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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: http://www.qt-project.org/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 Nokia Corporation and its Subsidiary(-ies) 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."
** $QT_END_LICENSE$
**
****************************************************************************/
attribute highp vec4 qt_Vertex;
attribute highp vec3 qt_Normal;
attribute highp vec4 qt_MultiTexCoord0;
uniform highp mat4 qt_ModelViewProjectionMatrix;
uniform highp mat4 qt_ModelViewMatrix;
uniform highp mat3 qt_NormalMatrix;
varying highp vec4 texCoord0;
// varying values for per-pixel lighting
varying mediump vec4 lightingColor;
varying highp vec3 normal;
varying highp vec3 lightDirection;
varying highp vec3 halfVector;
varying highp vec3 vertexToLight;
// Varying values for per-vertex lighting
varying mediump vec4 litCombinedColor;
// These structs are copied from the QGLShaderProgramEffect documentation
struct qt_MaterialParameters {
mediump vec4 emission;
mediump vec4 ambient;
mediump vec4 diffuse;
mediump vec4 specular;
mediump float shininess;
};
uniform qt_MaterialParameters qt_Material;
struct qt_SingleLightParameters {
mediump vec4 position;
mediump vec3 spotDirection;
mediump float spotExponent;
mediump float spotCutoff;
mediump float spotCosCutoff;
mediump float constantAttenuation;
mediump float linearAttenuation;
mediump float quadraticAttenuation;
};
uniform qt_SingleLightParameters qt_Light;
// This is a pretty standard lighting function, adapted from QGLLitMaterial.
// The changes are mostly just renaming to improve readablity, but some
// unecessary features are removed too (e.g. support for two-sided materials)
void qLightVertex(vec4 vertex, vec3 normal)
{
// Start with the material's emissive color and the ambient scene color,
// which have been combined into the emission parameter.
vec4 color = qt_Material.emission;
vec4 scolor = qt_Material.specular;
// Viewer is at infinity.
vec3 toEye = vec3(0, 0, 1);
// Determine the angle between the normal and the light direction.
vec4 lightPosition = qt_Light.position;
vec3 lightDirection;
if (lightPosition.w == 0.0)
lightDirection = normalize(lightPosition.xyz);
else
lightDirection = normalize(lightPosition.xyz - vertex.xyz);
// Clean up negative values
float angle = max(dot(normal, lightDirection), 0.0);
// Calculate the ambient and diffuse light components.
vec4 adcomponent = qt_Material.ambient + angle * qt_Material.diffuse;
// Calculate the specular light components, in case they're needed for
// per-vertex lighting.
vec4 scomponent;
if (angle != 0.0) {
halfVector = normalize(lightDirection + toEye);
angle = max(dot(normal, halfVector), 0.0);
float srm = qt_Material.shininess;
vec4 scm = qt_Material.specular;
if (srm != 0.0)
scomponent = pow(angle, srm) * scm;
else
scomponent = scm;
} else {
scomponent = vec4(0, 0, 0, 0);
}
// Apply the spotlight angle and exponent.
if (qt_Light.spotCutoff != 180.0) {
vertexToLight = vertex.xyz - lightPosition.xyz;
float spot = max(dot(normalize(vertexToLight),
qt_Light.spotDirection), 0.0);
if (spot < qt_Light.spotCosCutoff) {
adcomponent = vec4(0, 0, 0, 0);
scomponent = vec4(0, 0, 0, 0);
} else {
spot = pow(spot, qt_Light.spotExponent);
adcomponent *= spot;
scomponent *= spot;
}
}
// Apply attenuation to the colors.
if (lightPosition.w != 0.0) {
float attenuation = qt_Light.constantAttenuation;
float k1 = qt_Light.linearAttenuation;
float k2 = qt_Light.quadraticAttenuation;
if (k1 != 0.0 || k2 != 0.0) {
float len = length(lightPosition.xyz - vertex.xyz);
attenuation += k1 * len + k2 * len * len;
}
color += adcomponent / attenuation;
scolor += scomponent / attenuation;
} else {
color += adcomponent;
scolor += scomponent;
}
// Generate the final output colors to pass to the fragment shader.
float alpha = qt_Material.diffuse.a;
// This is the combined diffuse and ambient lighting color
lightingColor = vec4(clamp(color.rgb, 0.0, 1.0), alpha);
// Specular lighting and combined color is used for per vertex lighting if
// per-pixel is too expensive or not required.
vec4 specularLightingColor = vec4(clamp(scolor.rgb, 0.0, 1.0), 0.0);
litCombinedColor = clamp(lightingColor + vec4(specularLightingColor.xyz, 0.0), 0.0, 1.0);
}
void main(void)
{
gl_Position = qt_ModelViewProjectionMatrix * qt_Vertex;
texCoord0 = qt_MultiTexCoord0;
// Calculate the vertex and normal to use for lighting calculations.
highp vec4 vertex = qt_ModelViewMatrix * qt_Vertex;
normal = normalize(qt_NormalMatrix * qt_Normal);
qLightVertex(vertex,normal);
}
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