Added support for custom shader widget for iced_wgpu backend.

examples/custom_shader/src/main.rs

@@ -0,0 +1,174 @@
+mod camera;
+mod cubes;
+mod pipeline;
+mod primitive;
+
+use crate::cubes::Cubes;
+use iced::widget::{
+    checkbox, column, container, row, slider, text, vertical_space, Shader,
+};
+use iced::{
+    executor, window, Alignment, Application, Color, Command, Element, Length,
+    Renderer, Subscription, Theme,
+};
+use std::time::Instant;
+
+fn main() -> iced::Result {
+    IcedCubes::run(iced::Settings::default())
+}
+
+struct IcedCubes {
+    start: Instant,
+    cubes: Cubes,
+    num_cubes_slider: u32,
+}
+
+impl Default for IcedCubes {
+    fn default() -> Self {
+        Self {
+            start: Instant::now(),
+            cubes: Cubes::new(),
+            num_cubes_slider: cubes::MAX,
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+enum Message {
+    CubeAmountChanged(u32),
+    CubeSizeChanged(f32),
+    Tick(Instant),
+    ShowDepthBuffer(bool),
+    LightColorChanged(Color),
+}
+
+impl Application for IcedCubes {
+    type Executor = executor::Default;
+    type Message = Message;
+    type Theme = Theme;
+    type Flags = ();
+
+    fn new(_flags: Self::Flags) -> (Self, Command<Self::Message>) {
+        (IcedCubes::default(), Command::none())
+    }
+
+    fn title(&self) -> String {
+        "Iced Cubes".to_string()
+    }
+
+    fn update(&mut self, message: Self::Message) -> Command<Self::Message> {
+        match message {
+            Message::CubeAmountChanged(num) => {
+                self.num_cubes_slider = num;
+                self.cubes.adjust_num_cubes(num);
+            }
+            Message::CubeSizeChanged(size) => {
+                self.cubes.size = size;
+            }
+            Message::Tick(time) => {
+                self.cubes.update(time - self.start);
+            }
+            Message::ShowDepthBuffer(show) => {
+                self.cubes.show_depth_buffer = show;
+            }
+            Message::LightColorChanged(color) => {
+                self.cubes.light_color = color;
+            }
+        }
+
+        Command::none()
+    }
+
+    fn view(&self) -> Element<'_, Self::Message, Renderer<Self::Theme>> {
+        let top_controls = row![
+            control(
+                "Amount",
+                slider(
+                    1..=cubes::MAX,
+                    self.num_cubes_slider,
+                    Message::CubeAmountChanged
+                )
+                .width(100)
+            ),
+            control(
+                "Size",
+                slider(0.1..=0.25, self.cubes.size, Message::CubeSizeChanged)
+                    .step(0.01)
+                    .width(100),
+            ),
+            checkbox(
+                "Show Depth Buffer",
+                self.cubes.show_depth_buffer,
+                Message::ShowDepthBuffer
+            ),
+        ]
+        .spacing(40);
+
+        let bottom_controls = row![
+            control(
+                "R",
+                slider(0.0..=1.0, self.cubes.light_color.r, move |r| {
+                    Message::LightColorChanged(Color {
+                        r,
+                        ..self.cubes.light_color
+                    })
+                })
+                .step(0.01)
+                .width(100)
+            ),
+            control(
+                "G",
+                slider(0.0..=1.0, self.cubes.light_color.g, move |g| {
+                    Message::LightColorChanged(Color {
+                        g,
+                        ..self.cubes.light_color
+                    })
+                })
+                .step(0.01)
+                .width(100)
+            ),
+            control(
+                "B",
+                slider(0.0..=1.0, self.cubes.light_color.b, move |b| {
+                    Message::LightColorChanged(Color {
+                        b,
+                        ..self.cubes.light_color
+                    })
+                })
+                .step(0.01)
+                .width(100)
+            )
+        ]
+        .spacing(40);
+
+        let controls = column![top_controls, bottom_controls,]
+            .spacing(10)
+            .align_items(Alignment::Center);
+
+        let shader = Shader::new(&self.cubes)
+            .width(Length::Fill)
+            .height(Length::Fill);
+
+        container(
+            column![shader, controls, vertical_space(20),]
+                .spacing(40)
+                .align_items(Alignment::Center),
+        )
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .center_x()
+        .center_y()
+        .into()
+    }
+
+    fn subscription(&self) -> Subscription<Self::Message> {
+        window::frames().map(Message::Tick)
+    }
+}
+
+fn control<'a>(
+    label: &'static str,
+    control: impl Into<Element<'a, Message>>,
+) -> Element<'a, Message> {
+    row![text(label), control.into()].spacing(10).into()
+}