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Discuss the following OpenGL function 1. | glOrtho(left,right,bottom,top,near,far); | gluOrtho2D(left,right,bott,top); 2. | glClear(GL_COLOR_BUFFER_BIT); glFlush(); 3. | glClearColor(R,G,B,A); giColor3f(R,G,B) | giColor3b() [ giColor3d() 4. | glutWireSphere(radius,slices, stacks); glutSolidSphere(.55,30,10); 5. | glutWireCone(rad,length,slices,stacks); | glutSolidCone(.6,1,100,10); 6. | glutWireTorus(inner rad,out rad,60,50); | glutSolidTorus(0.3, 0.7, 60,50); 7. | glutWireCube(size); glutSolidTeapot(radius); 8. | glutSwapBuffers(); glFlush(); 9. | glutinitDisplayMode(GLUT DOUBLE | GLUT_RGBA); 10.| glViewport(x,y,width, height); | glutMainLoop(); 11] glBegin(GL_LINE_LOOP); GL_LINE_STRIP, GL_LINES, GL_POLYGON,GL_POINTS 12] glVertex2i(x, y); | glVertex3f(x,y,z); 13,| glEnd(); 14 glRecti(x1,y1,x2,y2); 15,| glutCreateMenu(handling function) glutAttachMenu(GLUT_RIGHT BUTTON); 16,| glutAddMenuEntry(“visible text”, value); 17,| glutDisplayFunc(f) glutMouseFunc(f) | glutkeyboardFunc(f) | glutMotionFunc() 18,| glutidleFunc(renderScene); 19,| giScaled(x,y,z) glRotated(ang,x,y,z) | glTranslated(x,y,z) 20,| glMatrixMode(GL_PROJECTION); glloadidentity(); 
