Qt学习笔记-OpenGL做正方体并旋转

运行截图如下图：

代码如下：

myglwidget.h

#ifndef MYGLWIDGET_H #define MYGLWIDGET_H  #include <QOpenGLWidget> #include <QOpenGLFunctions> #include <QOpenGLBuffer>  class QOpenGLTexture; class QOpenGLShaderProgram;  class MyGLWidget:public QOpenGLWidget,protected QOpenGLFunctions {     Q_OBJECT public:     MyGLWidget(QWidget *parent=0);  protected:     void initializeGL();     void paintGL();     void resizeGL(int w, int h);     void keyPressEvent(QKeyEvent *evnet);  private:     QOpenGLShaderProgram *program;     QOpenGLBuffer vbo;     QOpenGLTexture *textures[6];     GLfloat translate,xRot,yRot,zRot; };  #endif // MYGLWIDGET_H 

myglwidget.cpp

#include "myglwidget.h" #include <QOpenGLShaderProgram> #include <QOpenGLTexture> #include <QDebug> #include <QKeyEvent>  MyGLWidget::MyGLWidget(QWidget *parent)     :QOpenGLWidget(parent) {     translate = -6.0;     xRot = zRot = 0.0;     yRot = -30.0; }  void MyGLWidget::initializeGL(){     initializeOpenGLFunctions();     glEnable(GL_DEPTH_TEST);     for(int i=0; i<6; ++i){         textures[i] = new QOpenGLTexture(QImage(                                              QString(":/img/side%1.png").arg(i+1)).mirrored());     }     QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex,this);     const char *vsrc =             "#version 130\n"             "in vec4 vPosition;                         \n"             "in vec2 vTexCoord;                         \n"             "out vec2 texCoord;                         \n"             "uniform mat4 matrix;                       \n"             "void main() {                              \n"             "    texCoord = vTexCoord;                  \n"             "    gl_Position = matrix * vPosition;      \n"             "}\n";     vshader->compileSourceCode(vsrc);     QOpenGLShader *fshader = new QOpenGLShader(QOpenGLShader::Fragment,this);     const char *fsrc =                 "#version 130\n"                 "uniform sampler2D tex;                     \n"                 "in vec2 texCoord;                          \n"                 "out vec4 fColor;                           \n"                 "void main() {                              \n"                 "    fColor = texture(tex, texCoord);       \n"                 "}\n";     fshader->compileSourceCode(fsrc);      program = new QOpenGLShaderProgram;     program->addShader(vshader);     program->addShader(fshader);     program->link();     program->bind(); }  void MyGLWidget::paintGL(){     int w = width();     int h = height();     int side = qMin(w,h);     glViewport((w-side)/2,(h-side)/2,side,side);      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);      GLfloat vectices[6][4][3]=     {         {{1.0f,1.0f,1.0f},{1.0f,1.0f,-1.0f},{1.0f,-1.0f,-1.0f},{1.0f,-1.0f,1.0f}},         {{-1.0f,1.0f,1.0f},{-1.0f,1.0f,-1.0f},{-1.0f,-1.0f,-1.0f},{-1.0f,-1.0f,1.0f}},         {{1.0f,1.0f,1.0f},{-1.0f,1.0f,1.0f},{-1.0f,1.0f,-1.0f},{1.0f,1.0f,-1.0f}},         {{1.0f,-1.0f,1.0f},{-1.0f,-1.0f,1.0f},{-1.0f,-1.0f,-1.0f},{1.0f,-1.0f,-1.0f}},         {{1.0f,1.0f,1.0f},{1.0f,-1.0f,1.0f},{-1.0f,-1.0f,1.0f},{-1.0f,1.0f,1.0f}},         {{1.0f,1.0f,-1.0f},{1.0f,-1.0f,-1.0f},{-1.0f,-1.0f,-1.0f},{-1.0f,1.0f,-1.0f}},     };      GLfloat coords[6][4][2] =     {         { {0.0f, 1.0f}, {0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, 1.0f} },         { {0.0f, 1.0f}, {0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, 1.0f} },         { {0.0f, 1.0f}, {0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, 1.0f} },         { {0.0f, 1.0f}, {0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, 1.0f} },         { {0.0f, 1.0f}, {0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, 1.0f} },         { {0.0f, 1.0f}, {0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, 1.0f} },     };      vbo.create();     vbo.bind();     vbo.allocate((72+48)*sizeof(GLfloat));       vbo.write(0,vectices,72*sizeof(GLfloat));     GLuint vPosition = program->attributeLocation("vPosition");     program->setAttributeBuffer(vPosition,GL_FLOAT,0,3,0);     glEnableVertexAttribArray(vPosition);      vbo.write(72* sizeof(GLfloat), coords, 48*sizeof(GLfloat));     GLuint vTexCoord = program->attributeLocation("vTexCoord");     program->setAttributeBuffer(vTexCoord, GL_FLOAT, 72* sizeof(GLfloat), 2, 0);     glEnableVertexAttribArray(vTexCoord);     program->setUniformValue("tex", 0);      QMatrix4x4 matrix;     matrix.perspective(45.0f, (GLfloat)w / (GLfloat)h, 0.1f, 100.0f);     matrix.translate(0, 0, translate);     matrix.rotate(xRot, 1, 0, 0);     matrix.rotate(yRot, 0, 1, 0);     matrix.rotate(zRot, 0, 0, 1);     program->setUniformValue("matrix",matrix);      for(int i=0; i<6; i++) {             textures[i]->bind();             glDrawArrays(GL_TRIANGLE_FAN, i*4, 4);         } }  void MyGLWidget::resizeGL(int w, int h){  }  void MyGLWidget::keyPressEvent(QKeyEvent *event) {     switch (event->key()) {     case Qt::Key_Up:         xRot += 10;         break;     case Qt::Key_Left:         yRot += 10;         break;     case Qt::Key_Right:         zRot += 10;         break;     case Qt::Key_Down:         translate -= 1;         break;     case Qt::Key_Space:         translate += 1;         break;     default:         break;     }     update();     QOpenGLWidget::keyPressEvent(event); } 

main.cpp

#include <QApplication> #include "myglwidget.h"  int main(int argc, char *argv[]) {     QApplication a(argc, argv);     MyGLWidget w;     w.resize(800,600);     w.show();      return a.exec(); } 

文章来源: Qt学习笔记-OpenGL做正方体并旋转