What is glutDisplayFunc opengl?
What is glutDisplayFunc opengl?
Description. glutDisplayFunc sets the display callback for the current window. When GLUT determines that the normal plane for the window needs to be redisplayed, the display callback for the window is called.
What is GLUT post redisplay?
glutPostRedisplay marks the current window as needing to be redisplayed. Usage void glutPostRedisplay(void); Description. Mark the normal plane of current window as needing to be redisplayed. The next iteration through glutMainLoop, the window’s display callback will be called to redisplay the window’s normal plane.
What is callback function in opengl?
A callback function is a function which the library (GLUT) calls when it needs to know how to proccess something. e.g. when glut gets a key down event it uses the glutKeybourdFunc callback routine to find out what to do with a key press.
What is glutIdleFunc?
DESCRIPTION. glutIdleFunc sets the global idle callback to be func so a GLUT program can perform background processing tasks or continuous animation when window system events are not being received. If enabled, the idle callback is continuously called when events are not being received.
What type of function is glutDisplayFunc ()?
glutDisplayFunc(void (*func)(void)) is the first and most important event callback function you will see. Whenever GLUT determines that the contents of the window need to be redisplayed, the callback function registered by glutDisplayFunc() is executed.
What is the use of glutMainLoop ()?
glutMainLoop tells the program to enter the GLUT event processing loop. (This just means the program sits and waits for things to happen, such as window refreshes, window resizes, mouse clicks, key presses, etc.) glutMainLoop never exits, so it should always be the last line of the main program.
What is glutSwapBuffers in opengl?
Description. Performs a buffer swap on the layer in use for the current window. Specifically, glutSwapBuffers promotes the contents of the back buffer of the layer in use of the current window to become the contents of the front buffer. The contents of the back buffer then become undefined.
What is glFlush in OpenGL?
glFlush() empties all commands in these buffers and forces all pending commands will to be executed immediately without waiting buffers are full. Therefore glFlush() guarantees that all OpenGL commands made up to that point will complete executions in a finite amount time after calling glFlush().
What is glutMainLoop in OpenGL?
What is idle function in opengl?
Description. glutIdleFunc sets the global idle callback to be func so a GLUT program can perform background processing tasks or continuous animation when window system events are not being received. If enabled, the idle callback is continuously called when events are not being received.
What are GL primitives?
In OpenGL, an object is made up of geometric primitives such as triangle, quad, line segment and point. A primitive is made up of one or more vertices. OpenGL supports the following primitives: A geometric primitive is defined by specifying its vertices via glVertex function, enclosed within a pair glBegin and glEnd .
How do I change the background color in OpenGL?
glClearColor(0,0,1,0); then recompile the program and run it. The background of the OpenGL window should be blue. Colors in OpenGL are typically represented in RGB or RGBA mode.
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