/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
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** 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
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
**
****************************************************************************/

/****************************************************************************
**
** This is a simple QGLWidget displaying an openGL wireframe box
**
** The OpenGL code is mostly borrowed from Brian Pauls "spin" example
** in the Mesa distribution
**
****************************************************************************/

#include "glbox.h"
#include <QAxAggregated>
#include <QUuid>
#include <objsafe.h>

#if defined(Q_CC_MSVC)
#pragma warning(disable:4305) // init: truncation from const double to float
#endif

/*!
  Create a GLBox widget
*/

GLBox::GLBox( QWidget* parent, const char* name )
    : QGLWidget( parent )
{
    xRot = yRot = zRot = 0.0;           // default object rotation
    scale = 1.25;                       // default object scale
    object = 0;
}

/*!
  Release allocated resources
*/

GLBox::~GLBox()
{
    makeCurrent();

    if (object)
        glDeleteLists( object, 1 );
}

/*!
  Paint the box. The actual openGL commands for drawing the box are
  performed here.
*/

void GLBox::paintGL()
{
    glClear( GL_COLOR_BUFFER_BIT );

    glLoadIdentity();
    glTranslatef( 0.0, 0.0, -10.0 );
    glScalef( scale, scale, scale );

    glRotatef( xRot, 1.0, 0.0, 0.0 );
    glRotatef( yRot, 0.0, 1.0, 0.0 );
    glRotatef( zRot, 0.0, 0.0, 1.0 );

    glCallList( object );
}

/*!
  Set up the OpenGL rendering state, and define display list
*/

void GLBox::initializeGL()
{
    initializeOpenGLFunctions();

    qglClearColor(Qt::black);           // Let OpenGL clear to black
    object = makeObject();              // Generate an OpenGL display list
    glShadeModel( GL_FLAT );
}

/*!
  Set up the OpenGL view port, matrix mode, etc.
*/

void GLBox::resizeGL( int w, int h )
{
    glViewport( 0, 0, (GLint)w, (GLint)h );
    glMatrixMode( GL_PROJECTION );
    glLoadIdentity();
    glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
    glMatrixMode( GL_MODELVIEW );
}

/*!
  Generate an OpenGL display list for the object to be shown, i.e. the box
*/

GLuint GLBox::makeObject()
{
    GLuint list;

    list = glGenLists( 1 );

    glNewList( list, GL_COMPILE );

    qglColor(Qt::white);                      // Shorthand for glColor3f or glIndex

    glLineWidth( 2.0 );

    glBegin( GL_LINE_LOOP );
    glVertex3f(  1.0,  0.5, -0.4 );
    glVertex3f(  1.0, -0.5, -0.4 );
    glVertex3f( -1.0, -0.5, -0.4 );
    glVertex3f( -1.0,  0.5, -0.4 );
    glEnd();

    glBegin( GL_LINE_LOOP );
    glVertex3f(  1.0,  0.5, 0.4 );
    glVertex3f(  1.0, -0.5, 0.4 );
    glVertex3f( -1.0, -0.5, 0.4 );
    glVertex3f( -1.0,  0.5, 0.4 );
    glEnd();

    glBegin( GL_LINES );
    glVertex3f(  1.0,  0.5, -0.4 );   glVertex3f(  1.0,  0.5, 0.4 );
    glVertex3f(  1.0, -0.5, -0.4 );   glVertex3f(  1.0, -0.5, 0.4 );
    glVertex3f( -1.0, -0.5, -0.4 );   glVertex3f( -1.0, -0.5, 0.4 );
    glVertex3f( -1.0,  0.5, -0.4 );   glVertex3f( -1.0,  0.5, 0.4 );
    glEnd();

    glEndList();

    return list;
}

/*!
  Set the rotation angle of the object to \e degrees around the X axis.
*/

void GLBox::setXRotation( int degrees )
{
    xRot = (GLfloat)(degrees % 360);
    updateGL();
}

/*!
  Set the rotation angle of the object to \e degrees around the Y axis.
*/

void GLBox::setYRotation( int degrees )
{
    yRot = (GLfloat)(degrees % 360);
    updateGL();
}

/*!
  Set the rotation angle of the object to \e degrees around the Z axis.
*/

void GLBox::setZRotation( int degrees )
{
    zRot = (GLfloat)(degrees % 360);
    updateGL();
}

class ObjectSafetyImpl : public QAxAggregated,
                         public IObjectSafety
{
public:
    ObjectSafetyImpl() {}

    long queryInterface( const QUuid &iid, void **iface )
    {
        *iface = 0;
        if ( iid == IID_IObjectSafety )
            *iface = (IObjectSafety*)this;
        else
            return E_NOINTERFACE;

        AddRef();
        return S_OK;
    }

    QAXAGG_IUNKNOWN;

    HRESULT WINAPI GetInterfaceSafetyOptions( REFIID riid, DWORD *pdwSupportedOptions, DWORD *pdwEnabledOptions )
    {
        *pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA | INTERFACESAFE_FOR_UNTRUSTED_CALLER;
        *pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA | INTERFACESAFE_FOR_UNTRUSTED_CALLER;
        return S_OK;
    }
    HRESULT WINAPI SetInterfaceSafetyOptions( REFIID riid, DWORD pdwSupportedOptions, DWORD pdwEnabledOptions )
    {
        return S_OK;
    }
};

QAxAggregated *GLBox::createAggregate()
{
    return new ObjectSafetyImpl();
}