From 5968c29b65a87c48fe3bec2af824417c53865e16 Mon Sep 17 00:00:00 2001
From: Caspar Krieger <git@asparck.com>
Date: Tue, 2 Nov 2021 20:09:58 +0800
Subject: [PATCH] Basic scaffolding for displaying an image in a UI

Copied over from the all-seeing-crab raytracer I wrote in the past -
using channels to send freshly allocated vectors back and forth is
certainly not the most efficient way to display a rendered texture, but
this will do for now.
---
 .gitignore  |    1 +
 Cargo.lock  | 2098 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   16 +
 README.md   |   15 +
 src/main.rs |   93 +++
 src/ui.rs   |  259 +++++++
 6 files changed, 2482 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
 create mode 100644 src/ui.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..3f29377
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+ "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 0.12.3",
+ "wayland-client 0.28.6",
+ "winapi",
+ "x11-dl",
+]
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+ "libc",
+ "pkg-config",
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+dependencies = [
+ "nom",
+]
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+[[package]]
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+checksum = "3a23fe958c70412687039c86f578938b4a0bb50ec788e96bce4d6ab00ddd5803"
+dependencies = [
+ "dirs",
+]
+
+[[package]]
+name = "xml-rs"
+version = "0.8.4"
+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..080449f
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "crab-tv"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+derive_more = "0.99.9"
+rgb = "0.8.25"
+lodepng = "3.4"
+rand = "0.7.3"
+flume = "0.8.4"
+eframe = { version = "0.14.0", features = ["persistence"] }
+egui = "0.14.2"
+serde = { version = "1.0", features = ["derive"] }
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0a379de
--- /dev/null
+++ b/README.md
@@ -0,0 +1,15 @@
+# Crab TV
+
+A rasterizing software renderer, written in the spirit of https://github.com/ssloy/tinyrenderer
+
+## Prereqs
+
+* Rust, obviously
+* eframe dependencies: `sudo apt-get install libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libspeechd-dev libxkbcommon-dev libssl-dev`
+* `cargo-watch` for devloop: `cargo install cargo-watch`
+
+## Developing
+
+```
+cargo watch -x run
+```
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..639ae1a
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,93 @@
+#![deny(clippy::all)] // make all clippy warnings into errors
+#![allow(clippy::many_single_char_names)]
+
+mod ui;
+
+use rgb::RGB8;
+
+#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
+#[serde(default)] // if we add new fields, give them default values when deserializing old state
+struct RenderConfig {
+    image_width: usize,
+    image_height: usize,
+    output_filename: String,
+    display_actual_size: bool,
+}
+
+impl RenderConfig {
+    pub(crate) fn image_pixel_count(&self) -> usize {
+        self.image_width * self.image_height
+    }
+}
+
+impl Default for RenderConfig {
+    fn default() -> Self {
+        let aspect_ratio = 16.0 / 9.0;
+        let image_width = 400;
+        Self {
+            image_width,
+            image_height: (image_width as f64 / aspect_ratio) as usize,
+            output_filename: "target/output.png".to_owned(),
+            display_actual_size: true,
+        }
+    }
+}
+
+enum RenderCommand {
+    Render { config: RenderConfig },
+}
+
+enum RenderResult {
+    Reset {
+        image_width: usize,
+        image_height: usize,
+    },
+    FullImage {
+        pixels: Vec<RGB8>,
+    },
+}
+
+fn main() {
+    let (command_tx, command_rx) = flume::unbounded::<RenderCommand>();
+    let (result_tx, result_rx) = flume::unbounded::<RenderResult>();
+
+    // start a background thread to handle rendering, but drop its handle so we don't wait for it
+    // to finish
+    drop(std::thread::spawn(move || {
+        run_render_loop(command_rx, result_tx);
+    }));
+
+    let app = ui::TemplateApp::new(command_tx, result_rx);
+    let native_options = eframe::NativeOptions::default();
+    eframe::run_native(Box::new(app), native_options);
+}
+
+fn run_render_loop(
+    render_command_rx: flume::Receiver<RenderCommand>,
+    render_result_tx: flume::Sender<RenderResult>,
+) {
+    loop {
+        match render_command_rx.recv() {
+            Err(flume::RecvError::Disconnected) => break, // nothing to do, just quit quietly
+
+            Ok(RenderCommand::Render { config }) => {
+                render_result_tx
+                    .send(RenderResult::Reset {
+                        image_height: config.image_height,
+                        image_width: config.image_width,
+                    })
+                    .ok()
+                    .expect("sending Reset should succeed");
+
+                let mut pixels = vec![RGB8::new(0, 0, 0); config.image_pixel_count()];
+
+                pixels[config.image_width * config.image_height / 2] = RGB8::new(255, 0, 0);
+
+                render_result_tx
+                    .send(RenderResult::FullImage { pixels })
+                    .ok()
+                    .unwrap();
+            }
+        }
+    }
+}
diff --git a/src/ui.rs b/src/ui.rs
new file mode 100644
index 0000000..03f69c4
--- /dev/null
+++ b/src/ui.rs
@@ -0,0 +1,259 @@
+use eframe::{
+    egui::{self, TextureId},
+    epi,
+};
+use rgb::RGB8;
+
+use crate::{RenderCommand, RenderConfig, RenderResult};
+
+#[derive(Debug, Default)]
+struct UiData {
+    last_render_width: usize,
+    last_render_height: usize,
+    last_render_pixels: Vec<RGB8>,
+    last_render_tex: Option<TextureId>,
+}
+
+impl UiData {
+    fn new(width: usize, height: usize) -> Self {
+        Self {
+            last_render_width: width,
+            last_render_height: height,
+            last_render_pixels: vec![RGB8 { r: 0, g: 0, b: 0 }; width * height],
+            ..Default::default()
+        }
+    }
+
+    fn clear_texture(&mut self, tex_allocator: &mut dyn eframe::epi::TextureAllocator) {
+        if let Some(existing_tex) = self.last_render_tex {
+            tex_allocator.free(existing_tex);
+            self.last_render_tex = None;
+        }
+    }
+
+    fn store_image(
+        &mut self,
+        pixels: &[RGB8],
+        tex_allocator: &mut dyn eframe::epi::TextureAllocator,
+    ) {
+        assert_eq!(
+            pixels.len(),
+            self.last_render_width * self.last_render_height
+        );
+
+        self.last_render_pixels = pixels.iter().copied().collect();
+
+        if let Some(existing_tex) = self.last_render_tex {
+            tex_allocator.free(existing_tex);
+        }
+        let tex_pixels = self
+            .last_render_pixels
+            .iter()
+            .map(|rgb| egui::Color32::from_rgba_premultiplied(rgb.r, rgb.g, rgb.b, 255))
+            .collect::<Vec<_>>();
+        self.last_render_tex = Some(tex_allocator.alloc_srgba_premultiplied(
+            (self.last_render_width, self.last_render_height),
+            &tex_pixels,
+        ));
+    }
+
+    fn save_output_to_file(&self, output_filename: &str) {
+        // make sure we got all the data we should have
+        assert_eq!(
+            self.last_render_pixels.len(),
+            self.last_render_width * self.last_render_height
+        );
+
+        print!(
+            "Saving completed image to disk at {} in PNG format...",
+            output_filename
+        );
+        lodepng::encode_file(
+            output_filename,
+            &self.last_render_pixels,
+            self.last_render_width,
+            self.last_render_height,
+            lodepng::ColorType::RGB,
+            8,
+        )
+        .expect("Encoding result and saving to disk failed");
+
+        println!(" done saving.");
+    }
+}
+
+#[derive(Debug)]
+pub struct TemplateApp {
+    config: RenderConfig,
+    data: Option<UiData>,
+
+    render_command_tx: flume::Sender<RenderCommand>,
+    render_result_rx: flume::Receiver<RenderResult>,
+}
+
+impl TemplateApp {
+    pub(crate) fn new(
+        render_command_tx: flume::Sender<RenderCommand>,
+        render_result_rx: flume::Receiver<RenderResult>,
+    ) -> Self {
+        TemplateApp {
+            config: Default::default(),
+            data: Default::default(),
+            render_command_tx,
+            render_result_rx,
+        }
+    }
+
+    fn trigger_render(&self) {
+        println!(
+            "Triggering render of {width}x{height} image (total {count} pixels)",
+            width = self.config.image_width,
+            height = self.config.image_height,
+            count = self.config.image_pixel_count(),
+        );
+
+        self.render_command_tx
+            .send(RenderCommand::Render {
+                config: self.config.clone(),
+            })
+            .ok()
+            .expect("render command send should succeed");
+    }
+}
+
+impl epi::App for TemplateApp {
+    fn name(&self) -> &str {
+        "Crab TV"
+    }
+
+    /// Called once before the first frame.
+    fn setup(
+        &mut self,
+        _ctx: &egui::CtxRef,
+        _frame: &mut epi::Frame<'_>,
+        _storage: Option<&dyn epi::Storage>,
+    ) {
+        // Load previous app state (if any).
+        if let Some(storage) = _storage {
+            self.config = epi::get_value(storage, epi::APP_KEY).unwrap_or_default()
+        }
+
+        self.trigger_render();
+    }
+
+    /// Called by the frame work to save state before shutdown.
+    fn save(&mut self, storage: &mut dyn epi::Storage) {
+        epi::set_value(storage, epi::APP_KEY, &self.config);
+    }
+
+    /// Called each time the UI needs repainting, which may be many times per second.
+    /// Put your widgets into a `SidePanel`, `TopPanel`, `CentralPanel`, `Window` or `Area`.
+    fn update(&mut self, ctx: &egui::CtxRef, frame: &mut epi::Frame<'_>) {
+        loop {
+            match self.render_result_rx.try_recv() {
+                Ok(RenderResult::Reset {
+                    image_height,
+                    image_width,
+                }) => {
+                    assert!(image_width > 0);
+                    assert!(image_height > 0);
+
+                    if let Some(ref mut d) = self.data {
+                        d.clear_texture(frame.tex_allocator());
+                    }
+                    self.data = Some(UiData::new(image_width, image_height));
+                }
+                Ok(RenderResult::FullImage { pixels }) => {
+                    let data = self
+                        .data
+                        .as_mut()
+                        .expect("ui data must be present for storing pixels");
+
+                    data.store_image(pixels.as_slice(), frame.tex_allocator());
+
+                    data.save_output_to_file(self.config.output_filename.as_ref());
+                }
+                Err(flume::TryRecvError::Empty) => break,
+                Err(flume::TryRecvError::Disconnected) => {
+                    panic!("Rendering thread seems to have exited before UI!")
+                }
+            };
+        }
+
+        egui::SidePanel::left("config_panel")
+            // .resizable(false)
+            .show(ctx, |ui| {
+                egui::ScrollArea::auto_sized().show(ui, |ui| {
+                    ui.spacing_mut().item_spacing = egui::Vec2::new(8.0, 8.0);
+
+                    ui.heading("Render Configuration");
+                    egui::warn_if_debug_build(ui);
+                    ui.end_row();
+
+                    ui.horizontal(|ui| {
+                        ui.label("Save as");
+                        ui.text_edit_singleline(&mut self.config.output_filename);
+                    });
+                    ui.end_row();
+
+                    ui.vertical_centered_justified(|ui| {
+                        let button = egui::widgets::Button::new("Render image!");
+                        if ui.add(button).clicked() {
+                            self.trigger_render();
+                        }
+                    });
+                    ui.end_row();
+
+                    ui.collapsing("Graphical display options", |ui| {
+                        ui.checkbox(
+                            &mut self.config.display_actual_size,
+                            "Display render at actual 1:1 size",
+                        );
+                    });
+
+                    ui.collapsing("Rendering options", |ui| {
+                        ui.collapsing("Reset to default", |ui| {
+                            if ui.button("Load default render settings").clicked() {
+                                self.config = RenderConfig::default();
+                            }
+                        });
+
+                        ui.add(
+                            egui::Slider::new(&mut self.config.image_width, 1..=1000)
+                                .suffix("px")
+                                .text("Image width"),
+                        );
+                        ui.end_row();
+
+                        ui.add(
+                            egui::Slider::new(&mut self.config.image_height, 1..=1000)
+                                .suffix("px")
+                                .text("Image height"),
+                        );
+                        ui.end_row();
+                    });
+                })
+            });
+
+        egui::CentralPanel::default().show(ctx, |ui| {
+            if let Some(ref mut data) = self.data {
+                let image_sizing = if self.config.display_actual_size {
+                    egui::Vec2::new(
+                        data.last_render_width as f32,
+                        data.last_render_height as f32,
+                    )
+                } else {
+                    let mut available = ui.available_size();
+                    available.y -= 25.0;
+                    available
+                };
+
+                egui::ScrollArea::auto_sized().show(ui, |ui| {
+                    if let Some(tex_id) = data.last_render_tex {
+                        ui.image(tex_id, image_sizing);
+                    }
+                });
+            }
+        });
+    }
+}