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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."
**
** $QT_END_LICENSE$
**
****************************************************************************/
uniform highp mat4 viewMatrix;
uniform highp vec3 lightPosition;
uniform highp vec3 lightIntensity;
uniform highp vec3 ka; // Ambient reflectivity
uniform highp float shininess; // Specular shininess factor
uniform highp float opacity; // Alpha channel
uniform sampler2D diffuseTexture;
uniform sampler2D specularTexture;
varying highp vec4 positionInLightSpace;
varying highp vec3 position;
varying highp vec3 normal;
varying highp vec2 texCoord;
highp vec3 dsModel(const highp vec2 flipYTexCoord)
{
// Calculate the vector from the light to the fragment
highp vec3 s = normalize(vec3(viewMatrix * vec4(lightPosition, 1.0)) - position);
// Calculate the vector from the fragment to the eye position
// (origin since this is in "eye" or "camera" space)
highp vec3 v = normalize(-position);
// Reflect the light beam using the normal at this fragment
highp vec3 r = reflect(-s, normal);
// Calculate the diffuse component
highp float diffuse = max(dot(s, normal), 0.0);
// Calculate the specular component
highp float specular = 0.0;
if (dot(s, normal) > 0.0)
specular = (shininess / (8.0 * 3.14)) * pow(max(dot(r, v), 0.0), shininess);
// Lookup diffuse and specular factors
highp vec3 diffuseColor = texture2D(diffuseTexture, flipYTexCoord).rgb;
highp vec3 specularColor = texture2D(specularTexture, flipYTexCoord).rgb;
// Combine the ambient, diffuse and specular contributions
return lightIntensity * ((ka + diffuse) * diffuseColor + specular * specularColor);
}
void main()
{
highp vec2 flipYTexCoord = texCoord;
flipYTexCoord.y = 1.0 - texCoord.y;
highp vec3 result = dsModel(flipYTexCoord);
highp float alpha = opacity * texture2D(diffuseTexture, flipYTexCoord).a;
gl_FragColor = vec4(result, alpha);
}
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