From a109983c194c45ad85f0e481232bc605c7cfd85b Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Fri, 13 Feb 2026 08:34:24 +0100
Subject: Remediation: Implement shared common/shaders/ directory

Eliminates 36 duplicate shader files across workspaces.

Structure:
- common/shaders/{math,render,compute}/ - Shared utilities (20 files)
- workspaces/*/shaders/ - Workspace-specific only

Changes:
- Created common/shaders/ with math, render, compute subdirectories
- Moved 20 common shaders from workspaces to common/
- Removed duplicates from test workspace
- Updated assets.txt: ../../common/shaders/ references
- Enhanced asset_packer.cc: filesystem path normalization for ../ resolution

Implementation: Option 1 from SHADER_REUSE_INVESTIGATION.md
- Single source of truth for common code
- Workspace references via relative paths
- Path normalization in asset packer

handoff(Claude): Common shader directory implemented
---
 common/shaders/compute/gen_noise.wgsl | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 common/shaders/compute/gen_noise.wgsl

(limited to 'common/shaders/compute/gen_noise.wgsl')

diff --git a/common/shaders/compute/gen_noise.wgsl b/common/shaders/compute/gen_noise.wgsl
new file mode 100644
index 0000000..5c0babd
--- /dev/null
+++ b/common/shaders/compute/gen_noise.wgsl
@@ -0,0 +1,26 @@
+// GPU procedural noise texture generator.
+// Uses compute shader for parallel texture generation.
+
+#include "math/noise"
+
+struct NoiseParams {
+  width: u32,
+  height: u32,
+  seed: f32,
+  frequency: f32,
+}
+
+@group(0) @binding(0) var output_tex: texture_storage_2d<rgba8unorm, write>;
+@group(0) @binding(1) var<uniform> params: NoiseParams;
+
+@compute @workgroup_size(8, 8, 1)
+fn main(@builtin(global_invocation_id) id: vec3<u32>) {
+  if (id.x >= params.width || id.y >= params.height) { return; }
+
+  let uv = vec2<f32>(f32(id.x) / f32(params.width),
+                      f32(id.y) / f32(params.height));
+  let p = uv * params.frequency + params.seed;
+  let noise = noise_2d(p);
+
+  textureStore(output_tex, id.xy, vec4<f32>(noise, noise, noise, 1.0));
+}
-- 
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