77d30df7e5
ES 1.0 didn't have glTexParameteri, which is why we sometimes used glTexParameterf. However, we shouldn't use glTexParameterf because that's treating integer values as floating point, which is not type safe. ES 1.1+ and ES 2.x have glTexParameteri, and we don't really care about supporting ES 1.0 in any case in Qt 5. Change-Id: I6b586b31ddc418ba319c4cc88f6bb3978fdbd040 Reviewed-by: Kim M. Kalland <kim.kalland@nokia.com>
235 lines
6.5 KiB
C++
235 lines
6.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "mainwidget.h"
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#include "geometryengine.h"
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#include <QtOpenGL/QGLShaderProgram>
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#include <QBasicTimer>
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#include <QMouseEvent>
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#include <math.h>
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#include <QDebug>
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MainWidget::MainWidget(QWidget *parent) :
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QGLWidget(parent),
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timer(new QBasicTimer),
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program(new QGLShaderProgram),
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geometries(new GeometryEngine)
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{
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}
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MainWidget::~MainWidget()
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{
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delete timer; timer = 0;
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delete program; program = 0;
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delete geometries; geometries = 0;
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deleteTexture(texture);
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}
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//! [0]
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void MainWidget::mousePressEvent(QMouseEvent *e)
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{
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// Saving mouse press position
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mousePressPosition = QVector2D(e->localPos());
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}
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void MainWidget::mouseReleaseEvent(QMouseEvent *e)
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{
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// Mouse release position - mouse press position
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QVector2D diff = QVector2D(e->localPos()) - mousePressPosition;
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// Rotation axis is perpendicular to the mouse position difference
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// vector
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QVector3D n = QVector3D(diff.y(), diff.x(), 0.0).normalized();
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// Accelerate angular speed relative to the length of the mouse sweep
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qreal acc = diff.length() / 100.0;
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// Calculate new rotation axis as weighted sum
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rotationAxis = (rotationAxis * angularSpeed + n * acc).normalized();
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// Increase angular speed
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angularSpeed += acc;
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}
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//! [0]
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//! [1]
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void MainWidget::timerEvent(QTimerEvent *e)
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{
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Q_UNUSED(e);
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// Decrease angular speed (friction)
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angularSpeed *= 0.99;
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// Stop rotation when speed goes below threshold
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if (angularSpeed < 0.01)
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angularSpeed = 0.0;
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else {
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// Update rotation
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rotation = QQuaternion::fromAxisAndAngle(rotationAxis, angularSpeed) * rotation;
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// Update scene
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updateGL();
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}
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}
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//! [1]
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void MainWidget::initializeGL()
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{
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initializeGLFunctions();
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qglClearColor(Qt::black);
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qDebug() << "Initializing shaders...";
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initShaders();
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qDebug() << "Initializing textures...";
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initTextures();
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//! [2]
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// Enable depth buffer
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glEnable(GL_DEPTH_TEST);
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// Enable back face culling
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glEnable(GL_CULL_FACE);
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//! [2]
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qDebug() << "Initializing geometries...";
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geometries->init();
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// using QBasicTimer because its faster that QTimer
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timer->start(12, this);
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}
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//! [3]
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void MainWidget::initShaders()
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{
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// Overriding system locale until shaders are compiled
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setlocale(LC_NUMERIC, "C");
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// Compiling vertex shader
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if (!program->addShaderFromSourceFile(QGLShader::Vertex, ":/vshader.glsl"))
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close();
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// Compiling fragment shader
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if (!program->addShaderFromSourceFile(QGLShader::Fragment, ":/fshader.glsl"))
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close();
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// Linking shader pipeline
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if (!program->link())
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close();
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// Binding shader pipeline for use
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if (!program->bind())
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close();
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// Restore system locale
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setlocale(LC_ALL, "");
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}
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//! [3]
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//! [4]
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void MainWidget::initTextures()
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{
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// Loading cube.png to texture unit 0
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glActiveTexture(GL_TEXTURE0);
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glEnable(GL_TEXTURE_2D);
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texture = bindTexture(QImage(":/cube.png"));
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// Set nearest filtering mode for texture minification
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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// Set bilinear filtering mode for texture magnification
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// Wrap texture coordinates by repeating
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// f.ex. texture coordinate (1.1, 1.2) is same as (0.1, 0.2)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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}
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//! [4]
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//! [5]
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void MainWidget::resizeGL(int w, int h)
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{
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// Set OpenGL viewport to cover whole widget
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glViewport(0, 0, w, h);
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// Calculate aspect ratio
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qreal aspect = (qreal)w / ((qreal)h?h:1);
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// Set near plane to 3.0, far plane to 7.0, field of view 45 degrees
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const qreal zNear = 3.0, zFar = 7.0, fov = 45.0;
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// Reset projection
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projection.setToIdentity();
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// Set perspective projection
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projection.perspective(fov, aspect, zNear, zFar);
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}
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//! [5]
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void MainWidget::paintGL()
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{
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// Clear color and depth buffer
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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//! [6]
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// Calculate model view transformation
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QMatrix4x4 matrix;
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matrix.translate(0.0, 0.0, -5.0);
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matrix.rotate(rotation);
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// Set modelview-projection matrix
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program->setUniformValue("mvp_matrix", projection * matrix);
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//! [6]
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// Using texture unit 0 which contains cube.png
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program->setUniformValue("texture", 0);
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// Draw cube geometry
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geometries->drawCubeGeometry(program);
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}
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