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/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#version 150 core
uniform mat4 viewMatrix;
uniform vec3 lightPosition;
uniform vec3 lightIntensity;
uniform vec3 ka; // Ambient reflectivity
uniform float shininess; // Specular shininess factor
uniform float opacity; // Alpha channel
uniform sampler2D diffuseTexture;
uniform sampler2D specularTexture;
uniform sampler2D normalTexture;
in vec3 lightDir;
in vec3 viewDir;
in vec2 texCoord;
out vec4 fragColor;
void dsbModel(const in vec3 norm, const in vec2 flipYTexCoord, out vec3 ambientAndDiff, out vec3 spec)
{
// Reflection of light direction about normal
vec3 r = reflect(-lightDir, norm);
vec3 diffuseColor = texture(diffuseTexture, flipYTexCoord).rgb;
vec3 specularColor = texture(specularTexture, flipYTexCoord).rgb;
// Calculate the ambient contribution
vec3 ambient = lightIntensity * ka * diffuseColor;
// Calculate the diffuse contribution
float sDotN = max(dot(lightDir, norm), 0.0);
vec3 diffuse = lightIntensity * diffuseColor * sDotN;
// Sum the ambient and diffuse contributions
ambientAndDiff = ambient + diffuse;
// Calculate the specular highlight contribution
spec = vec3(0.0);
if (sDotN > 0.0)
spec = (lightIntensity * (shininess / (8.0 * 3.14))) * pow(max(dot(r, viewDir), 0.0), shininess);
spec *= specularColor;
}
void main()
{
vec2 flipYTexCoord = texCoord;
flipYTexCoord.y = 1.0 - texCoord.y;
// Sample the textures at the interpolated texCoords
vec4 normal = 2.0 * texture(normalTexture, flipYTexCoord) - vec4(1.0);
// Calculate the lighting model, keeping the specular component separate
vec3 ambientAndDiff, spec;
dsbModel(normalize(normal.xyz), flipYTexCoord, ambientAndDiff, spec);
vec3 result = ambientAndDiff + spec;
// Combine spec with ambient+diffuse for final fragment color
fragColor = vec4(result, opacity);
}
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