/*****************************************************************************
                   Perspective routines for CS480
******************************************************************************
    Author: 
******************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <gl/gl.h>
#include <gl/device.h>
#include "draw.h"

/*
             Write a routine that computes the 4x4 perspective projection matrix, 
             by first computing 4 intermediate matrices:
	     
	     Mview -- the 4x4 matrix that describes the transform from camera
	              to world coordinates.
		      
	     Mshear -- the 4x4 matrix that shears the perspective viewing
	               frustrum axis into alignment with the z axis.

	     Mscale -- the 4x4 matrix that scales the viewing frustrum into
	               a parallelpiped.
		       
	     Mnorm -- the 4x4 matrix that describes the transform from
		       the view-plane window to the screen window
		       (viewport to device coordinate
		       transform). Rather than normalizing to the unit
		       cube, normalize to the viewport's screen
		       coordinates.  The resulting view-volume will be
		       bounded by the window's x,y screen coordinates,
		       and the z clip plane's world coordinates.
		       
	    These matrices are then multiplied together to obtain the final,
	    view-normalized perspective projection matrix "Nper."  Be sure 
	    to use the 4x4 matrix multiplication routine provided in "matrix.c" 
*/

compute_Nper(VUP,VPN,VRP,PRP,umin,umax,vmin,vmax,xmin,xmax,ymin,ymax,Nper)
float VUP[3],VRP[3],VPN[3],PRP[3];         /* the various viewing specifications */
float umin,umax,vmin,vmax;                 /* the window bounds in view coordinates */
float xmin,xmax,ymin,ymax;                 /* the window bounds in screen coordinates */
float Nper[4][4];                          /* the resulting perspective projection matrix */
{
}