Qt5 C++ GUI Programming Cookbook - Second Edition

How to do it...

Let's follow these steps to learn how to use textures in OpenGL:

1. Open up renderwindow.h and add the variables, that are highlighted in the following code block:

QOpenGLContext* openGLContext;QOpenGLFunctions* openGLFunctions;QOpenGLShaderProgram* shaderProgram;QOpenGLVertexArrayObject* vao;QOpenGLBuffer* vbo_vertices;QOpenGLBuffer* vbo_uvs;QOpenGLTexture* texture;

2. We must call glEnable(GL_TEXTURE_2D) in the initializeGL() function to enable the texture mapping feature:

void RenderWindow::initializeGL(){    openGLFunctions = openGLContext->functions();    glEnable(GL_DEPTH_TEST);    glEnable(GL_TEXTURE_2D);

3. We need to initialize our texture variable under the QOpenGLTexture class. We will load a texture image called brick.jpg