Heading to OpenGL GameMode

Here is a source code that head directly into the opengl game mode and draw the glSoildTeapot ,

and I also add the keyboard function , you can zoop in teapot using ‘w’ key and zoom out using

‘e’ key.And you can quit from application pressing ‘q’.

Here is the source code.

#include <stdlib.h>
#include <stdio.h>

#include <GL/gl.h>
#include <GL/glut.h>


double gTeaPotSize = 0.5 ;

void display_function ( void);
/* keyboard function */
void keyboard_function ( unsigned char key , int x  ,int y)
{
 if ( key=='q')
 exit(0);

 if (key == 'w' )
 gTeaPotSize += 0.05;
 glutDisplayFunc( display_function);
 glutPostRedisplay();
 if (key == 'e')
 gTeaPotSize -= 0.05;
 glutDisplayFunc(display_function);
 glutPostRedisplay();
}

/* display function */
void display_function ( void)
{


 glClearColor ( 0.5,0.22,.022,1.0);
 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) ;
 glutWireTeapot(gTeaPotSize);

}


/* the main function */
int main( int argc , char ** argv)
{
 glutInit( &argc , argv);
 glutInitDisplayMode( GLUT_SINGLE | GLUT_RGBA );
 glutGameModeString("640x480@60");
 glutEnterGameMode();
//    glutInitWindowPosition(0,0 );
 glutFullScreen();
//    int i = glutCreateWindow( "The Ch02 program ");
 glutDisplayFunc ( display_function);
 glutKeyboardFunc ( keyboard_function);
 glutMainLoop();
//    glutDestroyWindow(i);
}

And by assuming that you save your source code as teapot.cc , type these command on the shell to compile this program.

$gcc -o teapot teapot.cc -lglut

and here’s how it’s running.

Try it YourSelf.

–Happy Coding–