Unsolved How do I add Vertex Induces to this OpenGL code
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This is the only textured 3D Shape that I could find that works after going through a lot of tutorials on Github. I want to be able to expand it so That I can work on my own implementations like model loading.
#ifndef PAINTINGWIDGET_H #define PAINTINGWIDGET_H #include <QOpenGLWidget> #include <QOpenGLContext> #include <QOpenGLBuffer> #include <QOpenGLFunctions> #include <QOpenGLShaderProgram> #include <QOpenGLVertexArrayObject> #include <QOpenGLTexture> #include <QElapsedTimer> #include <QKeyEvent> class PaintingWidget : public QOpenGLWidget { Q_OBJECT public: PaintingWidget(QWidget *parent); ~PaintingWidget(); protected: void initializeGL(); void paintGL(); void resizeGL(int w, int h); void keyPressEvent(QKeyEvent *keyEvent); private: void computeNormalVectors(size_t); QOpenGLBuffer *m_vbo, *m_cbo, *m_uvbo; QOpenGLVertexArrayObject *m_vao; QOpenGLShaderProgram *m_shader; QOpenGLTexture *m_texture; QElapsedTimer *m_timer; float aspectRatio; GLfloat normalBuffer[4 * 3 *3]; GLfloat vertexData[4 * 3 * 3]; GLfloat uvData[4 * 3 * 2]; QVector3D camera_pos, light_pos; }; #endif // PAINTINGWIDGET_H#include "paintingwidget.h" PaintingWidget::PaintingWidget(QWidget* parent): QOpenGLWidget (parent), camera_pos(0.0f, 3.0f, 0.0f), light_pos(0.0f, 4.0f, 0.0f), m_vbo(nullptr), m_vao(nullptr), m_shader(nullptr), m_timer(nullptr), m_texture(nullptr){ const GLfloat VERTEX_INIT_DATA[] = { //face 1 -0.5f, 0.0f, -0.2887f, 0.0f, 0.0f, 0.5774f, 0.5f, 0.0f, -0.2887f, //face 2 -0.5f, 0.0f, -0.2887f, 0.5f, 0.0f, -0.2887f, 0.0f, 0.8165f, 0.0f, //face 3 -0.5f, 0.0f, -0.2887f, 0.0f, 0.8165f, 0.0f, 0.0f, 0.0f, 0.5774f, //face 4 0.5f, 0.0f, -0.2887f, 0.0f, 0.0f, 0.5774f, 0.0f, 0.8165f, 0.0f, }; const GLfloat UV_INIT_DATA[] = { 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, }; memcpy(this->vertexData, VERTEX_INIT_DATA, sizeof(this->vertexData)); memset(this->normalBuffer, 0, sizeof(this->normalBuffer)); computeNormalVectors(4); memcpy(this->uvData, UV_INIT_DATA, sizeof(this->uvData)); aspectRatio = (float) 800 / 600; m_timer = new QElapsedTimer; m_timer->start(); setFocusPolicy(Qt::StrongFocus); } PaintingWidget::~PaintingWidget(){ } void PaintingWidget::computeNormalVectors(size_t num_vertices){ for (size_t i=0;i<num_vertices;++i){ GLfloat v1x = this->vertexData[i * 9]; GLfloat v1y = this->vertexData[i * 9 + 1]; GLfloat v1z = this->vertexData[i * 9 + 2]; GLfloat v2x = this->vertexData[i * 9 + 3]; GLfloat v2y = this->vertexData[i * 9 + 4]; GLfloat v2z = this->vertexData[i * 9 + 5]; GLfloat v3x = this->vertexData[i * 9 + 6]; GLfloat v3y = this->vertexData[i * 9 + 7]; GLfloat v3z = this->vertexData[i * 9 + 8]; GLfloat x1 = v2x - v1x, y1 = v2y - v1y, z1 = v2z - v1z; GLfloat x2 = v3x - v1x, y2 = v3y - v1y, z2 = v3z - v1z; GLfloat nx = y1 *z2 - z1 * y2; GLfloat ny = z1 * x2 - x1 * z2; GLfloat nz = x1 * y2 - y1 * x2; for (int j=0;j<3;++j){ this->normalBuffer[i * 9 + j * 3] = nx; this->normalBuffer[i * 9 + j * 3 + 1] = ny; this->normalBuffer[i * 9 + j * 3 + 2] = nz; } } } void PaintingWidget::initializeGL() { QOpenGLFunctions *f = this->context()->functions(); f->glEnable(GL_DEPTH_TEST); m_texture = new QOpenGLTexture(QImage(":/imgs/lenna.png")); m_shader = new QOpenGLShaderProgram(); m_shader->addShaderFromSourceFile(QOpenGLShader::Vertex, ":/shaders/vertexShader.shader"); m_shader->addShaderFromSourceFile(QOpenGLShader::Fragment, ":/shaders/fragmentShader.shader"); if (m_shader->link()) { qDebug("Shaders link success."); } else { qDebug("Shaders link failed!"); } m_vao = new QOpenGLVertexArrayObject(); m_vbo = new QOpenGLBuffer(QOpenGLBuffer::Type::VertexBuffer); m_cbo = new QOpenGLBuffer(QOpenGLBuffer::Type::VertexBuffer); m_uvbo = new QOpenGLBuffer(QOpenGLBuffer::Type::VertexBuffer); m_vao->create(); m_vao->bind(); m_vbo->create(); m_vbo->bind(); m_vbo->allocate(this->vertexData, 4 * 3 * 3 * sizeof(GLfloat)); f->glEnableVertexAttribArray(0); f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,3*sizeof(GLfloat), 0); m_vbo->release(); m_cbo->create(); m_cbo->bind(); m_cbo->allocate(this->normalBuffer, 4*3*3*sizeof(GLfloat)); f->glEnableVertexAttribArray(1); f->glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 3*sizeof(GLfloat), 0); m_cbo->release(); m_uvbo->create(); m_uvbo->bind(); m_uvbo->allocate(this->uvData, 4 * 3 * 2 * sizeof(GLfloat)); f->glEnableVertexAttribArray(2); f->glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 2*sizeof(GLfloat), 0); m_uvbo->release(); m_vao->release(); } void PaintingWidget::paintGL() { QOpenGLFunctions *f = this->context()->functions(); f->glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); f->glClearColor(0.0f, 0.2f, 0.0f, 1.0f); m_vao->bind(); m_shader->bind(); m_texture->bind(); QMatrix4x4 vpMat; vpMat.perspective(45.0f, this->aspectRatio, 0.1f, 100.0f); QVector3D center(0.0, 0.0, 0.0); center.setY(0); vpMat.lookAt(camera_pos, center, QVector3D(1.0f, 0.0f, 0.0f)); QMatrix4x4 modelMat; float time_in_second = (float)m_timer->elapsed() / 1000; modelMat.rotate(30.0f * time_in_second, QVector3D(0.7f, 0.5f, 0.2f)); m_shader->setUniformValue(m_shader->uniformLocation("vpMat"), vpMat); m_shader->setUniformValue(m_shader->uniformLocation("modelMat"), modelMat); m_shader->setUniformValue(m_shader->uniformLocation("lightPos"), light_pos); m_shader->setUniformValue(m_shader->uniformLocation("cameraPos"), camera_pos); f->glDrawArrays(GL_TRIANGLES, 0, 4 * 3); m_texture->release(); m_shader->release(); m_vao->release(); this->update(); } void PaintingWidget::resizeGL(int w, int h) { aspectRatio = (float)w / h; } void PaintingWidget::keyPressEvent(QKeyEvent *keyEvent){ switch (keyEvent->key()){ case Qt::Key_Right: camera_pos.setZ(camera_pos.z() + 0.1f); break; case Qt::Key_Left: camera_pos.setZ(camera_pos.z() - 0.1f); break; case Qt::Key_Up: camera_pos.setX(camera_pos.x() + 0.1f); break; case Qt::Key_Down: camera_pos.setX(camera_pos.x() - 0.1f); break; case Qt::Key_Plus: camera_pos.setY(camera_pos.y() + 0.1f); break; case Qt::Key_Minus: camera_pos.setY(camera_pos.y() - 0.1f); break; } update(); }