render3d.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   render3d.c                                         :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: hgrissen <hgrissen@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/02/07 12:36:01 by hgrissen          #+#    #+#             */
/*   Updated: 2021/02/15 16:00:19 by hgrissen         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "cub3d.h"

unsigned int	shadow(unsigned int color, int col)
{
	unsigned int	r;
	unsigned int	g;
	unsigned int	b;
	float			fact;
	unsigned int	dark;

	if (BON == 0)
		return (color);
	col = 0;
	fact = LGHT / g_col.perp_dist;
	if (fact > 1)
		return (color);
	r = (((color >> 16) & 0xFF)) * fact;
	g = (((color >> 8) & 0xFF)) * fact;
	b = ((color) & (0xFF)) * fact;
	dark = rgb_to_int(0, r, g, b);
	if (dark > color)
		dark = color;
	return (dark);
}

int				shadedcolor(int r, int g, int b, float percent)
{
	r = clamp_clr(r - floorf(r * percent));
	g = clamp_clr(g - floorf(g * percent));
	b = clamp_clr(b - floorf(b * percent));
	return ((r & 0xff) << 16) + ((g & 0xff) << 8) + (b & 0xff);
}

int				shade(int i, char x)
{
	int			crouch;
	float		percent;

	crouch = g_p.iscrouch ? CROUCH : 0;
	if (x == 'c')
	{
		if (BON == 0)
			return (rgb_to_int(00, g_prm.cr, g_prm.cg, g_prm.cb));
		percent = ((float)i + g_p.crouch) / (g_prm.h / 2);
		return (shadedcolor(g_prm.cr, g_prm.cg, g_prm.cb, percent));
	}
	else
	{
		if (BON == 0)
			return (rgb_to_int(00, g_prm.fr, g_prm.fg, g_prm.fb));
		percent = ((float)i + g_p.crouch) - (g_prm.h / 2);
		percent /= (g_prm.h - (g_prm.h / 2));
		percent = 1 - percent;
		return (shadedcolor(g_prm.fr, g_prm.fg, g_prm.fb, percent));
	}
}

void			render_flr_cei(void)
{
	int i;
	int j;
	int fc;
	int cc;
	int crouch;

	crouch = g_p.crouch * 2;
	i = -1;
	while (++i < g_prm.h)
	{
		fc = shade(i, 'f');
		cc = shade(i, 'c');
		j = -1;
		while (++j < g_prm.w)
		{
			if (i > (g_prm.h - crouch) / 2)
				my_mlx_pixel_put(&g_img, j, i, fc);
			else
				my_mlx_pixel_put(&g_img, j, i, cc);
		}
	}
}