deprecate cabs_squared in favour of length, remove deprecated functions from readme

Author: arthomnix

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "fractal_viewer"
-version = "0.5.0"
+version = "0.5.1"
 edition = "2021"
 description = "Cross-platform GPU-accelerated viewer for the Mandelbrot set and related fractals"
 repository = "https://github.com/arthomnix/fractal_viewer"

Cargo.toml

@@ -6,8 +6,6 @@ A cross-platform, GPU-accelerated viewer for the Mandelbrot Set and related frac
 Scroll wheel to zoom, click and drag to pan. Change the initial value of z or c by right-clicking.
 
 Custom functions should be valid WGSL expressions, with the following extra functions available:
-* `cabs(vec2<f32>) -> f32`: absolute value of a complex number (deprecated: use builtin length(z) instead)
-* `cabs_squared(vec2<f32>) -> f32`: square of the absolute value of a complex number, (marginally) faster as it avoids a square root
 * `csquare(vec2<f32>) -> vec2<f32>`: square of a complex number
 * `cpow(vec2<f32>, f32) -> vec2<f32>`: real power of a complex number (can cause precision issues)
 * `ccpow(vec2<f32>, vec2<f32>) -> vec2<f32>`: complex power of a complex number

README.MD

@@ -702,8 +702,8 @@ impl State {
                         ui.add(
                             egui::Slider::new(
                                 &mut self.settings.escape_threshold,
-                                1.0..=13043817825300000000.0,
-                            ) // approximate square root of maximum f32
+                                1.0..=f32::MAX,
+                            )
                                 .logarithmic(true),
                         );
                     });

src/lib.rs

@@ -27,6 +27,7 @@ fn vs_main(@builtin(vertex_index) in_vertex_index: u32) -> @builtin(position) ve
     return vertex_positions[in_vertex_index];
 }
 
+// deprecated: use length(z)^2 instead
 fn cabs_squared(z: vec2<f32>) -> f32 {
     return (z.x * z.x + z.y * z.y);
 }
@@ -113,7 +114,7 @@ fn get_fragment_colour(c: vec2<f32>) -> vec4<f32> {
 
         for (
             z += uniforms.initial_value;
-            cabs_squared(z) < uniforms.escape_threshold * uniforms.escape_threshold;
+            length(z) < uniforms.escape_threshold;
             z = REPLACE_FRACTAL_EQN // gets replaced by user-defined expression
         ) {
             i++;
@@ -129,7 +130,7 @@ fn get_fragment_colour(c: vec2<f32>) -> vec4<f32> {
         z = c;
         var c: vec2<f32> = uniforms.initial_value;
         for (;
-            cabs_squared(z) < uniforms.escape_threshold * uniforms.escape_threshold;
+            length(z) < uniforms.escape_threshold;
             z = REPLACE_FRACTAL_EQN // gets replaced by user-defined expression
         ) {
             i++;