151 lines
3.3 KiB
C++
151 lines
3.3 KiB
C++
#include "..\Header\OglViewerWidget.h"
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#include <QMouseEvent>
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#include <math.h>
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/////////////////////////////////////////////////////////////////////////
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// public constructor/destructor
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OglViewerWidget::OglViewerWidget(QWidget *parent) :
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QOpenGLWidget(parent),
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m_dataEngine(0)
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{
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setFocus();
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}
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OglViewerWidget::~OglViewerWidget()
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{
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// Make sure the context is current when deleting the texture
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// and the buffers.
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makeCurrent();
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delete m_dataEngine;
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doneCurrent();
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}
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/////////////////////////////////////////////////////////////////////////
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// protected functions
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void OglViewerWidget::mousePressEvent(QMouseEvent *e)
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{
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// Save mouse press position
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m_mouse.position = QVector2D(e->localPos());
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// Which button has been pressed?
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if (e->button() == Qt::LeftButton)
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m_mouse.left = true;
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else if (e->button() == Qt::RightButton)
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m_mouse.right = true;
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}
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void OglViewerWidget::mouseReleaseEvent(QMouseEvent *e)
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{
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if (e->button() == Qt::LeftButton)
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m_mouse.left = false;
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else if (e->button() == Qt::RightButton)
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m_mouse.right = false;
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}
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void OglViewerWidget::mouseMoveEvent(QMouseEvent *e)
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{
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if (m_mouse.left)
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{
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// get the difference between last press and now
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QVector2D diff = QVector2D(e->localPos()) - m_mouse.position;
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// update the new position
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m_mouse.position = QVector2D(e->localPos());
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// calculate the rotation axis and rotate
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m_rotation = QQuaternion::fromAxisAndAngle(QVector3D(diff.y(), diff.x(), 0.0).normalized(), diff.length() * 0.5) * m_rotation;
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// request an update
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update();
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}
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}
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void OglViewerWidget::keyPressEvent(QKeyEvent *e)
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{
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if (e->key() == Qt::Key_Space)
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m_rotation = QQuaternion();
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update();
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}
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void OglViewerWidget::initializeGL()
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{
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initializeOpenGLFunctions();
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glClearColor(0, 0, 0, 1);
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initShaders();
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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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m_dataEngine = new GeometryEngine;
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}
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void OglViewerWidget::resizeGL(int w, int h)
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{
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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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m_projection.setToIdentity();
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// Set perspective projection
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m_projection.perspective(fov, aspect, zNear, zFar);
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}
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void OglViewerWidget::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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// Calculate model view transformation
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QMatrix4x4 view;
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view.translate(0.0, 0.0, -5.0);
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view.rotate(m_rotation);
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// Set modelview-projection matrix
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m_program.setUniformValue("mvp_matrix", m_projection * view);
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// Draw cube geometry
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m_dataEngine->drawGeometry(&m_program);
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}
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/////////////////////////////////////////////////////////////////////////
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// private functions
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void OglViewerWidget::initShaders()
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{
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// Compile vertex shader
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if (!m_program.addShaderFromSourceFile(QOpenGLShader::Vertex, ":/shaders/vshader.glsl"))
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close();
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// Compile fragment shader
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if (!m_program.addShaderFromSourceFile(QOpenGLShader::Fragment, ":/shaders/fshader.glsl"))
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close();
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// Link shader pipeline
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if (!m_program.link())
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close();
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// Bind shader pipeline for use
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if (!m_program.bind())
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close();
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}
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/////////////////////////////////////////////////////////////////////////
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// public functions
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