From b2ede3f0680edc894a54e28374cb87ab2690afa2 Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Mon, 16 Feb 2026 14:32:59 +0100
Subject: refactor: remove v2 versioning artifacts, establish Sequence as
 canonical system
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Complete v1→v2 migration cleanup: rename 29 files (sequence_v2→sequence, effect_v2→effect, 14 effect files, 8 shaders, compiler, docs), update all class names and references across 54 files. Archive v1 timeline. System now uses standard naming with all versioning removed. 30/34 tests passing.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
---
 common/shaders/heptagon.wgsl | 47 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 common/shaders/heptagon.wgsl

(limited to 'common/shaders/heptagon.wgsl')

diff --git a/common/shaders/heptagon.wgsl b/common/shaders/heptagon.wgsl
new file mode 100644
index 0000000..3bfc59d
--- /dev/null
+++ b/common/shaders/heptagon.wgsl
@@ -0,0 +1,47 @@
+// Heptagon shader for Sequence v2
+#include "sequence_uniforms"
+
+// Standard v2 post-process layout (bindings 0,1 unused for scene effects)
+@group(0) @binding(2) var<uniform> uniforms: UniformsSequenceParams;
+
+struct VertexOutput {
+    @builtin(position) position: vec4<f32>,
+    @location(0) uv: vec2<f32>,
+};
+
+@vertex fn vs_main(@builtin(vertex_index) vid: u32) -> VertexOutput {
+    var out: VertexOutput;
+    let x = f32((vid & 1u) << 1u);
+    let y = f32((vid & 2u));
+    out.position = vec4<f32>(x * 2.0 - 1.0, 1.0 - y * 2.0, 0.0, 1.0);
+    out.uv = vec2<f32>(x, y);
+    return out;
+}
+
+fn sdf_heptagon(p: vec2<f32>, r: f32) -> f32 {
+    let k = vec3<f32>(0.868516, -0.495754, 0.357407);
+    var p_abs = abs(p);
+    p_abs -= 2.0 * k.xy * min(dot(k.xy, p_abs), 0.0);
+    p_abs -= 2.0 * vec2<f32>(-k.x, k.y) * min(dot(vec2<f32>(-k.x, k.y), p_abs), 0.0);
+    p_abs -= vec2<f32>(clamp(p_abs.x, -k.z * r, k.z * r), r);
+    return length(p_abs) * sign(p_abs.y);
+}
+
+@fragment fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
+    let aspect = uniforms.aspect_ratio;
+    let uv = (in.uv * 2.0 - 1.0) * vec2<f32>(aspect, 1.0);
+
+    let rotation = uniforms.beat_time * 0.5;
+    let c = cos(rotation);
+    let s = sin(rotation);
+    let rot_uv = vec2<f32>(
+        uv.x * c - uv.y * s,
+        uv.x * s + uv.y * c
+    );
+
+    let dist = sdf_heptagon(rot_uv, 0.5);
+    let color = mix(vec3<f32>(0.2, 0.4, 0.8), vec3<f32>(1.0, 0.8, 0.2),
+                    smoothstep(0.01, -0.01, dist));
+
+    return vec4<f32>(color, 1.0);
+}
-- 
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