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/*	perspect.h - matrix algebra definitions
 *	Copyright (C) 1993 Corona Design, Inc. All rights reserved.
 *
 *	Abstract
 *		Common 3D perspective transformations. Provides an arbitrary
 *		view plane with a center of perspective 1 unit (in VIEW space)
 *		from the view plane.
 *
 *		Reference: Foley & van Dam, Computer Graphics
 *		C callable.
 *
 *	RCS path: 
 *		$Source: /Users/pkron/Projects/voxel/Pyramid/matrix.subproj/RCS/perspect.h,v $
 *	Modified: $Date: 93/09/15 12:34:04 $ by $Author: pkron $
 *	Current State: $State: Exp $ locked by $Locker:  $
 */
 
#ifndef	_PERSPECT_H
#define	_PERSPECT_H

#include	"standard.h"

typedef	struct _matrix	*MATRIX;
typedef float			POINT[4];

							// allocate an identity matrix
EXTERN_C	MATRIX		allocIdentity();

							// free an allocated matrix
EXTERN_C	void		freeMatrix( MATRIX matrix);

							// map a point in a given transform
EXTERN_C	void		map( MATRIX matrix, POINT *aPoint);

							// orient the view space
							// normal and up define vectors in world space
							//     from (0,0,0) to the specified point
							// normal defines the z-axis of the view space
							// 		(normal to the view plane)
							// up defines a vector which will project onto
							//		the positive y-axis of the view plane
EXTERN_C	void		orient( MATRIX matrix, POINT *normal, POINT *up);

							// project a mapped point onto the view
							// plane
EXTERN_C	void		project( POINT *aPoint);

							// concatenate transform with projection 
							// into viewplane
EXTERN_C	void		scaleProjection( 
								MATRIX transform, 
								int width, int height
								);

							// translate the origin to a point in VIEW space
EXTERN_C	void		translate( 	MATRIX matrix, POINT *to);

							// set the distance from the Center Of Perspective
							// to the VIEW space origin.
EXTERN_C	void		viewDistance( MATRIX matrix, float distance);

#endif	// PERSPECT_H

#ifdef	_LOG
/*
 *	$Log:	perspect.h,v $
 * Revision 1.1  93/09/15  12:34:04  pkron
 * Created
 * 
 */
#endif		

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