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/*
* 3D utils.
*
* Authors:
* Jean-Rene Reinhard <jr@komite.net>
*
* Copyright (C) 2007 authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include <glib/gmessages.h>
#include "libnr/nr-pixblock.h"
#include "display/nr-3dutils.h"
#include <cmath>
namespace NR {
#define BEGIN 0 // TOP or LEFT
#define MIDDLE 1
#define END 2 // BOTTOM or RIGHT
#define START(v) ((v)==BEGIN? 1 : 0)
#define FINISH(v) ((v)==END? 1 : 2)
signed char K_X[3][3][3][3] = {
//K_X[TOP]
{
//K_X[TOP][LEFT]
{
{ 0, 0, 0},
{ 0, -2, 2},
{ 0, -1, 1}
},
{
{ 0, 0, 0},
{-2, 0, 2},
{-1, 0, 1}
},
{
{ 0, 0, 0},
{-2, 2, 0},
{-1, 1, 0}
}
},
//K_X[MIDDLE]
{
//K_X[MIDDLE][LEFT]
{
{ 0, -1, 1},
{ 0, -2, 2},
{ 0, -1, 1}
},
{
{-1, 0, 1},
{-2, 0, 2},
{-1, 0, 1}
},
{
{-1, 1, 0},
{-2, 2, 0},
{-1, 1, 0}
}
},
//K_X[BOTTOM]
{
//K_X[BOTTOM][LEFT]
{
{ 0, -1, 1},
{ 0, -2, 2},
{ 0, 0, 0}
},
{
{-1, 0, 1},
{-2, 0, 2},
{ 0, 0, 0}
},
{
{-1, 1, 0},
{-2, 2, 0},
{ 0, 0, 0}
}
}
};
//K_Y is obtained by transposing K_X globally and each of its components
gdouble FACTOR_X[3][3] = {
{2./3, 1./3, 2./3},
{1./2, 1./4, 1./2},
{2./3, 1./3, 2./3}
};
//FACTOR_Y is obtained by transposing FACTOR_X
inline
int get_carac(int i, int len, int delta) {
if (i < delta)
return BEGIN;
else if (i > len - 1 - delta)
return END;
else
return MIDDLE;
}
//assumes in is RGBA
//should be made more resistant
void compute_surface_normal(Fvector &N, gdouble ss, NRPixBlock *in, int i, int j, int dx, int dy) {
int w = in->area.x1 - in->area.x0;
int h = in->area.y1 - in->area.y0;
int k, l, alpha_idx, alpha_idx_y;
int x_carac, y_carac;
gdouble alpha;
gdouble accu_x;
gdouble accu_y;
unsigned char *data = NR_PIXBLOCK_PX (in);
g_assert(NR_PIXBLOCK_BPP(in) == 4);
x_carac = get_carac(j, w, dx); //LEFT, MIDDLE or RIGHT
y_carac = get_carac(i, h, dy); //TOP, MIDDLE or BOTTOM
alpha_idx = 4*(i*w + j);
accu_x = 0;
accu_y = 0;
for (k = START(y_carac); k <= FINISH(y_carac); k++) {
alpha_idx_y = alpha_idx + 4*(k-1)*dy*w;
for (l = START(x_carac); l <= FINISH(x_carac); l++) {
alpha = (data + alpha_idx_y + 4*dx*(l-1))[3];
accu_x += K_X[y_carac][x_carac][k][l] * alpha / 255;
accu_y += K_X[x_carac][y_carac][l][k] * alpha / 255;
}
}
N[X_3D] = -1 * ss * FACTOR_X[y_carac][x_carac] * accu_x / dx;
N[Y_3D] = -1 * ss * FACTOR_X[x_carac][y_carac] * accu_y / dy;
N[Z_3D] = 1;
normalize_vector(N);
//std::cout << "(" << N[X_3D] << ", " << N[Y_3D] << ", " << N[Z_3D] << ")" << std::endl;
}
void convert_coord(gdouble &x, gdouble &y, gdouble &z, Geom::Matrix const &trans) {
Point p = Point(x, y);
p *= trans;
x = p[Geom::X];
y = p[Geom::Y];
z *= trans[0];
}
gdouble norm(const Fvector &v) {
return sqrt(v[X_3D]*v[X_3D] + v[Y_3D]*v[Y_3D] + v[Z_3D]*v[Z_3D]);
}
void normalize_vector(Fvector &v) {
gdouble nv = norm(v);
//TODO test nv == 0
for (int j = 0; j < 3; j++) {
v[j] /= nv;
}
}
gdouble scalar_product(const Fvector &a, const Fvector &b) {
return a[X_3D] * b[X_3D] +
a[Y_3D] * b[Y_3D] +
a[Z_3D] * b[Z_3D];
}
void normalized_sum(Fvector &r, const Fvector &a, const Fvector &b) {
r[X_3D] = a[X_3D] + b[X_3D];
r[Y_3D] = a[Y_3D] + b[Y_3D];
r[Z_3D] = a[Z_3D] + b[Z_3D];
normalize_vector(r);
}
}/* 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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