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#ifndef lint
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static const char RCSid[] = "$Id$";
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#endif
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/*
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* Geometry drawing operations for OpenGL driver.
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*/
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#include "radogl.h"
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#include "rhdriver.h"
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#ifndef MAXGEO
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#define MAXGEO 8 /* maximum geometry list length */
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#endif
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#ifndef MAXPORT
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#define MAXPORT (MAXGEO*4) /* maximum number of portal files */
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#endif
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int gmPortals = 0; /* current portal GL list id */
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static int Nlists = 0; /* number of lists allocated */
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static char *curportlist[MAXPORT]; /* current portal list */
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static char *newportlist[MAXPORT]; /* new portal file list */
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static struct gmEntry {
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char *gfile; /* geometry file name */
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FVECT cent; /* centroid */
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FLOAT rad; /* radius */
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int listid; /* display list identifier */
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int nlists; /* number of lists allocated */
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} gmCurrent[MAXGEO], gmNext[MAXGEO]; /* current and next list */
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#define FORALLGEOM(ot,i) for (i=0;i<MAXGEO&&ot[i].gfile!=NULL;i++)
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#define FORALLPORT(pl,i) for (i=0;i<MAXPORT&&pl[i]!=NULL;i++)
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extern char *nextword();
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gmNewGeom(file) /* add new geometry to next list */
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char *file;
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{
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register int i, j;
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/* check if already in next list */
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FORALLGEOM(gmNext, i)
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if (!strcmp(file, gmNext[i].gfile))
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return;
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if (i >= MAXGEO) {
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error(WARNING, "too many section octrees -- ignoring extra");
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return;
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}
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/* check if copy in current list */
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FORALLGEOM(gmCurrent, j)
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if (!strcmp(file, gmCurrent[j].gfile)) {
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copystruct(&gmNext[i], &gmCurrent[j]);
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return;
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}
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/* else load new octree */
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gmNext[i].gfile = savestr(file);
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dolights = 0;
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domats = 1;
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gmNext[i].listid = rgl_octlist(file, gmNext[i].cent, &gmNext[i].rad,
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&gmNext[i].nlists);
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gmNext[i].rad *= 1.732; /* go to corners */
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#ifdef DEBUG
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fprintf(stderr, "Loaded octree \"%s\" into listID %d with radius %f\n",
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file, gmNext[i].listid, gmNext[i].rad);
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#endif
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}
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gmEndGeom() /* make next list current */
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{
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register int i, j;
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FORALLGEOM(gmCurrent, i) {
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FORALLGEOM(gmNext, j)
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if (gmNext[j].listid == gmCurrent[i].listid)
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break;
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if (j >= MAXGEO || gmNext[j].gfile == NULL) {
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glDeleteLists(gmCurrent[i].listid, /* not found */
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gmCurrent[i].nlists);
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freestr(gmCurrent[i].gfile);
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}
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}
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bcopy((char *)gmNext, (char *)gmCurrent, sizeof(gmNext));
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bzero((char *)gmNext, sizeof(gmNext));
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}
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int
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gmDrawGeom() /* draw current list of octrees */
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{
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register int n;
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FORALLGEOM(gmCurrent, n)
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glCallList(gmCurrent[n].listid);
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return(n);
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}
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gmDrawPortals(r, g, b, a) /* draw portals with specific RGBA value */
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int r, g, b, a;
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{
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if (!gmPortals || r<0 & g<0 & b<0 & a<0)
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return;
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glPushAttrib(GL_DEPTH_BUFFER_BIT|GL_COLOR_BUFFER_BIT|
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GL_POLYGON_BIT|GL_LIGHTING_BIT);
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glDisable(GL_LIGHTING);
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glDisable(GL_DITHER);
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glShadeModel(GL_FLAT);
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glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
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/* don't actually write depth */
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glDepthMask(GL_FALSE);
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/* draw only selected channels */
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glColorMask(r>=0, g>=0, b>=0, a>=0);
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glColor4ub(r&0xff, g&0xff, b&0xff, a&0xff);
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glCallList(gmPortals); /* draw them portals */
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glPopAttrib();
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}
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gmDepthLimit(dl, vorg, vdir) /* compute approximate depth limits for view */
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double dl[2];
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FVECT vorg, vdir;
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{
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FVECT v;
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double dcent;
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register int i;
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dl[0] = FHUGE; dl[1] = 0.;
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FORALLGEOM(gmCurrent, i) {
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VSUB(v, gmCurrent[i].cent, vorg);
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dcent = DOT(v, vdir);
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if (dl[0] > dcent-gmCurrent[i].rad)
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dl[0] = dcent-gmCurrent[i].rad;
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if (dl[1] < dcent+gmCurrent[i].rad)
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dl[1] = dcent+gmCurrent[i].rad;
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}
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if (dl[0] < 0.)
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dl[0] = 0.;
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}
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gmNewPortal(pflist) /* add portal file(s) to our new list */
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char *pflist;
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{
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register int i, j;
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char newfile[128];
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if (pflist == NULL)
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return;
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while ((pflist = nextword(newfile, sizeof(newfile), pflist)) != NULL) {
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FORALLPORT(newportlist,i)
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if (!strcmp(newportlist[i], newfile))
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goto endloop; /* in list already */
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if (i >= MAXPORT) {
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error(WARNING, "too many portals -- ignoring extra");
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return;
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}
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newportlist[i] = savestr(newfile);
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endloop:;
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}
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}
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static int
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sstrcmp(ss0, ss1)
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char **ss0, **ss1;
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{
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return(strcmp(*ss0, *ss1));
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}
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int
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gmEndPortal() /* close portal list and return GL list */
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{
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register int n;
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FORALLPORT(newportlist, n);
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if (!n) { /* free old GL list */
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if (gmPortals)
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glDeleteLists(gmPortals, Nlists);
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gmPortals = 0;
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} else
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qsort(newportlist, n, sizeof(char *), sstrcmp);
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FORALLPORT(newportlist, n) /* compare sorted lists */
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if (curportlist[n] == NULL ||
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strcmp(curportlist[n],newportlist[n])) {
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/* load new list */
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if (gmPortals)
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glDeleteLists(gmPortals, 1);
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FORALLPORT(newportlist, n);
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dolights = 0;
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domats = 0;
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gmPortals = rgl_filelist(n, newportlist, &Nlists);
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break;
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}
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FORALLPORT(curportlist, n) /* free old file list */
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freestr(curportlist[n]);
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bcopy((char *)newportlist, (char *)curportlist, sizeof(newportlist));
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bzero((char *)newportlist, sizeof(newportlist));
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return(gmPortals); /* return GL list id */
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}
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