Added mip selection using ray differentials

header/Lighting/Light.h

@@ -20,6 +20,8 @@ typedef struct
 
     const bvh_tree_t* bvh_tree;
     const texture_collection_t* textures;
+
+    float spread_angle;
 } light_shading_context_t;
 
 typedef path_output (*evaluate_bsdf_sky_f) (const void* data, const light_shading_context_t* context, vec3s throughput, uint32_t sample_index);