├── .gitignore
├── Cargo.lock
├── Cargo.toml
├── README.md
├── examples
    └── lorenz.rs
├── shell.nix
└── src
    ├── lib.rs
    └── line_shader.wgsl


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


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2149 | checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
2150 | 
2151 | [[package]]
2152 | name = "windows_x86_64_msvc"
2153 | version = "0.36.1"
2154 | source = "registry+https://github.com/rust-lang/crates.io-index"
2155 | checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"
2156 | 
2157 | [[package]]
2158 | name = "winit"
2159 | version = "0.27.3"
2160 | source = "registry+https://github.com/rust-lang/crates.io-index"
2161 | checksum = "a22e94ba35ca3ff11820044bfa0dc48b95a3a15569c0068555566a12ef41c9e5"
2162 | dependencies = [
2163 |  "bitflags",
2164 |  "cocoa",
2165 |  "core-foundation",
2166 |  "core-graphics",
2167 |  "dispatch",
2168 |  "instant",
2169 |  "libc",
2170 |  "log",
2171 |  "mio",
2172 |  "ndk 0.7.0",
2173 |  "ndk-glue 0.7.0",
2174 |  "objc",
2175 |  "once_cell",
2176 |  "parking_lot",
2177 |  "percent-encoding",
2178 |  "raw-window-handle 0.4.3",
2179 |  "raw-window-handle 0.5.0",
2180 |  "sctk-adwaita",
2181 |  "smithay-client-toolkit",
2182 |  "wasm-bindgen",
2183 |  "wayland-client",
2184 |  "wayland-protocols",
2185 |  "web-sys",
2186 |  "windows-sys",
2187 |  "x11-dl",
2188 | ]
2189 | 
2190 | [[package]]
2191 | name = "wio"
2192 | version = "0.2.2"
2193 | source = "registry+https://github.com/rust-lang/crates.io-index"
2194 | checksum = "5d129932f4644ac2396cb456385cbf9e63b5b30c6e8dc4820bdca4eb082037a5"
2195 | dependencies = [
2196 |  "winapi",
2197 | ]
2198 | 
2199 | [[package]]
2200 | name = "x11-dl"
2201 | version = "2.20.0"
2202 | source = "registry+https://github.com/rust-lang/crates.io-index"
2203 | checksum = "0c83627bc137605acc00bb399c7b908ef460b621fc37c953db2b09f88c449ea6"
2204 | dependencies = [
2205 |  "lazy_static",
2206 |  "libc",
2207 |  "pkg-config",
2208 | ]
2209 | 
2210 | [[package]]
2211 | name = "x11rb"
2212 | version = "0.10.1"
2213 | source = "registry+https://github.com/rust-lang/crates.io-index"
2214 | checksum = "592b4883219f345e712b3209c62654ebda0bb50887f330cbd018d0f654bfd507"
2215 | dependencies = [
2216 |  "gethostname",
2217 |  "nix",
2218 |  "winapi",
2219 |  "winapi-wsapoll",
2220 |  "x11rb-protocol",
2221 | ]
2222 | 
2223 | [[package]]
2224 | name = "x11rb-protocol"
2225 | version = "0.10.0"
2226 | source = "registry+https://github.com/rust-lang/crates.io-index"
2227 | checksum = "56b245751c0ac9db0e006dc812031482784e434630205a93c73cfefcaabeac67"
2228 | dependencies = [
2229 |  "nix",
2230 | ]
2231 | 
2232 | [[package]]
2233 | name = "xcursor"
2234 | version = "0.3.4"
2235 | source = "registry+https://github.com/rust-lang/crates.io-index"
2236 | checksum = "463705a63313cd4301184381c5e8042f0a7e9b4bb63653f216311d4ae74690b7"
2237 | dependencies = [
2238 |  "nom",
2239 | ]
2240 | 
2241 | [[package]]
2242 | name = "xml-rs"
2243 | version = "0.8.4"
2244 | source = "registry+https://github.com/rust-lang/crates.io-index"
2245 | checksum = "d2d7d3948613f75c98fd9328cfdcc45acc4d360655289d0a7d4ec931392200a3"
2246 | 


--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "egui_gpu_plot"
 3 | version = "0.1.0"
 4 | edition = "2021"
 5 | 
 6 | [[example]]
 7 | name = "lorenz"
 8 | 
 9 | [dependencies]
10 | bytemuck = "1.12"
11 | 
12 | egui = { git =  "https://github.com/emilk/egui" }
13 | egui-wgpu = { git =  "https://github.com/emilk/egui" }
14 | wgpu = "0.13"
15 | 
16 | [dev-dependencies]
17 | eframe = { git = "https://github.com/emilk/egui", features = ["wgpu"] }
18 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # egui_wgpu_plot
 2 | 
 3 | Experiments in rendering 2D line plots in egui directly on the GPU with minimal
 4 | copying.
 5 | 
 6 | ## Demo
 7 | 
 8 |     cargo run --release --example lorenz
 9 | 
10 | https://user-images.githubusercontent.com/233860/192120927-0761b56c-a50e-4ee9-a7ab-147b3b3c04e0.mp4
11 | 
12 | ## Theory
13 | 
14 | In order to achieve realtime rendering performance on large datasets (1M+
15 | points), the transformation from data-space to screen-space is performed on the
16 | GPU. This means that GPU vertex buffers are only updated if the data changes,
17 | not when the view is panned or zoomed.
18 | 
19 | In order to draw nice-looking lines, the approach described in [Drawing
20 | Antialiased Lines with OpenGL][1] is used. Duplicate vertices are provided to
21 | the GPU, one with each normal vector of the line at that point. This is provided
22 | to the shader as a triangle strip, which then offsets the vertices along their
23 | normals to add line width and feathers the edge for anti-aliasing.
24 | 
25 | ![](https://miro.medium.com/max/640/0*8ZZJdx9kleLSsT_Z.png)
26 | 
27 | [1]: https://blog.mapbox.com/drawing-antialiased-lines-with-opengl-8766f34192dc
28 | 


--------------------------------------------------------------------------------
/examples/lorenz.rs:
--------------------------------------------------------------------------------
  1 | use std::sync::Arc;
  2 | 
  3 | use eframe::egui::plot::{Legend, PlotImage};
  4 | use eframe::egui::{self, plot::PlotBounds};
  5 | use eframe::emath::Vec2;
  6 | use wgpu;
  7 | 
  8 | use egui_gpu_plot::*;
  9 | 
 10 | const MAX_POINTS: usize = 1_000_000;
 11 | 
 12 | pub struct GpuPlot {
 13 |     q: [f32; 3],
 14 | 
 15 |     show_cpu: bool,
 16 |     show_gpu: bool,
 17 | 
 18 |     dirty: bool,
 19 |     texture_id: egui::TextureId,
 20 |     points: Arc<Vec<Vertex>>,
 21 | }
 22 | 
 23 | impl GpuPlot {
 24 |     pub fn new<'a>(cc: &'a eframe::CreationContext<'a>) -> Option<Self> {
 25 |         let wgpu_render_state = cc.wgpu_render_state.as_ref()?;
 26 | 
 27 |         let device = &wgpu_render_state.device;
 28 |         let target_format = wgpu_render_state.target_format;
 29 | 
 30 |         let plot = GpuAcceleratedPlot::new(device, target_format);
 31 |         let texture_id = {
 32 |             let mut renderer = wgpu_render_state.renderer.write();
 33 |             renderer.register_native_texture(device, &plot.create_view(), wgpu::FilterMode::Linear)
 34 |         };
 35 | 
 36 |         wgpu_render_state
 37 |             .renderer
 38 |             .write()
 39 |             .paint_callback_resources
 40 |             .insert(plot);
 41 | 
 42 |         let q = [10.0, 28.0, 8.0 / 3.0];
 43 |         Some(Self {
 44 |             q,
 45 |             show_cpu: false,
 46 |             show_gpu: true,
 47 |             dirty: true,
 48 |             texture_id,
 49 |             points: Arc::new(forward_euler(lorenz, q, MAX_POINTS)),
 50 |         })
 51 |     }
 52 | }
 53 | 
 54 | fn lorenz(q: [f32; 3], s: [f32; 3]) -> [f32; 3] {
 55 |     let sigma = q[0];
 56 |     let rho = q[1];
 57 |     let beta = q[2];
 58 | 
 59 |     [
 60 |         sigma * (s[1] - s[0]),
 61 |         s[0] * (rho - s[2]) - s[1],
 62 |         s[0] * s[1] - beta * s[2],
 63 |     ]
 64 | }
 65 | 
 66 | fn forward_euler<F>(df: F, q: [f32; 3], n: usize) -> Vec<Vertex>
 67 | where
 68 |     F: Fn([f32; 3], [f32; 3]) -> [f32; 3],
 69 | {
 70 |     let tf = 1000.0;
 71 |     let dt = tf / n as f32;
 72 | 
 73 |     let mut s = [1.0, 0.0, 0.0];
 74 |     let mut vs = Vec::with_capacity(n);
 75 | 
 76 |     for i in 0..n {
 77 |         let pct = i as f32 / n as f32;
 78 | 
 79 |         let ds = df(q, s);
 80 |         for j in 0..s.len() {
 81 |             s[j] += ds[j] * dt;
 82 |         }
 83 | 
 84 |         let position = [s[0], s[2]];
 85 |         let normal = egui::Vec2::new(ds[0], ds[2]).normalized().rot90();
 86 |         let color = egui::color::Hsva::new(pct, 0.85, 0.5, 1.0).to_rgba_premultiplied();
 87 | 
 88 |         vs.push(Vertex {
 89 |             position,
 90 |             normal: [normal.x, normal.y],
 91 |             color,
 92 |         });
 93 |         // two vertices per
 94 |         vs.push(Vertex {
 95 |             position,
 96 |             normal: [-normal.x, -normal.y],
 97 |             color,
 98 |         });
 99 |     }
100 | 
101 |     vs
102 | }
103 | 
104 | impl eframe::App for GpuPlot {
105 |     fn update(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
106 |         egui::CentralPanel::default().show(ctx, |ui| {
107 |             let mut new_sigma = self.q[0];
108 |             let mut new_rho = self.q[1];
109 |             let mut new_beta = self.q[2];
110 | 
111 |             ui.horizontal(|ui| {
112 |                 for (l, v, range) in [
113 |                     ("σ", &mut new_sigma, 0.0..=20.0),
114 |                     ("ρ", &mut new_rho, 0.0..=50.0),
115 |                     ("β", &mut new_beta, 0.0..=10.0),
116 |                 ] {
117 |                     ui.label(l);
118 |                     ui.add(egui::Slider::new(v, range).step_by(0.01));
119 |                 }
120 | 
121 |                 ui.toggle_value(&mut self.show_cpu, "CPU");
122 |                 ui.toggle_value(&mut self.show_gpu, "GPU");
123 |             });
124 | 
125 |             if self.q != [new_sigma, new_rho, new_beta] {
126 |                 self.q = [new_sigma, new_rho, new_beta];
127 | 
128 |                 self.points = Arc::new(forward_euler(lorenz, self.q, MAX_POINTS));
129 |                 self.dirty = true;
130 |             }
131 | 
132 |             let mut bounds = PlotBounds::NOTHING;
133 |             let resp = egui::plot::Plot::new("my_plot")
134 |                 .legend(Legend::default())
135 |                 // Must set margins to zero or the image and plot bounds will
136 |                 // constantly fight, expanding the plot to infinity.
137 |                 .set_margin_fraction(Vec2::new(0.0, 0.0))
138 |                 .include_x(-25.0)
139 |                 .include_x(25.0)
140 |                 .include_y(0.0)
141 |                 .include_y(60.0)
142 |                 .show(ui, |ui| {
143 |                     bounds = ui.plot_bounds();
144 | 
145 |                     if self.show_gpu {
146 |                         // Render the plot texture filling the viewport.
147 |                         ui.image(
148 |                             PlotImage::new(
149 |                                 self.texture_id,
150 |                                 bounds.center(),
151 |                                 [bounds.width() as f32, bounds.height() as f32],
152 |                             )
153 |                             .name("Lorenz attractor (GPU)"),
154 |                         );
155 |                     }
156 | 
157 |                     if self.show_cpu {
158 |                         ui.line(
159 |                             egui::plot::Line::new(egui::plot::PlotPoints::from_iter(
160 |                                 self.points
161 |                                     .iter()
162 |                                     .map(|p| [p.position[0] as f64, p.position[1] as f64]),
163 |                             ))
164 |                             .name("Lorenz attractor (CPU)"),
165 |                         );
166 |                     }
167 |                 });
168 | 
169 |             if self.show_gpu {
170 |                 // Add a callback to egui to render the plot contents to
171 |                 // texture.
172 |                 ui.painter().add(egui_wgpu_callback(
173 |                     bounds,
174 |                     Arc::clone(&self.points),
175 |                     resp.response.rect,
176 |                     self.dirty,
177 |                 ));
178 | 
179 |                 // Update the texture handle in egui from the previously
180 |                 // rendered texture (from the last frame).
181 |                 let wgpu_render_state = frame.wgpu_render_state().unwrap();
182 |                 let mut renderer = wgpu_render_state.renderer.write();
183 | 
184 |                 let plot: &GpuAcceleratedPlot = renderer.paint_callback_resources.get().unwrap();
185 |                 let texture_view = plot.create_view();
186 | 
187 |                 renderer.update_egui_texture_from_wgpu_texture(
188 |                     &wgpu_render_state.device,
189 |                     &texture_view,
190 |                     wgpu::FilterMode::Linear,
191 |                     self.texture_id,
192 |                 );
193 | 
194 |                 self.dirty = false;
195 |             }
196 |         });
197 |     }
198 | }
199 | 
200 | fn main() {
201 |     let native_options = eframe::NativeOptions {
202 |         renderer: eframe::Renderer::Wgpu,
203 |         ..Default::default()
204 |     };
205 | 
206 |     eframe::run_native(
207 |         "GPU Accelerated Plotter",
208 |         native_options,
209 |         Box::new(|cc| Box::new(GpuPlot::new(cc).unwrap())),
210 |     );
211 | }
212 | 


--------------------------------------------------------------------------------
/shell.nix:
--------------------------------------------------------------------------------
 1 | { pkgs ? import <nixpkgs> {} }:
 2 | 
 3 | with pkgs;
 4 | 
 5 | mkShell {
 6 |   nativeBuildInputs = [
 7 |     cmake pkg-config fontconfig
 8 |     xorg.libX11 xorg.libXcursor xorg.libXrandr xorg.libXi
 9 |     vulkan-tools vulkan-loader
10 | 
11 |     rust-analyzer
12 |   ];
13 | 
14 |   shellHook = ''
15 |     LD_LIBRARY_PATH="${lib.strings.makeLibraryPath [ xorg.libX11 xorg.libXcursor xorg.libXrandr xorg.libXi vulkan-loader ]}"
16 |   '';
17 | }
18 | 


--------------------------------------------------------------------------------
/src/lib.rs:
--------------------------------------------------------------------------------
  1 | use std::{iter, sync::Arc};
  2 | 
  3 | use egui::plot::PlotBounds;
  4 | use wgpu::{util::DeviceExt, TextureViewDescriptor};
  5 | 
  6 | const MSAA_SAMPLE_COUNT: u32 = 1;
  7 | const MAX_POINTS: usize = 5_000_000;
  8 | 
  9 | const DEFAULT_WIDTH: u32 = 1;
 10 | const DEFAULT_HEIGHT: u32 = 1;
 11 | 
 12 | #[repr(C)]
 13 | #[derive(Clone, Copy, Default, bytemuck::Pod, bytemuck::Zeroable)]
 14 | pub struct Vertex {
 15 |     pub position: [f32; 2],
 16 |     pub normal: [f32; 2],
 17 |     pub color: [f32; 4],
 18 | }
 19 | 
 20 | #[repr(C)]
 21 | #[derive(Clone, Copy, Default, bytemuck::Pod, bytemuck::Zeroable)]
 22 | pub struct Uniform {
 23 |     pub x_bounds: [f32; 2],
 24 |     pub y_bounds: [f32; 2],
 25 | }
 26 | 
 27 | pub struct GpuAcceleratedPlot {
 28 |     pipeline: wgpu::RenderPipeline,
 29 |     target_format: wgpu::TextureFormat,
 30 |     bind_group: wgpu::BindGroup,
 31 | 
 32 |     uniform_buffer: wgpu::Buffer,
 33 |     vertex_buffer: wgpu::Buffer,
 34 |     vertex_count: u32,
 35 | 
 36 |     texture: (wgpu::Texture, wgpu::TextureView),
 37 |     multisampled_texture: (wgpu::Texture, wgpu::TextureView),
 38 |     width: u32,
 39 |     height: u32,
 40 | }
 41 | 
 42 | impl GpuAcceleratedPlot {
 43 |     pub fn new(device: &wgpu::Device, target_format: wgpu::TextureFormat) -> GpuAcceleratedPlot {
 44 |         let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
 45 |             label: Some("egui_plot_line_shader"),
 46 |             source: wgpu::ShaderSource::Wgsl(include_str!("./line_shader.wgsl").into()),
 47 |         });
 48 | 
 49 |         let bind_group_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
 50 |             label: Some("egui_plot_bind_group_layout"),
 51 |             entries: &[wgpu::BindGroupLayoutEntry {
 52 |                 binding: 0,
 53 |                 visibility: wgpu::ShaderStages::VERTEX,
 54 |                 ty: wgpu::BindingType::Buffer {
 55 |                     ty: wgpu::BufferBindingType::Uniform,
 56 |                     has_dynamic_offset: false,
 57 |                     min_binding_size: None,
 58 |                 },
 59 |                 count: None,
 60 |             }],
 61 |         });
 62 | 
 63 |         let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
 64 |             label: Some("egui_plot_pipeline_layout"),
 65 |             bind_group_layouts: &[&bind_group_layout],
 66 |             push_constant_ranges: &[],
 67 |         });
 68 | 
 69 |         let pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
 70 |             label: Some("egui_plot_pipeline"),
 71 |             layout: Some(&pipeline_layout),
 72 |             vertex: wgpu::VertexState {
 73 |                 module: &shader,
 74 |                 entry_point: "vs_main",
 75 |                 buffers: &[wgpu::VertexBufferLayout {
 76 |                     array_stride: std::mem::size_of::<Vertex>() as wgpu::BufferAddress,
 77 |                     step_mode: wgpu::VertexStepMode::Vertex,
 78 |                     attributes: &wgpu::vertex_attr_array![0 => Float32x2, 1 => Float32x2, 2 => Float32x4],
 79 |                 }],
 80 |             },
 81 |             fragment: Some(wgpu::FragmentState {
 82 |                 module: &shader,
 83 |                 entry_point: "fs_main",
 84 |                 targets: &[Some(wgpu::ColorTargetState {
 85 |                     format: target_format,
 86 |                     blend: Some(wgpu::BlendState::ALPHA_BLENDING),
 87 |                     write_mask: wgpu::ColorWrites::ALL,
 88 |                 })],
 89 |             }),
 90 |             primitive: wgpu::PrimitiveState {
 91 |                 topology: wgpu::PrimitiveTopology::TriangleStrip,
 92 |                 ..Default::default()
 93 |             },
 94 |             depth_stencil: None,
 95 |             multisample: wgpu::MultisampleState {
 96 |                 count: MSAA_SAMPLE_COUNT,
 97 |                 ..Default::default()
 98 |             },
 99 |             multiview: None,
100 |         });
101 | 
102 |         let uniform_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
103 |             label: Some("egui_plot_uniforms"),
104 |             contents: bytemuck::cast_slice(&[Uniform {
105 |                 x_bounds: [-1.0, 1.0],
106 |                 y_bounds: [-1.0, 1.0],
107 |             }]),
108 |             usage: wgpu::BufferUsages::COPY_DST
109 |                 | wgpu::BufferUsages::MAP_WRITE
110 |                 | wgpu::BufferUsages::UNIFORM,
111 |         });
112 | 
113 |         let vertex_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
114 |             label: Some("egui_plot_vertices"),
115 |             contents: bytemuck::cast_slice(&vec![Vertex::default(); MAX_POINTS]),
116 |             usage: wgpu::BufferUsages::COPY_DST
117 |                 | wgpu::BufferUsages::MAP_WRITE
118 |                 | wgpu::BufferUsages::VERTEX,
119 |         });
120 | 
121 |         let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
122 |             label: Some("egui_plot_bind_group"),
123 |             layout: &bind_group_layout,
124 |             entries: &[wgpu::BindGroupEntry {
125 |                 binding: 0,
126 |                 resource: uniform_buffer.as_entire_binding(),
127 |             }],
128 |         });
129 | 
130 |         // Allocate some stand-in textures since we don't know the final width
131 |         // and height yet.
132 |         let texture = Self::create_texture(device, target_format, 1, DEFAULT_WIDTH, DEFAULT_HEIGHT);
133 |         let multisampled_texture = Self::create_texture(
134 |             device,
135 |             target_format,
136 |             MSAA_SAMPLE_COUNT,
137 |             DEFAULT_WIDTH,
138 |             DEFAULT_HEIGHT,
139 |         );
140 | 
141 |         GpuAcceleratedPlot {
142 |             pipeline,
143 |             target_format,
144 |             bind_group,
145 |             uniform_buffer,
146 |             vertex_buffer,
147 |             vertex_count: 0,
148 |             texture,
149 |             multisampled_texture,
150 |             width: DEFAULT_WIDTH,
151 |             height: DEFAULT_HEIGHT,
152 |         }
153 |     }
154 | 
155 |     fn create_texture(
156 |         device: &wgpu::Device,
157 |         target_format: wgpu::TextureFormat,
158 |         sample_count: u32,
159 |         width: u32,
160 |         height: u32,
161 |     ) -> (wgpu::Texture, wgpu::TextureView) {
162 |         let texture = device.create_texture(&wgpu::TextureDescriptor {
163 |             label: Some("egui_plot_texture"),
164 |             size: wgpu::Extent3d {
165 |                 width,
166 |                 height,
167 |                 depth_or_array_layers: 1,
168 |             },
169 |             mip_level_count: 1,
170 |             sample_count,
171 |             dimension: wgpu::TextureDimension::D2,
172 |             format: target_format,
173 |             usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::RENDER_ATTACHMENT,
174 |         });
175 | 
176 |         let view = texture.create_view(&TextureViewDescriptor::default());
177 | 
178 |         (texture, view)
179 |     }
180 | 
181 |     pub fn create_view(&self) -> wgpu::TextureView {
182 |         self.texture
183 |             .0
184 |             .create_view(&wgpu::TextureViewDescriptor::default())
185 |     }
186 | 
187 |     fn create_multisampled_view(&self) -> wgpu::TextureView {
188 |         self.multisampled_texture
189 |             .0
190 |             .create_view(&wgpu::TextureViewDescriptor::default())
191 |     }
192 | 
193 |     pub fn prepare(
194 |         &mut self,
195 |         device: &wgpu::Device,
196 |         queue: &wgpu::Queue,
197 |         dimensions: [u32; 2],
198 |         bounds: &PlotBounds,
199 |         points: &[Vertex],
200 |         dirty: bool,
201 |     ) {
202 |         // Re-allocate the render targets if the requested dimensions have changed.
203 |         if dimensions[0] != self.width || dimensions[1] != self.height {
204 |             self.width = dimensions[0];
205 |             self.height = dimensions[1];
206 | 
207 |             self.texture =
208 |                 Self::create_texture(device, self.target_format, 1, self.width, self.height);
209 |             self.multisampled_texture = Self::create_texture(
210 |                 device,
211 |                 self.target_format,
212 |                 MSAA_SAMPLE_COUNT,
213 |                 self.width,
214 |                 self.height,
215 |             );
216 |         }
217 | 
218 |         queue.write_buffer(
219 |             &self.uniform_buffer,
220 |             0,
221 |             bytemuck::cast_slice(&[Uniform {
222 |                 x_bounds: [bounds.min()[0] as f32, bounds.max()[0] as f32],
223 |                 y_bounds: [bounds.min()[1] as f32, bounds.max()[1] as f32],
224 |             }]),
225 |         );
226 | 
227 |         // Only re-upload the vertex buffer if it has changed.
228 |         // TODO: for time-series charts where the buffer acts as a ring, we
229 |         // could be smart about updating only the subset of added/removed
230 |         // vertices.
231 |         if dirty {
232 |             self.vertex_count = points.len() as u32;
233 |             queue.write_buffer(&self.vertex_buffer, 0, bytemuck::cast_slice(points));
234 |         }
235 |     }
236 | 
237 |     pub fn render(&self, device: &wgpu::Device, queue: &wgpu::Queue) {
238 |         let mut encoder =
239 |             device.create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
240 |         {
241 |             let view = self.create_view();
242 |             let msaa_view = self.create_multisampled_view();
243 | 
244 |             // Render directly to the texture if no MSAA, or use the
245 |             // multisampled buffer and resolve to the texture if using MSAA.
246 |             let rpass_color_attachment = if MSAA_SAMPLE_COUNT == 1 {
247 |                 wgpu::RenderPassColorAttachment {
248 |                     view: &view,
249 |                     resolve_target: None,
250 |                     ops: wgpu::Operations {
251 |                         load: wgpu::LoadOp::Clear(wgpu::Color::TRANSPARENT),
252 |                         store: true,
253 |                     },
254 |                 }
255 |             } else {
256 |                 wgpu::RenderPassColorAttachment {
257 |                     view: &msaa_view,
258 |                     resolve_target: Some(&view),
259 |                     ops: wgpu::Operations {
260 |                         load: wgpu::LoadOp::Clear(wgpu::Color::TRANSPARENT),
261 |                         store: false,
262 |                     },
263 |                 }
264 |             };
265 | 
266 |             let mut rpass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
267 |                 label: None,
268 |                 color_attachments: &[Some(rpass_color_attachment)],
269 |                 depth_stencil_attachment: None,
270 |             });
271 | 
272 |             self.render_onto_renderpass(&mut rpass);
273 |         }
274 | 
275 |         queue.submit(iter::once(encoder.finish()));
276 |     }
277 | 
278 |     pub fn render_onto_renderpass<'rp>(&'rp self, rpass: &mut wgpu::RenderPass<'rp>) {
279 |         rpass.set_pipeline(&self.pipeline);
280 |         rpass.set_vertex_buffer(0, self.vertex_buffer.slice(..));
281 |         rpass.set_bind_group(0, &self.bind_group, &[]);
282 |         rpass.draw(0..self.vertex_count, 0..1);
283 |     }
284 | }
285 | 
286 | pub fn egui_wgpu_callback(
287 |     bounds: PlotBounds,
288 |     points: Arc<Vec<Vertex>>,
289 |     rect: egui::Rect,
290 |     dirty: bool,
291 | ) -> egui::PaintCallback {
292 |     let cb =
293 |         egui_wgpu::CallbackFn::new().prepare(move |device, queue, paint_callback_resources| {
294 |             let plot: &mut GpuAcceleratedPlot = paint_callback_resources.get_mut().unwrap();
295 | 
296 |             plot.prepare(
297 |                 device,
298 |                 queue,
299 |                 [rect.width() as u32, rect.height() as u32],
300 |                 &bounds,
301 |                 &points,
302 |                 dirty,
303 |             );
304 | 
305 |             plot.render(device, queue);
306 |         });
307 | 
308 |     egui::PaintCallback {
309 |         rect,
310 |         callback: Arc::new(cb),
311 |     }
312 | }
313 | 


--------------------------------------------------------------------------------
/src/line_shader.wgsl:
--------------------------------------------------------------------------------
 1 | struct VertexOut {
 2 |     @location(0) color: vec4<f32>,
 3 |     @location(1) norm: vec2<f32>,
 4 |     @builtin(position) position: vec4<f32>,
 5 | };
 6 | 
 7 | struct Uniforms {
 8 |     x_range: vec2<f32>,
 9 |     y_range: vec2<f32>,
10 | };
11 | 
12 | @group(0) @binding(0)
13 | var<uniform> uniforms: Uniforms;
14 | 
15 | let LINE_WIDTH: f32 = 0.002;
16 | let FEATHER: f32 = 0.50;
17 | 
18 | @vertex
19 | fn vs_main(@location(0) position: vec2<f32>,
20 |            @location(1) norm: vec2<f32>,
21 |            @location(2) color: vec4<f32>) -> VertexOut {
22 |     var out: VertexOut;
23 | 
24 |     let width = (uniforms.x_range[1] - uniforms.x_range[0]);
25 |     let height = (uniforms.y_range[1] - uniforms.y_range[0]);
26 | 
27 |     // Convert from data space (x0..x1, y0..y1) to view space (-1..1, -1..1).
28 |     let x = mix(-1.0, 1.0, (position.x - uniforms.x_range[0]) / width);
29 |     let y = mix(-1.0, 1.0, (position.y - uniforms.y_range[0]) / height);
30 | 
31 |     // Move the point along the normal by LINE_WIDTH. If the normals are
32 |     // provided such that they are sequentially flipped, this forms a triangle
33 |     // strip the width of the line.
34 |     let delta = vec4(LINE_WIDTH * norm, 0.0, 0.0);
35 | 
36 |     out.color = color;
37 |     out.norm = norm;
38 |     out.position = vec4<f32>(x, y, 0.0, 1.0) + delta;
39 | 
40 |     return out;
41 | }
42 | 
43 | @fragment
44 | fn fs_main(in: VertexOut) -> @location(0) vec4<f32> {
45 |     // At the edge of the line (final FEATHER % width) feather out the alpha
46 |     // channel to zero.
47 |     let alpha = smoothstep(0.0, 1.0, (1.0 - length(in.norm)) / FEATHER);
48 | 
49 |     return vec4(in.color.xyz, alpha * in.color.w);
50 | }
51 | 


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