/*
================
R_Alias_clip_z
pfv0 is the unclipped vertex, pfv1 is the z-clipped vertex
================
*/
void R_Alias_clip_z (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out)
{
float scale;
auxvert_t *pav0, *pav1, avout;
pav0 = &av[pfv0 - &fv[0][0]];
pav1 = &av[pfv1 - &fv[0][0]];
if (pfv0->v[1] >= pfv1->v[1])
{
scale = (ALIAS_Z_CLIP_PLANE - pav0->fv[2]) /
(pav1->fv[2] - pav0->fv[2]);
avout.fv[0] = pav0->fv[0] + (pav1->fv[0] - pav0->fv[0]) * scale;
avout.fv[1] = pav0->fv[1] + (pav1->fv[1] - pav0->fv[1]) * scale;
avout.fv[2] = ALIAS_Z_CLIP_PLANE;
out->v[2] = pfv0->v[2] + (pfv1->v[2] - pfv0->v[2]) * scale;
out->v[3] = pfv0->v[3] + (pfv1->v[3] - pfv0->v[3]) * scale;
out->v[4] = pfv0->v[4] + (pfv1->v[4] - pfv0->v[4]) * scale;
}
else
{
scale = (ALIAS_Z_CLIP_PLANE - pav1->fv[2]) /
(pav0->fv[2] - pav1->fv[2]);
avout.fv[0] = pav1->fv[0] + (pav0->fv[0] - pav1->fv[0]) * scale;
avout.fv[1] = pav1->fv[1] + (pav0->fv[1] - pav1->fv[1]) * scale;
avout.fv[2] = ALIAS_Z_CLIP_PLANE;
out->v[2] = pfv1->v[2] + (pfv0->v[2] - pfv1->v[2]) * scale;
out->v[3] = pfv1->v[3] + (pfv0->v[3] - pfv1->v[3]) * scale;
out->v[4] = pfv1->v[4] + (pfv0->v[4] - pfv1->v[4]) * scale;
}
R_AliasProjectFinalVert (out, &avout);
if (out->v[0] < r_refdef.aliasvrect.x)
out->flags |= ALIAS_LEFT_CLIP;
if (out->v[1] < r_refdef.aliasvrect.y)
out->flags |= ALIAS_TOP_CLIP;
if (out->v[0] > r_refdef.aliasvrectright)
out->flags |= ALIAS_RIGHT_CLIP;
if (out->v[1] > r_refdef.aliasvrectbottom)
out->flags |= ALIAS_BOTTOM_CLIP;
}
void
R_AliasClipAndProjectFinalVert (finalvert_t *fv, auxvert_t *av)
{
if (av->fv[2] < ALIAS_Z_CLIP_PLANE) {
fv->flags |= ALIAS_Z_CLIP;
return;
}
R_AliasProjectFinalVert (fv, av);
if (fv->v[0] < r_refdef.aliasvrect.x)
fv->flags |= ALIAS_LEFT_CLIP;
if (fv->v[1] < r_refdef.aliasvrect.y)
fv->flags |= ALIAS_TOP_CLIP;
if (fv->v[0] > r_refdef.aliasvrectright)
fv->flags |= ALIAS_RIGHT_CLIP;
if (fv->v[1] > r_refdef.aliasvrectbottom)
fv->flags |= ALIAS_BOTTOM_CLIP;
}
/*
================
R_AliasPreparePoints
General clipped case
================
*/
void R_AliasPreparePoints(void)
{
int i;
stvert_t *pstverts;
finalvert_t *fv;
auxvert_t *av;
mtriangle_t *ptri;
finalvert_t *pfv[3];
pstverts = (stvert_t *)((byte *)paliashdr + paliashdr->stverts);
r_anumverts = pmdl->numverts;
fv = pfinalverts;
av = pauxverts;
for (i=0 ; i<r_anumverts ; i++, fv++, av++, r_apverts++, pstverts++)
{
R_AliasTransformFinalVert(fv, av, r_apverts, pstverts);
if (av->fv[2] < ALIAS_Z_CLIP_PLANE)
{
fv->flags |= ALIAS_Z_CLIP;
}
else
{
R_AliasProjectFinalVert(fv, av);
if (fv->v[0] < r_refdef.aliasvrect.x)
{
fv->flags |= ALIAS_LEFT_CLIP;
}
if (fv->v[1] < r_refdef.aliasvrect.y)
{
fv->flags |= ALIAS_TOP_CLIP;
}
if (fv->v[0] > r_refdef.aliasvrectright)
{
fv->flags |= ALIAS_RIGHT_CLIP;
}
if (fv->v[1] > r_refdef.aliasvrectbottom)
{
fv->flags |= ALIAS_BOTTOM_CLIP;
}
}
}
//
// clip and draw all triangles
//
r_affinetridesc.numtriangles = 1;
ptri = (mtriangle_t *)((byte *)paliashdr + paliashdr->triangles);
for (i=0 ; i<pmdl->numtris ; i++, ptri++)
{
pfv[0] = &pfinalverts[ptri->vertindex[0]];
pfv[1] = &pfinalverts[ptri->vertindex[1]];
pfv[2] = &pfinalverts[ptri->vertindex[2]];
if (pfv[0]->flags & pfv[1]->flags & pfv[2]->flags & (ALIAS_XY_CLIP_MASK | ALIAS_Z_CLIP))
{
continue; // completely clipped
}
if (!((pfv[0]->flags | pfv[1]->flags | pfv[2]->flags) &
(ALIAS_XY_CLIP_MASK | ALIAS_Z_CLIP)))
{
// totally unclipped
r_affinetridesc.pfinalverts = pfinalverts;
r_affinetridesc.ptriangles = ptri;
D_PolysetDraw();
}
else
{
// partially clipped
R_AliasClipTriangle(ptri);
}
}
}
/*
================
R_AliasPreparePoints
General clipped case
================
*/
static void R_AliasPreparePoints (void)
{
int i;
stvert_t *pstverts;
finalvert_t *fv;
auxvert_t *av;
mtriangle_t *ptri;
finalvert_t *pfv[3];
pstverts = (stvert_t *)((byte *)paliashdr + paliashdr->stverts);
r_anumverts = pmdl->numverts;
fv = pfinalverts;
av = pauxverts;
for (i = 0 ; i < r_anumverts ; i++, fv++, av++, r_apverts++)
{
fv->flags = 0;
R_AliasTransformFinalVert (fv, av, r_apverts);
if (av->fv[2] < ALIAS_Z_CLIP_PLANE)
fv->flags |= ALIAS_Z_CLIP;
else
{
R_AliasProjectFinalVert (fv, av);
if (fv->v[0] < r_refdef.aliasvrect.x)
fv->flags |= ALIAS_LEFT_CLIP;
if (fv->v[1] < r_refdef.aliasvrect.y)
fv->flags |= ALIAS_TOP_CLIP;
if (fv->v[0] > r_refdef.aliasvrectright)
fv->flags |= ALIAS_RIGHT_CLIP;
if (fv->v[1] > r_refdef.aliasvrectbottom)
fv->flags |= ALIAS_BOTTOM_CLIP;
}
}
//
// clip and draw all triangles
//
r_affinetridesc.numtriangles = 1;
ptri = (mtriangle_t *)((byte *)paliashdr + paliashdr->triangles);
for (i = 0 ; i < pmdl->numtris ; i++, ptri++)
{
pfv[0] = &pfinalverts[ptri->vertindex[0]];
pfv[1] = &pfinalverts[ptri->vertindex[1]];
pfv[2] = &pfinalverts[ptri->vertindex[2]];
if ( pfv[0]->flags & pfv[1]->flags & pfv[2]->flags & (ALIAS_XY_CLIP_MASK | ALIAS_Z_CLIP) )
continue; // completely clipped
//jfm: fill in the triangles s and t into the finalvert
pfv[0]->v[2] = pstverts[ptri->stindex[0]].s;
pfv[0]->v[3] = pstverts[ptri->stindex[0]].t;
pfv[0]->flags |= pstverts[ptri->stindex[0]].onseam;
pfv[1]->v[2] = pstverts[ptri->stindex[1]].s;
pfv[1]->v[3] = pstverts[ptri->stindex[1]].t;
pfv[1]->flags |= pstverts[ptri->stindex[1]].onseam;
pfv[2]->v[2] = pstverts[ptri->stindex[2]].s;
pfv[2]->v[3] = pstverts[ptri->stindex[2]].t;
pfv[2]->flags |= pstverts[ptri->stindex[2]].onseam;
if ( ! ( (pfv[0]->flags | pfv[1]->flags | pfv[2]->flags) & (ALIAS_XY_CLIP_MASK | ALIAS_Z_CLIP) ) )
{ // totally unclipped
r_affinetridesc.pfinalverts = pfinalverts;
r_affinetridesc.ptriangles = ptri;
if ((currententity->model->flags & EF_SPECIAL_TRANS))
D_PolysetDrawT5 ();
else if (currententity->drawflags & DRF_TRANSLUCENT)
D_PolysetDrawT ();
else if ((currententity->model->flags & EF_TRANSPARENT))
D_PolysetDrawT2 ();
else if ((currententity->model->flags & EF_HOLEY))
D_PolysetDrawT3 ();
else
D_PolysetDraw ();
}
else
{ // partially clipped
R_AliasClipTriangle (ptri);
}
}
}