renderbug: first implementation of surface-based rendering

Cargo.toml

@@ -34,6 +34,9 @@ ws2812-esp32-rmt-driver = { version = "*", features = ["embedded-graphics-core"]
 embedded-graphics = { version = "0.8.1", features = ["fixed_point", "defmt"] }
 hsv = "0.1.1"
 palette = { version = "0.7.6" }
+embedded-canvas = "0.3.1"
+embassy-executor = "0.6.0"
+running-average = "0.1.0"
 
 [build-dependencies]
 embuild = "0.32.0"

src/main.rs

@@ -1,17 +1,58 @@
+#![feature(trait_upcasting)]
 #![allow(arithmetic_overflow)]
 use esp_idf_svc::hal::prelude::Peripherals;
 use ws2812_esp32_rmt_driver::lib_embedded_graphics::{LedPixelStrip, Ws2812DrawTarget};
 use embedded_graphics::{
     prelude::*,
-    pixelcolor::Rgb888,
 };
 use palette::Hsv;
 use palette::convert::IntoColorUnclamped;
-
+use std::thread;
 
 mod power;
 mod lib8;
+mod render;
+mod task;
+mod time;
 
+use crate::time::Periodically;
+
+struct IdleTask {
+    frame: u8,
+    surface: render::Surface,
+    updater: Periodically
+}
+
+struct IdleShader {
+    frame: u8
+}
+
+impl render::Shader for IdleShader {
+    fn draw(&self, coords: Point) -> lib8::RGB8 {
+        Hsv::new_srgb(self.frame.wrapping_add(coords.x as u8), 255, 255).into_color_unclamped()
+    }
+}
+
+impl IdleTask {
+    fn new(render: &mut dyn render::Display) -> Self {
+        IdleTask {
+            frame: 0,
+            surface: render.new_surface(),
+            updater: Periodically::new_every_n_ms(16)
+        }
+    }
+}
+
+impl task::Task for IdleTask {
+    fn name(&self) -> &'static str { "Idle" }
+
+    fn tick(&mut self) {
+        self.updater.run(|| {
+            self.frame = self.frame.wrapping_add(1);
+            self.surface.set_shader(Box::new(IdleShader { frame: self.frame }));
+        })
+    }
+}
 
 fn main() {
     // It is necessary to call this function once. Otherwise some patches to the runtime
@@ -32,35 +73,18 @@ fn main() {
     const POWER_MA : u32 = 500;
     const MAX_POWER_MW : u32 = POWER_VOLTS * POWER_MA;
 
-    let mut draw = Ws2812DrawTarget::<LedPixelStrip<NUM_PIXELS>>::new(channel, led_pin).unwrap();
-    let mut hue : u8 = 0;
-    let mut length : usize = NUM_PIXELS;
-    let mut forwards = false;
-    loop {
-        let mut totalMW = 0;
-        draw.clear(Rgb888::BLACK);
-        for i in 0..length {
-            let hsvColor = Hsv::new_srgb(hue.wrapping_add(i as u8), 255, 255);
-            let rgbColor : lib8::RGB8 = hsvColor.into_color_unclamped();
-            let color = Rgb888::new(rgbColor.red, rgbColor.green, rgbColor.blue);
+    log::info!("Setting up display");
+    let target = Ws2812DrawTarget::<LedPixelStrip<NUM_PIXELS>>::new(channel, led_pin).unwrap();
+    let mut display = render::EmbeddedDisplay::new(target, MAX_POWER_MW);
 
-            totalMW += power::colorToMW(color);
-            Pixel(Point::new(i as i32, 0), color).draw(&mut draw).unwrap();
-        }
-        let brightness = power::brightnessForMW(totalMW, 255, MAX_POWER_MW);
-        draw.set_brightness(brightness);
-        draw.flush().unwrap();
-        log::info!("Frame hue={} power={} brightness={}", hue, totalMW, brightness);
-        hue  = hue.wrapping_add(1);
-        if forwards {
-            length += 1
-        } else {
-            length -= 1
-        }
-        if length <= 1 {
-            forwards = true;
-        } else if length >= NUM_PIXELS {
-            forwards = false;
-        }
+    log::info!("Creating runner");
+    let mut runner = task::Scheduler::new(vec![
+        Box::new(IdleTask::new(&mut display)),
+        Box::new(display),
+    ]);
+
+    log::info!("Ready to rock and roll");
+    loop {
+        runner.tick();
     }
 }

src/power.rs

@@ -1,23 +1,23 @@
 use embedded_graphics::pixelcolor::RgbColor;
 
-pub fn colorToMW(color : impl RgbColor) -> u32 {
-    const gRed_mW : u32   = 16 * 5; //< 16mA @ 5v = 80mW
-    const gGreen_mW : u32 = 11 * 5; //< 11mA @ 5v = 55mW
-    const gBlue_mW : u32  = 15 * 5; //< 15mA @ 5v = 75mW
-    const gDark_mW : u32  =  1 * 5; //<  1mA @ 5v =  5mW
+pub fn color_to_mw<T: RgbColor>(color : &T) -> u32 {
+    const RED_MW : u32   = 16 * 5; //< 16mA @ 5v = 80mW
+    const GREEN_MW : u32 = 11 * 5; //< 11mA @ 5v = 55mW
+    const BLUE_MW : u32  = 15 * 5; //< 15mA @ 5v = 75mW
+    const DARK_MW : u32  =  1 * 5; //<  1mA @ 5v =  5mW
 
-    let redMW = (color.r() as u32 * gRed_mW).wrapping_shr(8);
-    let greenMW = (color.g() as u32 * gGreen_mW).wrapping_shr(8);
-    let blueMW = (color.b() as u32 * gBlue_mW).wrapping_shr(8);
+    let red = (color.r() as u32 * RED_MW).wrapping_shr(8);
+    let green = (color.g() as u32 * GREEN_MW).wrapping_shr(8);
+    let blue = (color.b() as u32 * BLUE_MW).wrapping_shr(8);
 
-    return redMW + greenMW + blueMW + gDark_mW;
+    return red + green + blue + DARK_MW;
 }
 
-pub fn brightnessForMW(totalMW : u32, target : u8, maxPower: u32) -> u8 {
+pub fn brightness_for_mw(total_mw : u32, target : u8, max_power: u32) -> u8 {
     let target32 = target as u32;
-    let requestedMW = (totalMW * target32) / 256;
-    if requestedMW > maxPower {
-        return ((target32 * maxPower) / requestedMW).try_into().unwrap();
+    let requested_mw = (total_mw * target32) / 256;
+    if requested_mw > max_power {
+        return ((target32 * max_power) / requested_mw).try_into().unwrap();
     }
     return target;
 }

src/render.rs

@@ -0,0 +1,134 @@
+use embedded_graphics::{
+    prelude::*,
+    pixelcolor::Rgb888
+};
+use ws2812_esp32_rmt_driver::lib_embedded_graphics::{Ws2812DrawTarget, LedPixelShape};
+
+use std::rc::Rc;
+use std::cell::RefCell;
+
+use running_average::RealTimeRunningAverage;
+
+use crate::task;
+use crate::lib8::RGB8;
+use crate::power;
+use crate::time::Periodically;
+
+pub trait Shader: Send {
+    fn draw(&self, coords: Point) -> RGB8;
+}
+
+pub trait Surfaces {
+    fn new_surface(&mut self) -> Surface;
+}
+
+pub trait Display: Surfaces {
+    fn start_frame(&mut self) {}
+    fn end_frame(&mut self) {}
+
+    fn render_frame(&mut self) {}
+}
+
+impl<T> task::Task for T
+where
+T: Display {
+    fn name(&self) -> &'static str { "Renderer" }
+
+    fn tick(&mut self) {
+        self.start_frame();
+        self.render_frame();
+        self.end_frame();
+    }
+}
+
+struct ShaderSlot {
+    shader: Option<Box<dyn Shader>>
+}
+
+pub struct Surface {
+    slot: Rc<RefCell<ShaderSlot>>
+}
+
+impl Surface {
+    fn new(slot: Rc<RefCell<ShaderSlot>>) -> Self {
+        Self {
+            slot: slot
+        }
+    }
+
+    pub fn set_shader(&mut self, shader: Box<dyn Shader>) {
+        self.slot.borrow_mut().shader = Some(shader);
+    }
+}
+
+pub struct EmbeddedDisplay<T>
+where
+T: DrawTarget {
+    shaders : RefCell<Vec<Rc<RefCell<ShaderSlot>>>>,
+    target: T,
+    total_mw: u32,
+    max_mw: u32,
+    fps: RealTimeRunningAverage<u32>,
+    frame: u32,
+    fps_display: Periodically
+}
+
+impl<T> EmbeddedDisplay<T>
+where
+T: DrawTarget {
+    pub fn new(target: T, max_mw: u32) -> Self {
+        EmbeddedDisplay {
+            shaders: RefCell::new(Vec::new()),
+            target: target,
+            max_mw: max_mw,
+            total_mw: 0,
+            fps: RealTimeRunningAverage::default(),
+            frame: 0,
+            fps_display: Periodically::new_every_n_seconds(5)
+        }
+    }
+}
+
+impl<T> Surfaces for EmbeddedDisplay<T>
+where
+T: DrawTarget {
+    fn new_surface(&mut self) -> Surface {
+        let slot = Rc::new(RefCell::new(ShaderSlot {
+            shader: None
+        }));
+        let surface = Surface::new(slot.clone());
+        self.shaders.borrow_mut().push(slot);
+        return surface;
+    }
+}
+
+impl<T: LedPixelShape> Display for EmbeddedDisplay<Ws2812DrawTarget<'_, T>> {
+    fn start_frame(&mut self) {
+        self.target.clear(Rgb888::BLACK).unwrap();
+        self.total_mw = 0;
+        self.frame = self.frame.wrapping_add(1);
+    }
+
+    fn end_frame(&mut self) {
+        let brightness = power::brightness_for_mw(self.total_mw, 255, self.max_mw);
+        self.target.set_brightness(brightness);
+        self.target.flush().unwrap();
+        self.fps.insert(1);
+        self.fps_display.run(|| {
+            log::info!("FPS: {} frame={} brightness={} mw={}", self.fps.measurement(), self.frame, brightness, self.total_mw);
+        });
+    }
+
+    fn render_frame(&mut self) {
+        for slot in self.shaders.borrow().iter() {
+            if let Some(ref shader) = slot.borrow().shader {
+                for i in 0..T::size().width {
+                    let coords = Point::new(i as i32, 0);
+                    let color = shader.draw(coords);
+                    self.total_mw += power::color_to_mw(&color);
+                    Pixel(coords, Rgb888::new(color.red, color.green, color.blue)).draw(&mut self.target).unwrap();
+                }
+            }
+        }
+    }
+}

src/task.rs

@@ -0,0 +1,145 @@
+use std::fmt;
+
+pub trait Task {
+    fn tick(&mut self) {}
+    fn start(&mut self) {}
+    fn stop(&mut self) {}
+    fn name(&self) -> &'static str;
+}
+
+trait ScheduledState: std::fmt::Debug {
+    fn start(self: Box<Self>) -> Box<dyn ScheduledState>;
+    fn stop(self: Box<Self>) -> Box<dyn ScheduledState>;
+    fn tick(self: Box<Self>, task: &mut dyn Task) -> Box<dyn ScheduledState>;
+}
+
+#[derive(Debug)]
+struct Starting {}
+impl ScheduledState for Starting {
+    fn start(self: Box<Self>) -> Box<dyn ScheduledState> {
+        self
+    }
+
+    fn stop(self: Box<Self>) -> Box<dyn ScheduledState> {
+        Box::new(Stopped {})
+    }
+
+    fn tick(self: Box<Self>, task: &mut dyn Task) -> Box<dyn ScheduledState> {
+        task.start();
+        Box::new(Running{})
+    }
+}
+
+#[derive(Debug)]
+struct Running {}
+impl ScheduledState for Running {
+    fn start(self: Box<Self>) -> Box<dyn ScheduledState> {
+        self
+    }
+
+    fn stop(self: Box<Self>) -> Box<dyn ScheduledState> {
+        Box::new(Stopping {})
+    }
+
+    fn tick(self: Box<Self>, task: &mut dyn Task) -> Box<dyn ScheduledState> {
+        task.tick();
+        self
+    }
+}
+
+#[derive(Debug)]
+struct Stopping {}
+impl ScheduledState for Stopping  {
+    fn start(self: Box<Self>) -> Box<dyn ScheduledState> {
+        Box::new(Running {})
+    }
+
+    fn stop(self: Box<Self>) -> Box<dyn ScheduledState> {
+        self
+    }
+
+    fn tick(self: Box<Self>, task: &mut dyn Task) -> Box<dyn ScheduledState> {
+        task.stop();
+        Box::new(Stopped {})
+    }
+}
+
+#[derive(Debug)]
+struct Stopped {}
+impl ScheduledState for Stopped  {
+    fn start(self: Box<Self>) -> Box<dyn ScheduledState> {
+        Box::new(Starting {})
+    }
+
+    fn stop(self: Box<Self>) -> Box<dyn ScheduledState> {
+        self
+    }
+
+    fn tick(self: Box<Self>, _task: &mut dyn Task) -> Box<dyn ScheduledState> {
+        self
+    }
+}
+
+struct ScheduledTask {
+    state: Option<Box<dyn ScheduledState>>,
+    task: Box<dyn Task>
+}
+
+impl std::fmt::Debug for ScheduledTask {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("ScheduledTask")
+            .field("task", &self.task.name())
+            .field("state", &self.state)
+            .finish()
+    }
+}
+
+impl ScheduledTask {
+    fn new(task: Box<dyn Task>) -> Self {
+        ScheduledTask {
+            state: Some(Box::new(Starting{})),
+            task: task
+        }
+    }
+
+    fn start(&mut self) {
+        if let Some(s) = self.state.take() {
+            self.state = Some(s.start());
+        }
+    }
+
+    fn stop(&mut self) {
+        if let Some(s) = self.state.take() {
+            self.state = Some(s.stop());
+        }
+    }
+
+    fn tick(&mut self) {
+        if let Some(s) = self.state.take() {
+            self.state = Some(s.tick(self.task.as_mut()));
+        }
+    }
+}
+
+pub struct Scheduler {
+    tasks: Vec<ScheduledTask>
+}
+
+impl Scheduler {
+    pub fn new(tasks: Vec<Box<dyn Task>>) -> Self {
+        let mut scheduled = Vec::new();
+        for task in tasks {
+            log::info!("Scheduling task {:?}", task.name());
+            scheduled.push(ScheduledTask::new(task));
+        }
+        Scheduler {
+            tasks: scheduled
+        }
+    }
+
+    pub fn tick(&mut self) {
+        for task in &mut self.tasks {
+            task.tick();
+        }
+    }
+}

src/time.rs

@@ -0,0 +1,30 @@
+use std::time::{Instant, Duration};
+
+pub struct Periodically {
+    last_run: Instant,
+    duration: Duration
+}
+
+impl Periodically {
+    pub fn new(duration: Duration) -> Self {
+        Self {
+            last_run: Instant::now(),
+            duration: duration
+        }
+    }
+
+    pub fn new_every_n_seconds(seconds: u64) -> Self {
+        Self::new(Duration::new(seconds, 0))
+    }
+
+    pub fn new_every_n_ms(milliseconds: u32) -> Self {
+        Self::new(Duration::new(0, milliseconds*1000))
+    }
+
+    pub fn run<F>(&mut self, f: F) where F: FnOnce() {
+        if self.last_run.elapsed() >= self.duration {
+            f();
+            self.last_run = Instant::now();
+        }
+    }
+}