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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
// Blinn-Phong
vec4 qt_specularBlinnPhong(in vec3 N, in vec3 L, in vec3 V, in vec3 lightSpecular, in float shininess)
{
vec4 rgba = vec4(0.0, 0.0, 0.0, 1.0);
vec3 H = normalize(V + L);
float cosAlpha = max(0.0, dot(H, N));
float shine = pow(cosAlpha, shininess);
rgba.rgb = shine * lightSpecular;
return rgba;
}