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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "principledMaterialFresnel.glsllib"
// See https://disney-animation.s3.amazonaws.com/library/s2012_pbs_disney_brdf_notes_v2.pdf
vec4 qt_diffuseBurleyBSDF(in vec3 normal, in vec3 lightDirection, in vec3 viewVector, in vec3 lightDiffuse, in float roughness)
{
vec3 H = normalize(viewVector + lightDirection);
float cLdotH = max(0.0, dot(lightDirection, H));
float cNdotV = max(0.0, dot(normal, viewVector));
float cNdotL = max(0.0, dot(normal, lightDirection));
float fLight = qt_schlick(cNdotL);
float fView = qt_schlick(cNdotV);
float fDiffuse90 = 0.5 + 2.0 * cLdotH * cLdotH * roughness;
float fDiffuse = mix(1.0, fDiffuse90, fLight) * mix(1.0, fDiffuse90, fView);
float factor = fDiffuse * cNdotL;
return vec4(factor * lightDiffuse, 1.0);
}
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