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, 5 insertions, 0 deletions

diff --git a/src/procedural/generator.h b/src/procedural/generator.h
index a5ced68..8a9e757 100644
--- a/src/procedural/generator.h
+++ b/src/procedural/generator.h
@@ -24,4 +24,9 @@ void gen_noise(uint8_t* buffer, int w, int h, const float* params,
 void gen_grid(uint8_t* buffer, int w, int h, const float* params,
               int num_params);
 
+// Post-process: Make texture periodic by blending edges
+// Params[0]: Border size ratio (0.0 - 0.5), default 0.1
+void make_periodic(uint8_t* buffer, int w, int h, const float* params,
+                   int num_params);
+
 } // namespace procedural