refactor: Shader Asset Integration (Task #24)

Extracted all hardcoded WGSL shaders into external assets. Updated AssetManager to handle shader snippets. Refactored Renderer3D, VisualDebug, and Effects to load shaders via the AssetManager, enabling better shader management and composition.

1 files changed, 16 insertions, 0 deletions

diff --git a/assets/final/shaders/ray_box.wgsl b/assets/final/shaders/ray_box.wgsl
new file mode 100644
index 0000000..d56ea1b
--- /dev/null
+++ b/assets/final/shaders/ray_box.wgsl
@@ -0,0 +1,16 @@
+struct RayBounds {
+    t_entry: f32,
+    t_exit: f32,
+    hit: bool,
+};
+
+fn ray_box_intersection(ro: vec3<f32>, rd: vec3<f32>, extent: vec3<f32>) -> RayBounds {
+    let inv_rd = 1.0 / rd;
+    let t0 = (-extent - ro) * inv_rd;
+    let t1 = (extent - ro) * inv_rd;
+    let tmin_vec = min(t0, t1);
+    let tmax_vec = max(t0, t1);
+    let t_entry = max(0.0, max(tmin_vec.x, max(tmin_vec.y, tmin_vec.z)));
+    let t_exit = min(tmax_vec.x, min(tmax_vec.y, tmax_vec.z));
+    return RayBounds(t_entry, t_exit, t_entry <= t_exit);
+}