// tgl_triangle_texmap.cpp

void ZB_fillTriangleMappingPerspective(ZBuffer *zb, ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint *p2)
{
    PIXEL *texture;
    float fdzdx,fndzdx,ndszdx,ndtzdx;

	unsigned short sh1 = zb->shift[0];
	unsigned short sh2 = zb->shift[1];
	unsigned int mask  = zb->uvmask;

#define INTERP_Z
#define INTERP_STZ

#define NB_INTERP 8

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

#if TGL_FEATURE_RENDER_BITS == 24

#define PUT_PIXEL(_a)				\
{						\
	unsigned char *ptr;\
	zz = z >> ZB_POINT_Z_FRAC_BITS;		\
	if ( ZCMP(zz,pz[_a]) )  \
	{				\
		ptr = texture + ((((t & mask)<<sh1) | (s & mask)) >> sh2) * 3;\
		pp[3 * _a]     = ptr[0];\
		pp[3 * _a + 1] = ptr[1];\
		pp[3 * _a + 2] = ptr[2];\
		pz[_a] = zz;				\
	}						\
	z += dzdx;					\
	s += dsdx;					\
	t += dtdx;					\
}

#else

#define PUT_PIXEL(_a)				\
{						\
	zz = z >> ZB_POINT_Z_FRAC_BITS;		\
	if ( ZCMP(zz,pz[_a]) ) \
	{				\
		pp[_a] = *(PIXEL *)((char *)texture+ \
			(( ((t & mask)<<sh1) | (s & mask) ) >> sh2)); \
		pz[_a] = zz;				\
	}						\
	z += dzdx;					\
	s += dsdx;					\
	t += dtdx;					\
}

#endif

#define DRAW_LINE()				\
{						\
  register unsigned short *pz;		\
  register PIXEL *pp;		\
  register unsigned int s,t,z,zz;	\
  register int n,dsdx,dtdx;		\
  float sz,tz,fz,zinv; \
  n=(x2>>16)-x1;                             \
  fz=(float)z1;\
  zinv=1.f / fz;\
  pp=(PIXEL *)((char *)pp1 + x1 * PSZB); \
  pz=pz1+x1;					\
  z=z1;						\
  sz=sz1;\
  tz=tz1;\
  while (n>=(NB_INTERP-1)) {						   \
    {\
      float ss,tt;\
      ss=(sz * zinv);\
      tt=(tz * zinv);\
      s=(int) ss;\
      t=(int) tt;\
      dsdx= (int)( (dszdx - ss*fdzdx)*zinv );\
      dtdx= (int)( (dtzdx - tt*fdzdx)*zinv );\
      fz+=fndzdx;\
      zinv=1.f / fz;\
    }\
    PUT_PIXEL(0);							   \
    PUT_PIXEL(1);							   \
    PUT_PIXEL(2);							   \
    PUT_PIXEL(3);							   \
    PUT_PIXEL(4);							   \
    PUT_PIXEL(5);							   \
    PUT_PIXEL(6);							   \
    PUT_PIXEL(7);							   \
    pz+=NB_INTERP;							   \
    pp=(PIXEL *)((char *)pp + NB_INTERP * PSZB);\
    n-=NB_INTERP;							   \
    sz+=ndszdx;\
    tz+=ndtzdx;\
  }									   \
    {\
      float ss,tt;\
      ss=(sz * zinv);\
      tt=(tz * zinv);\
      s=(int) ss;\
      t=(int) tt;\
      dsdx= (int)( (dszdx - ss*fdzdx)*zinv );\
      dtdx= (int)( (dtzdx - tt*fdzdx)*zinv );\
    }\
  while (n>=0) {							   \
    PUT_PIXEL(0);							   \
    pz+=1;								   \
    pp=(PIXEL *)((char *)pp + PSZB);\
    n-=1;								   \
  }									   \
}
  
#include "tgl_triangle_inc.h"
}