Boxes

/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the demonstration applications 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef SCENE_H
#define SCENE_H

//#include <GL/glew.h>
#include "glextensions.h"

#include <QtWidgets>
#include <QtOpenGL>

#include "roundedbox.h"
#include "gltrianglemesh.h"
#include "trackball.h"
#include "glbuffers.h"
#include "qtbox.h"

class QMatrix4x4;

class ParameterEdit : public QWidget
{
public:
    virtual void emitChange() = 0;
};

class ColorEdit : public ParameterEdit
{
    Q_OBJECT
public:
    ColorEdit(QRgb initialColor, int id);
    QRgb color() const {return m_color;}
    void emitChange() override { emit colorChanged(m_color, m_id); }
public slots:
    void editDone();
signals:
    void colorChanged(QRgb color, int id);
protected:
    void mousePressEvent(QMouseEvent *event) override;
    void setColor(QRgb color); // also emits colorChanged()
private:
    QGraphicsScene *m_dialogParentScene;
    QLineEdit *m_lineEdit;
    QFrame *m_button;
    QRgb m_color;
    int m_id;
};

class FloatEdit : public ParameterEdit
{
    Q_OBJECT
public:
    FloatEdit(float initialValue, int id);
    float value() const {return m_value;}
    void emitChange() override { emit valueChanged(m_value, m_id); }
public slots:
    void editDone();
signals:
    void valueChanged(float value, int id);
private:
    QGraphicsScene *m_dialogParentScene;
    QLineEdit *m_lineEdit;
    float m_value;
    int m_id;
};

class GraphicsWidget : public QGraphicsProxyWidget
{
public:
    GraphicsWidget() : QGraphicsProxyWidget(0, Qt::Window) {}
protected:
    QVariant itemChange(GraphicsItemChange change, const QVariant &value) override;
    void resizeEvent(QGraphicsSceneResizeEvent *event) override;
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
};

class TwoSidedGraphicsWidget : public QObject
{
    Q_OBJECT
public:
    TwoSidedGraphicsWidget(QGraphicsScene *scene);
    void setWidget(int index, QWidget *widget);
    QWidget *widget(int index);
public slots:
    void flip();
protected slots:
    void animateFlip();
private:
    GraphicsWidget *m_proxyWidgets[2];
    int m_current;
    int m_angle; // angle in degrees
    int m_delta;
};

class RenderOptionsDialog : public QDialog
{
    Q_OBJECT
public:
    RenderOptionsDialog();
    int addTexture(const QString &name);
    int addShader(const QString &name);
    void emitParameterChanged();
protected slots:
    void setColorParameter(QRgb color, int id);
    void setFloatParameter(float value, int id);
signals:
    void dynamicCubemapToggled(int);
    void colorParameterChanged(const QString &, QRgb);
    void floatParameterChanged(const QString &, float);
    void textureChanged(int);
    void shaderChanged(int);
    void doubleClicked();
protected:
    void mouseDoubleClickEvent(QMouseEvent *event) override;

    QVector<QByteArray> m_parameterNames;
    QComboBox *m_textureCombo;
    QComboBox *m_shaderCombo;
    QVector<ParameterEdit *> m_parameterEdits;
};

class ItemDialog : public QDialog
{
    Q_OBJECT
public:
    enum ItemType {
        QtBoxItem,
        CircleItem,
        SquareItem,
    };

    ItemDialog();
public slots:
    void triggerNewQtBox();
    void triggerNewCircleItem();
    void triggerNewSquareItem();
signals:
    void doubleClicked();
    void newItemTriggered(ItemDialog::ItemType type);
protected:
    void mouseDoubleClickEvent(QMouseEvent *event) override;
};

class Scene : public QGraphicsScene
{
    Q_OBJECT
public:
    Scene(int width, int height, int maxTextureSize);
    ~Scene();
    void drawBackground(QPainter *painter, const QRectF &rect) override;

public slots:
    void setShader(int index);
    void setTexture(int index);
    void toggleDynamicCubemap(int state);
    void setColorParameter(const QString &name, QRgb color);
    void setFloatParameter(const QString &name, float value);
    void newItem(ItemDialog::ItemType type);
protected:
    void renderBoxes(const QMatrix4x4 &view, int excludeBox = -2);
    void setStates();
    void setLights();
    void defaultStates();
    void renderCubemaps();

    void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override;
    void mouseMoveEvent(QGraphicsSceneMouseEvent *event) override;
    void wheelEvent(QGraphicsSceneWheelEvent * event) override;
private:
    void initGL();
    QPointF pixelPosToViewPos(const QPointF& p);

    QTime m_time;
    int m_lastTime;
    int m_mouseEventTime;
    int m_distExp;
    int m_frame;
    int m_maxTextureSize;

    int m_currentShader;
    int m_currentTexture;
    bool m_dynamicCubemap;
    bool m_updateAllCubemaps;

    RenderOptionsDialog *m_renderOptions;
    ItemDialog *m_itemDialog;
    QTimer *m_timer;
    GLRoundedBox *m_box;
    TrackBall m_trackBalls[3];
    QVector<GLTexture *> m_textures;
    GLTextureCube *m_environment;
    GLTexture3D *m_noise;
    GLRenderTargetCube *m_mainCubemap;
    QVector<GLRenderTargetCube *> m_cubemaps;
    QVector<QGLShaderProgram *> m_programs;
    QGLShader *m_vertexShader;
    QVector<QGLShader *> m_fragmentShaders;
    QGLShader *m_environmentShader;
    QGLShaderProgram *m_environmentProgram;
};

#endif