void julia2(t_iter iter, t_zoom *zoom, t_param *param, t_pnt *pnt)
{
int i;
i = 0;
while ((iter.z_r * iter.z_r + iter.z_i * iter.z_i) < 4 &&
i < zoom->iter_max)
{
iter.tmp = iter.z_r;
iter.z_r = iter.z_r * iter.z_r - iter.z_i * iter.z_i +
iter.c_r;
iter.z_i = 2 * iter.z_i * iter.tmp + iter.c_i;
i++;
}
if (i == zoom->iter_max)
draw_px(pnt->x, pnt->y, 0xFFFFFF, param);
else
draw_px(pnt->x, pnt->y, (i * 255 / zoom->iter_max) << param->color,
param);
}
static void julia_start(t_context *c, t_mandelbrot *m,
const int startx, const int endx)
{
t_point px;
const int *colors = c->colormap;
px.x = startx;
while (px.x-- > endx)
{
m->z_re = (t_fracval)(px.x * m->zoom) + m->x1;
px.y = c->x->height;
while (px.y--)
{
m->z_im = (t_fracval)(px.y * m->zoom) + m->y1;
draw_px(c->x, &px, colors[julia_core(m)]);
}
}
}
static void display_vertical_tex(t_context *c, t_ray *ray, t_line *line)
{
const double h = (double)c->x->height;
t_point px;
t_point tpx;
t_texture *tex;
unsigned int color;
tex = &c->map.tex[texture_id(c, ray)];
tpx.x = texture_get_x(c, ray, tex);
px = line->start;
while (px.y < line->end.y)
{
tpx.y = (int)(((double)(px.y * 2) - h + ray->h) *
(((double)tex->height / 2.0) / ray->h));
if (tpx.y >= 0)
{
color = texture_px(tex, tpx);
if ((ray->side == 1) && (tex->id >= 2))
color = (color >> 1) & 8355711;
draw_px(c->x, &px, color);
}
px.y++;
}
