1 |
|
|
/* |
2 |
|
|
Teem: Tools to process and visualize scientific data and images . |
3 |
|
|
Copyright (C) 2013, 2012, 2011, 2010, 2009 University of Chicago |
4 |
|
|
Copyright (C) 2008, 2007, 2006, 2005 Gordon Kindlmann |
5 |
|
|
Copyright (C) 2004, 2003, 2002, 2001, 2000, 1999, 1998 University of Utah |
6 |
|
|
|
7 |
|
|
This library is free software; you can redistribute it and/or |
8 |
|
|
modify it under the terms of the GNU Lesser General Public License |
9 |
|
|
(LGPL) as published by the Free Software Foundation; either |
10 |
|
|
version 2.1 of the License, or (at your option) any later version. |
11 |
|
|
The terms of redistributing and/or modifying this software also |
12 |
|
|
include exceptions to the LGPL that facilitate static linking. |
13 |
|
|
|
14 |
|
|
This library is distributed in the hope that it will be useful, |
15 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 |
|
|
Lesser General Public License for more details. |
18 |
|
|
|
19 |
|
|
You should have received a copy of the GNU Lesser General Public License |
20 |
|
|
along with this library; if not, write to Free Software Foundation, Inc., |
21 |
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
22 |
|
|
*/ |
23 |
|
|
|
24 |
|
|
#include "echo.h" |
25 |
|
|
#include "privateEcho.h" |
26 |
|
|
|
27 |
|
|
/* |
28 |
|
|
******* echoLightPosition() |
29 |
|
|
** |
30 |
|
|
** sets "pos" to xyz position for current sample of given light |
31 |
|
|
*/ |
32 |
|
|
void |
33 |
|
|
echoLightPosition(echoPos_t pos[3], echoObject *light, |
34 |
|
|
echoThreadState *tstate) { |
35 |
|
|
char me[]="echoLightPos"; |
36 |
|
|
echoPos_t x, y; |
37 |
|
|
echoRectangle *rectLight; |
38 |
|
|
|
39 |
|
|
x = tstate->jitt[0 + 2*echoJittableLight] + 0.5; |
40 |
|
|
y = tstate->jitt[1 + 2*echoJittableLight] + 0.5; |
41 |
|
|
switch(light->type) { |
42 |
|
|
case echoTypeRectangle: |
43 |
|
|
rectLight = RECTANGLE(light); |
44 |
|
|
ELL_3V_SCALE_ADD3(pos, 1, rectLight->origin, |
45 |
|
|
x, rectLight->edge0, |
46 |
|
|
y, rectLight->edge1); |
47 |
|
|
break; |
48 |
|
|
default: |
49 |
|
|
fprintf(stderr, "%s: currently only support echoTypeRectangle lights", me); |
50 |
|
|
break; |
51 |
|
|
} |
52 |
|
|
return; |
53 |
|
|
} |
54 |
|
|
|
55 |
|
|
/* |
56 |
|
|
******* echoLightColor() |
57 |
|
|
** |
58 |
|
|
** sets "col" to RGB color for current sample of given light, which |
59 |
|
|
** is at distance Ldist. Knowing distance allows computation of the |
60 |
|
|
** inverse square fall-off of light intensity |
61 |
|
|
*/ |
62 |
|
|
void |
63 |
|
|
echoLightColor(echoCol_t rgb[3], echoPos_t Ldist, |
64 |
|
|
echoObject *light, echoRTParm *parm, echoThreadState *tstate) { |
65 |
|
|
echoCol_t rgba[4], falloff; |
66 |
|
|
echoPos_t x, y; |
67 |
|
|
|
68 |
|
|
x = tstate->jitt[0 + 2*echoJittableLight] + 0.5; |
69 |
|
|
y = tstate->jitt[1 + 2*echoJittableLight] + 0.5; |
70 |
|
|
if (light->ntext) { |
71 |
|
|
echoTextureLookup(rgba, light->ntext, x, y, parm); |
72 |
|
|
ELL_3V_COPY(rgb, rgba); |
73 |
|
|
} else { |
74 |
|
|
ELL_3V_COPY(rgb, light->rgba); |
75 |
|
|
} |
76 |
|
|
ELL_3V_SCALE(rgb, light->mat[echoMatterLightPower], rgb); |
77 |
|
|
if (light->mat[echoMatterLightUnit]) { |
78 |
|
|
falloff = AIR_CAST(echoCol_t, light->mat[echoMatterLightUnit]/Ldist); |
79 |
|
|
falloff *= falloff; |
80 |
|
|
ELL_3V_SCALE(rgb, falloff, rgb); |
81 |
|
|
} |
82 |
|
|
|
83 |
|
|
return; |
84 |
|
|
} |
85 |
|
|
|
86 |
|
|
void |
87 |
|
|
echoEnvmapLookup(echoCol_t rgb[3], echoPos_t norm[3], Nrrd *envmap) { |
88 |
|
|
int qn; |
89 |
|
|
float *data; |
90 |
|
|
|
91 |
|
|
#if ECHO_POS_FLOAT |
92 |
|
|
qn = limnVtoQN_f[limnQN16octa](norm); |
93 |
|
|
#else |
94 |
|
|
qn = limnVtoQN_d[limnQN16octa](norm); |
95 |
|
|
#endif |
96 |
|
|
data = (float*)(envmap->data) + 3*qn; |
97 |
|
|
ELL_3V_COPY(rgb, data); |
98 |
|
|
} |
99 |
|
|
|