46 lines
No EOL
1.3 KiB
HLSL
46 lines
No EOL
1.3 KiB
HLSL
#include "common/schlick.hlsl"
|
|
#include "../math/pow5.hlsl"
|
|
|
|
/*
|
|
contributors: Patricio Gonzalez Vivo
|
|
description: Resolve fresnel coeficient
|
|
use:
|
|
- <float3> fresnel(const <float3> f0, <float> NoV)
|
|
- <float3> fresnel(const <float3> f0, <float> NoV, float roughness)
|
|
license:
|
|
- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
|
|
- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
|
|
*/
|
|
|
|
#ifndef FNC_FRESNEL
|
|
#define FNC_FRESNEL
|
|
|
|
float3 fresnel(const in float3 f0, float3 normal, float3 view)
|
|
{
|
|
return schlick(f0, 1.0, dot(view, normal));
|
|
}
|
|
|
|
float3 fresnel(const float3 f0, float NoV)
|
|
{
|
|
#if defined(TARGET_MOBILE) || defined(PLATFORM_RPI)
|
|
return schlick(f0, 1.0, NoV);
|
|
#else
|
|
float f90 = saturate(dot(f0, float3(50.0, 50.0, 50.0) * 0.33));
|
|
return schlick(f0, f90, NoV);
|
|
#endif
|
|
}
|
|
|
|
float fresnel(const in float f0, const in float NoV)
|
|
{
|
|
return schlick(f0, 1.0, NoV);
|
|
}
|
|
|
|
// Roughness-adjusted fresnel function to attenuate high speculars at glancing angles
|
|
// Very useful when used with filtered environment maps
|
|
// See https://seblagarde.wordpress.com/2011/08/17/hello-world/
|
|
float3 fresnel(float3 f0, float NoV, float roughness)
|
|
{
|
|
return f0 + (max(1.0 - roughness, f0) - f0) * pow5(1.0-NoV);
|
|
}
|
|
|
|
#endif |