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diff --git a/source/sw_bsp.c b/source/sw_bsp.c
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+/*
+Copyright (C) 1997-2001 Id Software, Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+*/
+// r_bsp.c
+
+#include "sw_local.h"
+
+//
+// current entity info
+//
+qboolean insubmodel;
+entity_t *currententity;
+vec3_t modelorg; // modelorg is the viewpoint reletive to
+ // the currently rendering entity
+vec3_t r_entorigin; // the currently rendering entity in world
+ // coordinates
+
+float entity_rotation[3][3];
+
+int r_currentbkey;
+
+typedef enum {touchessolid, drawnode, nodrawnode} solidstate_t;
+
+#define MAX_BMODEL_VERTS 500 // 6K
+#define MAX_BMODEL_EDGES 1000 // 12K
+
+static mvertex_t *pbverts;
+static bedge_t *pbedges;
+static int numbverts, numbedges;
+
+static mvertex_t *pfrontenter, *pfrontexit;
+
+static qboolean makeclippededge;
+
+
+//===========================================================================
+
+/*
+================
+R_EntityRotate
+================
+*/
+void R_EntityRotate (vec3_t vec)
+{
+ vec3_t tvec;
+
+ VectorCopy (vec, tvec);
+ vec[0] = DotProduct (entity_rotation[0], tvec);
+ vec[1] = DotProduct (entity_rotation[1], tvec);
+ vec[2] = DotProduct (entity_rotation[2], tvec);
+}
+
+
+/*
+================
+R_RotateBmodel
+================
+*/
+void R_RotateBmodel (void)
+{
+ float angle, s, c, temp1[3][3], temp2[3][3], temp3[3][3];
+
+// TODO: should use a look-up table
+// TODO: should really be stored with the entity instead of being reconstructed
+// TODO: could cache lazily, stored in the entity
+// TODO: share work with R_SetUpAliasTransform
+
+// yaw
+ angle = currententity->angles[YAW];
+ angle = angle * M_PI*2 / 360;
+ s = sin(angle);
+ c = cos(angle);
+
+ temp1[0][0] = c;
+ temp1[0][1] = s;
+ temp1[0][2] = 0;
+ temp1[1][0] = -s;
+ temp1[1][1] = c;
+ temp1[1][2] = 0;
+ temp1[2][0] = 0;
+ temp1[2][1] = 0;
+ temp1[2][2] = 1;
+
+
+// pitch
+ angle = currententity->angles[PITCH];
+ angle = angle * M_PI*2 / 360;
+ s = sin(angle);
+ c = cos(angle);
+
+ temp2[0][0] = c;
+ temp2[0][1] = 0;
+ temp2[0][2] = -s;
+ temp2[1][0] = 0;
+ temp2[1][1] = 1;
+ temp2[1][2] = 0;
+ temp2[2][0] = s;
+ temp2[2][1] = 0;
+ temp2[2][2] = c;
+
+ R_ConcatRotations (temp2, temp1, temp3);
+
+// roll
+ angle = currententity->angles[ROLL];
+ angle = angle * M_PI*2 / 360;
+ s = sin(angle);
+ c = cos(angle);
+
+ temp1[0][0] = 1;
+ temp1[0][1] = 0;
+ temp1[0][2] = 0;
+ temp1[1][0] = 0;
+ temp1[1][1] = c;
+ temp1[1][2] = s;
+ temp1[2][0] = 0;
+ temp1[2][1] = -s;
+ temp1[2][2] = c;
+
+ R_ConcatRotations (temp1, temp3, entity_rotation);
+
+//
+// rotate modelorg and the transformation matrix
+//
+ R_EntityRotate (modelorg);
+ R_EntityRotate (vpn);
+ R_EntityRotate (vright);
+ R_EntityRotate (vup);
+
+ R_TransformFrustum ();
+}
+
+
+/*
+================
+R_RecursiveClipBPoly
+
+Clip a bmodel poly down the world bsp tree
+================
+*/
+void R_RecursiveClipBPoly (bedge_t *pedges, mnode_t *pnode, msurface_t *psurf)
+{
+ bedge_t *psideedges[2], *pnextedge, *ptedge;
+ int i, side, lastside;
+ float dist, frac, lastdist;
+ mplane_t *splitplane, tplane;
+ mvertex_t *pvert, *plastvert, *ptvert;
+ mnode_t *pn;
+ int area;
+
+ psideedges[0] = psideedges[1] = NULL;
+
+ makeclippededge = qfalse;
+
+// transform the BSP plane into model space
+// FIXME: cache these?
+ splitplane = pnode->plane;
+ tplane.dist = splitplane->dist -
+ DotProduct(r_entorigin, splitplane->normal);
+ tplane.normal[0] = DotProduct (entity_rotation[0], splitplane->normal);
+ tplane.normal[1] = DotProduct (entity_rotation[1], splitplane->normal);
+ tplane.normal[2] = DotProduct (entity_rotation[2], splitplane->normal);
+
+// clip edges to BSP plane
+ for ( ; pedges ; pedges = pnextedge)
+ {
+ pnextedge = pedges->pnext;
+
+ // set the status for the last point as the previous point
+ // FIXME: cache this stuff somehow?
+ plastvert = pedges->v[0];
+ lastdist = DotProduct (plastvert->position, tplane.normal) -
+ tplane.dist;
+
+ if (lastdist > 0)
+ lastside = 0;
+ else
+ lastside = 1;
+
+ pvert = pedges->v[1];
+
+ dist = DotProduct (pvert->position, tplane.normal) - tplane.dist;
+
+ if (dist > 0)
+ side = 0;
+ else
+ side = 1;
+
+ if (side != lastside)
+ {
+ // clipped
+ if (numbverts >= MAX_BMODEL_VERTS)
+ return;
+
+ // generate the clipped vertex
+ frac = lastdist / (lastdist - dist);
+ ptvert = &pbverts[numbverts++];
+ ptvert->position[0] = plastvert->position[0] +
+ frac * (pvert->position[0] -
+ plastvert->position[0]);
+ ptvert->position[1] = plastvert->position[1] +
+ frac * (pvert->position[1] -
+ plastvert->position[1]);
+ ptvert->position[2] = plastvert->position[2] +
+ frac * (pvert->position[2] -
+ plastvert->position[2]);
+
+ // split into two edges, one on each side, and remember entering
+ // and exiting points
+ // FIXME: share the clip edge by having a winding direction flag?
+ if (numbedges >= (MAX_BMODEL_EDGES - 1))
+ {
+ Com_Printf("Out of edges for bmodel\n");
+ return;
+ }
+
+ ptedge = &pbedges[numbedges];
+ ptedge->pnext = psideedges[lastside];
+ psideedges[lastside] = ptedge;
+ ptedge->v[0] = plastvert;
+ ptedge->v[1] = ptvert;
+
+ ptedge = &pbedges[numbedges + 1];
+ ptedge->pnext = psideedges[side];
+ psideedges[side] = ptedge;
+ ptedge->v[0] = ptvert;
+ ptedge->v[1] = pvert;
+
+ numbedges += 2;
+
+ if (side == 0)
+ {
+ // entering for front, exiting for back
+ pfrontenter = ptvert;
+ makeclippededge = qtrue;
+ }
+ else
+ {
+ pfrontexit = ptvert;
+ makeclippededge = qtrue;
+ }
+ }
+ else
+ {
+ // add the edge to the appropriate side
+ pedges->pnext = psideedges[side];
+ psideedges[side] = pedges;
+ }
+ }
+
+// if anything was clipped, reconstitute and add the edges along the clip
+// plane to both sides (but in opposite directions)
+ if (makeclippededge)
+ {
+ if (numbedges >= (MAX_BMODEL_EDGES - 2))
+ {
+ Com_Error( ERR_DROP, "Out of edges for bmodel" );
+ }
+
+ ptedge = &pbedges[numbedges];
+ ptedge->pnext = psideedges[0];
+ psideedges[0] = ptedge;
+ ptedge->v[0] = pfrontexit;
+ ptedge->v[1] = pfrontenter;
+
+ ptedge = &pbedges[numbedges + 1];
+ ptedge->pnext = psideedges[1];
+ psideedges[1] = ptedge;
+ ptedge->v[0] = pfrontenter;
+ ptedge->v[1] = pfrontexit;
+
+ numbedges += 2;
+ }
+
+// draw or recurse further
+ for (i=0 ; i<2 ; i++)
+ {
+ if (psideedges[i])
+ {
+ // draw if we've reached a non-solid leaf, done if all that's left is a
+ // solid leaf, and continue down the tree if it's not a leaf
+ pn = pnode->children[i];
+
+ // we're done with this branch if the node or leaf isn't in the PVS
+ if (pn->visframe == r_visframecount)
+ {
+ if (pn->contents != CONTENTS_NODE)
+ {
+ if (pn->contents != CONTENTS_SOLID)
+ {
+ if (r_newrefdef.areabits)
+ {
+ area = ((mleaf_t *)pn)->area;
+ if (! (r_newrefdef.areabits[area>>3] & (1<<(area&7)) ) )
+ continue; // not visible
+ }
+
+ r_currentbkey = ((mleaf_t *)pn)->key;
+ R_RenderBmodelFace (psideedges[i], psurf);
+ }
+ }
+ else
+ {
+ R_RecursiveClipBPoly (psideedges[i], pnode->children[i],
+ psurf);
+ }
+ }
+ }
+ }
+}
+
+
+/*
+================
+R_DrawSolidClippedSubmodelPolygons
+
+Bmodel crosses multiple leafs
+================
+*/
+void R_DrawSolidClippedSubmodelPolygons (model_t *pmodel, mnode_t *topnode)
+{
+ int i, j, lindex;
+ vec_t dot;
+ msurface_t *psurf;
+ int numsurfaces;
+ mplane_t *pplane;
+ mvertex_t bverts[MAX_BMODEL_VERTS];
+ bedge_t bedges[MAX_BMODEL_EDGES], *pbedge;
+ medge_t *pedge, *pedges;
+
+// FIXME: use bounding-box-based frustum clipping info?
+
+ psurf = &pmodel->surfaces[pmodel->firstmodelsurface];
+ numsurfaces = pmodel->nummodelsurfaces;
+ pedges = pmodel->edges;
+
+ for (i=0 ; i<numsurfaces ; i++, psurf++)
+ {
+ // find which side of the node we are on
+ pplane = psurf->plane;
+
+ dot = DotProduct (modelorg, pplane->normal) - pplane->dist;
+
+ // draw the polygon
+ if (( !(psurf->flags & SURF_PLANEBACK) && (dot < -BACKFACE_EPSILON)) ||
+ ((psurf->flags & SURF_PLANEBACK) && (dot > BACKFACE_EPSILON)))
+ continue;
+
+ // FIXME: use bounding-box-based frustum clipping info?
+
+ // copy the edges to bedges, flipping if necessary so always
+ // clockwise winding
+ // FIXME: if edges and vertices get caches, these assignments must move
+ // outside the loop, and overflow checking must be done here
+ pbverts = bverts;
+ pbedges = bedges;
+ numbverts = numbedges = 0;
+ pbedge = &bedges[numbedges];
+ numbedges += psurf->numedges;
+
+ for (j=0 ; j<psurf->numedges ; j++)
+ {
+ lindex = pmodel->surfedges[psurf->firstedge+j];
+
+ if (lindex > 0)
+ {
+ pedge = &pedges[lindex];
+ pbedge[j].v[0] = &r_pcurrentvertbase[pedge->v[0]];
+ pbedge[j].v[1] = &r_pcurrentvertbase[pedge->v[1]];
+ }
+ else
+ {
+ lindex = -lindex;
+ pedge = &pedges[lindex];
+ pbedge[j].v[0] = &r_pcurrentvertbase[pedge->v[1]];
+ pbedge[j].v[1] = &r_pcurrentvertbase[pedge->v[0]];
+ }
+
+ pbedge[j].pnext = &pbedge[j+1];
+ }
+
+ pbedge[j-1].pnext = NULL; // mark end of edges
+
+ if ( !( psurf->texinfo->flags & ( SURF_TRANS66 | SURF_TRANS33 ) ) )
+ R_RecursiveClipBPoly (pbedge, topnode, psurf);
+ else
+ R_RenderBmodelFace( pbedge, psurf );
+ }
+}
+
+
+/*
+================
+R_DrawSubmodelPolygons
+
+All in one leaf
+================
+*/
+void R_DrawSubmodelPolygons (model_t *pmodel, int clipflags, mnode_t *topnode)
+{
+ int i;
+ vec_t dot;
+ msurface_t *psurf;
+ int numsurfaces;
+ mplane_t *pplane;
+
+// FIXME: use bounding-box-based frustum clipping info?
+
+ psurf = &pmodel->surfaces[pmodel->firstmodelsurface];
+ numsurfaces = pmodel->nummodelsurfaces;
+
+ for (i=0 ; i<numsurfaces ; i++, psurf++)
+ {
+ // find which side of the node we are on
+ pplane = psurf->plane;
+
+ dot = DotProduct (modelorg, pplane->normal) - pplane->dist;
+
+ // draw the polygon
+ if (((psurf->flags & SURF_PLANEBACK) && (dot < -BACKFACE_EPSILON)) ||
+ (!(psurf->flags & SURF_PLANEBACK) && (dot > BACKFACE_EPSILON)))
+ {
+ r_currentkey = ((mleaf_t *)topnode)->key;
+
+ // FIXME: use bounding-box-based frustum clipping info?
+ R_RenderFace (psurf, clipflags);
+ }
+ }
+}
+
+
+int c_drawnode;
+
+/*
+================
+R_RecursiveWorldNode
+================
+*/
+void R_RecursiveWorldNode (mnode_t *node, int clipflags)
+{
+ int i, c, side, *pindex;
+ vec3_t acceptpt, rejectpt;
+ mplane_t *plane;
+ msurface_t *surf, **mark;
+ float d, dot;
+ mleaf_t *pleaf;
+
+ if (node->contents == CONTENTS_SOLID)
+ return; // solid
+
+ if (node->visframe != r_visframecount)
+ return;
+
+// cull the clipping planes if not trivial accept
+// FIXME: the compiler is doing a lousy job of optimizing here; it could be
+// twice as fast in ASM
+ if (clipflags)
+ {
+ for (i=0 ; i<4 ; i++)
+ {
+ if (! (clipflags & (1<<i)) )
+ continue; // don't need to clip against it
+
+ // generate accept and reject points
+ // FIXME: do with fast look-ups or integer tests based on the sign bit
+ // of the floating point values
+
+ pindex = pfrustum_indexes[i];
+
+ rejectpt[0] = (float)node->minmaxs[pindex[0]];
+ rejectpt[1] = (float)node->minmaxs[pindex[1]];
+ rejectpt[2] = (float)node->minmaxs[pindex[2]];
+
+ d = DotProduct (rejectpt, view_clipplanes[i].normal);
+ d -= view_clipplanes[i].dist;
+ if (d <= 0)
+ return;
+ acceptpt[0] = (float)node->minmaxs[pindex[3+0]];
+ acceptpt[1] = (float)node->minmaxs[pindex[3+1]];
+ acceptpt[2] = (float)node->minmaxs[pindex[3+2]];
+
+ d = DotProduct (acceptpt, view_clipplanes[i].normal);
+ d -= view_clipplanes[i].dist;
+
+ if (d >= 0)
+ clipflags &= ~(1<<i); // node is entirely on screen
+ }
+ }
+
+c_drawnode++;
+
+// if a leaf node, draw stuff
+ if (node->contents != -1)
+ {
+ pleaf = (mleaf_t *)node;
+
+ // check for door connected areas
+ if (r_newrefdef.areabits)
+ {
+ if (! (r_newrefdef.areabits[pleaf->area>>3] & (1<<(pleaf->area&7)) ) )
+ return; // not visible
+ }
+
+ mark = pleaf->firstmarksurface;
+ c = pleaf->nummarksurfaces;
+
+ if (c)
+ {
+ do
+ {
+ (*mark)->visframe = r_framecount;
+ mark++;
+ } while (--c);
+ }
+
+ pleaf->key = r_currentkey;
+ r_currentkey++; // all bmodels in a leaf share the same key
+ }
+ else
+ {
+ // node is just a decision point, so go down the apropriate sides
+
+ // find which side of the node we are on
+ plane = node->plane;
+
+ switch (plane->type)
+ {
+ case PLANE_X:
+ dot = modelorg[0] - plane->dist;
+ break;
+ case PLANE_Y:
+ dot = modelorg[1] - plane->dist;
+ break;
+ case PLANE_Z:
+ dot = modelorg[2] - plane->dist;
+ break;
+ default:
+ dot = DotProduct (modelorg, plane->normal) - plane->dist;
+ break;
+ }
+
+ if (dot >= 0)
+ side = 0;
+ else
+ side = 1;
+
+ // recurse down the children, front side first
+ R_RecursiveWorldNode (node->children[side], clipflags);
+
+ // draw stuff
+ c = node->numsurfaces;
+
+ if (c)
+ {
+ surf = r_worldmodel->surfaces + node->firstsurface;
+
+ if (dot < -BACKFACE_EPSILON)
+ {
+ do
+ {
+ if ((surf->flags & SURF_PLANEBACK) &&
+ (surf->visframe == r_framecount))
+ {
+ R_RenderFace (surf, clipflags);
+ }
+
+ surf++;
+ } while (--c);
+ }
+ else if (dot > BACKFACE_EPSILON)
+ {
+ do
+ {
+ if (!(surf->flags & SURF_PLANEBACK) &&
+ (surf->visframe == r_framecount))
+ {
+ R_RenderFace (surf, clipflags);
+ }
+
+ surf++;
+ } while (--c);
+ }
+
+ // all surfaces on the same node share the same sequence number
+ r_currentkey++;
+ }
+
+ // recurse down the back side
+ R_RecursiveWorldNode (node->children[!side], clipflags);
+ }
+}
+
+
+
+/*
+================
+R_RenderWorld
+================
+*/
+void R_RenderWorld (void)
+{
+
+ if (!r_drawworld->integer)
+ return;
+ if ( r_newrefdef.rdflags & RDF_NOWORLDMODEL )
+ return;
+
+ c_drawnode=0;
+
+ // auto cycle the world frame for texture animation
+ r_worldentity.frame = (int)(r_newrefdef.time*2);
+ currententity = &r_worldentity;
+
+ VectorCopy (r_origin, modelorg);
+ currentmodel = r_worldmodel;
+ r_pcurrentvertbase = currentmodel->vertexes;
+
+ R_RecursiveWorldNode (currentmodel->nodes, 15);
+}
+
+
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