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gwlarson |
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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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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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* Octree drawing operations for OpenGL driver. |
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*/ |
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#include "radogl.h" |
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#ifndef MAXOCTREE |
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#define MAXOCTREE 8 /* maximum octrees to load at once */ |
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#endif |
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static struct otEntry { |
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char *otfile; /* octree 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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} otCurrent[MAXOCTREE], otNext[MAXOCTREE]; /* current and next list */ |
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#define FORALLOCT(ot,i) for (i=0;i<MAXOCTREE&&ot[i].otfile!=NULL;i++) |
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otNewOctree(fname) /* add new octree to next list */ |
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char *fname; |
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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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FORALLOCT(otNext, i) |
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if (!strcmp(fname, otNext[i].otfile)) |
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return; |
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if (i >= MAXOCTREE) { |
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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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FORALLOCT(otCurrent, j) |
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if (!strcmp(fname, otCurrent[j].otfile)) { |
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copystruct(&otNext[i], &otCurrent[i]); |
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return; |
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} |
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/* else load new octree */ |
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otNext[i].otfile = fname; |
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dolights = 0; |
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otNext[i].listid = rgl_octlist(fname, otNext[i].cent, &otNext[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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fname, otNext[i].listid, otNext[i].rad); |
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#endif |
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} |
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otEndOctree() /* make next list current */ |
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{ |
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register int i, j; |
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FORALLOCT(otCurrent, i) { |
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FORALLOCT(otNext, j) |
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if (otNext[j].listid == otCurrent[i].listid) |
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break; |
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if (j >= MAXOCTREE || otNext[j].otfile == NULL) |
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glDeleteLists(otCurrent[i].listid, 1); /* not found */ |
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} |
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bcopy((char *)otNext, (char *)otCurrent, sizeof(otNext)); |
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otNext[0].otfile = NULL; |
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} |
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int |
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otDrawOctrees() /* draw current list of octrees */ |
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{ |
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register int i; |
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FORALLOCT(otCurrent, i) |
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glCallList(otCurrent[i].listid); |
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return(i); |
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} |
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otDepthLimit(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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FORALLOCT(otCurrent, i) { |
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VSUB(v, otCurrent[i].cent, vorg); |
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dcent = DOT(v, vdir); |
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if (dl[0] > dcent-otCurrent[i].rad) |
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dl[0] = dcent-otCurrent[i].rad; |
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if (dl[1] < dcent+otCurrent[i].rad) |
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dl[1] = dcent+otCurrent[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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} |
