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ztriangle.h
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502 lines (448 loc) · 11 KB
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/*
* We draw a triangle with various interpolations
*/
{
ZBufferPoint *t,*pr1,*pr2,*l1,*l2;
PN_stdfloat fdx1, fdx2, fdy1, fdy2, fz, d1, d2;
ZPOINT *pz1;
PIXEL *pp1;
int part, update_left, update_right;
int nb_lines, dx1, dy1, tmp, dx2, dy2;
int error, derror;
int x1, dxdy_min, dxdy_max;
/* warning: x2 is multiplied by 2^16 */
int x2, dx2dy2;
#ifdef INTERP_Z
int z1 = 0, dzdx = 0, dzdy = 0, dzdl_min = 0, dzdl_max = 0;
#endif
#ifdef INTERP_RGB
int r1 = 0, drdx = 0, drdy = 0, drdl_min = 0, drdl_max = 0;
int g1 = 0, dgdx = 0, dgdy = 0, dgdl_min = 0, dgdl_max = 0;
int b1 = 0, dbdx = 0, dbdy = 0, dbdl_min = 0, dbdl_max = 0;
int a1 = 0, dadx = 0, dady = 0, dadl_min = 0, dadl_max = 0;
#endif
#ifdef INTERP_ST
int s1 = 0, dsdx = 0, dsdy = 0, dsdl_min = 0, dsdl_max = 0;
int t1 = 0, dtdx = 0, dtdy = 0, dtdl_min = 0, dtdl_max = 0;
#endif
#ifdef INTERP_STZ
PN_stdfloat sz1 = 0, dszdx = 0, dszdy = 0, dszdl_min = 0, dszdl_max = 0;
PN_stdfloat tz1 = 0, dtzdx = 0, dtzdy = 0, dtzdl_min = 0, dtzdl_max = 0;
#endif
#ifdef INTERP_STZA
PN_stdfloat sza1 = 0, dszadx = 0, dszady = 0, dszadl_min = 0, dszadl_max = 0;
PN_stdfloat tza1 = 0, dtzadx = 0, dtzady = 0, dtzadl_min = 0, dtzadl_max = 0;
#endif
#ifdef INTERP_STZB
PN_stdfloat szb1 = 0, dszbdx = 0, dszbdy = 0, dszbdl_min = 0, dszbdl_max = 0;
PN_stdfloat tzb1 = 0, dtzbdx = 0, dtzbdy = 0, dtzbdl_min = 0, dtzbdl_max = 0;
#endif
#if defined(INTERP_MIPMAP) && (defined(INTERP_ST) || defined(INTERP_STZ))
unsigned int mipmap_dx = 0, mipmap_level = 0;
#endif
#if defined(INTERP_MIPMAP) && defined(INTERP_STZA)
unsigned int mipmap_dxa = 0, mipmap_levela = 0;
#endif
#if defined(INTERP_MIPMAP) && defined(INTERP_STZB)
unsigned int mipmap_dxb = 0, mipmap_levelb = 0;
#endif
EARLY_OUT();
COUNT_PIXELS(PIXEL_COUNT, p0, p1, p2);
/* we sort the vertex with increasing y */
if (p1->y < p0->y) {
t = p0;
p0 = p1;
p1 = t;
}
if (p2->y < p0->y) {
t = p2;
p2 = p1;
p1 = p0;
p0 = t;
} else if (p2->y < p1->y) {
t = p1;
p1 = p2;
p2 = t;
}
/* we compute dXdx and dXdy for all interpolated values */
fdx1 = (PN_stdfloat) (p1->x - p0->x);
fdy1 = (PN_stdfloat) (p1->y - p0->y);
fdx2 = (PN_stdfloat) (p2->x - p0->x);
fdy2 = (PN_stdfloat) (p2->y - p0->y);
fz = fdx1 * fdy2 - fdx2 * fdy1;
if (fz == 0)
return;
fz = 1.0f / fz;
fdx1 *= fz;
fdy1 *= fz;
fdx2 *= fz;
fdy2 *= fz;
#ifdef INTERP_Z
d1 = (PN_stdfloat) (p1->z - p0->z);
d2 = (PN_stdfloat) (p2->z - p0->z);
dzdx = (int) (fdy2 * d1 - fdy1 * d2);
dzdy = (int) (fdx1 * d2 - fdx2 * d1);
#endif
#ifdef INTERP_RGB
d1 = (PN_stdfloat) (p1->r - p0->r);
d2 = (PN_stdfloat) (p2->r - p0->r);
drdx = (int) (fdy2 * d1 - fdy1 * d2);
drdy = (int) (fdx1 * d2 - fdx2 * d1);
d1 = (PN_stdfloat) (p1->g - p0->g);
d2 = (PN_stdfloat) (p2->g - p0->g);
dgdx = (int) (fdy2 * d1 - fdy1 * d2);
dgdy = (int) (fdx1 * d2 - fdx2 * d1);
d1 = (PN_stdfloat) (p1->b - p0->b);
d2 = (PN_stdfloat) (p2->b - p0->b);
dbdx = (int) (fdy2 * d1 - fdy1 * d2);
dbdy = (int) (fdx1 * d2 - fdx2 * d1);
d1 = (PN_stdfloat) (p1->a - p0->a);
d2 = (PN_stdfloat) (p2->a - p0->a);
dadx = (int) (fdy2 * d1 - fdy1 * d2);
dady = (int) (fdx1 * d2 - fdx2 * d1);
#endif
#ifdef INTERP_ST
d1 = (PN_stdfloat) (p1->s - p0->s);
d2 = (PN_stdfloat) (p2->s - p0->s);
dsdx = (int) (fdy2 * d1 - fdy1 * d2);
dsdy = (int) (fdx1 * d2 - fdx2 * d1);
d1 = (PN_stdfloat) (p1->t - p0->t);
d2 = (PN_stdfloat) (p2->t - p0->t);
dtdx = (int) (fdy2 * d1 - fdy1 * d2);
dtdy = (int) (fdx1 * d2 - fdx2 * d1);
CALC_MIPMAP_LEVEL(mipmap_level, mipmap_dx, dsdx, dtdx);
#endif
#ifdef INTERP_STZ
{
PN_stdfloat zz;
zz=(PN_stdfloat) p0->z;
p0->sz= (PN_stdfloat) p0->s * zz;
p0->tz= (PN_stdfloat) p0->t * zz;
zz=(PN_stdfloat) p1->z;
p1->sz= (PN_stdfloat) p1->s * zz;
p1->tz= (PN_stdfloat) p1->t * zz;
zz=(PN_stdfloat) p2->z;
p2->sz= (PN_stdfloat) p2->s * zz;
p2->tz= (PN_stdfloat) p2->t * zz;
d1 = p1->sz - p0->sz;
d2 = p2->sz - p0->sz;
dszdx = (fdy2 * d1 - fdy1 * d2);
dszdy = (fdx1 * d2 - fdx2 * d1);
d1 = p1->tz - p0->tz;
d2 = p2->tz - p0->tz;
dtzdx = (fdy2 * d1 - fdy1 * d2);
dtzdy = (fdx1 * d2 - fdx2 * d1);
}
#endif
#ifdef INTERP_STZA
{
PN_stdfloat zz;
zz=(PN_stdfloat) p0->z;
p0->sza= (PN_stdfloat) p0->sa * zz;
p0->tza= (PN_stdfloat) p0->ta * zz;
zz=(PN_stdfloat) p1->z;
p1->sza= (PN_stdfloat) p1->sa * zz;
p1->tza= (PN_stdfloat) p1->ta * zz;
zz=(PN_stdfloat) p2->z;
p2->sza= (PN_stdfloat) p2->sa * zz;
p2->tza= (PN_stdfloat) p2->ta * zz;
d1 = p1->sza - p0->sza;
d2 = p2->sza - p0->sza;
dszadx = (fdy2 * d1 - fdy1 * d2);
dszady = (fdx1 * d2 - fdx2 * d1);
d1 = p1->tza - p0->tza;
d2 = p2->tza - p0->tza;
dtzadx = (fdy2 * d1 - fdy1 * d2);
dtzady = (fdx1 * d2 - fdx2 * d1);
}
#endif
#ifdef INTERP_STZB
{
PN_stdfloat zz;
zz=(PN_stdfloat) p0->z;
p0->szb= (PN_stdfloat) p0->sb * zz;
p0->tzb= (PN_stdfloat) p0->tb * zz;
zz=(PN_stdfloat) p1->z;
p1->szb= (PN_stdfloat) p1->sb * zz;
p1->tzb= (PN_stdfloat) p1->tb * zz;
zz=(PN_stdfloat) p2->z;
p2->szb= (PN_stdfloat) p2->sb * zz;
p2->tzb= (PN_stdfloat) p2->tb * zz;
d1 = p1->szb - p0->szb;
d2 = p2->szb - p0->szb;
dszbdx = (fdy2 * d1 - fdy1 * d2);
dszbdy = (fdx1 * d2 - fdx2 * d1);
d1 = p1->tzb - p0->tzb;
d2 = p2->tzb - p0->tzb;
dtzbdx = (fdy2 * d1 - fdy1 * d2);
dtzbdy = (fdx1 * d2 - fdx2 * d1);
}
#endif
/* screen coordinates */
pp1 = (PIXEL *) ((char *) zb->pbuf + zb->linesize * p0->y);
pz1 = zb->zbuf + p0->y * zb->xsize;
DRAW_INIT();
for(part=0;part<2;part++) {
if (part == 0) {
if (fz > 0) {
update_left=1;
update_right=1;
l1=p0;
l2=p2;
pr1=p0;
pr2=p1;
} else {
update_left=1;
update_right=1;
l1=p0;
l2=p1;
pr1=p0;
pr2=p2;
}
nb_lines = p1->y - p0->y;
} else {
/* second part */
if (fz > 0) {
update_left=0;
update_right=1;
pr1=p1;
pr2=p2;
} else {
update_left=1;
update_right=0;
l1=p1;
l2=p2;
}
nb_lines = p2->y - p1->y + 1;
}
/* compute the values for the left edge */
if (update_left) {
dy1 = l2->y - l1->y;
dx1 = l2->x - l1->x;
if (dy1 > 0)
tmp = (dx1 << 16) / dy1;
else
tmp = 0;
x1 = l1->x;
error = 0;
derror = tmp & 0x0000ffff;
dxdy_min = tmp >> 16;
dxdy_max = dxdy_min + 1;
#ifdef INTERP_Z
z1=l1->z;
dzdl_min=(dzdy + dzdx * dxdy_min);
dzdl_max=dzdl_min + dzdx;
#endif
#ifdef INTERP_RGB
r1=l1->r;
drdl_min=(drdy + drdx * dxdy_min);
drdl_max=drdl_min + drdx;
g1=l1->g;
dgdl_min=(dgdy + dgdx * dxdy_min);
dgdl_max=dgdl_min + dgdx;
b1=l1->b;
dbdl_min=(dbdy + dbdx * dxdy_min);
dbdl_max=dbdl_min + dbdx;
a1=l1->a;
dadl_min=(dady + dadx * dxdy_min);
dadl_max=dadl_min + dadx;
#endif
#ifdef INTERP_ST
s1=l1->s;
dsdl_min=(dsdy + dsdx * dxdy_min);
dsdl_max=dsdl_min + dsdx;
t1=l1->t;
dtdl_min=(dtdy + dtdx * dxdy_min);
dtdl_max=dtdl_min + dtdx;
#endif
#ifdef INTERP_STZ
sz1=l1->sz;
dszdl_min=(dszdy + dszdx * dxdy_min);
dszdl_max=dszdl_min + dszdx;
tz1=l1->tz;
dtzdl_min=(dtzdy + dtzdx * dxdy_min);
dtzdl_max=dtzdl_min + dtzdx;
#endif
#ifdef INTERP_STZA
sza1=l1->sza;
dszadl_min=(dszady + dszadx * dxdy_min);
dszadl_max=dszadl_min + dszadx;
tza1=l1->tza;
dtzadl_min=(dtzady + dtzadx * dxdy_min);
dtzadl_max=dtzadl_min + dtzadx;
#endif
#ifdef INTERP_STZB
szb1=l1->szb;
dszbdl_min=(dszbdy + dszbdx * dxdy_min);
dszbdl_max=dszbdl_min + dszbdx;
tzb1=l1->tzb;
dtzbdl_min=(dtzbdy + dtzbdx * dxdy_min);
dtzbdl_max=dtzbdl_min + dtzbdx;
#endif
}
/* compute values for the right edge */
if (update_right) {
dx2 = (pr2->x - pr1->x);
dy2 = (pr2->y - pr1->y);
if (dy2>0)
dx2dy2 = ( dx2 << 16) / dy2;
else
dx2dy2 = 0;
x2 = pr1->x << 16;
}
/* we draw all the scan line of the part */
while (nb_lines>0) {
nb_lines--;
#ifndef DRAW_LINE
/* generic draw line */
{
PIXEL *pp;
int n;
#ifdef INTERP_Z
ZPOINT *pz;
unsigned int z,zz;
#endif
#ifdef INTERP_RGB
unsigned int or1,og1,ob1,oa1;
#endif
#ifdef INTERP_ST
unsigned int s,t;
#endif
#ifdef INTERP_STZ
PN_stdfloat sz,tz;
#endif
#ifdef INTERP_STZA
PN_stdfloat sza,tza;
#endif
#ifdef INTERP_STZB
PN_stdfloat szb,tzb;
#endif
n=(x2 >> 16) - x1;
pp=(PIXEL *)((char *)pp1 + x1 * PSZB);
#ifdef INTERP_Z
pz=pz1+x1;
z=z1;
#endif
#ifdef INTERP_RGB
or1 = r1;
og1 = g1;
ob1 = b1;
oa1 = a1;
#endif
#ifdef INTERP_ST
s=s1;
t=t1;
#endif
#ifdef INTERP_STZ
sz=sz1;
tz=tz1;
#endif
#ifdef INTERP_STZA
sza=sza1;
tza=tza1;
#endif
#ifdef INTERP_STZB
szb=szb1;
tzb=tzb1;
#endif
while (n>=3) {
PUT_PIXEL(0);
PUT_PIXEL(1);
PUT_PIXEL(2);
PUT_PIXEL(3);
#ifdef INTERP_Z
pz+=4;
#endif
pp=(PIXEL *)((char *)pp + 4 * PSZB);
n-=4;
}
while (n>=0) {
PUT_PIXEL(0);
#ifdef INTERP_Z
pz+=1;
#endif
pp=(PIXEL *)((char *)pp + PSZB);
n-=1;
}
}
#else
DRAW_LINE();
#endif
/* left edge */
error+=derror;
if (error > 0) {
error-=0x10000;
x1+=dxdy_max;
#ifdef INTERP_Z
z1+=dzdl_max;
#endif
#ifdef INTERP_RGB
r1+=drdl_max;
g1+=dgdl_max;
b1+=dbdl_max;
a1+=dadl_max;
#endif
#ifdef INTERP_ST
s1+=dsdl_max;
t1+=dtdl_max;
#endif
#ifdef INTERP_STZ
sz1+=dszdl_max;
tz1+=dtzdl_max;
#endif
#ifdef INTERP_STZA
sza1+=dszadl_max;
tza1+=dtzadl_max;
#endif
#ifdef INTERP_STZB
szb1+=dszbdl_max;
tzb1+=dtzbdl_max;
#endif
} else {
x1+=dxdy_min;
#ifdef INTERP_Z
z1+=dzdl_min;
#endif
#ifdef INTERP_RGB
r1+=drdl_min;
g1+=dgdl_min;
b1+=dbdl_min;
a1+=dadl_min;
#endif
#ifdef INTERP_ST
s1+=dsdl_min;
t1+=dtdl_min;
#endif
#ifdef INTERP_STZ
sz1+=dszdl_min;
tz1+=dtzdl_min;
#endif
#ifdef INTERP_STZA
sza1+=dszadl_min;
tza1+=dtzadl_min;
#endif
#ifdef INTERP_STZB
szb1+=dszbdl_min;
tzb1+=dtzbdl_min;
#endif
}
/* right edge */
x2+=dx2dy2;
/* screen coordinates */
pp1=(PIXEL *)((char *)pp1 + zb->linesize);
pz1+=zb->xsize;
}
}
}
#undef INTERP_Z
#undef INTERP_RGB
#undef INTERP_ST
#undef INTERP_STZ
#undef INTERP_STZA
#undef INTERP_STZB
#undef EARLY_OUT
#undef EARLY_OUT_FZ
#undef DRAW_INIT
#undef DRAW_LINE
#undef PUT_PIXEL
#undef PIXEL_COUNT