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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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|
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/* |
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* Geometry drawing operations for OpenGL driver. |
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*/ |
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|
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#include "radogl.h" |
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#include "rhdriver.h" |
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|
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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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|
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int gmPortals = 0; /* current portal GL list id */ |
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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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|
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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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} gmCurrent[MAXGEO], gmNext[MAXGEO]; /* current and next list */ |
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|
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#define FORALLGEOM(ot,i) for (i=0;i<MAXGEO&&ot[i].gfile!=NULL;i++) |
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|
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#define FORALLPORT(pl,i) for (i=0;i<MAXPORT&&pl[i]!=NULL;i++) |
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|
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extern char *atos(), *sskip(), *sskip2(); |
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|
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|
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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 = 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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#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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|
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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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|
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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, 1); /* not found */ |
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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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|
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|
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int |
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gmDrawGeom(clearports) /* draw current list of octrees (and ports) */ |
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int clearports; |
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{ |
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register int n; |
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|
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FORALLGEOM(gmCurrent, n) |
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glCallList(gmCurrent[n].listid); |
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if (!n | !clearports | !gmPortals) |
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return(n); |
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/* mark alpha channel over the portals */ |
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glPushAttrib(GL_DEPTH_BUFFER_BIT|GL_COLOR_BUFFER_BIT); |
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glDepthMask(GL_FALSE); |
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glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE); |
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glClear(GL_COLOR_BUFFER_BIT); |
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glColor4ub(0, 0, 0, 0xff); /* write alpha buffer as mask */ |
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glCallList(gmPortals); /* draw them portals */ |
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glPopAttrib(); |
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return(n); |
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} |
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|
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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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|
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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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|
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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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|
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if (pflist == NULL) |
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return; |
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while (*pflist) { |
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atos(newfile, sizeof(newfile), pflist); |
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if (!*newfile) |
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break; |
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pflist = sskip(pflist); |
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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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|
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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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|
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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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|
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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, 1); |
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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); |
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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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} |
