How to use mouse to move window in XZ plane in opengl -

How to use mouse to move window in XZ plane in opengl -

i want move view in xz plane, when move mouse. mlon , mlat linear function of mouse coordinate x , y. have glutpassivemotionfunc(mouse_motion); in main function. need in order move window view in xz plane? explanation?

void mouse_motion(int x, int y) { /* completed */ x=lon+mlon; y=lat+mlat; } // mouse_motion()

i'd start calling glutpostredisplay in mouse motion handler scene gets redrawn. redraw updated position.

opengl