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quakeforge/qw/source/r_bsp.c

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/*
r_bsp.c
(description)
Copyright (C) 1996-1997 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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <math.h>
#include "console.h"
#include "r_local.h"
#include "sys.h"
//
// current entity info
//
qboolean insubmodel;
entity_t *currententity;
vec3_t modelorg, base_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];
vec3_t r_worldmodelorg;
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
*/
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;
psideedges[0] = psideedges[1] = NULL;
makeclippededge = false;
// 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)) {
Con_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 = true;
} else {
pfrontexit = ptvert;
makeclippededge = true;
}
} 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)) {
Con_Printf ("Out of edges for bmodel\n");
return;
}
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 < 0) {
if (pn->contents != CONTENTS_SOLID) {
r_currentbkey = ((mleaf_t *) pn)->key;
R_RenderBmodelFace (psideedges[i], psurf);
}
} else {
R_RecursiveClipBPoly (psideedges[i], pnode->children[i],
psurf);
}
}
}
}
}
/*
R_DrawSolidClippedSubmodelPolygons
*/
void
R_DrawSolidClippedSubmodelPolygons (model_t *pmodel)
{
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))) {
// 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;
if (psurf->numedges > 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
R_RecursiveClipBPoly (pbedge, currententity->topnode, psurf);
} else {
Sys_Error ("no edges in bmodel");
}
}
}
}
/*
R_DrawSubmodelPolygons
*/
void
R_DrawSubmodelPolygons (model_t *pmodel, int clipflags)
{
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 *) currententity->topnode)->key;
// FIXME: use bounding-box-based frustum clipping info?
R_RenderFace (psurf, clipflags);
}
}
}
/*
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;
mleaf_t *pleaf;
double d, dot;
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
}
}
// if a leaf node, draw stuff
if (node->contents < 0) {
pleaf = (mleaf_t *) node;
mark = pleaf->firstmarksurface;
c = pleaf->nummarksurfaces;
if (c) {
do {
(*mark)->visframe = r_framecount;
mark++;
} while (--c);
}
// deal with model fragments in this leaf
if (pleaf->efrags) {
R_StoreEfrags (&pleaf->efrags);
}
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 = cl.worldmodel->surfaces + node->firstsurface;
if (dot < -BACKFACE_EPSILON) {
do {
if ((surf->flags & SURF_PLANEBACK) &&
(surf->visframe == r_framecount)) {
if (r_drawpolys) {
if (r_worldpolysbacktofront) {
if (numbtofpolys < MAX_BTOFPOLYS) {
pbtofpolys[numbtofpolys].clipflags =
clipflags;
pbtofpolys[numbtofpolys].psurf = surf;
numbtofpolys++;
}
} else {
R_RenderPoly (surf, clipflags);
}
} else {
R_RenderFace (surf, clipflags);
}
}
surf++;
} while (--c);
} else if (dot > BACKFACE_EPSILON) {
do {
if (!(surf->flags & SURF_PLANEBACK) &&
(surf->visframe == r_framecount)) {
if (r_drawpolys) {
if (r_worldpolysbacktofront) {
if (numbtofpolys < MAX_BTOFPOLYS) {
pbtofpolys[numbtofpolys].clipflags =
clipflags;
pbtofpolys[numbtofpolys].psurf = surf;
numbtofpolys++;
}
} else {
R_RenderPoly (surf, clipflags);
}
} else {
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)
{
int i;
model_t *clmodel;
btofpoly_t btofpolys[MAX_BTOFPOLYS];
pbtofpolys = btofpolys;
currententity = &r_worldentity;
VectorCopy (r_origin, modelorg);
clmodel = currententity->model;
r_pcurrentvertbase = clmodel->vertexes;
R_RecursiveWorldNode (clmodel->nodes, 15);
// if the driver wants the polygons back to front, play the visible ones back
// in that order
if (r_worldpolysbacktofront) {
for (i = numbtofpolys - 1; i >= 0; i--) {
R_RenderPoly (btofpolys[i].psurf, btofpolys[i].clipflags);
}
}
}
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