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/****************************************************************************
**
** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the Graphics Dojo project on Trolltech Labs.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 or 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 GNU
** General Public Licensing requirements will be met:
** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
** http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
#include "model.h"
#include <QFile>
#include <QFileInfo>
#include <QTextStream>
#include <QVarLengthArray>
#ifndef QT_NO_OPENGL
#ifndef QT_OPENGL_ES_2
#include <GL/glew.h>
#endif
#include <QtOpenGL>
#endif
Model::Model(const QString &filePath)
: m_fileName(QFileInfo(filePath).fileName())
{
QFile file(filePath);
if (!file.open(QIODevice::ReadOnly))
return;
QVector3D boundsMin( 1e9, 1e9, 1e9);
QVector3D boundsMax(-1e9,-1e9,-1e9);
QTextStream in(&file);
while (!in.atEnd()) {
QString input = in.readLine();
if (input.isEmpty() || input[0] == '#')
continue;
QTextStream ts(&input);
QString id;
ts >> id;
if (id == "v") {
QVector3D p;
for (int i = 0; i < 3; ++i) {
ts >> ((float *)&p)[i];
((float *)&boundsMin)[i] = qMin(((float *)&boundsMin)[i], ((float *)&p)[i]);
((float *)&boundsMax)[i] = qMax(((float *)&boundsMax)[i], ((float *)&p)[i]);
}
m_points << p;
} else if (id == "f" || id == "fo") {
QVarLengthArray<int, 4> p;
while (!ts.atEnd()) {
QString vertex;
ts >> vertex;
const int vertexIndex = vertex.split('/').value(0).toInt();
if (vertexIndex)
p.append(vertexIndex > 0 ? vertexIndex - 1 : m_points.size() + vertexIndex);
}
for (int i = 0; i < p.size(); ++i) {
const int edgeA = p[i];
const int edgeB = p[(i + 1) % p.size()];
if (edgeA < edgeB)
m_edgeIndices << edgeA << edgeB;
}
for (int i = 0; i < 3; ++i)
m_pointIndices << p[i];
if (p.size() == 4)
for (int i = 0; i < 3; ++i)
m_pointIndices << p[(i + 2) % 4];
}
}
const QVector3D bounds = boundsMax - boundsMin;
const qreal scale = 1 / qMax(bounds.x() / 1, qMax(bounds.y(), bounds.z() / 1));
for (int i = 0; i < m_points.size(); ++i)
m_points[i] = (m_points[i] - (boundsMin + bounds * 0.5)) * scale;
m_size = bounds * scale;
m_normals.resize(m_points.size());
for (int i = 0; i < m_pointIndices.size(); i += 3) {
const QVector3D a = m_points.at(m_pointIndices.at(i));
const QVector3D b = m_points.at(m_pointIndices.at(i+1));
const QVector3D c = m_points.at(m_pointIndices.at(i+2));
const QVector3D normal = QVector3D::crossProduct(b - a, c - a).normalized();
for (int j = 0; j < 3; ++j)
m_normals[m_pointIndices.at(i + j)] += normal;
}
for (int i = 0; i < m_normals.size(); ++i)
m_normals[i] = m_normals[i].normalized();
}
QVector3D Model::size() const
{
return m_size;
}
void Model::render(bool wireframe, bool normals) const
{
#ifdef QT_NO_OPENGL
Q_UNUSED(wireframe);
Q_UNUSED(normals);
#else
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_GEQUAL);
glDepthMask(true);
#ifdef QT_OPENGL_ES_2
GLenum elementType = GL_UNSIGNED_SHORT;
#else
GLenum elementType = GL_UNSIGNED_INT;
#endif
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (float *)m_points.data());
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, (float *)m_normals.data());
if (wireframe)
glDrawElements(GL_LINES, m_edgeIndices.size(), elementType, m_edgeIndices.data());
else
glDrawElements(GL_TRIANGLES, m_pointIndices.size(), elementType, m_pointIndices.data());
if (normals) {
QVector<QVector3D> points;
QVector<QVector3D> normals;
for (int i = 0; i < m_normals.size(); ++i) {
points << m_points.at(i) << (m_points.at(i) + m_normals.at(i) * 0.02f);
normals << m_normals.at(i) << m_normals.at(i);
}
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (float *)points.data());
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, (float *)normals.data());
glDrawArrays(GL_LINES, 0, points.size());
}
glDisableVertexAttribArray(1);
glDisableVertexAttribArray(0);
glDisable(GL_DEPTH_TEST);
#endif
}
void Model::render(QPainter *painter, const QMatrix4x4 &matrix, bool normals) const
{
m_mapped.resize(m_points.size());
for (int i = 0; i < m_points.size(); ++i)
m_mapped[i] = matrix.map(m_points.at(i));
m_lines.clear();
for (int i = 0; i < m_edgeIndices.size(); i += 2) {
const QVector3D a = m_mapped.at(m_edgeIndices.at(i));
const QVector3D b = m_mapped.at(m_edgeIndices.at(i+1));
if (a.z() > 0 && b.z() > 0)
m_lines << QLineF(a.toPointF(), b.toPointF());
}
if (normals) {
for (int i = 0; i < m_normals.size(); ++i) {
const QVector3D a = m_mapped.at(i);
const QVector3D b = matrix.map(m_points.at(i) + m_normals.at(i) * 0.02f);
if (a.z() > 0 && b.z() > 0)
m_lines << QLineF(a.toPointF(), b.toPointF());
}
}
painter->setRenderHint(QPainter::Antialiasing, false);
painter->drawLines(m_lines);
}
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