48 lines
1.6 KiB
GLSL
48 lines
1.6 KiB
GLSL
/*
|
|
* Copyright (c) 2019-2021, NVIDIA CORPORATION. All rights reserved.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* SPDX-FileCopyrightText: Copyright (c) 2019-2021 NVIDIA CORPORATION
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#include "host_device.h"
|
|
|
|
vec3 computeDiffuse(WaveFrontMaterial mat, vec3 lightDir, vec3 normal)
|
|
{
|
|
// Lambertian
|
|
float dotNL = max(dot(normal, lightDir), 0.0);
|
|
vec3 c = mat.diffuse * dotNL;
|
|
if(mat.illum >= 1)
|
|
c += mat.ambient;
|
|
return c;
|
|
}
|
|
|
|
vec3 computeSpecular(WaveFrontMaterial mat, vec3 viewDir, vec3 lightDir, vec3 normal)
|
|
{
|
|
if(mat.illum < 2)
|
|
return vec3(0);
|
|
|
|
// Compute specular only if not in shadow
|
|
const float kPi = 3.14159265;
|
|
const float kShininess = max(mat.shininess, 4.0);
|
|
|
|
// Specular
|
|
const float kEnergyConservation = (2.0 + kShininess) / (2.0 * kPi);
|
|
vec3 V = normalize(-viewDir);
|
|
vec3 R = reflect(-lightDir, normal);
|
|
float specular = kEnergyConservation * pow(max(dot(V, R), 0.0), kShininess);
|
|
|
|
return vec3(mat.specular * specular);
|
|
}
|