ztriangle.c File Reference

#include <stdlib.h>
#include "zbuffer.h"
#include "ztriangle.h"

Go to the source code of this file.

Macros
#define	ZCMP(z, zpix)   ((z) >= (zpix))
#define	INTERP_Z
#define	DRAW_INIT()
#define	PUT_PIXEL(_a)
#define	INTERP_Z
#define	INTERP_RGB
#define	SAR_RND_TO_ZERO(v, n)   (v / (1<<n))
#define	DRAW_INIT()
#define	PUT_PIXEL(_a)
#define	DRAW_LINE()
#define	INTERP_Z
#define	INTERP_ST
#define	DRAW_INIT()
#define	PUT_PIXEL(_a)
#define	INTERP_Z
#define	INTERP_STZ
#define	NB_INTERP   8
#define	DRAW_INIT()
#define	PUT_PIXEL(_a)
#define	DRAW_LINE()

Functions
void	ZB_fillTriangleFlat (ZBuffer *zb, ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint *p2)
void	ZB_fillTriangleSmooth (ZBuffer *zb, ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint *p2)
void	ZB_setTexture (ZBuffer *zb, PIXEL *texture)
void	ZB_fillTriangleMapping (ZBuffer *zb, ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint *p2)
void	ZB_fillTriangleMappingPerspective (ZBuffer *zb, ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint *p2)

Macro Definition Documentation

DRAW_INIT [1/4]

#define DRAW_INIT

(

)

Value:

{                       \
  color=RGB_TO_PIXEL(p2->r,p2->g,p2->b);    \
}

DRAW_INIT [2/4]

#define DRAW_INIT

(

)

Value:

{                       \
  _drgbdx=(SAR_RND_TO_ZERO(drdx,6) << 22) & 0xFFC00000;     \
  _drgbdx|=SAR_RND_TO_ZERO(dgdx,5) & 0x000007FF;        \
  _drgbdx|=(SAR_RND_TO_ZERO(dbdx,7) << 12) & 0x001FF000;    \
}

DRAW_INIT [3/4]

#define DRAW_INIT

(

)

Value:

{                       \
  texture=zb->current_texture;          \
}

DRAW_INIT [4/4]

#define DRAW_INIT

(

)

Value:

{                       \
  texture=zb->current_texture;\
  fdzdx=(float)dzdx;\
  fndzdx=NB_INTERP * fdzdx;\
  ndszdx=NB_INTERP * dszdx;\
  ndtzdx=NB_INTERP * dtzdx;\
}

DRAW_LINE [1/2]

#define DRAW_LINE

(

)

Value:

{                                      \
  register unsigned short *pz;                     \
  register PIXEL *pp;                      \
  register unsigned int tmp,z,zz,rgb,drgbdx;                   \
  register int n;                              \
  n=(x2 >> 16) - x1;                               \
  pp=pp1+x1;                                   \
  pz=pz1+x1;                                   \
  z=z1;                                    \
  rgb=(r1 << 16) & 0xFFC00000;                         \
  rgb|=(g1 >> 5) & 0x000007FF;                         \
  rgb|=(b1 << 5) & 0x001FF000;                         \
  drgbdx=_drgbdx;                              \
  while (n>=3) {                               \
    PUT_PIXEL(0);                              \
    PUT_PIXEL(1);                              \
    PUT_PIXEL(2);                              \
    PUT_PIXEL(3);                              \
    pz+=4;                                 \
    pp+=4;                                 \
    n-=4;                                  \
  }                                    \
  while (n>=0) {                               \
    PUT_PIXEL(0);                              \
    pz+=1;                                 \
    pp+=1;                                 \
    n-=1;                                  \
  }                                    \
}

DRAW_LINE [2/2]

#define DRAW_LINE

(

)

INTERP_RGB

#define INTERP_RGB

INTERP_ST

#define INTERP_ST

INTERP_STZ

#define INTERP_STZ

INTERP_Z [1/4]

#define INTERP_Z

INTERP_Z [2/4]

#define INTERP_Z

INTERP_Z [3/4]

#define INTERP_Z

INTERP_Z [4/4]

#define INTERP_Z

NB_INTERP

#define NB_INTERP   8

PUT_PIXEL [1/4]

#define PUT_PIXEL

(

_a

)

Value:

{                       \
    zz=z >> ZB_POINT_Z_FRAC_BITS;       \
    if (ZCMP(zz,pz[_a])) {              \
      pp[_a]=color;             \
      pz[_a]=zz;                \
    }                       \
    z+=dzdx;                    \
}

PUT_PIXEL [2/4]

#define PUT_PIXEL

(

_a

)

Value:

{                       \
    zz=z >> ZB_POINT_Z_FRAC_BITS;       \
    if (ZCMP(zz,pz[_a])) {              \
      tmp=rgb & 0xF81F07E0;         \
      pp[_a]=tmp | (tmp >> 16);         \
      pz[_a]=zz;                \
    }                       \
    z+=dzdx;                    \
    rgb=(rgb+drgbdx) & ( ~ 0x00200800);     \
}

PUT_PIXEL [3/4]

#define PUT_PIXEL

(

_a

)

Value:

{                       \
   zz=z >> ZB_POINT_Z_FRAC_BITS;        \
     if (ZCMP(zz,pz[_a])) {             \
       pp[_a]=texture[((t & 0x3FC00000) | s) >> 14];    \
       pz[_a]=zz;               \
    }                       \
    z+=dzdx;                    \
    s+=dsdx;                    \
    t+=dtdx;                    \
}

PUT_PIXEL [4/4]

#define PUT_PIXEL

(

_a

)

Value:

{                       \
   zz=z >> ZB_POINT_Z_FRAC_BITS;        \
     if (ZCMP(zz,pz[_a])) {             \
       pp[_a]=*(PIXEL *)((char *)texture+ \
               (((t & 0x3FC00000) | (s & 0x003FC000)) >> (17 - PSZSH)));\
       pz[_a]=zz;               \
    }                       \
    z+=dzdx;                    \
    s+=dsdx;                    \
    t+=dtdx;                    \
}

SAR_RND_TO_ZERO

#define SAR_RND_TO_ZERO	(		v,
			n
	)		(v / (1<<n))

ZCMP

#define ZCMP	(		z,
			zpix
	)		((z) >= (zpix))

Definition at line 4 of file ztriangle.c.

Function Documentation

ZB_fillTriangleFlat()

void ZB_fillTriangleFlat	(	ZBuffer *	zb,
		ZBufferPoint *	p0,
		ZBufferPoint *	p1,
		ZBufferPoint *	p2
	)

Definition at line 6 of file ztriangle.c.

ZB_fillTriangleMapping()

void ZB_fillTriangleMapping	(	ZBuffer *	zb,
		ZBufferPoint *	p0,
		ZBufferPoint *	p1,
		ZBufferPoint *	p2
	)

Definition at line 179 of file ztriangle.c.

ZB_fillTriangleMappingPerspective()

void ZB_fillTriangleMappingPerspective	(	ZBuffer *	zb,
		ZBufferPoint *	p0,
		ZBufferPoint *	p1,
		ZBufferPoint *	p2
	)

Definition at line 236 of file ztriangle.c.

ZB_fillTriangleSmooth()

void ZB_fillTriangleSmooth	(	ZBuffer *	zb,
		ZBufferPoint *	p0,
		ZBufferPoint *	p1,
		ZBufferPoint *	p2
	)

Definition at line 64 of file ztriangle.c.

ZB_setTexture()

void ZB_setTexture	(	ZBuffer *	zb,
		PIXEL *	texture
	)

Definition at line 174 of file ztriangle.c.