glarea.cpp

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/****************************************************************************
* VCGLib                                                            o o     *
* Visual and Computer Graphics Library                            o     o   *
*                                                                _   O  _   *
* Copyright(C) 2007                                                \/)\/    *
* Visual Computing Lab                                            /\/|      *
* ISTI - Italian National Research Council                           |      *
*                                                                    \      *
* All rights reserved.                                                      *
*                                                                           *
* This program is free software; you can redistribute it and/or modify      *
* it under the terms of the GNU General Public License as published by      *
* the Free Software Foundation; either version 2 of the License, or         *
* (at your option) any later version.                                       *
*                                                                           *
* This program is distributed in the hope that it will be useful,           *
* but WITHOUT ANY WARRANTY; without even the implied warranty of            *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
* GNU General Public License (http://www.gnu.org/licenses/gpl.txt)          *
* for more details.                                                         *
*                                                                           *
****************************************************************************/
/****************************************************************************
History

$Log: not supported by cvs2svn $
Revision 1.1  2007/10/18 08:52:06  benedetti
Initial release.


****************************************************************************/


#include "glarea.h"
#include <QKeyEvent>
#include <QKeyEvent>
#include <QWheelEvent>
#include <wrap/qt/trackball.h>
#include <cassert>

#ifdef Q_OS_MAC
#define glGenVertexArrays glGenVertexArraysAPPLE
#define glBindVertexArray glBindVertexArrayAPPLE
#define glDeleteVertexArrays glDeleteVertexArraysAPPLE
#endif

GLArea::GLArea (CMeshO& m, MLThreadSafeGLMeshAttributesFeeder& feed,QWidget* parent,QGLWidget* sharedcont)
    :QGLWidget (parent,sharedcont),mesh(m),feeder(feed),rq(),drawmode(MDM_SMOOTH)
{
}

GLArea::~GLArea()
{
}

void GLArea::initializeGL()
{
        makeCurrent();
        glewExperimental=GL_TRUE;
        glewInit();
        glClearColor(0, 0, 0, 0);
        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
        glEnable(GL_NORMALIZE);
        glEnable(GL_COLOR_MATERIAL);
        glEnable(GL_CULL_FACE);
        glEnable(GL_DEPTH_TEST);
}

void GLArea::resizeGL (int w, int h)
{
        makeCurrent();
        glViewport (0, 0, (GLsizei) w, (GLsizei) h);
    //initializeGL();
}

void GLArea::paintGL ()
{
        makeCurrent();
        glPushAttrib(GL_ALL_ATTRIB_BITS);
    //GLenum err = glGetError();
    //assert(err == GL_NO_ERROR);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        gluPerspective(25, GLArea::width()/(float)GLArea::height(), 0.1, 100);
        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
        glLoadIdentity();
        gluLookAt(0,0,5,   0,0,0,   0,1,0);
        track.center=vcg::Point3f(0, 0, 0);
        track.radius= 1;
        track.GetView();
        track.Apply();
        glPushMatrix();
        float d=2.0f/mesh.bbox.Diag();
        vcg::glScale(d);
        glTranslate(-mesh.bbox.Center());

        if (mesh.VN() > 0)
        {
                switch(drawmode)
                {
                case MDM_SMOOTH:
                case MDM_FLAT:
                        feeder.drawTriangles(rq);
                case MDM_WIRE:
                        feeder.drawWire(rq);
                        break;
                case MDM_POINTS:
                        feeder.drawPoints(rq);
                        break;
                case MDM_FLATWIRE:
                        feeder.drawFlatWire(rq);
                        break;
                default:
                        break;
                }
        }
        glPopMatrix();
        
        track.DrawPostApply();
        glPopMatrix();
        glMatrixMode(GL_PROJECTION);
        glPopMatrix();
        glPopAttrib();
        //doneCurrent();
        GLenum err = glGetError();
        assert(err == GL_NO_ERROR);
}

void GLArea::keyReleaseEvent (QKeyEvent * e)
{
        e->ignore ();
        if (e->key () == Qt::Key_Control)
                track.ButtonUp (QT2VCG (Qt::NoButton, Qt::ControlModifier));
        if (e->key () == Qt::Key_Shift)
                track.ButtonUp (QT2VCG (Qt::NoButton, Qt::ShiftModifier));
        if (e->key () == Qt::Key_Alt)
                track.ButtonUp (QT2VCG (Qt::NoButton, Qt::AltModifier));
        updateGL ();
}

void GLArea::keyPressEvent (QKeyEvent * e)
{
        e->ignore ();
        if (e->key () == Qt::Key_Control)
                track.ButtonDown (QT2VCG (Qt::NoButton, Qt::ControlModifier));
        if (e->key () == Qt::Key_Shift)
                track.ButtonDown (QT2VCG (Qt::NoButton, Qt::ShiftModifier));
        if (e->key () == Qt::Key_Alt)
                track.ButtonDown (QT2VCG (Qt::NoButton, Qt::AltModifier));
        updateGL ();
}

void GLArea::mousePressEvent (QMouseEvent * e)
{
        e->accept ();
        setFocus ();
        track.MouseDown (QT2VCG_X(this,e), QT2VCG_Y(this,e), QT2VCG (e->button (), e->modifiers ()));
        updateGL ();
}

void GLArea::mouseMoveEvent (QMouseEvent * e)
{
        if (e->buttons ()) {
                track.MouseMove (QT2VCG_X(this,e), QT2VCG_Y(this,e));
                updateGL ();
        }
}

void GLArea::mouseReleaseEvent (QMouseEvent * e)
{
        track.MouseUp (QT2VCG_X(this,e), QT2VCG_Y(this,e), QT2VCG (e->button (), e->modifiers ()));
        updateGL ();
}

void GLArea::wheelEvent (QWheelEvent * e)
{
        const int WHEEL_STEP = 120;
        track.MouseWheel (e->delta () / float (WHEEL_STEP), QTWheel2VCG (e->modifiers ()));
        updateGL ();
}

void GLArea::updateRequested(MyDrawMode md,vcg::GLFeederInfo::ReqAtts& reqatts)
{
        drawmode = md;
        rq = reqatts;
        updateGL();
}

void GLArea::resetTrackBall()
{
    makeCurrent();
        track.Reset();
        updateGL();
    doneCurrent();
}



SharedDataOpenGLContext::SharedDataOpenGLContext( CMeshO& mesh,MLThreadSafeMemoryInfo& mi,QWidget* parent /*= 0*/ )
        :QGLWidget(parent),feeder(mesh,mi,100000)
{
}

SharedDataOpenGLContext::~SharedDataOpenGLContext()
{
        deAllocateBO();
}

void SharedDataOpenGLContext::myInitGL()
{
    makeCurrent();
    glewInit();
        doneCurrent();
}

void SharedDataOpenGLContext::passInfoToOpenGL(int mode)
{
        makeCurrent();
        MyDrawMode drawmode = static_cast<MyDrawMode>(mode);
    //_tsbm.setUpBuffers();
        vcg::GLFeederInfo::ReqAtts req;
        bool allocated = false;
        switch(drawmode)
        {
        case MDM_SMOOTH:
        case MDM_WIRE:
                req[vcg::GLFeederInfo::ATT_VERTPOSITION] = true;
                req[vcg::GLFeederInfo::ATT_VERTNORMAL] = true;
                req[vcg::GLFeederInfo::ATT_VERTINDEX] = true;
                req.primitiveModality() = vcg::GLFeederInfo::PR_TRIANGLES;
                break;
        case MDM_POINTS:
                req[vcg::GLFeederInfo::ATT_VERTPOSITION] = true;
                req[vcg::GLFeederInfo::ATT_VERTNORMAL] = true;
                req.primitiveModality() = vcg::GLFeederInfo::PR_POINTS;
                break;
        case MDM_FLAT:
        case MDM_FLATWIRE:
                req[vcg::GLFeederInfo::ATT_VERTPOSITION] = true;
                req[vcg::GLFeederInfo::ATT_FACENORMAL] = true;
                req.primitiveModality() = vcg::GLFeederInfo::PR_TRIANGLES;
                break;
        default:
                break;
        }
        vcg::GLFeederInfo::ReqAtts rq = feeder.setupRequestedAttributes(req,allocated);
        doneCurrent();
        emit dataReadyToBeRead(drawmode,rq);

}

void SharedDataOpenGLContext::deAllocateBO()
{
        makeCurrent();
        feeder.deAllocateBO();
        doneCurrent();
}