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/* |
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Teem: Tools to process and visualize scientific data and images . |
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Copyright (C) 2013, 2012, 2011, 2010, 2009 University of Chicago |
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Copyright (C) 2008, 2007, 2006, 2005 Gordon Kindlmann |
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Copyright (C) 2004, 2003, 2002, 2001, 2000, 1999, 1998 University of Utah |
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public License |
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(LGPL) as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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The terms of redistributing and/or modifying this software also |
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include exceptions to the LGPL that facilitate static linking. |
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public License |
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along with this library; if not, write to Free Software Foundation, Inc., |
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "limn.h" |
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/* |
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******** limnLightSet() |
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** |
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** turns on a light |
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** |
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*/ |
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void |
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limnLightSet(limnLight *lit, int which, int vsp, |
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float r, float g, float b, |
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float x, float y, float z) { |
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if (lit && AIR_IN_CL(0, which, LIMN_LIGHT_NUM-1)) { |
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lit->on[which] = 1; |
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lit->vsp[which] = vsp; |
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ELL_4V_SET(lit->col[which], r, g, b, 1.0); |
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ELL_4V_SET(lit->_dir[which], x, y, z, 0.0); |
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} |
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} |
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/* |
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******** limnLightAmbientSet() |
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** |
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** sets the ambient light color |
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*/ |
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void |
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limnLightAmbientSet(limnLight *lit, float r, float g, float b) { |
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if (lit) { |
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ELL_4V_SET(lit->amb, r, g, b, 1.0); |
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} |
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} |
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/* |
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******** limnLightUpdate() |
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** |
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** copies information from the _dir vectors to the dir vectors. This |
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** needs to be called even if there are no viewspace lights, so that |
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** the dir vectors are set and normalized. If there are no viewspace |
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** lights, "cam" can actually be passed as NULL, but don't get carried |
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** away... |
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** |
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** returns 1 if there was a problem in the camera, otherwise 0. |
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*/ |
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int |
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limnLightUpdate(limnLight *lit, limnCamera *cam) { |
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static const char me[]="limnLightUpdate"; |
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double dir[3], _dir[3], uvn[9]={0,0,0,0,0,0,0,0,0}, norm; |
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int i; |
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if (cam) { |
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if (limnCameraUpdate(cam)) { |
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biffAddf(LIMN, "%s: trouble in camera", me); |
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return 1; |
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} |
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ELL_34M_EXTRACT(uvn, cam->V2W); |
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} |
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for (i=0; i<LIMN_LIGHT_NUM; i++) { |
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ELL_3V_COPY(_dir, lit->_dir[i]); |
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if (cam && lit->vsp[i]) { |
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ELL_3MV_MUL(dir, uvn, _dir); |
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} else { |
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ELL_3V_COPY(dir, _dir); |
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} |
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ELL_3V_NORM(dir, dir, norm); |
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ELL_4V_SET_TT(lit->dir[i], float, dir[0], dir[1], dir[2], 0.0); |
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} |
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return 0; |
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} |
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/* |
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******** limnLightSwitch |
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** |
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** can toggle a light on/off |
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** |
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** returns 1 on error, 0 if okay |
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*/ |
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void |
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limnLightSwitch(limnLight *lit, int which, int on) { |
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if (lit && AIR_IN_CL(0, which, LIMN_LIGHT_NUM-1)) { |
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lit->on[which] = on; |
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} |
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} |
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void |
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limnLightReset(limnLight *lit) { |
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int i; |
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if (lit) { |
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ELL_4V_SET(lit->amb, 0, 0, 0, 1); |
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for (i=0; i<LIMN_LIGHT_NUM; i++) { |
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ELL_4V_SET(lit->_dir[i], 0, 0, 0, 0); |
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ELL_4V_SET(lit->dir[i], 0, 0, 0, 0); |
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ELL_4V_SET(lit->col[i], 0, 0, 0, 1); |
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lit->on[i] = AIR_FALSE; |
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lit->vsp[i] = AIR_FALSE; |
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} |
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} |
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} |