pbr_functions.glsl File Reference

Functions
vec2	dirToUV (vec3 v)
vec3	fresnelSchlickRoughness (float cosTheta, vec3 F0, float roughness)
vec3	compute_IBL_PBR_Advanced (vec3 N, vec3 V, vec3 R, vec3 F0, float NdotV, vec3 albedo, float metallic, float roughness, float ao, vec3 worldPos)
float	compute_specular_aa_roughness (vec3 N, float roughness, float projectedCurvature)
float	compute_roughness_clamping_analytic (float roughness, float curvature)
float	compute_roughness_clamping (vec3 N, float roughness)
vec3	compute_pbr_stable (vec3 N, vec3 V, vec3 albedo, float metallic, float roughness, float ao, vec3 worldPos, float curvature)
vec3	compute_pbr (vec3 N, vec3 V, vec3 albedo, float metallic, float roughness, float ao, vec3 worldPos)
vec3	compute_debug (vec3 N, vec3 V, vec3 albedo, float metallic, float roughness, float ao, int debugMode, vec3 worldPos)

Variables
header sh_probe	glsl
const float	PI = 3.14159265359
const float	INV_PI = 0.31830988618
const float	EPSILON = 1e-6

Function Documentation

compute_debug()

vec3 compute_debug	(	vec3	N,
		vec3	V,
		vec3	albedo,
		float	metallic,
		float	roughness,
		float	ao,
		int	debugMode,
		vec3	worldPos
	)

Here is the call graph for this function:

compute_IBL_PBR_Advanced()

vec3 compute_IBL_PBR_Advanced	(	vec3	N,
		vec3	V,
		vec3	R,
		vec3	F0,
		float	NdotV,
		vec3	albedo,
		float	metallic,
		float	roughness,
		float	ao,
		vec3	worldPos
	)

Here is the call graph for this function:

compute_pbr()

vec3 compute_pbr	(	vec3	N,
		vec3	V,
		vec3	albedo,
		float	metallic,
		float	roughness,
		float	ao,
		vec3	worldPos
	)

Here is the call graph for this function:

compute_pbr_stable()

vec3 compute_pbr_stable	(	vec3	N,
		vec3	V,
		vec3	albedo,
		float	metallic,
		float	roughness,
		float	ao,
		vec3	worldPos,
		float	curvature
	)

Here is the call graph for this function:

compute_roughness_clamping()

float compute_roughness_clamping	(	vec3	N,
		float	roughness
	)

compute_roughness_clamping_analytic()

float compute_roughness_clamping_analytic	(	float	roughness,
		float	curvature
	)

Analytic Roughness Clamping (Hardware Independent)

Parameters

roughness	The original perceptual roughness
curvature	The geometric curvature (e.g., 1.0 / Radius for spheres)

compute_specular_aa_roughness()

float compute_specular_aa_roughness	(	vec3	N,
		float	roughness,
		float	projectedCurvature
	)

Generic Screen-Space Roughness Clamping (Hardware Dependent)

Note

This uses GPU derivatives (dFdx/dFdy) which differ between vendors.

Currently disabled to ensure bit-perfect "ISO" rendering across GPUs. Screen-Space Specular Semi-Analytic Anti-Aliasing. Uses the Varef (Variance-based Roughness) technique.

Parameters

N	Normal vector in world space.
roughness	Perceptual roughness (0-1).
projectedCurvature	Pixel size in world space / Geo Radius (Analytic AA).

dirToUV()

vec2 dirToUV

(

vec3

v

)

fresnelSchlickRoughness()

vec3 fresnelSchlickRoughness	(	float	cosTheta,
		vec3	F0,
		float	roughness
	)

Variable Documentation

EPSILON

const float EPSILON = 1e-6

glsl

header postprocess lut3d glsl

INV_PI

const float INV_PI = 0.31830988618

PI

const float PI = 3.14159265359