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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtQuick3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QFile>
#include "projectivetextureeffect.h"
#include <QtOpenGL/qglshaderprogram.h>
static const QMatrix4x4 biasMatrix = QMatrix4x4(0.5, 0.0, 0.0, 0.5,
0.0, 0.5, 0.0, 0.5,
0.0, 0.0, 0.5, 0.5,
0.0, 0.0, 0.0, 1.0);
/*!
The ProjectiveTextureEffect mimics the effect of shining a projector onto
a scene from a specific direction. Vertex coordinates in object space are
transformed into eye-space coordinates relative to the light direction,
using the objectLinearTexgenMatrix.
*/
ProjectiveTextureEffect::ProjectiveTextureEffect() :
matrixDirty(true)
{
setupShaders();
}
void ProjectiveTextureEffect::setActive(QGLPainter *painter, bool flag)
{
QGLShaderProgramEffect::setActive(painter, flag);
}
void ProjectiveTextureEffect::update(QGLPainter *painter, QGLPainter::Updates updates)
{
QGLShaderProgramEffect::update(painter, updates);
if (matrixDirty)
{
recalulateObjectLinearTexgenMatrix();
matrixDirty = false;
}
program()->setUniformValue("objectLinearTexgenMatrix",
objectLinearTexgenMatrix);
program()->setUniformValue("projectorDirection",
projectorDirection);
}
void ProjectiveTextureEffect::setProjectorDirection(const QVector4D &direction)
{
this->projectorDirection = direction;
matrixDirty = true;
}
void ProjectiveTextureEffect::setCameraModelViewMatrix(const QMatrix4x4 &newCameraModelViewMatrix)
{
cameraModelViewMatrix = newCameraModelViewMatrix;
bool invertible;
inverseCameraModelViewMatrix =
newCameraModelViewMatrix.inverted(&invertible);
Q_ASSERT(invertible);
if (!invertible)
qWarning() << "camera Model view matrix not invertible in ProjectiveDepthTestEffect::setCameraModelViewMatrix()";
matrixDirty = true;
}
void ProjectiveTextureEffect::setProjectorProjectionMatrix(const QMatrix4x4 &newMatrix)
{
projectorProjectionMatrix = newMatrix;
matrixDirty = true;
}
void ProjectiveTextureEffect::setProjectorViewMatrix(const QMatrix4x4 &newMatrix)
{
projectorViewMatrix = newMatrix;
matrixDirty = true;
}
void ProjectiveTextureEffect::setModelMatrix(const QMatrix4x4 &newMatrix)
{
modelMatrix = newMatrix;
matrixDirty = true;
}
void ProjectiveTextureEffect::recalulateObjectLinearTexgenMatrix()
{
objectLinearTexgenMatrix = biasMatrix *
projectorProjectionMatrix *
projectorViewMatrix *
modelMatrix;
}
void ProjectiveTextureEffect::setupShaders()
{
QString vertexShaderFileName = QLatin1String(":/shaders/objectlineartexgen.vert");
QFile vertexShaderFile(vertexShaderFileName);
if (vertexShaderFile.open(QIODevice::ReadOnly | QIODevice::Text))
{
setVertexShader(vertexShaderFile.readAll());
} else {
qWarning() << "Could not open file "<<vertexShaderFileName<<", failed to load vertex shader";
}
QString fragmentShaderFileName = QLatin1String(":/shaders/objectlineartexgen.frag");
QFile fragmentShaderFile(fragmentShaderFileName);
if (fragmentShaderFile.open(QIODevice::ReadOnly | QIODevice::Text))
{
setFragmentShader(fragmentShaderFile.readAll());
} else {
qWarning() << "Could not open file "<<fragmentShaderFileName<<", failed to load fragment shader";
}
}
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