refactor: cleanup code

CLAUDE.md

@@ -61,11 +61,15 @@ pixel is a handful of `f32` complex multiplies.
 - `src/view.rs` — `ViewState`; center is arbitrary-precision `FBig` (`Big`
   type alias), pixel scale stays `f64` (still in-range at 10³⁰×). Precision
   (bits) scales with zoom depth (`precision_for`).
-- `src/fractal/reference.rs` — `FractalKind` enum (Mandelbrot, Burning Ship,
-  Tricorn, Multibrot, Celtic, Perpendicular, Buffalo, Phoenix, Lambda) and
-  `compute_reference`/`compute_set_reference`: iterate the chosen formula at
-  high precision on the CPU, emitting `Z_n` as `f32` pairs — that's the
-  reference orbit the GPU perturbs from.
+- `src/fractal/kind.rs` — the `FractalKind` enum (Mandelbrot, Burning Ship,
+  Tricorn, Multibrot, Celtic, Perpendicular, Buffalo, Phoenix, Lambda,
+  Complex Multibrot) plus everything that only needs to switch on it:
+  `label`/`description`/`formula` (UI text), `share_tag`/`from_share_tag`
+  (share-link encoding), `default_set_view` (per-kind starting view), and the
+  `ALL` array used to enumerate every kind.
+- `src/fractal/reference.rs` — `compute_reference`/`compute_set_reference`:
+  iterate the chosen formula at high precision on the CPU, emitting `Z_n` as
+  `f32` pairs — that's the reference orbit the GPU perturbs from.
 - `src/shaders/*.wgsl` — none of these are standalone WGSL modules; WGSL has
   no `#include`, so each is compiled by concatenating plain-text fragments
   with `concat!`/`include_str!` at the `create_shader_module` call site (see
@@ -106,29 +110,31 @@ pixel is a handful of `f32` complex multiplies.
   `should_request`/`ensure_reference` (decide when the reference is stale and
   dispatch/collect it), `make_uniforms` (assemble the per-frame `Uniforms`),
   `tick_animations` (drives the "morph c/p/λ" and auto-zoom animations),
-  `default_view_for` (per-kind starting view). `KINDS`, `JULIA_PRESETS`, and
-  `SET_PRESETS` are sized as `[T; FractalKind::<last variant> as usize + 1]` —
-  adding a new `FractalKind` means bumping all three (and adding an empty
-  `&[]` slot to the two preset arrays if the kind has none).
+  `default_view_for` (wraps `FractalKind::default_set_view`, adding the
+  kind-independent Julia case). `JULIA_PRESETS` and `SET_PRESETS` are sized as
+  `[T; FractalKind::<last variant> as usize + 1]` — adding a new `FractalKind`
+  means bumping both (and adding an empty `&[]` slot to each if the kind has
+  none), plus adding it to `FractalKind::ALL` in `kind.rs`.
 - `src/fractal/share.rs` — `ShareState`: encodes the full view (mode, kind,
   full-precision decimal center, zoom, iterations, per-kind constants,
   coloring) as a `#`-fragment URL for bookmarking/sharing deep-zoom locations.
 
 ### Adding a new `FractalKind`
 
-Touches, in order: `reference.rs` (enum variant + CPU iteration formula, and a
-test comparing against a naive `f64` iteration), `common.wgsl` (matching
-`KIND_*` const), `mandelbrot.wgsl` (matching `advance_delta`/`fprime` arms),
-`buddhabrot.wgsl` (matching arm in `advance()`, if the kind makes sense as a
-Buddhabrot), `renderer.rs`
-`Uniforms` (only if the kind needs a new per-kind constant, e.g. Phoenix's
-`phoenix_p`), `share.rs` (encode/decode string tag), `app.rs` (`KINDS` label,
-`JULIA_PRESETS`/`SET_PRESETS` slot, `default_view_for` entry, and optionally a
-UI control for its constant + an animation toggle, following the
-Phoenix/Lambda pattern). If `c` doesn't enter the formula additively (e.g. a
-rational map with `c` in a denominator), the `advance_delta`/`step_add` split
-doesn't work — that needs its own step function plus extra per-step reference
-data uploaded in a second GPU buffer alongside the orbit.
+Touches, in order: `kind.rs` (enum variant + `ALL` slot + `label`/
+`description`/`formula`/`share_tag`/`from_share_tag`/`default_set_view`
+arms), `reference.rs` (CPU iteration formula arm, and a test comparing
+against a naive `f64` iteration), `common.wgsl` (matching `KIND_*` const),
+`mandelbrot.wgsl` (matching `advance_delta`/`fprime` arms), `buddhabrot.wgsl`
+(matching arm in `advance()`, if the kind makes sense as a Buddhabrot),
+`renderer.rs` `Uniforms` (only if the kind needs a new per-kind constant,
+e.g. Phoenix's `phoenix_p`), `app.rs` (`JULIA_PRESETS`/`SET_PRESETS` slot,
+and optionally a UI control for its constant + an animation toggle,
+following the Phoenix/Lambda pattern). If `c` doesn't enter the formula
+additively (e.g. a rational map with `c` in a denominator), the
+`advance_delta`/`step_add` split doesn't work — that needs its own step
+function plus extra per-step reference data uploaded in a second GPU buffer
+alongside the orbit.
 
 ### Buddhabrot is a separate pipeline
 

src/app.rs

@@ -46,49 +46,6 @@ pub enum FractalMode {
     Buddhabrot,
 }
 
-/// Selectable fractal formulas, with UI labels.
-const KINDS: &[(FractalKind, &str)] = &[
-    (FractalKind::Mandelbrot, "Mandelbrot"),
-    (FractalKind::BurningShip, "Burning Ship"),
-    (FractalKind::Tricorn, "Tricorn"),
-    (FractalKind::Multibrot, "Multibrot"),
-    (FractalKind::Celtic, "Celtic"),
-    (FractalKind::Perpendicular, "Perpendicular"),
-    (FractalKind::Buffalo, "Buffalo"),
-    (FractalKind::Phoenix, "Phoenix"),
-    (FractalKind::Lambda, "Lambda"),
-    (FractalKind::ComplexMultibrot, "Complex Multibrot"),
-];
-
-/// UI label for a fractal kind.
-fn kind_label(kind: FractalKind) -> &'static str {
-    KINDS
-        .iter()
-        .find(|(k, _)| *k == kind)
-        .map(|(_, name)| *name)
-        .unwrap_or("Mandelbrot")
-}
-
-/// The iteration formula for a kind, in human-readable notation (mirrors the
-/// doc comments on `FractalKind`'s variants). `power` is only used by
-/// Multibrot; `complex_power` only by Complex Multibrot.
-fn kind_formula(kind: FractalKind, power: u32, complex_power: (f64, f64)) -> String {
-    match kind {
-        FractalKind::Mandelbrot => "z = z² + c".to_string(),
-        FractalKind::BurningShip => "z = (|Re(z)| + i|Im(z)|)² + c".to_string(),
-        FractalKind::Tricorn => "z = conj(z)² + c".to_string(),
-        FractalKind::Multibrot => format!("z = z^{power} + c"),
-        FractalKind::Celtic => "z = |Re(z²)| + i·Im(z²) + c".to_string(),
-        FractalKind::Perpendicular => "z = (x² − y²) − 2x|y|i + c".to_string(),
-        FractalKind::Buffalo => "z = |Re(z²)| − i|Im(z²)| + c".to_string(),
-        FractalKind::Phoenix => "z = z² + c + p·z_prev".to_string(),
-        FractalKind::Lambda => "z = λ·z(1 − z)".to_string(),
-        FractalKind::ComplexMultibrot => {
-            format!("z = z^({:.3}{:+.3}i) + c", complex_power.0, complex_power.1)
-        }
-    }
-}
-
 type JuliaPreset = (&'static str, f64, f64, u32, Option<(f64, f64)>);
 
 /// Nice-looking Julia constants offered as presets.
@@ -697,18 +654,7 @@ impl FractalApp {
         if mode == FractalMode::Julia {
             return ViewState::with_center(big_from_f64(0.0, 53), big_from_f64(0.0, 53), 1.5);
         }
-        let (cr, ci, hh) = match kind {
-            FractalKind::Mandelbrot => (-0.5, 0.0, 1.25),
-            FractalKind::BurningShip => (-0.5, -0.5, 1.3),
-            FractalKind::Tricorn => (-0.25, 0.0, 1.6),
-            FractalKind::Multibrot => (0.0, 0.0, 1.5),
-            FractalKind::Celtic => (-0.5, 0.0, 1.6),
-            FractalKind::Perpendicular => (-0.5, 0.0, 1.5),
-            FractalKind::Buffalo => (-0.5, -0.5, 1.5),
-            FractalKind::Phoenix => (0.0, 0.0, 1.6),
-            FractalKind::Lambda => (0.0, 0.0, 1.6),
-            FractalKind::ComplexMultibrot => (0.0, 0.0, 1.5),
-        };
+        let (cr, ci, hh) = kind.default_set_view();
         ViewState::with_center(big_from_f64(cr, 53), big_from_f64(ci, 53), hh)
     }
 
@@ -1249,11 +1195,7 @@ impl FractalApp {
             .resizable(false)
             .anchor(egui::Align2::LEFT_BOTTOM, egui::vec2(8.0, -44.0))
             .show(ctx, |ui| {
-                ui.label(
-                    egui::RichText::new(kind_label(self.kind))
-                        .strong()
-                        .heading(),
-                );
+                ui.label(egui::RichText::new(self.kind.label()).strong().heading());
                 let mode_label = match self.mode {
                     FractalMode::Mandelbrot => {
                         "Mandelbrot mode — parameter space (c varies per pixel, z₀ = 0)"
@@ -1268,7 +1210,7 @@ impl FractalApp {
 
                 ui.label(format!(
                     "formula: {}",
-                    kind_formula(self.kind, self.power, self.complex_power)
+                    self.kind.formula(self.power, self.complex_power)
                 ));
                 if self.mode == FractalMode::Julia {
                     ui.label(format!("c = {:.6} {:+.6}i", self.julia_c.0, self.julia_c.1));
@@ -1517,10 +1459,10 @@ impl FractalApp {
         // since interesting regions differ between fractals.
         let prev_kind = self.kind;
         egui::ComboBox::from_label("fractal")
-            .selected_text(kind_label(self.kind))
+            .selected_text(self.kind.label())
             .show_ui(ui, |ui| {
-                for &(kind, name) in KINDS {
-                    ui.selectable_value(&mut self.kind, kind, name);
+                for kind in FractalKind::ALL {
+                    ui.selectable_value(&mut self.kind, kind, kind.label());
                 }
             });
         if self.kind == FractalKind::Multibrot {

src/fractal/kind.rs

@@ -0,0 +1,165 @@
+//! `FractalKind`: the enum selecting which iteration formula is in use, plus
+//! everything that only needs to switch on it (UI label/description/formula
+//! text, share-link tag, default parameter-plane view). The CPU/GPU orbit
+//! math itself lives in `reference.rs` (CPU reference orbit) and
+//! `shaders/mandelbrot.wgsl` (GPU perturbation delta) since both must also
+//! stay in sync with `common.wgsl`'s `KIND_*` constants.
+
+/// The iteration formula. Must be kept in sync with `advance_delta` and the
+/// `KIND_*` constants in the shader.
+#[repr(u8)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+pub enum FractalKind {
+    /// `z -> z^2 + c`.
+    Mandelbrot = 0,
+    /// `z -> (|Re z| + i|Im z|)^2 + c`.
+    BurningShip = 1,
+    /// `z -> conj(z)^2 + c` (the Mandelbar).
+    Tricorn = 2,
+    /// `z -> z^power + c` (power >= 2).
+    Multibrot = 3,
+    /// `z -> |Re(z^2)| + i·Im(z^2) + c` (abs on the real output of the square).
+    Celtic = 4,
+    /// `z -> (x^2 - y^2) - 2·x·|y|·i + c` (abs on the imaginary input).
+    Perpendicular = 5,
+    /// `z -> |Re(z^2)| - |Im(z^2)|·i + c` (abs on both outputs).
+    Buffalo = 6,
+    /// `z -> z^2 + c + p·z_{n-1}` (two-term recurrence; `p` is `phoenix_p`).
+    Phoenix = 7,
+    /// `z -> lambda·z(1 - z)` (logistic map).
+    Lambda = 8,
+    /// `z -> z^power + c`, where `power` is a complex constant (the
+    /// `complex_power` argument), via the principal branch `z^p = exp(p·ln z)`.
+    ComplexMultibrot = 9,
+}
+
+impl FractalKind {
+    /// Every kind, in declaration/discriminant order. Sized arrays keyed by
+    /// `kind as usize` (`JULIA_PRESETS`, `SET_PRESETS`) must have one slot per
+    /// entry here.
+    pub const ALL: [FractalKind; 10] = [
+        FractalKind::Mandelbrot,
+        FractalKind::BurningShip,
+        FractalKind::Tricorn,
+        FractalKind::Multibrot,
+        FractalKind::Celtic,
+        FractalKind::Perpendicular,
+        FractalKind::Buffalo,
+        FractalKind::Phoenix,
+        FractalKind::Lambda,
+        FractalKind::ComplexMultibrot,
+    ];
+
+    pub fn description(&self) -> &'static str {
+        match self {
+            FractalKind::Mandelbrot => {
+                "The Mandelbrot set is the most famous fractal set, obtained with the simplest escape-time formula. This set represents all Julia fractals: each points of the Mandelbrot set is related to a specific Julia fractal."
+            }
+            FractalKind::BurningShip => {
+                "A variation of the famous Mandelbrot set, using absolute values on the real and imaginary part of each iterations."
+            }
+            FractalKind::Tricorn => {
+                "The Tricorn set is obtained using the same formula as the Mandelbrot set, taking the complex conjugate of the previous iteration."
+            }
+            FractalKind::Multibrot => {
+                "Multibrot use the same formula as the Mandelbrot set, with a bigger exposant."
+            }
+            FractalKind::Celtic => "",
+            FractalKind::Perpendicular => "",
+            FractalKind::Buffalo => "",
+            FractalKind::Phoenix => "",
+            FractalKind::Lambda => "",
+            FractalKind::ComplexMultibrot => {
+                "Like Multibrot, but the exponent itself is a complex number instead of a plain integer, via z^p = exp(p·ln z)."
+            }
+        }
+    }
+
+    /// UI label for this kind (combo box / info panel heading).
+    pub fn label(&self) -> &'static str {
+        match self {
+            FractalKind::Mandelbrot => "Mandelbrot",
+            FractalKind::BurningShip => "Burning Ship",
+            FractalKind::Tricorn => "Tricorn",
+            FractalKind::Multibrot => "Multibrot",
+            FractalKind::Celtic => "Celtic",
+            FractalKind::Perpendicular => "Perpendicular",
+            FractalKind::Buffalo => "Buffalo",
+            FractalKind::Phoenix => "Phoenix",
+            FractalKind::Lambda => "Lambda",
+            FractalKind::ComplexMultibrot => "Complex Multibrot",
+        }
+    }
+
+    /// The iteration formula in human-readable notation (mirrors the doc
+    /// comments on the variants above). `power` is only used by Multibrot;
+    /// `complex_power` only by Complex Multibrot.
+    pub fn formula(&self, power: u32, complex_power: (f64, f64)) -> String {
+        match self {
+            FractalKind::Mandelbrot => "z = z² + c".to_string(),
+            FractalKind::BurningShip => "z = (|Re(z)| + i|Im(z)|)² + c".to_string(),
+            FractalKind::Tricorn => "z = conj(z)² + c".to_string(),
+            FractalKind::Multibrot => format!("z = z^{power} + c"),
+            FractalKind::Celtic => "z = |Re(z²)| + i·Im(z²) + c".to_string(),
+            FractalKind::Perpendicular => "z = (x² − y²) − 2x|y|i + c".to_string(),
+            FractalKind::Buffalo => "z = |Re(z²)| − i|Im(z²)| + c".to_string(),
+            FractalKind::Phoenix => "z = z² + c + p·z_prev".to_string(),
+            FractalKind::Lambda => "z = λ·z(1 − z)".to_string(),
+            FractalKind::ComplexMultibrot => {
+                format!("z = z^({:.3}{:+.3}i) + c", complex_power.0, complex_power.1)
+            }
+        }
+    }
+
+    /// Short tag used to identify this kind in a share-link fragment.
+    pub fn share_tag(&self) -> &'static str {
+        match self {
+            FractalKind::Mandelbrot => "mandel",
+            FractalKind::BurningShip => "burning",
+            FractalKind::Tricorn => "tricorn",
+            FractalKind::Multibrot => "multi",
+            FractalKind::Celtic => "celtic",
+            FractalKind::Perpendicular => "perp",
+            FractalKind::Buffalo => "buffalo",
+            FractalKind::Phoenix => "phoenix",
+            FractalKind::Lambda => "lambda",
+            FractalKind::ComplexMultibrot => "cmulti",
+        }
+    }
+
+    /// Inverse of `share_tag`; unknown tags fall back to `None` so the caller
+    /// can decide the default (matches historical share-link behavior).
+    pub fn from_share_tag(tag: &str) -> Option<FractalKind> {
+        Some(match tag {
+            "mandel" => FractalKind::Mandelbrot,
+            "burning" => FractalKind::BurningShip,
+            "tricorn" => FractalKind::Tricorn,
+            "multi" => FractalKind::Multibrot,
+            "celtic" => FractalKind::Celtic,
+            "perp" => FractalKind::Perpendicular,
+            "buffalo" => FractalKind::Buffalo,
+            "phoenix" => FractalKind::Phoenix,
+            "lambda" => FractalKind::Lambda,
+            "cmulti" => FractalKind::ComplexMultibrot,
+            _ => return None,
+        })
+    }
+
+    /// Default parameter-plane (Mandelbrot-mode) view for this kind, as
+    /// `(center_re, center_im, half_height)`. The Julia (dynamical) plane
+    /// doesn't vary by kind, so it isn't covered here.
+    pub fn default_set_view(&self) -> (f64, f64, f64) {
+        match self {
+            FractalKind::Mandelbrot => (-0.5, 0.0, 1.25),
+            FractalKind::BurningShip => (-0.5, -0.5, 1.3),
+            FractalKind::Tricorn => (-0.25, 0.0, 1.6),
+            FractalKind::Multibrot => (0.0, 0.0, 1.5),
+            FractalKind::Celtic => (-0.5, 0.0, 1.6),
+            FractalKind::Perpendicular => (-0.5, 0.0, 1.5),
+            FractalKind::Buffalo => (-0.5, -0.5, 1.5),
+            FractalKind::Phoenix => (0.0, 0.0, 1.6),
+            FractalKind::Lambda => (0.0, 0.0, 1.6),
+            FractalKind::ComplexMultibrot => (0.0, 0.0, 1.5),
+        }
+    }
+}

src/fractal/mod.rs

@@ -2,12 +2,14 @@
 //! egui paint callback.
 
 pub mod buddhabrot;
+pub mod kind;
 pub mod reference;
 pub mod renderer;
 pub mod share;
 
 pub use buddhabrot::{BuddhabrotCallback, BuddhabrotRenderer, BuddhabrotUniforms};
-pub use reference::{FractalKind, compute_reference, compute_set_reference};
+pub use kind::FractalKind;
+pub use reference::{compute_reference, compute_set_reference};
 #[cfg(target_arch = "wasm32")]
 pub use renderer::encode_png_with_progress;
 #[cfg(not(target_arch = "wasm32"))]

src/fractal/reference.rs

@@ -10,57 +10,9 @@
 //! * Mandelbrot-set: `z0 = 0`, `c = view center` (the c-plane point per pixel).
 //! * Julia-set:      `z0 = view center`, `c = fractal constant` (fixed per view).
 
+use super::kind::FractalKind;
 use crate::view::{Big, big_from_f64};
 
-/// The iteration formula. Must be kept in sync with `advance_delta` and the
-/// `KIND_*` constants in the shader.
-#[repr(u8)]
-#[derive(Clone, Copy, PartialEq, Eq, Debug)]
-pub enum FractalKind {
-    /// `z -> z^2 + c`.
-    Mandelbrot = 0,
-    /// `z -> (|Re z| + i|Im z|)^2 + c`.
-    BurningShip = 1,
-    /// `z -> conj(z)^2 + c` (the Mandelbar).
-    Tricorn = 2,
-    /// `z -> z^power + c` (power >= 2).
-    Multibrot = 3,
-    /// `z -> |Re(z^2)| + i·Im(z^2) + c` (abs on the real output of the square).
-    Celtic = 4,
-    /// `z -> (x^2 - y^2) - 2·x·|y|·i + c` (abs on the imaginary input).
-    Perpendicular = 5,
-    /// `z -> |Re(z^2)| - |Im(z^2)|·i + c` (abs on both outputs).
-    Buffalo = 6,
-    /// `z -> z^2 + c + p·z_{n-1}` (two-term recurrence; `p` is `phoenix_p`).
-    Phoenix = 7,
-    /// `z -> lambda·z(1 - z)` (logistic map).
-    Lambda = 8,
-    /// `z -> z^power + c`, where `power` is a complex constant (the
-    /// `complex_power` argument), via the principal branch `z^p = exp(p·ln z)`.
-    ComplexMultibrot = 9,
-}
-
-impl FractalKind {
-    pub fn description(&self) -> &str {
-        match self {
-            FractalKind::Mandelbrot => {
-                "The Mandelbrot set is the most famous fractal set, obtained with the simplest escape-time formula. This set represents all Julia fractals: each points of the Mandelbrot set is related to a specific Julia fractal."
-            }
-            FractalKind::BurningShip => {
-                "A variation of the famous Mandelbrot set, using absolute values on the real and imaginary part of each iterations."
-            }
-            FractalKind::Tricorn => "The Tricorn set is obtained using the same formula as the Mandelbrot set, taking the complex conjugate of the previous iteration.",
-            FractalKind::Multibrot => "Multibrot use the same formula as the Mandelbrot set, with a bigger exposant.",
-            FractalKind::Celtic => "",
-            FractalKind::Perpendicular => "",
-            FractalKind::Buffalo => "",
-            FractalKind::Phoenix => "",
-            FractalKind::Lambda => "",
-            FractalKind::ComplexMultibrot => "Like Multibrot, but the exponent itself is a complex number instead of a plain integer, via z^p = exp(p·ln z).",
-        }
-    }
-}
-
 /// Reference orbit escapes once |Z|^2 exceeds this. Kept larger than the pixel
 /// bailout so pixels escaping alongside the reference can still reach their
 /// bailout before the stored orbit runs out.

src/fractal/share.rs

@@ -39,21 +39,7 @@ impl ShareState {
     pub fn encode(&self) -> String {
         let mut s = String::new();
         s.push_str(if self.julia { "m=j" } else { "m=m" });
-        s.push_str(&format!(
-            "&f={}",
-            match self.kind {
-                FractalKind::Mandelbrot => "mandel",
-                FractalKind::BurningShip => "burning",
-                FractalKind::Multibrot => "multi",
-                FractalKind::Tricorn => "tricorn",
-                FractalKind::Celtic => "celtic",
-                FractalKind::Perpendicular => "perp",
-                FractalKind::Buffalo => "buffalo",
-                FractalKind::Phoenix => "phoenix",
-                FractalKind::Lambda => "lambda",
-                FractalKind::ComplexMultibrot => "cmulti",
-            }
-        ));
+        s.push_str(&format!("&f={}", self.kind.share_tag()));
         s.push_str(&format!("&pw={}", self.power));
         s.push_str(&format!(
             "&re={}&im={}&hh={}&it={}",
@@ -86,19 +72,7 @@ impl ShareState {
             julia: map.get("m").map(|m| *m == "j").unwrap_or(false),
             kind: map
                 .get("f")
-                .map(|f| match *f {
-                    "mandel" => FractalKind::Mandelbrot,
-                    "multi" => FractalKind::Multibrot,
-                    "burning" => FractalKind::BurningShip,
-                    "tricorn" => FractalKind::Tricorn,
-                    "celtic" => FractalKind::Celtic,
-                    "perp" => FractalKind::Perpendicular,
-                    "buffalo" => FractalKind::Buffalo,
-                    "phoenix" => FractalKind::Phoenix,
-                    "lambda" => FractalKind::Lambda,
-                    "cmulti" => FractalKind::ComplexMultibrot,
-                    _ => FractalKind::Mandelbrot,
-                })
+                .and_then(|f| FractalKind::from_share_tag(f))
                 .unwrap_or(FractalKind::Mandelbrot),
             power: map.get("pw").and_then(|s| s.parse().ok()).unwrap_or(2),
             center_re: (*map.get("re")?).to_string(),

src/headless.rs

@@ -33,7 +33,7 @@ pub fn run(cli: Cli) -> Result<(), String> {
     app.compute_reference_blocking();
 
     let (device, queue) = pollster::block_on(request_device())?;
-    let format = wgpu::TextureFormat::Rgba8UnormSrgb;
+    let format = wgpu::TextureFormat::Bgra8Unorm;
     let renderer = FractalRenderer::new(&device, format);
     let (pipeline, bind_group_layout, format) = renderer.export_handles();