/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   raytrace.c                                         :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: gbrochar <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/02/07 15:35:45 by gbrochar          #+#    #+#             */
/*   Updated: 2019/02/13 18:57:43 by gbrochar         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "rtv1.h"

t_obj_list				*intersect_ray(t_env *e, t_ray r)
{
	t_obj_list			*browser;
	t_obj_list			*closest_obj;

	closest_obj = NULL;
	browser = e->objs;
	while (browser)
	{
		browser->t = e->func.intersect_obj[browser->type](browser->obj, r);
		browser = browser->next;
	}
	browser = e->objs;
	while (browser)
	{
		if (browser->t > 0 && (!closest_obj || browser->t < closest_obj->t))
			closest_obj = browser;
		browser = browser->next;
	}
	return (closest_obj);
}

void					raytrace_pixel(t_env *e, int x, int y)
{
	t_ray				r;
	t_obj_list			*closest_object;

	r = set_ray(e, x, y);
	closest_object = intersect_ray(e, r);
	if (closest_object)
		put_pixel(e, x, y, phong(e, r, closest_object));
	else
		put_pixel(e, x, y, color(0, 0, 0));
}

void					raytrace(t_env *e)
{
	int					x;
	int					y;

	y = -1;
	while (++y < WINY)
	{
		x = -1;
		while (++x < WINX)
			raytrace_pixel(e, x, y);
	}
	mlx_put_image_to_window(e->mlx.ptr, e->mlx.win, e->mlx.img, 0, 0);
}