From 19d831c5b1d56070c193d0c8310272f34ad3160d Mon Sep 17 00:00:00 2001
From: Mica White <botahamec@outlook.com>
Date: Mon, 8 Dec 2025 19:50:10 -0500
Subject: Stuff

---
 alligator.wgsl | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 alligator.wgsl

(limited to 'alligator.wgsl')

diff --git a/alligator.wgsl b/alligator.wgsl
new file mode 100644
index 0000000..319db89
--- /dev/null
+++ b/alligator.wgsl
@@ -0,0 +1,90 @@
+const SQRT_2: f32 = 0.70710678118654757;
+
+struct VertexInput {
+	@location(0) position: vec2<f32>,
+	@location(1) curve_uv: vec2<f32>,
+	@location(2) color_uv: vec2<f32>,
+	@location(3) color1: vec4<f32>,
+	@location(4) color2: vec4<f32>,
+	@location(5) color3: vec4<f32>,
+	@location(6) color4: vec4<f32>,
+	@location(7) normal_uv: vec2<f32>,
+	@location(8) normal1: vec3<f32>,
+	@location(9) normal2: vec3<f32>,
+	@location(10) normal3: vec3<f32>,
+	@location(11) normal4: vec3<f32>,
+}
+
+struct VertexOutput {
+	@builtin(position) position: vec4<f32>,
+	@location(0) curve_uv: vec2<f32>,
+	@location(1) color_uv: vec2<f32>,
+	@location(2) color1: vec4<f32>,
+	@location(3) color2: vec4<f32>,
+	@location(4) color3: vec4<f32>,
+	@location(5) color4: vec4<f32>,
+	@location(6) normal_uv: vec2<f32>,
+	@location(7) normal1: vec3<f32>,
+	@location(8) normal2: vec3<f32>,
+	@location(9) normal3: vec3<f32>,
+	@location(10) normal4: vec3<f32>,
+}
+
+fn square(in: f32) -> f32 {
+	return in * in;
+}
+
+fn cube(in: f32) -> f32 {
+	return in * in * in;
+}
+
+fn lerp(a: vec3<f32>, b: vec3<f32>, t: f32) -> vec3<f32> {
+	return (b - a) * t + a;
+}
+
+fn oklab_to_linear_srgb(color: vec3<f32>) -> vec3<f32> {
+	let l = cube(color.r + 0.3963377774 * color.g + 0.2158037573 * color.b);
+	let m = cube(color.r - 0.1055613458 * color.g - 0.0638541728 * color.b);
+	let s = cube(color.r - 0.0894841775 * color.g - 1.2914855480 * color.b);
+
+	return vec3<f32>(
+		4.0767416621 * l - 3.3077115913 * m + 0.2309699292 * s,
+		-1.2684380046 * l + 2.6097574011 * m - 0.3413193965 * s,
+		-0.0041960863 * l - 0.7034186147 * m + 1.7076147010 * s,
+	);
+}
+
+@vertex
+fn vs_main(vertex: VertexInput) -> VertexOutput {
+	var out: VertexOutput;
+	out.position = vec4(vertex.position, 1.0, 1.0);
+	out.curve_uv = vertex.curve_uv;
+	out.color_uv = vertex.color_uv;
+	out.color1 = vertex.color1;
+	out.color2 = vertex.color2;
+	out.color3 = vertex.color3;
+	out.color4 = vertex.color4;
+	out.normal_uv = vertex.normal_uv;
+	out.normal1 = vertex.normal1;
+	out.normal2 = vertex.normal2;
+	out.normal3 = vertex.normal3;
+	out.normal4 = vertex.normal4;
+	return out;
+}
+
+@fragment
+fn fs_main(vertex: VertexOutput) -> @location(0) vec4<f32> {
+	let radius = length(vertex.curve_uv);
+	let afwidth = length(vec2(dpdxFine(radius), dpdyFine(radius))) * SQRT_2;
+	let in_circle = 1.0 - smoothstep(1.0 - afwidth, 1.0 + afwidth, radius);
+
+	let inside_color = oklab_to_linear_srgb(lerp(vertex.color1.rgb, vertex.color2.rgb, length(vertex.color_uv)));
+	let outside_color = oklab_to_linear_srgb(lerp(vertex.color3.rgb, vertex.color4.rgb, 1.0 - length(vertex.color_uv)));
+	let color = lerp(outside_color, inside_color, in_circle);
+
+	let inside_normal = lerp(vertex.normal1, vertex.normal2, length(vertex.normal_uv));
+	let outside_normal = lerp(vertex.normal3, vertex.normal4, 1.0 - length(vertex.normal_uv));
+	let normal = lerp(outside_normal, inside_normal, in_circle);
+
+	return vec4<f32>(color, in_circle);
+}
\ No newline at end of file
-- 
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