Qt+opengl实现分屏效果

#include "WOpenGLWidget.h" #include <QPainter> #include <QOpenGLPaintDevice> #include <qglobal.h> #include <qmath.h> static float vertices[] = { // ---- 位置 ---- - 纹理坐标 - 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, // 右上 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, // 右下 -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, // 左下 -1.0f, 1.0f, 0.0f, 0.0f, 1.0f // 左上 }; static int indices[] = { 0, 1, 3, 1, 2, 3 }; WOpenGLWidget::WOpenGLWidget(QWidget* parent) : QOpenGLWidget(parent) { QSurfaceFormat format; format.setDepthBufferSize(24); format.setVersion(3,3); format.setProfile(QSurfaceFormat::CoreProfile); setFormat(format); } void WOpenGLWidget::setSplit(SplitType type) { makeCurrent(); m_program->bind(); m_program->setUniformValue("split",type); //范围[0,2] doneCurrent(); update(); } void WOpenGLWidget::initializeGL() { initializeOpenGLFunctions(); m_program = new QOpenGLShaderProgram(); m_program->addShaderFromSourceFile(QOpenGLShader::Vertex,":/shapesChange.vert"); m_program->addShaderFromSourceFile(QOpenGLShader::Fragment,":/shapesChange.frag"); m_program->link(); //==========带纹理的图片使用的VAO VBO================ glGenVertexArrays(1, &m_VAO); glGenBuffers(1, &m_VBO); glBindVertexArray(m_VAO);//绑定VAO glBindBuffer(GL_ARRAY_BUFFER, m_VBO);//顶点缓冲对象的缓冲类型是GL_ARRAY_BUFFER glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);//把顶点数据复制到缓冲的内存中GL_STATIC_DRAW ：数据不会或几乎不会改变。 glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0); glEnableVertexAttribArray(0); glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat))); glEnableVertexAttribArray(1); glBindBuffer(GL_ARRAY_BUFFER, 0); glGenBuffers(1, &m_EBO); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_EBO); glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW); glBindVertexArray(0);//解绑VAO //==========带纹理的图片使用的VAO VBO================ m_glTexture = new QOpenGLTexture(QImage("./demo.jpeg").mirrored()); m_program->bind(); m_program->setUniformValue("ourTexture",0); QMatrix4x4 model; model.setToIdentity(); m_program->setUniformValue("model", model); } void WOpenGLWidget::paintGL() { glClearColor(1.0f,1.0f,1.0f,1.0f); glClear(GL_COLOR_BUFFER_BIT); glEnable(GL_DITHER); m_program->bind(); m_glTexture->bind(0); glBindVertexArray(m_VAO);//绑定VAO glDrawElements(GL_TRIANGLES,6,GL_UNSIGNED_INT,0); glBindTexture(GL_TEXTURE_2D,0); glBindVertexArray(0); } void WOpenGLWidget::resizeGL(int w, int h) { }