feat: Add seamless bump mapping with procedural noise

- Replaced white noise with smooth value-like noise.
- Implemented periodic texture generation (seam blending).
- Integrated bump mapping into Renderer3D using finite difference of displaced SDF.
- Updated test_3d_render with noise texture and multiple SDF shapes (Box, Sphere, Torus).

1 files changed, 8 insertions, 2 deletions

diff --git a/src/3d/renderer.h b/src/3d/renderer.h
index 0dadc32..dda6229 100644
--- a/src/3d/renderer.h
+++ b/src/3d/renderer.h
@@ -30,7 +30,10 @@ class Renderer3D {
 
   // Renders the scene to the given texture view
   void render(const Scene& scene, const Camera& camera, float time,
-              WGPUTextureView target_view, WGPUTextureView depth_view_opt = nullptr);
+              WGPUTextureView target_view,
+              WGPUTextureView depth_view_opt = nullptr);
+
+  void set_noise_texture(WGPUTextureView noise_view);
 
   // Resize handler (if needed for internal buffers)
   void resize(int width, int height);
@@ -48,7 +51,10 @@ class Renderer3D {
   WGPUBindGroup bind_group_ = nullptr;
   WGPUBuffer global_uniform_buffer_ = nullptr;
   WGPUBuffer object_storage_buffer_ = nullptr;
-  
+
+  WGPUTextureView noise_texture_view_ = nullptr;
+  WGPUSampler default_sampler_ = nullptr;
+
   // Depth buffer management
   WGPUTexture depth_texture_ = nullptr;
   WGPUTextureView depth_view_ = nullptr;