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/*
* zbuf_ext.h
* external interface for zbuf.h
*
* $Id$
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
*/
#ifndef ZBUF_H
#define ZBUF_H
#ifdef __cplusplus
extern "C" {
#endif
struct LampRen;
struct VlakRen;
/*-----------------------------------------------------------*/
/* Includes */
/*-----------------------------------------------------------*/
#include "zbuf_types.h"
#include "render_types.h"
#include "radio_types.h" /* for RadView */
/*-----------------------------------------------------------*/
/* Function */
/* (11 so far ) */
/*-----------------------------------------------------------*/
/**
* Fill a 'rectangle' with a fixed value. The rectangle contains x by
* y points. The rows are assumed to be contiguous in memory, and to
* consist of uints. This function is used for initializing the z
* buffer.
* (why is x int and y uint? called in envmap, render, zbuf)
* @param rect Pointer to the data representing the rectangle.
* @param x The width of the rectangle
* @param y The height of the rectangle
* @param val The value used to fill the rectangle.
*/
void fillrect(unsigned int *rect, int x, unsigned int y, unsigned int val);
/**
* Converts a world coordinate into a homogenous coordinate in view
* coordinates. The transformation matrix is only allowed to have a
* scaling and translation component.
* Also called in: shadbuf.c render.c radfactors.c
* initrender.c envmap.c editmesh.c
* @param v1 [3 floats] the world coordinate
* @param adr [4 floats] the homogenous view coordinate
*/
void projectvert(float *v1,float *adr);
/**
* Do a z buffer calculation pass for shadow calculations.
* Also called in: shadbuf.c
* Note: Uses globals.
* @param lar lamp definition data
*/
void zbuffershad(struct LampRen *lar);
/* to the external interface, temp, I hope... */
/**
* Tests whether the first three coordinates should be clipped
* wrt. the fourth component. Bits 1 and 2 test on x, 3 and 4 test on
* y, 5 and 6 test on z:
* xyz > test => set first bit (01),
* xyz < -test => set second bit (10),
* xyz == test => reset both bits (00).
* Note: functionality is duplicated from an internal function
* Also called in: initrender.c, radfactors.c
* @param v [4 floats] a coordinate
* @return a vector of bitfields
*/
/* int testclip(float *v); */
/* The following are only used in zbuf.c and render.c ---------------*/
/**
* Fills the entire in the alpha DA buffer. (All of it!)
* Note: Uses globals.
* Also called in: render.c
* @param y the line number to set
*/
void abufsetrow(int y);
/**
* Calculate the z buffer for all faces (or edges when in wireframe
* mode) presently visible.
* Note: Uses globals.
* Also called in: render.c
*/
void zbufferall(void);
/**
* Initialize accumulation buffers for alpha z buffering.
* The buffers are global variables. Also resets Accu buffer
* y bounds.
* <LI>
* <IT> Acolrow : colour buffer for one line
* <IT> Arectz : distance buffer for one line, depth ABUFPART
* <IT> APixbuf : pixel data buffer for one line, depth ABUFPART
* </LI>
* Also called in: render.c (should migrate)
* Note: Uses globals.
*/
void bgnaccumbuf(void);
/**
* Discard accumulation buffers for alpha z buffering.
* The buffers are global variables. The released buffers are Acolrow,
* Arectz, APixBuf.
* Also called in: render.c (should migrate)
* Note: Uses globals.
*/
void endaccumbuf(void);
/**
* Z face intersect?
*/
int vergzvlak(const void *x1, const void *x2);
/**
* Clip and fill vertex into the z buffer. zbuffunc needs to be set
* before entering, to assure that there is a buffer fill function
* that can be called. Zvlnr must be set to the current valid face
* index .
* Note: uses globals
* @param f1 [4 floats] vertex 1
* @param f2 [4 floats] vertex 2
* @param f3 [4 floats] vertex 3
* @param c1 clip conditions?
* @param c2
* @param c3
*/
void zbufclip(float *f1, float *f2, float *f3, int c1, int c2, int c3);
/**
* same, for edges
*/
void zbufclipwire(struct VlakRen *vlr);
#ifdef __cplusplus
}
#endif
#endif
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