---

zbf.h File Reference

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Z-buffer display module
Date: 08-Nov-2005 Author: Luiz F. Martha Version: 1.0 --------------------------------------------------------------- Reference: See class notes of courses CIV-2801 Fundamentos de Computacao Grafica Aplicada, Departamento de Engenharia Civil, PUC-Rio. --------------------------------------------------------------- Description: This header file contains public function specification and prototypes of the module to fill polygons in raster (image) coordinates using the z-buffer algorithm. --------------------------------------------------------------- Revisions: Created: 08-Nov-2005 Luiz Fernando Martha Stolen from g3dcdrnd.c and and modified.
int	zbfInit (int width, int height)
	This function initializes a zbuffer for displaying.
void	zbfClose (void)
	This function closes a zbuffer.
void	zbfBeginPoly (long int color)
	This function starts the display of a new polygon in this module.
void	zbfVertex (double x, double y, double z)
	This function receives a vertex of the current polygon being displayed in this module.
void	zbfEndPoly (void)
	This function finishes the specification of a polygon to be displayed in this module.

---

Function Documentation

void zbfBeginPoly (  long int    color )

This function starts the display of a new polygon in this module. The polygon is filled with the given color. Parameters: color  - coded color of polygon (in) Definition at line 470 of file zbf.c. References curr_color, npolyverts, and zbuff. Referenced by dspZbfBeginPoly().

void zbfClose (  void    )

This function closes a zbuffer. It releases the memory used by the current allocated zbuffer. Definition at line 461 of file zbf.c. References cv_height, cv_width, and zbfRelease().

void zbfEndPoly (  void    )

This function finishes the specification of a polygon to be displayed in this module. It displays the polygon using the z-buffer algorithm. Definition at line 502 of file zbf.c. References npolyverts, NscPnt::x, NscPnt::y, NscPnt::z, and zbfFillPoly(). Referenced by dspZbfEndPoly().

int zbfInit (  int    width, int    height )

This function initializes a zbuffer for displaying. It allocate memory for the zbuffer array and for local variables. Parameters: width, height  - sizes of new zbuffer (in) Definition at line 445 of file zbf.c. References cv_height, cv_width, zbfAlloc(), and zbuff. Referenced by prjZbufferSnapShot().

void zbfVertex (  double    x, double    y, double    z )

This function receives a vertex of the current polygon being displayed in this module. It is assumed that the vertex is given in normalized screen coordinates (NSC). The view volume in NSC ranges from -1 to +1 in the three axes. In NSC, the front (near) clipping plane has z = -1 and the back (far) clipping plane has z = +1. Parameters: x, y, z  - polygon vertex in normalized screen coords. (in) Definition at line 483 of file zbf.c. References npolyverts, sizepoly, and zbuff. Referenced by dspZbfVertex().

---