Crate egui_screensaver_flame 

Flame screensaver for egui.

A windswept fire rendered from a fractal-noise fragment shader, ported from Blake Bowen’s “Flame in the wind” CodePen, itself adapting a shader by Shadertoy user @kuvkar.

Like the original, this runs the shader on the GPU: a fullscreen triangle is drawn through an egui::PaintCallback using egui_glow, so the per-pixel math runs in parallel across the GPU’s shader cores instead of serially on the CPU. This requires the host eframe::App to use the glow rendering backend (not wgpu) — FlameBackground::paint simply skips drawing if no glow::Context is available.

Rendering is capped at 30 FPS. If the hardware cannot sustain that rate, frames are painted as fast as possible without any artificial delay.

Usage

use egui_screensaver_flame::FlameBackground;

struct MyApp {
    flame: FlameBackground,
}

impl eframe::App for MyApp {
    fn ui(&mut self, ui: &mut egui::Ui, frame: &mut eframe::Frame) {
        let ctx = ui.ctx().clone();
        // Call paint once per frame before drawing any UI windows so the
        // screensaver sits on the background layer behind everything else.
        self.flame.paint(&ctx, frame.gl());
    }
}

Structs

FlameBackground

Flame screensaver state.