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gwlarson |
3.1 |
#ifndef lint |
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greg |
3.3 |
static const char RCSid[] = "$Id$"; |
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gwlarson |
3.1 |
#endif |
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/* |
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* Routines for handling OpenGL light sources |
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*/ |
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greg |
3.3 |
/* ==================================================================== |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, |
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* if any, must include the following acknowledgment: |
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* "This product includes Radiance software |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
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* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
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* <http://www.lbl.gov/>. |
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*/ |
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gwlarson |
3.1 |
#include "radogl.h" |
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double expval = 0.; /* global exposure value */ |
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COLOR ambval = {0.2, 0.2, 0.2}; /* global ambient value */ |
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int dolights = MAXLIGHTS; /* do how many more light sources? */ |
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gwlarson |
3.2 |
int glightid[MAXLIGHTS] = {GL_LIGHT0, GL_LIGHT1, GL_LIGHT2, |
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gwlarson |
3.1 |
GL_LIGHT3, GL_LIGHT4, GL_LIGHT5, GL_LIGHT6, GL_LIGHT7}; |
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static int lightlist; /* light list id */ |
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/* source types */ |
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#define L_NONE 0 |
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#define L_SOURCE 1 |
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#define L_FLAT 2 |
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#define L_SPHERE 3 |
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static struct { |
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int type; /* light type (0 if none) */ |
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MATREC *m; /* light material */ |
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FVECT pos; /* light position (or direction) */ |
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FVECT norm; /* flat source normal */ |
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double area; /* source area (or solid angle) */ |
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} lightrec[MAXLIGHTS]; /* light source list */ |
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static int nlights; /* number of defined lights */ |
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greg |
3.3 |
static void l_flatsrc(), l_sphsrc(), l_source(); |
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gwlarson |
3.1 |
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greg |
3.3 |
void |
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gwlarson |
3.1 |
lightinit() /* initialize lighting */ |
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{ |
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GLfloat ambv[4]; |
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register int i; |
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103 |
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if (!dolights) |
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return; |
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glPushAttrib(GL_LIGHTING_BIT); |
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if (expval <= FTINY && bright(ambval) > FTINY) |
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expval = 0.2/bright(ambval); |
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ambv[0] = expval*colval(ambval,RED); |
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ambv[1] = expval*colval(ambval,GRN); |
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ambv[2] = expval*colval(ambval,BLU); |
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ambv[3] = 1.; |
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glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambv); |
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glCallList(lightlist = newglist()); |
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rgl_checkerr("in lightinit"); |
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nlights = 0; |
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} |
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119 |
greg |
3.3 |
void |
120 |
gwlarson |
3.1 |
lightclean() /* clean up light source commands */ |
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{ |
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if ((dolights += nlights) <= 0) |
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return; |
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glPopAttrib(); |
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} |
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greg |
3.3 |
void |
129 |
gwlarson |
3.1 |
lightdefs() /* define light source list */ |
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{ |
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register int i; |
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if (!nlights) |
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return; |
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glNewList(lightlist, GL_COMPILE); |
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while (nlights--) { |
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switch (lightrec[nlights].type) { |
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case L_FLAT: |
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l_flatsrc(nlights); |
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break; |
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case L_SPHERE: |
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l_sphsrc(nlights); |
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break; |
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case L_SOURCE: |
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l_source(nlights); |
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break; |
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default: |
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error(CONSISTENCY, "botched light type in lightdefs"); |
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} |
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freemtl(lightrec[nlights].m); |
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lightrec[nlights].type = L_NONE; |
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} |
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glEndList(); |
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rgl_checkerr("defining lights"); |
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} |
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158 |
greg |
3.3 |
int |
159 |
gwlarson |
3.1 |
o_source(o) /* record a distant source */ |
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register OBJREC *o; |
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{ |
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if (!dolights || !issrcmat((MATREC *)o->os)) |
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return(0); |
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if (o->oargs.nfargs != 4) |
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objerror(o, USER, "bad # real arguments"); |
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/* record type & material */ |
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lightrec[nlights].type = L_SOURCE; |
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(lightrec[nlights].m = (MATREC *)o->os)->nlinks++; |
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/* assign direction */ |
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VCOPY(lightrec[nlights].pos, o->oargs.farg); |
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/* compute solid angle */ |
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if (o->oargs.farg[3] <= FTINY) |
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objerror(o, USER, "zero size"); |
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lightrec[nlights].area = 2.*PI*(1. - cos(PI/180./2.*o->oargs.farg[3])); |
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nlights++; dolights--; |
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return(1); |
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} |
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int |
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doflatsrc(m, pos, norm, area) /* record a flat source */ |
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MATREC *m; |
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FVECT pos, norm; |
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double area; |
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{ |
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if (!dolights || !issrcmat(m) || area <= FTINY) |
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return(0); |
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/* record type & material */ |
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lightrec[nlights].type = L_FLAT; |
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(lightrec[nlights].m = m)->nlinks++; |
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/* assign geometry */ |
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VCOPY(lightrec[nlights].pos, pos); |
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VCOPY(lightrec[nlights].norm, norm); |
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lightrec[nlights].area = area; |
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nlights++; dolights--; |
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return(1); |
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} |
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199 |
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200 |
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int |
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dosphsrc(m, pos, area) /* record a spherical source */ |
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register MATREC *m; |
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FVECT pos; |
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double area; |
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{ |
206 |
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if (!dolights || !issrcmat(m) || area <= FTINY) |
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return(0); |
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/* record type & material */ |
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lightrec[nlights].type = L_SPHERE; |
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(lightrec[nlights].m = m)->nlinks++; |
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/* assign geometry */ |
212 |
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VCOPY(lightrec[nlights].pos, pos); |
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lightrec[nlights].area = area; |
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nlights++; dolights--; |
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return(1); |
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} |
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218 |
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219 |
greg |
3.3 |
static void |
220 |
gwlarson |
3.1 |
l_source(n) /* convert a distant source */ |
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register int n; |
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{ |
223 |
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register MATREC *m = lightrec[n].m; |
224 |
gwlarson |
3.2 |
int thislight = glightid[n]; |
225 |
gwlarson |
3.1 |
GLfloat vec[4]; |
226 |
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/* assign direction */ |
227 |
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VCOPY(vec, lightrec[n].pos); |
228 |
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vec[3] = 0.; |
229 |
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glLightfv(thislight, GL_POSITION, vec); |
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/* assign color */ |
231 |
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vec[0] = expval*lightrec[n].area*colval(m->u.l.emission,RED); |
232 |
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vec[1] = expval*lightrec[n].area*colval(m->u.l.emission,GRN); |
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vec[2] = expval*lightrec[n].area*colval(m->u.l.emission,BLU); |
234 |
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vec[3] = 1.; |
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glLightfv(thislight, GL_SPECULAR, vec); |
236 |
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glLightfv(thislight, GL_DIFFUSE, vec); |
237 |
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vec[0] = vec[1] = vec[2] = 0.; vec[3] = 1.; |
238 |
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glLightfv(thislight, GL_AMBIENT, vec); |
239 |
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glEnable(thislight); |
240 |
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} |
241 |
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242 |
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243 |
greg |
3.3 |
static void |
244 |
gwlarson |
3.1 |
l_flatsrc(n) /* convert a flat source */ |
245 |
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register int n; |
246 |
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{ |
247 |
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GLfloat vec[4]; |
248 |
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register MATREC *m = lightrec[n].m; |
249 |
gwlarson |
3.2 |
int thislight = glightid[n]; |
250 |
gwlarson |
3.1 |
/* assign position */ |
251 |
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VCOPY(vec, lightrec[n].pos); vec[3] = 1.; |
252 |
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glLightfv(thislight, GL_POSITION, vec); |
253 |
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/* assign color */ |
254 |
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vec[0] = expval*lightrec[n].area*colval(m->u.l.emission,RED); |
255 |
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vec[1] = expval*lightrec[n].area*colval(m->u.l.emission,GRN); |
256 |
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vec[2] = expval*lightrec[n].area*colval(m->u.l.emission,BLU); |
257 |
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vec[3] = 1.; |
258 |
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glLightfv(thislight, GL_SPECULAR, vec); |
259 |
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glLightfv(thislight, GL_DIFFUSE, vec); |
260 |
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vec[0] = vec[1] = vec[2] = 0.; vec[3] = 1.; |
261 |
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glLightfv(thislight, GL_AMBIENT, vec); |
262 |
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glLightf(thislight, GL_SPOT_EXPONENT, 1.); |
263 |
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glLightf(thislight, GL_CONSTANT_ATTENUATION, 0.); |
264 |
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glLightf(thislight, GL_LINEAR_ATTENUATION, 0.); |
265 |
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glLightf(thislight, GL_QUADRATIC_ATTENUATION, 1.); |
266 |
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if (m->type == MAT_SPOT && m->u.l.spotang < 90.) { |
267 |
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glLightf(thislight, GL_SPOT_CUTOFF, m->u.l.spotang); |
268 |
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glLightfv(thislight, GL_SPOT_DIRECTION, m->u.l.spotdir); |
269 |
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} else { |
270 |
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glLightf(thislight, GL_SPOT_CUTOFF, 90.); |
271 |
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VCOPY(vec, lightrec[n].norm); |
272 |
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glLightfv(thislight, GL_SPOT_DIRECTION, vec); |
273 |
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} |
274 |
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glEnable(thislight); |
275 |
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} |
276 |
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277 |
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278 |
greg |
3.3 |
static void |
279 |
gwlarson |
3.1 |
l_sphsrc(n) /* convert a spherical source */ |
280 |
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register int n; |
281 |
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{ |
282 |
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GLfloat vec[4]; |
283 |
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register MATREC *m = lightrec[n].m; |
284 |
gwlarson |
3.2 |
int thislight = glightid[n]; |
285 |
gwlarson |
3.1 |
/* assign position */ |
286 |
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VCOPY(vec, lightrec[n].pos); vec[3] = 1.; |
287 |
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glLightfv(thislight, GL_POSITION, vec); |
288 |
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/* assign color */ |
289 |
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vec[0] = expval*lightrec[n].area*colval(m->u.l.emission,RED); |
290 |
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vec[1] = expval*lightrec[n].area*colval(m->u.l.emission,GRN); |
291 |
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vec[2] = expval*lightrec[n].area*colval(m->u.l.emission,BLU); |
292 |
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vec[3] = 1.; |
293 |
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glLightfv(thislight, GL_SPECULAR, vec); |
294 |
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glLightfv(thislight, GL_DIFFUSE, vec); |
295 |
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vec[0] = vec[1] = vec[2] = 0.; vec[3] = 1.; |
296 |
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glLightfv(thislight, GL_AMBIENT, vec); |
297 |
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glLightf(thislight, GL_SPOT_EXPONENT, 0.); |
298 |
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glLightf(thislight, GL_CONSTANT_ATTENUATION, 0.); |
299 |
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glLightf(thislight, GL_LINEAR_ATTENUATION, 0.); |
300 |
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glLightf(thislight, GL_QUADRATIC_ATTENUATION, 1.); |
301 |
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if (m->type == MAT_SPOT && m->u.l.spotang <= 90.) { |
302 |
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glLightf(thislight, GL_SPOT_CUTOFF, m->u.l.spotang); |
303 |
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glLightfv(thislight, GL_SPOT_DIRECTION, m->u.l.spotdir); |
304 |
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} else |
305 |
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glLightf(thislight, GL_SPOT_CUTOFF, 180.); |
306 |
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glEnable(thislight); |
307 |
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} |