comparison: src/gl/partrenderer.cpp
src/gl/partrenderer.cpp
- changeset 17
- a5111f4e6412
- child 18
- 918b6c0f8b5b
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| 16:aeb5f203b3eb | 17:a5111f4e6412 |
|---|---|
| 1 #include <QMouseEvent> | |
| 2 #include <GL/glut.h> // teapot | |
| 3 #include "partrenderer.h" | |
| 4 | |
| 5 PartRenderer::PartRenderer(QWidget* parent) : | |
| 6 QOpenGLWidget{parent} | |
| 7 { | |
| 8 this->setMouseTracking(true); | |
| 9 } | |
| 10 | |
| 11 void PartRenderer::initializeGL() | |
| 12 { | |
| 13 this->initializeOpenGLFunctions(); | |
| 14 if (this->glGetError() != GL_NO_ERROR) | |
| 15 { | |
| 16 abort(); | |
| 17 } | |
| 18 this->initializeLighting(); | |
| 19 this->initialized = true; | |
| 20 this->rotation = QQuaternion::fromAxisAndAngle({1, 0, 0}, 30); | |
| 21 this->rotation *= QQuaternion::fromAxisAndAngle({0, 1, 0}, 330); | |
| 22 } | |
| 23 | |
| 24 // https://stackoverflow.com/a/12943456 | |
| 25 static void perspectiveGL(GLdouble fovY, GLdouble aspect, GLdouble zNear, GLdouble zFar) | |
| 26 { | |
| 27 //fH = tan( (fovY / 2) / 180 * pi ) * zNear; | |
| 28 const GLdouble fH = std::tan(fovY / 360 * pi) * zNear; | |
| 29 const GLdouble fW = fH * aspect; | |
| 30 glFrustum(-fW, fW, -fH, fH, zNear, zFar); | |
| 31 } | |
| 32 | |
| 33 /* | |
| 34 * Pads a 3×3 matrix into a 4×4 one by adding cells from the identity matrix. | |
| 35 */ | |
| 36 static QMatrix4x4 padMatrix(const QMatrix3x3& stub) | |
| 37 { | |
| 38 return { | |
| 39 stub(0, 0), stub(0, 1), stub(0, 2), 0, | |
| 40 stub(1, 0), stub(1, 1), stub(1, 2), 0, | |
| 41 stub(2, 0), stub(2, 1), stub(2, 2), 0, | |
| 42 0, 0, 0, 1 | |
| 43 }; | |
| 44 } | |
| 45 | |
| 46 | |
| 47 void PartRenderer::initializeLighting() | |
| 48 { | |
| 49 GLfloat materialShininess[] = {5.0}; | |
| 50 GLfloat lightPosition[] = {1.0, 1.0, 1.0, 0.0}; | |
| 51 GLfloat ambientLightingLevel[] = {0.5, 0.5, 0.5, 1.0}; | |
| 52 glShadeModel(GL_SMOOTH); | |
| 53 glMaterialfv(GL_FRONT, GL_SHININESS, materialShininess); | |
| 54 glLightfv(GL_LIGHT0, GL_AMBIENT, ambientLightingLevel); | |
| 55 glLightfv(GL_LIGHT0, GL_DIFFUSE, ambientLightingLevel); | |
| 56 glLightfv(GL_LIGHT0, GL_POSITION, lightPosition); | |
| 57 glEnable(GL_LIGHTING); | |
| 58 glEnable(GL_LIGHT0); | |
| 59 glEnable(GL_COLOR_MATERIAL); | |
| 60 glEnable(GL_DEPTH_TEST); | |
| 61 } | |
| 62 | |
| 63 void PartRenderer::resizeGL(int width, int height) | |
| 64 { | |
| 65 constexpr GLfloat near = 1.0f; | |
| 66 constexpr GLfloat far = 1.0e+05f; | |
| 67 glViewport (0, 0, width, height); | |
| 68 glMatrixMode(GL_PROJECTION); | |
| 69 glLoadIdentity(); | |
| 70 ::perspectiveGL(45.0f, static_cast<double>(width) / static_cast<double>(height), near, far); | |
| 71 glMatrixMode(GL_MODELVIEW); | |
| 72 } | |
| 73 | |
| 74 // https://www.codemiles.com/c-opengl-examples/drawing-teapot-using-opengl-t9010.html?mobile=on | |
| 75 void PartRenderer::paintGL() | |
| 76 { | |
| 77 glMatrixMode(GL_MODELVIEW); | |
| 78 // clear the drawing buffer. | |
| 79 glClear(GL_COLOR_BUFFER_BIT); | |
| 80 // clear the identity matrix. | |
| 81 glLoadIdentity(); | |
| 82 // traslate the draw by z = -4.0 | |
| 83 // Note this when you decrease z like -8.0 the drawing will looks far , or smaller. | |
| 84 glTranslatef(0.0,0.0,-4.5); | |
| 85 // Red color used to draw. | |
| 86 glColor3f(0.8, 0.2, 0.1); | |
| 87 glMultMatrixf(padMatrix(this->rotation.toRotationMatrix()).constData()); | |
| 88 glutSolidTeapot(1.0); | |
| 89 glFlush(); | |
| 90 } | |
| 91 | |
| 92 static QPointF pointToPointF(const QPoint& point) | |
| 93 { | |
| 94 return {static_cast<qreal>(point.x()), static_cast<qreal>(point.y())}; | |
| 95 } | |
| 96 | |
| 97 /* | |
| 98 static QPoint pointFToPoint(const QPointF& point) | |
| 99 { | |
| 100 return {static_cast<int>(std::round(point.x())), static_cast<int>(std::round(point.y()))}; | |
| 101 } | |
| 102 */ | |
| 103 | |
| 104 void PartRenderer::mouseMoveEvent(QMouseEvent* event) | |
| 105 { | |
| 106 const bool left = event->buttons() & Qt::LeftButton; | |
| 107 const QPointF move = pointToPointF(event->pos()) - this->lastMousePosition; | |
| 108 if (left and not move.isNull()) | |
| 109 { | |
| 110 const QQuaternion versor = QQuaternion::fromAxisAndAngle( | |
| 111 QVector3D{static_cast<float>(move.y()), static_cast<float>(move.x()), 0.0f}, | |
| 112 0.6 * std::hypot(move.x(), move.y()) | |
| 113 ); | |
| 114 this->rotation = versor * this->rotation; | |
| 115 this->update(); | |
| 116 } | |
| 117 this->lastMousePosition = pointToPointF(event->pos()); | |
| 118 } |
