First commit

src/fractal/mod.rs

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+//! GPU fractal rendering: wgpu pipeline, uniforms, reference orbit, and the
+//! egui paint callback.
+
+pub mod reference;
+pub mod renderer;
+pub mod share;
+
+pub use reference::{compute_mandelbrot_reference, compute_reference};
+pub use renderer::{FractalCallback, FractalRenderer, Uniforms, MAX_REF_POINTS, encode_png};
+pub use share::ShareState;