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/* Copyright (c) 1994 Regents of the University of California */ |
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/* Copyright (c) 1997 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static LUTAB mat_tab = LU_SINIT(free,free); /* material lookup table */ |
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static LUTAB vtx_tab = LU_SINIT(free,free); /* vertex lookup table */ |
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|
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/* CIE 1931 Standard Observer */ |
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static C_COLOR cie_xf = C_CIEX; |
41 |
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static C_COLOR cie_yf = C_CIEY; |
42 |
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static C_COLOR cie_zf = C_CIEZ; |
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/* CIE 1931 Standard Observer curves */ |
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static C_COLOR cie_xf = { 1, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
41 |
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{14,42,143,435,1344,2839,3483,3362,2908,1954,956, |
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320,49,93,633,1655,2904,4334,5945,7621,9163,10263, |
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10622,10026,8544,6424,4479,2835,1649,874,468,227, |
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114,58,29,14,7,3,2,1,0}, 106836L, .467, .368, 362.230 |
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}; |
46 |
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static C_COLOR cie_yf = { 1, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
47 |
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{0,1,4,12,40,116,230,380,600,910,1390,2080,3230, |
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5030,7100,8620,9540,9950,9950,9520,8700,7570,6310, |
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5030,3810,2650,1750,1070,610,320,170,82,41,21,10, |
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5,2,1,1,0,0}, 106856L, .398, .542, 493.525 |
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}; |
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static C_COLOR cie_zf = { 1, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
53 |
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{65,201,679,2074,6456,13856,17471,17721,16692, |
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12876,8130,4652,2720,1582,782,422,203,87,39,21,17, |
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11,8,3,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, |
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106770L, .147, .077, 54.363 |
57 |
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}; |
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/* Derived CIE 1931 Primaries (imaginary) */ |
59 |
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static C_COLOR cie_xp = { 1, C_CDSPEC|C_CSSPEC|C_CSXY, |
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{-174,-198,-195,-197,-202,-213,-235,-272,-333, |
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-444,-688,-1232,-2393,-4497,-6876,-6758,-5256, |
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-3100,-815,1320,3200,4782,5998,6861,7408,7754, |
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7980,8120,8199,8240,8271,8292,8309,8283,8469, |
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8336,8336,8336,8336,8336,8336}, |
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127424L, 1., .0, |
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}; |
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static C_COLOR cie_yp = { 1, C_CDSPEC|C_CSSPEC|C_CSXY, |
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{-451,-431,-431,-430,-427,-417,-399,-366,-312, |
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-204,57,691,2142,4990,8810,9871,9122,7321,5145, |
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3023,1123,-473,-1704,-2572,-3127,-3474,-3704, |
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-3846,-3927,-3968,-3999,-4021,-4038,-4012,-4201, |
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-4066,-4066,-4066,-4066,-4066,-4066}, |
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-23035L, .0, 1., |
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}; |
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static C_COLOR cie_zp = { 1, C_CDSPEC|C_CSSPEC|C_CSXY, |
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{4051,4054,4052,4053,4054,4056,4059,4064,4071, |
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4074,4056,3967,3677,2933,1492,313,-440,-795, |
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-904,-918,-898,-884,-869,-863,-855,-855,-851, |
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-848,-847,-846,-846,-846,-845,-846,-843,-845, |
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-845,-845,-845,-845,-845}, |
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36057L, .0, .0, |
82 |
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}; |
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|
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static int setspectrum(); |
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static int setbbtemp(); |
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static void mixcolors(); |
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|
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c_ccname = NULL; |
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return(MG_OK); |
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} |
108 |
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if (!isname(av[1])) |
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return(MG_EILL); |
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lp = lu_find(&clr_tab, av[1]); /* lookup context */ |
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if (lp == NULL) |
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return(MG_EMEM); |
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case MG_E_CXY: /* assign CIE XY value */ |
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if (ac != 3) |
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return(MG_EARGC); |
151 |
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if (!isflt(av[1]) || !isflt(av[2])) |
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if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
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c_ccolor->cx = atof(av[1]); |
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c_ccolor->cy = atof(av[2]); |
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case MG_E_CSPEC: /* assign spectral values */ |
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if (ac < 5) |
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return(MG_EARGC); |
164 |
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if (!isint(av[1]) || !isint(av[2])) |
164 |
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if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
166 |
< |
return(setspectrum(c_ccolor, atoi(av[1]), atoi(av[2]), |
166 |
> |
return(setspectrum(c_ccolor, atof(av[1]), atof(av[2]), |
167 |
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ac-3, av+3)); |
168 |
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case MG_E_CCT: /* assign black body spectrum */ |
169 |
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if (ac != 2) |
170 |
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return(MG_EARGC); |
171 |
+ |
if (!isflt(av[1])) |
172 |
+ |
return(MG_ETYPE); |
173 |
+ |
return(setbbtemp(c_ccolor, atof(av[1]))); |
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case MG_E_CMIX: /* mix colors */ |
175 |
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if (ac < 5 || (ac-1)%2) |
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return(MG_EARGC); |
177 |
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if (!isflt(av[1])) |
178 |
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return(MG_ETYPE); |
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wsum = atof(av[1]); |
131 |
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if (wsum < 0.) |
132 |
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return(MG_EILL); |
180 |
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if ((lp = lu_find(&clr_tab, av[2])) == NULL) |
181 |
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return(MG_EMEM); |
182 |
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if (lp->data == NULL) |
186 |
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if (!isflt(av[i])) |
187 |
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return(MG_ETYPE); |
188 |
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w = atof(av[i]); |
142 |
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if (w < 0.) |
143 |
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return(MG_EILL); |
189 |
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if ((lp = lu_find(&clr_tab, av[i+1])) == NULL) |
190 |
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return(MG_EMEM); |
191 |
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if (lp->data == NULL) |
194 |
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w, (C_COLOR *)lp->data); |
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wsum += w; |
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} |
197 |
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if (wsum <= 0.) |
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return(MG_EILL); |
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c_ccolor->clock++; |
200 |
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return(MG_OK); |
201 |
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} |
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c_cmname = NULL; |
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return(MG_OK); |
223 |
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} |
224 |
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if (!isname(av[1])) |
225 |
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return(MG_EILL); |
226 |
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lp = lu_find(&mat_tab, av[1]); /* lookup context */ |
227 |
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if (lp == NULL) |
228 |
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return(MG_EMEM); |
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*c_cmaterial = *(C_MATERIAL *)lp->data; |
262 |
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c_cmaterial->clock = i + 1; |
263 |
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return(MG_OK); |
264 |
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case MG_E_IR: /* set index of refraction */ |
265 |
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if (ac != 3) |
266 |
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return(MG_EARGC); |
267 |
+ |
if (!isflt(av[1]) | !isflt(av[2])) |
268 |
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return(MG_ETYPE); |
269 |
+ |
c_cmaterial->nr = atof(av[1]); |
270 |
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c_cmaterial->ni = atof(av[2]); |
271 |
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if (c_cmaterial->nr <= FTINY) |
272 |
+ |
return(MG_EILL); |
273 |
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c_cmaterial->clock++; |
274 |
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return(MG_OK); |
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case MG_E_RD: /* set diffuse reflectance */ |
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if (ac != 2) |
277 |
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return(MG_EARGC); |
308 |
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case MG_E_RS: /* set specular reflectance */ |
309 |
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if (ac != 3) |
310 |
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return(MG_EARGC); |
311 |
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if (!isflt(av[1]) || !isflt(av[2])) |
311 |
> |
if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
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c_cmaterial->rs = atof(av[1]); |
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c_cmaterial->rs_a = atof(av[2]); |
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case MG_E_TS: /* set specular transmittance */ |
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if (ac != 3) |
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return(MG_EARGC); |
324 |
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if (!isflt(av[1]) || !isflt(av[2])) |
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if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
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c_cmaterial->ts = atof(av[1]); |
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c_cmaterial->ts_a = atof(av[2]); |
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c_cvname = NULL; |
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return(MG_OK); |
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} |
371 |
+ |
if (!isname(av[1])) |
372 |
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return(MG_EILL); |
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lp = lu_find(&vtx_tab, av[1]); /* lookup context */ |
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if (lp == NULL) |
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return(MG_EMEM); |
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case MG_E_POINT: /* set point */ |
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if (ac != 4) |
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return(MG_EARGC); |
413 |
< |
if (!isflt(av[1]) || !isflt(av[2]) || !isflt(av[3])) |
413 |
> |
if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3])) |
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return(MG_ETYPE); |
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c_cvertex->p[0] = atof(av[1]); |
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c_cvertex->p[1] = atof(av[2]); |
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case MG_E_NORMAL: /* set normal */ |
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if (ac != 4) |
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return(MG_EARGC); |
423 |
< |
if (!isflt(av[1]) || !isflt(av[2]) || !isflt(av[3])) |
423 |
> |
if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3])) |
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return(MG_ETYPE); |
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c_cvertex->n[0] = atof(av[1]); |
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c_cvertex->n[1] = atof(av[2]); |
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{ |
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c_uncolor = c_dfcolor; |
440 |
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c_ccolor = &c_uncolor; |
441 |
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c_ccname = NULL; |
442 |
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lu_done(&clr_tab); |
443 |
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c_unmaterial = c_dfmaterial; |
444 |
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c_cmaterial = &c_unmaterial; |
445 |
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c_cmname = NULL; |
446 |
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lu_done(&mat_tab); |
447 |
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c_unvertex = c_dfvertex; |
448 |
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c_cvertex = &c_unvertex; |
449 |
+ |
c_cvname = NULL; |
450 |
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lu_done(&vtx_tab); |
451 |
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} |
452 |
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|
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double x, y, z; |
508 |
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register int i; |
509 |
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|
510 |
< |
if (clr->flags & fl) /* already done */ |
510 |
> |
fl &= ~clr->flags; /* ignore what's done */ |
511 |
> |
if (!fl) /* everything's done! */ |
512 |
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return; |
513 |
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if (!(clr->flags & (C_CSXY|C_CSSPEC))) /* nothing set! */ |
514 |
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*clr = c_dfcolor; |
515 |
< |
else if (fl & C_CSXY) { /* cspec -> cxy */ |
515 |
> |
if (fl & C_CSXY) { /* cspec -> cxy */ |
516 |
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x = y = z = 0.; |
517 |
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for (i = 0; i < C_CNSS; i++) { |
518 |
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x += cie_xf.ssamp[i] * clr->ssamp[i]; |
519 |
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y += cie_yf.ssamp[i] * clr->ssamp[i]; |
520 |
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z += cie_zf.ssamp[i] * clr->ssamp[i]; |
521 |
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} |
522 |
+ |
x /= (double)cie_xf.ssum; |
523 |
+ |
y /= (double)cie_yf.ssum; |
524 |
+ |
z /= (double)cie_zf.ssum; |
525 |
|
z += x + y; |
526 |
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clr->cx = x / z; |
527 |
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clr->cy = y / z; |
528 |
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clr->flags |= C_CSXY; |
529 |
< |
} else { /* cxy -> cspec */ |
530 |
< |
z = (cie_xf.ssum + cie_yf.ssum + cie_zf.ssum) / 3.; |
531 |
< |
x = clr->cx * z / cie_xf.ssum; |
532 |
< |
y = clr->cy * z / cie_yf.ssum; |
464 |
< |
z = (1. - clr->cx - clr->cy) * z / cie_zf.ssum; |
529 |
> |
} else if (fl & C_CSSPEC) { /* cxy -> cspec */ |
530 |
> |
x = clr->cx; |
531 |
> |
y = clr->cy; |
532 |
> |
z = 1. - x - y; |
533 |
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clr->ssum = 0; |
534 |
< |
for (i = 0; i < C_CNSS; i++) |
535 |
< |
clr->ssum += clr->ssamp[i] = |
536 |
< |
x * cie_xf.ssamp[i] + |
537 |
< |
y * cie_yf.ssamp[i] + |
538 |
< |
z * cie_zf.ssamp[i] ; |
534 |
> |
for (i = 0; i < C_CNSS; i++) { |
535 |
> |
clr->ssamp[i] = x*cie_xp.ssamp[i] + y*cie_yp.ssamp[i] |
536 |
> |
+ z*cie_zp.ssamp[i] + .5; |
537 |
> |
if (clr->ssamp[i] < 0) /* out of gamut! */ |
538 |
> |
clr->ssamp[i] = 0; |
539 |
> |
else |
540 |
> |
clr->ssum += clr->ssamp[i]; |
541 |
> |
} |
542 |
|
clr->flags |= C_CSSPEC; |
543 |
|
} |
544 |
+ |
if (fl & C_CSEFF) { /* compute efficacy */ |
545 |
+ |
if (clr->flags & C_CSSPEC) { /* from spectrum */ |
546 |
+ |
y = 0.; |
547 |
+ |
for (i = 0; i < C_CNSS; i++) |
548 |
+ |
y += cie_yf.ssamp[i] * clr->ssamp[i]; |
549 |
+ |
clr->eff = C_CLPWM * y / clr->ssum; |
550 |
+ |
} else /* clr->flags & C_CSXY */ { /* from (x,y) */ |
551 |
+ |
clr->eff = clr->cx*cie_xf.eff + clr->cy*cie_yf.eff + |
552 |
+ |
(1. - clr->cx - clr->cy)*cie_zf.eff; |
553 |
+ |
} |
554 |
+ |
clr->flags |= C_CSEFF; |
555 |
+ |
} |
556 |
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} |
557 |
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|
558 |
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|
559 |
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static int |
560 |
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setspectrum(clr, wlmin, wlmax, ac, av) /* convert a spectrum */ |
561 |
|
register C_COLOR *clr; |
562 |
< |
int wlmin, wlmax; |
562 |
> |
double wlmin, wlmax; |
563 |
|
int ac; |
564 |
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char **av; |
565 |
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{ |
566 |
|
double scale; |
567 |
< |
float *va; |
568 |
< |
register int i; |
569 |
< |
int wl, pos; |
567 |
> |
float va[C_CNSS]; |
568 |
> |
register int i, pos; |
569 |
> |
int n, imax; |
570 |
> |
int wl; |
571 |
|
double wl0, wlstep; |
572 |
< |
|
573 |
< |
if (wlmin < C_CMINWL || wlmin >= wlmax || wlmax > C_CMAXWL) |
572 |
> |
double boxpos, boxstep; |
573 |
> |
/* check bounds */ |
574 |
> |
if (wlmax <= C_CMINWL | wlmax <= wlmin | wlmin >= C_CMAXWL) |
575 |
|
return(MG_EILL); |
576 |
< |
if ((va = (float *)malloc(ac*sizeof(float))) == NULL) |
577 |
< |
return(MG_EMEM); |
576 |
> |
wlstep = (wlmax - wlmin)/(ac-1); |
577 |
> |
while (wlmin < C_CMINWL) { |
578 |
> |
wlmin += wlstep; |
579 |
> |
ac--; av++; |
580 |
> |
} |
581 |
> |
while (wlmax > C_CMAXWL) { |
582 |
> |
wlmax -= wlstep; |
583 |
> |
ac--; |
584 |
> |
} |
585 |
> |
imax = ac; /* box filter if necessary */ |
586 |
> |
boxpos = 0; |
587 |
> |
boxstep = 1; |
588 |
> |
if (wlstep < C_CWLI) { |
589 |
> |
imax = (wlmax - wlmin)/C_CWLI + (1-FTINY); |
590 |
> |
boxpos = (wlmin - C_CMINWL)/C_CWLI; |
591 |
> |
boxstep = wlstep/C_CWLI; |
592 |
> |
wlstep = C_CWLI; |
593 |
> |
} |
594 |
|
scale = 0.; /* get values and maximum */ |
595 |
< |
for (i = 0; i < ac; i++) { |
596 |
< |
if (!isflt(av[i])) |
597 |
< |
return(MG_ETYPE); |
598 |
< |
va[i] = atof(av[i]); |
599 |
< |
if (va[i] < 0.) |
600 |
< |
return(MG_EILL); |
595 |
> |
pos = 0; |
596 |
> |
for (i = 0; i < imax; i++) { |
597 |
> |
va[i] = 0.; n = 0; |
598 |
> |
while (boxpos < i+.5 && pos < ac) { |
599 |
> |
if (!isflt(av[pos])) |
600 |
> |
return(MG_ETYPE); |
601 |
> |
va[i] += atof(av[pos++]); |
602 |
> |
n++; |
603 |
> |
boxpos += boxstep; |
604 |
> |
} |
605 |
> |
if (n > 1) |
606 |
> |
va[i] /= (double)n; |
607 |
|
if (va[i] > scale) |
608 |
|
scale = va[i]; |
609 |
+ |
else if (va[i] < -scale) |
610 |
+ |
scale = -va[i]; |
611 |
|
} |
612 |
< |
if (scale == 0.) |
612 |
> |
if (scale <= FTINY) |
613 |
|
return(MG_EILL); |
614 |
|
scale = C_CMAXV / scale; |
615 |
|
clr->ssum = 0; /* convert to our spacing */ |
616 |
|
wl0 = wlmin; |
508 |
– |
wlstep = (double)(wlmax - wlmin)/(ac-1); |
617 |
|
pos = 0; |
618 |
|
for (i = 0, wl = C_CMINWL; i < C_CNSS; i++, wl += C_CWLI) |
619 |
< |
if (wl < wlmin || wl > wlmax) |
619 |
> |
if (wl < wlmin | wl > wlmax) |
620 |
|
clr->ssamp[i] = 0; |
621 |
|
else { |
622 |
|
while (wl0 + wlstep < wl+FTINY) { |
623 |
|
wl0 += wlstep; |
624 |
|
pos++; |
625 |
|
} |
626 |
< |
if (wl+FTINY >= wl0 && wl-FTINY <= wl0) |
627 |
< |
clr->ssamp[i] = scale*va[pos]; |
626 |
> |
if (wl+FTINY >= wl0 & wl-FTINY <= wl0) |
627 |
> |
clr->ssamp[i] = scale*va[pos] + .5; |
628 |
|
else /* interpolate if necessary */ |
629 |
< |
clr->ssamp[i] = scale / wlstep * |
629 |
> |
clr->ssamp[i] = .5 + scale / wlstep * |
630 |
|
( va[pos]*(wl0+wlstep - wl) + |
631 |
|
va[pos+1]*(wl - wl0) ); |
632 |
|
clr->ssum += clr->ssamp[i]; |
633 |
|
} |
634 |
|
clr->flags = C_CDSPEC|C_CSSPEC; |
635 |
|
clr->clock++; |
528 |
– |
free((MEM_PTR)va); |
636 |
|
return(MG_OK); |
637 |
|
} |
638 |
|
|
647 |
|
register int i; |
648 |
|
|
649 |
|
if ((c1->flags|c2->flags) & C_CDSPEC) { /* spectral mixing */ |
650 |
< |
c_ccvt(c1, C_CSSPEC); |
651 |
< |
c_ccvt(c2, C_CSSPEC); |
652 |
< |
w1 /= (double)c1->ssum; |
653 |
< |
w2 /= (double)c2->ssum; |
650 |
> |
c_ccvt(c1, C_CSSPEC|C_CSEFF); |
651 |
> |
c_ccvt(c2, C_CSSPEC|C_CSEFF); |
652 |
> |
w1 /= c1->eff*c1->ssum; |
653 |
> |
w2 /= c2->eff*c2->ssum; |
654 |
|
scale = 0.; |
655 |
|
for (i = 0; i < C_CNSS; i++) { |
656 |
|
cmix[i] = w1*c1->ssamp[i] + w2*c2->ssamp[i]; |
665 |
|
} else { /* CIE xy mixing */ |
666 |
|
c_ccvt(c1, C_CSXY); |
667 |
|
c_ccvt(c2, C_CSXY); |
668 |
< |
scale = 1. / (w1/c1->cy + w2/c2->cy); |
668 |
> |
scale = w1/c1->cy + w2/c2->cy; |
669 |
> |
if (scale == 0.) |
670 |
> |
return; |
671 |
> |
scale = 1. / scale; |
672 |
|
cres->cx = (c1->cx*w1/c1->cy + c2->cx*w2/c2->cy) * scale; |
673 |
|
cres->cy = (w1 + w2) * scale; |
674 |
|
cres->flags = C_CDXY|C_CSXY; |
675 |
|
} |
676 |
|
} |
677 |
+ |
|
678 |
+ |
|
679 |
+ |
#define C1 3.741832e-16 /* W-m^2 */ |
680 |
+ |
#define C2 1.4388e-2 /* m-K */ |
681 |
+ |
|
682 |
+ |
#define bbsp(l,t) (C1/((l)*(l)*(l)*(l)*(l)*(exp(C2/((t)*(l)))-1.))) |
683 |
+ |
#define bblm(t) (C2/5./(t)) |
684 |
+ |
|
685 |
+ |
static int |
686 |
+ |
setbbtemp(clr, tk) /* set black body spectrum */ |
687 |
+ |
register C_COLOR *clr; |
688 |
+ |
double tk; |
689 |
+ |
{ |
690 |
+ |
double sf, wl; |
691 |
+ |
register int i; |
692 |
+ |
|
693 |
+ |
if (tk < 1000) |
694 |
+ |
return(MG_EILL); |
695 |
+ |
wl = bblm(tk); /* scalefactor based on peak */ |
696 |
+ |
if (wl < C_CMINWL*1e-9) |
697 |
+ |
wl = C_CMINWL*1e-9; |
698 |
+ |
else if (wl > C_CMAXWL*1e-9) |
699 |
+ |
wl = C_CMAXWL*1e-9; |
700 |
+ |
sf = C_CMAXV/bbsp(wl,tk); |
701 |
+ |
clr->ssum = 0; |
702 |
+ |
for (i = 0; i < C_CNSS; i++) { |
703 |
+ |
wl = (C_CMINWL + i*C_CWLI)*1e-9; |
704 |
+ |
clr->ssum += clr->ssamp[i] = sf*bbsp(wl,tk) + .5; |
705 |
+ |
} |
706 |
+ |
clr->flags = C_CDSPEC|C_CSSPEC; |
707 |
+ |
clr->clock++; |
708 |
+ |
return(MG_OK); |
709 |
+ |
} |
710 |
+ |
|
711 |
+ |
#undef C1 |
712 |
+ |
#undef C2 |
713 |
+ |
#undef bbsp |
714 |
+ |
#undef bblm |