/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_draw_sprite_extra.c                             :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rbousset <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/02/24 20:22:45 by rbousset          #+#    #+#             */
/*   Updated: 2020/03/09 18:56:01 by rbousset         ###   ########lyon.fr   */
/*                                                                            */
/* ************************************************************************** */

#include <cub3d.h>
#include <stdint.h>
#include <stdlib.h>

void
	ft_sprite_h_w(t_cub *cl, t_sprite *sprite)
{
	sprite->spriteheight = abs((int)(cl->wlist.y_size / (sprite->transformy)));
	sprite->drawstarty = -sprite->spriteheight / 2 + cl->wlist.y_size / 2;
	if (sprite->drawstarty < 0)
		sprite->drawstarty = 0;
	sprite->drawendy = sprite->spriteheight / 2 + cl->wlist.y_size / 2;
	if (sprite->drawendy >= (int)cl->wlist.y_size)
		sprite->drawendy = cl->wlist.y_size - 1;
	sprite->spritewidth = abs((int)(cl->wlist.x_size / (sprite->transformy)));
	sprite->drawstartx = -sprite->spritewidth / 2 + sprite->spritescreenx;
	if (sprite->drawstartx < 0)
		sprite->drawstartx = 0;
	sprite->drawendx = sprite->spritewidth / 2 + sprite->spritescreenx;
	if (sprite->drawendx >= (int)cl->wlist.x_size)
		sprite->drawendx = cl->wlist.x_size - 1;
}


static void
	ft_init_sprite(t_cub *cl, t_sprite *sprite)
{
	sprite->invdet = 1.0 / (cl->plist.plane_x * cl->plist.dir_y
		- cl->plist.dir_x * cl->plist.plane_y);
	sprite->transformx = sprite->invdet * (cl->plist.dir_y * sprite->spritex
		- cl->plist.dir_x * sprite->spritey);
	sprite->transformy = sprite->invdet * (-cl->plist.plane_y * sprite->spritex
		+ cl->plist.plane_x * sprite->spritey);
	sprite->spritescreenx = (int)(cl->wlist.x_size / 2) *
		(1 + sprite->transformx / sprite->transformy);
}

#include <libft.h>
void
	ft_calc_sprite(t_cub *cl)
{
	t_sprite	sprite;
	int16_t		i;
	int8_t		j;

	i = -1;
	j = -1;
	ft_sort_sprites(cl, -1, -1);
	while (++j < cl->big_t_val)
	{
		sprite = cl->sprites[(int8_t)cl->big_t[j][2]][(int32_t)cl->big_t[j][3]];
		sprite.current_sprite = (int8_t)cl->big_t[j][1];
		sprite.spritey = sprite.s_pos_x - (cl->plist.pos_x - 0.5);
		sprite.spritex = sprite.s_pos_y - (cl->plist.pos_y - 0.5);
		ft_init_sprite(cl, &sprite);
		ft_sprite_h_w(cl, &sprite);
		ft_draw_sprite(cl, &sprite);
		i = -1;
	}
}