src_gui_opengl_qopenglfunctions.cpp

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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QOpenGLFunctions>
#include <QtOpenGL/QOpenGLWindow>
 
#include <QSurface>
#include <QWidget>
#include <QWindow>
 
namespace src_gui_opengl_qopenglfunctions {
 
//! [0]
class MyGLWindow : public QWindow, protected QOpenGLFunctions
{
    Q_OBJECT
public:
    explicit MyGLWindow(QScreen *screen = nullptr);
 
protected:
    void initializeGL();
    void paintGL();
 
    QOpenGLContext *m_context;
};
 
MyGLWindow::MyGLWindow(QScreen *screen)
  : QWindow(screen)
{
    setSurfaceType(OpenGLSurface);
    create();
 
    // Create an OpenGL context
    m_context = new QOpenGLContext;
    m_context->create();
 
    // Setup scene and render it
    initializeGL();
    paintGL();
};
 
void MyGLWindow::initializeGL()
{
    m_context->makeCurrent(this);
    initializeOpenGLFunctions();
}
//! [0]
 
 
int textureId = 0;
 
//! [1]
void MyGLWindow::paintGL()
{
    m_context->makeCurrent(this);
    glActiveTexture(GL_TEXTURE1);
    glBindTexture(GL_TEXTURE_2D, textureId);
    // ...
    m_context->swapBuffers(this);
    m_context->doneCurrent();
}
//! [1]
 
 
void wrapper0() {
//! [2]
QOpenGLFunctions glFuncs(QOpenGLContext::currentContext());
glFuncs.glActiveTexture(GL_TEXTURE1);
//! [2]
} // wrapper0
 
 
void wrapper1() {
//! [3]
QOpenGLFunctions *glFuncs = QOpenGLContext::currentContext()->functions();
glFuncs->glActiveTexture(GL_TEXTURE1);
//! [3]
 
 
//! [4]
QOpenGLFunctions funcs(QOpenGLContext::currentContext());
bool npot = funcs.hasOpenGLFeature(QOpenGLFunctions::NPOTTextures);
//! [4]
 
Q_UNUSED(npot);
} // wrapper1
} // src_gui_opengl_qopenglfunctions