To render to a hardware-accelerated off-screen surface, we can use the pbuffer and framebuffer object extensions, which are available through the QGLPixelBuffer and QGLFramebufferObject classes. Using QGLWidget, we can draw 3D scenes on the screen, using OpenGL as the back-end. In the chapter's second section, we will show how to combine 2D and 3D drawing in the same widget using a mixture of QPainter and OpenGL commands. Another benefit of using QPainter is that we can use its higher-level API for 2D graphics, and combine it with OpenGL calls to perform 3D graphics. One huge benefit of this is that we get the high performance of OpenGL for most drawing operations, such as transformations and pixmap drawing. Starting with Qt 4, it is possible to use a QPainter on a QGLWidget as though it were a normal QWidget. The first section of this chapter presents a simple application that uses this technique to draw a tetrahedron and lets the user interact with it using the mouse. For many 3D applications, this is sufficient. The module provides the QGLWidget class, which we can subclass to develop our own widgets that draw themselves using OpenGL commands. Qt applications can draw 3D graphics by using the QtOpenGL module, which relies on the system's OpenGL library. OpenGL is a standard API for rendering 3D graphics. Doing Overlays Using Framebuffer Objects.These APIs are called before calling the functions displa圜AR() and scoredisp() and finally glFlush() forces the buffered OpenGL commands to execute.C++ GUI Programming with Qt4, 2nd Edition The glMatrixMode() API is used to operate on the model-view matrix and glLoadIdentity() API is used to reset the model-view matrix. In this function two functions are being called displa圜AR() and scoredisp(). The following functions are registered to be used in the program :Īnd finally, glutMainLoop() is used to enter the event processing loop and calls the functions which are registered in the body of the main function.ĭisplay – The display function registers call back handler for window re-paint. The window is created using glutCreateWindow(“TWIN CARS”) and the name of the created window is given in quotes. The size and position of the window is defined using glutInitWindowSize(width,height), glutInitWindowPosition(posX,posY) respectively. The glutInit() initializes the window system and to enable the single buffered mode glutInitDisplayMode(GLUT_SINGLE) is used. Main – In OpenGL, GLUT runs as a console application starting at main. If either car is collide with the block the game ends and the score card is displayed. such that it must not collide with the blocks. We must move both the cars according to the x-axis using keyboard buttons such as a/A,d/D,j/J,l/L. See also Bricks breaker Computer Graphics Project in OpenGL Source Code – 18CSL67
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