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#define __NR_LIGHT_CPP__
/*
* Light rendering helpers
*
* Author:
* Jean-Rene Reinhard <jr@komite.net>
*
* Copyright (C) 2006 Jean-Rene Reinhard
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include <cmath>
#include "libnr/nr-pixops.h"
#include "display/nr-light.h"
#include "display/nr-3dutils.h"
#include "sp-fedistantlight.h"
#include "sp-fepointlight.h"
#include "sp-fespotlight.h"
namespace NR {
DistantLight::DistantLight(SPFeDistantLight *light, guint32 lighting_color) {
color = lighting_color;
azimuth = M_PI / 180 * light->azimuth;
elevation = M_PI / 180 * light->elevation;
}
DistantLight::~DistantLight() {}
void DistantLight::light_vector(Fvector &v) {
v[X_3D] = std::cos(azimuth)*std::cos(elevation);
v[Y_3D] = std::sin(azimuth)*std::cos(elevation);
v[Z_3D] = std::sin(elevation);
}
void DistantLight::light_components(Fvector &lc) {
lc[LIGHT_RED] = NR_RGBA32_R(color);
lc[LIGHT_GREEN] = NR_RGBA32_G(color);
lc[LIGHT_BLUE] = NR_RGBA32_B(color);
}
PointLight::PointLight(SPFePointLight *light, guint32 lighting_color, const Matrix &trans) {
color = lighting_color;
l_x = light->x;
l_y = light->y;
l_z = light->z;
convert_coord(l_x, l_y, l_z, trans);
}
PointLight::~PointLight() {}
void PointLight::light_vector(Fvector &v, gdouble x, gdouble y, gdouble z) {
v[X_3D] = l_x - x;
v[Y_3D] = l_y - y;
v[Z_3D] = l_z - z;
normalize_vector(v);
}
void PointLight::light_components(Fvector &lc) {
lc[LIGHT_RED] = NR_RGBA32_R(color);
lc[LIGHT_GREEN] = NR_RGBA32_G(color);
lc[LIGHT_BLUE] = NR_RGBA32_B(color);
}
SpotLight::SpotLight(SPFeSpotLight *light, guint32 lighting_color, const Matrix &trans) {
gdouble p_x, p_y, p_z;
color = lighting_color;
l_x = light->x;
l_y = light->y;
l_z = light->z;
p_x = light->pointsAtX;
p_y = light->pointsAtY;
p_z = light->pointsAtZ;
cos_lca = std::cos(M_PI / 180 * light->limitingConeAngle);
speExp = light->specularExponent;
convert_coord(l_x, l_y, l_z, trans);
convert_coord(p_x, p_y, p_z, trans);
S[X_3D] = p_x - l_x;
S[Y_3D] = p_y - l_y;
S[Z_3D] = p_z - l_z;
normalize_vector(S);
}
SpotLight::~SpotLight() {}
void SpotLight::light_vector(Fvector &v, gdouble x, gdouble y, gdouble z) {
v[X_3D] = l_x - x;
v[Y_3D] = l_y - y;
v[Z_3D] = l_z - z;
normalize_vector(v);
}
void SpotLight::light_components(Fvector &lc, const Fvector &L) {
gdouble spmod = (-1) * scalar_product(L, S);
if (spmod <= cos_lca)
spmod = 0;
else
spmod = std::pow(spmod, speExp);
lc[LIGHT_RED] = spmod * NR_RGBA32_R(color);
lc[LIGHT_GREEN] = spmod * NR_RGBA32_G(color);
lc[LIGHT_BLUE] = spmod * NR_RGBA32_B(color);
}
} /* namespace NR */
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :
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