| 1 |
gwlarson |
3.1 |
#ifndef lint |
| 2 |
greg |
3.4 |
static const char RCSid[] = "$Id$"; |
| 3 |
gwlarson |
3.1 |
#endif |
| 4 |
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/* |
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* Convert Radiance -> OpenGL surfaces. |
| 6 |
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*/ |
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greg |
3.5 |
#include "copyright.h" |
| 9 |
greg |
3.4 |
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| 10 |
gwlarson |
3.1 |
#include "radogl.h" |
| 11 |
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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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| 19 |
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MATREC *curmat = NULL; /* current material */ |
| 20 |
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| 21 |
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static int curpolysize = 0; /* outputting triangles/quads */ |
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| 23 |
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static GLUquadricObj *gluqo; /* shared quadric object */ |
| 24 |
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static GLUtesselator *gluto; /* shared tessallation object */ |
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| 26 |
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static char *glu_rout = "unk"; /* active GLU routine */ |
| 27 |
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| 28 |
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#define NOPOLY() if (curpolysize) {glEnd(); curpolysize = 0;} else |
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| 31 |
greg |
3.4 |
void |
| 32 |
gwlarson |
3.1 |
setmaterial(mp, cent, ispoly) /* prepare for new material */ |
| 33 |
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register MATREC *mp; |
| 34 |
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FVECT cent; |
| 35 |
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int ispoly; |
| 36 |
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{ |
| 37 |
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if (mp != curmat && domats) { |
| 38 |
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NOPOLY(); |
| 39 |
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domatobj(curmat = mp, cent); |
| 40 |
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} else if (!ispoly) |
| 41 |
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NOPOLY(); |
| 42 |
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} |
| 43 |
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double |
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polyarea(cent, norm, n, v) /* compute polygon area & normal */ |
| 47 |
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FVECT cent, norm; /* returned center and normal */ |
| 48 |
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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; |
| 52 |
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double d; |
| 53 |
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register int i; |
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| 55 |
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norm[0] = norm[1] = norm[2] = 0.; |
| 56 |
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v1[0] = v[1][0] - v[0][0]; |
| 57 |
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v1[1] = v[1][1] - v[0][1]; |
| 58 |
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v1[2] = v[1][2] - v[0][2]; |
| 59 |
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for (i = 2; i < n; i++) { |
| 60 |
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v2[0] = v[i][0] - v[0][0]; |
| 61 |
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v2[1] = v[i][1] - v[0][1]; |
| 62 |
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v2[2] = v[i][2] - v[0][2]; |
| 63 |
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fcross(v3, v1, v2); |
| 64 |
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norm[0] += v3[0]; |
| 65 |
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norm[1] += v3[1]; |
| 66 |
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norm[2] += v3[2]; |
| 67 |
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VCOPY(v1, v2); |
| 68 |
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} |
| 69 |
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if (cent != NULL) { /* compute center also */ |
| 70 |
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cent[0] = cent[1] = cent[2] = 0.; |
| 71 |
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for (i = n; i--; ) { |
| 72 |
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cent[0] += v[i][0]; |
| 73 |
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cent[1] += v[i][1]; |
| 74 |
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cent[2] += v[i][2]; |
| 75 |
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} |
| 76 |
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d = 1./n; |
| 77 |
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cent[0] *= d; cent[1] *= d; cent[2] *= d; |
| 78 |
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} |
| 79 |
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return(normalize(norm)*.5); |
| 80 |
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} |
| 81 |
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| 82 |
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| 83 |
greg |
3.4 |
static void |
| 84 |
gwlarson |
3.2 |
glu_error(en) /* report an error as a warning */ |
| 85 |
gwlarson |
3.1 |
GLenum en; |
| 86 |
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{ |
| 87 |
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sprintf(errmsg, "GLU error %s: %s", glu_rout, gluErrorString(en)); |
| 88 |
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error(WARNING, errmsg); |
| 89 |
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} |
| 90 |
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| 91 |
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| 92 |
gwlarson |
3.3 |
static void |
| 93 |
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myCombine(coords, vertex_data, weight, dataOut) |
| 94 |
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register GLdouble coords[3]; |
| 95 |
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GLdouble *vertex_data[4]; |
| 96 |
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GLfloat weight[4]; |
| 97 |
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GLdouble **dataOut; |
| 98 |
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{ |
| 99 |
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register GLdouble *newvert; |
| 100 |
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| 101 |
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newvert = (GLdouble *)malloc(3*sizeof(GLdouble)); |
| 102 |
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if (newvert == NULL) |
| 103 |
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error(SYSTEM, "out of memory in myCombine"); |
| 104 |
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VCOPY(newvert, coords); /* no data, just coordinates */ |
| 105 |
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*dataOut = newvert; |
| 106 |
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} |
| 107 |
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| 108 |
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| 109 |
gwlarson |
3.1 |
static |
| 110 |
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newtess() /* allocate GLU tessellation object */ |
| 111 |
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{ |
| 112 |
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if ((gluto = gluNewTess()) == NULL) |
| 113 |
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error(INTERNAL, "gluNewTess failed"); |
| 114 |
greg |
3.4 |
gluTessCallback(gluto, GLU_TESS_BEGIN, (_GLUfuncptr)glBegin); |
| 115 |
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gluTessCallback(gluto, GLU_TESS_VERTEX, (_GLUfuncptr)glVertex3dv); |
| 116 |
gwlarson |
3.1 |
gluTessCallback(gluto, GLU_TESS_END, glEnd); |
| 117 |
gwlarson |
3.3 |
gluTessCallback(gluto, GLU_TESS_COMBINE, myCombine); |
| 118 |
gwlarson |
3.1 |
gluTessCallback(gluto, GLU_TESS_ERROR, glu_error); |
| 119 |
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gluTessProperty(gluto, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_NONZERO); |
| 120 |
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} |
| 121 |
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| 122 |
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| 123 |
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static |
| 124 |
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newquadric() /* allocate GLU quadric structure */ |
| 125 |
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{ |
| 126 |
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if ((gluqo = gluNewQuadric()) == NULL) |
| 127 |
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error(INTERNAL, "gluNewQuadric failed"); |
| 128 |
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gluQuadricDrawStyle(gluqo, GLU_FILL); |
| 129 |
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gluQuadricCallback(gluqo, GLU_ERROR, glu_error); |
| 130 |
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} |
| 131 |
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| 132 |
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| 133 |
greg |
3.4 |
int |
| 134 |
gwlarson |
3.1 |
o_face(o) /* convert a face */ |
| 135 |
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register OBJREC *o; |
| 136 |
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{ |
| 137 |
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double area; |
| 138 |
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FVECT norm, cent; |
| 139 |
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register int i; |
| 140 |
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| 141 |
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if (o->oargs.nfargs < 9 | o->oargs.nfargs % 3) |
| 142 |
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objerror(o, USER, "bad # real arguments"); |
| 143 |
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area = polyarea(cent, norm, o->oargs.nfargs/3, (FVECT *)o->oargs.farg); |
| 144 |
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if (area <= FTINY) |
| 145 |
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return; |
| 146 |
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if (dolights) /* check for source */ |
| 147 |
greg |
3.4 |
doflatsrc((MATREC *)o->os, cent, norm, area); |
| 148 |
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setmaterial((MATREC *)o->os, cent, 1); /* set material */ |
| 149 |
gwlarson |
3.1 |
if (o->oargs.nfargs/3 != curpolysize) { |
| 150 |
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if (curpolysize) glEnd(); |
| 151 |
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curpolysize = o->oargs.nfargs/3; |
| 152 |
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if (curpolysize == 3) |
| 153 |
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glBegin(GL_TRIANGLES); |
| 154 |
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else if (curpolysize == 4) |
| 155 |
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glBegin(GL_QUADS); |
| 156 |
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} |
| 157 |
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glNormal3d((GLdouble)norm[0], (GLdouble)norm[1], (GLdouble)norm[2]); |
| 158 |
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if (curpolysize > 4) { |
| 159 |
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if (gluto == NULL) newtess(); |
| 160 |
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glu_rout = "tessellating polygon"; |
| 161 |
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gluTessNormal(gluto, (GLdouble)norm[0], |
| 162 |
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(GLdouble)norm[1], (GLdouble)norm[2]); |
| 163 |
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gluTessBeginPolygon(gluto, NULL); |
| 164 |
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gluTessBeginContour(gluto); |
| 165 |
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#ifdef SMLFLT |
| 166 |
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error(INTERNAL, "bad code segment in o_face"); |
| 167 |
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#endif |
| 168 |
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for (i = 0; i < curpolysize; i++) |
| 169 |
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gluTessVertex(gluto, (GLdouble *)(o->oargs.farg+3*i), |
| 170 |
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(void *)(o->oargs.farg+3*i)); |
| 171 |
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gluTessEndContour(gluto); |
| 172 |
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gluTessEndPolygon(gluto); |
| 173 |
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curpolysize = 0; |
| 174 |
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} else { |
| 175 |
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for (i = 0; i < curpolysize; i++) |
| 176 |
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glVertex3d((GLdouble)o->oargs.farg[3*i], |
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(GLdouble)o->oargs.farg[3*i+1], |
| 178 |
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(GLdouble)o->oargs.farg[3*i+2]); |
| 179 |
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} |
| 180 |
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} |
| 181 |
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| 182 |
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| 183 |
greg |
3.4 |
void |
| 184 |
gwlarson |
3.1 |
surfclean() /* clean up surface routines */ |
| 185 |
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{ |
| 186 |
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setmaterial(NULL, NULL, 0); |
| 187 |
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if (gluqo != NULL) { |
| 188 |
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gluDeleteQuadric(gluqo); |
| 189 |
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gluqo = NULL; |
| 190 |
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} |
| 191 |
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if (gluto != NULL) { |
| 192 |
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gluDeleteTess(gluto); |
| 193 |
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gluto = NULL; |
| 194 |
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} |
| 195 |
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rgl_checkerr("in surfclean"); |
| 196 |
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} |
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| 198 |
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greg |
3.4 |
int |
| 200 |
gwlarson |
3.1 |
o_sphere(o) /* convert a sphere */ |
| 201 |
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register OBJREC *o; |
| 202 |
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{ |
| 203 |
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/* check arguments */ |
| 204 |
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if (o->oargs.nfargs != 4) |
| 205 |
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objerror(o, USER, "bad # real arguments"); |
| 206 |
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if (o->oargs.farg[3] < -FTINY) { |
| 207 |
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o->otype = o->otype==OBJ_SPHERE ? OBJ_BUBBLE : OBJ_SPHERE; |
| 208 |
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o->oargs.farg[3] = -o->oargs.farg[3]; |
| 209 |
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} else if (o->oargs.farg[3] <= FTINY) |
| 210 |
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return; |
| 211 |
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if (dolights) |
| 212 |
greg |
3.4 |
dosphsrc((MATREC *)o->os, o->oargs.farg, |
| 213 |
gwlarson |
3.1 |
PI*o->oargs.farg[3]*o->oargs.farg[3]); |
| 214 |
greg |
3.4 |
setmaterial((MATREC *)o->os, o->oargs.farg, 0); |
| 215 |
gwlarson |
3.1 |
if (gluqo == NULL) newquadric(); |
| 216 |
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glu_rout = "making sphere"; |
| 217 |
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gluQuadricOrientation(gluqo, |
| 218 |
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o->otype==OBJ_BUBBLE ? GLU_INSIDE : GLU_OUTSIDE); |
| 219 |
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gluQuadricNormals(gluqo, GLU_SMOOTH); |
| 220 |
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glMatrixMode(GL_MODELVIEW); |
| 221 |
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glPushMatrix(); |
| 222 |
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glTranslated((GLdouble)o->oargs.farg[0], (GLdouble)o->oargs.farg[1], |
| 223 |
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(GLdouble)o->oargs.farg[2]); |
| 224 |
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gluSphere(gluqo, (GLdouble)o->oargs.farg[3], NSLICES, NSTACKS); |
| 225 |
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glPopMatrix(); |
| 226 |
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} |
| 227 |
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| 228 |
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| 229 |
greg |
3.4 |
int |
| 230 |
gwlarson |
3.1 |
o_cone(o) /* convert a cone or cylinder */ |
| 231 |
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register OBJREC *o; |
| 232 |
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{ |
| 233 |
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double x1, y1, h, d; |
| 234 |
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FVECT cent; |
| 235 |
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register int iscyl; |
| 236 |
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| 237 |
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iscyl = o->otype==OBJ_CYLINDER | o->otype==OBJ_TUBE; |
| 238 |
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if (o->oargs.nfargs != (iscyl ? 7 : 8)) |
| 239 |
greg |
3.4 |
objerror(o, USER, "bad # real arguments"); |
| 240 |
gwlarson |
3.1 |
if (o->oargs.farg[6] < -FTINY) { |
| 241 |
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o->oargs.farg[6] = -o->oargs.farg[6]; |
| 242 |
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if (iscyl) |
| 243 |
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o->otype = o->otype==OBJ_CYLINDER ? |
| 244 |
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OBJ_TUBE : OBJ_CYLINDER; |
| 245 |
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else { |
| 246 |
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if ((o->oargs.farg[7] = -o->oargs.farg[7]) < -FTINY) |
| 247 |
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objerror(o, USER, "illegal radii"); |
| 248 |
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o->otype = o->otype==OBJ_CONE ? OBJ_CUP : OBJ_CONE; |
| 249 |
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} |
| 250 |
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} else if (!iscyl && o->oargs.farg[7] < -FTINY) |
| 251 |
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objerror(o, USER, "illegal radii"); |
| 252 |
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if (o->oargs.farg[6] <= FTINY && (iscyl || o->oargs.farg[7] <= FTINY)) |
| 253 |
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return; |
| 254 |
gwlarson |
3.3 |
if (!iscyl) { |
| 255 |
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if (o->oargs.farg[6] < 0.) /* complains for tiny neg's */ |
| 256 |
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o->oargs.farg[6] = 0.; |
| 257 |
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if (o->oargs.farg[7] < 0.) |
| 258 |
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o->oargs.farg[7] = 0.; |
| 259 |
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} |
| 260 |
gwlarson |
3.1 |
cent[0] = .5*(o->oargs.farg[0] + o->oargs.farg[3]); |
| 261 |
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cent[1] = .5*(o->oargs.farg[1] + o->oargs.farg[4]); |
| 262 |
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cent[2] = .5*(o->oargs.farg[2] + o->oargs.farg[5]); |
| 263 |
greg |
3.4 |
setmaterial((MATREC *)o->os, cent, 0); |
| 264 |
gwlarson |
3.1 |
if (gluqo == NULL) newquadric(); |
| 265 |
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glu_rout = "making cylinder"; |
| 266 |
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gluQuadricOrientation(gluqo, o->otype==OBJ_CUP | o->otype==OBJ_TUBE ? |
| 267 |
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GLU_INSIDE : GLU_OUTSIDE); |
| 268 |
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gluQuadricNormals(gluqo, GLU_SMOOTH); |
| 269 |
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glMatrixMode(GL_MODELVIEW); |
| 270 |
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glPushMatrix(); |
| 271 |
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/* do base translation */ |
| 272 |
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glTranslated((GLdouble)o->oargs.farg[0], (GLdouble)o->oargs.farg[1], |
| 273 |
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(GLdouble)o->oargs.farg[2]); |
| 274 |
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/* compute height & rotation angle */ |
| 275 |
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h = sqrt(dist2(o->oargs.farg,o->oargs.farg+3)); |
| 276 |
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if (h <= FTINY) |
| 277 |
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return; |
| 278 |
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x1 = o->oargs.farg[1] - o->oargs.farg[4]; |
| 279 |
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y1 = o->oargs.farg[3] - o->oargs.farg[0]; |
| 280 |
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/* z1 = 0; */ |
| 281 |
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d = 180./PI * asin(sqrt(x1*x1 + y1*y1) / h); |
| 282 |
|
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if (o->oargs.farg[5] < o->oargs.farg[2]) |
| 283 |
|
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d = 180. - d; |
| 284 |
|
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if (d > FTINY) |
| 285 |
|
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glRotated(d, (GLdouble)x1, (GLdouble)y1, 0.); |
| 286 |
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gluCylinder(gluqo, o->oargs.farg[6], o->oargs.farg[iscyl ? 6 : 7], |
| 287 |
|
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h, NSLICES, 1); |
| 288 |
|
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glPopMatrix(); |
| 289 |
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} |
| 290 |
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| 291 |
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| 292 |
greg |
3.4 |
int |
| 293 |
gwlarson |
3.1 |
o_ring(o) /* convert a ring */ |
| 294 |
|
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register OBJREC *o; |
| 295 |
|
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{ |
| 296 |
|
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double x1, y1, d; |
| 297 |
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| 298 |
|
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if (o->oargs.nfargs != 8) |
| 299 |
greg |
3.4 |
objerror(o, USER, "bad # real arguments"); |
| 300 |
gwlarson |
3.1 |
if (o->oargs.farg[7] < o->oargs.farg[6]) { |
| 301 |
|
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register double d = o->oargs.farg[7]; |
| 302 |
|
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o->oargs.farg[7] = o->oargs.farg[6]; |
| 303 |
|
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o->oargs.farg[6] = d; |
| 304 |
|
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} |
| 305 |
|
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if (o->oargs.farg[6] < -FTINY) |
| 306 |
|
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objerror(o, USER, "negative radius"); |
| 307 |
|
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if (o->oargs.farg[6] < 0.) /* complains for tiny neg's */ |
| 308 |
|
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o->oargs.farg[6] = 0.; |
| 309 |
|
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if (o->oargs.farg[7] - o->oargs.farg[6] <= FTINY) |
| 310 |
|
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return; |
| 311 |
|
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if (dolights) |
| 312 |
greg |
3.4 |
doflatsrc((MATREC *)o->os, o->oargs.farg, o->oargs.farg+3, |
| 313 |
gwlarson |
3.1 |
PI*(o->oargs.farg[7]*o->oargs.farg[7] - |
| 314 |
|
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o->oargs.farg[6]*o->oargs.farg[6])); |
| 315 |
greg |
3.4 |
setmaterial((MATREC *)o->os, o->oargs.farg, 0); |
| 316 |
gwlarson |
3.1 |
if (gluqo == NULL) newquadric(); |
| 317 |
|
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glu_rout = "making disk"; |
| 318 |
|
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gluQuadricOrientation(gluqo, GLU_OUTSIDE); |
| 319 |
|
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gluQuadricNormals(gluqo, GLU_FLAT); |
| 320 |
|
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glMatrixMode(GL_MODELVIEW); |
| 321 |
|
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glPushMatrix(); |
| 322 |
|
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glTranslated((GLdouble)o->oargs.farg[0], (GLdouble)o->oargs.farg[1], |
| 323 |
|
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(GLdouble)o->oargs.farg[2]); |
| 324 |
|
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/* compute rotation angle */ |
| 325 |
|
|
d = VLEN(o->oargs.farg+3); |
| 326 |
|
|
if (d <= FTINY) |
| 327 |
|
|
return; |
| 328 |
|
|
x1 = -o->oargs.farg[4]; |
| 329 |
|
|
y1 = o->oargs.farg[3]; |
| 330 |
|
|
/* z1 = 0; */ |
| 331 |
|
|
d = 180./PI * asin(sqrt(x1*x1 + y1*y1) / d); |
| 332 |
|
|
if (o->oargs.farg[5] < 0.) |
| 333 |
|
|
d = 180. - d; |
| 334 |
|
|
if (d > FTINY) |
| 335 |
|
|
glRotated(d, (GLdouble)x1, (GLdouble)y1, 0.); |
| 336 |
|
|
gluDisk(gluqo, o->oargs.farg[6], o->oargs.farg[7], NSLICES, 1); |
| 337 |
|
|
glPopMatrix(); |
| 338 |
|
|
} |
