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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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* Convert Radiance -> OpenGL surfaces. |
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*/ |
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|
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#include "radogl.h" |
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|
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#ifndef NSLICES |
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#define NSLICES 18 /* number of quadric slices */ |
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#endif |
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#ifndef NSTACKS |
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#define NSTACKS 10 /* number of quadric stacks */ |
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#endif |
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|
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MATREC *curmat = NULL; /* current material */ |
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|
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static int curpolysize = 0; /* outputting triangles/quads */ |
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|
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static GLUquadricObj *gluqo; /* shared quadric object */ |
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static GLUtesselator *gluto; /* shared tessallation object */ |
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|
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static char *glu_rout = "unk"; /* active GLU routine */ |
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|
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#define NOPOLY() if (curpolysize) {glEnd(); curpolysize = 0;} else |
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|
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|
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setmaterial(mp, cent, ispoly) /* prepare for new material */ |
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register MATREC *mp; |
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FVECT cent; |
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int ispoly; |
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{ |
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if (mp != curmat && domats) { |
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NOPOLY(); |
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domatobj(curmat = mp, cent); |
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} else if (!ispoly) |
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NOPOLY(); |
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} |
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|
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|
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double |
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polyarea(cent, norm, n, v) /* compute polygon area & normal */ |
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FVECT cent, norm; /* returned center and normal */ |
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int n; /* number of vertices */ |
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register FVECT v[]; /* vertex list */ |
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{ |
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FVECT v1, v2, v3; |
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double d; |
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register int i; |
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|
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norm[0] = norm[1] = norm[2] = 0.; |
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v1[0] = v[1][0] - v[0][0]; |
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v1[1] = v[1][1] - v[0][1]; |
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v1[2] = v[1][2] - v[0][2]; |
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for (i = 2; i < n; i++) { |
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v2[0] = v[i][0] - v[0][0]; |
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v2[1] = v[i][1] - v[0][1]; |
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v2[2] = v[i][2] - v[0][2]; |
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fcross(v3, v1, v2); |
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norm[0] += v3[0]; |
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norm[1] += v3[1]; |
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norm[2] += v3[2]; |
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VCOPY(v1, v2); |
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} |
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if (cent != NULL) { /* compute center also */ |
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cent[0] = cent[1] = cent[2] = 0.; |
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for (i = n; i--; ) { |
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cent[0] += v[i][0]; |
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cent[1] += v[i][1]; |
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cent[2] += v[i][2]; |
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} |
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d = 1./n; |
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cent[0] *= d; cent[1] *= d; cent[2] *= d; |
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} |
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return(normalize(norm)*.5); |
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} |
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|
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|
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static |
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glu_error(en) /* report an error as a warning */ |
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GLenum en; |
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{ |
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sprintf(errmsg, "GLU error %s: %s", glu_rout, gluErrorString(en)); |
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error(WARNING, errmsg); |
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} |
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|
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|
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static void |
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myCombine(coords, vertex_data, weight, dataOut) |
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register GLdouble coords[3]; |
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GLdouble *vertex_data[4]; |
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GLfloat weight[4]; |
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GLdouble **dataOut; |
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{ |
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register GLdouble *newvert; |
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|
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newvert = (GLdouble *)malloc(3*sizeof(GLdouble)); |
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if (newvert == NULL) |
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error(SYSTEM, "out of memory in myCombine"); |
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VCOPY(newvert, coords); /* no data, just coordinates */ |
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*dataOut = newvert; |
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} |
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|
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|
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static |
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newtess() /* allocate GLU tessellation object */ |
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{ |
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if ((gluto = gluNewTess()) == NULL) |
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error(INTERNAL, "gluNewTess failed"); |
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gluTessCallback(gluto, GLU_TESS_BEGIN, glBegin); |
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gluTessCallback(gluto, GLU_TESS_VERTEX, glVertex3dv); |
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gluTessCallback(gluto, GLU_TESS_END, glEnd); |
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gluTessCallback(gluto, GLU_TESS_COMBINE, myCombine); |
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gluTessCallback(gluto, GLU_TESS_ERROR, glu_error); |
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gluTessProperty(gluto, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_NONZERO); |
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} |
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|
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|
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static |
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newquadric() /* allocate GLU quadric structure */ |
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{ |
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if ((gluqo = gluNewQuadric()) == NULL) |
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error(INTERNAL, "gluNewQuadric failed"); |
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gluQuadricDrawStyle(gluqo, GLU_FILL); |
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gluQuadricCallback(gluqo, GLU_ERROR, glu_error); |
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} |
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|
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|
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o_face(o) /* convert a face */ |
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register OBJREC *o; |
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{ |
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double area; |
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FVECT norm, cent; |
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register int i; |
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|
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if (o->oargs.nfargs < 9 | o->oargs.nfargs % 3) |
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objerror(o, USER, "bad # real arguments"); |
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area = polyarea(cent, norm, o->oargs.nfargs/3, (FVECT *)o->oargs.farg); |
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if (area <= FTINY) |
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return; |
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if (dolights) /* check for source */ |
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doflatsrc(o->os, cent, norm, area); |
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setmaterial(o->os, cent, 1); /* set material */ |
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if (o->oargs.nfargs/3 != curpolysize) { |
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if (curpolysize) glEnd(); |
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curpolysize = o->oargs.nfargs/3; |
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if (curpolysize == 3) |
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glBegin(GL_TRIANGLES); |
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else if (curpolysize == 4) |
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glBegin(GL_QUADS); |
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} |
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glNormal3d((GLdouble)norm[0], (GLdouble)norm[1], (GLdouble)norm[2]); |
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if (curpolysize > 4) { |
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if (gluto == NULL) newtess(); |
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glu_rout = "tessellating polygon"; |
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gluTessNormal(gluto, (GLdouble)norm[0], |
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(GLdouble)norm[1], (GLdouble)norm[2]); |
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gluTessBeginPolygon(gluto, NULL); |
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gluTessBeginContour(gluto); |
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#ifdef SMLFLT |
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error(INTERNAL, "bad code segment in o_face"); |
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#endif |
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for (i = 0; i < curpolysize; i++) |
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gluTessVertex(gluto, (GLdouble *)(o->oargs.farg+3*i), |
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(void *)(o->oargs.farg+3*i)); |
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gluTessEndContour(gluto); |
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gluTessEndPolygon(gluto); |
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curpolysize = 0; |
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} else { |
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for (i = 0; i < curpolysize; i++) |
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glVertex3d((GLdouble)o->oargs.farg[3*i], |
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(GLdouble)o->oargs.farg[3*i+1], |
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(GLdouble)o->oargs.farg[3*i+2]); |
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} |
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} |
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|
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|
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surfclean() /* clean up surface routines */ |
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{ |
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setmaterial(NULL, NULL, 0); |
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if (gluqo != NULL) { |
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gluDeleteQuadric(gluqo); |
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gluqo = NULL; |
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} |
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if (gluto != NULL) { |
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gluDeleteTess(gluto); |
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gluto = NULL; |
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} |
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rgl_checkerr("in surfclean"); |
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} |
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|
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|
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o_sphere(o) /* convert a sphere */ |
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register OBJREC *o; |
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{ |
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/* check arguments */ |
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if (o->oargs.nfargs != 4) |
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objerror(o, USER, "bad # real arguments"); |
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if (o->oargs.farg[3] < -FTINY) { |
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o->otype = o->otype==OBJ_SPHERE ? OBJ_BUBBLE : OBJ_SPHERE; |
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o->oargs.farg[3] = -o->oargs.farg[3]; |
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} else if (o->oargs.farg[3] <= FTINY) |
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return; |
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if (dolights) |
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dosphsrc(o->os, o->oargs.farg, |
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PI*o->oargs.farg[3]*o->oargs.farg[3]); |
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setmaterial(o->os, o->oargs.farg, 0); |
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if (gluqo == NULL) newquadric(); |
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glu_rout = "making sphere"; |
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gluQuadricOrientation(gluqo, |
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o->otype==OBJ_BUBBLE ? GLU_INSIDE : GLU_OUTSIDE); |
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gluQuadricNormals(gluqo, GLU_SMOOTH); |
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glMatrixMode(GL_MODELVIEW); |
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glPushMatrix(); |
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glTranslated((GLdouble)o->oargs.farg[0], (GLdouble)o->oargs.farg[1], |
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(GLdouble)o->oargs.farg[2]); |
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gluSphere(gluqo, (GLdouble)o->oargs.farg[3], NSLICES, NSTACKS); |
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glPopMatrix(); |
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} |
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|
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|
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o_cone(o) /* convert a cone or cylinder */ |
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register OBJREC *o; |
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{ |
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double x1, y1, h, d; |
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FVECT cent; |
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register int iscyl; |
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|
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iscyl = o->otype==OBJ_CYLINDER | o->otype==OBJ_TUBE; |
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if (o->oargs.nfargs != (iscyl ? 7 : 8)) |
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objerror(o, "bad # real arguments"); |
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if (o->oargs.farg[6] < -FTINY) { |
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o->oargs.farg[6] = -o->oargs.farg[6]; |
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if (iscyl) |
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o->otype = o->otype==OBJ_CYLINDER ? |
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OBJ_TUBE : OBJ_CYLINDER; |
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else { |
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if ((o->oargs.farg[7] = -o->oargs.farg[7]) < -FTINY) |
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objerror(o, USER, "illegal radii"); |
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o->otype = o->otype==OBJ_CONE ? OBJ_CUP : OBJ_CONE; |
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} |
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} else if (!iscyl && o->oargs.farg[7] < -FTINY) |
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objerror(o, USER, "illegal radii"); |
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if (o->oargs.farg[6] <= FTINY && (iscyl || o->oargs.farg[7] <= FTINY)) |
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return; |
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if (!iscyl) { |
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if (o->oargs.farg[6] < 0.) /* complains for tiny neg's */ |
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o->oargs.farg[6] = 0.; |
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if (o->oargs.farg[7] < 0.) |
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o->oargs.farg[7] = 0.; |
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} |
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cent[0] = .5*(o->oargs.farg[0] + o->oargs.farg[3]); |
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cent[1] = .5*(o->oargs.farg[1] + o->oargs.farg[4]); |
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cent[2] = .5*(o->oargs.farg[2] + o->oargs.farg[5]); |
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setmaterial(o->os, cent, 0); |
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if (gluqo == NULL) newquadric(); |
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glu_rout = "making cylinder"; |
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gluQuadricOrientation(gluqo, o->otype==OBJ_CUP | o->otype==OBJ_TUBE ? |
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GLU_INSIDE : GLU_OUTSIDE); |
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gluQuadricNormals(gluqo, GLU_SMOOTH); |
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glMatrixMode(GL_MODELVIEW); |
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glPushMatrix(); |
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/* do base translation */ |
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glTranslated((GLdouble)o->oargs.farg[0], (GLdouble)o->oargs.farg[1], |
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(GLdouble)o->oargs.farg[2]); |
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/* compute height & rotation angle */ |
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h = sqrt(dist2(o->oargs.farg,o->oargs.farg+3)); |
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if (h <= FTINY) |
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return; |
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x1 = o->oargs.farg[1] - o->oargs.farg[4]; |
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y1 = o->oargs.farg[3] - o->oargs.farg[0]; |
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/* z1 = 0; */ |
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d = 180./PI * asin(sqrt(x1*x1 + y1*y1) / h); |
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if (o->oargs.farg[5] < o->oargs.farg[2]) |
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d = 180. - d; |
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if (d > FTINY) |
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glRotated(d, (GLdouble)x1, (GLdouble)y1, 0.); |
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gluCylinder(gluqo, o->oargs.farg[6], o->oargs.farg[iscyl ? 6 : 7], |
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h, NSLICES, 1); |
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glPopMatrix(); |
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} |
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|
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|
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o_ring(o) /* convert a ring */ |
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register OBJREC *o; |
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{ |
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double x1, y1, d; |
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|
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if (o->oargs.nfargs != 8) |
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objerror(o, "bad # real arguments"); |
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if (o->oargs.farg[7] < o->oargs.farg[6]) { |
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register double d = o->oargs.farg[7]; |
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o->oargs.farg[7] = o->oargs.farg[6]; |
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o->oargs.farg[6] = d; |
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} |
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if (o->oargs.farg[6] < -FTINY) |
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objerror(o, USER, "negative radius"); |
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if (o->oargs.farg[6] < 0.) /* complains for tiny neg's */ |
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o->oargs.farg[6] = 0.; |
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if (o->oargs.farg[7] - o->oargs.farg[6] <= FTINY) |
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return; |
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if (dolights) |
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doflatsrc(o->os, o->oargs.farg, o->oargs.farg+3, |
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PI*(o->oargs.farg[7]*o->oargs.farg[7] - |
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o->oargs.farg[6]*o->oargs.farg[6])); |
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setmaterial(o->os, o->oargs.farg, 0); |
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if (gluqo == NULL) newquadric(); |
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glu_rout = "making disk"; |
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gluQuadricOrientation(gluqo, GLU_OUTSIDE); |
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gluQuadricNormals(gluqo, GLU_FLAT); |
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glMatrixMode(GL_MODELVIEW); |
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glPushMatrix(); |
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glTranslated((GLdouble)o->oargs.farg[0], (GLdouble)o->oargs.farg[1], |
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(GLdouble)o->oargs.farg[2]); |
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/* compute rotation angle */ |
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d = VLEN(o->oargs.farg+3); |
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if (d <= FTINY) |
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return; |
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x1 = -o->oargs.farg[4]; |
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y1 = o->oargs.farg[3]; |
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/* z1 = 0; */ |
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d = 180./PI * asin(sqrt(x1*x1 + y1*y1) / d); |
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if (o->oargs.farg[5] < 0.) |
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d = 180. - d; |
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if (d > FTINY) |
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glRotated(d, (GLdouble)x1, (GLdouble)y1, 0.); |
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gluDisk(gluqo, o->oargs.farg[6], o->oargs.farg[7], NSLICES, 1); |
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glPopMatrix(); |
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} |
