From 2e34965e5e48175c5ee6016af1a858f7f3f02c1d Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Wed, 4 Feb 2026 11:56:03 +0100
Subject: feat(gpu): Implement recursive WGSL composition and modularize
 shaders (Task #50)

- Updated ShaderComposer to support recursive #include "snippet_name" with cycle detection.
- Extracted granular WGSL snippets: math/sdf_shapes, math/sdf_utils, render/shadows, render/scene_query, render/lighting_utils.
- Refactored Renderer3D to use #include in shaders, simplifying C++ dependency lists.
- Fixed WGPUShaderSourceWGSL usage on macOS to correctly handle composed shader strings.
- Added comprehensive unit tests for recursive composition in test_shader_composer.
- Verified system stability with test_3d_render and full test suite.
- Marked Task #50 as recurrent for future code hygiene.
---
 assets/final/shaders/render/scene_query.wgsl | 33 ++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 assets/final/shaders/render/scene_query.wgsl

(limited to 'assets/final/shaders/render/scene_query.wgsl')

diff --git a/assets/final/shaders/render/scene_query.wgsl b/assets/final/shaders/render/scene_query.wgsl
new file mode 100644
index 0000000..b58f28c
--- /dev/null
+++ b/assets/final/shaders/render/scene_query.wgsl
@@ -0,0 +1,33 @@
+#include "math/sdf_shapes"
+
+fn get_dist(p: vec3<f32>, obj_type: f32) -> f32 {
+    if (obj_type == 1.0) { return length(p) - 1.0; } // Unit Sphere
+    if (obj_type == 2.0) { return sdBox(p, vec3<f32>(1.0)); } // Unit Box
+    if (obj_type == 3.0) { return sdTorus(p, vec2<f32>(1.0, 0.4)); } // Unit Torus
+    if (obj_type == 4.0) { return sdPlane(p, vec3<f32>(0.0, 1.0, 0.0), 0.0); }
+    return 100.0;
+}
+
+fn map_scene(p: vec3<f32>, skip_idx: u32) -> f32 {
+    var d = 1000.0;
+    let count = u32(globals.params.x);
+    
+    for (var i = 0u; i < count; i = i + 1u) {
+        if (i == skip_idx) { continue; }
+        let obj = object_data.objects[i];
+        let obj_type = obj.params.x;
+        // Skip rasterized objects (like the floor) in the SDF map
+        if (obj_type <= 0.0) { continue; } 
+
+        let q = (obj.inv_model * vec4<f32>(p, 1.0)).xyz;
+        
+        let scale_x = length(obj.model[0].xyz);
+        let scale_y = length(obj.model[1].xyz);
+        let scale_z = length(obj.model[2].xyz);
+        // Use conservative minimum scale to avoid overstepping the distance field
+        let s = min(scale_x, min(scale_y, scale_z));
+        
+        d = min(d, get_dist(q, obj_type) * s);
+    }
+    return d;
+}
-- 
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