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box.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* box.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: snicolet <snicolet@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2016/05/23 21:03:45 by snicolet #+# #+# */
/* Updated: 2016/08/31 02:02:35 by snicolet ### ########.fr */
/* */
/* ************************************************************************** */
#include "rt.h"
#include "cube.h"
#include "mesh.h"
int cube_check(float *box, float start, float dir, double *tb)
{
double tmin;
double tmax;
tmin = (double)(box[0] - start);
tmax = (double)(box[1] - start);
if (dir != 0.0f)
{
tmin = tmin / (double)dir;
tmax = tmax / (double)dir;
if (tmin > tmax)
draw_swap(&tmin, &tmax);
}
else if ((tmin > 0.0) || (tmax < 0.0))
return (1);
else
{
tmin = (double)-INFINITY;
tmax = (double)INFINITY;
}
if ((tmin > tb[1]) || (tmax < tb[0]))
return (1);
tb[0] = fmax(tb[0], tmin);
tb[1] = fmin(tb[1], tmax);
return (0);
}
int raybox_cube_check(t_ray *r, t_box *box)
{
double tb[2];
const float rx = (float)r->dir.x;
const float ry = (float)r->dir.y;
const float rz = (float)r->dir.z;
tb[0] = (double)-INFINITY;
tb[1] = (double)INFINITY;
if (cube_check(&(box->xmin), (float)r->start.x, rx, tb))
return (0);
if (tb[1] < 0.0)
return (0);
r->lenght = (tb[0] > 0.0) ? tb[0] : tb[1];
if (cube_check(&(box->ymin), (float)r->start.y, ry, tb))
return (0);
if (tb[1] < 0.0)
return (0);
r->lenght = (tb[0] > 0.0) ? tb[0] : tb[1];
if (cube_check(&(box->zmin), (float)r->start.z, rz, tb))
return (0);
if (tb[1] < 0.0)
return (0);
r->lenght = (tb[0] > 0.0) ? tb[0] : tb[1];
return (1);
}
static void rt_box_update_triangle(t_obj *obj)
{
const t_triangle *tri = obj->content;
t_v4d v[3];
int p;
v[0] = geo_addv4(tri->v3.pos, obj->trans.w);
v[1] = geo_addv4(tri->v2.pos, obj->trans.w);
v[2] = geo_addv4(tri->v1.pos, obj->trans.w);
obj->hitbox = (t_box){(float)v[2].x, (float)v[2].x,
(float)v[2].y, (float)v[2].y, (float)v[2].z, (float)v[2].z};
p = 2;
while (p--)
{
if ((float)v[p].x < obj->hitbox.xmin)
obj->hitbox.xmin = (float)v[p].x;
if ((float)v[p].y < obj->hitbox.ymin)
obj->hitbox.ymin = (float)v[p].y;
if ((float)v[p].z < obj->hitbox.zmin)
obj->hitbox.zmin = (float)v[p].z;
if ((float)v[p].x > obj->hitbox.xmax)
obj->hitbox.xmax = (float)v[p].x;
if ((float)v[p].y > obj->hitbox.ymax)
obj->hitbox.ymax = (float)v[p].y;
if ((float)v[p].z > obj->hitbox.zmax)
obj->hitbox.zmax = (float)v[p].z;
}
}
static void rt_box_update_cone(t_obj *obj, const t_v4f *p)
{
t_v4f r;
r.x = (float)(((t_cone *)(obj->content))->angle.w);
r.y = ((t_cone *)(obj->content))->size;
obj->hitbox = (t_box){p->x - r.x * r.y, p->x + r.x * r.y, p->y - r.y,
p->y, p->z - r.x * r.y, p->z + r.x * r.y};
}
void rt_box_update(t_obj *obj)
{
const t_v4f p = draw_convert_v4d_to_v4f(obj->trans.w);
t_v4f r;
if (obj->type == CUBE)
{
r.x = ((t_cube*)(obj->content))->size / 2.0f;
obj->hitbox = (t_box){p.x - r.x, p.x + r.x, p.y - r.x, p.y + r.x,
p.z - r.x, p.z + r.x};
}
else if (obj->type == SPHERE)
{
r.x = ((t_sphere*)(obj->content))->radius;
obj->hitbox = (t_box){p.x - r.x, p.x + r.x, p.y - r.x, p.y + r.x,
p.z - r.x, p.z + r.x};
}
else if (obj->type == CONE)
rt_box_update_cone(obj, &p);
else if (obj->type == TRIANGLE)
rt_box_update_triangle(obj);
else
obj->hitbox = (t_box){0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
}