
257 |     pub fn new(albedo: Vec3, fuzz: f32) -> Self {
258 |         Self { albedo, fuzz }
259 |     }
260 | }
261 | 
262 | impl Dielectric {
263 |     pub fn new(ref_idx: f32) -> Self {
264 |         Self { ref_idx: Vec3::splat(ref_idx) }
265 |     }
266 | }
267 | 
268 | impl<T: Copy + Hit, const N: usize> Hit for [T; N] {
269 |     fn hit(self, r: &Ray, t_min: f32, t_max: f32, hit: &mut HitData) -> bool {
270 |         let mut did_hit = false;
271 |         let mut closest_t = t_max;
272 |         let mut temp_hit = HitData::default();
273 |         for i in 0..N {
274 |             if self[i].hit(r, t_min, closest_t, &mut temp_hit) {
275 |                 did_hit = true;
276 |                 closest_t = temp_hit.t;
277 |                 *hit = temp_hit;
278 |             }
279 |         }
280 |         did_hit
281 |     }
282 | }
283 | 
284 | impl Hit for Sphere {
285 |     fn hit(self, r: &Ray, t_min: f32, t_max: f32, hit: &mut HitData) -> bool {
286 |         (&self).hit(r, t_min, t_max, hit)
287 |     }
288 | }
289 | 
290 | impl<'a> Hit for &'a Sphere {
291 |     fn hit(self, r: &Ray, t_min: f32, t_max: f32, hit: &mut HitData) -> bool {
292 |         let Sphere { center, radius, material } = *self;
293 |         let origin = r.origin();
294 |         let direction = r.direction();
295 |         let oc = origin - center;
296 |         let a = direction.dot(direction);
297 |         let b = oc.dot(direction);
298 |         let c = oc.dot(oc) - radius * radius;
299 |         let discriminant = b * b - a * c;
300 |         if discriminant > 0.0 {
301 |             let mut temp = (-b - (b * b - a * c).sqrt()) / a;
302 |             if temp < t_max && temp > t_min {
303 |                 hit.t = temp;
304 |                 hit.p = r.point_at_parameter(hit.t);
305 |                 hit.normal = (hit.p - center) / radius;
306 |                 hit.material = material;
307 |                 return true;
308 |             }
309 |             temp = (-b + (b * b - a * c).sqrt()) / a;
310 |             if temp < t_max && temp > t_min {
311 |                 hit.t = temp;
312 |                 hit.p = r.point_at_parameter(hit.t);
313 |                 hit.normal = (hit.p - center) / radius;
314 |                 hit.material = material;
315 |                 return true;
316 |             }
317 |         }
318 |         false
319 |     }
320 | }
321 | 
322 | impl Material for Lambertian {
323 |     fn scatter(
324 |         self,
325 |         _: &Ray,
326 |         hit: &HitData,
327 |         rng: &mut Rng,
328 |         attenuation: &mut Vec3,
329 |         ray_out: &mut Ray,
330 |     ) -> bool {
331 |         self.scatter_ray(hit, rng, attenuation, ray_out);
332 |         true
333 |     }
334 | }
335 | 
336 | impl Material for Metal {
337 |     fn scatter(
338 |         self,
339 |         ray_in: &Ray,
340 |         hit: &HitData,
341 |         rng: &mut Rng,
342 |         attenuation: &mut Vec3,
343 |         ray_out: &mut Ray,
344 |     ) -> bool {
345 |         let reflected = reflect(unit_vector(ray_in.direction()), hit.normal);
346 |         *ray_out = Ray::new(hit.p, reflected + self.fuzz * random_in_unit_sphere(rng));
347 |         *attenuation = self.albedo;
348 |         ray_out.direction().dot(hit.normal) > 0.0
349 |     }
350 | }
351 | 
352 | impl Material for Dielectric {
353 |     fn scatter(
354 |         self,
355 |         ray_in: &Ray,
356 |         hit: &HitData,
357 |         rng: &mut Rng,
358 |         attenuation: &mut Vec3,
359 |         ray_out: &mut Ray,
360 |     ) -> bool {
361 |         let ray_in_dir = ray_in.direction();
362 |         let reflected = reflect(ray_in_dir, hit.normal);
363 |         *attenuation = Vec3::ONE;
364 |         let ray_in_dir_dot_normal = ray_in_dir.dot(hit.normal);
365 |         let (outward_normal, ni_over_nt, cos) = if ray_in_dir_dot_normal > 0.0 {
366 |             let cos = self.ref_idx.x * ray_in_dir_dot_normal / ray_in_dir.length();
367 |             (-hit.normal, self.ref_idx.x, cos)
368 |         } else {
369 |             let cos = -ray_in_dir_dot_normal / ray_in_dir.length();
370 |             (hit.normal, 1.0 / self.ref_idx.x, cos)
371 |         };
372 |         let mut refracted = Vec3::ZERO;
373 |         let reflect_prob = if refract(ray_in.direction(), outward_normal, ni_over_nt, &mut refracted) {
374 |             schlick(cos, self.ref_idx.x)
375 |         } else {
376 |             1.0
377 |         };
378 |         if rng.gen() < reflect_prob {
379 |             *ray_out = Ray::new(hit.p, reflected);
380 |         } else {
381 |             *ray_out = Ray::new(hit.p, refracted);
382 |         }
383 |         true
384 |     }
385 | }
386 | 
387 | impl<'a, const NL: usize, const NM: usize, const ND: usize> Material for &'a Materials<NL, NM, ND> {
388 |     fn scatter(
389 |         self,
390 |         ray_in: &Ray,
391 |         hit: &HitData,
392 |         rng: &mut Rng,
393 |         attenuation: &mut Vec3,
394 |         ray_out: &mut Ray,
395 |     ) -> bool {
396 |         match hit.material.kind {
397 |             MaterialKind::Lambertian => {
398 |                 self.lambertian[hit.material.index].scatter(ray_in, hit, rng, attenuation, ray_out)
399 |             }
400 |             MaterialKind::Metal => {
401 |                 self.metal[hit.material.index].scatter(ray_in, hit, rng, attenuation, ray_out)
402 |             }
403 |             MaterialKind::Dielectric => {
404 |                 self.dielectric[hit.material.index].scatter(ray_in, hit, rng, attenuation, ray_out)
405 |             }
406 |         }
407 |     }
408 | }
409 | 
410 | impl Default for MaterialInfo {
411 |     fn default() -> Self {
412 |         let kind = Default::default();
413 |         let index = 0;
414 |         MaterialInfo { kind, index }
415 |     }
416 | }
417 | 
418 | impl Default for MaterialKind {
419 |     fn default() -> Self {
420 |         MaterialKind::Lambertian
421 |     }
422 | }
423 | 
424 | pub fn unit_vector(v: Vec3) -> Vec3 {
425 |     v / v.length()
426 | }
427 | 
428 | fn random_in_unit_sphere(rng: &mut Rng) -> Vec3 {
429 |     let mut p;
430 |     loop {
431 |         let rv = vec3(rng.gen(), rng.gen(), rng.gen());
432 |         p = 2.0 * rv - Vec3::ONE;
433 |         let p_len2 = p.length_squared();
434 |         if p_len2 < 1.0 {
435 |             break p;
436 |         }
437 |     }
438 | }
439 | 
440 | fn random_in_unit_disk(rng: &mut Rng) -> Vec3 {
441 |     let mut p;
442 |     loop {
443 |         let rv = vec3(rng.gen(), rng.gen(), 0.0);
444 |         p = 2.0 * rv - vec3(1.0, 1.0, 0.0);
445 |         if p.dot(p) < 1.0 {
446 |             break p;
447 |         }
448 |     }
449 | }
450 | 
451 | pub fn reflect(v: Vec3, n: Vec3) -> Vec3 {
452 |     v - 2.0 * v.dot(n) * n
453 | }
454 | 
455 | pub fn refract(v: Vec3, n: Vec3, ni_over_nt: f32, refracted: &mut Vec3) -> bool {
456 |     let uv = unit_vector(v);
457 |     let dt = uv.dot(n);
458 |     let discriminant = 1.0 - ni_over_nt * ni_over_nt * (1.0 - dt * dt);
459 |     if discriminant > 0.0 {
460 |         *refracted = ni_over_nt * (uv - n * dt) - n * discriminant.sqrt();
461 |         true
462 |     } else {
463 |         false
464 |     }
465 | }
466 | 
467 | pub fn schlick(cos: f32, ref_idx: f32) -> f32 {
468 |     let mut r0 = (1.0 - ref_idx) / (1.0 + ref_idx);
469 |     r0 = r0 * r0;
470 |     r0 + (1.0 - r0) * (1.0 - cos).powf(5.0)
471 | }
472 | 
473 | pub fn color(
474 |     ray_bounce_limit: u32,
475 |     rng: &mut Rng,
476 |     mut ray: Ray,
477 |     world: impl Copy + Hit,
478 |     materials: impl Copy + Material,
479 | ) -> Vec3 {
480 |     let mut hit = HitData::default();
481 |     let mut scattered = Ray::new(Vec3::ZERO, Vec3::ONE); // placeholder to initialise.
482 |     let mut attenuation = Vec3::default();
483 | 
484 |     let min_f = 0.001;
485 |     let max_f = core::f32::MAX;
486 |     let mut color = Vec3::ONE;
487 |     let mut bounces = 0;
488 |     while world.hit(&ray, min_f, max_f, &mut hit) {
489 |         if bounces < ray_bounce_limit && materials.scatter(&ray, &hit, rng, &mut attenuation, &mut scattered) {
490 |             color *= attenuation;
491 |             ray = scattered;
492 |         } else {
493 |             color = Vec3::ZERO;
494 |             break;
495 |         }
496 |         bounces += 1;
497 |     }
498 | 
499 |     let sky = color_sky(&ray);
500 |     sky * color
501 | }
502 | 
503 | fn color_sky(ray: &Ray) -> Vec3 {
504 |     let unit_direction = unit_vector(ray.direction()) * 2.0;
505 |     let t = 0.5 * (unit_direction.y + 1.0);
506 |     (1.0 - t) * vec3(1.0, 1.0, 1.0) + t * vec3(0.5, 0.7, 1.0)
507 | }
508 | 


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