Refactor: Reorganize workspaces and remove assets/ directory

Workspace structure now:
- workspaces/{main,test}/obj/      (3D models)
- workspaces/{main,test}/shaders/  (WGSL shaders)
- workspaces/{main,test}/music/    (audio samples)

Changes:
- Moved workspaces/*/assets/music/ → workspaces/*/music/
- Updated assets.txt paths (assets/music/ → music/)
- Moved test_demo.{seq,track} to tools/
- Moved assets/originals/ → tools/originals/
- Removed assets/common/ (legacy, duplicated in workspaces)
- Removed assets/final/ (legacy, superseded by workspaces)
- Updated hot-reload paths in main.cc
- Updated CMake references for test_demo and validation
- Updated gen_spectrograms.sh paths

handoff(Claude): Workspace reorganization complete

1 files changed, 0 insertions, 167 deletions

diff --git a/assets/final/shaders/renderer_3d.wgsl b/assets/final/shaders/renderer_3d.wgsl
deleted file mode 100644
index d3b0bae..0000000
--- a/assets/final/shaders/renderer_3d.wgsl
+++ /dev/null
@@ -1,167 +0,0 @@
-#include "common_uniforms"
-#include "math/common_utils"
-#include "math/sdf_utils"
-
-@group(0) @binding(0) var<uniform> globals: GlobalUniforms;
-@group(0) @binding(1) var<storage, read> object_data: ObjectsBuffer;
-
-// Binding 2 is reserved for BVH buffer when enabled
-
-@group(0) @binding(3) var noise_tex: texture_2d<f32>;
-@group(0) @binding(4) var noise_sampler: sampler;
-@group(0) @binding(5) var sky_tex: texture_2d<f32>;
-
-struct VertexOutput {
-    @builtin(position) position: vec4<f32>,
-    @location(0) local_pos: vec3<f32>,
-    @location(1) color: vec4<f32>,
-    @location(2) @interpolate(flat) instance_index: u32,
-    @location(3) world_pos: vec3<f32>,
-    @location(4) transformed_normal: vec3<f32>,
-};
-
-@vertex
-fn vs_main(@builtin(vertex_index) vertex_index: u32, 
-           @builtin(instance_index) instance_index: u32) -> VertexOutput {
-    
-    var pos = array<vec3<f32>, 36>(
-        vec3(-1.0, -1.0,  1.0), vec3( 1.0, -1.0,  1.0), vec3( 1.0,  1.0,  1.0),
-        vec3(-1.0, -1.0,  1.0), vec3( 1.0,  1.0,  1.0), vec3(-1.0,  1.0,  1.0),
-        vec3(-1.0, -1.0, -1.0), vec3(-1.0,  1.0, -1.0), vec3( 1.0,  1.0, -1.0),
-        vec3(-1.0, -1.0, -1.0), vec3( 1.0,  1.0, -1.0), vec3( 1.0, -1.0, -1.0),
-        vec3(-1.0,  1.0, -1.0), vec3(-1.0,  1.0,  1.0), vec3( 1.0,  1.0,  1.0),
-        vec3(-1.0,  1.0, -1.0), vec3( 1.0,  1.0,  1.0), vec3( 1.0,  1.0, -1.0),
-        vec3(-1.0, -1.0, -1.0), vec3( 1.0, -1.0, -1.0), vec3( 1.0, -1.0,  1.0),
-        vec3(-1.0, -1.0, -1.0), vec3( 1.0, -1.0,  1.0), vec3(-1.0, -1.0,  1.0),
-        vec3( 1.0, -1.0, -1.0), vec3( 1.0,  1.0, -1.0), vec3( 1.0,  1.0,  1.0),
-        vec3( 1.0, -1.0, -1.0), vec3( 1.0,  1.0,  1.0), vec3( 1.0, -1.0,  1.0),
-        vec3(-1.0, -1.0, -1.0), vec3(-1.0, -1.0,  1.0), vec3(-1.0,  1.0,  1.0),
-        vec3(-1.0, -1.0, -1.0), vec3(-1.0,  1.0,  1.0), vec3(-1.0,  1.0, -1.0)
-    );
-
-    var p = pos[vertex_index];
-    let obj = object_data.objects[instance_index];
-    let obj_type = obj.params.x;
-
-    if (obj_type == 5.0) { // MESH
-        // For meshes, we use the actual vertex data, not proxy geometry.
-        // The position here is a placeholder, the real mesh data is handled by mesh_pipeline_.
-        var out: VertexOutput;
-        out.position = vec4<f32>(0.0, 0.0, 2.0, 1.0); // Outside far plane, so it's not rendered by this pipeline.
-        return out;
-    }
-
-    // Tight fit for Torus proxy hull (major radius 1.0, minor 0.4)
-    if (obj_type == 3.0) {
-        p.x = p.x * 1.5;
-        p.z = p.z * 1.5;
-        p.y = p.y * 0.5;
-    }
-
-    let world_pos = obj.model * vec4<f32>(p, 1.0);
-    let clip_pos = globals.view_proj * world_pos;
-
-    var out: VertexOutput;
-    out.position = clip_pos;
-    out.local_pos = p; 
-    out.color = obj.color;
-    out.instance_index = instance_index;
-    out.world_pos = world_pos.xyz;
-
-    // For SDF primitives, we don't use vertex normals - they are computed analytically in the fragment shader.
-    // This field is only used by the mesh pipeline (mesh_render.wgsl), not this SDF pipeline.
-    out.transformed_normal = normalize(vec3<f32>(0.0, 1.0, 0.0)); // Placeholder
-
-    return out;
-}
-
-#include "render/scene_query_mode"
-#include "render/shadows"
-#include "render/lighting_utils"
-#include "ray_box"
-
-struct FragmentOutput {
-    @location(0) color: vec4<f32>,
-    @builtin(frag_depth) depth: f32,
-};
-
-@fragment
-fn fs_main(in: VertexOutput) -> FragmentOutput {
-    let obj = object_data.objects[in.instance_index];
-    let obj_type = obj.params.x;
-
-    var p: vec3<f32>;
-    var normal: vec3<f32>;
-    var base_color = in.color.rgb;
-    let light_dir = normalize(vec3<f32>(1.0, 1.0, 1.0)); 
-
-    if (obj_type <= 0.0) { // Raster path (legacy or generic)
-        p = in.world_pos;
-        // Use the transformed normal passed from the vertex shader for rasterized objects
-        normal = normalize(in.transformed_normal);
-
-        // Apply grid pattern to floor
-        let uv = p.xz * 0.5;
-        let grid_val = grid_pattern(uv);
-        base_color = base_color * (0.5 + 0.5 * grid_val);
-    } else { // SDF path
-        let ro_world = globals.camera_pos_time.xyz;
-        let rd_world = normalize(in.world_pos - ro_world);
-        
-        // Ray-Box Intersection in local space to find tight bounds
-        let ro_local = (obj.inv_model * vec4<f32>(ro_world, 1.0)).xyz;
-        let rd_local = normalize((obj.inv_model * vec4<f32>(rd_world, 0.0)).xyz);
-        
-        // Proxy box extent (matches vs_main)
-        // MESHES use obj.params.yzw for extent
-        var extent = vec3<f32>(1.0);
-        if (obj.params.x == 3.0) { extent = vec3<f32>(1.5, 0.5, 1.5); } // Torus
-        else if (obj.params.x == 5.0) { extent = obj.params.yzw; } // MESH extent
-        
-        let bounds = ray_box_intersection(ro_local, rd_local, extent);
-
-        if (!bounds.hit) { discard; }
-
-        var t = bounds.t_entry;
-        var hit = false;
-        for (var i = 0; i < 64; i = i + 1) {
-            let q = ro_local + rd_local * t;
-            let d_local = get_dist(q, obj.params);
-            if (d_local < 0.0005) { hit = true; break; }
-            t = t + d_local;
-            if (t > bounds.t_exit) { break; }
-        }
-        if (!hit) { discard; }
-        
-        let q_hit = ro_local + rd_local * t;
-        p = (obj.model * vec4<f32>(q_hit, 1.0)).xyz; // Correct world position
-        
-        // Calculate normal with bump mapping (using utility function)
-        let disp_strength = 0.05;
-        let n_local = get_normal_bump(q_hit, obj.params, noise_tex, noise_sampler, disp_strength);
-        normal = transform_normal(obj.inv_model, n_local);
-
-        // Apply texture to SDF color
-        if (in.instance_index == 0u || obj_type == 4.0) { // Floor (index 0) or PLANE
-            let uv_grid = p.xz * 0.5;
-            let grid_val = grid_pattern(uv_grid);
-            base_color = base_color * (0.5 + 0.5 * grid_val);
-        } else {
-            let uv_hit = spherical_uv(q_hit);
-            let tex_val = textureSample(noise_tex, noise_sampler, uv_hit).r;
-            base_color = base_color * (0.7 + 0.3 * tex_val);
-        }
-    }
-
-    let shadow = calc_shadow(p, light_dir, 0.05, 20.0, in.instance_index);
-    let lit_color = calculate_lighting(base_color, normal, p, shadow);
-    
-    var out: FragmentOutput;
-    out.color = vec4<f32>(lit_color, 1.0);
-    
-    // Calculate and write correct depth
-    let clip_pos = globals.view_proj * vec4<f32>(p, 1.0);
-    out.depth = clip_pos.z / clip_pos.w;
-    
-    return out;
-}
\ No newline at end of file