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-rw-r--r--source/sw_rast.c850
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diff --git a/source/sw_rast.c b/source/sw_rast.c
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--- /dev/null
+++ b/source/sw_rast.c
@@ -0,0 +1,850 @@
+/*
+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_rast.c
+
+#include "sw_local.h"
+
+#define MAXLEFTCLIPEDGES 100
+
+// !!! if these are changed, they must be changed in asm_draw.h too !!!
+#define FULLY_CLIPPED_CACHED 0x80000000
+#define FRAMECOUNT_MASK 0x7FFFFFFF
+
+unsigned int cacheoffset;
+
+int c_faceclip; // number of faces clipped
+
+
+clipplane_t *entity_clipplanes;
+clipplane_t view_clipplanes[4];
+clipplane_t world_clipplanes[16];
+
+medge_t *r_pedge;
+
+qboolean r_leftclipped, r_rightclipped;
+static qboolean makeleftedge, makerightedge;
+qboolean r_nearzionly;
+
+int sintable[CYCLE*2];
+int intsintable[CYCLE*2];
+int blanktable[CYCLE*2]; // PGM
+
+mvertex_t r_leftenter, r_leftexit;
+mvertex_t r_rightenter, r_rightexit;
+
+typedef struct
+{
+ float u,v;
+ int ceilv;
+} evert_t;
+
+int r_emitted;
+float r_nearzi;
+float r_u1, r_v1, r_lzi1;
+int r_ceilv1;
+
+qboolean r_lastvertvalid;
+int r_skyframe;
+
+msurface_t *r_skyfaces;
+mplane_t r_skyplanes[6];
+mtexinfo_t r_skytexinfo[6];
+mvertex_t *r_skyverts;
+medge_t *r_skyedges;
+int *r_skysurfedges;
+
+// I just copied this data from a box map...
+int skybox_planes[12] = {2,-128, 0,-128, 2,128, 1,128, 0,128, 1,-128};
+
+int box_surfedges[24] = { 1,2,3,4, -1,5,6,7, 8,9,-6,10, -2,-7,-9,11,
+ 12,-3,-11,-8, -12,-10,-5,-4};
+int box_edges[24] = { 1,2, 2,3, 3,4, 4,1, 1,5, 5,6, 6,2, 7,8, 8,6, 5,7, 8,3, 7,4};
+
+int box_faces[6] = {0,0,2,2,2,0};
+
+vec3_t box_vecs[6][2] = {
+ { {0,-1,0}, {-1,0,0} },
+ { {0,1,0}, {0,0,-1} },
+ { {0,-1,0}, {1,0,0} },
+ { {1,0,0}, {0,0,-1} },
+ { {0,-1,0}, {0,0,-1} },
+ { {-1,0,0}, {0,0,-1} }
+};
+
+float box_verts[8][3] = {
+ {-1,-1,-1},
+ {-1,1,-1},
+ {1,1,-1},
+ {1,-1,-1},
+ {-1,-1,1},
+ {-1,1,1},
+ {1,-1,1},
+ {1,1,1}
+};
+
+// down, west, up, north, east, south
+// {"rt", "bk", "lf", "ft", "up", "dn"};
+
+/*
+================
+R_InitSkyBox
+
+================
+*/
+void R_InitSkyBox (void)
+{
+ int i;
+ extern model_t *loadmodel;
+
+ r_skyfaces = loadmodel->surfaces + loadmodel->numsurfaces;
+ loadmodel->numsurfaces += 6;
+ r_skyverts = loadmodel->vertexes + loadmodel->numvertexes;
+ loadmodel->numvertexes += 8;
+ r_skyedges = loadmodel->edges + loadmodel->numedges;
+ loadmodel->numedges += 12;
+ r_skysurfedges = loadmodel->surfedges + loadmodel->numsurfedges;
+ loadmodel->numsurfedges += 24;
+ if (loadmodel->numsurfaces > MAX_MAP_FACES
+ || loadmodel->numvertexes > MAX_MAP_VERTS
+ || loadmodel->numedges > MAX_MAP_EDGES)
+ Com_Error (ERR_DROP, "InitSkyBox: map overflow");
+
+ memset (r_skyfaces, 0, 6*sizeof(*r_skyfaces));
+ for (i=0 ; i<6 ; i++)
+ {
+ r_skyplanes[i].normal[skybox_planes[i*2]] = 1;
+ r_skyplanes[i].dist = skybox_planes[i*2+1];
+
+ VectorCopy (box_vecs[i][0], r_skytexinfo[i].vecs[0]);
+ VectorCopy (box_vecs[i][1], r_skytexinfo[i].vecs[1]);
+
+ r_skyfaces[i].plane = &r_skyplanes[i];
+ r_skyfaces[i].numedges = 4;
+ r_skyfaces[i].flags = box_faces[i] | SURF_DRAWSKYBOX;
+ r_skyfaces[i].firstedge = loadmodel->numsurfedges-24+i*4;
+ r_skyfaces[i].texinfo = &r_skytexinfo[i];
+ r_skyfaces[i].texturemins[0] = -128;
+ r_skyfaces[i].texturemins[1] = -128;
+ r_skyfaces[i].extents[0] = 256;
+ r_skyfaces[i].extents[1] = 256;
+ }
+
+ for (i=0 ; i<24 ; i++)
+ if (box_surfedges[i] > 0)
+ r_skysurfedges[i] = loadmodel->numedges-13 + box_surfedges[i];
+ else
+ r_skysurfedges[i] = - (loadmodel->numedges-13 + -box_surfedges[i]);
+
+ for(i=0 ; i<12 ; i++)
+ {
+ r_skyedges[i].v[0] = loadmodel->numvertexes-9+box_edges[i*2+0];
+ r_skyedges[i].v[1] = loadmodel->numvertexes-9+box_edges[i*2+1];
+ r_skyedges[i].cachededgeoffset = 0;
+ }
+}
+
+/*
+================
+R_EmitSkyBox
+================
+*/
+void R_EmitSkyBox (void)
+{
+ int i, j;
+ int oldkey;
+
+ if (insubmodel)
+ return; // submodels should never have skies
+ if (r_skyframe == r_framecount)
+ return; // already set this frame
+
+ r_skyframe = r_framecount;
+
+ // set the eight fake vertexes
+ for (i=0 ; i<8 ; i++)
+ for (j=0 ; j<3 ; j++)
+ r_skyverts[i].position[j] = r_origin[j] + box_verts[i][j]*128;
+
+ // set the six fake planes
+ for (i=0 ; i<6 ; i++)
+ if (skybox_planes[i*2+1] > 0)
+ r_skyplanes[i].dist = r_origin[skybox_planes[i*2]]+128;
+ else
+ r_skyplanes[i].dist = r_origin[skybox_planes[i*2]]-128;
+
+ // fix texture offseets
+ for (i=0 ; i<6 ; i++)
+ {
+ r_skytexinfo[i].vecs[0][3] = -DotProduct (r_origin, r_skytexinfo[i].vecs[0]);
+ r_skytexinfo[i].vecs[1][3] = -DotProduct (r_origin, r_skytexinfo[i].vecs[1]);
+ }
+
+ // emit the six faces
+ oldkey = r_currentkey;
+ r_currentkey = 0x7ffffff0;
+ for (i=0 ; i<6 ; i++)
+ {
+ R_RenderFace (r_skyfaces + i, 15);
+ }
+ r_currentkey = oldkey; // bsp sorting order
+}
+
+
+#if !USE_ASM
+
+/*
+================
+R_EmitEdge
+================
+*/
+void R_EmitEdge (mvertex_t *pv0, mvertex_t *pv1)
+{
+ edge_t *edge, *pcheck;
+ int u_check;
+ float u, u_step;
+ vec3_t local, transformed;
+ float *world;
+ int v, v2, ceilv0;
+ float scale, lzi0, u0, v0;
+ int side;
+
+ if (r_lastvertvalid)
+ {
+ u0 = r_u1;
+ v0 = r_v1;
+ lzi0 = r_lzi1;
+ ceilv0 = r_ceilv1;
+ }
+ else
+ {
+ world = &pv0->position[0];
+
+ // transform and project
+ VectorSubtract (world, modelorg, local);
+ TransformVector (local, transformed);
+
+ if (transformed[2] < NEAR_CLIP)
+ transformed[2] = NEAR_CLIP;
+
+ lzi0 = 1.0 / transformed[2];
+
+ // FIXME: build x/yscale into transform?
+ scale = xscale * lzi0;
+ u0 = (xcenter + scale*transformed[0]);
+ if (u0 < r_refdef.fvrectx_adj)
+ u0 = r_refdef.fvrectx_adj;
+ if (u0 > r_refdef.fvrectright_adj)
+ u0 = r_refdef.fvrectright_adj;
+
+ scale = yscale * lzi0;
+ v0 = (ycenter - scale*transformed[1]);
+ if (v0 < r_refdef.fvrecty_adj)
+ v0 = r_refdef.fvrecty_adj;
+ if (v0 > r_refdef.fvrectbottom_adj)
+ v0 = r_refdef.fvrectbottom_adj;
+
+ ceilv0 = (int) ceil(v0);
+ }
+
+ world = &pv1->position[0];
+
+// transform and project
+ VectorSubtract (world, modelorg, local);
+ TransformVector (local, transformed);
+
+ if (transformed[2] < NEAR_CLIP)
+ transformed[2] = NEAR_CLIP;
+
+ r_lzi1 = 1.0 / transformed[2];
+
+ scale = xscale * r_lzi1;
+ r_u1 = (xcenter + scale*transformed[0]);
+ if (r_u1 < r_refdef.fvrectx_adj)
+ r_u1 = r_refdef.fvrectx_adj;
+ if (r_u1 > r_refdef.fvrectright_adj)
+ r_u1 = r_refdef.fvrectright_adj;
+
+ scale = yscale * r_lzi1;
+ r_v1 = (ycenter - scale*transformed[1]);
+ if (r_v1 < r_refdef.fvrecty_adj)
+ r_v1 = r_refdef.fvrecty_adj;
+ if (r_v1 > r_refdef.fvrectbottom_adj)
+ r_v1 = r_refdef.fvrectbottom_adj;
+
+ if (r_lzi1 > lzi0)
+ lzi0 = r_lzi1;
+
+ if (lzi0 > r_nearzi) // for mipmap finding
+ r_nearzi = lzi0;
+
+// for right edges, all we want is the effect on 1/z
+ if (r_nearzionly)
+ return;
+
+ r_emitted = 1;
+
+ r_ceilv1 = (int) ceil(r_v1);
+
+
+// create the edge
+ if (ceilv0 == r_ceilv1)
+ {
+ // we cache unclipped horizontal edges as fully clipped
+ if (cacheoffset != 0x7FFFFFFF)
+ {
+ cacheoffset = FULLY_CLIPPED_CACHED |
+ (r_framecount & FRAMECOUNT_MASK);
+ }
+
+ return; // horizontal edge
+ }
+
+ side = ceilv0 > r_ceilv1;
+
+ edge = edge_p++;
+
+ edge->owner = r_pedge;
+
+ edge->nearzi = lzi0;
+
+ if (side == 0)
+ {
+ // trailing edge (go from p1 to p2)
+ v = ceilv0;
+ v2 = r_ceilv1 - 1;
+
+ edge->surfs[0] = surface_p - surfaces;
+ edge->surfs[1] = 0;
+
+ u_step = ((r_u1 - u0) / (r_v1 - v0));
+ u = u0 + ((float)v - v0) * u_step;
+ }
+ else
+ {
+ // leading edge (go from p2 to p1)
+ v2 = ceilv0 - 1;
+ v = r_ceilv1;
+
+ edge->surfs[0] = 0;
+ edge->surfs[1] = surface_p - surfaces;
+
+ u_step = ((u0 - r_u1) / (v0 - r_v1));
+ u = r_u1 + ((float)v - r_v1) * u_step;
+ }
+
+ edge->u_step = u_step*0x100000;
+ edge->u = u*0x100000 + 0xFFFFF;
+
+// we need to do this to avoid stepping off the edges if a very nearly
+// horizontal edge is less than epsilon above a scan, and numeric error causes
+// it to incorrectly extend to the scan, and the extension of the line goes off
+// the edge of the screen
+// FIXME: is this actually needed?
+ if (edge->u < r_refdef.vrect_x_adj_shift20)
+ edge->u = r_refdef.vrect_x_adj_shift20;
+ if (edge->u > r_refdef.vrectright_adj_shift20)
+ edge->u = r_refdef.vrectright_adj_shift20;
+
+//
+// sort the edge in normally
+//
+ u_check = edge->u;
+ if (edge->surfs[0])
+ u_check++; // sort trailers after leaders
+
+ if (!newedges[v] || newedges[v]->u >= u_check)
+ {
+ edge->next = newedges[v];
+ newedges[v] = edge;
+ }
+ else
+ {
+ pcheck = newedges[v];
+ while (pcheck->next && pcheck->next->u < u_check)
+ pcheck = pcheck->next;
+ edge->next = pcheck->next;
+ pcheck->next = edge;
+ }
+
+ edge->nextremove = removeedges[v2];
+ removeedges[v2] = edge;
+}
+
+
+/*
+================
+R_ClipEdge
+================
+*/
+void R_ClipEdge (mvertex_t *pv0, mvertex_t *pv1, clipplane_t *clip)
+{
+ float d0, d1, f;
+ mvertex_t clipvert;
+
+ if (clip)
+ {
+ do
+ {
+ d0 = DotProduct (pv0->position, clip->normal) - clip->dist;
+ d1 = DotProduct (pv1->position, clip->normal) - clip->dist;
+
+ if (d0 >= 0)
+ {
+ // point 0 is unclipped
+ if (d1 >= 0)
+ {
+ // both points are unclipped
+ continue;
+ }
+
+ // only point 1 is clipped
+
+ // we don't cache clipped edges
+ cacheoffset = 0x7FFFFFFF;
+
+ f = d0 / (d0 - d1);
+ clipvert.position[0] = pv0->position[0] +
+ f * (pv1->position[0] - pv0->position[0]);
+ clipvert.position[1] = pv0->position[1] +
+ f * (pv1->position[1] - pv0->position[1]);
+ clipvert.position[2] = pv0->position[2] +
+ f * (pv1->position[2] - pv0->position[2]);
+
+ if (clip->leftedge)
+ {
+ r_leftclipped = qtrue;
+ r_leftexit = clipvert;
+ }
+ else if (clip->rightedge)
+ {
+ r_rightclipped = qtrue;
+ r_rightexit = clipvert;
+ }
+
+ R_ClipEdge (pv0, &clipvert, clip->next);
+ return;
+ }
+ else
+ {
+ // point 0 is clipped
+ if (d1 < 0)
+ {
+ // both points are clipped
+ // we do cache fully clipped edges
+ if (!r_leftclipped)
+ cacheoffset = FULLY_CLIPPED_CACHED |
+ (r_framecount & FRAMECOUNT_MASK);
+ return;
+ }
+
+ // only point 0 is clipped
+ r_lastvertvalid = qfalse;
+
+ // we don't cache partially clipped edges
+ cacheoffset = 0x7FFFFFFF;
+
+ f = d0 / (d0 - d1);
+ clipvert.position[0] = pv0->position[0] +
+ f * (pv1->position[0] - pv0->position[0]);
+ clipvert.position[1] = pv0->position[1] +
+ f * (pv1->position[1] - pv0->position[1]);
+ clipvert.position[2] = pv0->position[2] +
+ f * (pv1->position[2] - pv0->position[2]);
+
+ if (clip->leftedge)
+ {
+ r_leftclipped = qtrue;
+ r_leftenter = clipvert;
+ }
+ else if (clip->rightedge)
+ {
+ r_rightclipped = qtrue;
+ r_rightenter = clipvert;
+ }
+
+ R_ClipEdge (&clipvert, pv1, clip->next);
+ return;
+ }
+ } while ((clip = clip->next) != NULL);
+ }
+
+// add the edge
+ R_EmitEdge (pv0, pv1);
+}
+
+#endif // !USE_ASM
+
+
+/*
+================
+R_EmitCachedEdge
+================
+*/
+void R_EmitCachedEdge (void)
+{
+ edge_t *pedge_t;
+
+ pedge_t = (edge_t *)((unsigned long)r_edges + r_pedge->cachededgeoffset);
+
+ if (!pedge_t->surfs[0])
+ pedge_t->surfs[0] = surface_p - surfaces;
+ else
+ pedge_t->surfs[1] = surface_p - surfaces;
+
+ if (pedge_t->nearzi > r_nearzi) // for mipmap finding
+ r_nearzi = pedge_t->nearzi;
+
+ r_emitted = 1;
+}
+
+
+/*
+================
+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;
+
+ // translucent surfaces are not drawn by the edge renderer
+ if (fa->texinfo->flags & (SURF_TRANS33|SURF_TRANS66))
+ {
+ fa->nextalphasurface = 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->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->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 = qfalse;
+ makeleftedge = makerightedge = qfalse;
+ pedges = currentmodel->edges;
+ r_lastvertvalid = qfalse;
+
+ for (i=0 ; i<fa->numedges ; i++)
+ {
+ lindex = currentmodel->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 = qfalse;
+ 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 = qfalse;
+ continue;
+ }
+ }
+ }
+
+ // assume it's cacheable
+ cacheoffset = (byte *)edge_p - (byte *)r_edges;
+ r_leftclipped = r_rightclipped = qfalse;
+ R_ClipEdge (&r_pcurrentvertbase[r_pedge->v[0]],
+ &r_pcurrentvertbase[r_pedge->v[1]],
+ pclip);
+ r_pedge->cachededgeoffset = cacheoffset;
+
+ if (r_leftclipped)
+ makeleftedge = qtrue;
+ if (r_rightclipped)
+ makerightedge = qtrue;
+ r_lastvertvalid = qtrue;
+ }
+ 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 = qfalse;
+ 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 = qfalse;
+ continue;
+ }
+ }
+ }
+
+ // assume it's cacheable
+ cacheoffset = (byte *)edge_p - (byte *)r_edges;
+ r_leftclipped = r_rightclipped = qfalse;
+ R_ClipEdge (&r_pcurrentvertbase[r_pedge->v[1]],
+ &r_pcurrentvertbase[r_pedge->v[0]],
+ 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->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;
+
+ surface_p++;
+}
+
+
+/*
+================
+R_RenderBmodelFace
+================
+*/
+void R_RenderBmodelFace (bedge_t *pedges, msurface_t *psurf)
+{
+ int i;
+ unsigned mask;
+ mplane_t *pplane;
+ float distinv;
+ vec3_t p_normal;
+ medge_t tedge;
+ clipplane_t *pclip;
+
+ if (psurf->texinfo->flags & (SURF_TRANS33|SURF_TRANS66))
+ {
+ psurf->nextalphasurface = r_alpha_surfaces;
+ r_alpha_surfaces = psurf;
+ 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 + psurf->numedges + 4) >= edge_max)
+ {
+ r_outofedges += psurf->numedges;
+ return;
+ }
+
+ c_faceclip++;
+
+// this is a dummy to give the caching mechanism someplace to write to
+ r_pedge = &tedge;
+
+// set up clip planes
+ pclip = NULL;
+
+ for (i=3, mask = 0x08 ; i>=0 ; i--, mask >>= 1)
+ {
+ if (r_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;
+// FIXME: keep clipped bmodel edges in clockwise order so last vertex caching
+// can be used?
+ r_lastvertvalid = qfalse;
+
+ for ( ; pedges ; pedges = pedges->pnext)
+ {
+ r_leftclipped = r_rightclipped = qfalse;
+ R_ClipEdge (pedges->v[0], pedges->v[1], pclip);
+
+ if (r_leftclipped)
+ makeleftedge = qtrue;
+ if (r_rightclipped)
+ makerightedge = 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_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_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 = psurf;
+ surface_p->nearzi = r_nearzi;
+ surface_p->flags = psurf->flags;
+ surface_p->insubmodel = qtrue;
+ surface_p->spanstate = 0;
+ surface_p->entity = currententity;
+ surface_p->key = r_currentbkey;
+ surface_p->spans = NULL;
+
+ pplane = psurf->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;
+
+ surface_p++;
+}
+
generated by cgit v1.2.3 (git 2.46.0) at 2025-08-03 06:53:08 +0000