baratli | Bonjour,
Je commence a développer avec Qt et OpenGL. J'ai réussi a dessiner des polygones en utilisant les VBO mais j'ai des problèmes lors du picking en effet tout les polygones en le même nom. Merci pour votre aides
Code :
- myWindow::myWindow(QWidget *parent) :
- myGLWidget(60, parent), m_vertexbuffer(QGLBuffer::VertexBuffer),
- m_indicebuffer(QGLBuffer::IndexBuffer) {
- rotationX = -21.0;
- rotationY = -57.0;
- rotationZ = 0.0;
- for (int i = 0; i <= 4999; i++) {
- Rainbow[i] = 0.5f;
- }
- }
- void myWindow::initializeGL() {
- qglClearColor(Qt::black);
- glShadeModel( GL_FLAT);
- glEnable( GL_DEPTH_TEST);
- glEnable( GL_CULL_FACE);
- vertices_by_x = 4;
- vertices_by_y = 2;
- quads_by_x = 2;
- quads_by_y = 1;
- QVector3D vertice;
- float cx = -0.5;
- float cy = 0.5;
- m_vertices.reserve(vertices_by_x * vertices_by_y);
- for (int i = 0; i < 24; i++) {
- Rainbow[i] = 1.0f;
- }
- for (int y = 0; y < vertices_by_y; ++y) {
- for (int x = 0; x < vertices_by_x; ++x) {
- vertice.setX(cx);
- vertice.setY(cy);
- vertice.setZ(0.0);
- m_vertices.push_back(vertice);
- cx = cx + 0.4;
- }
- cx = -0.5;
- cy = cy - 0.4;
- }
- m_indices.reserve(quads_by_x * quads_by_y * 6);
- int name=0;
- for (int y = 0; y < quads_by_y; ++y) {
- int i = 2 * y * vertices_by_x;
- for (int x = 0; x < quads_by_x; ++x) {
- glLoadName(name);
- name++;
- m_vertexarray.push_back(m_vertices[i]);
- m_vertexarray.push_back(m_vertices[i + vertices_by_x]);
- m_vertexarray.push_back(m_vertices[i + 1]);
- m_vertexarray.push_back(m_vertices[i + 1]);
- m_vertexarray.push_back(m_vertices[i + vertices_by_x]);
- m_vertexarray.push_back(m_vertices[i + 1 + vertices_by_x]);
- // Indices
- m_indices.push_back(i);
- m_indices.push_back(i + vertices_by_x);
- m_indices.push_back(i + 1);
- m_indices.push_back(i + 1);
- m_indices.push_back(i + vertices_by_x);
- m_indices.push_back(i + 1 + vertices_by_x);
- i = i + 2;
- }
- }
- // Vertex buffer init
- m_vertexbuffer.create();
- m_vertexbuffer.bind();
- m_vertexbuffer.allocate(m_vertices.constData(),
- m_vertices.size() * sizeof(QVector3D));
- m_vertexbuffer.release();
- // Indices buffer init
- m_indicebuffer.create();
- m_indicebuffer.bind();
- m_indicebuffer.allocate(m_indices.constData(),
- m_indices.size() * sizeof(GLuint));
- m_indicebuffer.release();
- }
- void myWindow::resizeGL(int width, int height) {
- glViewport(0, 0, width, height);
- glMatrixMode( GL_PROJECTION);
- glLoadIdentity();
- GLfloat x = GLfloat(width) / height;
- glFrustum(-x, x, -1.0, 1.0, 4.0, 15.0);
- glMatrixMode( GL_MODELVIEW);
- }
- void myWindow::paintGL() {
- cptPaintGL++;
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- draw();
- }
- void myWindow::draw() {
- glMatrixMode( GL_MODELVIEW);
- glLoadIdentity();
- glTranslatef(0.0, 0.0, -10.0);
- glRotatef(rotationX, 1.0, 0.0, 0.0);
- glRotatef(rotationY, 0.0, 1.0, 0.0);
- glRotatef(rotationZ, 0.0, 0.0, 1.0);
- glEnableClientState( GL_VERTEX_ARRAY);
- glEnableClientState( GL_COLOR_ARRAY);
- m_vertexbuffer.bind();
- glVertexPointer(3, GL_FLOAT, 0, NULL);
- m_vertexbuffer.release();
- glColorPointer(3, GL_FLOAT, 0, Rainbow);
- m_indicebuffer.bind();
- glDrawElements(GL_TRIANGLES, m_indices.size(), GL_UNSIGNED_INT, NULL);
- m_indicebuffer.release();
- glDisableClientState(GL_COLOR_ARRAY);
- glDisableClientState(GL_VERTEX_ARRAY);
-
- }
- void myWindow::mousePressEvent(QMouseEvent *event) {
- lastPos = event->pos();
- }
- void myWindow::mouseMoveEvent(QMouseEvent *event) {
- GLfloat dx = GLfloat(event->x() - lastPos.x()) / width();
- GLfloat dy = GLfloat(event->y() - lastPos.y()) / height();
- if (event->buttons() & Qt::LeftButton) {
- rotationX += 180 * dy;
- rotationY += 180 * dx;
- updateGL();
- } else if (event->buttons() & Qt::RightButton) {
- rotationX += 180 * dy;
- rotationZ += 180 * dx;
- updateGL();
- }
- lastPos = event->pos();
- }
- void myWindow::mouseDoubleClickEvent(QMouseEvent *event) {
- int face = faceAtPosition(event->pos());
- qDebug() << face;
- if (face != -1) {
- updateGL();
- }
- }
- int myWindow::faceAtPosition(const QPoint &pos) {
- const int MaxSize = 512;
- GLuint buffer[MaxSize];
- GLint viewport[4];
- glGetIntegerv(GL_VIEWPORT, viewport);
- glSelectBuffer(MaxSize, buffer);
- glRenderMode( GL_SELECT);
- glInitNames();
- glPushName(0);
- glMatrixMode( GL_PROJECTION);
- glPushMatrix();
- glLoadIdentity();
- gluPickMatrix(GLdouble(pos.x()), GLdouble(viewport[3] - pos.y()), 5.0, 5.0,
- viewport);
- GLfloat x = GLfloat(width()) / height();
- glFrustum(-x, x, -1.0, 1.0, 4.0, 15.0);
- draw();
- glMatrixMode(GL_PROJECTION);
- glPopMatrix();
- if (!glRenderMode(GL_RENDER))
- return -1;
- return buffer[3];
- }
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Ne pas faire !!
