main.cpp Example File

hellogles3/main.cpp

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  #include <QGuiApplication>
  #include <QSurfaceFormat>
  #include <QOpenGLContext>

  #include "glwindow.h"

  // This example demonstrates easy, cross-platform usage of OpenGL ES 3.0 functions via
  // QOpenGLExtraFunctions in an application that works identically on desktop platforms
  // with OpenGL 3.3 and mobile/embedded devices with OpenGL ES 3.0.

  // The code is always the same, with the exception of two places: (1) the OpenGL context
  // creation has to have a sufficiently high version number for the features that are in
  // use, and (2) the shader code's version directive is different.

  int main(int argc, char *argv[])
  {
      QGuiApplication app(argc, argv);

      QSurfaceFormat fmt;
      fmt.setDepthBufferSize(24);

      // Request OpenGL 3.3 compatibility or OpenGL ES 3.0.
      if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL) {
          qDebug("Requesting 3.3 compatibility context");
          fmt.setVersion(3, 3);
          fmt.setProfile(QSurfaceFormat::CompatibilityProfile);
      } else {
          qDebug("Requesting 3.0 context");
          fmt.setVersion(3, 0);
      }

      QSurfaceFormat::setDefaultFormat(fmt);

      GLWindow glWindow;
      glWindow.showMaximized();

      return app.exec();
  }