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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.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef PAGEFLIPMATH_P_H
#define PAGEFLIPMATH_P_H
#include <QtOpenGL/qgl.h>
QT_BEGIN_NAMESPACE
class PageFlipMath
{
public:
PageFlipMath();
~PageFlipMath();
enum StartCorner
{
BottomRight,
TopRight,
BottomLeft,
TopLeft,
BottomLeftOnePage,
TopLeftOnePage,
VerticalBottomRight,
VerticalTopRight,
VerticalBottomLeft,
VerticalTopLeft
};
// Corner to start flipping from.
StartCorner startCorner() const { return m_startCorner; }
void setStartCorner(StartCorner value) { m_startCorner = value; }
// Rectangle to display the main page (usually the one on the right).
QRect pageRect() const { return m_pageRect; }
void setPageRect(const QRect& rect) { m_pageRect = rect; }
// Show the reverse of the right-hand page on the back when
// flipping pages. That is, the user will essentially see
// the texture on the front of the page "through" it in reverse
// while it is being flipped.
bool showPageReverse() const { return m_showPageReverse; }
void setShowPageReverse(bool value) { m_showPageReverse = value; }
// Get the vertex array pointer.
const GLfloat *vertexArray() const { return vertices[0][0]; }
// Get the vertex array stride in bytes.
int stride() const { return 5 * sizeof(GLfloat); }
// Draw a specific page.
void drawPage(int page) const;
// Draw the outline of a page as a set of lines.
void drawOutline(int page) const;
// Compute the frame at position t (0...1) in the animation.
void compute(qreal t);
private:
StartCorner m_startCorner;
QRect m_pageRect;
bool m_showPageReverse;
// Vertex array: up to 4 pages, with up to 5 vertices per page,
// and 5 components (2D position, 2D texcoord, 1D gradient control)
// per vertex. The gradient control value is interpolated between
// 0 and 1 - it is 1 at the fold point and 0 on the side of the page
// opposite the fold point. Shaders can use this to extract a color
// value from a gradient texture to blend with the page texture.
GLfloat vertices[4][5][5];
// Number of vertices for drawing the triangle fan for each page.
int pageCount[4];
void flip(qreal pageWidth, qreal pageHeight, qreal t);
};
QT_END_NAMESPACE
#endif
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