Module brdf 

Complete BRDF (Bidirectional Reflectance Distribution Function) library.

Pure CPU math — no GPU types. All functions use glam::{Vec2, Vec3} and bare f32. Organised into:

• distribution — microfacet normal-distribution functions (D)
• geometry — masking/shadowing functions (G)
• fresnel — Fresnel reflectance functions (F)
• vec3 — Vec3 helpers used throughout
• [brdf] — full BRDF evaluators (Cook-Torrance, Lambertian, …)
• ibl — image-based lighting helpers
• [lights] — light types and shading loop
• tonemap — tone-mapping operators
• [glsl] — GLSL source generation

Re-exports

pub use tonemap::ToneMapOp;

Modules

distribution

Microfacet normal-distribution functions.

fresnel

Fresnel reflectance functions.

geometry

Microfacet masking-shadowing functions.

ibl

Image-based lighting helpers.

tonemap

Tone-mapping operators for converting HDR radiance to display-ready LDR.

vec3

Lightweight Vec3 helper functions used throughout the BRDF library.

Structs

AnisotropicBrdf

Anisotropic GGX BRDF.

AreaLight

Rectangular area light using the Linearly Transformed Cosines (LTC) approach.

BrdfGlsl

Generates GLSL source strings for the BRDF functions in this module.

ClearcoatBrdf

Clearcoat BRDF layer — a thin dielectric coat on top of the base material.

CookTorranceBrdf

Cook-Torrance specular BRDF combined with Lambertian diffuse.

DirectionalLight

Directional (sun-like) light — no position, infinite distance.

LambertianBrdf

Lambertian (perfectly diffuse) BRDF.

OrenNayarBrdf

Oren-Nayar BRDF for rough diffuse surfaces.

PointLight

Omnidirectional point light.

ShadeMaterial

Combined material description used by shade_point.

SimpleRng

Simple xorshift32 PRNG used for Monte Carlo BRDF sampling. Not suitable for cryptography — only for rendering randomness.

SpotLight

Spot light — cone-shaped.

Enums

Light

Light enum for the shading loop.

Functions

shade_point

Full shading of a surface point given material, lights, geometry, and an optional IBL environment.