/*
================
R_RenderFace
================
*/
void R_RenderFace(msurface_t * fa, int clipflags)
{
int i, lindex;
unsigned mask;
mplane_t *pplane;
float distinv;
vec3_t p_normal;
medge_t *pedges, tedge;
clipplane_t *pclip;
// skip out if no more surfs
if ((surface_p) >= surf_max) {
r_outofsurfaces++;
return;
}
// ditto if not enough edges left, or switch to auxedges if possible
if ((edge_p + fa->numedges + 4) >= edge_max) {
r_outofedges += fa->numedges;
return;
}
c_faceclip++;
// set up clip planes
pclip = NULL;
for (i = 3, mask = 0x08; i >= 0; i--, mask >>= 1) {
if (clipflags & mask) {
view_clipplanes[i].next = pclip;
pclip = &view_clipplanes[i];
}
}
// push the edges through
r_emitted = 0;
r_nearzi = 0;
r_nearzionly = false;
makeleftedge = makerightedge = false;
pedges = currententity->model->edges;
r_lastvertvalid = false;
for (i = 0; i < fa->numedges; i++) {
lindex = currententity->model->surfedges[fa->firstedge + i];
if (lindex > 0) {
r_pedge = &pedges[lindex];
// if the edge is cached, we can just reuse the edge
if (!insubmodel) {
if (r_pedge->cachededgeoffset & FULLY_CLIPPED_CACHED) {
if ((r_pedge->cachededgeoffset & FRAMECOUNT_MASK) ==
r_framecount) {
r_lastvertvalid = false;
continue;
}
} else {
if ((((unsigned long) edge_p -
(unsigned long) r_edges) >
r_pedge->cachededgeoffset)
&&
(((edge_t *) ((unsigned long) r_edges +
r_pedge->cachededgeoffset))->owner ==
r_pedge)) {
R_EmitCachedEdge();
r_lastvertvalid = false;
continue;
}
}
}
// assume it's cacheable
cacheoffset = (byte *) edge_p - (byte *) r_edges;
r_leftclipped = r_rightclipped = false;
R_ClipEdge(&r_pcurrentvertbase[r_pedge->v[0]],
&r_pcurrentvertbase[r_pedge->v[1]], pclip);
r_pedge->cachededgeoffset = cacheoffset;
if (r_leftclipped)
makeleftedge = true;
if (r_rightclipped)
makerightedge = true;
r_lastvertvalid = true;
} else {
lindex = -lindex;
r_pedge = &pedges[lindex];
// if the edge is cached, we can just reuse the edge
if (!insubmodel) {
if (r_pedge->cachededgeoffset & FULLY_CLIPPED_CACHED) {
if ((r_pedge->cachededgeoffset & FRAMECOUNT_MASK) ==
r_framecount) {
r_lastvertvalid = false;
continue;
}
} else {
// it's cached if the cached edge is valid and is owned
// by this medge_t
if ((((unsigned long) edge_p -
(unsigned long) r_edges) >
r_pedge->cachededgeoffset)
&&
(((edge_t *) ((unsigned long) r_edges +
r_pedge->cachededgeoffset))->owner ==
r_pedge)) {
R_EmitCachedEdge();
r_lastvertvalid = false;
continue;
}
}
}
// assume it's cacheable
cacheoffset = (byte *) edge_p - (byte *) r_edges;
r_leftclipped = r_rightclipped = false;
R_ClipEdge(&r_pcurrentvertbase[r_pedge->v[1]],
&r_pcurrentvertbase[r_pedge->v[0]], pclip);
r_pedge->cachededgeoffset = cacheoffset;
if (r_leftclipped)
makeleftedge = true;
if (r_rightclipped)
makerightedge = true;
r_lastvertvalid = true;
}
}
// if there was a clip off the left edge, add that edge too
// FIXME: faster to do in screen space?
// FIXME: share clipped edges?
if (makeleftedge) {
r_pedge = &tedge;
r_lastvertvalid = false;
R_ClipEdge(&r_leftexit, &r_leftenter, pclip->next);
}
// if there was a clip off the right edge, get the right r_nearzi
if (makerightedge) {
r_pedge = &tedge;
r_lastvertvalid = false;
r_nearzionly = true;
R_ClipEdge(&r_rightexit, &r_rightenter, view_clipplanes[1].next);
}
// if no edges made it out, return without posting the surface
if (!r_emitted)
return;
r_polycount++;
surface_p->data = (void *) fa;
surface_p->nearzi = r_nearzi;
surface_p->flags = fa->flags;
surface_p->insubmodel = insubmodel;
surface_p->spanstate = 0;
surface_p->entity = currententity;
surface_p->key = r_currentkey++;
surface_p->spans = NULL;
pplane = fa->plane;
// FIXME: cache this?
TransformVector(pplane->normal, p_normal);
// FIXME: cache this?
distinv = 1.0 / (pplane->dist - DotProduct(modelorg, pplane->normal));
surface_p->d_zistepu = p_normal[0] * xscaleinv * distinv;
surface_p->d_zistepv = -p_normal[1] * yscaleinv * distinv;
surface_p->d_ziorigin = p_normal[2] * distinv -
xcenter * surface_p->d_zistepu - ycenter * surface_p->d_zistepv;
//JDC VectorCopy (r_worldmodelorg, surface_p->modelorg);
surface_p++;
}
/*
================
R_RenderFace
================
*/
void R_RenderFace(mface_t *fa, int clipflags)
{
int i;
unsigned mask;
cplane_t *pplane;
float distinv;
vec3_t p_normal;
medge_t tedge;
msurfedge_t *surfedge;
clipplane_t *pclip;
qboolean makeleftedge, makerightedge;
// translucent surfaces are not drawn by the edge renderer
if (fa->texinfo->c.flags & (SURF_TRANS33 | SURF_TRANS66)) {
fa->next = r_alpha_surfaces;
r_alpha_surfaces = fa;
return;
}
// sky surfaces encountered in the world will cause the
// environment box surfaces to be emited
if (fa->texinfo->c.flags & SURF_SKY) {
R_EmitSkyBox();
return;
}
// skip out if no more surfs
if ((surface_p) >= surf_max) {
r_outofsurfaces++;
return;
}
// ditto if not enough edges left, or switch to auxedges if possible
if ((edge_p + fa->numsurfedges + 4) >= edge_max) {
r_outofedges += fa->numsurfedges;
return;
}
c_faceclip++;
// set up clip planes
pclip = NULL;
for (i = 3, mask = 0x08; i >= 0; i--, mask >>= 1) {
if (clipflags & mask) {
view_clipplanes[i].next = pclip;
pclip = &view_clipplanes[i];
}
}
// push the edges through
r_emitted = 0;
r_nearzi = 0;
r_nearzionly = qfalse;
makeleftedge = makerightedge = qfalse;
r_lastvertvalid = qfalse;
surfedge = fa->firstsurfedge;
for (i = 0; i < fa->numsurfedges; i++, surfedge++) {
r_pedge = surfedge->edge;
// if the edge is cached, we can just reuse the edge
if (!insubmodel) {
if (r_pedge->cachededgeoffset & FULLY_CLIPPED_CACHED) {
if ((r_pedge->cachededgeoffset & FRAMECOUNT_MASK) ==
r_framecount) {
r_lastvertvalid = qfalse;
continue;
}
} else {
if ((((byte *)edge_p - (byte *)r_edges) >
r_pedge->cachededgeoffset) &&
(((edge_t *)((byte *)r_edges +
r_pedge->cachededgeoffset))->owner == r_pedge)) {
R_EmitCachedEdge();
r_lastvertvalid = qfalse;
continue;
}
}
}
// assume it's cacheable
cacheoffset = (byte *)edge_p - (byte *)r_edges;
r_leftclipped = r_rightclipped = qfalse;
R_ClipEdge(r_pedge->v[surfedge->vert ],
r_pedge->v[surfedge->vert ^ 1],
pclip);
r_pedge->cachededgeoffset = cacheoffset;
if (r_leftclipped)
makeleftedge = qtrue;
if (r_rightclipped)
makerightedge = qtrue;
r_lastvertvalid = qtrue;
}
// if there was a clip off the left edge, add that edge too
// FIXME: faster to do in screen space?
// FIXME: share clipped edges?
if (makeleftedge) {
r_pedge = &tedge;
r_lastvertvalid = qfalse;
R_ClipEdge(&r_leftexit, &r_leftenter, pclip->next);
}
// if there was a clip off the right edge, get the right r_nearzi
if (makerightedge) {
r_pedge = &tedge;
r_lastvertvalid = qfalse;
r_nearzionly = qtrue;
R_ClipEdge(&r_rightexit, &r_rightenter, view_clipplanes[1].next);
}
// if no edges made it out, return without posting the surface
if (!r_emitted)
return;
r_polycount++;
surface_p->msurf = fa;
surface_p->nearzi = r_nearzi;
surface_p->flags = fa->drawflags;
surface_p->insubmodel = insubmodel;
surface_p->spanstate = 0;
surface_p->entity = currententity;
surface_p->key = r_currentkey++;
surface_p->spans = NULL;
pplane = fa->plane;
// FIXME: cache this?
R_TransformVector(pplane->normal, p_normal);
// FIXME: cache this?
distinv = 1.0 / (pplane->dist - DotProduct(modelorg, pplane->normal));
surface_p->d_zistepu = p_normal[0] * xscaleinv * distinv;
surface_p->d_zistepv = -p_normal[1] * yscaleinv * distinv;
surface_p->d_ziorigin = p_normal[2] * distinv -
xcenter * surface_p->d_zistepu -
ycenter * surface_p->d_zistepv;
surface_p++;
}