1 #define __NR_LIGHT_CPP__
3 /*
4 * Light rendering helpers
5 *
6 * Author:
7 * Jean-Rene Reinhard <jr@komite.net>
8 *
9 * Copyright (C) 2006 Jean-Rene Reinhard
10 *
11 * Released under GNU GPL, read the file 'COPYING' for more information
12 */
14 #include <cmath>
16 #include "libnr/nr-pixops.h"
17 #include "display/nr-light.h"
18 #include "display/nr-3dutils.h"
19 #include "filters/distantlight.h"
20 #include "filters/pointlight.h"
21 #include "filters/spotlight.h"
23 namespace Inkscape {
24 namespace Filters {
26 DistantLight::DistantLight(SPFeDistantLight *light, guint32 lighting_color) {
27 color = lighting_color;
28 azimuth = M_PI / 180 * light->azimuth;
29 elevation = M_PI / 180 * light->elevation;
30 }
32 DistantLight::~DistantLight() {}
34 void DistantLight::light_vector(NR::Fvector &v) {
35 v[X_3D] = std::cos(azimuth)*std::cos(elevation);
36 v[Y_3D] = std::sin(azimuth)*std::cos(elevation);
37 v[Z_3D] = std::sin(elevation);
38 }
40 void DistantLight::light_components(NR::Fvector &lc) {
41 lc[LIGHT_RED] = NR_RGBA32_R(color);
42 lc[LIGHT_GREEN] = NR_RGBA32_G(color);
43 lc[LIGHT_BLUE] = NR_RGBA32_B(color);
44 }
46 PointLight::PointLight(SPFePointLight *light, guint32 lighting_color, const Geom::Matrix &trans) {
47 color = lighting_color;
48 l_x = light->x;
49 l_y = light->y;
50 l_z = light->z;
51 NR::convert_coord(l_x, l_y, l_z, trans);
52 }
54 PointLight::~PointLight() {}
56 void PointLight::light_vector(NR::Fvector &v, gdouble x, gdouble y, gdouble z) {
57 v[X_3D] = l_x - x;
58 v[Y_3D] = l_y - y;
59 v[Z_3D] = l_z - z;
60 NR::normalize_vector(v);
61 }
63 void PointLight::light_components(NR::Fvector &lc) {
64 lc[LIGHT_RED] = NR_RGBA32_R(color);
65 lc[LIGHT_GREEN] = NR_RGBA32_G(color);
66 lc[LIGHT_BLUE] = NR_RGBA32_B(color);
67 }
69 SpotLight::SpotLight(SPFeSpotLight *light, guint32 lighting_color, const Geom::Matrix &trans) {
70 gdouble p_x, p_y, p_z;
71 color = lighting_color;
72 l_x = light->x;
73 l_y = light->y;
74 l_z = light->z;
75 p_x = light->pointsAtX;
76 p_y = light->pointsAtY;
77 p_z = light->pointsAtZ;
78 cos_lca = std::cos(M_PI / 180 * light->limitingConeAngle);
79 speExp = light->specularExponent;
80 NR::convert_coord(l_x, l_y, l_z, trans);
81 NR::convert_coord(p_x, p_y, p_z, trans);
82 S[X_3D] = p_x - l_x;
83 S[Y_3D] = p_y - l_y;
84 S[Z_3D] = p_z - l_z;
85 NR::normalize_vector(S);
87 }
89 SpotLight::~SpotLight() {}
91 void SpotLight::light_vector(NR::Fvector &v, gdouble x, gdouble y, gdouble z) {
92 v[X_3D] = l_x - x;
93 v[Y_3D] = l_y - y;
94 v[Z_3D] = l_z - z;
95 NR::normalize_vector(v);
96 }
98 void SpotLight::light_components(NR::Fvector &lc, const NR::Fvector &L) {
99 gdouble spmod = (-1) * NR::scalar_product(L, S);
100 if (spmod <= cos_lca)
101 spmod = 0;
102 else
103 spmod = std::pow(spmod, speExp);
104 lc[LIGHT_RED] = spmod * NR_RGBA32_R(color);
105 lc[LIGHT_GREEN] = spmod * NR_RGBA32_G(color);
106 lc[LIGHT_BLUE] = spmod * NR_RGBA32_B(color);
107 }
109 } /* namespace Filters */
110 } /* namespace Inkscape */
112 /*
113 Local Variables:
114 mode:c++
115 c-file-style:"stroustrup"
116 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
117 indent-tabs-mode:nil
118 fill-column:99
119 End:
120 */
121 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :