/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   set_camera.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: gbrochar <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/02/07 15:12:51 by gbrochar          #+#    #+#             */
/*   Updated: 2019/02/22 17:28:43 by gbrochar         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "rtv1.h"

void						set_orientation(t_camera *camera)
{
	camera->uv = vec(0, 1, 0);
	camera->rv = cross_product(camera->uv, camera->d);
	normalize(&camera->rv);
	camera->uv = cross_product(camera->d, camera->rv);
	camera->ul = vec_add(camera->o,
			vec_add(vec_mul(camera->d, camera->dist),
				vec_sub(vec_mul(camera->uv, (camera->height / 2)),
					vec_mul(camera->rv, (camera->width / 2)))));
}

void						init_camera(t_camera *camera)
{
	if (WINX > WINY)
	{
		camera->height = 1 / ZOOM;
		camera->width = WINX / WINY * (1 / ZOOM);
	}
	else
	{
		camera->width = 1 / ZOOM;
		camera->height = WINX / WINY * (1 / ZOOM);
	}
	camera->dist = VP_DIST;
	camera->o = vec(0, 0, 0);
	camera->d = vec(0, 0, -1);
	set_orientation(camera);
}

int							set_camera(char **data, t_env *e)
{
	int						i;

	i = 0;
	ft_putendl("Setting camera");
	while (data[i] && i < 7)
		++i;
	if (i > 3)
		e->camera.o = vec(ft_atof(data[1]), ft_atof(data[2]), ft_atof(data[3]));
	if (i > 6)
	{
		e->camera.d = vec(ft_atof(data[4]), ft_atof(data[5]), ft_atof(data[6]));
		e->camera.d = vec_sub(e->camera.d, e->camera.o);
		if (FAILURE == check_direction(e->camera.d))
			return (FAILURE);
		normalize(&e->camera.d);
		if ((e->camera.d.y + E > 1 && e->camera.d.y - E < 1)
				|| (e->camera.d.y + E > -1 && e->camera.d.y - E < -1))
			e->camera.d.x = 0.01;
		normalize(&e->camera.d);
		set_orientation(&e->camera);
	}
	return (SUCCESS);
}