161 lines
3.5 KiB
C++
161 lines
3.5 KiB
C++
#include "..\Header\OglViewerWidget.h"
|
|
|
|
#include <QMouseEvent>
|
|
#include <math.h>
|
|
#include <iostream>
|
|
|
|
OglViewerWidget::OglViewerWidget(QWidget *parent) :
|
|
QOpenGLWidget(parent),
|
|
geometries(0),
|
|
texture(0)
|
|
{
|
|
setFocus();
|
|
}
|
|
|
|
OglViewerWidget::~OglViewerWidget()
|
|
{
|
|
// Make sure the context is current when deleting the texture
|
|
// and the buffers.
|
|
makeCurrent();
|
|
delete texture;
|
|
delete geometries;
|
|
doneCurrent();
|
|
}
|
|
|
|
void OglViewerWidget::mousePressEvent(QMouseEvent *e)
|
|
{
|
|
// Save mouse press position
|
|
m_mouse.position = QVector2D(e->localPos());
|
|
|
|
// Which button has been pressed?
|
|
if (e->button() == Qt::LeftButton)
|
|
m_mouse.left = true;
|
|
else if (e->button() == Qt::RightButton)
|
|
m_mouse.right = true;
|
|
}
|
|
|
|
void OglViewerWidget::mouseReleaseEvent(QMouseEvent *e)
|
|
{
|
|
if (e->button() == Qt::LeftButton)
|
|
m_mouse.left = false;
|
|
else if (e->button() == Qt::RightButton)
|
|
m_mouse.right = false;
|
|
}
|
|
|
|
void OglViewerWidget::mouseMoveEvent(QMouseEvent *e)
|
|
{
|
|
if (m_mouse.left)
|
|
{
|
|
// get the difference between last press and now
|
|
QVector2D diff = QVector2D(e->localPos()) - m_mouse.position;
|
|
|
|
// update the new position
|
|
m_mouse.position = QVector2D(e->localPos());
|
|
|
|
// calculate the rotation axis and rotate
|
|
m_rotation = QQuaternion::fromAxisAndAngle(QVector3D(diff.y(), diff.x(), 0.0).normalized(), diff.length() * 0.5) * m_rotation;
|
|
|
|
// request an update
|
|
update();
|
|
}
|
|
}
|
|
|
|
void OglViewerWidget::keyPressEvent(QKeyEvent *e)
|
|
{
|
|
if (e->key() == Qt::Key_Space)
|
|
m_rotation = QQuaternion();
|
|
|
|
update();
|
|
}
|
|
|
|
void OglViewerWidget::initializeGL()
|
|
{
|
|
initializeOpenGLFunctions();
|
|
|
|
glClearColor(0, 0, 0, 1);
|
|
|
|
initShaders();
|
|
initTextures();
|
|
|
|
// Enable depth buffer
|
|
glEnable(GL_DEPTH_TEST);
|
|
|
|
// Enable back face culling
|
|
glEnable(GL_CULL_FACE);
|
|
|
|
geometries = new GeometryEngine;
|
|
|
|
}
|
|
|
|
void OglViewerWidget::initShaders()
|
|
{
|
|
// Compile vertex shader
|
|
if (!program.addShaderFromSourceFile(QOpenGLShader::Vertex, ":/shaders/vshader.glsl"))
|
|
close();
|
|
|
|
// Compile fragment shader
|
|
if (!program.addShaderFromSourceFile(QOpenGLShader::Fragment, ":/shaders/fshader.glsl"))
|
|
close();
|
|
|
|
// Link shader pipeline
|
|
if (!program.link())
|
|
close();
|
|
|
|
// Bind shader pipeline for use
|
|
if (!program.bind())
|
|
close();
|
|
}
|
|
|
|
void OglViewerWidget::initTextures()
|
|
{
|
|
// Load cube.png image
|
|
texture = new QOpenGLTexture(QImage(":images/cube.png").mirrored());
|
|
|
|
// Set nearest filtering mode for texture minification
|
|
texture->setMinificationFilter(QOpenGLTexture::Nearest);
|
|
|
|
// Set bilinear filtering mode for texture magnification
|
|
texture->setMagnificationFilter(QOpenGLTexture::Linear);
|
|
|
|
// Wrap texture coordinates by repeating
|
|
// f.ex. texture coordinate (1.1, 1.2) is same as (0.1, 0.2)
|
|
texture->setWrapMode(QOpenGLTexture::Repeat);
|
|
}
|
|
|
|
void OglViewerWidget::resizeGL(int w, int h)
|
|
{
|
|
// Calculate aspect ratio
|
|
qreal aspect = qreal(w) / qreal(h ? h : 1);
|
|
|
|
// Set near plane to 3.0, far plane to 7.0, field of view 45 degrees
|
|
const qreal zNear = 3.0, zFar = 7.0, fov = 45.0;
|
|
|
|
// Reset projection
|
|
m_projection.setToIdentity();
|
|
|
|
// Set perspective projection
|
|
m_projection.perspective(fov, aspect, zNear, zFar);
|
|
}
|
|
|
|
void OglViewerWidget::paintGL()
|
|
{
|
|
// Clear color and depth buffer
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
|
|
texture->bind();
|
|
|
|
// Calculate model view transformation
|
|
QMatrix4x4 matrix;
|
|
matrix.translate(0.0, 0.0, -5.0);
|
|
matrix.rotate(m_rotation);
|
|
|
|
// Set modelview-projection matrix
|
|
program.setUniformValue("mvp_matrix", m_projection * matrix);
|
|
|
|
// Use texture unit 0 which contains cube.png
|
|
program.setUniformValue("texture", 0);
|
|
|
|
// Draw cube geometry
|
|
geometries->drawCubeGeometry(&program);
|
|
}
|